4140 Annealed (LPA) Cold Drawn Steel Bar
Annealed, cold drawn 4140 steel bar is a medium carbon, chromium-molybdenum steel with high hardenability. It is softened from the mill structure, to a pearlite structure, prior to cold drawing. This improves the ductility and can help improve machinability. Eaton Steel Bar Company stocks many diameters of 4140 LPA cold drawn steel to meet the market demand. ASTM specifications are generally applicable for cold drawn 4140 LPA steel bars. We supply 4140 LPA CD Steel Bar to industries such as automotive, aerospace, Oil & Gas, and more.
Applications
Typical applications for this grade of steel include:
- Bolts
- Shafts
- Gears
- Couplings
- Tools
Requirements
Eaton Steel Bar Company can meet the following specifications for this grade:
- ASTM A108
- ASTM A322
- JDM QL-2 certified
Shapes and Sizes
Eaton Steel Bar Company supplies 4140 LPA cold drawn steel bar in a variety of sizes ranging from – 5/6”-6”. The shapes available for this grade include:
***Minimum Total Quantity Per Order is 10,000 lbs.***
Standard "4140 Annealed (LPA) 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 |
| Chromium | 0.80-1.10 |
| Molybdenum | 0.15-0.25 |
Estimated Mechanical Property Ranges for "Grade 4140 Annealed"
| Tensile strength (psi) | 95,000 - 105,000 |
| Yield strength (psi) | 85,000 - 95,000 |
| Elongation in 2" (%) | 15 - 25 |
| Reduction of area (%) | 50 - 60 |
| Brinell Hardness (BHN) | 200 - 230 |
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