Die Steel

The die material is relevant directly to the die life as well as die cost. Recently, the common

Ised die steel for cold blanking is as follows:

The carbon tool steel T8A, TIOA, T12A are the cheapest and the most widely used hardness after annealing is lower than that of the alloy steel. It has good machining property, and the process of forging, annealing and quenching is easy to mastered. It suitable to manufacture the working parts of the blanking die with small size and simple shape. But its hardenability and abrasion-resistant are bad, its quench distortion is large and its working life is short.

The low alloy tool steel, such as CrWMn, 9 CrSi, 9Mn2V etc, can be quenched by oil therefore it has a good hardenability and a small quench distortion. Comparing with T10A 9Mn2V has a higher hardness and abrasion-resistance, and also has a good machining property.

High-carbon high-chrome die steel, such as Crl2, Crl2Mo, Crl2MoV etc, has a high strength, good hardenability and abrasion-resistance and small quench distortion. The carbon content of Crl2 is a bit higher. The distribution of carbide is nonuniform severely, which results in a decrease in the strength as well as hardness.

High-carbon medium-chrome die steel includes Cr6WV, Cr4 W2MoV etc. Cr6WV is advantageous in small chrome content, better strength and impact toughness as compared with Crl2. Due to the small content of carbon and chrome, its abrasion-resistance and hardenability is not as good as Crl2, but its quench distortion is small. Its life expectancy is almost the same as Crl2. Cr4W2MoV is a new brand of die steel for cold forming to substitute Crl2. As compared with Crl2. it is characterized in finer size and more uniform distribution of eutectic carbide therefore its hardenability, hardening-quenching capacity, mechanical property and abrasion-resistance are a bit higher. The alloy elements, such as W, Mo and V etc, improve the stability of the steel and make the die undergoing possible, chemical heat treatment possible.