MARSHALLOY MQ /FM · MARSHAlloY MQ®/FM, exclusively by Precision Marshall Steel, is a mold quality...

PRECISION MARSHALL www.marshalloymqfm.com

MARSHALLOY M

Q®/FM

The Deluxe Company

MARSHALLOY MQ®/FMTechnical Bulletin

PRECISION MARSHALLwww.marshalloymqfm.com

MAR

SHAL

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PRECISION MARSHALL2www.marshalloymqfm.com

Dear Industry Colleagues,

Precision Marshall Steel Company’s primary mission is to provide higher

value in the products and services we provide than can be found from

our competitors. When it comes to meeting and exceeding your service

and product quality needs, our goal is not to be the best in our industry,

but rather to be the best there ever has been in our industry. This is

what it means to be The Deluxe Company.

For over 65 years, we have been making substantial investments in

operating systems, plant facilities, equipment and personnel. The end

result is to keep improving our performance so that you can keep pace

with your competition. We know that we must earn your business every

day, and with continuous improvement, we all succeed. Despite our

longevity, our eye is on the future and not the past.

We also know that without strong relationships our business will

falter. We believe that “Companies Don’t Succeed, People Do.” Part of

our continuing effort is to build relationships inside and outside of

our organization that are productive and will stand the stresses of a

dynamic global business environment.

Finally, we know you have many choices of supply and we appreciate

your business. Remember, when you deal with The Deluxe Company,

you should always expect the best.

Respectfully,

Jackson MilhollanPresident and Chief Executive Officer

PRECISION MARSHALLwww.marshalloymqfm.com PRECISION MARSHALL

MARSHALLOY M

Q®/FM

3www.marshalloymqfm.com

Applications & General Features

Marshalloy MQ/FM is a very versatile grade

APPlICATIonS CoMPAReD To 4140/4142 CoMPAReD To P20

Tool Frames • Improved hardenability

• Through thickness consistency even for thick pieces

• Improved machinability

• Suitable for etching

• Suitable for polishing (A2 finish)

• Better machinability (tooling cost, machining cost)

• Superior cleanliness & polishability

Holder Blocks

Mold Cavities

Mechanical engineering

Prehardened Alloy SteelMARSHAlloY MQ®/FM, exclusively by Precision Marshall Steel, is a mold quality steel supplied in the prehardened condition. Special melting and refining practices are utilized tao produce a uniform product with exceptional cleanliness. These characteristics allow MARSHAlloY MQ®/FM to be polished to an extremely high finish required for plastic molding. The material is tested to rigorous standards to ensure uniformity of structure and exceptionally low inclusion levels. MARSHAlloY MQ®/FM is supplied prehardened to 262/321 BHn. The balanced composition of MARSHAlloY MQ®/FM ensures uniform cross-sectional hardness and is guaranteed to maintain the specified hardness throughout the plate.

MARSHAlloY MQ®/FM provides superior machinability while demonstrating outstanding cleanliness and soundness. It may be successfully substituted for P20 for plastic injection mold applications in addition to its usefulness in a wide range of mechanical applications, including short run tools and dies.


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Steelmaking Process

Ingot Casting

Continuous Casting

Ingot or Slab

Top cropping= low segregation


MARSHALLOY M

Q®/FM


Mold and Tool Steels Manufacturing Process

• Secondary Steelmaking

• Desulphurization

• Degassing

High cleanliness = polishability

Electric Arc Furnace


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Manufacturing Process for Plates and Blocks

Ingot or slab

Pre-forgingThick-plates ≥ 200 mm

Cross Rolling

= Isotropic Properties

= Compactness


MARSHALLOY M

Q®/FM


• Mold Quality• Hardness Consistency• Machinability

Ultrasonic ExamHardness ControlCuttingStress Relieving

Heat Treatment


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Chemistry

HARDneSS TYPICAl TenSIle PRoPeRTIeS

Typical (HB)

Guarantee (HB)

UTS Mpa (KSI)

YS MPa (KSI)

elongation (%)

Red. of Area (%)

295 262/321 950 (138) 750 (109) 15/16 55

Mechanical Properties

Hardness & Tensile properties similar to P20

C S Mn Ni Cr Mo V

P20 0.35 0.005 0.9 / 1.8 0.38 /

4142 (typical) 0.42 0.005 0.8 / 1.1 0.2 0.03

MMQ/FM(guarantee)

0.36/0.42

0.010/0.025

0.010/1.30

0.25/0.50

1.00/1.20

0.15/0.30 /

MMQ/FM(typical) 0.39 0.015 1.25 0.35 1.15 0.24 /

• Better Machinability

• Compatible with polishing & texturing

• Good hardenability, through thickness consistency

900 (1652) —

800 (1472) —

700 (1292) —

600 (1112) —

500 (932) —

400 (752) —

300 (572) —

200 (392) —


MARSHALLOY M

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C S Mn Ni Cr Mo V

P20 0.35 0.005 0.9 / 1.8 0.38 /

4142 (typical) 0.42 0.005 0.8 / 1.1 0.2 0.03

MMQ/FM(guarantee)

