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 Composition	25Ni-23.5Cr-1.2Mo-0.3Al-0.3Ti
Product Shape	Coil	Sheet
Weldability	NAS H880 welded tube has good formability. There is no crack on the bead after several forming tests.
Blackening Property	Emissivity of NAS H880 after blackening heat treatment is the same level as alloy 800 (Low C%).
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: 1000~1100℃; water cooling
Applications	Sheathed heater, Furnace parts

Steel Grade/Standard

Nippon Yakin Grade	JIS	ASTM	EN
NASH880	—	—	—

Chemical Composition

Specification	C	Si	Mn	P	S	Ni	Cr	Mo	Cu	Al	Ti	Co	N
NASH880	≤0.030	0.30 – 0.50	0.35 – 0.65	≤0.025	≤0.002	24.50 – 27.00	22.80 – 23.90	1.15 – 1.35	≤0.25	0.20 – 0.40	0.25 – 0.45	0.05 – 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
Magnetism	None
Melting range [°C]	1,380 – 1,407

Mechanical Properties

Mechanical Properties at Room Temperature

Specification	0.2% proof stress [MPa]	Tensile strength [MPa]	Elongation [%]
Specification (NASH880)	≥205	≥520	≥30
Example: Cold-rolled sheet 0.5mm	280	587	42

High Temperature Strength

Corrosion Resistance

1. Crevice Corrosion Resistance

NaCl	5%		10%
	alloy825	NASH880	alloy825	NASH880
alloy825	○	○	○	×
alloy 800 (Low C%)	○	×	○	×

○: No corrosion      ×: Corrosion

2. Stress Corrosion Cracking Resistance

Temperature	180°C		200°C		220°C
	alloy825	NASH880	alloy825	NASH880	alloy825	NASH880
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 test	180° 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	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