Direct Shipment Din 42crmo4 Alloy Tool Steel Gas Content - China

For DIN 42CrMo4, after hot rolling or hot forging, it is usually delivered without heat treatment.

However, sometimes considering the machinability of the material, 42CrMo4 steel is usually selected for softening annealing.

DIN 42CrMo4 normalizing is often selected to improve processing performance, eliminate internal stress, and prepare a good metallographic structure for the final heat treatment.

What is the gas content of DIN 42CrMo4 steel? Gas in steel is a general term for oxygen, nitrogen, hydrogen and other gases in the medium absorbed by steel during smelting, welding or chemical and electrochemical reactions on the surface of steel.

Gas in steel has an adverse effect on the performance of steel, and its content should be strictly controlled Oxygen in steel

Steelmaking itself is an oxidation process.

Although deoxidizers such as ferromanganese, ferrosilicon, and aluminum are added in the later stage of steelmaking, some oxygen is still dissolved in the steel.

Oxygen generally dissolves in ferrite, or forms oxides such as FeO, SiO2, MnO, Al2O3 (i.e. non-metallic inclusions in steel), which reduces the tensile strength, plasticity and toughness of 42CrMo4 steel.

In particular, when inclusions exist, the fatigue strength of 42CrMo4 steel decreases and the hot and cold workability deteriorates.

Therefore, oxygen control technologies such as VD deoxidation must be strictly adopted to keep the oxygen content of 42CrMo4 steel below 20ppm, or even lower.

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