09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237
09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237 - High Nitrogen Austenitic Alloy
Comprehensive material data for 09Cr17Ni5Mo3N stainless steel according to GB/T 4237, including chemical composition, mechanical properties, thermal and electrical physical properties, equivalent grades, and application guidance.
Welding, cutting, bending, forming, solution annealing
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09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237 Introduction
09Cr17Ni5Mo3N is a high nitrogen austenitic stainless steel specified in GB/T 4237 for hot rolled steel plates, sheets and strips. It provides an excellent combination of high strength and superior corrosion resistance in chloride containing environments.
- The elevated nitrogen content enhances yield and tensile strength without sacrificing ductility, achieving Rp0.2 ≥ 295 MPa and Rm ≥ 690 MPa in solution annealed condition.
- Chromium (16.5–18.5%) and molybdenum (2.5–3.2%) ensure resistance to pitting and crevice corrosion, while controlled nickel (4.5–5.5%) provides austenitic structure stability.
- Low carbon content minimizes intergranular corrosion after welding.
Used extensively in marine, chemical processing and offshore engineering where high mechanical stress and aggressive media coexist.
09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237 Chemical Composition per GB/T 4237
The chemical composition is determined by cast analysis. The steel is characterized by controlled chromium, nickel and molybdenum, plus a deliberate addition of nitrogen to boost strength.
- Carbon ≤ 0.09% prevents carbide precipitation during welding.
- Nitrogen 0.07–0.12% acts as a solid solution strengthener and improves pitting corrosion resistance.
- Molybdenum 2.50–3.20% enhances resistance to localized corrosion.
Low phosphorus and sulfur ensure good hot workability.
| Element | Standard Value % | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.09 | Low carbon for weldability |
| Silicon (Si) | ≤ 1.00 | Deoxidizer |
| Manganese (Mn) | ≤ 1.00 | Austenite former |
| Phosphorus (P) | ≤ 0.040 | Impurity control |
| Sulfur (S) | ≤ 0.030 | Impurity control |
| Chromium (Cr) | 16.50 – 18.50 | Ferrite stabilizer, corrosion resistance |
| Nickel (Ni) | 4.50 – 5.50 | Austenite stabilizer |
| Molybdenum (Mo) | 2.50 – 3.20 | Pitting resistance |
| Nitrogen (N) | 0.07 – 0.12 | Strength and corrosion enhancer |
09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237 Physical Properties
The physical properties are typical for nitrogen-strengthened austenitic stainless steels. Values are influenced by the exact microstructure but provide practical guidance for engineering calculations.
- Density and elastic modulus are similar to conventional 304/316 but with improved strength.
- Thermal expansion and conductivity affect welding and service in temperature gradients.
Data based on general references for this grade family; not standardized in GB/T 4237.
| Property | Typical Value | Unit | Measurement Conditions |
|---|---|---|---|
| Density (ρ) | 7.80 | g/cm³ | 20 °C |
| Elastic modulus (E) | 200 | GPa | Tension, room temperature |
| Shear modulus (G) | 77 | GPa | Calculated |
| Poisson's ratio (ν) | 0.30 | – | Room temperature |
| Mean thermal expansion coefficient (α) | 16.5 | 10⁻⁶/°C | 20–100 °C |
| Thermal conductivity (λ) | 15.0 | W/(m·K) | 100 °C |
| Specific heat capacity | 500 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρ_e) | 0.75 | Ω·mm²/m | 20 °C |
09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237 Mechanical Properties – Solution Annealed Condition per GB/T 4237
The mechanical properties are verified on test pieces taken transversely from the delivered plate. The material exhibits a high yield strength due to nitrogen alloying while maintaining excellent ductility.
- For thickness up to 13.5 mm, Rp0.2 ≥ 295 MPa, Rm ≥ 690 MPa and elongation ≥ 30%.
- Guaranteed hardness limits ensure machinability and formability.
Properties may vary with thickness; consult the standard for specific thickness ranges.
| Property | Guaranteed Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (Rp0.2) | ≥ 295 | MPa | Room temperature, transverse |
| Tensile strength (Rm) | ≥ 690 | MPa | Room temperature, transverse |
| Elongation after fracture (A) | ≥ 30 | % | Gauge length 50 mm, thickness ≤ 13.5 mm |
| Brinell hardness | ≤ 262 | HBW | As solution annealed |
| Rockwell hardness | ≤ 104 | HRB | As solution annealed |
09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237 Exact Equivalent Grades – Same Chemical and Property Requirements
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 4237 | 09Cr17Ni5Mo3N | The definition grade; no overseas standard replicates it exactly. |
| International | ISO 15510 | X2CrNiMoN22-5-3 ? | Not an exact match – 22-5-3 refers to a duplex grade. |
09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237 Application Introduction
09Cr17Ni5Mo3N stainless steel is ideal for demanding environments where high mechanical strength and resistance to chloride‑induced corrosion are simultaneously required. Its high nitrogen content permits significant weight savings over conventional austenitic grades while maintaining formability.
- Effective in marine atmospheres, brackish water and chemical plants handling oxidizing acids.
- Excellent for welded structures because the low carbon and nitrogen suppress sensitization.
- Solution annealing after heavy cold work restores optimum corrosion resistance.
Product Applications: Chemical storage tanks and pressure vessels, Heat exchangers and condensers, Seawater piping systems, Offshore structural platforms and walkways, High-strength fasteners and springs, Pump casings and valve bodies
Processed into products: Flanges, gaskets, bolting, Impellers and shafts for centrifugal pumps, Welded stator and rotor components in motors exposed to corrosive gases, Instrument tubing in aggressive environments, Structural brackets and supports in marine constructions, Expansion joints and bellows
Application industries: Chemical and petrochemical processing, Marine engineering and shipbuilding, Offshore oil & gas platforms, Desalination plants, Pulp and paper industry, Power generation (condenser tubing, pump shafts)
09Cr17Ni5Mo3N Stainless Steel Plate/Coil per GB/T 4237 Similar/Alternative Grades with Proximate Composition and Performance
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240 / A240M | UNS S20910 (Nitronic 50) | Higher chromium (20.5–23.5) and nickel (11.5–13.5), comparable nitrogen & molybdenum; broad acceptance. |
| Europe | EN 10088-2 | 1.4563 (X2CrNiMoN22-5-3) | Duplex grade with higher Cr and lower Ni, may substitute in some corrosive services after re‑qualification. |
| USA | ASTM A240 / A240M | UNS S21904 (Nitronic 40) | Lower molybdenum (≤0.75) and higher Mn (8–10), thus reduced pitting resistance but similar strength. |
| Japan | JIS G4304 | SUS329J4L (duplex) | Not identical; for reference when enhanced corrosion resistance is needed. Verify mechanical compatibility. |
Notes:
For stringent corrosion applications, pitting resistance equivalent (PRE) of 09Cr17Ni5Mo3N is typically around 30–35 (PRE = %Cr + 3.3 × %Mo + 16 × %N), making it suitable for mild-to-moderate chloride concentrations. Welding considerations: Use low heat input and avoid interpass temperature >150 °C. Filler metal matching the base composition is recommended (AWS ER209 or similar). Post weld heat treatment is generally not required for thickness ≤ 5 mm, but solution annealing at 1040–1120 °C followed by water quenching restores full properties.
- Actual surface finish and dimensional tolerances shall be agreed upon between purchaser and manufacturer per GB/T 4237.
- Material shall be supplied with test certificates per EN 10204 type 3.1 or equivalent.
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