Nippon Yakin Kogyo NASH38X Heat Resistant Alloys

Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model : NASH38X

NASH38X (UNS N08120)

Heat-Resistant Nickel Alloy

NASH38X (UNS N08120) is a high-nickel heat resistant alloy offering outstanding high-temperature strength and oxidation resistance. With a coarse grain structure controlled by high-temperature heat treatment and C, N, Nb components, NASH38X offers particularly high creep strength.

Nippon Yakin supplies NASH38X in plate form.

Chemical Composition38Ni-25Cr-0.6Nb-0.2N
Product shape

Plate

WorkabilityCold workability is equivalent to standard austenitic stainless steel.
WeldabilityNAS-HX is weldable by TIG, MIG, and shielded arc welding processes. AWS A5.9 ER3856 welding electrodes are commonly used.
Heat TreatmentNAS-HX exhibits an austenite structure similar to austenitic stainless steel and is heat treated in the same way. Typical heat treatment is as follows: Solution treatment: 1177-1232°C; Rapid cooling.
PicklingA mixture of nitric and fluoric acid is used in pickling.

Grade/Standard

Nippon Yakin GradeJISASTMUNS
NASH38XASTM B409UNS N08120

Chemical Composition

CSiMnPSNiCrCoCu
Specification
ASTM B409 (UNS N08120)
≤0.02≤0.50≤0.030≤0.01558.00–63.0027.00–30.00≤0.50
Specification
ASTM B409 (UNS N08120)
Bal.

Physical Properties

Mechanical Properties

1. Mechanical Properties at Room Temperature

Density [g/cm³]8
Specific heat [J/kg•K]472
Electrical resistivity [μΩ•cm]119
Thermal conductivity [W/m•K]11.5
Average coefficient of thermal expansion
[10⁻⁶/°C]
25–200°C 14.6
25–300°C 15.0
25–600°C 16.2
25–700°C 16.6
25–900°C 17.0
Young’s modulus [MPa]19.6 × 10⁴

Mechanical Properties

1. Mechanical Properties at Room Temperature.

0.2% proof stress [MPa]Tensile strength [MPa]Elongation [%]Hardness [HBW]
Specification ASTM B409 (UNS N08120)≥276≥621≥30
ExampleHot-rolled plate 16 mm231872651176

2. Creep Properties

Test conditionRupture time [hr]Elongation [%]
ExampleHot-rolled plate 16 mm2816°C, 110MPa8665

Heat Treatment and Grain Size

Heat TreatmentCrystal Grain Size
ASTM B409 (UNS N08120)≥1177°CNo. 5 or coarser

High Temperature Strength

Nippon Yakin Kogyo NASH38X Heat Resistant Alloys

Allowable Stress

Nippon Yakin Kogyo NASH38X Heat Resistant Alloys

Cyclic Oxidation Properties

Nippon Yakin Kogyo NASH38X Heat Resistant Alloys

Workability

Cold workability is equivalent to standard austenitic stainless steel.

Weldability

NASH38X is weldable by TIG, MIG, and shielded arc welding processes. AWS A5.9 ER3556 welding electrodes are commonly used.

Heat Treatment

NASH38X exhibits an austenite structure similar to austenitic stainless steel and is heat-treated in the same way. Typical heat treatment is as follows:

  • Solution treatment: 1,177–1,232°C; Rapid cooling.

Pickling

A mixture of nitric and hydrofluoric acid is used in pickling.

Properties

NASH38X provides outstanding high-temperature strength, oxidation resistance, and carburization resistance, as well as excellent creep characteristics in temperatures of 800°C and above.

Applications

  • Furnace parts
  • Heat treatment fixtures

 

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