... We can offer OEM Service for Gear Steel Castings, and those steel castings can be produced in the following conditions:Heat treatment: ... Destructive Testing: Magnetic Particle Testing, Ultrasonic Testing, Penetrant TestingMaterial: Carbon Steel, Alloy Steel, meet ASTM, BS, DIN, NF, JIS, ISO standardIndividual ... Helical Gear, Cylindrical Gear etc. Welcome your custom drawing. cast steel gears