Japanese Architectural Standard Specification JASS 6

JapaneseArchitecturalStandardSpecificationJASS 6 (1996)Structural SteelworkSpecificationforBuilding Construction

OUTLINES OF IMPORTANT CHANGESFROM PREVIOUS EDITION

Architectural Institute of Japan

The English version of JASS 6 now available in a book format is the translation ofJASS 6, Fifth Edition published in 1993. As JASS 6, Sixth Edition in Japanese waspublished in 1996, it would have been ideal to publish the English version as beforecorresponding to the new edition. This booklet however only presents outlines of theimportant changes in the Sixth Edition of JASS 6. The readers are thus required toprepare the English version of JASS 6, Fifth Edition to follow the description of thisbooklet.Moreover a detailed description of the content of the revisions would be complex anddifficult to read, this booklet has been prepared to present the gist of importantchanges. It is recommended that the Japanese original shall be referred to for detailsof the revisions. The Sixth Edition includes small changes to the Appendix of theFifth Edition, but these are not discussed in this booklet. As the enactment ofregulations concerning SN Steel (rolled steel for building structural use, JIS G 3136)now permits its use, the newly included Appendix 7 concerning this material hasbeen included along with tables comparing the SN material with the SS and SMSteels that are already in use. In this list of revisions, in cases where a passage can becompared with a part of the Fifth Edition, the passage is followed by its sectionnumber in parentheses.

LIST OF COMMITTEE MEMBERS

Research Committee on Building Materials and ProcedureChairman Katsuro KamimuraSecretaries Yasukazu Takahashi Fumiki Tomozawa Sunao NakaneMembers (Omitted)

Sub-committee on Steel WorkChairman Atsuhide HashimotoSecretaries Kazuhiko Moriya Tatsuo YamashitaMembers Hirofumi Aoki Takeshi Azuma Kimio Hamano

Mitsuru Izumi Mamoru Kimura Teruo KondoKazunori Koshida Takashi Makishi Shinji MatsushitaTetsuro Matsubara Moriyuki Matsuoka Hirohiko MatsuzakiTomoaki Miyano Masanori Mori Koji MoritaTadao Nakagome Masayuki Okamatsu Masaaki OshimaToyokazu Shimizu Masaaki Suko Yoshiaki TagokuAtsuo Tanaka Saburo Terakado Hiroshi TerunumaIwao Tsuyama Kiyoshi Uruno Yoshitaka Yabe

Working Group for Compiling the Outline of Important Changes in JASS 6, 6th Edition

Chairman Atsuhide HashimotoSecretaries Masayoshi Endo Masaaki SukoMembers Takashi Aihara Yohichi Fukuda Shohkichi Hiraoka

Tomihiro Hori Masayoshi Kawada Shigeo KurashimaShinji Matsushita Akihiro Nakao Masaaki OshimaAtsuo Tanaka Takao Tsujikawa Taketomi Yamada

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Summary of the 1996 (Sixth Edition) JASS 6 Revision

Preface

JASS 6 was prepared by carrying out revisions in line with the following policies.

1. JASS 6 and the Technical Recommendations for Steel Construction for Buildingshave been revised simultaneously to harmonize their content. New editions of theRecommendations for Quality Criteria and Inspection Standards of Steel Structuresand the Standards for the Ultrasonic Inspection of Weld Defects in Steel Structureshave been published.

2. In JASS 6, the previous title, Japan Architectural Standard Specification andCommentaries is revised by removing and Commentaries to refer to only the maintext in order to clarify its position as a specification for contract use.

3. The commentaries in JASS 6 and information of special note are all summarized astechnical guidelines. The volume concerning Factory Fabrication is, as a technicalexplanation, expected to serve as criteria for the provision of an autonomousfabrication control system with the background, reasons etc. included in the JASS 6provisions. Reference information and supervision guidelines specially mentioned forthe benefit of customers (constructors) are also provided. The Construction Site Workvolume is focused on items which must be implemented by construction worksuperintendents supervising structural steel work.

