Approved by State Bureau of Quality and Technical Supervision The People's Republic of China GBW01138—GBW01144

Certificate of Certified Reference Material

Nitrogen Cast Iron (for Spectroscopy Analysis)

Sample Number

Date of Certification

Central Iron & Steel Research Institute (Beijing China)

The Twelveth Research Laboratory of Watercraft Heavy Industry Group (Sian China)

This set of certified reference materials of Nitrogen Cast Iron consists of seven kinds as a series. They can be applied to calibrate instruments, evaluate analytical methods coordinate or assign the value when determining Nitrogen Cast Iron. They also can be used for production control and quality supervision in product analysis.

1. Preparation

The materials are smelted in a intermediate frequency induction furnace. Special preparation process is used to ensure the inherence quality. In the end, they are processed to 033mm * 20mm cakes.

2. Certified Value and Standard Uncertainty Standard uncertainty of certified value is obtained by the combination of uncertainty of definite value, ystematical deviation between laboratories and deviation from inhomogeneity of material. They are listed in the following table.

3. Analytical Methods

Element Analytical Methods

Al(t) Chromeazurol S Photometric Method; Cupferron Separation — Chromeazurol S Photometric Method ;EDTA Titrimetric Method ;ICP-AES

C Combustion — Gas Volumetric Method; Combustion — Infrared Absorption Method

Ce Chlorophosphonazo mA Photometric Method; Patassium Permanganate Oxidation 0- Hydrazo Photometric Method; DBC Arsenazo I Photometric Method; ICP-AES; ICP- MS

Cr Ammonium Persulfate Oxidation Titrimetric Method; Sodium Carbonate Separation Diphenylcarbazide Photometric Method;ICP —AES

Cu Sodium Thiosulfate Separation Iodimetric Method; Cupferron Separation Iodimetric Method; ICP-AES; AAS

La ICP —AES;ICP—MS;DBC Arsenazo I Photometric Method

Mg Cupferron Separation Eriochrome Black T Photometric Method; Cupferron Separation Dimethylbenzidine Blue Photometric Method ;AAS; ICP —AES

Mn Periodate Oxidation Photometric Method ;AAS; ICP—AES

Mo Thiocyanate Photometric Method; Butyl Acetate — Thiocyanate Extraction Photometric Method; ICP — AES

N

Distillation Separation Neutralisation Titrimetric Method;Combustion Thermal Conduction Method Dimethylglyoxime Photometric Method; Dimethylglyoxime Precipitation Giavimetiv Method;ICP-AES;AAS

P

Ammonium Phosphomolybdate Titrimetric Method; Diantipyrylmethane Gravimetric Method; Butyl Aceate Extration Photometric Method; N — Butyl Alcohol — Chloroform Extraction Photometric Method; 8 — Hydroxy Qunoline Phosphomolybdate Gravimetric Method ;1CP —AES

S Chromatographic Separation— Barium Sulfate Gravimetric Method;Combustion — Infrared Absorption Method

Si Gravimetric Method After Dehydration with Perchloric Acid

Sn Phenylflurone Photometric Method After Extraction Separation by Iodite; Catechol Violet — Bromohexadecyltrimethylamine Photometric Method; Phenylfluorone-CTMAB Photometric Method;ICP-AES;GFAAS

Ti Diantipyrylmethane Photometric Method; Chromotropic Acid Photometric Method ;ICP-AES

V Chromotropic Acid Photometric Method; Potassium Permanganate Oxidation Titrimetric Method;ICP-AES;GFAAS

Note: ICP—MS——Induced Couple Plasmma Mass Spectrometry;

ICP—AES——Induced Couple Plasma Atomic Emission Spectromety; HG—ICP —AES—— Hydride Generation Induced Couple Plasma Atomic

Emission Spectrometry. HG—AFS—— Hydride Generation Atomic Fluorescence Spectrometry. FAAS——Flame Atomic Absorption Spectrometry. GFAAS—— Graphite Furnace Atomic Absorption Spectrometry.

