The main technical requirements for galvanized steel pipe

Main technical requirements of galvanized coating steel pipe from the brand of galvanized steel pipe and chemical composition, manufacturing method, threaded pipe fittings, mechanical property and seven aspects. Followed by the corresponding provisions.

1, grades, and chemical composition

Galvanized steel pipe with steel grades and chemical composition should meet the requirements of GB/T3092 clarinet steel grades and chemical composition.

2, manufacturing methods,

Clarinet manufacturing methods (furnace or electric welding) welding choice by the manufacturer. Galvanized by hot dip galvanizing.

3, thread and the pipe joint

A: delivery of galvanized coating steel pipe with screws, screw thread should be car system after galvanizing. Thread should comply with the provisions of the YB 822.

B: steel pipe joint shall comply with the terms of YB 238; Malleable iron pipe fittings shall comply with the terms of YB 230.

4, mechanical properties, mechanical properties of the steel tube galvanized before should comply with the provisions of GB 3092.

5, the uniformity of the galvanized layer of galvanized coating steel pipe should be galvanized layer uniformity test. Steel tube specimens in the copper sulfate solution dipping 5 consecutive shall not become red (copper plating color).

6, cold bending test of nominal diameter greater than 50 mm galvanized steel pipe cold bending test should be done. Bending Angle is 90 °, bending radius to diameter 8 times. Without padding, when testing sample welds should be placed in the bending direction of the lateral or upper. After test, the sample should not have cracks and zinc layer peeling off with the elephant.

7, hydrostatic test water pressure test should be performed in the clarinet, eddy current flaw detection instead of hydrostatic test is also available. Test pressure or eddy current inspection comparison sample size should comply with the provisions of GB 3092. Steel mechanical properties is to ensure that the steel eventually use (mechanical properties) of the important performance indicators

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