4. JASS 6 presents standard quality levels for buildings of normal size and formconstructed in Japan, basically describes widely used construction methods andtechnologies, and further clarifies noteworthy items.

5. There are three categories of provisions.[1] Provisions limiting construction methods and the persons qualified to performthem.[2] Provisions that stipulate performance but do not limit the construction methodsthat provide it.[3] Motivational (ideal) provisions that leave the method of satisfying thestipulations up to each specification user.

6. Concerning content for which an implementation system has not been provided, itshall be harmonized with social trends so that it can be completed and added whenlegal changes and the establishment of qualification systems have provided thenecessary conditions.

7. The SN Steel Material Identification Codes has been added to the Appendix.

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Section 1 General Provisions

1. Contract Use Specification

JASS 6 and the Technical Guidelines have been simultaneously revised with thecommentaries on JASS 6, information worthy of special note, etc. all recorded intechnical guidelines. The commentary has also been removed in order to strengthenusers' understanding of JASS 6 as a document positioned as a contract usespecification. In sum, the goal has been the creation of a practical specification forcontract use.

2. Inspection Standard Certificate

The term mill sheet has been replaced by the term standard quality certificate,and terms such as certificates including written test results, equivalent quality testcertificates, original equivalent standard quality certificates, etc. concerning matterssuch as the categorization of product certificates as standard quality certificates andas goods certificates, have been defined.

3. New JIS SN Steel

New JIS SN Steel (rolled steel for building structural use, JIS G 3136) has beenincorporated, and the past SS steel (JIS G 3101) and SM Steel (JIS G 3106)eliminated.

4. Quality Assurance

Quality control is performed to provide quality assurance of structural steel products.In other words, quality assurance is achieved by performing sufficient quality controlto keep the fabrication process in the control state. In this sense, the item, qualityassurance, is shifted to Section 2 Quality Control.

Section 2 Quality Control and Quality Assurance

1. Quality Assurance has been moved to this section from Section 1 GeneralProvisions . Scope of Application and General have been eliminated.

2. Quality Control has been divided into Quality Control by the General Contractorand Quality Control by the Structural Steel Fabricator.

In Quality Control by the General Contractor, two requirements, Quality controlof factory fabrication and construction site work shall be performed in accordancewith the construction plan. and It shall be possible to certify that the quality controlis being conducted appropriately to the supervisor whenever necessary. Recordsneeded for this certification shall be retained. are added as supplementaryrequirements. (2.2 Quality Control by the General Contractor).

In Quality Control by the Structural Steel Fabricator, the new supplementaryrequirements, Function of presenting quality control policies and Function ofkeeping records needed for certification of quality are added. (2.3 a. Quality Control

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Organization) .

Section 3 Materials

1. Structural steel products now include not only JIS standard products, but alsoproducts equivalent to JIS standard products and products approved by the Ministerof Construction (3.1 a. Structural Steel Products)

2. SN steel (JIS G 3136, rolled steel for building structures) is added to Table 3.1 as aJapan Industrial Standard for Structural Steel Products, and the SS material (JIS G3101, rolled steels for general structures) and SM material (JIS G 3106, rolled steelsfor welded structures) have been removed. Centrifugally cast pipes for weldedstructures (JIS G 5201) are also removed because they are a product approved by theMinister of Construction; not a JIS standard product.

3. Steel whose yield ratio, carbon equivalent and cracking parameter comply with thespecial notes are stipulated for SN steel itself (3.1 a Structural steel products).

4. Deck plate (JIS G 3352) is added to Table 3.2. (3.1 b Standards for shapes and sizesof structural steel products).

5. Anchor bolts (previously, SS400) are categorized as structural use anchor bolts(SN400B or SN490B) and as assembly use anchor bolts (unless specially noted,material is not limited to structural use anchor bolts). (3.2 High strength bolts, bolts,studs, and turnbuckles).

