DIN 17400 1.4462 Duplex Stainless Steel Pipe
DIN 17400 1.4462 Duplex Stainless Steel Pipe – Corrosion-Resistant & High-Strength Alloy
Comprehensive material data for DIN 17400 1.4462 duplex stainless steel pipe, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Hot forming, cold forming, machining, welding (common processes include TIG, MIG, SAW)
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DIN 17400 1.4462 Duplex Stainless Steel Pipe Introduction
1.4462 (X2CrNiMoN22-5-3) is a duplex stainless steel with a mixed microstructure of austenite and ferrite, designed to offer high strength and excellent resistance to stress corrosion cracking, pitting, and crevice corrosion. It combines the benefits of austenitic and ferritic grades, providing good weldability and toughness even at low temperatures. Typically supplied in the solution-annealed condition, this grade is widely used in aggressive environments such as those found in the chemical, oil & gas, and marine industries. The dual-phase structure gives it roughly twice the yield strength of standard austenitic stainless steels. Its low carbon content improves intergranular corrosion resistance after welding. This material is a cost-effective alternative for many applications requiring superior corrosion resistance and mechanical robustness.
DIN 17400 1.4462 Duplex Stainless Steel Pipe Chemical Composition
The chemical composition of 1.4462 is balanced to achieve approximately 50% ferrite and 50% austenite. Controlled additions of chromium, molybdenum, and nitrogen provide high pitting resistance equivalent (PREN) typically above 34. Low carbon content improves weldability and intergranular corrosion resistance. All values are maximum unless a range is specified.
| Element | Standard Value (wt.%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.03 | |
| Silicon (Si) | ≤1.00 | |
| Manganese (Mn) | ≤2.00 | |
| Phosphorus (P) | ≤0.035 | |
| Sulfur (S) | ≤0.015 | |
| Chromium (Cr) | 21.0 – 23.0 | Key for corrosion resistance |
| Nickel (Ni) | 4.5 – 6.5 | Stabilizes austenite |
| Molybdenum (Mo) | 2.5 – 3.5 | Improves pitting resistance |
| Nitrogen (N) | 0.10 – 0.22 | Increases strength and pitting resistance |
DIN 17400 1.4462 Duplex Stainless Steel Pipe Thermal and Electrical Physical Properties
Physical properties at room temperature and elevated temperatures are presented. The values are typical for 1.4462 in the solution-annealed condition. Thermal expansion is similar to carbon steels, facilitating the design of composite structures. Thermal conductivity is lower than that of carbon steel but higher than many austenitic stainless steels.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.8 | g/cm³ | 20°C |
| Elastic Modulus (E) | 200 | GPa | 20°C |
| Shear Modulus (G) | 78 | GPa | 20°C |
| Poisson Ratio (ν) | 0.3 | - | 20°C |
| Thermal Expansion Coefficient (α) | 13.0 | 10⁻⁶/K | 20 – 100°C |
| Thermal Expansion Coefficient (α) | 13.5 | 10⁻⁶/K | 20 – 200°C |
| Thermal Expansion Coefficient (α) | 14.0 | 10⁻⁶/K | 20 – 300°C |
| Thermal Conductivity (λ) | 15 | W/(m·K) | 20°C |
| Thermal Conductivity (λ) | 16 | W/(m·K) | 100°C |
| Thermal Conductivity (λ) | 18 | W/(m·K) | 200°C |
| Thermal Conductivity (λ) | 20 | W/(m·K) | 300°C |
| Specific Heat Capacity (c) | 500 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρe) | 0.80 | μΩ·m | 20°C |
DIN 17400 1.4462 Duplex Stainless Steel Pipe Mechanical Properties at Room Temperature
Mechanical properties are in accordance with EN 10088-2 and relevant pipe standards (e.g., EN 10216-5, EN 10217-7). Values represent minimum requirements for longitudinal test pieces, unless otherwise stated. The duplex microstructure provides high yield strength, typically twice that of standard austenitic grades like 304L.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| 0.2% Yield Strength (Rp0.2) | ≥ 450 | MPa | Transverse(especially for pipes),wall thickness ≤75 mm |
| Tensile Strength (Rm) | 680 – 880 | MPa | Transverse, wall thickness ≤75 mm |
| Elongation (A) | ≥ 25 | % | Longitudinal, gauge length 5.65√S0 |
| Bend Test (Mandrel Diameter) | ≥ 1t | mm | t = wall thickness, bending angle 180° |
| Impact Energy (KV) | ≥ 100 | J | Longitudinal, at +20°C (V-notch) |
| Hardness (HB) | ≤ 270 | HBW | As per EN ISO 6506-1 |
DIN 17400 1.4462 Duplex Stainless Steel Pipe Complete Equivalent Materials – Standards and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10088-1 | X2CrNiMoN22-5-3 (1.4462) | Direct equivalent |
| USA | ASTM A240 / A790 | UNS S31803 / S32205 | S32205 has tighter nitrogen range; both are commercially 2205 |
| China | GB/T 20878 | 022Cr22Ni5Mo3N (S22253) | Chinese designation for 2205 duplex |
| Japan | JIS G4304 | SUS 329J3L | Similar duplex grade |
| International | ISO 15510 | X2CrNiMoN22-5-3 | Identical to EN designation |
DIN 17400 1.4462 Duplex Stainless Steel Pipe Application Introduction
1.4462 duplex stainless steel pipe is ideal for demanding applications that require high mechanical strength combined with excellent corrosion resistance, particularly in chloride-containing environments. It provides a long service life and low maintenance costs, often allowing for thinner wall sections compared to austenitic steels due to higher strength. Common applications span offshore, chemical processing, and marine industries.
Product Applications: Welded and seamless pipes for corrosive media, Heat exchangers and condensers, Structural components for offshore platforms, Tubular heat treatment systems, Seawater cooling and firewater piping
Processed into products: Pipe spools and fittings, Flanges, valves, and pump casings, Tubular heat exchanger tubes, Umbilical tubes for subsea controls, Agitator shafts and piping in chemical reactors, Brine heaters and evaporator tubes in desalination
Application industries: Oil & Gas (offshore platforms, subsea equipment, flowlines), Chemical Processing (pressure vessels, reactors, storage tanks), Desalination Plants (evaporators, brine pipes), Pulp & Paper (digesters, bleach lines), Marine Engineering (propeller shafts, seawater piping), Pollution Control (flue gas desulfurization units)
DIN 17400 1.4462 Duplex Stainless Steel Pipe Similar / Near-Equivalent Alternative Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10088-1 | 1.4410 (X2CrNiMoN25-7-4) | Super duplex with higher Mo and N, higher strength and PREN >40 |
| Europe | EN 10088-1 | 1.4460 (X3CrNiMoN27-5-2) | Higher chromium content, slightly lower pitting resistance |
| USA | ASTM A240 | UNS S32304 (2304) | Lean duplex with lower Ni and Mo, more cost effective for less aggressive environments |
| Europe | EN 10088-1 | 1.4362 (X2CrNi23-4) | Lean duplex, comparable to 2304 |
Notes:
When specifying 1.4462 pipes, ensure compliance with the relevant product standard (e.g., EN 10216-5 for seamless, EN 10217-7 for welded). The corrosion resistance depends on proper heat treatment; avoid exposure to temperatures between 300°C and 1000°C to prevent embrittlement due to sigma phase formation. Welding procedures must be qualified, and filler metals of matching composition (e.g., 22.9.3 NL) are recommended.
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