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CN105886912B 一种低压缩比厚规格X70级输气管线钢及生产方法 有权 转让

一种低压缩比厚规格X70级输气管线钢及生产方法
摘要：
一种低压缩比厚规格X70级输气管线钢，其组分及wt%为：C：0.03‑0.075%、Si:0.15~0.35%、Mn:1.30~1.90%、P：≤0.015%、S：≤0.002%、N：≤0.006%、Nb：0.035~0.065%、V：0.025~0.05%、Ti:0.015~0.025%、Cr:0.1~0.40%、Ni：0.1~0.2%、Mo：0.10~0.25%。生产步骤：对厚度为225‑235mm的铸坯加热；粗轧；高压水除鳞；精轧；冷却；矫直，待用。本发明用连铸坯厚度为230mm的连铸坯能生产厚度为30mm及以上的X70级管线钢，且产品的Rt0.5在500~580MPa，Rm在600~650MPa，Rt0.5/Rm≤0.90，延伸率A50≥24%；‑20℃ 冲击功KV2≥250J，‑15℃ DWTT断面剪切率SA≥95%；HV10≤235。
摘要（英）：

Low-compression-ratio and thick-specification X70-grade gas transmission pipeline steel is prepared from, by weight percent, 0.03-0.075% of C, 0.15-0.35% of Si, 1.30-1.90% of Mn, not larger than 0.015% of P, not larger than 0.002% of S, not larger than 0.006% of N, 0.035-0.065% of Nb, 0.025-0.05% of V, 0.015-0.025% of Ti, 0.1-0.40% of Cr, 0.1-0.2% of Ni and 0.10-0.25% of Mo. Production steps include heating of casting blanks with the thickness ranging from 225 mm to 235 mm, rough rolling, high-pressure water descaling, fine rolling, cooling, straightening and standby application. According to the low-compression-ratio and thick-specification X70-grade gas transmission pipeline steel, the X70-grade pipeline steel with the thickness being 30 mm or above can be produced through the continuous casting blanks with the thickness being 230 mm, the Rt0.5 of the product ranges from 500 MPa to 580 MPa, the Rm of the product ranges from 600 MPa to 650 MPa, the ratio of the Rt0.5 to the Rm is not larger than 0.90, and the elongation A50 is not smaller than 24%; at -20 DEG C, the impact energy KV2 is not smaller than 250 J; at -15 DEG C, the DWTT fracture surface shear rate SA is not smaller than 95%; and HV10 <=235.

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