Material Description
Grade 420J1 stainless steel is a high-carbon steel with a minimum chromium content of 12%. Like any other stainless steel, grade 420 can also be hardened through heat treatment. It offers good ductility in its annealed state and excellent corrosion resistance properties when the metal is polished, surface grounded or hardened. This grade has the highest hardness, 50HRC, among all the stainless-steel grades with 12% chromium.
Stainless steel grades that are similar to grade 420 stainless steels include martensitic steels such as the other versions of grade 420, having Vanadium, Sulphur and Molybdenum in their composition, and the grade 440 series. Non-standard grade 420J2 has carbon content that is little higher than that of grade 420.
Martensitic stainless steels are ones with high hardness and high carbon content. These steels are generally fabricated using methods that require hardening and tempering treatments. The operating conditions of martensitic steels are affected by loss of material’s strength at high temperatures, and decrease in ductility at negative temperatures.
Material Properties Excellent hardness and toughness Easy for heat treatment, like annealing, hardening High corrosion resistance High Formability Can be highly polished and easily machined | Applications Surgical instruments Daggers, swords and cutlery Budget knives and diving knives Shear blades Needle valves |
Composition of Powder (AMS5506, ASTM A176)
Element | Chemical Formula | Chemical Composition (%) 420J1 | Chemical Composition (%) 420J2 | CAS NO. |
Carbon | C | 0.15-0.25 | 0.3-0.4 | 7440-44-0 |
Manganese | Mn | ≤1.00 | ≤1.00 | 7439-96-5 |
Silicon | Si | ≤1.00 | ≤1.00 | 7440-21-3 |
Chromium | Cr | 12.0-14.0 | 12.0-14.0 | 7440-47-3 |
Phosphorus | P | ≤0.035 | ≤0.035 | 7723-14-0 |
Sulphur | S | ≤0.035 | ≤0.035 | 7704-34-9 |
Iron | Fe | Bal. | Bal | 7439-89-6 |
Mechanical Properties
At room temperature after Annealed | |
Tensile Strength (Remark 3) | 700-850Mpa |
Yield Strength (Remark 3) | 495-555Mpa |
Hardness HRB (Remark 4) | 201-255 |
Particle size distribution optimized to suit specific machine platforms and process types (i.e. SLM, EBM, LMD, etc.) Custom sizing also available.
Full powder qualification including (but not exclusive to) the following: Size Distribution, Flow Properties, Chemistry and Morphology.
Remarks:
1. Most metal powders of AMC has been tested on EOS M280/M290, Concept Laser SLM series 3D printers, Renishaw SLM series 3D printers, and most domestic 3D printers like Farsoon, AFS, E-plus and so on.
2. AMC can customize the chemical composition, particle size, flowability of the metal powders in additive manufacturing.
3. Tested at ambient temperature by Nadcap and UKAS accredited independent laboratory. Test ASTM E8. Machined prior to testing. SUS420 is tested according to AS2837-1986.
4. Tested to ASTM E384-11, after polishing.
Well-Proportioned PSD
High Sphericity
Low Oxygen Content
Cost Effective
