Heat treatment:
Hot finished and cold finished tubes shall be heat treated at a temperature of 650℃ at least. And full annaealed,Website:http://www.lksteelpipe.com, isothermal annealed, or normalized and tempered condition at the option of the manufacturer, the minimum tempering temperature shall be not less than 650 ℃.
Mechanical Tests Required:
Tension test
Flattenting Test
Hardness test
Hydrostatic or Nondestructive Electric test
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