- Color: according to customers' requirement
2.Heat treatment process: Case hardening by high-frequency induction quenching
3.Wall thickness of the pipe: 4.00mm, 4.50mm, 7.50mm
- 4.Hardness:
- HRC58-HRC62 for inner quenching layer;
- HRC35-HRC40 for transition layer;
- HRC25-HRC30 for protective layer
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