Steel Grade AISI 4340
4340 is a highly alloyed steel with high nickel and chromium content which assures deep hardening when oil quenched, with high strength characteristics throughout the section. Used for heavily stressed parts operating under strenuous conditions.
Typical Chemical Analysis
| Carbon | 0.38 - 0.43% |
| Managnese | 0.60 - 0.80% |
| Phosphorous | 0.035% max |
| Sulfur | 0.040% max |
| Silicon | 0.15 - 0.35% |
| Molybdenum | 0.20 - 0.30% |
| Chromium | 0.70 - 0.90% |
Typical Mechanical Properties
| Tensile strength (ksi) | 150 |
| Yield strength (ksi) | 140 |
| Elongation (% in 2") | 20 |
| Brinell | 307 |
| Rockwell | C31 |
Hot Rolled - HTSR Heat Treated, Stress Relieved
-
Round
Size Range:
1" to 9” diameter
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