6. Flux core wire for CO2 gas shielded arc welding of atmospheric corrosion resistingsteel (JIS Z 3320), a JIS product for welding material, has been added to Table 3.4.(3.3. Welding materials).

7. Standards for material tests and weldability tests have been simplified, and can beomitted if the welding material is accompanied by a product certificate or anequivalent quality test certificate. (3.4 Material test and weldability test).

8. At the time that material is received, if it is SN material and its material identificationis displayed, it may be confirmed using a goods certificate instead of the original ofthe standard quality certificate (or an original equivalent standard quality certificate).(3.5 Purchase, receiving, and storage of materials).

Section 4 Fabrication

1. The provision for shop drawings has been clarified with the statement that the generalcontractor shall, "have the structural steel fabricator prepare the shop drawings, andafter the adequacy of construction sequence and structural details have beenconfirmed, shall obtain approval from the supervisor." (4.1 a Shop drawing).

2. The identification of the steel products after cutting shall conform with Appendix 7SN Steel Material Identification Codes, and Appendix 7 is added. (4.4Identification of steel material after cutting).

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3. The paragraph on grooving has been expanded and the grooving shape and scallopprocessing are to conform with special notes. In cases where it is not spelled out inthe special notes, a scallop may be either provided or not provided. Respective shapesare shown below, and concerning the curve of the arc of the scallop in particular, it isstipulated that, it shall be processed so that it smoothly contacts the flange. (4.7Grooving).

Figure 4.2 Grooving the Scallop

Figure 4.3 Grooving when no Scallop is provided

4. The range of treatment of friction surfaces when rust is spontaneously generated hasbeen changed from an extent of more than twice the outside diameter of the washerto the entire surface of the splice plate. (4.9 a. Treatment of friction surfaces).

5. Two items are added to Remarks for Treatment of Friction Surfaces. The splice plate shall be attached by oil-free temporary bolts when the plate is

temporarily affixed to the member before final installation. When a grinding is exercised to remove burrs from around a bolt hole after blasting,

that part shall be brought to red rust condition. (4.9 b. Remarks for treatment of friction surfaces).

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6. Standards for the temperature used to straighten distortion by heating have beenpartially revised. The straightening temperature when the material is water cooledafter air cooling shall be changed from 800 oC to 900 oC to 850 oC to 900 oC, andthe temperature at the start of water cooling has been changed from 500 oC to 650oC. (4.10 Straightening of distortion).

7. The inside radius of bending of plates that must provide plastic deformationcapabilities, such as columns and the haunch of beams and brace ends for example,has been required to set at more than 4 times the plate thickness. (4.11 Bending).

8. A new provision has been added concerning backing strips, and stipulates that a platethickness is to be equal to or greater than 9 mm, and in case where no scallop isformed, a two-piece type be used to fit to the shape of the corner of the fillet.

9. A new provision has been added that stipulates that the leg length of the bead of tackwelding shall be a minimum of 4 mm and that at the corners of cold formed squaresteel pipe and other locations subject to cold plastic processing, tack welding shall beavoided.

Section 5 Welding

1. A new provision stipulates that even where a qualification test for welders isspecially noted, a welder who has already been approved based on an equivalentqualification test may be exempted from the test with the authorization of thesupervisor. (5.4 d Welder qualification test) .

2. A new provision clearly stipulates that when a run-off plate is attached to a column -beam joint, it shall be attached to a backing strip and that it shall not be assemblywelded directly to the base metal. A run-off plate need not be removed after thewelding, and in case where it is needed to be removed, its method shall conform tothe special notes. (5.7 f. Run-off plates).

