40Mn18Cr4V Non-Magnetic Steel plate
40Mn18Cr3 is a high-performance non-magnetic steel widely used in large and medium-sized transformers, electromagnets, and other non-magnetic structural applications. It belongs to the Fe-Mn-Al-C austenitic series, featuring stable microstructure, excellent mechanical properties, low magnetic permeability, and high electrical resistivity.
- Description
Key Grades in the Non-Magnetic Steel Family
Common non-magnetic steel grades include:
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20Mn23AlV
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30Mn20Al3
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45Mn17Al3 (917)
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40Mn18Cr3
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40Mn18Cr4V
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50Mn18Cr4V
These alloys are engineered to meet the electromagnetic compatibility requirements in demanding environments.
Electromagnetic and Mechanical Performance
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Stable Austenitic Structure: Remains non-magnetic even after processing.
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Low Permeability: At 16,000 A/m (200 Oersteds), magnetic permeability (μ) is ≤ 1.319 × 10⁻⁶ H/m—lower than that of standard stainless steel (μ ≈ 1.339 × 10⁻⁶ H/m).
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Minimal Eddy Current Losses: Ideal for high-efficiency electromagnetic systems.
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High Strength: Achieved through solution treatment, semi-hot deformation, or cold working processes.
Applications of 40Mn18Cr3 Non-Magnetic Steel
40Mn18Cr3 is commonly used as non-magnetic retaining ring steel in Class I to Class III turbine generator retaining rings, as well as other critical non-magnetic components. It is designed to meet stringent performance requirements in high-intensity magnetic fields without losing structural integrity.
40Mn18Cr3 Non-Magnetic Steel Chemical Comosition:
| C | Si | Mn | S | P | Cr |
| 0.30~0.55 | 0.30~0.8 | 17.00~19.00 | ≤0.05 | ≤0.05 | 3.00~5.00 |
40Mn18Cr3 Non-Magnetic Steel Mechanical Properties:
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation % | Reduction of area % |
| 735 | 637 | 80 | 35 |
Packaging
bundle package; wooden case,wooden pallet package; container or bulk; special according to customer request
