55CrSiA
Alloy Steel55CrSiA / A21553
55CrSiA grade supplied by Shanxi Youte Steel (jlhsteel.net).
Chemical Composition (%)
| C | 0.5 |
|---|---|
| SI | 1.2 |
| MN | 0.5 |
| P | 0.03 |
| S | 0.03 |
| CR | 0.5 |
| NI | 0.25 |
| CU | 0.2 |
Available Forms
Bar, Plate, Tube, Forging, Wire
Uses
Spring steel with high elastic limit and fatigue strength for coils, leaf springs, clips and suspension parts. Silicon (≈1.4%) raises elastic limit and tempering resistance. Supplied as strip, wire and bar; shot-peened after forming for longer service life.
Heat Treatment
Austenitize 830–880 °C (oil quench) and temper at 400–520 °C; stress-relieve formed springs at 230–320 °C after coiling.
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). Shot-peen after coiling to improve fatigue life; avoid sharp bends and surface defects.
Comments 0