The 1.4021 (X20Cr13) material is primarily equivalent to AISI 420 (or 420A/420S37), a martensitic stainless steel. It is a 12-14% chromium steel that provides good corrosion resistance and high strength, commonly used for fasteners, shafts, and cutlery.
X20Cr13 (material number 1.4021) is a martensitic stainless steel, commonly known as AlSI 420. It possesses high hardness, good wear resistance, and moderate corrosion resistance, with a carbon content of approximately 0.16%-0.25% and a chromium content of approximately 12%-14%. It is magnetic, heat-treatable, and commonly used in the manufacture of tableware, pump shafts, valves, and fasteners.
| Element | Symbol | Content (%) |
| Carbon | C | 0.16 – 0.25 |
| Chromium | Cr | 12.00 – 14.00 |
| Manganese | Mn | ≤ 1.50 |
| Silicon | Si | ≤ 1.00 |
| Phosphorus | P | ≤ 0.040 |
| Sulfur | S | ≤ 0.030 (standard) / 0.015 (for better finish) |
| Iron | Fe | Balance |
Values vary based on the heat treatment condition (Quenched and Tempered - QT).
| Condition | Yield Strength (Rp0.2) | Tensile Strength (Rm) | Elongation (A5) | Impact Strength (ISO-V) | Hardness (HB) |
| Annealed (+A) | - | max. 760 MPa | - | - | max. 230 |
| QT 700 | ≥ 500 MPa | 700 – 850 MPa | ≥ 13% | ≥ 25 J | 215 – 260 |
| QT 800 | ≥ 600 MPa | 800 – 950 MPa | ≥ 12% | ≥ 20 J | 245 – 300 |
| Property | Value | Unit |
| Density | 7.73 |
g/cm3 |
| Modulus of Elasticity | 215 |
GPa |
| Thermal Conductivity | 30 |
W/(m⋅K) |
| Specific Heat Capacity | 460 |
J/(kg⋅K) |
| Electrical Resistivity | 0.60 |
Ω⋅mm2/m |
| Magnetic Properties | Ferromagnetic | Yes |
| Process | Temperature Range | Cooling Method |
| Soft Annealing | 745°C – 825°C | Furnace (Slow cooling) |
| Hardening | 950°C – 1050°C | Oil or Air |
| Tempering (QT 700) | 650°C – 750°C | Air |
| Tempering (QT 800) | 600°C – 700°C | Air |
| Hot Forming (Forging) | 1100°C – 800°C | Slow cooling |
1.4021 (X20Cr13) and AISI 420 are essentially equivalent martensitic stainless steels, often used interchangeably, featuring ~13% chromium for moderate corrosion resistance and high hardenability. The primary distinction is that "1.4021" refers to the European EN standard, while "420" is the AISI/ASTM designation, with 420 often covering a wider range of carbon variants (e.g., 420A, 420B, 420C).
1.4021 (X20Cr13) is a martensitic, heat-treatable stainless steel, commonly known as a general-purpose grade with good corrosion resistance in mild environments and high strength, often utilized in cutlery, surgical instruments, pump shafts, and automotive parts. It is frequently utilized in mechanical engineering for valves, fasteners, and gears.
We have in-depth cooperation with major steel mills such as TISCO, Baosteel, and Tsingshan, ensuring reliable raw material sourcing. We typically maintain large stock of commonly used martensitic stainless steels such as 1.4021, shortening delivery times, and provide complete MTC (Mill Test Certificates) conforming to EN 10204 3.1 standards.
Third-Party Testing: We support on-site testing by international testing organizations such as SGS, BV, and TUV (spectral analysis, hardness testing, ultrasonic testing, etc.).
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