布鲁斯建议：热作模具钢包括锻压、热挤压和压铸模具钢。
Bruce suggested: hot die steel including forging, hot extrusion and die-casting of steel.
热作模具锻造中，除上述热作压铸模具钢外，磨耗及热负荷大的模具常采用铸型锋钢。
Hot die forging, in addition to the hot work die steel casting, the wear and heat load large front steel casting mold is often used.
问题：压铸模具表面主要面临的问题有热冲击、磨损、液态合金与模具钢的化学反应等。
Problems: the primary stress to which the surface of the mould is exposed are thermal shock, abrasion and chemical reactions between the liquid alloy and the iron in the steel mould.
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