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- Stainless Steel 420
Stainless Steel 420
Material Type
Metal
Material Name
Stainless Steel 420
Alternative Names
S42000 | X20Cr13 | 1.4021 | X30Cr13 | 1.4028 | X46Cr13 | 1.4034
Process Compatibility
CNC Milling, CNC Turning
introduction
Stainless Steel 420 in CNC Machining
Stainless steel 420 comes in various grades, with the most common ones being 420A, 420B, and 420D. These versions differ in carbon content, affecting their hardness after heat treatment.
For instance, 420A or X20Cr13 has ~0.20% carbon and reaches 48-50 HRC hardness. 420B, or X30Cr13 with ~0.30% carbon, achieves 50-52 HRC. 420D or X46Cr13 with ~0.46% carbon, reaches 52-54 HRC. The carbon percentage is denoted in the EN norm (e.g., X20Cr13 means 0.20% carbon). Higher carbon increases hardness but reduces corrosion resistance; 420D has lower corrosion resistance than 420A due to its higher carbon content.
Stainless steel 420 has good machinability but tends to distort because of its high hardness, so we use coated carbide tools with a high cutting speed and low feed rate for turning, milling, and drilling operations. We use proper fixturing to minimize vibrations and maintain dimensional accuracy. We also use water-soluble cutting fluids to dissipate heat and prolong tool life. Heat treatment is applied to improve hardness and other mechanical properties. We use chip breakers and control the chip size to avoid chip nesting and tool wear. We do polishing or grinding for a smoother surface finish. We also do post-process annealing to relieve stresses and enhance corrosion resistance.
Properties
Properties Table of Stainless Steel 420
MECHANICAL PROPERTIES | |
---|---|
Ultimate Tensile Strength | 485-750 MPa |
Yield Strength | 275-380 MPa |
Young's Modulus(Elasticity) | 190-205 GPa |
Elongation at Break | 15-20 % |
Physical Properties | |
Corrosion Resistance | Moderate |
Magnetism | Magnetic |
UV Resistance | Excellent |
Weldability | Good |
Thermal Properties | |
Maximum Service Temperature | 144-194 °C |
Thermal Expansion Coefficient | 9-11 x 10^-6/°C |
Thermal Conductivity | 23-27 W/(m·°C) |
Electrical Properties | |
Electrical Resistivity | 49-60 μΩ*cm |
TECHNOLOGY OVERVIEW
Basic Knowledge of Stainless Steel 420
What is Stainless Steel 420?
Stainless Steel 420 is a type of strong and hard martensitic stainless steel with high durability. It is composed of around 0.15% to 0.40% carbon, 12% to 14% chromium, and small amounts of manganese, silicon, phosphorus, and sulfur.
This steel is also known for its excellent wear resistance and corrosion resistance, which is why it's used in cutlery and surgical instruments. Its hardness can be adjusted through heat treatment.
Advantages of Stainless Steel 420
Contains chromium for excellent corrosion resistance.
High hardness and strength, especially after heat treatment.
Good wear resistance
Belongs to martensitic class, can be hardened by heat treatment.
Relatively easy to machine for precise dimensions and shapes.
More cost-effective compared to some high-performance stainless steels.
Shows good resistance to certain chemicals.
Retains mechanical properties at elevated temperatures.
Applications of Stainless Steel 420
Mold and Die Components
Medical Instruments
Textile Industry
Aerospace Components
Pump and Valve Parts
Shafts and Bushings
Fasteners
Sporting Goods
Automotive Components
FAQ
Machining Stainless Steel 420 Buying FAQ
Other Materials
Stainless Steel 316
Stainless Steel 316, also known as marine-grade stainless steel, is a popular material in CNC machining due to its good mechanical properties
Stainless Steel 304
Stainless Steel 304 is a commonly used material in CNC machining. It is known for its corrosion resistance and mechanical properties.
Stainless Steel 2205 Duplex
Stainless Steel 2205 Duplex is a corrosion-resistant alloy made up of chromium, nickel, molybdenum, and manganese.
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