Processing parameters of die steel, tempering process of high carbon low alloy steel

模具钢加工参数，由高碳低合金钢制成的模具通常在较低的温度(120-200℃)下回火，当需要较高的弹性时，回火温度可以提高到300-350℃。

Processing parameters of die steel: dies made of high carbon and low alloy steel are usually tempered at a lower temperature (120-200 ℃). When higher elasticity is required, the tempering temperature can be increased to 300-350 ℃.

150-1800℃回火时间通常为60，足以残余应力。如果在120-2000℃下回火，时间应延长6-12小时。为了防止模具因淬火应力而开裂，模具应在淬火后立即回火。

The tempering time of 150-1800 ℃ is usually 60, which is enough to eliminate the residual stress. If tempered at 120-2000 ℃, the time shall be extended to 6-12 hours. In order to prevent the die from cracking due to quenching stress, the die shall be tempered immediately after quenching.

在低温回火时，由于部分马氏体的分解，模具的硬度一般会稍微降低1-3hr c，钢中的合金元素对这一阶段的回火过程基本没有影响，只有硅(含量在。8-1.0)可以在更高的温度(20。3000℃)防止马氏体进一步分解，因此含硅钢加热到250-270℃回火后，硬度仍能保持在6OHRC。

During low-temperature tempering, due to the decomposition of some martensite, the hardness of the die will generally be slightly reduced by 1-3hr C. the alloy elements in the steel basically have no effect on the tempering process at this stage. Only silicon (with a content of. 8-1.0) can prevent the further decomposition of martensite at a higher temperature (20.3000 ℃). Therefore, the hardness of silicon containing steel can still be maintained at 6ohrc after being heated to 250-270 ℃ for tempering.

对于要求耐磨的模具，回火温度一般不超过200℃。

For moulds requiring wear resistance, the tempering temperature shall not exceed 200 ℃.

对于软金属或成型模具，可采用200-240℃回火。

For soft metals or forming molds, tempering at 200-240 ℃ can be adopted.

回火时间对高碳低合金钢硬度的变化趋势基本一致，即回火保温时间越长，硬度略低，因此回火时间一般为2-4h，对于一些大型模具，可适当延长回火时间。

The change trend of tempering time on the hardness of high carbon low alloy steel is basically the same, that is, the longer the tempering holding time, the lower the hardness. Therefore, the tempering time is generally 2-4h. For some large molds, the tempering time can be appropriately extended.

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