H12 Tool Steel Bar Specification

ASTM/AISI H12 Steel is deep-hardening, air-hardening steel that exhibits minimal size change during heat treatment. H12 tool steel material has good resistance to thermal fatigue cracking (heat cracking) and excellent resistance to gross cracking and thermal shock when the water cooled in service.

• Magnificent Resistance to Wear
• High Strength at Elevated Temperature
• Homogenizing with High Toughness
• Additional Fine Structure without Grain-Boundary Carbide

Equivalent Grade

Chemical Composition ( in weight %)

Coefficient of Linear Thermal Expansion 10^-6℃^-1

Product Process:
Electric-Furnace Smelting(EF)→Ladle Furnace(LF)→Vacuum Degassing(VD)→ Argon protected ingot →Multidirectional Forging → (Concave forging →)Normalizing+Hydrogen Diffusion Annealing → Ultrasonic Flaw Detection →Queching+Tempering Prehardened

Machinability

75-80% of a 1% carbon steel.

Corrosion Resistance

Corrosion resistance of this alloy is better than that of plain carbon steels. However it will rust unless given protective treatment.

Steel Making

Ingot Production

Forged Bars

Machinary