Austenitic XM-15 (S38100) Stainless Steel Plate/Coil
Austenitic XM-15 (S38100) Stainless Steel Plate/Coil: High Silicon Grade for Oxidation Resistance
XM-15 is an austenitic chromium-nickel stainless steel with high silicon content for improved oxidation resistance at elevated temperatures, widely used in automotive exhaust systems and heat exchangers.
Hot rolling, cold rolling, solution annealing, pickling, slitting, cutting
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Austenitic XM-15 Stainless Steel Plate/Coil Introduction
XM-15 (UNS S38100) is an austenitic stainless steel defined in ASTM A240. It features elevated silicon content (1.50–2.50%) compared to standard 304, enhancing oxidation resistance under cyclic and continuous high-temperature exposure up to approx. 925°C (1700°F). The alloy offers good corrosion resistance comparable to Type 304, excellent formability, and weldability. Its austenitic structure provides ductility and toughness from cryogenic to elevated temperatures. Typically supplied as plate or coil in solution-annealed condition.
Austenitic XM-15 Stainless Steel Plate/Coil Chemical Composition
The following table lists the chemical requirements for XM-15 (S38100) as per ASTM A240/A240M. The high silicon is key for oxidation resistance. Elements not listed are not intentionally added; maximum values apply unless indicated as range.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | |
| Manganese (Mn) | ≤ 2.00 | |
| Phosphorus (P) | ≤ 0.030 | |
| Sulfur (S) | ≤ 0.030 | |
| Silicon (Si) | 1.50 – 2.50 | |
| Chromium (Cr) | 17.0 – 19.0 | |
| Nickel (Ni) | 17.5 – 18.5 | |
| Nitrogen (N) | — | Not specified |
| Iron (Fe) | Balance |
Austenitic XM-15 Stainless Steel Plate/Coil Thermal and Electrical Physical Properties
Typical physical properties for XM-15 (S38100) in the annealed condition. These values are representative for general engineering calculations and may vary slightly depending on processing conditions. Data sourced from published literature and manufacturer datasheets.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 8.03 | g/cm³ | 20°C (68°F) |
| Melting Range | 1370 – 1400 | °C | Approximate |
| Elastic Modulus (E) | 200 | GPa | Tension, 20°C |
| Shear Modulus (G) | 77 | GPa | Calculated from E and Poisson ratio |
| Poisson's Ratio (ν) | 0.30 | — | At 20°C |
| Coefficient of Thermal Expansion (α) | 16.3 | µm/(m·°C) | 20 – 100°C |
| Thermal Conductivity (λ) | 14.0 | W/(m·K) | 20°C |
| Specific Heat Capacity (c) | 500 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρe) | 0.72 | µΩ·m | 20°C |
Austenitic XM-15 Stainless Steel Plate/Coil Mechanical Properties
Minimum mechanical properties for plate, sheet, and strip in solution-annealed condition at room temperature, as specified in ASTM A240/A240M. Values depend on thickness; the table reflects common requirements for product thickness ≤ 187.5 mm (7.38 in.) unless otherwise noted. Typical hardness values are also provided.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 515 | MPa | Room temperature, solution annealed |
| Tensile Strength (Rm) | ≥ 75 | ksi | Room temperature, solution annealed |
| Yield Strength (Rp0.2) | ≥ 205 | MPa | Room temperature, 0.2% offset |
| Yield Strength (Rp0.2) | ≥ 30 | ksi | Room temperature, 0.2% offset |
| Elongation (A50) | ≥ 40 | % | Gauge length 50 mm, thickness ≤ 187.5 mm |
| Elongation (A2") | ≥ 40 | % | Gauge length 2 in., thickness ≤ 7.38 in. |
| Hardness, Rockwell B | ≤ 92 | HRB | Solution annealed |
| Hardness, Brinell | ≤ 201 | HBW | Solution annealed |
Austenitic XM-15 Stainless Steel Plate/Coil Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade/Designation | Remarks |
|---|
Austenitic XM-15 Stainless Steel Plate/Coil Application Introduction
XM-15 (S38100) is primarily employed where exposure to high temperatures and moderate corrosive environments demands better oxidation resistance than standard 304. Its high silicon content forms a stable, adherent oxide layer, reducing scale spallation under thermal cycling. Typical applications include automotive exhaust components, industrial heat exchangers, and furnace hardware. The grade can be formed, bent, deep drawn, and welded using standard austenitic stainless steel practices.
Product Applications: Exhaust manifolds, Mufflers and catalytic converter shells, Heat exchanger plates and tubes, Annealing boxes and furnace retorts, High-temperature ducting and chimneys
Processed into products: Formed sheet metal parts, Welded assemblies, Deep-drawn components, Stamped brackets and flanges, Tube sheets and baffles
Application industries: Automotive, Petrochemical, Power Generation, Industrial Heating Equipment, Chemical Processing
Austenitic XM-15 Stainless Steel Plate/Coil Similar/Comparable Alternative Materials
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| Europe | EN 10095 / EN 10088-1 | 1.4828 (X15CrNiSi20-12) | Heat-resisting steel; higher Cr (19-21) and Ni (11-13), C ≤0.20. Suitable for high-temperature oxidation resistance. |
| USA | ASTM A240/A240M | 304 (S30400) / 304L (S30403) | Standard austenitic stainless; lower Si (≤1.00); lower oxidation resistance but better weldability; widely available. |
| Japan | JIS G4304/G4305 | SUS304 / SUS304L | JIS equivalent to 304 series; similar mechanical properties but lower Si. |
| International | ISO 15510 | X5CrNi18-10 (1.4301) | Standard stainless with lower Si; not heat-resisting. |
Notes:
Corrosion Resistance: XM-15 exhibits general corrosion resistance similar to Type 304 in most environments. It is not recommended for severe acidic or high-chloride applications where pitting may occur.
Weldability: The grade is readily weldable by GTAW, GMAW, SMAW; use low heat input and filler metal ER308 or matching composition (ER381).
Heat Treatment: Solution annealing at 1038–1121°C (1900–2050°F) followed by rapid quench.
Availability: Commonly supplied as cold-rolled sheet, hot-rolled plate, and coil in various thicknesses and widths.
Note: No exact international equivalent grade exists; the closest are heat-resisting steels with higher nickel and chromium.
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