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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.