USSR STATE STANDARD METALS METHOD OF BRINELL HARDNESS MEASUREMENT GOST 9012-59 (CMEA Standard 468-88, ISO 6506-81, ISO 410-82) Official Edition English Version Approved by Interstandard STANDARDS PUBLISHING HOUSE Moscow STANDARDS B. METALS AND METAL PRODUCTS Group B09 to GOST 9012-59 Metals. Method of Brinell Hardness Measurement (Revised Edition. December 1986, January 1993) In what place Is printed Shall be printed Appendix3.Table Column 0.08. For diameter 4.10 204 209 (IUS Standards Information Catalog? No. 4, 2001) to GOST 9012-59 Metals. Method of Brinell Hardness Measurement (Revised Edition, January 1993, with Amendments Nos. 2, 3, 4 and 5) In what place Is printed Shall be printed (201。) (201)°℃ Clause 4.1 (IUS No. 4, 2003) FOCT 9012-89 UDC 669.001.4:008.354 Group B09 U s R TE D GOST METALS 9012-59 Method of Brinell Hardness Measurement (CMEA Standard 468-88, ISO 6506-81, OKSTU (All-Union Classification Code of Standards and ISO 410-82) Specifications) 1909 Validity period since 01.01.60 until 01.07.95 This Standard establishes the method of Brinell hardness measurement for metals with hardness of no more than 650 units. The method is based on impressing of a ball, made of steel or hard alloy, into a sample (or article) under effect of a force, applied perpendicularly to the sample's surface within certain time interval, and measurement of imprint diameter after removal of the force. This Standard fully complies with CMEA Standard 468-77. Definitions and designations are specified in Appendix 1. (Amended Wording, Amendment No. 5). Official Edition Reprinting is prohibited * Standards Publishing House, 1993 Revised Edition with Amendments TOCT 9012-89 1. SAMPLING 1.1. Sample thickness S shall exceed the imprint depth h no less than 8 times and shall be calculated using the formula: 0.102.F S≥8 (when F is expressed in N) πDHB(HBW) F S≥8 (when F is expressed in kgf) πDHB(HBW) Minimal sample's thickness shall be determined in accordance with Appendix 2. 1.2. Sample's surface shall be flat and smooth Surface roughness of a sample (or platform on a product) Ra shall be of no more than 2.5 microns in accordance with GOST 2789-73, unless otherwise is indicated in specifications and technical documentation for metal products. 1.3. A sample shall be prepared so that metal properties does not change as a result of mechanical or other processing, for example heating or hardening. Section 1 (Amended Wording, Amendment No. 5). Section 2 (Removed, Amendment No. 5). 2. PREPARATION FOR TESTING 2.1. The surface of a sample or tested product shall be plane, smooth and free from oxide film. When preparing the sample surface it is necessary to take measures, eliminating the change of metal properties as a result of heating or hardening. Processing of a sample (product) surface may be carried out by polishing or with aid of fine file. If hardness is determined with aid of a ball 1 mm in diameter the sample surface shall be polished. 2.2. The thickness of tested sample (product) shall be chosen so that there are no visible traces of deformation on the opposite side of the sample after testing. 3. EQUIPMENT 3.1. The device for hardness measurement shall be in accordance with GOST 23677-79. (Amended Wording, Amendment No. 4). 3.2. Steel ball of 10.0; 5.0; 2.5; 2.0 or 1.0 mm in diameter shall have hardness of no0 less than 850 HV10; 2 FOCT 9012-89 A ball made from hard alloy of 10.0; 5.0; 2.5: 2.0 or 1.0 mm in diameter shall have hardness of no less than 1 500 HV10. Maximum deviations of ball diameter from the nominal one are specified in table 1a. Table la Nominal ball diameter, in mm Maximum deviations 10.0 ± 0.005 5.0 ± 0.004 2.5 ± 0.003 2.0 ± 0.003 1.0 ± 0.003 The requirements for diameter variability, for inconstancy of unit diameter, for deviation from sphericity and for surface roughness shall correspond to ball accuracy degree 20 in accordance with GOST 3722-81. (Amended Wording, Amendment No. 5). 3.3. (Removed, Amendment No. 5). 4. HA