06Cr18Ni11Nb (0Cr18Ni11Nb) Stainless Steel Plate/Coil per GB/T 4237
06Cr18Ni11Nb (0Cr18Ni11Nb) Stainless Steel Plate/Coil per GB/T 4237 - Properties & Cross-References
Detailed data sheet for 06Cr18Ni11Nb (0Cr18Ni11Nb) austenitic stainless steel plate/coil under GB/T 4237, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Hot rolling, cold rolling (for thinner gauges), welding, forming, machining, solution annealing
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06Cr18Ni11Nb Stainless Steel Plate/Coil per GB/T 4237 Introduction
06Cr18Ni11Nb (previously designated 0Cr18Ni11Nb) is a niobium-stabilized austenitic stainless steel supplied as hot-rolled plate or coil per GB/T 4237. The addition of niobium prevents intergranular corrosion caused by chromium carbide precipitation during welding or elevated-temperature service. It exhibits excellent resistance to a wide range of corrosive environments, good high-temperature strength, and superior weldability. Typical applications include chemical processing equipment, pressure vessels, heat exchangers, and components exposed to temperatures up to about 800°C. The alloy is the Chinese counterpart to the internationally recognized 347 (UNS S34700) grade.
06Cr18Ni11Nb Stainless Steel Plate/Coil per GB/T 4237 Chemical Composition
Chemical requirements according to GB/T 4237 for 06Cr18Ni11Nb. The niobium content is closely tied to the carbon level to ensure effective stabilization: Nb ≥ 10×C and is generally limited to a maximum of 1.10%. Other elements are controlled to maintain austenitic structure and corrosion resistance. All values are ladle analysis and expressed as weight percent.
| Element | Specified Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Low carbon for weldability, stabilized by Nb |
| Silicon (Si) | ≤ 1.00 | Deoxidizer, ferrite control |
| Manganese (Mn) | ≤ 2.00 | Austenite former, deoxidizer |
| Phosphorus (P) | ≤ 0.045 | Impurity control |
| Sulfur (S) | ≤ 0.030 | Impurity, machinability influence |
| Chromium (Cr) | 17.00 – 19.00 | Primary element for corrosion resistance |
| Nickel (Ni) | 9.00 – 12.00 | Stabilizes austenitic phase |
| Niobium (Nb) | 10×C – 1.10 | Stabilizer, prevents chromium carbide precipitation |
06Cr18Ni11Nb Stainless Steel Plate/Coil per GB/T 4237 Thermal & Electrical Physical Properties
Representative physical data for 06Cr18Ni11Nb (similar to 347) at room temperature and elevated temperatures. Values are based on published data for the stabilized niobium-bearing grade and serve as engineering estimates. Actual properties may vary slightly with processing and exact composition.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.90 | g/cm³ | At 20°C |
| Modulus of elasticity (E) | 193 | GPa | At 20°C |
| Shear modulus (G) | 77 | GPa | Calculated from E and Poisson |
| Poisson's ratio (ν) | 0.30 | – | At 20°C |
| Coefficient of thermal expansion (α) | 16.5 | 10⁻⁶/K | 20–100°C |
| Coefficient of thermal expansion (α) | 17.5 | 10⁻⁶/K | 20–300°C |
| Coefficient of thermal expansion (α) | 18.0 | 10⁻⁶/K | 20–500°C |
| Thermal conductivity (λ) | 16.2 | W/(m·K) | At 100°C |
| Thermal conductivity (λ) | 21.5 | W/(m·K) | At 500°C |
| Specific heat capacity | 500 | J/(kg·K) | At 20°C |
| Electrical resistivity (ρe) | 0.73 | μΩ·m | At 20°C |
06Cr18Ni11Nb Stainless Steel Plate/Coil per GB/T 4237 Mechanical Properties
Typical room-temperature tensile and hardness properties as specified in GB/T 4237 for 06Cr18Ni11Nb plate/coil in the solution-annealed condition. Values apply to thickness ranges as noted. The material exhibits high ductility and good formability. For thick sections or special applications, additional bend testing may be required.
