JIS G4305 SUS420J2 Steel Plate | 420J2 Stainless Steel
General Description
As a professional stainless steel supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G4305 SUS420J2 Steel Plate (also known as 420J2 stainless steel).
SUS420J2 is a high-carbon 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 SUS420J1, allowing it to reach higher hardness levels after heat treatment. This makes it particularly suitable for applications requiring excellent wear resistance and edge retention, such as cutlery, surgical instruments and molds. In the annealed condition it has moderate corrosion resistance and good machinability. The grade is fully magnetic.
SHH STEEL supplies SUS420J2 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 | SUS420J2 | 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) | 0.26 – 0.40 |
| 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 SUS420J1 enables superior hardness and wear resistance after quenching and tempering.
Mechanical Properties
Mechanical properties of JIS G4305 SUS420J2 (annealed condition):
| Property | Value |
|---|---|
| Yield Strength (0.2%) | ≥ 225 MPa |
| Tensile Strength | ≥ 540 MPa |
| Elongation | ≥ 18% |
| Hardness | ≤ 248 HB |
After proper heat treatment (quenching and tempering), hardness can typically reach 50–58 HRC, providing excellent edge retention and 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, molds |
Delivery Conditions
SHH STEEL supplies JIS G4305 SUS420J2 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
- High carbon content enables very high hardness after heat treatment
- Excellent wear resistance and edge retention
- Moderate corrosion resistance in mild environments
- Good machinability in the annealed condition
- Fully magnetic
- Ideal for cutting tools, blades and precision wear parts
- Higher hardness potential than SUS420J1 and SUS410
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SUS420J2 | JIS G4305 | — |
| 420 | ASTM A240 | American equivalent |
| 1.4028 / X30Cr13 | EN 10088-2 | European equivalent |
| 3Cr13 / 30Cr13 | GB/T 1220 / GB/T 3280 | Chinese equivalents |
| UNS S42000 | — | Related Unified Numbering |
Applications
JIS G4305 SUS420J2 is widely used where high hardness, wear resistance and moderate corrosion resistance are required. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Cutlery & Kitchen Tools | High-end knives, scissors, blades – 420J2 Cutlery |
| Surgical & Dental Instruments | Surgical blades, precision tools – 420J2 Surgical |
| Molds & Dies | Plastic molds, cutting dies – 420J2 Mold |
| Valves & Pumps | Valve components, wear parts – 420J2 Valve |
| Machinery Components | Shafts, wear plates, fasteners – 420J2 Machinery |
| Industrial Equipment | Cutting tools, blades – 420J2 Industrial |
Why Choose SHH STEEL
SHH STEEL provides SUS420J2 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 SUS420J2 Steel Plate.
Customers benefit from reliable supply, short lead times and cost-effective solutions for high-hardness martensitic stainless steel projects. Our professional export team provides technical support on heat treatment, material selection and processing.
FAQ
- What is the main difference between SUS420J1 and SUS420J2?SUS420J2 has higher carbon content (0.26–0.40%) than SUS420J1 (0.16–0.25%), allowing it to achieve higher hardness and better wear resistance after heat treatment.
Conclusion
JIS G4305 SUS420J2 Steel Plate (420J2 Stainless Steel) from SHH STEEL is a high-carbon martensitic stainless steel offering excellent hardness, superior 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 SUS420J2 stainless steel requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G4305 SUS420J2 Steel Plate, SUS420J2, 420J2 stainless steel, 420J2 stainless steel plate, SUS420J2 supplier
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