Nippon Yakin Kogyo Co., Ltd
Nippon Yakin Kogyo NASH840 Heat Resistant Alloys
Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model : NASH840
NASH840
Heat Resistant Stainless Steel
NASH840 is an austenitic stainless steel with excellent oxidation resistance and high temperature corrosion resistance against chlorides. It is suitable for use in high-grade sheathed heater clad tubes. Nippon Yakin supplies NASH840 in sheet and strip forms.
| Chemical Composition | 19Ni-20Cr-0.4Ti-0.4Al | |
| Product Shape |  Coil |
 Sheet |
| Weldability | NASH840 has superior weldability. After plasma welding, no cracking occurred in the bending test or 30% tensile test. | |
| Heat Treatment | Heat treatment of NASH840 can be performed in the same manner as with other austenitic stainless steels. The heat treatment temperature range is normally used as follows:
– Solution treatment: 1030–1100°C; water cooling. |
|
| Applications | Sheathed heater, Furnace parts. | |
Steel Grade/Standard
| Nippon Yakin Grade | JIS | ASTM | EN |
|---|---|---|---|
| NASH840 | — | — | — |
Chemical Composition
| C | Si | Mn | P | S | Ni | Cr | Al | Ti | |
|---|---|---|---|---|---|---|---|---|---|
| Specification (NASH840) | ≤0.08 | ≤1.00 | ≤1.00 | ≤0.030 | ≤0.015 | 18.00–22.00 | 18.00–22.00 | ≤0.6 | ≤0.6 |
Physical Properties
| Density [g/cm³] | 7.98 |
| Specific heat [J/kg•K] | 450 |
| Electrical resistivity [μΩ•cm] | 90 |
| Thermal conductivity [W/m•K] | 13 |
| Average coefficient of thermal expansion [10⁻⁶/°C] | 20–300°C 16.7 |
| 20–500°C 17.4 | |
| 20–800°C 18.6 | |
| 20–1000°C 19.4 | |
| Young’s modulus [MPa] | 19.7 × 10⁴ |
| Magnetism [μ] | None |
| Melting range [°C] | 1365–1417 |
Mechanical Properties
Mechanical Properties at Room Temperature
| 0.2% proof stress [MPa] | Tensile strength [MPa] | Elongation [%] | Hardness [HV] | |
|---|---|---|---|---|
| Specification (NASH840) | ≥205 | ≥520 | ≥30 | ≤170 |
| Example Cold-rolled sheet 0.4mm |
270 | 540 | 45 | 130 |
High Temperature Strength
Content for high temperature strength can be added here.
Oxidation Resistance
Corrosion Resistance
Stress Corrosion Cracking Resistance
| Test I 20% NaCl + 1% Na2Cr2O7 (boil, 330hr) |
Test II 30% MgCl2 (boil, 110hr) |
|
|---|---|---|
| NASH840 | No SCC | No SCC |
| NCF800 | No SCC | No SCC |
| SUS316 | SCC | SCC |
| SUS304 | SCC | SCC |
Weldability
NASH840 has superior weldability. After plasma welding, no cracking occurred in the bending test or 30% tensile test
 |
 |
|
Bending Test Specimens of NASH840 Plasma Welded Pipe 1. Face bending 2. Root bending 3. Tube expansion |
|
30% Tensile Test of NASH840 Plasma Welded Pipe
Heat Treatment
Heat treatment of NASH840 can be performed in the same manner as with other austenitic stainless steels. The heat treatment temperature range which is normally used is as follows:
-Solution treatment: 1030-1100°C; water cooling.
Applications
- Sheathed heater
- Furnace parts.
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