What is Stainless Steel 420?

2025-01-02

Stainless Steel 420 is a martensitic stainless steel that offers good wear resistance, equivalent to 410 + increased strength and hardness.

1. What is Stainless Steel 420?

420 belongs to the martensitic stainless steel series with 12-18% crom and a high C value. Basically, 420 is similar in structure to 410, but it has more carbon to enhance the hardness and toughness of the material. 420 steel is a kind of high hardness stainless steel.
420j2 can also be machined for different properties such as hardness, gloss and heat resistance. However, 420 is not suitable for use in high temperature or humid environments, as it is easily corroded.
420 Good wear resistance, high hardness, good wear resistance. It is commonly used in high wear resistance applications such as surgical instruments, dental instruments, knives, etc., where corrosion resistance is also important.

2.420 How about stainless steel?

420 has the advantages of good wear resistance and wear resistance, high hardness and heat treatment hardness.
However, 420 also has some limitations, such as stainless steel that is not highly corrosion resistant in high temperature or humid environments and is not environmentally friendly, may be difficult to process and easy to oxidize.
Compared to other stainless steels, the 420b is relatively inexpensive and easy to find on the market. Stainless Steel 420 steel has good wear and abrasion resistance and is suitable for medical, household, cutter and agricultural applications.

3. Abrasion resistance of stainless steel 420

Inox 420 has relatively good corrosion resistance, especially in the absence of sulfuric acid and chlorine. However, it is not the best corrosion resistant stainless steel and can be corroded in an environment containing chloric acid or acid.
In order to improve the wear resistance of 420b, the surface can be treated by heat treatment, polishing or coating. In addition, the use of 420 steel in a moderate pH environment also helps to improve its wear resistance.

4. Stainless steel 420 heat resistance

420 is a stainless steel that contains 13% chromium and has good corrosion and rust resistance. However, 420 is not as heat-resistant as some other stainless steels, such as 304 or 316.
The maximum temperature that 420 steel can withstand depends on factors such as the thickness and structure of the material, the time of contact with heat, and the temperature environment. However, as a general rule, 420j2 can withstand high temperatures of around 650 degrees Celsius very well.

5. Stainless steel 420 processing capacity

420 is a solid material that is very hard and difficult to process, especially when it is processed with simple tools or traditional processing methods. However, if 420j2 is placed under culture conditions, it will be easier to process.
The main processing methods of 420 steel include cutting 420 stainless steel with a cutter or plasma cutter, grinding, welding or argon welding, and forming by precision machining technology such as CNC machining or laser machining.

6. Stainless steel welding technology 420

420 is a very difficult material to weld because it is very hard. However, with some proper welding techniques, the 420 can still be welded. Commonly used welding techniques are :TIG welding, MIG welding, electrode welding.
TIG welding is the most commonly used welding method for 420. It uses tungsten electrodes and a gas that protects argon to be welded together with the original metal to reduce the possibility of chromium and carbon oxidation. MIG is a welding method that uses a welding wire and a shielding gas. On the other hand, the electrode welding method is also less popular because it can cause cracks and other problems.

7. Stainless steel 420 heat treatment process

Heat treatment technology is used to change the mechanical and structural characteristics of the 420 while improving processing capacity and durability. The heat treatment technology of 420 steel is heated at high temperatures and then slowly cooled in air or coolant.
The 420 is heated at a temperature from 8400 to 900°C, then at 600°C the furnace is cooled slowly and then cooled with air. Or harden your 420j2 heating in the heating temperature range of 980-1035°C, followed by the oil cooling process.
Stainless steel 420 can also be treated chemically. It is cherished that the cooling process is operated in a temperature range of 150-370°C. Forging at this temperature can increase hardness and improve mechanical properties.

8 Stainless steel 420 and 304 comparison

In components, 420 contains more carbon and less nickel than 304. The chemical composition of 420j2 is 0.15% carbon, 1% manganese, 1% silicon, 0.03% sulfur, and 0.03% phosphorus. The chemical composition of 304 is 0.08% carbon, 2% manganese, 1% silicon, 0.03% sulfur and 0.08% phosphorus.
420 is a harder steel than 304 because it contains more carbon. But it is less durable than 304 because it contains less nickel and more carbon. Therefore, 420 is suitable for applications that require high hardness, such as knives, scissors, saws, and knives, while 304 is commonly used for high-durability applications such as food and medical treatment.
The corrosion resistance of stainless steel 420 steel is not as high as that of stainless steel 304 steel, because it contains small amounts of crom and niken in its composition. But inox 420 and 304 can still resist corrosion in light acid and salt environments. The inox aisi 420 is also cheaper than the inox 304.