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Stainless Steel - Grade 420B / 1.4028

Description

Stainless Steel Grade 420A/1.4021 is a martensitic stainless steel with a high carbon content, providing high hardness and strength after heat treatment. Known for its excellent corrosion resistance, particularly in mild environments, 420A is commonly used in applications requiring high wear resistance and moderate corrosion resistance. The alloy is versatile, allowing for easy fabrication and is widely employed in industries such as cutlery, surgical instruments, and other tool manufacturing.

Chemical Composition

Element Min Max
Carbon (C) 0.26 0.35
Silicon (Si) - 1.00
Phosphorus (P) 0.03 max
Manganese (Mn) - 1.50
Silicon (Si) 0.5 max
Phosphorus (P) - 0.040
Sulfur (S) - 0.030
Chromium (Cr) 12.0 14.0

Mechanical Properties

Annealed Condition (+A):

  • Hardness: ≤245 HB
  • Tensile Strength (Rm): ≤800 MPa

    • Quenched & Tempered Condition (+QT850):

  • Yield Strength (Rp0.2): ≥650 MPa
  • Tensile Strength (Rm): 850-1000 MPa
  • Elongation (A): ≥10%
  • Impact Toughness (KV) at 20°C: ≥12J

    • Thermal & Physical Properties

  • Density: 7.73 g/cm³
  • Thermal Expansion Coefficient (20-100°C): 10.2 μm/m°C
  • Electrical Resistivity: 68 Microhm-cm
  • Modulus of Elasticity: 195 GPa
  • Thermal Conductivity (at 20°C): 27.4 W/m•K

    • Other Designations

  • DIN: 1.4028 (X30Cr13)
  • AISI: 420B
  • EN: X30Cr13

    • Fabrication and Heat Treatment

  • Annealing: Heat to 840-900°C, slow furnace cool to 600°C, then air cool
  • Hardening: Heat to 980-1035°C, oil quench
  • Tempering: 150-370°C, typically 625-675°C

    • Applications

    420B / 1.4028 is commonly used for surgical and dental instruments, scissors, pump and valve parts due to its excellent hardness and corrosion resistance.

    Supplied Forms

  • Bars (round, square, flat, hexagonal, customized)
  • Precision ground rods and bars

    • Features

  • High Hardness (up to 50 HRC)
  • Good Corrosion Resistance in mild environments
  • Magnetic in annealed and heat treated conditions
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