Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model : NAS800H・NAS800T

Chemical Composition	[NAS800H]32Ni-20Cr-0.7Ti-0.2Al; [NAS800T]32Ni-20Cr-0.5Ti-0.5Al
Product shape	Coil	Sheet	Plate
Workability	Whether for hot working or cold working, NAS800H/800T offer workability similar to austenitic stainless steels.Operators should maintain temperatures between 1200 and 1230°C for hot working, although they can perform light work at temperatures as low as 850°C. To prevent cracks, we recommend avoiding the temperature range between 650 and 800°C. Although cold workability is similar to austenitic stainless steels, work hardening tends to be slightly lower.
Weldability	You can weld NAS800H/800T using techniques such as TIG, MIG, and shielded metal arc welding, just as with standard austenitic stainless steels. Welders often use AWS ERNiCr-3/AWS ENiCrFe-2 welding rods.
Heat Treatment	NAS800H/800T exhibit an austenitic structure similar to austenitic stainless steels, and appropriate heat treatment procedures and requirements are similar. Typical heat treatments are as follows: Solution treatment: 1100-1170°C; rapid cooling. For applications requiring creep rupture strength in high temperature environments, the following ASTM B409 heat treatment may be used: Solution treatment: 1121°C minimum (UNS N08810) 1149°C minimum (UNS N08811)
Properties at High Temperatures	Because of its high nickel and chromium content, NAS800H/800T resist oxidation and carburization at high temperatures. NAS800H/800T are superior to Type 310S and approach NAS800 in resistance to oxidation. Engineers widely use NAS800H/800T in applications requiring heat resistance due to their superior high-temperature strength, which is nearly equal to that of NAS800. These materials do not become brittle from sigma phase precipitation during use. While users generally apply NAS800 at temperatures below 600°C, they recommend NAS800H/800T for applicati requiring superior creep properties at higher temperatures
Corrosion resistance	NAS800H/800T offer superior corrosion resistance in oxidizing corrosive environments such as nitric acid or nitric acid sulfuric acid. Likewise, they perform well in sodium salt and other molten salt environments, with stress corrosion cracking resistance surpassing standard austenitic stainless steels.

Grade/Standards

Nippon Yakin Grade	JIS G 4902	ASTM B409	EN 10095
NAS800H	NCF800H	UNS N08810	—
NAS800T	—	UNS N08811	—

Chemical Composition

	C	Si	Mn	P	S	Ni	Cr	Cu	Al	Ti	Fe
Specification (NCF800H)	0.05–0.10	≤1.00	≤1.50	≤0.030	≤0.015	30.00–35.00	19.00–23.00	≤0.75	0.15–0.60	—	Bal.
Specification (UNS N08810)	0.05–0.10	≤1.0	≤1.5	—	≤0.015	30.00–35.00	19.00–23.00	≤0.75	0.15–0.60	—	≥39.5
Specification (UNS N08811)	0.06–0.10	≤1.5	—	≤0.015	—	30.00–35.00	19.00–23.00	≤0.75	0.15–0.60	—	≥39.5
Specification (EN 1.4876)	≤0.12	≤1.00	≤2.00	≤0.030	≤0.015	30.00–34.00	19.00–23.00	—	0.15–0.60	0.15–0.60	—

Physical Properties

Density [g/cm³]	8.03
Specific heat [J/kg•K]	460
Electrical resistivity [μΩ•cm]	99.0
Thermal conductivity [W/m•K]	12.6
Average coefficient of thermal expansion [10⁻⁶/°C]	25–200°C 15.9
	25–400°C 16.8
	25–600°C 17.3
	25–800°C 18.1
Young’s modulus [MPa]	19.7 × 10⁴
Curie point [°C]	−115
Magnetism [μ]	None
Melting range [°C]	1357–1385

Properties at High Temperatures

High-Temperature Strength

Creep Properties

Heat treatment	Temperature [°C]	Creep rupture strength [MPa]	Creep strength [MPa]
Solution treatment 1150°C	650	228	110
	704	162	54
	816	64	22
100hr	700	—	—
	1000hr	—	—
	10000hr	—	—

Workability

Whether for hot working or cold working, NAS800H/800T offer workability similar to austenitic stainless steels. For hot working, temperatures should be between 1000 and 1230°C, although light work may be done at temperatures as low as 850°C. To prevent cracks, we recommend avoiding the temperature range between 850 and 800°C. Although cold workability is similar to austenitic stainless steels, work hardening tends to be slightly lower.

Weldability

As with standard austenitic stainless steels, NAS800H/800T may be welded using techniques such as TIG, MIG, and shield metal arc welding. AWS ERNiCr-3/AWS ENiCrFe-2 welding rods are often used.

Heat Treatment

NAS800H/800T exhibit an austenite structure similar to austenitic stainless steels, and appropriate heat treatment procedures and requirements are similar. Typical heat treatments are as follows:

• Solution treatment: 1100-1170°C; rapid cooling.

For applications requiring creep rupture strength in high-temperature environments, the following ASTM B409 heat treatment may be used:

• Solution minimum: 1121°C minimum (UNS N08810)
• 1149°C minimum (UNS N08811)

Properties at High Temperatures

Because of its high nickel and chromium content, NAS800H/800T resist oxidation and carburization at high temperatures. NAS800H/800T are superior to Type 310S and approach NAS600 in resistance to oxidation. Offering superior high-temperature strength nearly equal to NAS600, NAS800H/800T are widely used in applications requiring heat resistance, as they do not become brittle due to sigma phase precipitation during use. While NAS800H is generally used at temperatures below 600°C, NAS800H/800T are recommended for applications requiring superior creep properties at higher temperatures.

Corrosion Resistance

NAS800H/800T offer superior corrosion resistance in oxidizing corrosive environments such as nitric acid or nitric acid-sulfuric acid. Likewise, they perform well in sodium salt and other molten salt environments, with stress corrosion cracking resistance surpassing standard austenitic stainless steels.

Applications

• Polyethylene production equipment
• Furnace parts
• Heat treatment fixtures
• Heat exchangers