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连铸坯直接轧制生产特厚钢板时,由于压缩比的限制,很难生产出厚度超过100 mm的高质量钢板。采用复合轧制工艺可生产出厚度为260 mm的SM45复合钢板。对钢板进行探伤、冷弯、拉伸、冲击及硬度等试验检验其结合度和力学性能。结果表明,复合轧制生产的SM45钢板结合度良好,未发现明显的缺陷存在。钢板复合界面与基体的强度均在600 MPa以上;Z向试样的强度也达到600 MPa以上,断面收缩率在30%以上;冲击功在37 J以上。钢板不同位置处的基本组织都为铁素体与珠光体,但晶粒尺寸不同。复合界面处的组织为一条铁素体为主的带状组织,该组织的产生是由先共析铁素体导致的。
In the case of direct rolling of slabs for producing thick steel plates, it is difficult to produce high-quality steel plates with a thickness exceeding 100 mm due to the compression ratio. The SM45 composite steel sheet with a thickness of 260 mm can be produced by the compound rolling process. The steel flaw detection, cold bending, tensile, impact and hardness tests to test its degree of bonding and mechanical properties. The results show that the SM45 steel produced by the composite rolling has a good degree of bonding and no obvious defects are found. The strength of the composite interface and the substrate of the steel plate are both above 600 MPa; the strength of the Z-direction sample reaches over 600 MPa, the reduction of area is above 30%; the impact energy is above 37 J. The basic structure of steel plate at different locations are ferrite and pearlite, but the grain size is different. The organization at the composite interface is a ferrite-based ribbon that is produced by pro-eutectoid ferrite.