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发明公开
CN103014488A 合金压铸用模具钢及其加工工艺 失效 - 权利终止

合金压铸用模具钢及其加工工艺
摘要：
本发明公开了一种合金压铸用模具钢及其加工工艺，该模具钢中各化学组分的重量百分比为：C 0.30-0.50%、Si 0.20-0.40%、Mn 0.3-0.60%、Cr 0.50-0.80%、W 1.20-1.50%、Mo 2.20-2.60%、V 0.50-0.70%、Nb 0.06-0.08%、Y 0.03-0.05%、Ce 0.03-0.04%、P≤0.020%、S≤0.020%，余量为铁和杂质。本发明采用稀土元素Ce、Y进行变质处理，模具钢的奥氏体晶粒明显细化，碳化物断网团絮化，改善了钢的强度、韧性等其它力学性能。本发明采用了合理的热处理工艺，合适的退火处理以及采用低淬低回的方式，使模具钢的硬度性能和耐冲击性能都有显著提高。本发明的合金压铸用模具钢与现有的压铸模具钢相比，具有更高的耐磨性、强度、韧性以及抗回火稳定性。
摘要（英）：

The invention discloses a die steel for alloy compression casting and a processing method thereof. The die steel comprises the following chemical components by weight percent: 0.30-0.50% of C, 0.20-0.40% of Si, 0.3-0.60% of Mn, 0.50-0.80% of Cr, 1.20-1.50% of W, 2.20-2.60% of Mo, 0.50-0.70% of V, 0.06-0.08% of Nb, 0.03-0.05% of Y, 0.03-0.04% of Ce, smaller than or equal to 0.020% of P, smaller than or equal to 0.020% of S, and the balance of iron and impurities. According to the invention, the rare earth elements Ce and Y are adopted for modification treatment, so that austenite grains of the die steel are obviously refined, and the carbide is broken networked and becomes flocs, thus improving the strength, tenacity and other mechanical properties of the steel. The invention adopts a reasonable heating treatment process and appropriate annealing treatment, and adopts a low-quenching low-tempering way, so that the hardness property and impact resistance property of the die steel are both significantly improved. Compared with the existing compression-casting die steel, the die steel for alloy compression casting has higher wear resistance, strength, tenacity and temper resistance.

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