XM-29 (S24000) Stainless Steel Plate & Coil
High-Strength Austenitic XM-29 (S24000) Stainless Steel Plate & Coil Datasheet
Complete technical profile of XM-29 (UNS S24000) stainless steel plate/coil: chemical composition, mechanical properties, physical constants, equivalent grades, and application guidance.
Hot rolling, cold rolling, annealing, pickling, cutting, forming, welding (low heat input recommended)
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XM-29 Stainless Steel Plate & Coil Introduction
XM-29 (UNS S24000) is a high-manganese, nitrogen-strengthened austenitic stainless steel combining excellent strength with good corrosion resistance.
- Non-magnetic even after severe cold work
- High yield and tensile strength, roughly twice that of Type 304
- Excellent wear and galling resistance
- Superior cryogenic toughness and low magnetic permeability
- Resistant to chloride stress-corrosion cracking
It is typically supplied in the annealed or cold-worked condition as plate, sheet, and coil and is widely used for chemical processing, marine hardware, pump shafts, and valve components.
XM-29 Stainless Steel Plate & Coil Chemical Composition
The following limits are specified in ASTM A240 for UNS S24000 (XM-29) plate, sheet, and strip. Manganese and nitrogen are key alloying elements that replace a portion of nickel to stabilize the austenitic structure while raising strength.
- Phosphorus and sulfur are controlled to enhance weldability and hot workability.
- Nitrogen content must be tightly held to achieve the required mechanical properties and maintain the austenitic, non-magnetic structure.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Maximum |
| Manganese (Mn) | 11.50 – 14.50 | Broad range to stabilize austenite |
| Silicon (Si) | ≤ 1.00 | Maximum |
| Phosphorus (P) | ≤ 0.060 | Maximum |
| Sulfur (S) | ≤ 0.030 | Maximum |
| Chromium (Cr) | 17.00 – 19.00 | Primary corrosion resistance element |
| Nickel (Ni) | 2.25 – 3.75 | Low nickel, supplemented by Mn and N |
| Nitrogen (N) | 0.20 – 0.40 | Critical for strength and austenite stability |
XM-29 Stainless Steel Plate & Coil Thermal and Electrical Physical Properties
Typical physical data for annealed XM-29 (S24000) stainless steel. Values are influenced by composition and processing; they serve as engineering estimates. Multiple temperature ranges are shown for thermal expansion and thermal conductivity.
- Low magnetic permeability (< 1.02 at 200 Oe) is typical in the annealed condition and remains low after severe cold work.
- Density and elastic moduli are close to those of conventional austenitic grades.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.80 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 193 | GPa | 20 °C (tension) |
| Shear Modulus (G) | 76 | GPa | 20 °C (calculated) |
| Poisson's Ratio (ν) | 0.30 | – | 20 °C |
| Thermal Expansion (α) | 16.5 | µm/m·K | 20 – 100 °C |
| Thermal Expansion (α) | 17.5 | µm/m·K | 20 – 300 °C |
| Thermal Expansion (α) | 18.0 | µm/m·K | 20 – 500 °C |
| Thermal Conductivity (λ) | 14.0 | W/m·K | 100 °C |
| Thermal Conductivity (λ) | 16.0 | W/m·K | 300 °C |
| Thermal Conductivity (λ) | 19.0 | W/m·K | 500 °C |
| Specific Heat Capacity (Cp) | 500 | J/kg·K | 20 – 100 °C |
| Electrical Resistivity (ρe) | 0.72 | µΩ·m | 20 °C |
| Magnetic Permeability | < 1.02 | µ (at 200 Oe) | Annealed, 20 °C |
XM-29 Stainless Steel Plate & Coil Mechanical Properties
Room temperature tensile and hardness requirements per ASTM A240 for annealed XM-29 (S24000) plate, sheet, and strip. These are minimum or maximum specification values for material in the solution-annealed condition.
- Actual properties may be higher depending on cold work level.
