Low-Ni high-Mn economical low-temperature steel capable of being used at minus 196 DEG C and preparing method thereof

A manufacturing method and low-temperature steel technology are applied in the low-Ni high-Mn economical low-temperature steel and its manufacturing, and the manufacturing field of low-temperature storage tanks, which can solve the problem of high production cost

Inactive Publication Date: 2014-01-08
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, nickel-based low-temperature steel is used for this type of device in China, but the low-temperature steel that meets the requirements for use at -196°C has a high nickel content (above 9.0%), and the production cost is too high

Method used

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  • Low-Ni high-Mn economical low-temperature steel capable of being used at minus 196 DEG C and preparing method thereof
  • Low-Ni high-Mn economical low-temperature steel capable of being used at minus 196 DEG C and preparing method thereof
  • Low-Ni high-Mn economical low-temperature steel capable of being used at minus 196 DEG C and preparing method thereof

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specific Embodiment

[0051] Table 1 Chemical composition (wt%) of the embodiment of the present invention and comparative steel grades

[0052]

[0053]

[0054] Table 2 The main technical process of the embodiment of the present invention and the comparison steel grade

[0055]

[0056]

[0057] Table 3 The heat treatment process of the embodiment of the present invention and contrast steel grade

[0058]

[0059] Table 4 The mechanical test result of embodiment of the present invention and comparative steel grade

[0060]

[0061]

[0062] Table 5 Standard requirements for mechanical properties of the steel

[0063]

[0064] As can be seen from Table 3-5, although the low temperature performance of the steel grade of the present invention is slightly worse than that of the comparative steel grade with higher Ni content, it has far exceeded the standard requirements, and the steel grade of the present invention has low production cost, pure steel quality, and Good low-te...

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Abstract

The invention discloses low-Ni high-Mn economical low-temperature steel capable of being used at minus 196 DEG C and a preparing method thereof. The low-Ni high-Mn economical low-temperature steel capable of being used at minus 196 DEG C and the preparing method thereof solve the problem that existing low-temperature steel is high in technological difficulty and high in cost. The low-temperature steel comprises, by weight, C<=0.04, Si<=0.05, Mn:1.00-1.50, P<=0.005, S<=0.003, Alt:0.015-0.050, Ni:7.00-8.00, Nb:0.02-0.05, Ti:0.008-0.025, N<=0.004, at least one of Mo<=0.35, Cu<=0.20 and Ca<=0.005, and the balance Fe and inevitable impurities. The preparing method comprises the steps of smelting, rolling and drawing. The steel prepared with the method is good in toughness and welding performance after composition design, impurity control, rolling and heat treatment and can be used for manufacturing pressure vessel equipment requiring low-temperature usage in the LNG industry, and production difficulty and cost are effectively reduced.

Description

technical field [0001] The invention relates to a low-temperature steel and a manufacturing method thereof, in particular to a low-Ni and high-Mn economical low-temperature steel applicable to -196°C and a manufacturing method thereof, mainly used in the manufacture of LNG low-temperature storage tanks. Background technique [0002] With the diversification of global energy resources and the increasing emphasis on environmental protection, natural gas, as a clean energy, will occupy an increasing proportion in the future. Since the storage and transportation temperature of liquefied natural gas is below -162°C, it is required that the materials used to store liquefied natural gas have good low-temperature toughness, strength, and sufficient resistance to brittle cracking and crack arrest at ultra-low temperatures. [0003] At present, the materials used in the LNG storage and transportation equipment built in the world are mainly 9Ni steel with a Ni content of about 9%. Bef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/16C21C7/04C21D8/02
Inventor 战国锋刘继雄周桂峰邹德辉郭斌刘文斌王宪军黄海娥杨秀利
Owner 武汉钢铁有限公司
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