This standard specifies the representation and test methods of Shore and Leeb hardness of roll, the requirements of test apparatus, tested roll, data processing and test report as well as the hardness conversion table.
This standard is applicable to the determination for Shore and Leeb hardness of various forged steel, cast steel and cast iron rolls.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 1172-1999 Conversion of Hardness and Strength for Ferrous Metal
GB/T 4341 Metallic Materials - Shore Hardness Test
GB/T 8170 Rules for Rounding off of Numerical Values
GB/T 17394-1998 Metallic Materials - Leeb Hardness Test
JJG 346 Verification Regulation of Shore Hardness Tester
JJG 347 Verification Regulation of Standard Shore Hardness Test Block
JJG 747 Verification Regulation of Equotip Hardness Tester
3 Test Principle
3.1 Shore hardness test principle
The diamond punch pin with specific shape and mass drops from a fixed height of h0 to the specimen surface, and the punch pin rebounds for a certain height of h; the ratio of h to h0 is namely the shore hardness number. The calculation formula is shown as Formula (1):
