标准洛氏硬度块（环 形Ф60×Ф10×10/MM,0.2公斤/块） 60-70HRC 50-55HRC 40-50HRC 30-35HRC 20-30HRC 70-85HRA 60-70HRA 85-95HRBW 60-70HRBW 标准洛氏硬度块（长方形60×40×10/MM,0.2
