21-4N是什么材料

化学成分

• 碳（C）：0.48～0.58%

• 硅（Si）：≤0.35%

• 锰（Mn）：8.00～10.00%

• 磷（P）：≤0.04%

• 硫（S）：≤0.03%

• 铬（Cr）：20.00～22.00%

• 镍（Ni）：3.25～4.50%

• 氮（N）：0.35～0.50%123

物理和机械性能

• 无磁性：21-4N具有优异的无磁性能，这主要归因于其奥氏体结构。

• 耐腐蚀性：高铬含量使得21-4N在各种腐蚀性环境中表现出色，包括酸性和碱性环境。

• 高强度和高硬度：21-4N在高温下仍能保持良好的机械性能，适用于高应力和高温条件。

• 良好的加工性能：该钢材适合于冷加工和热加工，包括锻造、轧制和焊接等。1

热处理

应用

21-4N主要用于制造承受高温强度的内燃机排气阀等部件。由于其良好的高温性能和耐腐蚀性，它也适用于化工、石油、冶金等领域。

21-4N is an austenitic heat-resistant steel, also known as 53Cr21Mn9Ni4N or 5Cr21Mn9Ni4N. This type of steel is widely used in the manufacturing of high-temperature components such as internal combustion engine exhaust valves due to its excellent high-temperature strength, high-temperature hardness, and corrosion resistance. Here is a detailed introduction about 21-4N:

chemical composition

The chemical composition of 21-4N includes high levels of chromium (Cr), manganese (Mn), nickel (Ni), and nitrogen (N), which work together to give steel excellent heat resistance and corrosion resistance. The specific ingredients are as follows:

Carbon (C): 0.48-0.58%

Silicon (Si): ≤ 0.35%

Manganese (Mn): 8.00-10.00%

Phosphorus (P): ≤ 0.04%

Sulfur (S): ≤ 0.03%

Chromium (Cr): 20.00-22.00%

Nickel (Ni): 3.25-4.50%

Nitrogen (N): 0.35-0.50%

physical and mechanical properties

Non magnetic: 21-4N has excellent non-magnetic properties, mainly attributed to its austenitic structure.

Corrosion resistance: The high chromium content makes 21-4N perform well in various corrosive environments, including acidic and alkaline environments.

High strength and hardness: 21-4N can maintain good mechanical properties at high temperatures, suitable for high stress and high temperature conditions.

Good processing performance: This steel is suitable for both cold and hot processing, including forging, rolling, and welding.

heat   treatment

21-4N steel usually requires solution aging heat treatment to obtain suitable microstructure and properties. The solution treatment temperature is generally 1100-1200 ℃, and the aging treatment temperature is 730-780 ℃.

application

21-4N is mainly used to manufacture components such as internal combustion engine exhaust valves that can withstand high temperature strength. Due to its excellent high-temperature performance and corrosion resistance, it is also suitable for fields such as chemical, petroleum, metallurgy, etc.