High performance hot work mould steel

Abstract

This high performance hot-work die steel accounting for weight has following chemical composition: C: 0.70-1.98,Si:0.30-1.50,Mn:0.20-0.70,Cr:0.80-2.00,W:0.80- 1.40,Mo:1.00-1.80,Ni:1.00-3.00,V:0.30-1.20,Bi:0.01-0.02,rare earth Si and Mg:0.05-0.08,P<0.03,S<0.03, the rest is Fe and inevitable impurity. The HRC hardness of it can be adjust by need from 20-60 degree, through the way of heat treatment such as annealing and quenching. The invention has enough mechanical strength and toughness, super ordinary thermal oxidation resistance and cold-heat impact resistance, heat resistance, wear resistance, and aluminium liquid resistance. After process into die, not need surface treatment of 'nitriding', just need quenching and tempering for needed hardness.

Description

technical field [0001] The invention relates to a hot work die steel, in particular to a high-performance hot work die steel suitable for making aluminum material hot extrusion dies, aluminum alloy liquid hot press casting dies and steel hot forging dies. Background technique [0002] In modern large-scale industrial production, especially in the production and manufacture of aluminum alloy hot extrusion materials, aluminum alloy hot die-casting parts for automobiles and motorcycles, hot forging steel parts, etc., a large amount of special-purpose equipment must be used and consumed. Mold and alloy steel materials. At present, these molds are all made of high-quality alloy steel materials such as 4Cr5MoSiV (commonly known as "H13 steel") and 3Cr2W8V and other mold steels. They generally go through processes such as billet forging, annealing, machining, quenching, tempering, finishing, "nitriding" surface hardening heat treatment, etc., before they can be put into production...

AI Technical Summary

Problems solved by technology

During the cooling process, the mold cannot be cooled quickly by spraying water, because if the cooling is too fast and too fast, it is easy to cause cracks in the mold and be scrapped

At the same time, after this kind of hot forging die generally forges hundreds of parts, "cracks" will appear on the inner surface of the cavity. If it continues to be used, such small cracks will soon become larger and can no longer be used.

Although the cracked cavity can be removed by deep milling, but the deep milling makes the cavity mold thinner and thinner, and finally scrapped and cannot be used

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