Distinguish between 420 420J1 and 420J2 stainless steel performance characteristics:
The main difference between stainless steel 420J1 and 420J2
420J1 has a certain degree of wear resistance and corrosion resistance, high hardness, and its price is the lower of the stainless steel balls. It is suitable for the working environment that requires ordinary stainless steel.
420J2 stainless steel belt is a brand of stainless steel produced in accordance with American ASTM standards; Japanese standard SUS420J2, new national standard 30Cr13, old national standard 3Cr13, digital code S42030, European standard 1.4028.
420J1 stainless steel: After quenching, the hardness is high, and the corrosion resistance is good (magnetic). After quenching, 420J2 stainless steel is harder than 420J1 steel (magnetic).
Generally, the quenching temperature of 420J1 is 980~1050℃. The hardness of 980℃ heating oil quenching is significantly lower than 1050℃ heating oil quenching. The hardness after 980℃ oil quenching is HRC45-50, and the hardness after 1050℃ oil quenching is 2HRC higher. However, the microstructure obtained after quenching at 1050℃ is coarse and brittle. It is recommended to use 1000℃ heating and quenching to get better structure and hardness.
Stainless Steel 420 / 420J1 / 420J2 Sheets & Plates Equivalent Grades:
| STANDARD | JIS | WERKSTOFF NR. | BS | AFNOR | SIS | UNS | AISI |
| SS 420 |
SUS 420 | 1.4021 | 420S29 | - | 2303 | S42000 | 420 |
| SS 420J1 | SUS 420J1 | 1.4021 | 420S29 | Z20C13 | 2303 | S42010 | 420L |
| SS 420J2 | SUS 420J2 | 1.4028 | 420S37 | Z20C13 | 2304 | S42010 | 420M |
SS 420 / 420J1 / 420J2 Sheets, Plates Chemical Composition (saky steel):
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo |
| SUS 420 |
0.15 max | 1.0 max | 1.0 max | 0.040 max | 0.030 max | 12.0-14.0 | - | - |
| SUS 420J1 | 0.16-0.25 | 1.0 max | 1.0 max | 0.040 max | 0.030 max | 12.0-14.0 | - | - |
| SUS 420J2 | 0.26-0.40 | 1.0 max | 1.0 max | 0.040 max | 0.030 max | 12.0-14.0 | - | - |
SS 420 420J1 420J2 Sheets, Plates Mechanical properties(saky steel):
| Grade | Tensile Strength Max | Yield Strength (0.2%Offset) Max | Elongation(in 2 in.) |
| 420 | MPa – 650 | MPa – 450 | 10 % |
| 420J1 | MPa – 640 | MPa – 440 | 20% |
| 420J2 | MPa – 740 | MPa – 540 | 12% |
The hardness of 420 series steel after heat treatment is roughly HRC52~55, and the performance of various aspects such as damage resistance is not very outstanding. Because it is easier to cut and polish, it is suitable for the production of knives. 420 stainless steel is also called “cutting grade” martensitic steel. 420 series steel has excellent rust resistance due to its low carbon content (carbon content: 0.16~0.25), so it is an ideal steel for the production of diving tools.
Post time: Jul-07-2020