We manufacture forging ingots, billets, and blooms in carbon steel specifically for SAE 1140, designed for medium to high strength engineering applications.
SAE 1140 is a medium carbon, high manganese steel that offers good strength, improved hardenability, and excellent machinability compared to standard plain carbon steels. The elevated manganese content helps achieve better response to heat treatment and more uniform mechanical properties.
This grade is widely used in automotive, general engineering, and machined components where a balance of strength, toughness, and cost-effectiveness is required.
| Element | Content (%) | Function / effect |
| Carbon (c) | 0.37 – 0.44 | Provides strength, hardness, and wear resistance |
| Manganese (mn) | 1.35 – 1.65 | Improves hardenability and toughness |
| Silicon (si) | 0.15 – 0.35 | Enhances strength and elasticity |
| Phosphorus (p) | Max 0.040 | Controlled to maintain toughness |
| Sulphur (s) | 0.040 – 0.060 | Improves machinability |
(properties may vary with section size and heat treatment)
SAE 1140 Is Ideal For Applications Requiring High Machining Efficiency Along With Moderate Strength. Its Resulphurized Composition Allows Faster Machining Speeds, Improved Surface Finish, And Reduced Production Costs. It Is Especially Suitable For Large-Scale Manufacturing Of Precision Components.
| Grade | Carbon (%) | Manganese (%) | Key difference |
| SAE 1040 | 0.37 – 0.44 | 0.60 – 0.90 | Lower mn, lower hardenability |
| SAE 1140 | 0.37 – 0.44 | 1.35 – 1.65 | Higher mn, better strength |
| SAE 1144 | ~0.44 | ~1.50 | Resulfurized, higher machinability |
| En 1.1165 (c40e) | ~0.40 | ~0.70 | Lower mn european grade |
SAE 1140 is a robust medium carbon, high manganese steel offering good strength, improved hardenability, and excellent machinability. It is an ideal choice for automotive and general engineering applications where consistent performance and cost-effective heat treatment response are essential.