8640 Hot Rolled SBQ Bar
Hot rolled 8640 steel is a medium-carbon, low alloy grade that contains nickel, chromium, and molybdenum. The carbon and alloy content supports induction case hardening, improving surface hardness and wear. Eaton Steel Bar Company stocks many diameters of 8640 hot rolled steel bars to meet the market demands. We supply AISI 8640 steel bars to various industries including oil & gas, automotive and military.
Applications
Typical applications for this grade of steel include:
- Forged Tools
- Gears
- Axles
- Crankshafts
- Firearm Components
8640 Hot Rolled Steel Bar Requirements
Eaton Steel Bar Company can meet the following specifications for this grade:
- ASTM A29
- ASTM A322
Shapes and Sizes
Eaton Steel Bar Company supplies 8640 steel bar in a variety of sizes ranging from 3/4”- 3”. The shapes available for this grade include:
- Rounds
- Rounded Cornered Square
***Minimum Total Quantity Per Order is 10,000 lbs.***
Standard "8640 Grade" Chemical Composition
| Carbon | 0.38-0.43 |
| Manganese | 0.75-1.00 |
| Phosphorus (max) | 0.035 |
| Sulfur (max) | 0.040 |
| Silicon | 0.15-0.35 |
| Nickel | 0.40-0.70 |
| Chromium | 0.40-0.60 |
| Molybdenum | 0.15-0.25 |
Estimated Mechanical Property Ranges for "Grade 8640"
| Tensile strength (psi) | 90,000 - 100,000 |
| Yield strength (psi) | 65,000 - 75,000 |
| Elongation in 2” (%) | 15 - 25 |
| Reduction of area (%) | 30 - 40 |
| Brinell Hardness (BHN) | 180 - 210 |
Interested in Eaton Steel's Hot Rolled Catalog?
Click here!
