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日本钢铁公司君津千叶实验室试验了一种生产80kg/mm~2级热轧薄板控制冷却方法。此种技术可归述为:1.控制冷却和降低卷取温度以改善组织达到强化效果;2.减少 P 和S 含量改善加工和焊接性能,同时添入 Ca来控制硫化物的形态。试验钢不含有沉淀硬化元素,其成份为(重量%):0.18C,0.58Si,1.57Mn,0.01P,0.001S,0.024Al,0.002Ca。该钢经 LD 法精炼、加热温度1100℃、热轧至2.9mm 厚,终轧温度控制在775℃～875℃,热轧后经辊道直接进入淬火段,卷取温度为150℃～600℃(可由淬火终了温度调整)。
Japanese steel company Junjin Chiba laboratory test a production of 80kg / mm ~ 2 hot-rolled sheet control cooling method. This technique can be recalled as follows: 1. Control of cooling and coiling temperature to improve the organization to achieve the strengthening effect; 2. To reduce the P and S content to improve processing and welding performance, while adding Ca to control the morphology of the sulfide. The test steel does not contain precipitation hardening elements and has the composition (wt%): 0.18C, 0.58Si, 1.57Mn, 0.01P, 0.001S, 0.024Al, 0.002Ca. The steel was refined by LD method, the heating temperature was 1100 ℃, hot rolled to 2.9mm thick, finishing temperature controlled at 775 ℃ ~ 875 ℃, hot rolled directly into the quenching stage through the roller, the coiling temperature of 150 ℃ ~ 600 ℃ (Adjustable by quenching temperature).