Duplex and super duplex stainless steel: S31803 / 2205, S32750, S32760, SUS329J4L, Ferralium 255 and 254 SMO. Strong, chloride-resistant grades cut to size with no MOQ.
Duplex stainless steels combine high strength with excellent resistance to chloride pitting and stress corrosion cracking. E STEEL SDN BHD supplies standard duplex S31803 / 2205, super duplex S32750 and S32760, SUS329J4L, Ferralium 255 and 254 SMO.
Each grade below lists its composition, mechanical properties and typical applications.
2205 Duplex Stainless Steel, 1.4462, S31803, F51, S32205
Duplex Stainless Steel S31803 (UNS S31803) is a ferritic-austenitic alloy combining high strength, excellent corrosion resistance, and cost efficiency. Its dual-phase microstructure makes it ideal for harsh environments like oil & gas, chemical processing, and marine applications.
| Element | S31803 Composition |
|---|---|
| Chromium (Cr) | 21–23% |
| Nickel (Ni) | 4.5–6.5% |
| Molybdenum (Mo) | 2.5–3.5% |
| Nitrogen (N) | 0.08–0.20% |
| Manganese (Mn) | ≤2.0% |
Key Insight: Balanced Cr, Mo, and N ensure resistance to pitting, stress corrosion, and chloride attack.
| Property | S31803 (Annealed) |
|---|---|
| Tensile Strength | 620–795 MPa |
| Yield Strength | 450–550 MPa |
| Elongation (%) | 25 |
| Hardness (HB) | 290–320 |
| Impact Toughness | 100+ J at -40°C |
| Standard | Equivalent Grade |
|---|---|
| UNS | S31803 |
| EN (EU) | 1.4462 (X2CrNiMoN22-5-3) |
| JIS (Japan) | – |
| GB (China) | 022Cr22Ni5Mo3N |
| ISO | X2CrNiMoN22-5-3 |
S31803’s blend of strength and corrosion resistance makes it ideal for:
| Grade | PREN* | Yield Strength (MPa) | Key Advantage |
|---|---|---|---|
| S31803 | 34–37 | 450–550 | Cost-effective, balanced properties |
| S32205 | 35–40 | 450–550 | Higher corrosion resistance |
| S32750 | ≥40 | 550–650 | Superior strength & chloride resistance |
Pitting Resistance Equivalent Number (PREN) = %Cr + 3.3(%Mo) + 16(%N)
The corrosion rate of 2205 was 0.416 MPY (milli-inch per year), whereas 316L exhibited 0.647 MPY. When 2205 was coupled to 316L with equal surface area ratio, the corrosion rate of 2205 reduced to 0.260 MPY, indicating that 316L stainless steel behaved like a sacrificial anode.
Super Duplex Stainless Steel S32750, UNS S32750, 1.4410, A182 F53
E STEEL SDN BHD is a leading supplier of Super Duplex S32750, offering no minimum order quantity (MOQ) and rapid air freight delivery worldwide. Our precision bandsaw cutting ensures ±1.0mm accuracy, tailored to urgent project demands in oil & gas, marine, and chemical sectors.
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 24–26 |
| Nickel (Ni) | 6–8 |
| Molybdenum (Mo) | 3–4 |
| Nitrogen (N) | 0.24–0.32 |
| Manganese (Mn) | ≤1.2 |
| Iron (Fe) | Balance |
| Property | Value |
|---|---|
| Tensile Strength | 750–1,000 MPa |
| Yield Strength | 550 MPa |
| Elongation | 25% |
| Hardness (Brinell) | 290 HB |
| Impact Toughness | 100 J (-46°C) |
| Property | S32750 | Duplex 2205 |
|---|---|---|
| Tensile Strength | 750–1,000 MPa | 620–750 MPa |
| Pitting Resistance (PREN) | ≥40 | ≥35 |
| Chloride Resistance | Superior | Moderate |
| Cost | Higher | Lower |
The chemical composition of S32750 and S32760 are similar; however, the latter contains slightly more copper and tungsten. The copper content (min. 0.5, max 1.0) permits excellent resistance to corrosion in many nonoxidizing and mineral acids like hydrochloric and sulfuric acid.