| Property | Specified Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield strength (Rp0.2) | ≥ 205 | MPa | Transverse test, room temperature, thickness ≤ 75 mm |
| Tensile strength (Rm) | ≥ 520 | MPa | Transverse test, room temperature, thickness ≤ 75 mm |
| Elongation (A) | ≥ 40 | % | Gauge length 50 mm, thickness ≤ 75 mm |
| Brinell hardness (HBW) | ≤ 187 | – | Solution-annealed condition |
| Rockwell hardness (HRB) | ≤ 90 | – | Solution-annealed condition |
| Vickers hardness (HV) | ≤ 200 | – | Solution-annealed condition |
| Bend test (bend diameter = 2a) | No cracks after 180° bending | – | a = specimen thickness, for thickness ≤ 25 mm, solution annealed |
06Cr18Ni11Nb Stainless Steel Plate/Coil per GB/T 4237 Exact Equivalent Material Standards & Recommended Substitution Grades
| Country/Region | Standard | Grade Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240 / ASME SA240 | 347 (UNS S34700) | Niobium-stabilized, identical corrosion resistance class |
| EU | EN 10088-2 / EN 10028-7 | X6CrNiNb18-10 (1.4550) | Annealed, equivalent hot-rolled plate/coil |
| Japan | JIS G4304 | SUS347 | Hot-rolled stainless steel plate, matching composition |
| International | ISO 15510 | X6CrNiNb18-10 | General-purpose stainless steel plate |
| Germany (historical) | DIN 17440 / SEW 400 | X6CrNiNb18 10 (1.4550) | Former German standard, identical to EN |
06Cr18Ni11Nb Stainless Steel Plate/Coil per GB/T 4237 Application Introduction
06Cr18Ni11Nb is a versatile stabilized stainless steel that excels in environments where intergranular corrosion from welding or elevated temperature exposure is a concern. Its ability to resist sensitization makes it a popular choice for welded fabrications that cannot be solution annealed after fabrication. The material maintains high strength and oxidation resistance up to about 800°C, and it is widely used across chemical, petrochemical, and energy sectors.
Product Applications: Hot-rolled stainless steel plates and coils, Welded pipe and tube, Fittings and flanges, Heat exchanger shells and tube sheets, Storage tanks and process vessels, Furnace parts and radiant tubes, Expansion bellows, Reactor internals
Processed into products: Tube sheets and baffles in shell-and-tube heat exchangers, Pressure vessel shells and heads welded from plate, Welded piping systems for high-temperature corrosive fluids, Catalyst support grids in reformers, Burner tips and combustion chambers, Nuclear steam generator tubing (when qualified), Food processing mixing bowls and conveyor parts
Application industries: Chemical processing, Petrochemical and oil refining, Power generation (conventional and nuclear), Food and beverage processing, Pharmaceutical equipment, Desalination plants, Pressure vessel manufacturing, Heat exchanger and boiler production
06Cr18Ni11Nb Stainless Steel Plate/Coil per GB/T 4237 Similar / Alternative Materials for Comparison
| Country/Region | Standard | Grade | Notes on Similarity |
|---|---|---|---|
| China | GB/T 4237 | 06Cr18Ni11Ti (0Cr18Ni11Ti / 321) | Titanium-stabilized instead of niobium; similar mechanical and corrosion properties, better for temperatures <400°C where both perform equally, but 06Cr18Ni11Nb is preferred for applications involving polycrystalline sensitization or welding without post-weld heat treatment in thick sections. |
| USA | ASTM A240 | 321 (UNS S32100) | Titanium-stabilized version of 304; slightly lower high-temperature strength compared to 347 |
| USA | ASTM A240 | 304L (UNS S30403) | Low-carbon unstabilized grade; less suitable for service above 425°C but offers good general corrosion resistance and weldability at lower cost |
Notes:
For applications requiring enhanced resistance to intergranular attack after extended exposure in the 425-815°C range, a stabilizing heat treatment may be considered even after welding. The niobium content is normally controlled to Nb/(C+N) ≥ 8× to ensure full stabilization. When ordering, it is recommended to specify applicable standards (e.g., GB/T 4237), surface finish, and any supplementary requirements such as impact testing or non-destructive examination.
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