0.36/0.42

0.010/0.025

0.010/1.30

0.25/0.50

1.00/1.20

0.15/0.30 /

MMQ/FM(typical) 0.39 0.015 1.25 0.35 1.15 0.24 /

HardenabilityCCT diagram 4142 versus Marshalloy MQ FM

900 (1652) —

800 (1472) —

700 (1292) —

600 (1112) —

500 (932) —

400 (752) —

300 (572) —

200 (392) —

Temperature °C (°F)

100000 10010000 1000

Bainite

Bainite

Ferrite + Pearlite Ferrite + Pearlite

Vr 800/600°C (°C/h)

Martensite

¼" ½" ¾" 1" 3" 6"2"Air cooling (skin and core)

Equivalent Thicknesses

4" 6" 8"Water cooling½" thickness

skin

4" 6" 8"

MMQ800° C/h

41424000° C/h

Marshalloy MQ/FM

AISI 4142

equivalent Thicknesses


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Max 321 HB

Min 261 HB

Hardness Consistency

360 —

340 —

320 —

300 —

280 —

260 —

240 —

Hardness (HB)

Through Thickness Measurements

0 1" 2" 3"

Thickness

Marshalloy MQ/FM

4142(typical curves)

Air CooledWater Cooled

Air Cooled

360 —

340 —

320 —

300 —

280 —

260 —

240 —

Hardness (HB)

0 1" 2" 6"

Thickness

Marshalloy MQ/FM

4142(typical curves)

Air Cooled

Water Cooled

Accelerated Air Cooling

Poor homogeneity of 4142 versus MMQ/FM on thick pieces

3" 4" 5"

Max 321 HB

Min 261 HB


MARSHALLOY M

Q®/FM


Hardening Process

Poor homogeneity of 4142 versus MMQ/FM on thick pieces

Hardeningt Preheating and homogenization at 1250°F (680°C)t Final heating to1550/1600°F (840/870°C)

(Holding time 1H/inch)

Quenchingt Air / oil quenching down to 150°F (70°C)

(avoid oil quenching on pieces with complex shapes)

Temperingt Temperature choosen according to required hardness level

MMQ / FM — Tempering Curve

50

Hardness (HB)

200(392)

Tempering Temperature °C (°F)

300(572)

400(752)

500(932)

600(1112)

700(1292)

25

30

35

40

45Oil Quenching

Air Quenching


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MachinabilitySuperior machinability compared to P20

550 —

500 —

450 —

400 —

350 —

300 —

80 100 120 140

— 65

— 60

— 55

— 50

— 45

— 40

— 35

— 30

Marshalloy MQ®/FM

P20

Machined volume (until tool death)

Chip removal rate

+ 15%

Chip

rem

oval

rate

(cm

3 /min

)

Mac

hine

d vo

lum

e (c

m3)

Milling testØ 40 mm4 cuttersFeed 0.1 mm/rev.Depth 4mm

Cutting speed (m/min)

Marshalloy MQ / FM offers a microcleanliness (close to ESR) ensuring excellent polishability and improved machinability

warranted to an A2 finish

Incl

usio

n qu

antit

y


MARSHALLOY M

Q®/FM


Chip

rem

oval

rate

(cm

3 /min

)

Cleanliness / Polishability

60 —

50 —

40 —

30 —

20 —

10 —

0 —

K0 K1 K2 K3

Incl

usio

n qu

antit

y

K4

Marshalloy MQ/FM

ESR Quality

Inclusion size

Cleanliness measured per SEP 1570/71

Marshalloy MQ / FM offers a microcleanliness (close to ESR) ensuring excellent polishability and improved machinability

warranted to an A2 finish

25 —

20 —

15 —

10 —

5 —

0 —

Incl

usio

n qu

antit

y

Cleanliness measured per ASTM D ∑ oxides (B+C+D)

ESR Quality

Marshalloy MQ/FM


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The Precision-Marshall Guarantee of Quality

Precision-Marshall’s conformance to

specifications is the highest in the industry.

Precision-Marshall assumes complete

liability for any costs directly relating to a

deviation from our published specifications.

Any such costs, properly documented, will

be reimbursed.


MARSHALLOY M

Q®/FM


Notes

PRECISION MARSHALLPRECISION MARSHALLwww.marshalloymqfm.com

MAR

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MQ® /F

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HeADQUARTeRS99 Berry RoadWashington, PA 15301T • 800 537 7528F • 800 350 1353www.pmsteel.com

nATIonAl DISTRIBUTIon CenTeR1 northpoint CourtBolingbrook, Il 60440T • 800 537 7528E • [email protected]

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