方形的钢管

1 for steel nominal diameter. 88.9 mm, nominal thickness is 6.45 mm. Fang torque tube 1.2 the diameter and wall thickness of steel deviation should be allowed to meet the prescribed in table 1. Table outside the allowable deviation + 0.50-0.20 mm thickness mm allowable deviation + 0.97 mm - 0.77 mm 2 the length of steel 9400mm 9750mm normally. Figure 3 The degree of curvature of steel tube 3.1 must not be more than 1.0 mm/m. Steel surface and at 3.2 steel vertical axis should be clear burrs, incision. Four weight pipe, according to the actual weight shall be ordered to theoretical weight. Steel 13.115 weight per meter theory/kg. 5 the steel products deviation should be allowed to meet the chemical composition of GB/T 222 of relevant provisions. 6 delivery status in hot steel delivery status. 7. The proper heat treatment, mechanical properties of steel pipe mechanics performance should achieve the API SPEC 5CT N80 steel grade in the request. 8. The consistency of steel pipe should be driven by eddy current testing out inspection of steel, eddy current inspection consistency contrast samples for the hole diameter of artificial defects of ± 0.01 mm φ 2.2 mm. 9 per weight does not exceed 2 tons of steel, steel surface should besmear anticorrosion paint. The parties, and it clearly in the contract or agreement, according to mark.