C carbon chromium Cr
W tungsten
Mn Manganese
Si Si
V V
0.95
0.5
0.5
1.1
0.3
0.1
Steel Features:
This steel has been heat-treated, uniform hardness, up 278-311HB, 29-33HRC, made mold will never change, excellent cutting and polishing performance for electrical erosion operation, can be used for flame hardened, chrome plated and nitriding.
Factory specifications: Pre-hardened to 950-1050N / mm2 (29-33HRC).
Purpose: all size plastic molds, and can be used for tin, lead, zinc alloy die-casting mold of the mold base.
Forged: 1050-850 ℃ furnace cooling.
Back to the matter: 850-900 ℃ furnace cooling.
Stress relief: After the heat evenly, stay cool in the oven for 1-2 hours.
Quenching: oil 840-860 ℃ or air: 860-880 ℃. Stay for at least 10 minutes, and the thickness of 20mm, see more than half minutes per 1mm, so that hardness of about 54HRC.
Tempering: tempering stay at least 1 hour, 20mm thick and more than 20mm each will have more than one hour
