No. 1 JR® (Type 1)

No. 1 JR® is an oxidation-resistant steel which offers excellent electrical resistance as well as resistance to scale with a low temperature coefficient of resistance. Three types of No. 1 JR alloys are available with varying aluminum contents that provide different resistivities for greater adaptability to resistor design. Type 1 has nominal aluminum content of 4.0% and is stabilized with titanium to tie up carbon for protection against intergranular corrosion after heat treatment or welding. No. 1 JR has also been used as a magnetic core material in applications where resistance to oxidation and corrosion are required.

Type Analysis

  • Carbon (Maximum) 0.15
  • Titanium (Nominal) 0.7
  • Chromium (Nominal) 12.00-14.00
  • Iron (Nominal) Balance
  • Aluminum (Nominal) 4

Applicable Specifications

  • ASTM-A341







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