A wide-width high-strength toughness thick-walled x80m pipeline steel plate and its manufacturing method

A high-strength, toughness, steel plate technology, applied in wide-width high-strength-toughness thick-walled X80M pipeline steel plate and its manufacturing field, can solve the problems of high rolling resistance, high straightening resistance, poor uniformity of steel plate properties, etc. Yield-strength ratio, the effect of improving composition uniformity

CN112981254BActive 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 a wide-width high-strength toughness thick-walled X80M pipeline steel plate and a manufacturing method thereof. The chemical composition of the steel plate is calculated by weight percentage: C 0.045%-0.08%, Si 0.20%-0.38%, Mn 1.55%-1.85%, Cu 0.15%~0.35%, P≤0.010%, S≤0.015%, Nb 0.04%~0.08%, Ti 0.015%~0.028%, Al 0.015%~0.045%, Cr 0.25%~0.5%, N 0.004%~0.006 %, V 0.032%~0.06%, Zr 0.03%~0.05%, Ni≤0.15%, Mo≤0.12%, Ca: 0.0012%~0.0035%, the balance is Fe and unavoidable impurities; the steel plate produced by the present invention It has the comprehensive properties of high strength and good low temperature toughness, which can ensure the safety of oil and gas transportation pipelines.
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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 wide-width, high-strength and toughness thick-walled X80M pipeline steel plate and a manufacturing method thereof. Background technique

[0002] Pipeline transportation is the most economical, most convenient and most important way to transport oil and gas over long distances. In order to improve the efficiency of oil and gas transmission, the transmission pressure and diameter of long-distance oil and gas pipelines are increasing, and the maximum diameter of steel pipes required for oil and gas pipeline construction has reached At the same time, in order to ensure safety, the strength level and thickness of steel pipes are also increasing, and the corresponding pipeline steel plates must meet the requirements of thick wall (>25mm), large plate width (>4000mm), and high steel grade (X80M grade). Wide and thick specification line pipes are ma...

Examples

Embodiment Construction

[0030] The invention provides a wide-width, high-strength and toughness thick-walled X80M pipeline steel plate, the width of the steel plate is >4000mm, and the thickness is 25-40mm; the chemical composition of the steel plate is calculated by weight percentage: C 0.045%-0.08%, Si 0.20% ~0.38%, Mn 1.55%~1.85%, Cu 0.15%~0.35%, P≤0.010%, S≤0.015%, Nb 0.04%~0.08%, Ti 0.015%~0.028%, Al 0.015%~0.045%, Cr 0.25%~0.5%, N 0.004%~0.006%, V 0.032%~0.06%, Zr 0.03%~0.05%, Ni≤0.15%, Mo≤0.12%, Ca: 0.0012%~0.0035%, Mo+Ni+Cr +Cu: 0.55%~0.85%, while the carbon equivalent Ceq is controlled at 0.37%~0.43%, and Ceq=C+Mn / 6+(Cr+Mo) / 5+(Ni+Cu) / 15; Pcm is controlled at 0.15 %~0.17%, and Pcm=C+Si / 30+(Mn+Cu+Cr) / 20+Ni / 60+Mo / 15+V / 10+5B; the balance is Fe and unavoidable impurities. O≤0.0050%, the total amount of other impurity elements is less than 0.05%.

[0031] The metallographic structure of the steel plate is a multi-phase structure mainly composed of acicular ferrite and granular bainite; wherein, ...