4Cr5W2SiV
Other4Cr5W2SiV
High-C high-Cr cold-work tool steel. (GB/T 1299; equiv GB Cr12 / DIN 1.2080 / JIS SKD1). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.35 |
|---|---|
| SI | 0.8 |
| MN | 0.4 |
| CR | 4.5 |
| W | 1.6 |
| V | 0.6 |
| P | 0.03 |
| S | 0.03 |
Mechanical Properties
Hardness(annealed):≤229 HB;Hardness(hardened):48-52 HRC
Chinese Standard
T 1299 4Cr5W2SiV
Equivalent Grades
GB Cr12 / DIN 1.2080 / JIS SKD1
Applications
高碳高铬冷作模具钢。,"Bar
Available Forms
Block"
Uses
Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈2%/0%) give hot hardness and red-hardness for high-speed and hot-work tools. High chromium (≈5%) provides wear resistance and secondary hardening. Applied to blanks, punches, extrusion dies, shear blades, plastic-mold and cold-work tooling.
Heat Treatment
Powder/HSS: preheat 800–850 °C, austenitize 1180–1230 °C (salt or vacuum), quench, triple temper 540–570 °C to ≈64–66 HRC.
Precautions
Risk of quench cracking and distortion — use graded preheating, controlled cooling and multiple tempers. Avoid overheating the austenitizing temperature. Machine in the soft annealed condition; allow for dimensional change after heat treatment. Grind with coolant to prevent rehardening cracks.
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