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635M15 grade steel is a low alloy case hardening steel that may be used as an alternative to 655M17.
The steel can be carburised and hardened to produce a hard wear resistant case with a core strength of 770N/mm.
635M15 steel is still often referred to as EN351 steel - its equivalent grade under the previous BS 970: 1955 standard.
Rolled or Forged
Black Bar or Bright Bar