NM400
Wear Resistant Steel Plate
Steel Description
NM400 is a wear resistant steel with good comprehensive properties like high strength, high hardness, good wear resistance and weld ability etc.
Chemical Composition (ladle analysis)
| Thickness mm | C max % | Si max % | Mn max % | P max % | S max % | Cr max % | Ni max % | Mo max % | B max % | CEV typv. | CET typv. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 – 20 | 0.18 | 0.70 | 1.60 | 0.025 | 0.010 | 0.80 | 0.30 | 0.80 | 0.0040 | 0.44 | 0.32 |
| 20 – 40 | 0.20 | 0.70 | 1.60 | 0.025 | 0.010 | 1.00 | 0.60 | 1.00 | 0.0040 | 0.52 | 0.37 |
| 40 – 60 | 0.22 | 0.70 | 1.60 | 0.025 | 0.010 | 1.20 | 0.90 | 1.20 | 0.0040 | 0.61 | 0.43 |
| 60 – 110 | 0.22 | 0.70 | 1.60 | 0.025 | 0.010 | 1.20 | 1.20 | 1.20 | 0.0040 | 0.65 | 0.46 |
Mechanical Properties
| Hardness (HBW) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A50 % |
|---|---|---|---|
| 370 – 430 | 1000 | 1250 | 12 (transverse) |
Brinell hardness on a milled surface 1 – 2.5 mm below surface, average of three test points. At least one test specimen per batch and 35 tons, on the same grade. Tensile testing is performed between 4 – 60 mm.
Impact Properties
| Test temperature (°C) | Impact energy (J) |
|---|---|
| -20 | 30 |
Average of three tests. Single value minimum 70% of specified average. Impact testing is performed between 6 – 60 mm.
Delivery Condition
Q (Quenched) or Q.T. (Quenched and Tempered)
Tolerance
- Thickness tolerance: EN 10029 Class B (narrow on request)
- Shape, length, width tolerance: EN 10029
- Flatness tolerance: EN 10029 Class-N type-H
Surface Properties
According to EN10163-2:2004 Class A Subclass 1
Ultrasonic Testing
According to EN10160:2004 Class S1E1
Recommendations
The properties of the delivery condition can be retained after exposure to service or preheating at temperatures in excess of 250°C.