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 Composition19Ni-20Cr-0.4Ti-0.4Al
Product ShapeNippon Yakin Kogyo NASH840 Heat Resistant AlloysCoilNippon Yakin Kogyo NASH840 Heat Resistant AlloysSheet
WeldabilityNASH840 has superior weldability. After plasma welding, no cracking occurred in the bending test or 30% tensile test.
Heat TreatmentHeat 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.

ApplicationsSheathed heater, Furnace parts.

Steel Grade/Standard

Nippon Yakin GradeJISASTMEN
NASH840

Chemical Composition

CSiMnPSNiCrAlTi
Specification (NASH840)≤0.08≤1.00≤1.00≤0.030≤0.01518.00–22.0018.00–22.00≤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
27054045130

High Temperature Strength

Content for high temperature strength can be added here.

Nippon Yakin Kogyo NASH840 Heat Resistant Alloys

Oxidation Resistance

Nippon Yakin Kogyo NASH840 Heat Resistant Alloys
Corrosion Resistance

Stress Corrosion Cracking Resistance

Test I
20% NaCl + 1% Na2Cr2O7
(boil, 330hr)
Test II
30% MgCl2
(boil, 110hr)
NASH840No SCCNo SCC
NCF800No SCCNo SCC
SUS316SCCSCC
SUS304SCCSCC

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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