06Cr17Ni12Mo2Nb Stainless Steel
06Cr17Ni12Mo2Nb Stainless Steel - Stabilized Austenitic Grade for Pressure Vessels & High-Temperature Service
Comprehensive technical data for 06Cr17Ni12Mo2Nb austenitic stainless steel according to GB/T 4237, including chemical composition, mechanical properties, physical properties, and international equivalents.
Hot rolling, cold rolling, solution annealing, welding, forming, machining
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06Cr17Ni12Mo2Nb Stainless Steel Introduction
06Cr17Ni12Mo2Nb is a niobium-stabilized austenitic stainless steel specified in GB/T 4237 for hot-rolled stainless steel plate, sheet and strip. It combines the excellent corrosion resistance of 316 with improved intergranular corrosion resistance after welding or high-temperature exposure due to niobium stabilization. The alloy offers good creep strength and is suitable for service up to approximately 800°C. Typical delivery condition is solution annealed. It is widely used in chemical, petrochemical, and pressure vessel industries where resistance to pitting and stress-corrosion cracking in chloride environments is required.
06Cr17Ni12Mo2Nb Stainless Steel Chemical Composition as per GB/T 4237
The chemical composition limits for 06Cr17Ni12Mo2Nb are specified to ensure austenitic structure, corrosion resistance, and stabilization against chromium carbide precipitation. Niobium (Nb) content is tied to carbon content to provide stabilization: Nb ≥ 10×C up to a maximum of 1.10%.
| Element | Specified Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | |
| Silicon (Si) | ≤ 1.00 | |
| Manganese (Mn) | ≤ 2.00 | |
| Phosphorus (P) | ≤ 0.035 | |
| Sulfur (S) | ≤ 0.015 | |
| Chromium (Cr) | 16.00 – 18.00 | |
| Nickel (Ni) | 10.00 – 14.00 | |
| Molybdenum (Mo) | 2.00 – 3.00 | |
| Niobium (Nb) | 10×C – 1.10 | Stabilization requirement |
06Cr17Ni12Mo2Nb Stainless Steel Thermal and Electrical Physical Properties
Physical properties of 06Cr17Ni12Mo2Nb are typical for 18Cr-12Ni-2.5Mo austenitic stainless steels. Data are provided at room temperature and elevated temperatures where available. Density: 8.0 g/cm³, Thermal conductivity ~15 W/m·K at 100°C, and Electrical resistivity ~0.75 μΩ·m.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 8.0 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 200 | GPa | 20°C |
| Modulus of Elasticity (E) | 185 | GPa | 200°C |
| Modulus of Elasticity (E) | 170 | GPa | 400°C |
| Modulus of Rigidity (G) | 77 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.30 | – | 20°C |
| Thermal Expansion Coefficient (α) | 16.5 | 10⁻⁶/K | 20–100°C |
| Thermal Expansion Coefficient (α) | 17.5 | 10⁻⁶/K | 20–200°C |
| Thermal Expansion Coefficient (α) | 18.5 | 10⁻⁶/K | 20–400°C |
| Thermal Conductivity (λ) | 15 | W/m·K | 20°C |
| Thermal Conductivity (λ) | 18 | W/m·K | 200°C |
| Thermal Conductivity (λ) | 21 | W/m·K | 400°C |
| Specific Heat Capacity | 500 | J/kg·K | 20°C |
| Electrical Resistivity (ρ_e) | 0.75 | μΩ·m | 20°C |
06Cr17Ni12Mo2Nb Stainless Steel Mechanical Properties
Mechanical properties according to GB/T 4237 for plate thickness ≤ 75 mm. Values are obtained by transverse testing. For thicknesses ≤ 3 mm, elongation may be slightly lower. Proof strength Rp0.2 ≥ 205 MPa, Tensile strength Rm ≥ 520 MPa, and Elongation A ≥ 40% for standard thicknesses.
| Property | Standard Requirement Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (Rp0.2) | ≥ 205 | MPa | Room temperature, plate thickness ≤ 75 mm |
| Tensile Strength (Rm) | 520 – 720 | MPa | Room temperature |
| Elongation (A) | ≥ 40 | % | Gauge length 50 mm, thickness ≤ 12.5 mm |
| Elongation (A) | ≥ 40 | % | Gauge length 5.65√S₀, thickness > 12.5 mm |
| Hardness (HBW) | ≤ 217 | HB | Solution annealed condition |
| Hardness (HRB) | ≤ 95 | HRB | Solution annealed condition |
| Hardness (HV) | ≤ 220 | HV | Solution annealed condition |
06Cr17Ni12Mo2Nb Stainless Steel Exact Equivalent Material Standards and Substitutable Grades
| Country / Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| China | GB/T 4237 | 06Cr17Ni12Mo2Nb | Original specification |
| International | ISO 4954 | X6CrNiMoNb17-12-2 | Chemical equivalent |
| European Union | EN 10088-2 | 1.4580 / X6CrNiMoNb17-12-2 | Full equivalence |
| USA | ASTM A240 | UNS S31640 (Type 316Nb) | Full equivalence; also 316Cb |
| Japan | JIS G4304 | SUS316Nb | Approximate; check stabilization |
06Cr17Ni12Mo2Nb Stainless Steel Application Introduction
06Cr17Ni12Mo2Nb is primarily selected for its ability to maintain corrosion resistance in welded conditions without post-weld heat treatment, owing to niobium stabilization. It also provides moderate high-temperature strength. Typical applications include equipment in the chemical, petrochemical, and power generation industries.
Product Applications: Process vessels and columns, Heat exchanger tubesheets and shells, Boiler drums and piping, Welded pipes and fittings, Flanges, valves, and pump components, High-temperature ducting and stacks
Processed into products: Tube sheets, Welded pressure vessel shells, Nozzle reinforcements, Expansion joints, Bolting (in stabilized grade), Impellers and shafts for corrosive media
Application industries: Chemical processing, Petrochemical and oil & gas, Power generation (boilers, heat exchangers), Pharmaceutical and food processing, Pulp and paper, Marine and offshore (moderate chloride environments), Pressure vessel manufacturing
06Cr17Ni12Mo2Nb Stainless Steel Similar / Near-Equivalent Alternative Materials
| Country / Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| China / EU | GB/T 4237 / EN 10088 | 06Cr17Ni12Mo2 (316, 1.4401) | Lower intergranular corrosion resistance; not stabilized |
| China / EU | GB/T 4237 / EN 10088 | 022Cr17Ni12Mo2 (316L, 1.4404) | Lower carbon but not stabilized; better after welding but lower high-temperature strength |
| China / EU | GB/T 4237 / EN 10088 | 06Cr17Ni12Mo2Ti (316Ti, 1.4571) | Titanium-stabilized variant; similar performance |
| China | GB/T 4237 | 06Cr19Ni13Mo3 (317) | Higher molybdenum; better pitting resistance but not stabilized |
Notes:
For service temperatures above 600°C, long-term exposure may cause sigma phase embrittlement; stabilized grade only prevents sensitization, not sigma. Selection of welding consumables should match or over-match molybdenum content. Post-weld cleaning and passivation are recommended for optimal corrosion resistance. Mechanical properties may vary for thicknesses outside the range of GB/T 4237; consult mill certificate.
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