1. Key Properties:
Martensitic Stainless Steel: X20Cr13 (1.4021) is a martensitic stainless steel that combines moderate corrosion resistance with high strength, making it suitable for parts that require both mechanical properties and some degree of corrosion resistance.
Good Hardening Properties: This grade can be hardened through heat treatment, offering a balance between hardness and toughness.
Moderate Corrosion Resistance: While it has better corrosion resistance than standard carbon steels, it is not as resistant as austenitic stainless steels, making it suitable for moderate corrosion environments.
Good Strength and Toughness: Offers high tensile strength and toughness after heat treatment, making it suitable for applications where mechanical properties are crucial.
Good Wear Resistance: With the right heat treatment, X20Cr13 provides good wear resistance, making it suitable for components subject to friction and wear.
Weldability: X20Cr13 has fair weldability, though preheating may be required for thicker sections to avoid cracking and ensure weld integrity.
2. Applications/Industries:
Automotive: Used in automotive components such as exhaust valves, turbine blades, and other high-temperature applications that require strength and moderate corrosion resistance.
Industrial Equipment: X20Cr13 is used in various industrial components like pumps, valves, and pressure vessels, where both strength and corrosion resistance are important.
Oil & Gas: It is used in oil and gas equipment, such as wellheads and valves, that are exposed to moderate corrosive environments and need good mechanical properties.
Heavy Machinery: This material is used for parts in heavy machinery, such as gears, shafts, and rollers, that require a balance of strength, wear resistance, and corrosion resistance.
Heat-Resistant Components: Due to its moderate heat resistance and mechanical properties, X20Cr13 is used in components exposed to high temperatures, such as heat exchangers and turbine parts.
3. Certifications/Standards:
DIN 17440: X20Cr13 (1.4021) complies with the DIN 17440 standard for martensitic stainless steels, ensuring it meets the required chemical composition and mechanical properties.
ISO 9001: Quality management system certification.
4. Chemical Composition:
Carbon (C): 0.20% – 0.25%
Chromium (Cr): 12.00% – 14.00%
Manganese (Mn): 0.50% max
Silicon (Si): 0.80% max
Phosphorus (P): 0.040% max
Sulfur (S): 0.030% max
Iron (Fe): Balance
5. Technical Specifications:
Yield Strength:
X20Cr13 (1.4021): 450–600 MPa (depending on heat treatment and thickness)
Tensile Strength:
X20Cr13 (1.4021): 600–850 MPa (depending on hardness and heat treatment)
Hardness:
X20Cr13 (1.4021): After heat treatment, it can reach 50–58 HRC (Rockwell hardness), making it suitable for wear-resistant applications.