A2
OtherA2
Hot-work tool steel. (YB/T 5301; equiv ASTM A681 / DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.95 |
|---|---|
| CR | 4.75 |
| MO | 0.9 |
| V | 0.15 |
| MN | 0.3 |
| SI | 0.1 |
| P | 0.03 |
| S | 0.03 |
Mechanical Properties
Hardness(annealed):≤241 HB;Hardness(hardened):57-62 HRC
Chinese Standard
T 5301 A2
Equivalent Standards
ASTM A681
Equivalent Grades
DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1
Applications
热作模具钢。,"Bar
Available Forms
Block"
Uses
High-carbon chromium bearing steel for rolling-element bearings, races and precision balls/rollers. Combines high hardness, fatigue life and dimensional stability; also used for gauges, needles and wear parts.
Heat Treatment
Spheroidize anneal (760–780 °C), austenitize 830–860 °C oil quench, temper 150–180 °C to 60–66 HRC; stabilising treatments improve dimensional stability.
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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