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Large-diameter seamless steel tube for high-pressure gas cylinders and manufacturing method thereof

A technology of seamless steel pipes and high-pressure gas cylinders, applied in the field of metallurgy, can solve problems such as low strength, and achieve the effects of high strength, good impact toughness, and stable and durable plasticity

Active Publication Date: 2014-02-05
LUOYANG SUNRUI SPECIAL EQUIP
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  • Claims
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Problems solved by technology

However, with the continuous advancement of technology, the requirements for volume-to-weight ratio of steel cylinders are further increased, and the requirements for working pressure are higher than the existing 25MPa. Cr-Mo alloy steels such as 35CrMo cannot meet the requirements because their strength is lower than the design requirements.

Method used

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Embodiment Construction

[0036] The present invention is further described in conjunction with specific embodiment:

[0037] The chemical composition and mass percentage of large-diameter seamless steel pipes for high-pressure gas cylinders with working pressure above 25MPa are C 0.35, Si 0.35, Mn 0.27, Cr 1.35, Ni 2.95, Mo 0.35, V 0.14, P 0.007, S 0.005, and others are Fe .

[0038] A method for preparing large-diameter seamless steel pipes for high-pressure gas cylinders. The manufacturing method uses sponge iron and scrap steel as raw materials for steelmaking, and melts them into molten steel in an electric arc furnace. After refining outside the furnace and vacuum degassing, it is molded into For round tube blanks, the cooled die-cast tube blanks are heated in an annular heating furnace, thermally centered, thermally perforated, periodically rolled, and subjected to fixed-diameter rolling, cooling, fixed-length sawing, and straightening; flaw detection Finally, carry out normalizing heat treatme...

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Abstract

The invention belongs to the technical field of metallurgy, and provides a large-diameter seamless steel tube for high-pressure gas cylinders and a manufacturing method thereof. The large-diameter seamless steel tube for high-pressure gas cylinders comprises the following chemical components in percentage by mass: 0.30-0.60% of C, 0.20-0.50% of Si, 0.20-0.60% of Mn, at most 0.010% of P, at most 0.010% of S, 0.90-1.70% of Cr, 2.50-3.50% of Ni, 0.25-0.55% of Mo, 0.05-0.25% of V and the balance of Fe. The manufacturing method adopts spongy iron and scrap steel as raw materials for steelmaking. The large-diameter seamless steel tube has the advantages of high heat stability, high strength, impact toughness, stable enduring plasticity, high heat resistance, excellent corrosion resistance and excellent fatigue resistance, and the yield strength is not lower than 1000 MPa.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a large-diameter seamless steel pipe for high-pressure gas cylinders and a manufacturing method thereof. Background technique [0002] Large-volume steel seamless gas cylinders are widely used in China, and are mainly used in the transportation of industrial gases such as liquefied natural gas. The working pressure of the early seamless gas cylinders was low, and the bulk density was relatively small, and its material was mainly low carbon steel. In recent years, with the improvement of the working pressure of seamless gas cylinders and the continuous increase of volume-to-weight ratio, the steel for steel seamless gas cylinders has developed from low-carbon steel to medium-carbon steel, C-Mn steel and Cr-Mo steel. Cr -Mo-based alloy steel has the advantages of good toughness and plasticity while maintaining high strength, so it is widely used. At present, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C22C33/04C21D8/10
Inventor 张永峰邓春锋任方杰武春学常磊邵飞
Owner LUOYANG SUNRUI SPECIAL EQUIP
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