Thin-gauge X70M hot-rolled steel plate for gas transmission longitudinal welded pipe and manufacturing method

A technology of X70M and hot-rolled steel plates, which is applied in the field of high-strength X70M hot-rolled steel plates for natural gas pipelines and its manufacturing, can solve the problems of poor uniformity of steel plates, high rolling resistance, and low production costs, and achieve optimized thickness and improved The effect of starting rolling temperature and increasing reduction

Active Publication Date: 2021-06-18
ANGANG STEEL CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

It can meet the technical requirements of X70M steel plate without subsequent off-line heat treatment, and solves the problems of large rolling resistance, high straightening resistance and poor uniformity of steel plate performance in the production process of thin gauge, high strength, and ultra-wide X70M hot-rolled steel plate. The steel plate produced has high strength, high toughness and good comprehensive properties, which can ensure the safety of natural gas transmission line pipes, and the production cost is low and the economy is good

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  • Thin-gauge X70M hot-rolled steel plate for gas transmission longitudinal welded pipe and manufacturing method
  • Thin-gauge X70M hot-rolled steel plate for gas transmission longitudinal welded pipe and manufacturing method
  • Thin-gauge X70M hot-rolled steel plate for gas transmission longitudinal welded pipe and manufacturing method

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Embodiment Construction

[0029] The invention provides a X70M hot-rolled steel plate for a thin gauge gas transmission straight seam welded pipe. The thickness of the steel plate is 10-18mm; the chemical composition of the steel plate is calculated by weight percentage: C 0.05%-0.09%, Si 0.10 %~0.35%, Mn1.50%~1.80%, P≤0.020%, S≤0.015%, Nb 0.04%~0.09%, Ti 0.008%~0.0250%, Al0.015%~0.045%, Cr≤0.4%, V 0.020% ~ 0.06%, N 0.0041% ~ 0.006%, the balance is Fe and unavoidable impurities; O ≤ 0.0050% in impurities, and the total amount of other impurity elements is less than 0.05%.

[0030] A method for manufacturing X70M hot-rolled steel plates for thin-gauge gas transmission straight seam welded pipes. The production process is molten steel smelting→outside furnace refining, degassing→continuous casting→slab reheating→controlled rolling→controlled cooling→air cooling to room temperature ;details as follows:

[0031] 1) Process from molten steel smelting to continuous casting:

[0032] The raw material is pre...

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Abstract

The invention relates to a thin-gauge X70M hot-rolled steel plate for a gas transmission longitudinal welded pipe and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by weight of 0.05%-0.09% of C, 0.10%-0.35% of Si, 1.50%-1.80% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.04%-0.09% of Nb, 0.008%-0.0250% of Ti, 0.015%-0.045% of Al, less than or equal to 0.4% of Cr, 0.020%-0.06% of V, 0.0041%-0.006% of N and the balance of Fe and inevitable impurities. The produced steel plate is suitable for manufacturing the X70M longitudinal welded pipe for a natural gas conveying pipeline with the pipe diameter being phi 1422 mm and the wall thickness being 10-18 mm.

Description

technical field [0001] The invention relates to the technical field of low-carbon micro-alloy steel production, in particular to a pipe diameter of A high-strength X70M hot-rolled steel plate for a natural gas transmission pipeline with a wall thickness of 10-18 mm and a manufacturing method thereof. Background technique [0002] Pipeline transportation is the most economical, most convenient and most important transportation method for long-distance natural gas transportation. In order to reduce the construction investment and operation and maintenance costs of long-distance natural gas pipelines and improve transmission efficiency, long-distance oil and gas pipelines have always been developed in the direction of large diameter and high pressure; at the same time, in order to ensure the economy and safety of their service, some branch lines The thickness of the project steel pipe is gradually decreasing while the strength level is gradually increasing. Correspondingly, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/24C22C38/38C21C1/02C21C7/072C21C7/10C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C38/24C22C38/38C22C38/001C22C33/04C21C1/02C21C7/072C21C7/10C21D8/0226C21D8/0263Y02P10/143
Inventor 徐海健沙孝春任毅姚震王爽康超应传涛渠秀娟
Owner ANGANG STEEL CO LTD
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