- Bend test: 180° bend over a mandrel diameter equal to the specimen thickness (t) for thicknesses up to 9.5 mm; no cracking allowed on the outside of the bend.
| Property | Specification Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (Rp0.2) | ≥ 415 | MPa | 0.2% offset, room temperature |
| Tensile Strength (Rm) | ≥ 690 | MPa | Room temperature |
| Elongation (A50) | ≥ 30 | % | Gauge length 50 mm (2 in.) |
| Bend Test | 180°, no cracks | – | Bend diameter = t (≤ 9.5 mm thickness) |
| Hardness (HBW) | ≤ 241 | HBW | Brinell, 3000 kg load |
| Hardness (HRBW) | ≤ 100 | HRB | Rockwell B scale |
XM-29 Stainless Steel Plate & Coil Equivalent Standards and Replaceable Grade Designations
| Country/Region | Standard | Grade / Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240/A240M | XM-29 (UNS S24000) | Plate, sheet, strip |
| USA | ASTM A276/A276M | XM-29 (UNS S24000) | Bars and shapes |
| USA | ASTM A479/A479M | XM-29 (UNS S24000) | Bars for pressure vessel |
| USA | AMS 5658 | UNS S24000 | Bars, forgings, and rings (aerospace) |
| International | NACE MR0175/ISO 15156 | UNS S24000 | Approved for H₂S service (sour environments) within hardness limits |
XM-29 Stainless Steel Plate & Coil Application Introduction
XM-29 (S24000) stainless steel bridges the gap between standard 300-series austenitic grades and higher-alloyed specialty steels.
- Its high strength allows down-gauging and weight reduction in fabricated equipment.
- Excellent cryogenic properties and non-magnetic character make it suitable for specialized instrumentation and superconducting systems.
- The alloy can be machined, welded (with low heat input practices), and formed using common stainless steel techniques, though higher forces are required due to its strength.
Product Applications: Pump shafts and sleeves, Valve stems, seats, and trim, Marine propeller shafts, Non-magnetic housings and enclosures, Heat exchanger plates and tube sheets, Springs and high-strength fasteners, Cryogenic tank shells, Food processing blades and wear strips
Processed into products: Centrifugal pump impellers and wear rings, Control valve stems and plugs, Stud bolts and nuts for flanged connections (high strength), Compressor discs and shafts (non-magnetic requirement), Instrumentation tubing and fittings for hydrogen service, Waveguide components (non-magnetic, corrosion resistant), Aerospace hydraulic actuator parts
Application industries: Chemical and petrochemical processing (pumps, valves, heat exchangers), Marine engineering (shafts, propeller components, fasteners), Oil & gas (sour service equipment, non-magnetic drill collars), Cryogenics (storage vessels, transfer lines, superconducting magnet supports), Food and beverage (conveyor components, mixing blades), Power generation (nuclear and conventional, non-magnetic structural parts)
XM-29 Stainless Steel Plate & Coil Similar or Nearby Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240 | S20400 (XM-18, 201) | Lower strength, lower Ni, higher Mn, economical substitute for non-critical applications |
| USA | ASTM A240 | S21904 (XM-11, Nitronic 40) | Similar Mn-N strengthening, lower Cr (19-21.5), comparable strength, good wear resistance |
| USA | ASTM A240 | S20910 (XM-19, Nitronic 50) | Higher Ni (11.5-13.5) and Mo (1.5-3.0), superior corrosion resistance, higher strength, preferred for aggressive environments |
| USA | ASTM A240 | S21800 (Nitronic 60) | Higher Si (3.5-4.5) for exceptional galling resistance, lower strength than XM-29, used for wear surfaces |
Notes:
- Welding: Use AWS ER209 or ER312 filler metals; maintain interpass temperature below 150 °C to preserve properties. Post-weld annealing is normally not required.
- Corrosion: Comparable to Type 304 in many media, with better resistance to chloride SCC. Not suitable for strongly oxidizing acids or high-temperature H₂S above 60 °C (refer to NACE limits).
- Cold working: Rapid work hardening; achievable strengths can exceed 1000 MPa in heavily cold-worked conditions while retaining non-magnetic behavior.
- Certification: Material can be supplied with EN 10204 3.1 certification upon request.
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