JIS G4305 SUS420J1 Steel Plate | 420J1 Stainless Steel
General Description
As a professional stainless steel supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G4305 SUS420J1 Steel Plate (also known as 420J1 stainless steel).
SUS420J1 is a martensitic stainless steel under the Japanese standard JIS G4305 for cold-rolled stainless steel plates, sheets and strips. It contains 12–14% chromium and higher carbon than SUS410, allowing it to be hardened by heat treatment to achieve higher hardness and improved wear resistance. In the annealed condition it has moderate corrosion resistance and good machinability. SUS420J1 is widely used for cutlery, surgical instruments, valves and other components requiring a combination of hardness and corrosion resistance.
SHH STEEL supplies SUS420J1 as Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This ensures competitive mill pricing, consistent quality, shorter lead times and full traceability. We offer thicknesses from 0.5 mm to 6.0 mm (thicker plates available on request), widths up to 1500 mm, in coil or cut-to-length form. All materials are delivered with full Mill Test Certificates.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | JIS G4305 | Full compliance |
| Steel Grade | SUS420J1 | Confirmed |
| Product Form | Cold-rolled Plate / Sheet / Coil | Available |
| Surface Finish | 2B, BA, No.4, polished (common) | Available |
| Thickness Range | 0.5 mm – 6.0 mm | Custom sizes available |
| Width | Up to 1500 mm | Available |
| Certification | EN 10204 3.1 / Mill Certificate | Available |
Chemical Composition
Chemical composition according to JIS G4305 (Heat Analysis):
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.16 – 0.25 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 12.00 – 14.00 |
| Nickel (Ni) | ≤ 0.60 |
Note: The higher carbon content compared with SUS410 enables higher hardness after quenching and tempering.
Mechanical Properties
Mechanical properties of JIS G4305 SUS420J1 (annealed condition):
| Property | Value |
|---|---|
| Yield Strength (0.2%) | ≥ 225 MPa |
| Tensile Strength | ≥ 520 MPa |
| Elongation | ≥ 18% |
| Hardness | ≤ 235 HB |
After heat treatment (quenching and tempering), hardness can typically reach 45–55 HRC depending on the process, providing excellent wear resistance.
Density: Approximately 7.75 g/cm³ Magnetic: Yes (martensitic)
Surface Finishes
| Finish | Description | Typical Applications |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | General fabrication |
| BA | Bright Annealed | Cleaner surface applications |
| No.4 | Brushed finish | Decorative or visible parts |
| Polished | Mirror or custom polish | Cutlery, surgical instruments |
Delivery Conditions
SHH STEEL supplies JIS G4305 SUS420J1 as Mill Direct Supply mainly in annealed condition. Hardened and tempered material can be arranged according to customer requirements.
Additional options available:
- Coil or cut-to-length sheets/plates
- Protective film
- Third-party inspection (SGS, BV, TUV, etc.)
Key Characteristics
- Can be hardened to high hardness and strength by heat treatment
- Better wear resistance than SUS410
- Moderate corrosion resistance in mild environments
- Good machinability in annealed condition
- Fully magnetic
- Suitable for cutting tools, blades and wear-resistant parts
- More economical than higher-alloyed stainless steels
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SUS420J1 | JIS G4305 | — |
| 420 | ASTM A240 | American equivalent |
| 1.4021 / X20Cr13 | EN 10088-2 | European equivalent |
| 2Cr13 / 20Cr13 | GB/T 1220 / GB/T 3280 | Chinese equivalents |
| UNS S42000 | — | Unified Numbering System |
Applications
JIS G4305 SUS420J1 is widely used where higher hardness and wear resistance are required together with moderate corrosion resistance. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Cutlery & Kitchen Tools | Knives, scissors, blades – 420J1 Cutlery |
| Surgical & Dental Instruments | Surgical blades, tools – 420J1 Surgical |
| Valves & Pumps | Valve seats, pump parts – 420J1 Valve |
| Machinery Components | Shafts, wear parts, fasteners – 420J1 Machinery |
| Industrial Equipment | Cutting tools, molds – 420J1 Industrial |
| General Fabrication | Parts requiring heat treatment – 420J1 Fabrication |
Why Choose SHH STEEL
SHH STEEL provides SUS420J1 as Mill Direct Supply. We maintain long-term strategic cooperation with major Chinese stainless steel mills and act as a first-level agent. This direct mill supply model allows us to offer competitive mill-direct pricing, faster delivery times, consistent quality, and full Mill Test Certificates for JIS G4305 SUS420J1 Steel Plate.
Customers benefit from reliable supply, short lead times and cost-effective solutions for martensitic stainless steel projects requiring higher hardness. Our professional export team provides technical support on heat treatment, material selection and processing.
FAQ
- What is the main difference between SUS410 and SUS420J1?SUS420J1 has higher carbon content, allowing it to achieve significantly higher hardness and better wear resistance after heat treatment compared with SUS410.
- What is the density of SUS420J1?Approximately 7.75 g/cm³.
Conclusion
JIS G4305 SUS420J1 Steel Plate (420J1 Stainless Steel) from SHH STEEL is a martensitic stainless steel offering high hardness potential, good wear resistance and moderate corrosion resistance. As Mill Direct Supply, we provide competitive pricing, consistent quality and full technical support. Trust SHH STEEL for your SUS420J1 stainless steel requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G4305 SUS420J1 Steel Plate, SUS420J1, 420J1 stainless steel, 420J1 stainless steel plate, SUS420J1 supplier
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