Figure 5.1 Example of Tack Welding of a Run-off Plate on a Beam - Column Joint

Tack welding to the basemetal to be in the groove

No tack welding to thebase metal outside ofgroove

Tack welding to the backing strip

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3. Provisions concerning backing strips are added. (5.7 General conditions for weldingwork)

(1) Tack welding of a backing strip on a beam - column joint using backing strips shall,as shown in Figure 5.2 a, not be performed in a range of 5 to 10 mm from both endsof the beam flange, nor within 5 to 10 mm of the startup point of the web fillet arcor the end of the fillet weld toe.

(2) A fillet weld used to assemble a backing strip shall be between 4 mm and 6 mm ofsingle pass, and shall be between 40 mm and 60 mm long.

One-piece type backing strip (applied when a scallop is formed)

Figure 5.2 a Tack Welding of Run-off Plates and Backing Strips (1/2)

Two-piece type backing strip (applied when a scallop is not formed)

Figure 5.2 a Tack Welding of Run-off Plates and Backing Strips (2/2)

Run-off plate: attached to abacking strip

One-piece type backing strip

Location where tack welding is permitted for backingstrip

Fillet weld S = 4 to 6 mm, 1 pass, length = 40 to 60mm

Run-off plate: attached to abacking strip

Two-piece type backing strip

Two-piece type backing strip: fit to the shape of the corner.Member with a backing strip assembly weld

Fillet weld S = 4 to 6 mm, 1 pass, Length = 40 to 60mm

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Figure 5.2 b. Case of Backing Strip Attached to the Outside of a Beam Flange

(3) As shown in Figure 5.2 b, when a backing strip is attached to the outside of a beamflange by on-site welding, it shall not be directly tack welded to the base metal suchas beam flange or column flange.

4. The need for a scallop for column - beam joints where a complete penetration weld isperformed on the beam flanges of the beam end welds shall be spelled out in thespecial notes. When there is no mention of it in the special note, it shall conform with4.7 Grooving a (2). When a scallop is needed for fabrication, the authorization of thesupervisor shall be obtained. (5.7 h. Scallop).

5. The ambient temperature when welding is carried out has been changed to read,"When the temperature is below - 5 C, welding shall not be performed. At atemperature between - 5 C and 5 C, welding may be done if the base metal in arange of 100 mm from the weld is appropriately heated. (5.7 g. Temperature, weather,others).

6. The case where the effective throat of a partial penetration weld need not bedecreased by 3 mm from the depth of groove has been newly stipulated to read, theeffective throat may be taken as equal to the groove depth in the case of SMAW orGMAW with joint configuration of a single or double U or J, or single or doublebevel or V with groove angle of 60 or more, and in the case of SAW. (5.10 cEffective throat).

7. Judgement on visual inspection and dimensional tolerance were based on a singlesampling of 10% or more in the previous revisions, but the new method nowstipulates that if a defective weld is found by the first sampling, a second sampling ofanother 10% shall be performed and the judgment shall be based on a total of 20%sampling. (5.13 Inspection for surface defects and profiles).

Section 6 High Strength Bolt Fastening

1. The size of the bolts that can be used has been expanded to also include M27 andM30 for both high strength bolts and Torshear type high strength bolts. (6.1 Highstrength bolts).

Tack welding

(a) Section

(a)Welding is to be avoided.

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2. The definitions of the bolt groups in tightening work have been revised from theprevious Figure 6.2 to the following figure. (6.4 Tightening of high strength bolts).

Figure 6.2 Tightening Sequence of Bolts

Section 7 Hexagon Bolt Fastening

No real revisions concerning hexagon bolt connections have been introduced.

Section 8 Anticorrosive Paint

1. The relative humidity at which painting work shall be suspended is changed fromover 80% to over 85%. (8.2 b Painting) .

2. In Table 8.3, JASS18 M-101, specification for two-component type epoxy resinprimer for metallic substrate , has, in response to the enactment of a JIS standard, beenchanged to JIS K5551. Similarly, JASS18 M-103, specification for zinc rich primer,has been changed to JIS K 5552. The item concerning two-component type thickmembrane epoxy resin primer for metallic substrate has been removed. (8.2 bPainting).

