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ASTM A240 420 Stainless Steel Plate UNS S42000 with High Hardness and Wear Resistance
| MOQ: | 5Ton |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A240 420 stainless steel plate for global distributors, fabricators, equipment manufacturers, and EPC contractors requiring high hardness and wear resistance. Produced to ASTM A240/A240M as UNS S42000 (also equivalent to EN 1.4021, DIN X20Cr13, and SUS 420J1), this martensitic stainless steel is a higher-carbon variant of grade 410, designed to achieve superior hardness and mechanical properties through heat treatment.
Type 420 is distinguished by its martensitic microstructure with 12.0-14.0% chromium and carbon content up to 0.15%. This composition, higher in carbon than grade 410, enables the alloy to be hardened up to Rockwell 50 HRC—the highest hardness among the 12% chromium grades. The alloy is magnetic in all conditions and is typically used in the hardened and tempered condition for applications requiring wear resistance and moderate corrosion resistance. Corrosion resistance of grade 420 is best achieved when the metal is hardened and polished.
| Dimension | Specification |
|---|---|
| Product Name | ASTM A240 420 Stainless Steel Plate |
| Product Alias | UNS S42000 Plate / EN 1.4021 Plate / SUS 420J1 Sheet / X20Cr13 / Martensitic Stainless Plate |
| Material Type | Martensitic Stainless Steel (Hardenable, Magnetic) |
| Key Feature | Highest hardness (50 HRC) among 12% Cr grades; heat treatable for superior wear resistance and mechanical properties |
| Chemical Composition | Cr 12.0-14.0% / C ≤0.15% / Mn ≤1.00% / Si ≤1.00% / P ≤0.040% / S ≤0.030% / Fe Balance |
| Mechanical Properties | Annealed: Tensile ≥515 MPa / Yield ≥205 MPa / Elongation ≥25% / Hardness ≤241 HB ; Hardened: Up to 1900 MPa tensile, 50 HRC |
| Physical Properties | Density 7.80 g/cm3 / Melting Point 1400-1460°C / Elastic Modulus ~200 GPa / Magnetic |
| Manufacturing Process | Hot Rolling / Cold Rolling / Annealing 840-900°C / Hardening 980-1035°C / Tempering |
| Surface Finish | 2B / BA / No.1 / No.4 / HL / 8K |
| Primary Applications | Cutlery / Surgical Instruments / Valve Parts / Pump Shafts / Shear Blades / Food Processing Equipment |
| Parameter | Available Options |
|---|---|
| Product Standard | ASTM A240/A240M, ASTM A480, ASME SA-240 |
| Grade Equivalents | UNS S42000 / EN 1.4021 / JIS SUS 420J1 / DIN X20Cr13 |
| Thickness | Cold Rolled: 0.3-6.0mm; Hot Rolled: 3.0-100.0mm+ (heavier on request) |
| Width | 1000mm, 1219mm (4ft), 1500mm, 2000mm, or customized |
| Length | 2000mm-6000mm (standard 4×8ft: 1219×2438mm) or customized |
| Surface Finish | 2B / BA / No.1 / No.4 / HL / 8K |
| Edge Condition | Mill Edge / Slit Edge / Sheared Edge |
| Heat Treatment | Annealing 840-900°C / Hardening 980-1035°C (air/oil quench) / Tempering 150-370°C (avoid 425-600°C range) |
| Inspection | PMI / Tensile Test / Hardness Test / Intergranular Corrosion Test |
| Documents | MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
ASTM A240 420 stainless steel plate is specified for applications requiring high hardness, wear resistance, and moderate corrosion resistance.
Typical applications include:
- Cutlery: carving knives, table knives, kitchen utensils
- Surgical equipment and instruments
- Shear blades, needle valves, and pump shafts
- Food processing equipment (with polished surface finish)
- Valve parts, fasteners, and pump bushings
- Steam and gas turbine components
- Scissors, springs, and hose clamps
Key selection considerations: The higher carbon content gives 420 superior hardness and wear resistance compared to 410, but corrosion resistance is lower than austenitic grades like 304/316 and lower than grade 430. Best corrosion resistance is achieved when the metal is in the hardened and polished condition. 420 offers good resistance to fresh water, mild acids, food acids, and alkalis, but is not suitable for marine or high chloride environments. The alloy is magnetic in all conditions and is generally not recommended for welding, though it is possible with proper preheating and post-weld heat treatment.
Shangyou Stainless Steel provides value-added processing including cut-to-length, slitting, polishing, laser cutting, bending and forming, and protective film application.
All plates are packed with export-standard protection including protective paper between sheets, edge protection, steel strapping, waterproof wrapping, and wooden pallets or steel frames.
Quality documents include MTC 3.1, inspection reports, packing list, and heat number traceability. Third-party inspection (SGS, TUV, BV) can be arranged upon request.
1. What is 420 stainless steel?
420 (UNS S42000, EN 1.4021) is a martensitic stainless steel with 12-14% chromium. It is a higher-carbon version of 410, capable of achieving the highest hardness (50 HRC) among the 12% chromium grades.
2. Is 420 stainless steel magnetic?
Yes. 420 is magnetic in both annealed and hardened conditions.
3. Can 420 be heat treated?
Yes. 420 is hardenable by heat treatment. Hardening involves heating to 980-1035°C, followed by oil or air quenching. Tempering at 150-370°C is then performed to achieve the required hardness. Avoid tempering in the 425-600°C range.
4. What is the maximum hardness of 420?
420 can achieve up to Rockwell 50 HRC, the highest hardness among the 12% chromium grades.
5. What thickness ranges are available for 420 plate?
Cold rolled sheet from 0.3mm to 6.0mm; hot rolled plate from 3.0mm to 100.0mm+. Heavier thicknesses available on request.
6. What documents are provided with delivery?
MTC 3.1, inspection reports, packing list, and heat number traceability.
7. Is third-party inspection available?
Yes, SGS, TUV, or BV upon request.
8. Can 420 be welded?
420 is generally not recommended for welding due to its hardenable nature, though it is possible with proper preheating (150-320°C) and post-weld heat treatment (610-760°C). Grade 309 filler rods are recommended when welding is required.
9. Is 420 resistant to corrosion?
420 offers good corrosion resistance to fresh water, mild acids, food acids, and alkalis in the hardened and polished condition. Corrosion resistance is lower than 304/316 and grade 430. Not recommended for marine or high chloride environments.
10. What are typical applications for 420?
Cutlery, surgical instruments, shear blades, valve parts, pump shafts, food processing equipment, and turbine components.
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Shangyou Stainless Steel provides custom sizes, processing, and export solutions for global B2B customers.
