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Machining process of high-performance stainless steel and seamless steel pipe

A technology of seamless steel pipe and processing technology, which is applied in the direction of rigid pipe, pipe, pipe/pipe joint/pipe fitting, etc., can solve the problems of weak oxidation resistance, poor high temperature corrosion resistance, etc., and achieve the effect of strong oxidation resistance

Active Publication Date: 2006-08-16
JIANGSU WUJIN STAINLESS STEEL PIPE GRP
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Problems solved by technology

[0003] In order to overcome the shortcomings of existing austenitic steels such as high temperature resistance, high pressure, poor corrosion resistance and weak oxidation resistance, the present invention provides a high-performance stainless steel seamless steel pipe processing technology

Method used

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Embodiment Construction

[0013] A high-performance stainless steel seamless steel pipe processing technology adopts the following process: round steel preparation, round steel heating, hot rolling piercing, head cutting, pickling, grinding, lubrication, cold rolling, degreasing, solution heat treatment, straightening Straightening, pipe cutting, whitening, packaging and storage; the round steel adopts the smelting method of argon oxygen decarburization refining combined with electroslag remelting and composition fine-tuning electric furnace steelmaking, adding copper Cu, niobium Nb, nitrogen N , manganese Mn and titanium Ti, wherein copper Cu accounts for 2.5-3.5%, niobium Nb accounts for 0.2-0.6%, nitrogen N accounts for 0.05-0.12%, manganese Mn≤0.5%, and titanium Ti accounts for 0.07-0.13%. Among them: in the round steel heating process, the heating temperature is 980-1150°C, and the heating time is 60-80min; in the hot-rolling and piercing process, the hot-rolling temperature is greater than 1100°C;...

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Abstract

The invention process technology comprises the following steps of preparing of the round steel, heating of the round steel, hot-rolling punching, cropping, pickling, coping, lubricating, cold-rolling, defatting, solution heat treating, straightening, pipe-cutting, packing and putting in storage. In the round steel are added copper, Niobium, chlorine, manganese and titanium, wherein the copper 2.5~3.5 percent, Nb 0.2~0.6 percent, Cl 0.05~0.12 percent, Mn less than or equal to 0.5 percent and Ti 0.07~0.13 percent.

Description

Technical field [0001] The invention relates to a processing technology of stainless steel seamless steel pipe, especially a processing technology of high-performance stainless steel seamless steel pipe used in the fields of supercritical power plant boiler large-capacity unit, nuclear power unit, petroleum cracking device, large-scale coal liquefaction device, etc. . Background technique [0002] The power plant boiler units originally used in my country are generally below 300MW, and the units greater than 300MW are all imported from abroad. The pipes used in the unit are all ordinary austenitic steels. Although ordinary austenitic steels have high thermal strength, they have large thermal expansion coefficients, poor thermal conductivity, poor steam oxidation resistance and high temperature corrosion resistance, and high cost. Contents of the invention [0003] In order to overcome the shortcomings of existing austenitic steels such as poor high temperature resistance,...

Claims

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Application Information

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IPC IPC(8): F16L9/02C22C38/00
Inventor 章建新
Owner JIANGSU WUJIN STAINLESS STEEL PIPE GRP
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