R250

Product Description

This specification covers a premium aircraft-quality, double vacuum-melted low-alloy steel in the form of bars, forgings and forging stock.

It is used typically for parts such as bearings operating under heavy loads and high speeds at moderate temperatures up to 600° F. E.g. bearings and rolling elements, bearing balls and races.

Melting Route

VIM + VAR

Technical Specifications

Material Numbers


M50 1.3551


Standards


6491

Chemical Composition

0.80 to 0.85 max. 0.25 0.15 to 0.35 max. 0.015 max. 0.008 4.00 to 4.25 4.00 to 4.50 max. 0.15 0.90 to 1.10 max. 0.25 max. 0.10 max. 0.25

Chemical composition (average %)

Available product shapes

  • Long Products
  • Semi-Finished Products / Billet

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