... 20mm-130mmHardness:HRC 48-60;Chrome content:1.0-3.02.high chrome alloy ... 62;Chrome content:low chrome 0.3-1.5;high chrome 10-15characteristichigh hardnesslow ... 1,GB 223.2,GB 223.3,GB 223.4,GB/T 223.5,GB/T 223.12,GB/T 223.18,GB/T 223.23,GB ... /T 223.26,GB ... /T 223.46,GB ...