Bolt groups used for tightening work

Tightening sequence

Tightening of each bolt group shall be done from the center of thejoint towards the edge of the plate.

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Section 9 Inspection and Delivery of Products

1. Interim inspections, which are inspections performed by the receiving side, have beenintroduced and product inspections are categorized as in-house inspections and asreceiving / interim inspections. Because it is extremely difficult to uniformly performinterim inspections, the items inspected, methods, quantities, acceptance/rejectioncriteria, performance timings, etc. shall be spelled out in the special notes.

Section 10 Construction / Site Work

1. The Scope of Application has been expanded to include "work related to quality andprecision of structural steel frameworks, and later incidental work." (10.1 Scope ofApplication).

2. To guarantee sound anchorage of column bases, anchor bolts shall be classified aseither structural use anchor bolts or assembly use anchor bolts in accordance with thepurpose of the anchor bolts, that is, in the case of bolts that are load bearing (Atype), attention is drawn for the need to specify the material in the design drawing.(10.3 Anchorage).

Section 11 Fireproofing

1. In the Table 11.1 Fireproofing Methods and Materials, the membrane method andcomposite construction are removed, light weight cement mortar that is a methodwith ministerial approval has been added to spraying methods, and glass fiber matlaminated material has been added to winding methods. (11.2 b Types offireproofing).

Section 12 Hot-dip Galvanizing

1. The internal radius of curvature in bending performed prior to hot-dip galvanizingshall also conform to the section on processing that has been revised. (12.2 eBending).

2. The inspection of galvanized members shall satisfy the requirements in 9.1 ProductInspections. (12.4 b Inspection).

Section 13 Items to be Specified in the Special Notes

1. The important revisions in the table that list the items to be spelled out in the specialnotes are explained in the following.

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a. Items that must always be spelled out in the special notes

10.3 h Mortar Strength has been added.

b. Items that must be spelled out in case of adoption

4.10 Revised to (4) SN400, SN490.

8.3 Treatment other than rust-proof paint is added.

9.1 c (1) Interim inspection performed/not performed is added.

10.7 Deck plate and headed stud

a. (3) Case where used for structural use is added.

12.4 b. (3) Test of coating weight has been moved from the items thatmust always be spelled out to this category.

c. Items , if not spelled out, shall comply with this JASS 6 specification

5.7 h. Scallop necessary/unnecessary is added.

10.7 Deck plate and headed stud

e. (1) ii) Joining method when not used and Welding location ofplug weld have been added.

g.. Preliminary confirmation test (trial weld) has been added.

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Appendix 7. SN Steel Material Identification CodesCategory Case where specification No. material grades are marked by label and/or stencil on every piece of product . (marking is a mill's option) Other than those on the left

Type of Product plate and flat Rolled shapes (H, other shapes, flat) All platesshapes

All plates and shapes

Method Full-length dot-line method *1Name of type Full surface stamp method JIS-rolled H Out-to-out

constant rolled HOthers

(FR steel etc.)Full-length letter method

Color coding onend * 2

SN 400A(Not stipulated at this time) (Not stipulated at this time) *Note

"SN400A"to be displayed One green line

SN 400B Two widelyseparated dots

Two continuousdots

Twodiscontinuous dots

"SN400B"to be displayed

Two greenlines

SN 400CA combination of the

company logo and a Same as 400B for now "SN400C"to be displayedThree green

lines

40 K

gf G

rade

Others (Speciallyapproved material) Company logo

Distinguished identificationto be displayed

SN 490B One widelyseparated dot

One continuousdot

One discontinuousdot

"SN490B"to be displayed

Two yellowlines

SN 490CCombination of the company

logo and a Same as 490B for now.

"SN490C"to be displayed

Three yellowlines

50 K

gf g

rade

Others (Speciallyapproved material) Company logo


One of the markingmethods shown on the left

is essential.

OthersCompany logo


Remarks - Stamped with a gauge at apitch of approx. 350 mm.

