Wide-width, high-strength, high-toughness and thick-wall X80M pipeline steel plate and manufacturing method thereof
A high-strength toughness, manufacturing method technology, applied to wide-width high-strength toughness thick-walled X80M pipeline steel plate and its manufacturing field, can solve the problems of poor uniformity of steel plate performance, high rolling resistance, large straightening resistance, etc., to improve composition uniformity , Improve plastic toughness, low yield ratio effect
Active Publication Date: 2021-06-18
ANGANG STEEL CO LTD
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Problems solved by technology
[0007] The invention provides a wide-width high-strength toughness thick-walled X80M pipeline steel plate and its manufacturing method. The pipelines for oil and gas transportation can meet the technical requirements of ultra-wide X80M steel plates without subsequent off-line heat treatment and stacking and slow cooling, and solve the problems of high rolling resistance, high straightening resistance and poor uniformity of steel plates in the production process. The steel plate has high The comprehensive properties of strength and low temperature toughness can ensure the safety of oil and gas pipelines
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[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, ...
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The invention relates to a wide-width, high-strength, high-toughness and thick-wall X80M pipeline steel plate and a manufacturing method thereof. The steel plate is prepared from the chemical components including, by weight, 0.045%-0.08% of C, 0.20%-0.38% of Si, 1.55%-1.85% of Mn, 0.15%-0.35% of Cu, less than or equal to 0.010% of P, less than or equal to 0.015% of S, 0.04%-0.08% of Nb, 0.015%-0.028% of Ti, 0.015%-0.045% of Al, 0.25%-0.5% of Cr, 0.004%-0.006% of N, 0.032%-0.06% of V, 0.03%-0.05% of Zr, less than or equal to 0.15% of Ni, less than or equal to 0.12% of Mo, 0.0012%-0.0035% of Ca and the balance Fe and inevitable impurities. The produced steel plate has the comprehensive performance of high strength and good low-temperature toughness, and can ensure the safety of oil and gas transmission pipelines.
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...
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Login to View More IPC IPC(8): C22C38/02C22C38/38C22C38/20C22C38/26C22C38/28C22C38/06C22C38/24C22C38/22C22C38/58C22C38/42C22C38/48C22C38/50C22C38/46C22C38/44C22C33/04C21D8/02
CPCC22C38/02C22C38/38C22C38/20C22C38/26C22C38/28C22C38/06C22C38/24C22C38/22C22C38/58C22C38/42C22C38/48C22C38/50C22C38/46C22C38/44C22C33/04C21D8/0226C21D2211/005C21D2211/002
Inventor 徐海健沙孝春任毅姚震张帅康超应传涛渠秀娟
Owner ANGANG STEEL CO LTD