Nippon Yakin Kogyo NASH880 Corrosion Resistant Alloys

Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model: NASH880

NASH880
Heat Resistant Stainless Steel
NASH880 is an austenitic stainless steel which was developed by Nippon Yakin. It is suitable for use in high-grade sheathed heater tubes and provides excellent corrosion resistance in wet environments such as hot water supply devices. Nippon Yakin supplies NASH880 in sheet and strip forms.

Chemical Composition25Ni-23.5Cr-1.2Mo-0.3Al-0.3Ti
Product ShapeCoilSheet
WeldabilityNAS H880 welded tube has good formability. There is no crack on the bead after several forming tests.
Blackening PropertyEmissivity of NAS H880 after blackening heat treatment is the same level as alloy 800 (Low C%).
Heat TreatmentHeat treatment of NASH880 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: 1000~1100℃; water cooling
ApplicationsSheathed heater, Furnace parts

Steel Grade/Standard

Nippon Yakin GradeJISASTMEN
NASH880

Chemical Composition

SpecificationCSiMnPSNiCrMoCuAlTiCoN
NASH880≤0.0300.30 – 0.500.35 – 0.65≤0.025≤0.00224.50 – 27.0022.80 – 23.901.15 – 1.35≤0.250.20 – 0.400.25 – 0.450.05 – 1.00≤0.02

Physical Properties

Density [g/cm³]7.92
Specific heat [J/kg·K]462
Electrical resistivity [µΩ·cm]92.5
Thermal conductivity [W/m·K]12.3
Average coefficient of thermal expansion [10⁻⁶/°C]25 – 200°C: 15.6
25 – 400°C: 16.4
25 – 600°C: 16.8
25 – 800°C: 17.6
25 – 1,000°C: 18.4
Young’s modulus [MPa]19.4 × 10⁴
MagnetismNone
Melting range [°C]1,380 – 1,407

Mechanical Properties

Mechanical Properties at Room Temperature

Specification0.2% proof stress [MPa]Tensile strength [MPa]Elongation [%]
Specification (NASH880)≥205≥520≥30
Example: Cold-rolled sheet 0.5mm28058742

High Temperature Strength

Corrosion Resistance

1. Crevice Corrosion Resistance

Test condition
① Multicrevice test piece
② Test temperature: 80°C
③ Test time: 24 hr

NaCl5%10%
alloy825NASH880alloy825NASH880
alloy825×
alloy 800 (Low C%)××

○: No corrosion      ×: Corrosion

2. Stress Corrosion Cracking Resistance

Test condition
① U-bend test piece
② Liquid solution: 10% NaCl
③ Test time: 74 hr

Temperature180°C200°C220°C
alloy825NASH880alloy825NASH880alloy825NASH880
alloy825××
alloy 800 (Low C%)

○: No SCC      ×: SCC

Weldability

NASH880 welded tube has good formability.
There is no crack on the head after several forming tests.

Flaring test

Flattening test180° Bending test (R=14mm)

Formability of NASH880 welded tubes (8mmφ × 0.5mmt)

Blackening Property

Emissivity of NASH880 after blackening heat treatment is the same level as alloy 800 (Low C%).

NASH880

NASH880

Alloy 800 (Low C%)

Appearance after blackening test

Heat Treatment

Heat treatment of NASH880 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: 1,000–1,100°C; water cooling

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