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西德Thyssen优质钢厂研制成功的Thyrotherm2799马氏体时效钢(maraging steel),含镍量较低,其性能较同类钢种更好,可代替H11、H13热模钢,它的时效温度为550～625℃,适用于制作锻造,挤压和铝合金压铸模等耐热模具。这种钢出厂时呈固溶退火状态,硬度为HRC32,加工完毕在550℃时效,硬度上升至HRC52,其屈服强度为1830N/mm~2(18300kgf/cm~2),而抗拉极限可达1970N/mm~2(19700kgf/cm~2)。倘在625℃时效,硬度将下降至HRC46,屈服强度降为1400N/mm~2(14000kgf/cm~2),而抗拉极限降为1690N/mm~2(16900kgf/cm~2)。该钢在工作温度650℃时仍有良好的抗热性,时效后的钢材收缩率为0.1％。最常见的马氏体时效钢,其成份为18％Ni;8～
The Thysenotherm2799 maraging steel developed by the West Germany Thyssen quality steel mill has lower nickel content and better performance than the steel of the same kind. It can replace the H11 and H13 hot-mold steels and its aging temperature is 550 ~ 625 ℃, suitable for making forging, extrusion and aluminum die-casting molds and other heat-resistant mold. The steel is in solution and annealed state at the time of delivery, with a hardness of HRC 32, aged at 550 ° C and hardness increased to HRC 52 with a yield strength of 1830 N / mm 2 (18 300 kgf / cm 2) and a tensile resistance of up to 1970N / mm ~ 2 (19700kgf / cm ~ 2). If aged at 625 ° C, the hardness will drop to HRC46 and the yield strength will drop to 1400 N / mm ~ 2 (14000 kgf / cm ~ 2) while the tensile limit will drop to 1690 N / mm ~ 2 (16900 kgf / cm ~ 2). The steel at the working temperature of 650 ℃ still has good heat resistance, after aging steel shrinkage of 0.1%. The most common martensitic steel, the composition of 18% Ni; 8 ~