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X120MN12 / SIDUR 3401 – High-Manganese Abrasion Resistant Steel
X120MN12 / SIDUR 3401 is a non-magnetic, abrasion-resistant steel known for its exceptional impact strength and high abrasion resistance. This grade of steel is widely used in applications that require resistance to wear and tear under high-impact conditions. In its work-hardened state, it can achieve a hardness of up to 600 HB. However, it is not resistant to corrosion and poses challenges in terms of machinability.
Chemical Composition of X120MN12:
X120Mn12 features a high carbon and manganese content, typically containing 1.00-1.20% carbon and approximately 12% manganese. Below is the standard chemical composition:
| Element | Percentage (%) |
|---|---|
| C | 1.30 |
| Si | 0.40 |
| Mn | 11.00 – 13.00 |
| P | 0.020 |
| S | 0.001 |
| Cr | 0.55 |
Specifications of X120MN12 / SIDUR 3401:
| Specification | Equivalent |
|---|---|
| X120Mn12 | 1.3401 |
| ASTM A128 Grade B2 | SIDUR 3401 |
| HADFIELD | 120Mn12 |
Applications of X120MN12 / SIDUR 3401:
This steel is ideal for use in industries where components are subjected to heavy wear and dynamic pressures. Common applications include:
- Railway components
- Shot blasting machine liner plates
- Recycling equipment
- Lifting equipment
- Security safes
- Dredger and crusher components
- Conveying machines
- Crushing jaws
- Impact wedges
- Linings
Mechanical Properties of X120MN12:
At ambient temperatures, the typical mechanical properties of X120Mn12 are as follows:
| Property | Value (N/mm²) |
|---|---|
| 0.2% Proof Stress | 350 |
| Tensile Strength | 800-1000 |
Hardening and Forging:
- Hardening: Hardened by heating at 1000-1050°C followed by water quenching, resulting in a hardness of around 200 HB.
- Forging: Hot forming can be performed at temperatures between 1050°C and 850°C.
Machinability:
X120Mn12 is challenging to machine due to its high work-hardening properties and low resistance to variable loads.
Designation by Standards:
| Brand Name | Designation |
|---|---|
| SIDUR 3401 | 12MN |
| Mat. No. | 1.3401 |
| DIN | X120Mn12 |
| AISI / SAE | A128 Grade A |