- When it is a company logoand symbol, arrangealternately.

* Note: If necessary, the dot intervals will be surveyed in thefuture.

- Dot specifications

- To be marked on rolled H with a web height of 100 mm or more- Indicated at two locations equidistant from the center

of the web (see Note 1)

Essential ItemsAName of steel type

(SN400A, etc.)BShape Category Code

JIS-H: No codeOuter size: Each company's identification codeOthers: Each company's identification code

Optional itemsACompany name (code),

company logoBOthers: maker identification

code, dimensions, etc.Letter specifications (reference)ASize: Min. 10 mmBLetter line interval: Max.

1,000 mmExample:Star Steel SN400A-S-FR:

600 X 200 X 12 X 22

Companylogo

Dot diameter(End)

Discontinuous dots

Continuous dots

Widely separated dots

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*1 *2 SN Steel Material Identification Code Arrangements

Typeof steel

*1 Marking for full length dot line method

JIS-rolled H Out to out constant rolled H Others shapes (miscellaneous shapes , flat, FR steel, etc.)

Num

ber

of d

ots

Widely separated dots Continuous dots Discontinuous dots

* 2 Marking for color code on end method

All plates and shapes

Coloring code on endColor Number

Gre

enG

reen

Gre

enY

ello

wY

ello

w

Centerof web

Centerof web

Centerof web

Center ofwidth

Center ofwidth

Centerof web

Centerof web

Centerof web

Flat Steel

Can be at eitheredge.

Channel steel

Near the center of the web

Angle steel

Integrated on eitherthe left or rightflange and near thecenter of the flange

Bulb flats steel

Near the center ofthe web or nearthe spherical part

H or I steel

Near thecenter of theweb

Angle steel with unequal sides orunequal thickness

Near the centerof the web ornear the centerof the short side

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Table 1. Comparison in Application of SN Steel with Conventional SS/SM Steel

Before After the Enactment of SN SteelStrength Category JIS Standard Uses Standard Uses

JIS G 3101 SM 400 Buildings, bridges, ships,cars, and other structures .

SM 400 Buildings, bridges, ships,cars, and other structures .

SM 400A SM 400ASM 400B SM 400B

JIS G 3106

SM 400C

Buildings, bridges, ships,cars, oil tanks, vessels, andother structures. SM 400C

Buildings, bridges, ships,cars, oil tanks, vessels, andother structures.

* After "Rolled steel for building structural use" has beenfirmly established, "buildings" will be eliminated from JIS G3101 and 3106 (anticipated).

SN 400ANon-aseismic

members. Non-welded structure.

For secondary beams, studs, trusses, etc.that are based on elastic design and areprimarily connected with bolts.

SN 400B

For aseismicmembers.

For weldedstructure.

Materials intended to guarantee plasticdeformation performance and weldingproperties.Used primarily as members necessaryfor aseismic structure.

400 N/mm2

JIS G 3136(SN Steel)

SN 400C

Building structural use

For through thethickness strengthin addition to

Materials emphasizing type Bperformance plus special properties inthe plate thickness direction. UTinspection required.

JIS G 3101 SS490 Buildings, bridges, ships,cars, and other structures .

SS490 Buildings, bridges, ships,cars, and other structures .

SM 490A SM 490ASM 490B SM 490BSM 490C SM 490CSM490YA SM490YA

JIS G 3106

SM490YB


SM490YB


* After "Rolled steel for building structural use" has been firmlyaccepted, "buildings" will be eliminated from JIS G 3101 and3106 (anticipated).

490 N/mm2

SN 490B

For aseismicmembers.

For weldedstructure .

Materials intended to guarantee plasticdeformation performance and weldingproperties.Used primarily as members necessaryfor aseismic structure.


SN 490C

Building Structural Use.

For through thethickness strengthin addition to

Materials emphasizing type Bperformance plus special properties inthe plate thickness direction. UTinspection required.

