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发明公开
CN102851613A 一种低成本高性能海洋隔水管用热轧钢板及其生产方法 有权

一种低成本高性能海洋隔水管用热轧钢板及其生产方法
摘要：
本发明公开一种低成本高性能海洋隔水管用热轧钢板及其生产方法，其化学成分组成为C：0.04％～0.10％、Si：0.10％～0.35％、Mn：1.55％～1.85％、Nb：0.02％～0.08％、Ti：0.008％～0.020％、Al：0.010％～0.040％、P≤0.020％、S≤0.003％、Mo＜0.20％、Cu≤0.25％、Ni≤0.30％、Cr≤0.25％、N≤0.008％、Al/N≥3、Ni+Cu+Mo+Cr≤0.70％、Nb+Ti≤0.09％、Ti/N：2.5～5，余量为铁和不可避免的杂质。CEIIW0.40％～0.45％、CEPCM0.16％～0.21％，铸坯的加热温度1160～1230℃，采用4阶段加热，粗轧980～1120℃，精轧790～900℃，轧后冷却温度750～800℃，冷却速度5～35℃/s，终冷温度430～520℃，本发明屈服强度555MPa以上，纵向抗拉强度630MPa以上，具有良好的抗断裂能力、抗腐蚀和抗疲劳性能，具备良好的综合性能，并可降低成本。
摘要（英）：

The invention discloses a hot-rolled steel plate for an ocean riser with low cost and high performance and a production method thereof. The chemical components of the steel plate comprise C 0.04-0.10%, Si 0.10-0.35%, Mn 1.55-1.85%, Nb 0.02-0.08%, Ti 0.008-0.020%, Al 0.010-0.040%, P less than or equal to 0.020%, S less than or equal to 0.003%, Mo less than 0.20%, Cu less than or equal to 0.25%, Ni less than or equal to 0.30%, Cr less than or equal to 0.25%, N less than or equal to 0.008%, and the balance being Fe and unavoidable impurities, wherein Al/N is greater than or equal to 3, Ni+Cu+Mo+Cr is less than or equal to 0.70%, Nb+Ti is less than or equal to 0.09%, and Ti/N is equal to 2.5-5. CEIIW is 0.40-0.45%, CEPCM is 0.16-0.21%, casting blank heating temperature is 1,160-1,230 DEG C, four-stage heating is adopted, rough rolling temperature is 980-1,120 DEG C, fine rolling temperature is 790-900 DEG C, cooling temperature after rolling is 750-800 DEG C, cooling speed is 5-35 DEG C/s, and final cooling temperature is 430-520 DEG C. The steel plate of the invention has yield strength above 555 MPa, endwise tensile strength above 630 MPa, good cracking resistance, corrosion resistance and fatigue resistance, good comprehensive property, and low cost.

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