H13 tool steel imports, the implementation of standards GB/T1299-2000. Unified digital code A20502; grade 4Cr5MoSiV1; alloy tool steel alloy tool steel referred to, is working in the carbon steel alloying elements on the basis of the formation of steel. Impact load is mainly used for manufacturing large forging dies, hot extrusion mold, forging mold; aluminum, copper and its alloy die-casting mold. .
 
Chemical composition
C0.32 ~ 0.45, Si0.80 ~ 1.20,
 
Mn0.20 ~ 0.50,
 
Cr4.75 ~ 5.50,
 
Mo1.10 ~ 1.75,
 
V0.80 ~ 1.20,
 
p less than or equal 0.030,
 
S is less than equal to 0.030;
 
Heat treatment
Hardening: Preheat 790 degrees + -15 degrees
 
1000 degrees (salt) or 1010 degrees (oven controlled atmosphere) + -6 degrees heat
 
5 ~ 15min air-cooled heat
 
550 degrees + -6 degrees tempering annealing, thermal processing;
 
Feature
Weight capacity of electroslag steel, the steel has high hardenability and thermal cracking capacity, the steel contains a high content of carbon and vanadium, wear resistance, toughness relative weakened, has good heat resistance, in has good high temperature strength and hardness, high toughness, wear resistance, excellent mechanical properties and high resistance to tempering stability.
 
Use
A large impact load used in the manufacture forging die, hot extrusion, forging mold; aluminum, copper and its alloy die-casting mold.
 
Hardness analysis
Determine the carbon content in steel matrix hardness of hardened steel, carbon steel by quenching steel with hardness curves can know, H13 tool steel quenched hardness of 55HRC or so. In terms of tool steel, carbon steel part into the steel matrix solid solution strengthening caused. Another part of the carbon and alloying elements in the carbide forming elements combined into alloys carbide. Of hot die steel, this alloy in addition to a small amount of residual carbon, it also requires it to quench tempered martensite in the process of diffusion on the substrate produced two precipitation hardening. To the uniform distribution of the residual carbon compounds and alloys tempered martensite organization to determine the performance of hot work die steel.