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MS (Mild Steel) is a low carbon steel known for its excellent weldability, machinability, and ductility. It offers a good balance between toughness and strength, making it ideal for carburized parts where surface hardness and a soft core are desired. MS steel is often used in applications where alloy steels are not required due to its ease of forming, drilling, machining, and heat-treating properties.
MS mild/low carbon steel is widely used for general engineering purposes, including:
Mild Steel (MS) has equivalents in several international standards:
We offer a variety of steel grades alongside MS, including EN1A, EN8, EN9, EN24, EN31, 42CrMo4, HCHCR, D2, D3, H11, H13, SAE1018, and SAE4140.
| Element | C | Mn | P (max) | S (max) | Fe |
|---|---|---|---|---|---|
| % | 0.14-0.20 | 0.60-0.90 | ≤ 0.040 | ≤ 0.050 | 98.81-99.26 |
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength (Ultimate) | 440 MPa | 63,800 psi |
| Yield Strength | 370 MPa | 53,700 psi |
| Elongation at Break | 15% | 15% |
| Reduction of Area | 40% | 40% |
| Modulus of Elasticity | 205 GPa | 29,700 ksi |
| Hardness (Brinell) | 126 | 126 |
| Machinability | 70% (vs. AISI 1212) | 70% |
Brinell hardness: 126 HB
MS steel is commonly used in the as-forged condition, as its machinability is better in this state compared to the normalized condition. Quenching and tempering processes offer little benefit at this carbon content level.
To harden MS steel, heat it between 780°C – 820°C, then quench in water.
Tempering MS steel at 150°C – 200°C improves case toughness without significantly affecting hardness. This process also helps to reduce grinding cracks.
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.87 g/cm³ | 0.284 lb/in³ |
| Modulus of Elasticity | 205 GPa | 29,700 ksi |
| Property | Metric (T = 100°C) | Imperial (T = 100°F) |
|---|---|---|
| Thermal Conductivity | 51.9 W/m-K | 360 BTU/hr.ft².°F |
For forging, heat MS steel to 1150°C – 1280°C and hold until the temperature becomes uniform. Cool in the air after forging.
Heat MS steel to 500°C – 700°C to relieve internal stresses, then cool in air.
Heat the steel to 890°C – 940°C, then cool in still air to normalize.
Anneal MS steel by heating to 870°C – 910°C and allowing it to cool in a furnace.
MS steel offers 78% machinability relative to standard machinable grades like B1112.
MS mild steel can be welded by all conventional welding processes without the need for pre-heating or post-heating. However, for sections over 50mm, pre-heating may improve weld quality. For carburized or carbonitrided sections, welding is not recommended.
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Carbon Steel, Alloy Steel, Bright Steel, Spring Steel, Die Steel & Tool Steel, Special Alloy Steel
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