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以硅锰作为主加元素,对低碳贝氏体钢进行合金化。采用逐步回归法得出了常规性能与化学成分的关系式,定量地指出了合金元素对性能的影响。该钢空冷后的组织为粒状贝氏体和准贝氏体(即在铁素体板条间存在稳定的残余奥氏体膜或M—A岛),与粒状组织相比,具有较高的强韧性。试验和试生产表明,用该钢制成的大截面零件(φ200×900mn),经锻造后在空气中冷却即可获得良好的强韧性,且在较宽的冷速范围内性能稳定,是一种生产工艺简便、可以代替调质钢、提高经济效益的新型钢种。
Silicon and manganese as the main plus elements, low carbon bainitic steel alloyed. Stepwise regression method was used to derive the relationship between the conventional properties and chemical composition, quantitatively pointed out that alloying elements on the performance. The air-cooled structure of the steel is granular bainite and quasi-bainite (ie, a stable retained austenite film or M-A island exists between the ferrite slats), and has a higher Toughness. Test and trial production show that the steel with a large cross-section parts (φ200 × 900mn), after forging in the air cooling to get good toughness, and in a wide range of cooling speed performance is stable, is a The production process is simple, you can replace the quenched and tempered steel, improve economic efficiency of the new steel.