Brand: NS332
C(%): ≤0.03
Cr(%): 17.0~19.0
Ni(%): Margin
Mo(%): 16.0~18.0
Fe(%): ≤1.0
Si(%): ≤0.70
Mn(%): ≤1.00
P(%): ≤0.030
S(%): ≤0.030
A short review of the chemical composition of NS332:
1. Nickel is one of the main components, which can improve the strength and toughness of steel and improve hardenability. When the content is high, it can completely change some physical properties of steel and alloys and improve the corrosion resistance of steel.
2. Chromium is also one of the main components, which can improve the hardenability and durability of steel, and can improve the corrosion resistance and oxidation resistance of steel.
3. As one of the auxiliary alloys, copper has a prominent role in improving the atmospheric corrosion resistance of ordinary low-alloy steels, especially when used in conjunction with phosphorus. The Monel system is essentially a nickel-copper alloy.
4. As one of the auxiliary alloys, molybdenum can significantly improve the hardenability and thermal strength of steel, prevent temper brittleness, and improve remanence and coercive force. Hastelloy is essentially a nickel-molybdenum alloy.
NS332 heat treatment method and characteristics:
1. Solid solution strengthening is an important form of metal strengthening. The formation of solid solution increases the strength and hardness of metal. When the solute content is appropriate, the strength and hardness of the material can be greatly improved, while the plasticity and toughness are not significantly reduced, which is its characteristic.
2. Aging enhancement is divided into artificial aging and natural aging. Natural aging strengthening is to strengthen the alloy during placement at room temperature; while artificial aging strengthening is to strengthen the alloy during low temperature heating. Both are based on the premise of solid solution strengthening, and both are aimed at improving the strength of the alloy.
3. Precipitation strengthening is based on aging strengthening, and the purpose is to strengthen the alloy. The addition of cobalt, tungsten, molybdenum and other elements makes the alloy obtain high yield strength.
4. Grain boundary strengthening occurs because the grain boundary of the alloy is a weak link at high temperature. Adding trace amounts of boron, zirconium and rare earth elements can improve the grain boundary strength.
5. Annealing: The annealed state is the basic state of the furnace. The essence is to transform high-speed steel from austenite to pearlite. The function is to reduce the surface hardness of high-speed steel and improve the plasticity to facilitate cold deformation processing such as cutting; make the composition of the steel uniform, improve the performance, and prepare for further heat treatment; eliminate stress to prevent deformation or cracking.
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