022Cr18NbTi Ferritic Stainless Steel
022Cr18NbTi Ferritic Stainless Steel: GB/T 4237 Plate & Coil Data
Comprehensive technical data for 022Cr18NbTi ferritic stainless steel according to GB/T 4237, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Hot rolling, cold rolling, annealing, welding, deep drawing, bending, forming
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022Cr18NbTi Ferritic Stainless Steel Introduction
022Cr18NbTi is a stabilized ferritic stainless steel containing niobium and titanium, designed to offer excellent resistance to intergranular corrosion, good formability, and high-temperature oxidation resistance. With a low carbon content (<0.03%) and dual stabilization, it prevents sensitization during welding and high-temperature exposure. Typical applications include automotive exhaust systems, kitchenware, and architectural panels. The material is typically supplied in the annealed condition and complies with GB/T 4237 for hot-rolled stainless steel plates and coils.
022Cr18NbTi Ferritic Stainless Steel Chemical Composition
The chemical composition conforms to GB/T 4237 and GB/T 20878-2007 for grade 022Cr18NbTi (S11873). Dual stabilization with Nb+Ti ensures immunity to intergranular corrosion. All elements are controlled to achieve a fully ferritic microstructure at room temperature.
| Element | Specified Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.030 | Low carbon for weldability and corrosion resistance |
| Silicon (Si) | ≤ 1.00 | Deoxidizer and improves oxidation resistance |
| Manganese (Mn) | ≤ 1.00 | Austenite former, aids hot workability |
| Phosphorus (P) | ≤ 0.040 | Impurity control |
| Sulfur (S) | ≤ 0.030 | Impurity control, low S for improved ductility |
| Chromium (Cr) | 17.50 – 19.50 | Primary ferrite stabilizer and corrosion resistance element |
| Nickel (Ni) | ≤ 0.60 | Residual austenite former, kept low for ferritic structure |
| Nitrogen (N) | ≤ 0.030 | Interstitial element, kept low to avoid embrittlement |
| Titanium (Ti) | 0.10 – 0.60 | Stabilizer, combines with carbon and nitrogen |
| Niobium (Nb) | ≥ 0.30 * | Stabilizer; typically 0.30–0.60, prevents sensitization |
022Cr18NbTi Ferritic Stainless Steel Physical Properties
Physical properties are typical reference values for 022Cr18NbTi in the annealed condition. These data are not mandatory in GB/T 4237 but are widely accepted based on alloy characteristics. The material exhibits a stable ferritic structure up to approximately 850°C, with good thermal conductivity and moderate thermal expansion, making it suitable for thermal cycling applications.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.70 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 200 | GPa | 20°C |
| Shear Modulus (G) | 77 | GPa | 20°C (calculated) |
| Poisson's Ratio (ν) | 0.27 | - | 20°C |
| Coefficient of Thermal Expansion (α) | 10.5 | 10⁻⁶/K | 20 – 100°C |
| Thermal Conductivity (λ) | 25.0 | W/(m·K) | 100°C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρₑ) | 0.60 | μΩ·m | 20°C |
022Cr18NbTi Ferritic Stainless Steel Mechanical Properties at Room Temperature
Mechanical properties are in accordance with GB/T 4237 for plates/coils up to specified thickness. Values are minimum requirements unless noted. Testing is performed on annealed material in the transverse direction. Yield strength refers to 0.2% proof strength Rp0.2. For bending tests, the material must withstand 180° bending without cracking.
| Property | Required Value | Unit | Test Conditions |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 420 | MPa | Room temperature, flat specimen |
| Yield Strength (Rp0.2) | ≥ 250 | MPa | Room temperature |
| Elongation (A) | ≥ 23 | % | Gauge length 50 mm, thickness ≤ 8 mm |
| Hardness | ≤ 200 HBW / ≤ 200 HV | - | Annealed condition |
| Bending Test (180°) | Crack-free | - | Bend radius = 1 × thickness (t ≤ 12.7 mm) |
022Cr18NbTi Ferritic Stainless Steel Complete Equivalent Materials by International Standards
| Country/Region | Standard | Grade / Designation | Remarks |
|---|---|---|---|
| China | GB/T 4237, GB/T 3280 | 022Cr18NbTi (S11873) | Original grade, Nb+Ti stabilized ferritic stainless steel |
| Europe | EN 10088-2, EN 10088-3 | 1.4509 – X2CrTiNb18 | Identical composition, Nb+Ti stabilization, ferritic |
| USA | ASTM A240/A240M | UNS S43940 | 18Cr-Cb-Ti, full equivalent, also in ASTM A268 |
| Japan | JIS G4304 / G4305 | SUS 430LX | Very close match, mainly Nb-stabilized; may lack Ti in some production, check specification |
| International | ISO 15510 | X2CrTiNb18 | Harmonized designation identical to EN |
022Cr18NbTi Ferritic Stainless Steel Application Introduction
022Cr18NbTi is widely chosen for applications requiring resistance to high-temperature oxidation, good formability, and immunity to intergranular corrosion after welding. Its Nb+Ti stabilization provides longevity in cyclic heating and exposure to corrosive condensates. The alloy can be formed into complex shapes via deep drawing and bending, and it is readily weldable by standard methods (TIG, MIG, resistance welding) without post-weld annealing.
Product Applications: Exhaust pipes and silencers, Kitchen sinks and countertops, Architectural panels and rolled profiles, Heat exchanger components (tubes, fins), Storage tanks for mildly corrosive liquids, Automotive trim and decorative trim
Processed into products: Deep-drawn cups, sinks, and bowls, Welded tubes and piping, Stamped muffler brackets and end caps, Laser-cut flanges and brackets, Bent profiles and roll-formed sections, Finned tubes for waste heat recovery
Application industries: Automotive industry (exhaust systems, mufflers, catalytic converter shells), Architecture and construction (roofing, cladding, flashings, escalators), Food & beverage processing (sinks, tableware, conveyor parts), Chemical and petrochemical (heat exchanger tubes, pressure vessels for moderate corrosive media), Household appliances (oven liners, washing machine drums), Power generation (waste heat recovery systems, chimneys)
022Cr18NbTi Ferritic Stainless Steel Similar Alternative Ferritic Stainless Steels
| Country/Region | Standard | Grade / Designation | Characteristics and Comparison |
|---|---|---|---|
| China | GB/T 4237 | 019Cr19Mo2NbTi (S11972) | Higher Cr and Mo, better pitting resistance; used in aggressive environments |
| China | GB/T 4237 | 022Cr18Ti (S11863) | Ti stabilized only, no Nb, lower cost; slightly lower high-temperature strength |
| Europe | EN 10088-2 | 1.4003 – X2CrNi12 | Lower Cr (12%), duplex-like but ferritic; less corrosion resistance, more economic |
| USA | ASTM A240 | UNS S43035 (439) | Ti stabilized, no Nb, good oxidation resistance; common for automotive exhaust |
Notes:
This ferritic stainless steel cannot be hardened by heat treatment and is magnetic. Surface finish options include No.1, 2D, 2B, and BA, with bright annealing available for cold-rolled products. For welding, filler metals matching AWS ER439 or ER430Ti are recommended. Post-weld heat treatment is usually unnecessary due to stabilization, but stress relieving at 750–850°C may be applied for thick sections. Long-term exposure at 400–500°C may cause 475°C embrittlement; avoid prolonged service in that range.
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