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High-yield-ratio and high-steel-grade control method for nickel-based corrosion-resistant alloy NS3304 seamless pipe

A technology of corrosion-resistant alloy and control method, which is applied in the field of high steel grade control and high yield ratio of nickel-based corrosion-resistant alloy NS3304 seamless pipe, which can solve the problems of high yield ratio of seamless pipe and precise control of high steel grade. , to achieve the effect of good surface quality, high dimensional accuracy and precise control

Inactive Publication Date: 2018-05-22
ZHEJIANG JIULI HI TECH METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no patent report on high yield ratio and high steel grade precise control of nickel-based corrosion-resistant alloy NS3304 seamless pipe in China.

Method used

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  • High-yield-ratio and high-steel-grade control method for nickel-based corrosion-resistant alloy NS3304 seamless pipe
  • High-yield-ratio and high-steel-grade control method for nickel-based corrosion-resistant alloy NS3304 seamless pipe
  • High-yield-ratio and high-steel-grade control method for nickel-based corrosion-resistant alloy NS3304 seamless pipe

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Embodiment 1

[0027] The embodiment of the present invention includes processing the billet of the nickel-based corrosion-resistant alloy NS3304 to a yield strength of 1050 MPa or more at room temperature through a cold rolling process and a heat treatment process in sequence; in the cold rolling process, the billet is at least twice Secondary cold rolling, and make the final deformation of the billet 35%~55% to obtain a pipe with a yield strength of 1050~1350MPa; in the heat treatment process, the heat treatment temperature can be changed, and the heat preservation can also be formulated according to specific specifications. Time is used to control the grain size of the pipe to be in grades 4-9, so as to obtain a finished pipe with an average yield strength ratio of about 0.88-0.95. In the cold rolling process, the range of cold rolling deformation is 35%-55%, and the range of elongation coefficient is 1.5-2.3.

[0028] The cold-rolling process is two-roll cold-rolling, and the two-roll co...

Embodiment 2

[0031] Embodiments of the present invention The embodiments of the present invention include processing the billet of the nickel-based corrosion-resistant alloy NS3304 through a cold rolling process and a heat treatment process to a yield strength of more than 900 MPa at room temperature; in the cold rolling process, at least the The billet is cold-rolled twice, and the final deformation of the billet is 15%~50% to obtain a pipe with a yield strength of 900~1250MPa; in the heat treatment process, by changing the heat treatment temperature, it can also be adjusted according to the specific Specifications are used to formulate the holding time to control the grain size of the pipe to be in the 4-9 grade, so as to obtain a finished pipe with an average yield strength ratio of about 0.88-0.95. In the cold rolling process, the range of cold rolling deformation is 15%-50%, and the range of elongation coefficient is 1.1-2.0.

[0032] The cold rolling process described in the embodime...

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Abstract

The invention discloses a high-yield-ratio and high-steel-grade control method for a nickel-based corrosion-resistant alloy NS3304 seamless pipe. The high-yield-ratio and high-steel-grade control method comprises the following steps: carrying out heat treatment on a blank of a corrosion-resistant alloy NS3304 through different heat treatment processes to achieve the high-yield-ratio requirements that the tensile strength of the rolled pipe is 100MPa or 50MPa and above greater than the yield strength, and the like; and machining the blank through different cold-rolling processes to achieve thehigh-steel-grade requirement that the room-temperature yield strength is 900MPa and above and even 1350MPa. The cold-rolling processes comprise a two-roll cold rolling process and a multi-roll cold rolling process. In the case of two-roll cold rolling, the final deformation quantity of the blank is enabled to be 35% to 55%, so as to control the yield strength of the pipe to be 1050MPa to 1350MPa;and in the case of multi-roll cold rolling, the final deformation quantity of the blank is enabled to be 15% to 50%, so as to control the yield strength of the pipe to be 900MPa to 1250MPa. In the heat treatment process, the grain size of the pipe is controlled to be 4 to 9 grade through changing a heat treatment temperature and a heat insulation time, so that the finished pipe with a yield ratiomean value of about 0.88 to 0.95 is obtained. The high-yield-ratio and high-steel-grade control method disclosed by the invention has the advantage that the finished pipe is high in dimensional accuracy, high in surface quality, and accurate in steel grade and yield ratio control.

Description

technical field [0001] The invention relates to the technical field of production of nickel-based corrosion-resistant alloy NS3304 seamless pipes, in particular to a method for controlling high yield ratio and high steel grade of nickel-based corrosion-resistant alloy NS3304 seamless pipes. Background technique [0002] Nickel-based corrosion-resistant alloy NS3304 is an improved, ultra-low carbon Ni-Cr-Mo nickel-based corrosion-resistant alloy. In order to reduce the intergranular corrosion tendency of the alloy, it controls the content of C and Si in the alloy. Reducing the content of C can reduce the precipitation of carbides in the alloy, and reducing the content of Si can reduce the precipitation of intermetallic phases in the alloy, so as to improve the grain resistance of the alloy. The purpose of inter-corrosion. The alloy has excellent corrosion resistance to both oxidizing and moderately reducing media, especially in the presence of F － , Cl － In the oxidizing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 孙文强王宝顺王曼谢飞杨晨黄伟
Owner ZHEJIANG JIULI HI TECH METALS