A kind of x70m hot-rolled steel plate for thin-gauge gas transmission straight seam welded pipe and its manufacturing method

A technology of X70M, hot-rolled steel plate, applied in the field of high-strength X70M hot-rolled steel plate for natural gas transmission pipeline and its manufacturing field, can solve the problems of poor uniformity of steel plate performance, low production cost, high rolling resistance, etc., to optimize thickness, improve The effect of reducing the amount of reduction and increasing the rolling temperature

CN112981258BActive Publication Date: 2022-03-22ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-03-22

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Abstract

The invention relates to an X70M hot-rolled steel plate for a thin-gauge gas transmission straight seam welded pipe and a manufacturing method thereof. The chemical composition of the steel plate is calculated by weight percentage: C 0.05%-0.09%, Si 0.10%-0.35%, Mn 1.50 %~1.80%, P≤0.020%, S≤0.015%, Nb 0.04%~0.09%, Ti 0.008%~0.0250%, Al 0.015%~0.045%, Cr≤0.4%, V 0.020%~0.06%, N 0.0041 % to 0.006%, and the balance is Fe and unavoidable impurities; the steel plate produced by the invention is suitable for manufacturing X70M straight seam welded pipes for natural gas pipelines with a diameter of 10 to 18 mm and a wall thickness of 10 mm.
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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...

Examples

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...