Production method of seamless stainless steel tube for high-pressure boiler

A technology for stainless steel pipes and production methods, applied in furnaces, heat treatment furnaces, furnace types, etc., can solve the problems of inability to increase creep stress and inability to increase the grain size of TP347H stainless steel

Inactive Publication Date: 2010-06-16
常州市新亚不锈钢管有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0009] The disadvantages of the above-mentioned prior art are: the grain size of TP 347H stainless steel cannot be improved, nor can its creep stress be improved

Method used

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  • Production method of seamless stainless steel tube for high-pressure boiler

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Embodiment 1

[0022] The production method of the seamless stainless steel tube for the high-pressure boiler of the present embodiment comprises the following production steps:

[0023] Adjust the weight ratio of the carbon element contained in the seamless stainless steel raw material of TP347H to 0.06%-0.10%; Solution heat treatment, straightening, cold rolling, degreasing, second solution heat treatment, cold drawing, high temperature creep stress quenching and tempering, straightening and cutting pipes, and pickling.

[0024] Wherein, in the step of high-temperature creep stress conditioning, the seamless stainless steel pipe passes through four sets of conditioning devices successively, and the temperature and linear velocity when passing through each group of conditioning devices are as follows:

[0025] When passing through the first group of quenching and tempering devices, the quenching temperature is 1050°C-1080°C, and the time is 20-30 minutes; the tempering temperature is 680°C-...

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Abstract

The invention relates to a method for producing seamless stainless steel pipes for high-pressure boilers. The method comprises the following steps: adjusting weight ratio of carbon element in a raw material of TP347H type seamless stainless pierced billet to be 0.06 to 0.10 percent; and then carrying out truncating, acid washing, polishing, solid solution heat treatment, straightening, cold rolling, solid solution heat treatment, cold drawing, high-temperature creep stress conditioning, straightening and cutting pipes, and acid washing in turn on the pierced billet raw material, wherein the high-temperature creep stress conditioning is subjected to four groups of process temperature successively. The method improves level of grain size greatly based on the TP347H type seamless stainless steel, and the level of the grain size reaches 7 to 10; and at the same time, through adjusting the carbon element, the method improves corrosion resistance and steam oxidization resistance during use of the steel pipes at the environment of high temperature and high pressure, so that the seamless stainless steel pipes can be applied to supercritical boilers with large capacity and high parameters.

Description

technical field [0001] The invention relates to a production method of a seamless stainless steel pipe for a high-pressure boiler. Background technique [0002] TP347H (1Cr19Ni11Nb) is a high-carbon niobium-containing Cr-Ni austenitic stainless steel. Because it contains the stabilizing element Nb, it has good intergranular corrosion resistance and polysulfuric acid intergranular stress corrosion resistance. It is in acid, alkali, salt and other corrosive media. Its corrosion resistance is similar to that of Ti-containing 18-8 austenitic stainless steel, so it is widely used in boilers, power generation, petroleum, chemical, synthetic fiber, food, papermaking and other industries. Since Nb is less prone to burning than Ti, this steel grade can also be used as a welding core for welding chromium-nickel austenitic stainless steel. This steel has higher high temperature strength and better high temperature oxidation resistance than 316 series, so it is often used as heat stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/08C21D1/18
Inventor 周国平陈小义郭裕
Owner 常州市新亚不锈钢管有限公司
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