07Cr2MoW2VNbB
Alloy Steel07Cr2MoW2VNbB
Chinese GB creep-resistant steel for power plant.
Chemical Composition (%)
| C | 0.04 |
|---|---|
| SI | 0.5 |
| MN | 0.3 |
| CR | 1.9 |
| MO | 0.9 |
| W | 1.5 |
| V | 0.2 |
| NB | 0.02 |
| B | 0.0005 |
| P | 0.02 |
| S | 0.01 |
Applications
High-end / niche grade used in aerospace, defense, tooling, bearing, gear or heavy shaft applications.
Available Forms
Bar, plate, sheet, tube, forgings, strip, wire, powder
Uses
Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈1.75%/1.1%) give hot hardness and red-hardness for high-speed and hot-work tools. High chromium (≈2.25%) 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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