30Х3МФ
Alloy Steel30Х3МФ
Russian GOST Cr-Mo-V steel.
Chemical Composition (%)
| C | 0.27 |
|---|---|
| SI | 0.17 |
| MN | 0.3 |
| CR | 2.8 |
| MO | 0.35 |
| V | 0.1 |
| P | 0.025 |
| S | 0.025 |
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
Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈3.05%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.45%) raises high-temperature strength and prevents temper embrittlement. Vanadium (≈0.175%) refines grain and strengthens the tempered structure. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.
Heat Treatment
Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.
Precautions
Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating).
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