Smoothness: 3.1*10-3 Coat Thickness(in): 0.01in ~ 0.02in Basic hardness: HRC 16-23 Surface Hardness: HRC 55-62 Hole rate: <2% Bonding Strength(Mpa): 484 Min. Hardness of the layer: 595HV0.2 Min. Tensile Strength: 655 Mpa Operating Temperature: -1000~400 Centigrade Temperature Life: > 180 days Package: wooden case, 1000pcs each case. Usage: oil exploration equipment, accessories, oil sucker rod coupling
