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Standard grades
AISI 4130/4130 mod
API mechanical properties may be obtained on products beyond 5"
H2S variant offering hardness < 22 HRC
good weldability
Ca treated and degassed steel
AISI 4140
H2S variant offering hardness < 22 HRC
Ca treated and degassed steel
AISI 4145H mod
very good inclusion cleanness conforming to AMS 2301
Good machinability, particularly for drilling
AISI 4340
good compromise between strength and toughness
excellent macro cleanness conforming to AMS 2304
AISI 4330V mod
very good strength and toughness including at 2" below the surface
Excellent macro cleanness conforming to AMS 2304
EN30B
Good impact strength at low temperatures
Excellent macro cleanness conforming to AMS 2304
AISI 410/420
H2S/CO2 corrosion resistance
Excellent macro cleanness conforming to AMS 2304