What is the equivalent of SUS 420J2?
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What material is SUS420J2?
SUS420J2 is a Japanese Industrial Standard (JIS) designation for a martensitic stainless steel known for its high hardness, strength, and good wear resistance after heat treatment (quenching and tempering), making it suitable for cutting tools, surgical instruments, valves, and plastic mold components, while offering decent corrosion resistance for its type. It's an economical grade with higher carbon content (0.26-0.40%) than basic 420, enhancing its hardness but slightly reducing corrosion resistance compared to austenitic steels.
What is the equivalent of SUS 420J2?
SUS420J2 is a Japanese (JIS) martensitic stainless steel, with its closest equivalents being AISI 420 (USA), UNS S42000, and European EN X30Cr13 (1.4028), offering a balance of hardness, wear resistance, and corrosion resistance for applications like knives and surgical tools. Other equivalents include China's 3Cr13, UK's 420S45, and similar grades like 420HC.
| Standard | USA | Europe | UK | |
| Designation | UNS | AISI | EN | BS |
| SUS420J2 | Ｓ42000 | 420 | X30Cr13 | 420S45 |
Chemical Formula of SUS420J2 Stainless Steel
| Designation | C | Si | Mn | P | S | Cr |
| SUS420J2 | 0.26～0.40 | ≦1.00 | ≦1.00 | ≦0.040 | ≦0.030 | 12.00～14.00 |
Mechanical properties
| Designation | Finishing condition | Hardness | Tensile strength | Elongation |
| HV | N/mm2 | % | ||
| SUS420J2 | Annealed | 150～200 | 540～655 | 20～30 |
| Full hard | 280～320 | 880～1030 | 1～3 |
SUS 420J2 stainless steel Machinability
Stainless steel grade 420J2 is machinable both in hardened and tempered conditions such as turning, drilling, and bending; however it is recommended that machining in hardened condition should be avoided as far as possible.
SUS 420J2 stainless steel Welding
Welding of stainless steel grade 420J2 is easy. It is recommended that welding in annealed or hardened and tempered conditions should be avoided as it causes formation of brittleness, resulting in cold cracking due to contraction stresses.
Pre-heating and inter-pass temperature control during welding, followed by very slow cooling and post-weld annealing are good measures to take to prevent cracking.
SUS 420J2 stainless steel Heat Treatment
Stainless steel grade 420J2 has to be heated uniformly to 730-790°C (1346-1454°F) and held until temperature is uniform throughout the section.
Hardening
Stainless steel grade 420J2 can be hardened by heating 950-1020°C (1742-1868°F) and held until temperature is uniform throughout the section. This should be followed by quenching in oil or air cooling. Tempering should be done when it is slightly warm.
SUS 420J2 stainless steel Applications
Cutlery & Tools: Kitchen knives, diving knives, pocket knives, surgical tools, and household/grooming scissors.
Medical Devices: Instruments that need to be sterilized, such as scissors and forceps, benefiting from its corrosion resistance.
Industrial Components: Pump shafts, industrial blades, and mechanical parts needing better wear resistance and hardness.
Molds: Used in plastic molds due to its hardness and cost-effectiveness.
What is the difference between 420J2 and 420 stainless steel?
The main difference lies in the carbon content: 420J2 has a higher carbon content (0.26-0.4%) than standard 420 (low carbon), making 420J2 harder and more suitable for knives, but its corrosion resistance and toughness are slightly lower than 420J1. The general "420" is a broader category, often used for its excellent corrosion resistance in medical instruments, while 420J2 offers a good balance of hardness and toughness for cutlery.
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