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Hot forging die steel analysis.

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Hot forging die steel analysis.

Release date:2016-04-04 00:00 source:http://www.zjmjg.com Click:

Forging die steel


Hot forging die steel to make up for 5 crmnmo and 5 crnimo in larger section and higher temperature, thermal stability, thermal fatigue resistance and hardenability insufficient defects, developed within 45 cr2nimovsi (hereinafter referred to as 45 cr2), 5 cr2nimovsi cr2mowvni (hereinafter referred to as 5 cr2) and 3, 3 cr2movni code (B2), and other large cross-section hot forging die steel. Compared with 5 crnimo, 45 cr2 and 5 cr2 contains both high Cr and Mo, and added a small amount of V, made the transition zone of high temperature on the CCT curve move up, low temperature transition zone significant moves to the right, to improve the hardenability of steel. Section size in 500 * 500 mm below the mold after the 970-990 ℃ quenching, 650 ~ 680 ℃ after tempering, the hardness of HRC36-44. 45 cr2 and 5 cr2 also have secondary hardening ability, which is 50% higher than 5 crnimo steel, high temperature strength of 100 ~ 150 ℃ higher thermal stability, impact toughness are. In addition, the steel thermal wear resistance and thermal fatigue resistance and thermal crack propagation is stronger than the capacity of the 5 crnimo. These two steel used for mechanical press mould and 16 under 12000 t t the following forging mould, the service life of the mold is made of the same 5 crnimo steel die life many times. 

 

Surface temperature can reach 600 ℃ or above, more than 5 crmnmo and high temperature properties of the 5 crnimo obviously can not meet the requirements. 3 cr2wsv steel high temperature strength is higher, but toughness and thermal fatigue resistance is poor. Therefore, domestic earlier developed 2 cr3mo3vnb, 4 cr3mo2mnvb (such as code ER8) 3% 3% Cr - 3% Mo and Cr - 2% Mo type of carbon chrome steel, high strength in three cr3mo3vnb is according to the form needed for the alloy carbide carbon 2 cr3mo3vnb further composition adjustment. These two steel added Mo by around 3%, which can improve the hardenability of steel and prevent the temper brittleness, and can improve the thermal stability of steel. Add V and Nb can rise to refine the grain size, lower steel overheating sensitivity function. Steel hardenability of the high quenching heating temperature, therefore, a wide range, overheating sensitivity low and high temperature and high strength, good thermal stability and plasticity toughness good, cold and hot fatigue performance is good, thermal wear performance is good wait for an advantage, such as used in the manufacture of stainless steel (2 crl3) hot forging die, die and roller bearing forging die, hot forging die steel has achieved good using effect. 


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