Heat Resistant Alloys

NAS H840

  • JIS
  • UNS
  • DIN/EN

NAS H840 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 NAS H840 in sheet and strip forms.

Products & Materials

NAS H840ProductsPDF(694KB)

Chemical Composition 19Ni-20Cr-0.4Ti-0.4Al
Product shape
Weldability NAS H840 has superior weldability. After plasma welding, no cracking occurred in the bending test or 30% tensile test.
Heat Treatment Heat treatment of NAS H840 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℃; water cooling
Applications Sheathed heater clad tubes, various types of heat resistant parts