SUS XM27 Ferritic Stainless Steel Plate/Coil
SUS XM27 Ferritic Stainless Steel Plate/Coil - High Cr-Mo Corrosion Resistant Alloy
SUS XM27 is a super ferritic stainless steel with 26% Cr and 1% Mo providing superior corrosion resistance to chloride stress corrosion cracking and pitting. Ideal for heat exchangers and chemical processing equipment.
Welding, Forming, Bending, Machining (in annealed condition)
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SUS XM27 Ferritic Stainless Steel Plate/Coil Introduction
SUS XM27 is a low carbon, nitrogen controlled, nickel-free ferritic stainless steel containing approximately 26% chromium and 1% molybdenum. It offers excellent resistance to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion, especially in chloride-bearing aqueous environments. The alloy exhibits good weldability and formability in the annealed condition, with a fully ferritic microstructure that avoids intergranular corrosion issues common in austenitic grades. Supplied as hot-rolled or cold-rolled plates and coils, it is widely used in heat exchangers, condensers, and chemical processing equipment where high corrosion resistance at moderate temperatures is required.
SUS XM27 Ferritic Stainless Steel Plate/Coil Chemical Composition
The chemical composition of SUS XM27 is strictly controlled to achieve a stable ferritic microstructure and high corrosion resistance. Key characteristics include extremely low carbon and nitrogen for improved intergranular corrosion resistance, chromium for passivity, and molybdenum for pitting resistance.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.010 | Max |
| Silicon (Si) | ≤ 0.40 | Max |
| Manganese (Mn) | ≤ 0.40 | Max |
| Phosphorus (P) | ≤ 0.030 | Max |
| Sulfur (S) | ≤ 0.020 | Max |
| Chromium (Cr) | 25.00 – 27.50 | - |
| Molybdenum (Mo) | 0.75 – 1.50 | - |
| Nickel (Ni) | ≤ 0.50 | Residual element, Max |
| Copper (Cu) | ≤ 0.20 | Max |
| Nitrogen (N) | ≤ 0.015 | Max |
| Others | Nb or Ti not required | Stabilization not needed due to low (C+N) |
SUS XM27 Ferritic Stainless Steel Plate/Coil Thermal and Electrical Physical Properties
Thermophysical and electrical properties of SUS XM27 at ambient temperature unless otherwise stated. These values are typical for annealed material and may differ based on actual processing conditions. Density and thermal conductivity are key for heat exchanger design.
| Property Item | Standard Requirement / Typical Value | Unit | Test Conditions |
|---|---|---|---|
| Density (ρ) | 7.70 | g/cm³ | At 20 °C |
| Elastic Modulus (E) | 200 | GPa | At 20 °C |
| Shear Modulus (G) | 77 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.28 | - | Room temperature |
| Mean Thermal Expansion Coefficient (α) | 10.4 | 10⁻⁶/K | 20 – 100 °C |
| Mean Thermal Expansion Coefficient (α) | 10.8 | 10⁻⁶/K | 20 – 300 °C |
| Mean Thermal Expansion Coefficient (α) | 11.2 | 10⁻⁶/K | 20 – 500 °C |
| Thermal Conductivity (λ) | 21.0 | W/(m·K) | At 100 °C |
| Thermal Conductivity (λ) | 23.0 | W/(m·K) | At 300 °C |
| Thermal Conductivity (λ) | 25.0 | W/(m·K) | At 500 °C |
| Specific Heat Capacity (c_p) | 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | 0.64 | µΩ·m | At 20 °C |
SUS XM27 Ferritic Stainless Steel Plate/Coil Mechanical Properties
The following mechanical properties are typical for annealed SUS XM27 plate in thicknesses up to 8 mm, tested at room temperature according to JIS G4304. Note: Properties may vary with product form and heat treatment. No impact test is specified for this ferritic grade.
| Property Item | Standard Requirement | Unit | Test Conditions |
|---|---|---|---|
| Yield Strength (Rp0.2) | ≥ 275 | MPa | Room temperature, tensile test, thickness ≤8 mm |
| Tensile Strength (Rm) | ≥ 450 | MPa | Room temperature, tensile test |
| Elongation (A) | ≥ 20 | % | Gauge length 50 mm, thickness ≤8 mm |
| Bend Test (Bend angle) | 180° | - | Bend diameter = 1 times thickness (for plates <3 mm) |
| Hardness (HV) | ≤ 200 | HV | As annealed |
| Hardness (HBW) | ≤ 219 | HBW | As annealed |
SUS XM27 Ferritic Stainless Steel Plate/Coil Equivalent Material Standards and Substitution Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240/A240M | S44627 (UNS S44627) | Identical composition and properties |
| Europe | EN 10088-2 | 1.4592 (X2CrNiMo27-1) | Similar high Cr-Mo ferritic grade; check exact composition limits |
| International | ISO 15510 | X2CrMo27-1 | Equivalent designation |
SUS XM27 Ferritic Stainless Steel Plate/Coil Application Introduction
SUS XM27 excels in environments where chloride stress corrosion cracking (SCC) is a concern and where conventional austenitic stainless steels (e.g., 304/316) fail. Typical applications include:
Product Applications: Shell and tube heat exchangers, Condenser tubing and tube sheets, Reaction vessels and storage tanks, Piping systems for corrosive fluids, Evaporators and crystallizers
Processed into products: Heat exchanger tubes and baffles, Condenser plates, Welded pipe sections, Formed tank heads, Gasketed plate heat exchanger plates
Application industries: Chemical and petrochemical processing, Desalination and water treatment, Power generation (condensers, feedwater heaters), Food and beverage processing, Pharmaceutical equipment, Flue gas desulfurization (FGD) systems
SUS XM27 Ferritic Stainless Steel Plate/Coil Similar / Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304 | SUS 447J1 | 29Cr-4Mo, higher Mo for extreme pitting resistance; more costly |
| USA | ASTM A240 | S44660 (Sea-Cure®) | 26Cr-3Mo, higher Mo content; used in seawater applications |
| USA | ASTM A240 | S44635 (25Cr-4Mo-4Ni) | Duplex or super ferritic, better strength but lower thermal conductivity |
| Japan | JIS G4304 | SUS 444 | 19Cr-2Mo, lower Cr; economical alternative for less aggressive chloride environments |
| Japan | JIS G4304 | SUS 304 | Austenitic; more susceptible to SCC, but widely available and higher ductility |
Notes:
Welding: SUS XM27 can be welded using matching filler metal or slightly over-alloyed nickel-base consumables to maintain corrosion resistance and ductility. Post-weld annealing is recommended for critical applications. Heat treatment: Annealing at 900–1050 °C followed by rapid cooling (air or water) is typical. Limitations: Not recommended for use above 350 °C due to potential 475 °C embrittlement. Avoid prolonged exposure in the 315–540 °C range.
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