Spray Welded Double Shoulder Straight Hollow Sucker Rod Coupling

1) Basic material: alloy structural steel 35CrMo

2) Alloy powder: nickel base alloy

3) Main technical performance: surface finish: Ra0.4; Coating thickness: 0.254mm-0.508mm; Hardness of basic material: HRA56-62; Alloy coating surface hardness: HRC 58-62;