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‑100°C low temperature seamless steel pipe and production method thereof

A technology of seamless steel pipe and production method, applied in the field of seamless steel pipe, can solve the problems of unfavorable product market development and popularization, RE metal is easy to oxidize, reducing product impact toughness, etc., and achieves strong product market competitiveness and broad application prospects. , the effect of short production process

Active Publication Date: 2017-07-07
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The chemical composition of the above three patents added precious alloy elements Mo, Nb, V, Ti, Cu, RE and other elements, which increases the production cost of the product and is not conducive to the market development and promotion of the product; although Ti can refine the grain , but when adding Ti, it is also easy to form irregular TiN inclusions, which reduces the impact toughness of the product; RE metal is very easy to oxidize, when adding RE, once the control is not good, it is easy to form rare earth oxide inclusions, which reduces the impact toughness of the product

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  • ‑100°C low temperature seamless steel pipe and production method thereof
  • ‑100°C low temperature seamless steel pipe and production method thereof

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Embodiment Construction

[0027] The invention provides a seamless steel pipe for low temperature of -100°C, the chemical composition of which is calculated by weight percentage: C 0.06-0.10%, Si 0.21-0.33%, Mn 0.48-0.58%, P≤0.008%, S≤0.004% , Ni 3.4-3.7%, Al 0.03-0.06%, the balance is Fe and unavoidable impurities.

[0028] The chemical composition control range selected by the present invention can ensure that the normal temperature tensile properties of the seamless steel pipe and the impact toughness at -100°C are optimal, C, P, S, and Al exceed the upper limit of the composition control range, and the impact toughness at -100°C is low, and C Below the lower limit of the composition control range, the tensile properties at room temperature are low.

[0029] In the present invention, since Al can be used as a deoxidizer and a nitrogen fixer during steelmaking, and can refine grains, inhibit the aging of low-carbon steel, improve the toughness of steel at low temperatures, and can be added as an allo...

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Abstract

The invention belongs to the field of seamless steel tubes, and particularly relates to a seamless steel tube used at a low temperature of minus 100 DEG C and a production method of the seamless steel tube. The seamless steel tube used at the low temperature of minus 100 DEG C comprises the following chemical components: 0.06-0.10% of C, 0.21-0.33% of Si, 0.48-0.58% of Mn, less than or equal to 0.008% of P, less than or equal to 0.004% of S, 3.4-3.7% of Ni, 0.03-0.06% of Al and the balance of Fe and inevitable impurities. The seamless steel tube has good impact toughness and mechanical property at the temperature of minus 100 DEG C.

Description

technical field [0001] The invention belongs to the field of seamless steel pipes, and in particular relates to a seamless steel pipe for low temperature of -100°C and a production method thereof. Background technique [0002] With the rapid development of my country's economy, domestic petroleum, chemical and other energy industries need a large amount of low-temperature steel to manufacture various production and storage equipment for liquefied petroleum gas, liquid ammonia, liquid oxygen, and liquid nitrogen. Due to the flammability and ultra-low temperature of liquefied natural gas, compared with ordinary low-temperature pressure vessels, steel pipes for storage and transportation must have comprehensive characteristics such as strength, thermal stress and strain, welding performance and corrosion resistance, and the material is also required to be resistant to brittle crack propagation It has extremely strict requirements on the metallurgical quality and heat treatment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C22C38/02C22C38/04C22C38/06C22C33/04
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/08
Inventor 胡茂会郭元蓉吴红涂露寒
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM