Approved by State Bureau of Technical Supervision The People's Republic of China GBW01375—GBW01379 GBW01380—GBW01384

Certificate of Certified Reference Material

Bearing Steel (for Chemical Analysis)

Sample Number

Date of Certification

Special Steel Co. Benxi lron & Steel Corp.

Ministry of Metallurgical Industry Benxi China

The serial reference material is suited to controlling of product's quality, calibrating an-alyzer, evaluating analysis method and also transferring quantitative value etc.

1. The Method Synopsis for Preparing The chemical composition was drew up and content was designed for each → The smelting with non

vacuum induction furnace → Casting into 40Kg round ingot at low temperature in bottom, casting → After skinning by latheing → lathe into filing smash → filter and sieving, take 0.84 —0.18 parts, and mixing full and homogenously → bottling → The homogenous test reached up to standard → Determinated value by method of chemical analysis → data collected. statistical process → Determinated reference value → package (Cutting into cylinder at 30 * 30mm for spectroscopy analysis).

2. Certified Value and Uncertainty No.

Item

Chemical Composition (Weight Percent)

C Si Mn P S Cr Ni Cu GBW013

75

Certified Value 0.773 0.710 0. 197 0. 032 0.012 0.986 0.275 0.0294

Standard Deviation (S) 0.007 0.010 0.003 0.001 0.001 0.004 0.003 0. 0006

GBW01376

Certified Value 0.907 0. 578 0.980 0.025 0.027 1.64 0. 072 0.190

Standard Deviation (S) 0.006 0.005 0.004 0. 001 0.001 0.01 0. 001 0. 004

GBW01377

Certified Value 0. 960 0.300 0.391 0.023 0. 017 1.41 0.141 0.136

Standard Deviation(S) 0.004 0.005 0.005 0.001 0.001 0.01 0. 00.3 0.002

GBW01378

Certified Value 1.11 0.429 0.667 0.021 0.0044 0.790 0.221 0.0924

Standard Deviation (S) 0.01 0.003 0.006 0.001 0. 0002 0.008 0.004 0.0012

GBW01379

Certified Value 1.31 0.274 1. 19 0.026 0.022 0.386 0.022 0.249

Standard Deviation (S) 0.01 0.004 0.01 0.001 0.001 0.004 0.002 0.006

GBW01380

Certified Value 0.773 0.710 0.197 0.032 0.012 0.986 0.275 0.0294

Standard Deviation(S) 0. 007 0.010 0.003 0.001 0.001 0.004 0.003 0. 0006

GBW01381

Certified Value 0. 907 0.578 0. 980 0.025 0.027 1.64 0.072 0.190

Standard Deviation (S) 0.006 0.005 0.004 0.001 0.001 0.01 0.001 0.004

GBW01382

Certified Value 0.960 0.300 0.391 0.023 0.017 1.41 0.141 0. 136

Standard Deviation (S) 0.004 0. 005 0. 005 0.001 0.001 0.01 0. 003 0.002

GBW01383

Certified Value 1. 11 0.429 0. 667 0.021 0. 0044 0.790 0.221 0. 0924 Standard

Deviation(S) 0.01 0. 003 0. 006 0.001 0.0002 0.008 0.004 0.0012

GBW01384

Certified Value 1.31 0.274 1.19 0. 026 0.022 0.386 0.022 0. 249

Standard Deviation(S) 0.01 0.004 0.01 0.001 0.001 0.004 0.002 0.006

3. Annlvsticnl Methods Elements Analyst ical Method

C Infra —red ray absorption method;Gas volumetric method.

Si Perchloric acid dehydration gravimetric method; Oxalic acid—ferrous sulfate silicon molybdenum blue photometric method

Mn Sodium arsenite —sodium nitrate volumetric method: Potassium periodate oxidation photometric method; Ammonium persulfate oxidation photometric method

P

Antiony phosphorus molybdenum blue photometric method? Bismuth phosphorus molybdenum blue photometric method;n — butanol —trichloromethane extraction photometric method; Acetic acid butyrate extraction phosphorus molybdenum blue photometric method

Aluminium oxide chromatographic barium sulfate gravimetric method;Com-busion —potassium iodate volumetric method

Cr Infra —red ray absorption method?Ammonium persulfate oxidation Volumetric method

Ni Dimethylgloxime photometric method; Dimethylgloxide — trichloromethane extraction photometric method

Cu Neocuproine trichloromethane extraction photometric method; BCO photometric method? Atom absorption method

4. Homogenous Test Adopted the square deviation method (F test method) test results,the homogeneity of the sample was

proved.

5. Package and Deposit the content of the packing minimal unit for this reference material is l00g/b. The glass bottle with

cork inside and cover outside was used according to the uniformity standard. It was kept in a plastics box sealed with label and certificate, kept in good condition of ventilation,

cleanness and dry place at house to prevent rust and oxidation. For spectroscopy analysis each piece of sample was packaged in a plastics box and a group of five

was packaged in a larger plastics box . Kept in dry place . 6. Cooperative Unit for the Development Steel Institute Daye Steel Works; Shanghai Iron & Steel Institute; Beijing Central Iron & Steel Institute Central Laboratory Dalian Steel works Steel Institute Fushun Steel works. Steel Institute Chongqing Special Steel Co. Iron & Steel Institute Taiyuan Iron & Steel Co. Institute of Special Steel Co. Benxi Iron & Steel Corp.