Nippon Yakin Kogyo Co., Ltd
Nippon Yakin Kogyo NASNM15M Non-Magnetic Alloys
Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model : NASNM15M
NASNM15M
Non-Magnetic High-Strength Stainless Steel
Nippon Yakin developed NASNM15M, a high-manganese austenitic stainless steel, with a composition of 17Cr-15Mn-4Ni.A high-manganese austenitic stainless steel, NASNM15M was developed by Nippon Yakin with a composition of 17Cr-15Mn-4Ni. Providing higher strength than conventional non-magnetic austenitic stainless steels, NASNM15M does not magnetize even if cold worked with force. Nippon Yakin supplies this product in plate, sheet, and strip forms.
| Chemical Composition | 17Cr-15Mn-4Ni-0.3N | ||
Product shape |  Coil |  Sheet |
|
| Workability | The hot and cold workability of NASNM15M is basically the same as that of standard austenitic stainless steels such as Type 304, Type 316, etc. However, it is important to consider that this is a high-strength material in both cold and hot working processes. | ||
| Heat Treatment | The heat treatment is similar to austenitic stainless steels. The typical heat treatment is as follows: Solution heat treatment: 1050~1150°C; rapid cooling. | ||
PlateSteel Grade/Standard
| Nippon Yakin Grade | JIS | ASTM |
|---|---|---|
| NASNM15M | — | — |
Chemical Composition
| Specification (NASNM15M) | C | Si | Mn | P | S | Ni | Cr | N |
|---|---|---|---|---|---|---|---|---|
| 0.040~0.090 | ≦0.90 | 14.00~15.00 | ≦0.045 | ≦0.015 | 4.00~4.60 | 16.50~17.50 | 0.30~0.35 |
Physical Properties
| Density | [g/cm³] | 8.00 |
|---|---|---|
| Specific heat | [J/kg·K] | 480 |
| Electrical resistivity | [µΩ·cm] | 77 |
| Thermal conductivity | [W/m·K] | 13.2 |
| Average coefficient of thermal expansion | [10⁻⁶/°C] | 30~100°C: 16.0 30~300°C: 17.7 30~500°C: 19.2 30~700°C: 20.3 |
| Young’s modulus | [MPa] | 19.6 × 10⁴ |
| Magnetism | None | |
| Melting range | [°C] | 1360~1412 |
Mechanical Properties
Mechanical Properties at Room Temperature
| Specification (NASNM15M) | 0.2% proof stress [MPa] | Tensile strength [MPa] | Elongation [%] | Hardness [HV] |
|---|---|---|---|---|
| Specification (NASNM15M) | ≧390 | ≧690 | ≧30 | ≦240 |
| Cold-rolled sheet | 461 | 789 | 45 | 211 |
High Temperatures Strength
Work Hardening
Permeability
Even when cold working is applied, there is no variation in the relative permeability, and NASNM15M does not become magnetized.
Age Hardening Behavior
After cold-rolling, the hardness of NASNM15M can be raised to between 50 and 70 Hv with heat treatment between 300 and 500°C.
Corrosion Resistance
Just as with the standard austenitic stainless steel Type 304, the corrosion resistance of NASNM15M shows no degradation even after strong cold working.
Evaluation of Pitting Corrosion Resistance
| Solution-treated NASNM15M | 0.34V |
|---|---|
| 60% cold-rolled NASNM15M | 0.31V |
Test condition: 5% NaCl, 30°C
Atmospheric Corrosion Resistance in Salt Spray Test
| Solution-treated NASNM15M | No rusting |
|---|---|
| 60% cold-rolled NASNM15M | No rusting |
Test condition: 5% NaCl, 35°C for 7 days
Workability
The hot and cold workability of NASNM15M is basically the same as that of standard austenitic stainless steels such as Type 304, Type 316, etc. However, the fact that this is a high strength material must be considered in both cold and hot working.
Heat Treatment
The heat treatment is similar to austenitic stainless steels. The typical heat treatment is as follows:
Solution heat treatment: 1030–1150°C; rapid cooling
Solution heat treatment: 1030–1150°C; rapid cooling
Applications
Non-magnetic springs, Electronic components, Components in which a non-magnetic property is required.
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