Seamless steel pipe alloy steel with moisture and seawater corrosion resistance and steel pipe working process

A seawater corrosion and seamless steel pipe technology, applied in metal rolling and other directions, can solve the problems of poor resistance to chloride ion corrosion and high manufacturing cost, and achieve the effects of excellent comprehensive mechanical properties, good welding performance and mature technology.

Inactive Publication Date: 2005-02-16
TIANCHANG CITY SEAMLESS STEEL PIPE FACTORY ANHUI TIANDA ENTERPRISE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of stainless steel is not well resistant to chloride io

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composition of alloy steel seamless pipe is C0.06, Si0.21, Mn0.5, Cr0.98, Al0.70, Mo0.30, S≤0.015, P≤0.025, and the rest is Fe.

[0031] The technological process of the steel pipe includes piercing, pickling, phosphating, saponification, cold drawing processing, heat treatment, straightening, cutting, flaw detection and inspection and storage procedures; the piercing procedure includes blanking and piercing steps; the heat treatment procedure includes Secondary tube heat treatment and finished tube heat treatment.

[0032] The perforation step also includes the following procedures:

[0033] A. Heat the bar to perforate; the heating temperature is 1200°C; the heating time is 55 minutes; the temperature difference between the heated ends of the tube blank is not greater than 20°C;

[0034] B. Carry out a warm rolling head on one end of the perforated capillary tube, that is, roll the tube head into a solid body, which is convenient for subsequent cold drawing opera...

Embodiment 2

[0039] The composition of alloy steel seamless pipe is C0.10, Si0.49, Mn0.60, Cr1.10, Al0.80, Mo0.35, S≤0.015, P≤0.025, and the rest is Fe.

[0040] The processing method of its steel pipe is the same as embodiment 1.

Embodiment 3

[0042] The composition of alloy steel seamless pipe is C0.07, Si0.45, Mn0.45, Cr0.90, Al0.65, Mo0.28, S≤0.015, P≤0.025, and the rest is Fe.

[0043] The processing method of its steel pipe is the same as embodiment 1.

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PUM

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Abstract

This invention is technics about a special kind of alloy steel and its tube machining. The chemical components of the alloy steel are C0.06-0.10, Si0.20-0.50, Mn0.30-0.60, Cr0.80-1.20, Al0.40-0.80, Mo0.25-0.35, S<=0.015, P<=0.025, and Fe is the rest. The technics successfully solve the moist and seawater erode problems which the regular seamless steel used in heat exchanger can't deal with and prolong the equipment life-span, meanwhile it reduces manufacturing cost and saves alloy resources.

Description

technical field [0001] The invention relates to a processing method of a seamless steel pipe. Background technique [0002] With the transformation of our country's economy to marketization and the gradual integration with the international economy, the scope of crude oil exploitation continues to expand. The offshore exploitation of crude oil puts forward new requirements for the equipment in the petrochemical industry, that is, it can resist the corrosion of humid atmosphere and seawater. However, the No. 20 steel used in the original manufacture of heat exchangers in China is not resistant to the corrosion of humid atmosphere and sea water. The use of stainless steel is also not well resistant to chloride ion corrosion, and the manufacturing cost of the equipment is high. Contents of the invention [0003] The invention provides a seamless steel pipe alloy steel and a steel pipe processing method with anti-gas ion corrosion by adjusting the material composition of the...

Claims

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Application Information

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IPC IPC(8): B21B19/04C21D8/10C22C38/22
Inventor 张春祥张成明
Owner TIANCHANG CITY SEAMLESS STEEL PIPE FACTORY ANHUI TIANDA ENTERPRISE GROUP
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