16Mo3 steel, also known as ultra-low temperature stainless steel, is a kind of iron carbon alloy structural steel, at -196℃ still has excellent performance. The steel has high hardness, high wear resistance and good oxidation resistance. After recrystallization annealing, the steel can obtain high hardness, high wear resistance and low tempering brittleness. Its chemical composition is composed of nickel, chromium, molybdenum, nickel 38%~38%, chromium 6%~8%. The steel has good wear resistance and impact resistance when annealing at low temperature below 870℃. However, high temperature recrystallization annealing below 900℃ has a certain strength and toughness. After this heat treatment, it can effectively reduce the brittleness of the workpiece at low temperature, and the lower the quenching temperature, the better the effect.
The chemical composition of 16Mo3 steel is mainly composed of nickel, chromium and molybdenum, in which the content of nickel is 38%~38%, chromium is 6%~8% and molybdenum is 3%~4%. 16Mo3 steel can meet the requirements of toughness and wear resistance in a wide range, and its tempering stability is good.
1. Nickel is a strengthening element and has a strengthening effect on 16Mo3 steel. Because of the high nickel content in steel, the deformation during hot working is small and uniform, can avoid the phenomenon of stress concentration in the deformation processing. And nickel will form a dense metal film, so that the corrosion resistance of the steel is improved.
The higher the nickel content in 16Mo3 steel, the better, but when it is too high, a lot of oxides will be produced and austenite structure will be formed. Due to the low Ms point (-196℃) and easy to form brittle cracks at room temperature, this steel is generally not used.
2. Chromium chromium is soluble in iron in steel to stabilize the ferrite structure and improve the corrosion resistance; At the same time, because chromium can improve the strength and toughness of steel, it can improve the plasticity, weldability and cold bending.
3. Molybdenum Due to the synergistic effect of molybdenum element with nickel and chromium alloy elements, it can improve the strength and toughness of steel; It can also prevent the formation of oxidation layer on the workpiece surface and prevent corrosion on the steel surface; At the same time, reducing carbon content avoids brittleness caused by high nickel content.
16Mo3 steel is usually used to manufacture important parts that work at low temperature but require high wear resistance, corrosion resistance and impact resistance, tempering brittleness resistance and creep resistance.
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