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4140 mod 30-36HRc grade steel is a chromium-molybdenum steel used widely for drilling and completion parts in downhole applications.
It is a higher carbon version of 4130 resulting in greater strength and ruling sections. This grade can easily achieve yield strengths of 110KSI, however it should not be used in sour service environments above 22HRc (approx 80KSI Yield Strength).
4140 has poor weldability due to the risk of weld cracking, however machinability is fair and forgeability is very good.
Rolled or Forged
Black Bar or Bright Bar