022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237
022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237: Properties & Equivalents
Comprehensive material data for 022Cr22Ni5Mo3N austenitic‑ferritic stainless steel plate/coil according to GB/T 4237, including chemistry, mechanical, and physical properties.
Hot rolling, cold rolling, welding, forming, machining (with appropriate tools)
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022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237 Introduction
022Cr22Ni5Mo3N is a low‑carbon duplex stainless steel with approximately 22% chromium, 5% nickel, 3% molybdenum, and nitrogen addition. It is classified as an austenitic‑ferritic (duplex) grade under GB/T 4237. The balanced microstructure provides a combination of high strength, excellent corrosion resistance (especially to pitting and crevice corrosion in chloride environments), and good weldability. Typical delivery condition is solution annealed and pickled. The steel is widely used in aggressive environments such as chemical processing, oil and gas, and marine engineering.
022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237 Chemical Composition
The chemical composition conforms to GB/T 4237 for grade 022Cr22Ni5Mo3N. Controlled carbon level ensures intergranular corrosion resistance. Chromium, molybdenum, and nitrogen enhance pitting resistance (PREN >34). Phosphorus and sulfur are kept low to maintain hot workability and toughness.
| Element | Standard Value (wt.%) | Remarks |
|---|---|---|
| C | ≤ 0.030 | Max |
| Si | ≤ 1.00 | Max |
| Mn | ≤ 2.00 | Max |
| P | ≤ 0.030 | Max |
| S | ≤ 0.020 | Max |
| Cr | 22.0 – 23.0 | Range |
| Ni | 4.5 – 6.5 | Range |
| Mo | 3.0 – 3.5 | Range |
| N | 0.14 – 0.20 | Range |
| Fe | Balance | — |
022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237 Physical Properties
Physical properties are typical for 022Cr22Ni5Mo3N duplex stainless steel in solution‑annealed condition. Values are influenced by temperature and are provided as design guidance. The duplex structure yields a thermal expansion coefficient between that of austenitic and ferritic steels.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.80 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 200 | GPa | 20 °C |
| Shear Modulus (G) | 77 | GPa | 20 °C |
| Poisson Ratio (ν) | 0.3 | — | 20 °C |
| Thermal Expansion Coefficient (α) | 13.0 | 10⁻⁶/K | 20 – 100 °C |
| Thermal Conductivity (λ) | 19 | W/(m·K) | 20 °C |
| Specific Heat Capacity | 500 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρ_e) | 0.80 | µΩ·m | 20 °C |
022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237 Mechanical Properties
Mechanical properties are determined on solution‑annealed samples according to GB/T 4237. The values apply to thicknesses ≤ 75 mm. The high strength combined with good elongation makes the steel suitable for load‑bearing structures in corrosive service.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (Rp0.2) | ≥ 450 | MPa | Room temperature, solution annealed, thickness ≤ 75 mm |
| Tensile Strength (Rm) | ≥ 620 | MPa | Room temperature, solution annealed, thickness ≤ 75 mm |
| Elongation (A) | ≥ 25 | % | Gauge length 50 mm, room temperature, thickness ≤ 75 mm |
| Hardness | ≤ 290 | HBW | Solution annealed condition |
022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237 Exact Equivalent Standards & Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 4237 | 022Cr22Ni5Mo3N | Original designation |
| USA | ASTM A240 / A240M | UNS S32205 | Direct equivalent for 22Cr‑5Ni‑3Mo‑N |
| EU | EN 10088‑2 / EN 10028‑7 | X2CrNiMoN22‑5‑3 (1.4462) | Fully equivalent duplex grade |
| Japan | JIS G4304 / G4305 | SUS329J3L | Similar duplex stainless steel |
| International | ISO 15510 | X2CrNiMoN22‑5‑3 | Harmonized designation |
022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237 Application Introduction
022Cr22Ni5Mo3N excels in aggressive environments where pitting, crevice corrosion, and stress corrosion cracking are concerns. Its high strength allows thinner sections, reducing weight and cost. Typical applications include:
Product Applications: Pressure vessels and storage tanks, Piping systems (seamless and welded pipes), Flanges, fittings, and valves, Structural components in marine environments, Plate for heat exchangers (tube sheets, baffles)
Processed into products: Pump shafts and impellers, Valve bodies and seats, Heat exchanger tubes and plates, Propeller shafts and rudder components, Fasteners (bolts, nuts) for corrosive service, Expansion bellows
Application industries: Chemical and petrochemical processing, Oil & gas (onshore and offshore), Marine engineering and shipbuilding, Pulp and paper industry, Desalination plants, Heat exchangers and boilers, Power generation (flue gas desulfurization)
022Cr22Ni5Mo3N Duplex Stainless Steel Plate per GB/T 4237 Closely Related / Similar Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240 | UNS S31803 | Earlier duplex 2205 with slightly lower Cr/Mo/N, still widely acceptable |
| EU | EN 10088‑2 | X2CrNiMoN21‑5‑3 (1.4410) | Super‑duplex with higher strength, not exact substitute |
Notes:
Delivery condition is solution annealed (1020–1100 °C, water quenched) and descaled. The steel should not be used at temperatures above 300 °C for prolonged times due to possible embrittlement. Welding procedures must be qualified for duplex steels, typically using filler metals matching or over‑alloyed for corrosion resistance.
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