Note 1. Description within shade ( ) indicate the situation after the enactment of SN Steel.

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Table 2-1 Comparison of the Properties of Rolled Steel for Building Structural Use (SN Steel) With those of SS Steel and SM Steel - Chemical Composition-

Chemical Composition x 10-2 (* x 10-3)StrengthCategory JIS Standard

ThicknessCategory C Si Mn P * S * Cu Cr Mo Ni V B Ceq PCM

JIS G 3101 SS400 - - - 50 50 --

--

--

--

--

--

--

--

SM400A t 5050 < t 200

2325

- 2.5C 35 35 ---

---

---

---

---

---

---

---

SM400B t 5050 < t 200

2022

35 60~140

35 35 --

--

--

--

--

--

--

--

JIS G 3106

SM400C t 100 18 35 140 35 35 --

--

--

--

--

--

--

--

SN400A 6 t 100 24

- - 50

50

--

--

--

--

--

--

--

--

SN400B 6 t 5050 < t 100

2022

35

60~140

30

15

--

--

--

--

--

--

36

26

400N/mm2


SN400C 16 t 5050 < t 100

2022

35

60~140

20

8

--

--

--

--

--

--

36

26

JIS G 3101 SS490 - - - 50 50 -

---

--

--

--

--

--

--

SM490A t 5050 < t 200

2022

55 160 35 35 ---

---

---

---

---

---

---

---

SM490B t 5050 < t 200

1820

55 160 35 35 --

--

--

--

--

--

--

--

JIS G 3106

SM490C t 100 18 55 160 35 35 --

--

--

--

--

--

--

--

SN490B 6 t 5050 < t 100

1820

55

160

30

15

--

--

--

--

--

--

44( 4 6 )

29

490N/mm2


SN490C 16 t 5050 < t 100

1820

55

160

20

8

--

--

--

--

--

--

44( 4 6 )

29

Notes : 1. Description within shade ( ) indicate for SN Steel. Descriptions with bold letters indicate the noteworthy items for SN Steel.

2. t > 100 for JIS G 3101 and 3106 are omitted. Those in strength categories other than 400 N/mm2 and 490 N/mm2 for JIS G 3101 and 3106 are omitted.3. Those whose standard values are stipulated on the table are all recorded on mill sheets.4. Concerning the chemical compositions, all items marked with the symbol are to be recorded on mill sheets whether stipulated or not.

(When P CM has been adopted, it is recorded along with items marked with a .)5. Ceq = C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/146. P CM = C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B

Those in ( ) are for thickness more than 40 mm.

For TMCP steelPlate thickness of 50 mm or less: Ceq . 38, PCM . 24Plate thickness over 50 mm: Ceq . 40, PCM . 26

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Table 2-2 Comparison of the Properties of Rolled Steel for Building Structural Use (SN Steel) With those of SS Steel and SM Steel -Mechanical Properties-

Mechanical PropertiesYield Point or Strength (N/mm2) ElongationStrength

CategoryJIS Standard Thickness

Category 6 or greater,less than 12

12 or greater,less than 16

16 Over 16,

max. 40

Over 40,

max. 100

TensileStrengthN/mm2

YieldRatio YR

%

Steel Thicknessmm

Specimen %Charpy

v E 0J

Contraction ofarea Z

Average value ofthree points

(Each test value)

UltrasonicDefect

Inspection

JIS G 3101(SS Steel)

SS400 245 235 215 400~510

SM400A t 5050 < t 200

SM400B t 5050 < t 200

27

JIS G 3106(SM Steel)

SM400C t 100

245 235 215 400~510

t 55 < t 1616 < t 5040 < t

t 55 < t 1616 < t 5040 < t 100

No. 5No. 1ANo. 1ANo. 4


21 17 24 23

21 18 22 23

47

Optional in a13 t case

SN400A 6 t 100 235 215

SN400B 6 t 5050 < t 100

235 235~355 215~335


400N/mm2


SN400C 16 t 5050 < t 100

235~355 215~335

400~510 80

6 < t 1616 < t 5040 < t

6 < t 1616 < t 5040 < t

No. 1ANo. 1ANo. 4

No. 1ANo. 1ANo. 4

17 21 23

18 22 24

27

25 (15 )

