X2CrNbZr17 (1.4590) Stabilized Ferritic Stainless Steel
X2CrNbZr17 (1.4590) Stabilized Ferritic Stainless Steel for High-Temperature Corrosion Resistance
Comprehensive data for X2CrNbZr17 (1.4590) stabilized ferritic stainless steel including chemistry, mechanical properties, physical properties, international equivalents, and application guide.
Cold forming, bending, deep drawing, welding, cutting
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X2CrNbZr17 Stabilized Ferritic Stainless Steel Introduction
X2CrNbZr17, designated as 1.4590 in EN 10088-1, is a niobium- and zirconium-stabilized ferritic stainless steel. The addition of Nb and Zr significantly improves resistance to intergranular corrosion after welding and enhances high-temperature oxidation resistance. This grade exhibits excellent formability, weldability, and resistance to chloride-induced stress corrosion cracking. Due to its stabilization, it maintains good mechanical properties at elevated temperatures, making it suitable for applications such as automotive exhaust systems, catalytic converter housings, and other components exposed to cyclic heating. The low carbon content (max 0.03%) combined with stabilizers prevents sensitization during welding. It is typically supplied in the annealed condition and can be processed by deep drawing, bending, and stretch forming.
X2CrNbZr17 Stabilized Ferritic Stainless Steel Chemical Composition
The chemical composition according to EN 10088-1 for grade X2CrNbZr17 (1.4590). The steel is stabilized with niobium and zirconium to improve weldability and high-temperature corrosion resistance. Typical carbon content is kept low to avoid sensitization.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.03 | Lower carbon ensures better corrosion resistance after welding. |
| Silicon (Si) | ≤ 1.00 | Silicon contributes to oxidation resistance. |
| Manganese (Mn) | ≤ 1.00 | Manganese improves hot working characteristics. |
| Phosphorus (P) | ≤ 0.040 | Impurity element; kept low to maintain toughness. |
| Sulfur (S) | ≤ 0.015 | Controlled to very low levels for improved weldability. |
| Chromium (Cr) | 16.0 – 18.0 | Primary element providing passivity and corrosion resistance. |
| Niobium (Nb) | 0.30 – 1.00 | Stabilizer that ties up carbon and nitrogen, preventing chromium carbide precipitation. |
| Zirconium (Zr) | 0.10 – 0.60 | Enhances high-temperature oxidation resistance and acts as additional stabilizer. |
X2CrNbZr17 Stabilized Ferritic Stainless Steel Thermal and Electrical Physical Properties
Representative physical properties for X2CrNbZr17 (1.4590) at ambient and elevated temperatures. These values are typical for ferritic stainless steels of this type and are based on published material data sheets. The material's low thermal expansion and good thermal conductivity are advantageous for thermal cycling applications.
| Property | Typical Value | Unit | Test Conditions |
|---|---|---|---|
| Density (ρ) | 7.7 | kg/dm³ | At 20 °C |
| Elastic Modulus (E) | 220 | GPa | At 20 °C |
| Shear Modulus (G) | 85 | GPa | At 20 °C, estimated from E and Poisson ratio |
| Poisson's Ratio (ν) | 0.3 | – | At 20 °C |
| Thermal Expansion (α) | 10.5 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal Expansion (α) | 11.0 × 10⁻⁶ | K⁻¹ | 20 – 200 °C |
| Thermal Expansion (α) | 11.5 × 10⁻⁶ | K⁻¹ | 20 – 400 °C |
| Thermal Conductivity (λ) | 25 | W/(m·K) | At 20 °C |
| Thermal Conductivity (λ) | 26 | W/(m·K) | At 100 °C |
| Thermal Conductivity (λ) | 27 | W/(m·K) | At 200 °C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρe) | 0.60 | µΩ·m | At 20 °C |
X2CrNbZr17 Stabilized Ferritic Stainless Steel Mechanical Properties
Mechanical properties as per EN 10088-2 for cold-rolled strip and sheet in the annealed condition (2D, 2B, 2R finishes). The material is designed for forming applications and exhibits good ductility. Bend test values are given as the recommended minimum bend radius without cracking.
