| Customization: | Available |
|---|---|
| Type: | Round Bar |
| Standard: | AISI, DIN, JIS, GB |
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SKD61 steel is classified as a hot work tool steel under the JIS G4404 standard. As a high-chromium alloy tool steel, SKD61 offers excellent hardness and wear resistance even at elevated temperatures after heat treatment. Its superior machinability and polishability make it an ideal choice for manufacturing high-precision molds with long service life.
Typically, SKD61 steel is supplied in an annealed condition, featuring a hardness below 229 HBW, which facilitates easier machining and processing before final heat treatment.
| ZEICIN Grade | AISI | DIN | JIS | GB |
| SKD61 | ASTM A681/ H13 | 1.2344/ X40CrMoV5-1 | G4404 | 4Cr5MoSiV1 |
| C | Mo | Cr | V | Co | Al | Mn | Si | S | P |
|---|---|---|---|---|---|---|---|---|---|
| 0.35-0.42 | 1.00-1.50 | 4.80-5.50 | 0.80-1.15 | - | - | 0.25-0.50 | 0.80-1.220 | ≤0.02 | ≤0.03 |
Critical Transformation Temperatures
Ac1: 845°C
Ac3: 870°C
Ms: 270°C
Heat Treatment Temperatures and Processes
Annealing: 820-870°C, furnace cooling, hardness ≤229 HBW
Quenching: 1020-1050°C, oil or air quench, hardness after quenching 56-58 HRC
Tempering: 560-580°C, double tempering, hardness 50-55 HRC
Cryogenic Treatment
Immediately after quenching, deep cool at -70 to -80°C for 3-4 hours, then temper
Increases hardness by 1-3 HRC and improves dimensional stability
Risk of cracking for complex or large parts during cryogenic treatment
Nitriding Treatment
Forms a hardened surface layer with high hardness (~70 HRC) and some corrosion resistance after nitriding
| Process | Temperature | Cooling Method | Hardness |
| Annealing | 820-870°C | Furnace cooling | ≤229 HBW |
| Quenching | 1020-1050°C | Oil or air quench | 56-58 HRC |
| Tempering | 560-580°C | - | 50-55 HRC |
| Cryogenic Treatment | -70 to -80°C | Hold 3-4 hours | +1-3 HRC increase |
| Nitriding | - | - | Surface ~70 HRC |
High Performance at Competitive Pricing
Our SKD61 Tool Steel offers excellent thermal conductivity, toughness, and wear resistance at a cost-effective price. It is ideal for manufacturing hot forging dies, extrusion dies, and die casting molds, providing outstanding performance without the premium cost.
Precision Manufacturing Process
We use advanced steelmaking and processing techniques to ensure high-quality SKD61 steel with a uniform microstructure and enhanced toughness. SKD61 is perfect for high-temperature applications like forging, extrusion, and die casting.
Controlled Heat Treatment
Our precise heat treatment process achieves hardness in the range of 56-58 HRC after tempering, improving wear resistance and ensuring reliable tool performance under demanding conditions.
Strict Quality Control
We enforce rigorous quality control throughout every production stage to ensure consistent mechanical properties, uniform microstructure, and dimensional accuracy.
Compliance with Global Standards
Our SKD61 Tool Steel meets international standards, including JIS G4404, ASTM, DIN, and GB, making it a trusted choice for industries such as automotive, aerospace, and manufacturing.
Continuous Process Optimization
We continuously enhance our manufacturing processes to meet evolving industry requirements while maintaining high performance and reliability.
Customized Solutions
SKD61 Tool Steel is available in round bars, flat bars, sheets, and blanks, with customizable heat treatments and surface finishes to meet your specific application needs.
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