Difference Between S31254 and S32100 Material plate
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What is S31254 material plate?
S31254 material plate is a super austenitic stainless steel also known as 254 SMO (UNS S31254), characterized by high levels of molybdenum (6%) and nitrogen, which gives it excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. This high-strength, ductile material is commonly used in harsh, high-chloride environments such as seawater handling, desalination plants, pulp & paper bleach systems, and offshore oil & gas equipment.
What is UNS S32100 Material plate?
UNS S32100 is the Universal Numbering System designation for Alloy 321, a titanium-stabilized austenitic stainless steel known for its excellent resistance to intergranular corrosion and high-temperature strength. A "material plate" refers to a flat, sheet-like form of this alloy, used in high-temperature applications like engine manifolds, afterburners, and expansion joints due to its excellent oxidation and creep resistance up to 900°C (1652°F).
uns s31254 vs s32100 material Chemical Composition
| Element | S31254 | S321 |
|---|---|---|
| Cr | 19.5-20.5 | 17.0-19.0 |
| Ni | 17.5-18.5 | 9.0-12.0 |
| Mo | 6.0-6.5 | ≤0.50 |
| Ti | - | ≥5×C% |
| N | 0.18-0.22 | ≤0.10 |
| C | ≤0.020 | ≤0.08 |
s321 vs 254smo Corrosion Resistance
S31254 surpasses S321 in nearly all corrosion performance indicators (particularly pitting, crevice corrosion, chloride ion resistance, and SCC). S321's primary value lies in its resistance to intergranular corrosion after welding or high-temperature exposure. This advantage over 304 in certain operating conditions (non-high-chloride environments) does not compensate for its fundamental weakness in chloride-containing environments.
| Property | S31254 | S321 |
|---|---|---|
| Pitting/Crevice Corrosion (Cl⁻) | Excellent (Resists seawater/high-Cl⁻) | Poor (Avoid chloride environments) |
| Intergranular Corrosion | Excellent (Ultra-low C prevents sensitization) | Excellent (Ti stabilization prevents sensitization) |
| Stress Corrosion Cracking (SCC) | Good (Resists Cl⁻ SCC below 60°C) | Poor (High risk in Cl⁻ >60°C) |
| General Corrosion | Outstanding (Resists strong acids/reducing media) | Moderate (Suitable for oxidizing media only) |
stainless steel 1.4547 vs 1.4541 Mechanical & Physical Properties
| Property | S31254 | S321 |
|---|---|---|
| Yield Strength (MPa) | ≥300 | ≥205 |
| Tensile Strength (MPa) | ≥650 | ≥515 |
| Work Hardening Rate | High | Moderate |
|
Density (g/cm³) |
8.0 | 8.0 |
| Elongation | 35% |
35% |
Which is better for high-temperature applications: S31254 or S32100 stainless steel?
For high-temperature applications, S32100 (321 stainless steel) is generally better than S31254 (254SMO) because it is titanium-stabilized, offering excellent resistance to intergranular corrosion and maintaining strength at temperatures up to about 870 °C, while S31254 is optimized for corrosion resistance in chloride-rich environments and is usually limited to around 600 °C in continuous service.
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Click here to get UNS S32154 stainless steel plate stock list
