X1CrNb15 Ferritic Stainless Steel
X1CrNb15 Ferritic Stainless Steel: EN 10088-1 Grade for High-Temperature Corrosion Resistance
Explore the composition, mechanical and thermal properties, international equivalents, and applications of X1CrNb15 ferritic stainless steel under EN 10088-1, including plate and coil forms.
Cold forming, bending, deep drawing, welding (TIG, MIG, resistance), cutting (laser, plasma)
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X1CrNb15 Ferritic Stainless Steel Introduction
X1CrNb15 is a niobium-stabilized ferritic stainless steel defined in EN 10088-1. Its low carbon content (<0.02%) combined with niobium addition provides excellent resistance to intergranular corrosion and sensitisation during welding. The 14–16% chromium content ensures good oxidation resistance up to approximately 800°C, making it suitable for elevated-temperature service. This grade combines moderate strength, good ductility, and thermal fatigue resistance. It is typically supplied in the annealed condition and is widely used in automotive exhaust systems, heat exchangers, and industrial components requiring weldability without post-weld heat treatment.
X1CrNb15 Ferritic Stainless Steel Chemical Composition
The chemical composition conforms to the ladle analysis limits specified in EN 10088-1 for grade X1CrNb15 (material number 1.4595). The low carbon content combined with niobium stabilization suppresses chromium carbide precipitation, ensuring corrosion resistance after welding. Residual elements are tightly controlled for optimal performance.
| Element | Standard Value (wt.%) | Remarks |
|---|---|---|
| C | ≤ 0.020 | Carbon, max |
| Si | ≤ 0.50 | Silicon, max |
| Mn | ≤ 0.50 | Manganese, max |
| P | ≤ 0.040 | Phosphorus, max |
| S | ≤ 0.015 | Sulfur, max |
| Cr | 14.0 – 16.0 | Chromium |
| Ni | ≤ 0.50 | Nickel, max |
| Nb | 0.20 – 0.60 | Niobium |
| N | ≤ 0.015 | Nitrogen, max |
X1CrNb15 Ferritic Stainless Steel Thermal and Electrical Physical Properties
Physical properties for X1CrNb15 are representative for ferritic stainless steels and suitable for design calculations. Values are given at room temperature unless a temperature range is specified. Data are derived from published literature and align with typical behaviour of the 1.4595 grade.
| Property | Standard Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.70 | g/cm³ | 20 °C |
| Elastic modulus (E) | 200 | GPa | 20 °C |
| Shear modulus (G) | 77 | GPa | 20 °C (calculated) |
| Poisson's ratio (ν) | 0.3 | — | 20 °C |
| Thermal expansion coefficient (α) | 10.5 | 10⁻⁶/K | 20 – 100 °C |
| Thermal expansion coefficient (α) | 11.0 | 10⁻⁶/K | 20 – 300 °C |
| Thermal expansion coefficient (α) | 11.5 | 10⁻⁶/K | 20 – 500 °C |
| Thermal conductivity (λ) | 25 | W/(m·K) | 20 °C |
| Thermal conductivity (λ) | 26 | W/(m·K) | 500 °C |
| Specific heat capacity (c) | 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρₑ) | 0.60 | µΩ·m | 20 °C |
X1CrNb15 Ferritic Stainless Steel Mechanical Properties
The following mechanical properties are for X1CrNb15 in the solution-annealed condition (+A) at room temperature, as defined in EN 10088-2 for flat products (plate/coil). Values apply in the longitudinal direction for thicknesses ≤ 6 mm, unless otherwise indicated. Hardness and bend test data supplement the tensile requirements.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| 0.2% proof strength (Rp0.2) | ≥ 180 | MPa | Room temperature |
| Tensile strength (Rm) | 380 – 560 | MPa | Room temperature |
| Elongation (A80) | ≥ 20 | % | Gauge length 80 mm, thickness ≤ 3 mm |
| Elongation (A) | ≥ 20 | % | Gauge length 5.65√S₀, thickness > 3 mm |
| Hardness | ≤ 180 | HBW | Annealed condition |
| Hardness | ≤ 88 | HRB | Annealed condition (for reference) |
| Bend test | 180°; mandrel diameter = thickness | — | Thickness ≤ 5 mm, no cracks |
X1CrNb15 Ferritic Stainless Steel Completely Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10088-1 | X1CrNb15 (1.4595) | Original specification; fully equivalent within EN system. |
X1CrNb15 Ferritic Stainless Steel Application Introduction
X1CrNb15 is tailored for environments that demand both corrosion resistance and thermal stability. Its low interstitial content and Nb stabilization allow it to be formed, welded, and used at elevated temperatures without loss of ductility or protection. The following industries and products highlight its versatility.
Product Applications: Exhaust manifolds, flanges, and pipes, Catalytic converter substrates and shields, Heat exchanger plates and tubes, Combustion chamber liners, Domestic appliance oven cavities and hobs, Industrial chimney liners and air ducts
Processed into products: Welded exhaust tube assemblies, Stamped heat exchanger plates, Deep-drawn household appliance parts, Laser-cut brackets and flanges, Roll-formed structural channels for ducting, Bent tubes for cooling circuits
Application industries: Automotive (exhaust and after-treatment systems), Heat exchanger and boiler manufacturing, Household appliances (oven liners, burner parts), Power generation (heat recovery steam generators), Industrial engineering (ducting, chimney flues), Food processing equipment (where moderate corrosion resistance is sufficient)
X1CrNb15 Ferritic Stainless Steel Similar or Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240/A240M | UNS S43035 (Type 439) | Ti-stabilized ferritic with 17–19% Cr; similar weldability but higher Cr, slightly different corrosion resistance. |
| USA | ASTM A240/A240M | UNS S44400 (Type 444) | Mo + Nb stabilized ferritic with 17.5–19.5% Cr; enhanced pitting resistance. |
| Europe | EN 10088-1 | X3CrTi17 (1.4510) | Ti-stabilized ferritic with 16–18% Cr; widely used for exhausts, slightly higher carbon. |
| Europe | EN 10088-1 | X2CrTiNb18 (1.4509) | Dual-stabilized (Ti+Nb) ferritic with 17.5–18.5% Cr; excellent intergranular corrosion resistance. |
| Japan | JIS G4304/G4305 | SUS 430J1L | Low-C, Nb-stabilized 16–18% Cr grade; comparable application range. |
Notes:
Surface conditions according to EN 10088-2: 1D (hot rolled, heat treated, pickled), 2D (cold rolled, heat treated, pickled), 2B (cold rolled, heat treated, pickled, skin passed), 2R (bright annealed). The grade is highly weldable using all common processes, with filler metal matching the base composition (e.g., 1.4595) recommended. Post-weld heat treatment is usually not necessary due to Nb stabilization. For deep drawing, lubrication and tool clearance typical of ferritic stainless are required to avoid galling. Maximum service temperature in air is approximately 800°C for oxidation resistance; mechanical properties should be verified at design temperature.
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