JIS G 0901grade

JIS G 3101(SS Steel)

SS490 285 275 275 490~610

SM490A t 5050 < t 200

SM490B t 5050 < t 200

27

JIS G 3106(SM Steel)

SM490C t 100325 315 295 490~610

t 56 < t 1616 < t 5040 < t

t 55 < t 1616 < t 5040 < t



19 15 19 21

22 17 21 23

47


SN490B 6 t 5050 < t 100

325 325~445 295 415


490N/mm2


SN490C 16 t 5050 < t 100

325~445 295 415

490~610 80 6 < t 1616 < t 5040 < t 100

No. 1ANo. 1ANo. 4

17 21 23

27

25 (15 )

JIS G 0901grade

Notes: 1. Description within shade ( ) indicate the SN Steel. Descriptions with bold letters indicate the noteworthy items for SN Steel.2. t > 100 for JIS G 3101 and 3106 are omitted. Those in strength categories other than 400 N/mm2 and 490 N/mm2 for JIS G 3101 and 3106 are omitted.

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Table 3. Tolerance on Thickness for Plates and CoilsUnit:mm

Less than1,600

1,600 or more,less than 2,000

2,000 or more,less than 2,500

Width

Standard

Thickness

JIS G3193

JIS G3136

(SN steel)

JIS G3193

JIS G3136

(SN steel)

JIS G3193

JIS G3136

(SN steel)6.00 or more,less than 6.30

0.50 +0.70-0.30

0.60 +0.90-0.30

0.60 +0.90-0.30

6.30 or more,less than 10.0

0.55 +0.80-0.30

0.65 +1.00-0.30

0.65 +1.00-0.30


0.55 +0.80-0.30

0.65 +1.00-0.30

0.65 +1.00-0.30


0.65 +1.00-0.30

0.75 +1.20-0.30

0.75 +1.20-0.30


0.70 +1.10-0.30

0.80 +1.30-0.30

0.80 +1.30-0.30


0.80 +1.30-0.30

0.95 +1.60-0.30

0.95 +1.60-0.30

63.0 or more,less than 100

0.90 +1.50-0.30

1.10 +1.90-0.30

1.10 +1.90-0.30

100 1.30 +2.30-0.30

1.50 +2.70-0.30

1.50 +2.70-0.30

Note) Those with width of 2,500 or more and less than 3,150, with width of 3,150 or moreand less than 4,000, and with width of 4,000 or more and less than 5,000 are omitted.

Table 4. Tolerance on Thickness for H-SectionsUnit: mm

JIS G 3192 JIS G 3136(SN steel)

6.0 or more and less than 16 1.0+ 1.7- 0.3

16 or more and less than 25 1.5

25 or more and less than 40 1.7

+2.3

- 0.7

40 or more and less than 100 2.0+ 2.5

- 1.5

Table 5 Existing Corner R and Revised Corner RUnit: mm

(Revision to JIS G 3192)

B

H

75 90 100

125

150

175

200

250

300

350

400

450

100 8 10

125 8 10

150 8 11 11

175 9 12

200 11 13 13

250 12 16 16

300 13 18 18

350 14 20 20

400 16 22 22

450 18 24

500 20 26

550

600 22 28

650

700 28

750

800 28

850

900 28Notes: 1. Figures in the table are corner R dimensions in the current JIS G 3192

standard.2. New corner R dimensions as given below depend upon the area of

different shading. 3. H - 400 X 400 X 22 are the existing corner R for civil engineering use.

8 R 13 R 18 R

Date post:	11-Oct-2015
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Japanese Architectural Standard Specification JASS 6

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