IS 5072-1988

标准号：IS 5072-1988
发布日期：1989/7/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围： This standard specifies the method for Rockwell superficial hardness test (scales and hardness range according to Table 1 for metallic materials ).TABLE 1 HARDNESS RANGE( Clauses 1, 2.1 and 4.1 )Hardness Scale Hardness Symbol Type of Indenter Preliminary Test Force, Fo N (kgf) Additional Test Force, Fl N ( kgf) Total Test Force, F N (kgf) Hardness Range15N HR15N Diamond cone 29·42 (3) 117·7(12) 147·1(15) 70·94 HR15N30N HR30N Diamond cone 29·42 (3) 264·8(27) 294·2(30) 42·86 HR30N45N HR45N Diamond cone 29·42 (3) 411·9(42) 441·3(45) 20·77 HR45N15T HR15T Steel ball 1·587 5 mm 29·42 (3) 117·7(12) 147·1(15) 67·93 HR15T30T HR30T Steel ball 1·587 5 mm 29·42 (3) 264·8(27) 294·2(30) 29·82 HR30T45T HR45T Steel ball 1·587 5 mm 29·42 (3) 411·9(42) 441·3(45) 1·72HR45T1.1 The hardness range for each scale and test force is dependent on the hardness and thickness of the test piece or surface layer tested. Guidance for tne choice of scale is given in Fig. 1.