UNS S31254 pipe supplier. Contact us to get free quote and sample!
S31254 is a high alloy, high performance super austenitic stainless steel designed for extreme corrosive environments, especially chloride-containing environments. S321 is a standard titanium stabilized austenitic stainless steel, the main purpose of which is to improve the intergranular corrosion resistance of the standard 304 type in the sensitizing temperature range, suitable for moderately corrosive environments. They belong to completely different performance levels and price ranges.
Stainless steel 254smo and stainless steel 321 supplier
With 15 years of export excellence, HT PIPE is your reliable stockist and exporter. Our portfolio includes pipes, astm 5510 321 ss steel plate, astm a240 uns s31254 plate,round bars, and a wide array of fittings, flanges, and welding accessories. Contact us today for no-obligation pricing and product details-we're ready to support your projects.
uns s31254 vs s32100 material Chemical Composition
The S31254 alloy design focuses on ultra-high molybdenum, high chromium and nickel, nitrogen additions, copper additions, and ultra-low carbon, specifically targeting the most demanding corrosive environments. The S321 design focuses on titanium stabilization, primarily addressing the intergranular corrosion issues that can occur with standard 304 alloys after welding or high-temperature service.
| 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
S31254 has significantly higher strength, which may allow for thinner wall thicknesses in pipe design (calculation required), but also results in a higher tendency to work hardening, making cold working more difficult. The mechanical properties of S321 are closer to conventional 304.
| 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% |
s31254 steel vs s32100 welding
The welding process for S321 is relatively simple and offers greater tolerances. Welding S31254 requires more specialized processes, stricter parameter control (low heat input, low temperature), and expensive matching high-alloy welding consumables, resulting in significantly higher welding costs and technical requirements. However, its post-weld corrosion resistance (both in the weld and HAZ) far exceeds that of S321 in harsh environments.