| Property | Standard Requirement Value | Unit | Test Conditions |
|---|---|---|---|
| Yield Strength (Rp0.2) | ≥ 260 | MPa | Transverse direction, thickness ≤ 8 mm |
| Tensile Strength (Rm) | 430 – 630 | MPa | Transverse direction, thickness ≤ 8 mm |
| Elongation (A80) | ≥ 20 | % | Thickness < 3 mm, gauge length 80 mm |
| Elongation (A) | ≥ 20 | % | Thickness 3 – 8 mm, gauge length 5.65√So |
| Bend Test (180°) | d = 1 × t | – | Thickness ≤ 3 mm, minimum bending factor |
| Bend Test (180°) | d = 2 × t | – | Thickness > 3 mm, minimum bending factor |
X2CrNbZr17 Stabilized Ferritic Stainless Steel Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| Europe | EN 10088-1 | X2CrNbZr17 (1.4590) | Original designation; identical chemistry and properties. |
| International | ISO 15510 | X2CrNbZr17 | Same chemical composition limits as EN 10088-1. |
| Germany | DIN EN 10088-1 | X2CrNbZr17 (1.4590) | Adoption of EN standard; complete equivalence. |
| France | NF EN 10088-1 | X2CrNbZr17 (1.4590) | Equivalent under harmonized European standard. |
X2CrNbZr17 Stabilized Ferritic Stainless Steel Application Introduction
X2CrNbZr17 is tailored for components requiring good high-temperature oxidation resistance, thermal fatigue resistance, and corrosion resistance in mildly aggressive media. Its stabilization ensures long service life in cyclic heating environments. Typical applications focus on the automotive and thermal processing industries.
Product Applications: Car exhaust manifolds and tubing, Catalytic converter shells and heat shields, Flexible couplings for exhaust systems, Enclosures and structural housings, Flue gas chimneys and liners
Processed into products: Deep-drawn heat shield halves, Welded tubular manifolds, Formed end cones for catalytic converters, Press-formed brackets and hanger clips, Rolled rings for flanges
Application industries: Automotive (exhaust and after-treatment systems), Power generation (gas turbine exhaust components), Industrial heating equipment (burners, heat exchangers), Chemical processing (moderate corrosive media), Household appliances (oven parts, fireplace inserts)
X2CrNbZr17 Stabilized Ferritic Stainless Steel Similar or Alternative Materials with Comparable Performance
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240 | UNS S43932 | 18Cr-Nb,Ti stabilized ferritic steel; similar corrosion resistance but lacks Zr; may require evaluation for high-temperature oxidation. |
| USA | ASTM A240 | UNS S44400 | 18Cr-2Mo-Nb stabilized ferritic; improved pitting resistance due to Mo, slightly higher strength; substitute where higher corrosion resistance is needed. |
| Europe | EN 10088-1 | X2CrTiNb18 (1.4509) | Stabilized with Ti and Nb; similar high-temperature properties and weldability; can replace 1.4590 in many automotive applications. |
| Europe | EN 10088-1 | X2CrMoTi18-2 (1.4521) | Mo-alloyed ferritic grade with higher corrosion resistance; substitute when environment contains chlorides. |
| Japan | JIS G4305 | SUS430LX | 17Cr-Nb stabilized ferritic; approximate alternative but may have slightly different chemistry. |
Notes:
For optimal performance, post-weld heat treatment is not required due to stabilization. However, thorough cleaning of the weld seam is recommended to restore corrosion resistance. Forming should be done at room temperature, and severe deformation may require intermediate annealing. The material is magnetic in all conditions. Bright annealing or pickling after fabrication helps maintain surface integrity. Contact your supplier for specific batch testing if impact toughness data are needed.
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