Ultra-thick specification high toughness x100 ultra-high steel grade pipeline steel plate and preparation method thereof
A high toughness, thick specification technology, applied in the field of X100 pipeline steel sheet and its preparation, can solve the problems of poor DWTT performance, achieve excellent low temperature toughness, refine grains, and improve yield.
Active Publication Date: 2021-06-18
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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Therefore, the X100 obtained by the composition and process involved in the patent is lower bainite, so the DWTT performance is poor in the thick specification. According to the published data, the thickest specification is 22mm
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[0038] Below in conjunction with embodiment the present invention is described in further detail.
[0039] The manufacturing process of thick gauge X100 pipeline steel plate with excellent ultra-low temperature drop weight performance is: material preparation → converter or electric furnace smelting → out-of-furnace refining → continuous casting → slab reheating → specific TMCP process + stack cooling after cooling → straightening.
[0040] The specific process steps are as follows: the smelted raw materials are sequentially subjected to KR molten iron pretreatment, converter smelting, LF refining, RH vacuum refining and continuous casting. The continuous casting adopts a soft reduction process, the purpose of which is to improve the core segregation caused by the high Mn content . Manufacture a continuous casting slab that meets the chemical composition requirements and has a thickness of 350mm; reheat the continuous casting slab to 1180-1200°C, and perform a specific TMCP pr...
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Abstract
The present invention specifically relates to high-toughness X100 ultra-high-grade pipeline steel plates with a thickness of more than 25 mm, the chemical composition of which is C≤0.08%, Mn0.9-2.0%, Si≤0.35%, S≤0.0006%, P≤0.010% , Nb0.035~0.08%, Ti≤0.012%, V≤0.008%, Alt≤0.06%, N≤0.0040%, O≤0.004%, Mo≤0.40%, Pb≤0.0015%, Zn≤0.003%, Sb≤ 0.0015%, Sn≤0.0015%, Cu≤0.30%, Ni0.20~1.5%, Cr≤0.35%, Mo+Cu+Ni+Cr≤1.8%, Ca≤0.01%, and the balance is Fe. Manufacturing process: Proportioning and preparing materials → smelting in converter or electric furnace → refining outside the furnace → continuous casting → slab reheating → specific TMCP process + stack cooling after cooling → straightening. This application adopts suitable ingredients to produce X100 with a thickness of more than 25mm, and with the subsequent specific TMCP process (including intermediate billet cooling + ACC stepwise gradient cooling process), excellent low temperature toughness and low temperature drop weight are obtained.
Description
technical field [0001] The invention relates to a steel plate for X100 pipelines and a preparation method thereof, in particular to a high-toughness steel plate for X100 ultra-high steel grade pipelines with a thickness of more than 25 mm and a production method thereof. Background technique [0002] At present, fossil energy still occupies a dominant position in the energy structure in the energy demanded by the world. The rapid growth of the world economy in recent years has greatly driven the rapid growth of fossil energy demand, which has also greatly promoted the development of long-distance transmission pipelines. Transmission efficiency, lower investment, and the development trend of steel for long-distance oil and gas pipelines is to develop towards high-strength or ultra-high steel grades. At present, the highest steel grade of pipeline steel used in various countries in the world is X80 steel grade. In order to promote the development of pipeline steel technology a...
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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/08C22C38/14C22C38/16C22C38/06C22C38/58C22C38/48C22C38/50C22C38/46C22C38/42C22C38/44C21D8/02
CPCC21D8/0226C21D8/0263C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 蒋昌林高助忠诸建阳林涛吴小林李科胡建国
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD