420 Stainless Steel Plate

Walmay 420 stainless steel plate is available in standard 2B and NO.1 finishes, with optional customized polishing and grinding treatments.

Manufactured under ASTM and GB/T dual standards, it is stocked in thicknesses from 0.5mm to 16mm.

  • High Hardness & Long Wear Life

    Walmay testing shows 3× higher wear resistance than 304, suitable for high-friction industrial parts, reducing maintenance frequency.

  • Cost-Effective Performance

    Nickel-free composition makes 420 around 50% cheaper than 316L, providing strong performance at a controlled cost.

  • Flexible Supply & Fast Response

    Over 200 tons of common specifications (1.0–6mm × 1219/1250mm) in stock, available for shipment within 24 hours.

Product Specifications

Chemical Composition (GB/T 1220-2007)
Element C Si≤ Mn≤ P≤ S≤ Cr
Content (%) 0.26–0.35 1 1 0.04 0.03 12.0–14.0
Physical & Mechanical Properties
Property Annealed Quenched & Tempered Standard
Density 7.75 g/cm³ 7.75 g/cm³ GB/T 7999
Melting Point 1480–1530℃ 1480–1530℃ -
Tensile Strength ≥630 MPa ≥1200 MPa GB/T 228.1-2021
Yield Strength ≥440 MPa ≥950 MPa GB/T 228.1-2021
Elongation ≥20% ≥10% GB/T 228.1-2021
Hardness (HB / HRC) ≤223 HB HRC 50–55 GB/T 231.1-2009
Salt Spray Resistance (Neutral) ≥200h ≥250h ASTM B117
Specifications & Supply
Process Type Thickness (mm) Width (mm) Length (mm) Surface Finish Tolerance
Cold Rolled 0.5–6.0 1000/1219/1250 (Mill Edge) 2000/2440/3000 2B / Polished (Ra≤1.6μm) ±0.02mm
Hot Rolled 6.0–16.0 1500/1800/2000 6000 (fixed) NO.1 (Pickled) ±0.1mm

Customization Services:

Supports slitting (min width 50mm), laser cutting (any shape), and precision heat treatment. Hardness can be customized between HRC 45–55, eliminating additional post-processing. Custom widths up to 1500mm can be delivered within 7 days.

Pricing Calculation

Workshop & Manufacturing Machine

Stainless Steel Plate Bending/Stamping Process

Stainless Steel Plates on Storage Rack

Palletized Stainless Steel Plates

Stainless Steel Plate Rolling Line

Precision Thickness Inspection of Stainless Steel Plate

Forklift Loading Stainless Steel Plates for Shipment

Product Applications

  • Cutting Tools & Blades

    Specification: 2.0mm × 1219 × 2440mm

    Case: Used for kitchen knife blades. After quenching, hardness reached HRC 52, maintaining sharpness twice as long as carbon steel and reducing material loss by 15%.

  • Wear-Resistant Components

    Specification: 5.0mm × 1500 × 6000mm

    Case: Applied in textile machinery guides. Walmay customized quenching achieved 3-year wear life, lowering maintenance cost by 60%.

  • Mold Inserts

    Specification: 3.0mm × 1219 × 2440mm

    Case: Used for stamping mold inserts. Polished surface (Ra≤0.8μm) ensured smooth release and extended mold service life to 18 months.

  • Valve Seals

    Specification: 4.0mm × 1219 × 2440mm

    Case: Employed in industrial valve sealing rings. Hot-rolled 420 plate provided excellent hardness and moderate corrosion resistance, extending replacement intervals from 3 months to 1 year.

FAQs

What makes 420 stainless steel different from 410?
420 contains higher carbon (0.26–0.35%), which allows it to achieve higher hardness after heat treatment—up to HRC 55—making it better suited for cutting and wear applications.
Can 420 stainless steel be polished to a mirror finish?
Yes. Its fine grain structure allows high-gloss polishing, often used in decorative and tooling applications.
What heat treatment options are available for 420 plates?
Walmay provides quenching and tempering with hardness adjustable between HRC 45–55 depending on the application.
Is 420 stainless steel magnetic?
Yes. As a martensitic steel, 420 exhibits strong magnetism in both annealed and hardened states.
What are typical uses for 420 stainless steel plates?
Commonly used in knife blades, wear plates, pump shafts, molds, and mechanical seals requiring both hardness and moderate corrosion resistance.
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