40SiMnVBE
Alloy Steel40SiMnVBE / A77406
40SiMnVBE grade supplied by Shanxi Youte Steel (jlhsteel.net).
Chemical Composition (%)
| C | 0.39 |
|---|---|
| SI | 0.9 |
| MN | 1.2 |
| P | 0.02 |
| S | 0.012 |
| NI | 0.35 |
| CU | 0.25 |
| V | 0.09 |
Available Forms
Bar, Plate, Tube, Forging, Wire
Uses
Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Nickel (≈0.35%) increases toughness and impact strength at low temperature. Vanadium (≈0.105%) 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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