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material:Cr 40 surface hardness:hrc56-62 basic hardness:hra56-62 life>180days shouguang xinda petroleum machine accessories .Co .,Ltd.
1.)material :40Cr or other 2.)standard: API SPEC11B 3.)Feature: 1.Coat Thickness( in ): 0.01in-0.02in 2. Surface hardness: HRC56-62 Basic hardness:HRA56-62 3.Life: 180days 4.Min. Tensile Strength: 655 Mpa 5. phosphorylate or not (according to demand) 4.) Hole rate: 2% ...[Read More]