3A21
Other3A21 / (LF21)
3A21 grade supplied by Shanxi Youte Steel (jlhsteel.net).
Chemical Composition (%)
| FE | 0.7 |
|---|---|
| SI | 0.6 |
| MN | 1 |
| CU | 0.2 |
| TI | 0.15 |
| MG | 0.05 |
Available Forms
Bar, Plate, Tube, Forging
Uses
Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.
Heat Treatment
Austenitize at 760–820 °C and quench (oil/water) then temper at 150–400 °C for high hardness; spheroidize anneal (680–720 °C) improves machinability of the as-rolled bar.
Precautions
Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating).
Comments 0