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Low-welding-crack-sensitivity high-strength seamless steel tube and manufacturing method thereof

A technology of low welding cracks and seamless steel pipes, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems such as the unspecified requirements for the flow of water in the inner shaft, and achieve the effect of good tempering stability

Active Publication Date: 2015-06-24
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its composition does not contain Cr, and there is no clear requirement for the amount of water flowing in the inner shaft during quenching

Method used

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  • Low-welding-crack-sensitivity high-strength seamless steel tube and manufacturing method thereof
  • Low-welding-crack-sensitivity high-strength seamless steel tube and manufacturing method thereof
  • Low-welding-crack-sensitivity high-strength seamless steel tube and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0048] The components in Table 1 and the following process were used to produce high-strength seamless steel pipes with low welding crack sensitivity.

[0049] Table 1 Chemical composition (wt%)

[0050]

[0051] The balance is Fe and unavoidable impurities.

[0052] Production process line:

[0053] Electric Furnace→LF Furnace→VD Vacuum Treatment→ Die casting slab or 350 continuous casting slab → heating in annular furnace → piercing → rolling by rolling mill → inspection → heat treatment (quenching + tempering) → straightening → super detection → inspection → packaging.

[0054] Among them, the basic requirements for rolling:

[0055] Before starting rolling, carefully check the surface quality of deformation tools such as rolls, guide discs, plugs, and mandrels, and strengthen the lubrication of mandrels. Avoid defects such as scarring and pitting on the surface of the steel pipe. During rolling, the heating temperature of the annular furnace is 1230-1270°C, and th...

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Abstract

The invention relates to a low-welding-crack-sensitivity high-strength seamless steel tube and a manufacturing method thereof, belonging to the field of manufacturing of low-alloy steel. The invention aims to provide a low-welding-crack-sensitivity high-strength seamless steel tube. The low-welding-crack-sensitivity high-strength seamless steel tube is composed of the following components in percentage by weight: 0.08-0.11% of C, 0.15-0.40% of Si, 1.20-1.60% of Mn, at most 0.013% of P, at most 0.008% of S, 0.030-0.080% of Nb, 0.03-0.08% of V, 0.025-0.040% of Ti, 0.10-0.30% of Cr, at most 0.10% of Ni, at most 0.30% of Cu, 0.0008-0.0020% of B, at most 0.10% of Mo, 0.015-0.050% of Al, and the balance of Fe and inevitable impurities. PCM is less than or equal to 0.21. The seamless steel tube has favorable low-welding crack sensitivity.

Description

technical field [0001] The invention relates to a high-strength seamless steel pipe with low welding crack sensitivity and a manufacturing method thereof, belonging to the field of low-alloy steel manufacturing. Background technique [0002] In order to meet the steel structure's demand for steel with low welding crack sensitivity, since the 1970s, CF steel, low welding crack sensitivity steel, has been developed internationally. This type of steel is widely used in the production of steel plates, and the performance of the product is guaranteed to meet the requirements of high strength and low welding crack sensitivity by adopting quenching + tempering or TMCP\TPCP + tempering process. [0003] The Chinese patent application with application number 200510047196.0 discloses a high-strength and low-welding crack-sensitivity steel thick plate and its production method. The composition in this invention is considered to add a certain amount of Cu, Ni, Mo elements on the basis ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C22C38/32C21D9/08C21D1/25
Inventor 吴红易良刚林发驹王西江陈雨田晓凡邹友富王阿娜
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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