420 Stainless Steel Round Bars

420 stainless steel round bars are martensitic, known for high hardness and corrosion resistance. They possess a tensile strength of 655 MPa and a maximum carbon content of 0.15%.

420 stainless steel round bars, known for their martensitic structure, high hardness, and corrosion resistance, are commonly utilized in surgical instruments, cutting tools, molds, and valve components.

Chemical Compositions (in%):

Applications: 420 stainless steel round bars are commonly used in applications requiring high hardness, strength, and wear resistance. Some typical applications include:

• Surgical instruments
• Cutting tools
• Molds
• Valve components

Grade and Type:

• Grade: 420 Stainless Steel
• Type: Martensitic stainless steel

Physical Properties:

• Density: 7.75 g/cm³
  • Density refers to the mass per unit volume of the material.
• Melting Point: 1450°C (2640°F)
  • Melting point is the temperature at which the material changes from a solid to a liquid state.
• Specific Heat Capacity: 460 J/kg·K (0-100°C)
  • Specific heat capacity is the amount of heat required to raise the temperature of a unit mass of the material by one degree Celsius.
• Thermal Conductivity: 24.9 W/m·K (100°C)
  • Thermal conductivity is the ability of the material to conduct heat.

Mechanical Properties:

• Tensile Strength: 655 MPa (95,000 psi)
  • Tensile strength is the maximum amount of tensile (stretching) stress a material can withstand before breaking.
• Yield Strength (0.2% Offset): 415 MPa (60,200 psi)
  • Yield strength is the stress at which a material begins to deform plastically.
• Elongation at Break: 20%
  • Elongation at break is the percentage increase in length of the material before it fractures under tension.
• Hardness, Rockwell C: 50-55
  • Hardness indicates the resistance of the material to deformation or scratching.

Chemical Composition:

• Carbon (C): 0.15% maximum
  • Carbon content affects the hardness and strength of the material.
• Chromium (Cr): 12.0-14.0%
  • Chromium provides corrosion resistance and hardenability.
• Manganese (Mn): 1.0% maximum
  • Manganese enhances hardenability and tensile strength.
• Silicon (Si): 1.0% maximum
  • Silicon improves strength and oxidation resistance.
• Phosphorus (P): 0.04% maximum
  • Phosphorus can improve machinability but may reduce corrosion resistance.
• Sulfur (S): 0.03% maximum
  • Sulfur can improve machinability but may reduce toughness.

Applications:

• 420 stainless steel round bars are commonly used in applications requiring high hardness, strength, and wear resistance.
• Typical applications include surgical instruments, cutting tools, molds, and valve components.

Heat Treatment:

• Annealing: 815-900°C, followed by slow furnace cooling to avoid cracking.
• Hardening: 980-1065°C, followed by quenching in oil or air.
• Tempering: 150-370°C to improve toughness and ductility.