4. Homogeneity Detection The homogeneity of the samples, selected at random,is tested,and it shows that their homogeneity is good

truly. The linearity of certified items is tested in multiple instruments, and it show that the linearity is good. 5. Package and Storage The CRMs are packed in a glass bottle which is placed in a box with a label on it. Each time after using

them, lid the bottle carefully and store the bottle at dry place. 6. Data Supplier The Analysis Center of University of Science and Technology of Beijing The Technique Center of Wuhan Iron & Steel Company The Iron & Steel Research Institute of Benxi Iron & steel company The Technique Center of Fushun Specil Steel Company The Research Institute of Dayie Steel Factory The Special Steel Research Institute of Chongqing Special Steel Company The Iron & Steel Research Institute of Panzhihua Iron & Steel Company Shanghai Iron & Steel Research Institute Central Iron & Steel Research Institute

No Item Mass Fraction of Substance (10-2)

C Si Mn P S Cr Ni Cu V

GBW01138 Certified Value Standard Uncertainty

1.85 0.01

3. 15 0.02

0.387 0.003

0.544 0.012

0.032 0.001

0. 156 0.003

0. 294 0.003

1.83 0.01

0.0040 0.0004

GBW01139 Certified Value Standard Uncertainty

2.25 0.02

2.72 0.02

1.27 0.01

0.035 0.001

0.148 0.003

1. 02 0. 02

0. 194 0. 003

1.21 0.02

0.026 0.001

GBW01140 Certified Value Standard Uncertainty

2.51 0.02

1.43 0.02

0.758 0.005

0.038 0.002

0.089 0.002

0. 561 0.005

1.69 0.02

0.221 0.002

0.056 0.002

GBW01141 Certified Value Standard Uncertainty

3.12 0.02

2.06 0.01

0.526 0.004

0. 154

0.003

0.033 0.002

0.223 0.005

0.405 0.004

0.858 0.010

0. 105 0.002

GBW01142 Certified Value Standard Uncertainty

3.82 0.02

1.51 0.01

0.118 0.002

0.349 0.006

0.040 0.001

1.50 0.02

1.01 0.01

0.642 0.010

0.248 0.003

GBW01143 Certified Value Standard Uncertainty

4.26 0.03

1.00 0.01

0.293 0.003

0.086 0.004

0.165 0.004

0.246 0.004

0. 608 0.006

0.403 0.006

0. 500 0.004

GBW01144 Certified Value Standard Uncertainty

3.73 0.03

2.01 0.02

0.449 0.004

0.228 0.003

0.018 0.001

0.401 0.010

0.638 0.004

0.548 0.004

0.161 0.003

GBW01138 Certified Value Standard Uncertainty

Ti Mo Mg Al(t) La Sn Ce N 0.041 0.001

0.057 0.003

0.016 0.002

0.012 0.001

0.010 0.001

0.007 0.001

0.021 0.002

0.006 0.001

GBW01139 Certified Value Standard Uncertainty

0.032 0.002

0.111 0.004

0.005 0.001

0.081 0.002

0.003 0.001

0.069 0.002

0.006 0.001

0.017 0.001

GBW01140 Certified Value Standard Uncertainty

0.042 0.002

0.167 0.003

0.008 0.001

0.021 0.001

0.007 0.001

0.365 0.006

0.012 0.001

0.010 0.001

GBW01141 Certified Value Standard Uncertainty

0.040 0.001

0.308 0.004

0.018 0.002

0.082 0.002

0.012 0.003

0. 138 0.005

0.019 0.002

0.007 0.001

GBW01142 Certified Value Standard Uncertainty

0.113 0.003

0.537 0.008

0.034 0.002

0.057 0.002

0.008 0.001

0.104 0.003

0.030 0.002

0.005 0.001

GBW01143 Certified Value Standard Uncertainty

0.325 0.

003

0.857 0.005

0.006 0.001

0.385 0.

004

0.003 0.001

0.030 0.001

0.008 0.002

0.005 0.001

GBW01144 Certified Value Standard Uncertainty

0.220 0.003

0.220 0.003

0.059 0.003

0.023 0.001

0.013 0.001

0.128 0.004

0.046 0.003

0.004 0.001