A steel plate for q690 grade coal mine hydraulic support and its production method
A technology of coal mine hydraulic pressure and production method, applied in the field of iron and steel materials, can solve the problems of high carbon equivalent and poor welding performance, achieve high strength performance, good toughness and plastic performance and welding performance, and achieve the effect of innovative development
Active Publication Date: 2022-02-22
ANYANG IRON & STEEL +1
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Problems solved by technology
The traditional high-strength steel Q690 grade steel usually adopts quenching and tempering composition design and quenching + tempering production process, or adds NB, Mo, Cr and B microalloying elements, and adopts thermomechanical rolling + tempering process. The equivalent weight is high, which will easily lead to poor welding performance
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Embodiment 1
[0037] The product produced by the heat treatment production line of the steel coil rolling mill is an example of a high-strength steel plate for the coal mine hydraulic support of the 30mm specification Q690 level, and the present invention is further explained: the proportioning by weight percentage includes the following components: C: 0.059%, Si: 0.20 %, Mn: 1.62%, P: 0.011%, S: 0.001%, Als: 0.024%, Cu: 0.19%, Cr: 0.93%, Ni: 0.20%, B: 0.0009%, Ti: 0.015%, and the balance is Fe and unavoidable impurities.
[0038] The process route mainly includes top-bottom combined blowing converter, LF refining, wide slab continuous casting, steckel mill rolling, heat treatment production line and other processes; the rolling process system is shown in Table 1 and Table 2.
[0039] Table 1 Rolling process system of steel plate for 30mmQ690 coal mine hydraulic support
[0040]
[0041] Table 2 Heat treatment process system of steel plate for 30mmQ690 coal mine hydraulic support
[00...
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Abstract
The invention relates to a high-strength steel plate for a Q690 grade coal mine hydraulic support, belonging to the technical field of iron and steel materials. The steel plate is proportioned by weight percentage, including the following components: C: 0.030-0.060%, Si: 0.15-0.30%, Mn: 1.60-1.70%, P: ≤0.020%, S: ≤0.015%, Cr: 0.80- 1.00%, Cu: 0.15‑0.25%, Ni: 0.15‑0.25%, Als: 0.015‑0.045%, Ti: 0.012‑0.025%, B: 0.0006‑0.0010%, and the balance is Fe and unavoidable impurities. The composition design of the high-strength steel plate for Q690 coal mine hydraulic support of the present invention only adds Cu, Ni, Cr and other alloying elements, does not contain Mo, Nb element content, and does not utilize the hardenability of B at the same time. The high-strength steel plate for coal mine hydraulic supports produced by the invention has the advantages of high strength, good toughness and plasticity, and excellent welding performance, and can meet the requirements of downstream users.
Description
technical field [0001] The invention relates to a high-strength Q690-grade steel plate for coal mine hydraulic support with high strength and excellent welding performance produced by a furnace coil to a heat treatment unit and a specific production process thereof, belonging to the technical field of iron and steel materials. Background technique [0002] Coal mine hydraulic support steel usually adopts Q460 grade or above steel plate, and with the development of large-scale coal mine machinery and equipment and heavy load, the strength level of high-strength steel is also increasing, and the market usage of Q690 grade steel plate is gradually increasing. The traditional high-strength steel Q690 grade steel usually adopts quenching and tempering composition design and quenching + tempering production process, or adds NB, Mo, Cr and B microalloying elements, and adopts thermomechanical rolling + tempering process. The equivalent weight is high, which will easily lead to poor...
Claims
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IPC IPC(8): C22C38/02C22C38/06C22C38/42C22C38/50C22C38/54C22C38/58C21D8/02C22C33/04
CPCC22C38/02C22C38/06C22C38/58C22C38/42C22C38/50C22C38/54C22C33/04C21D8/0205C21D8/0226C21D8/0263
Inventor 徐党委李勇韦弦黄重衣海龙孙斌陈尹泽宋立伟赵良生李娜何晓波
Owner ANYANG IRON & STEEL