Super duplex stainless steel (SDSS) is a candidate material for production tubing in oil and gas wells and subsea pipelines used to transport corrosive hydrocarbon fluids. The suitability of this material for high temperature applications is examined in this paper.
Super Duplex Stainless Steel S32760, Zeron 100, A182 F55, A182 F53, 1.4501
E STEEL SDN BHD is a premier global supplier of Super Duplex S32760 (Zeron 100), offering no minimum order quantity (MOQ) and air freight delivery in 5–7 days. Our precision bandsaw cutting (±0.5mm) ensures custom-fit solutions for high-stress applications in oil & gas, marine, and chemical sectors.
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 24–26 |
| Nickel (Ni) | 6–8 |
| Molybdenum (Mo) | 3–4 |
| Tungsten (W) | 0.5–1.0 |
| Nitrogen (N) | 0.20–0.30 |
| Copper (Cu) | 0.5–1.0 |
| Iron (Fe) | Balance |
| Property | Value |
|---|---|
| Tensile Strength | 750–1,000 MPa |
| Yield Strength | 550 MPa |
| Elongation | 25% |
| Hardness (Brinell) | 290 HB |
| Impact Toughness | 100 J (-50°C) |
| Property | S32760 (Zeron 100) | Duplex 2205 |
|---|---|---|
| Tensile Strength | 750–1,000 MPa | 620–750 MPa |
| Pitting Resistance (PREN) | ≥40 | ≥35 |
| Chloride Resistance | Superior | Moderate |
| Cost | Higher | Lower |
The chemical composition of S32750 and S32760 are similar; however, the latter contains slightly more copper and tungsten. The copper content (min. 0.5, max 1.0) permits excellent resistance to corrosion in many nonoxidizing and mineral acids like hydrochloric and sulfuric acid.
Super Duplex Steel UNS S32750 Bar, 2507 Round Rods, ASTM B276 Stainless Steel Super Duplex Steel Bars, Hot & Cold Rolled Super Duplex Stainless Steel S32750 Round Bar, UNS S32750 Hexagonal Bar Suppliers in Malaysia
SUS329J4L, S329J4L, S31260, S32506 Duplex Stainless Steel
A duplex stainless steel having resistance to chloride-ion corrosion. It has excellent resistance to pitting corrosion and stress-corrosion cracking in hot seawater
| Element | Cr | Ni | Mo | Mn | C | N | Fe |
|---|---|---|---|---|---|---|---|
| % Range | 22-24 | 4.5-6.5 | 2.5-3.5 | ≤2.0 | ≤0.03 | 0.08-0.20 | Balance |
| Property | Tensile Strength | Yield Strength | Elongation | Hardness (HB) | Impact (J) |
|---|---|---|---|---|---|
| Value | 620-820 MPa | ≥450 MPa | ≥25% | ≤290 | ≥100 |
| Grade | PREN | Yield Strength (MPa) | Cost Efficiency |
|---|---|---|---|
| SUS329J4L | ~35 | ≥450 | Moderate |
| 316L | ~26 | ≥170 | Low |
| 2205 | ~35 | ≥450 | Moderate |
| 2507 | ~42 | ≥550 | High |
High temperature strength is similar to SUS 430 in the range of 950~1150℃. However the steel shows rapid increase in the strength below 900℃. Regarding cold workability, care is required as proof stress is high and elongation is low in comparison with SUS 304
Various welding methods are applicable in the same manner as with the standard austenitic stainless steels, including shielded metal arc welding, TIG welding, and plasma welding. Same duplex grade type welding consumable should be used.
A mixture of nitric acid and fluoric acid is used in pickling. However, because descaling is somewhat difficult in comparison with SS304, alkali immersion before acid pickling, and if possible, shot blasting are extremely effective.
Ferralium 255 – 1.4507,UNS S32550, F61, Super Duplex 255
Ferralium® 255 – super duplex 4507 is a super duplex stainless steel supplied in the hot worked and annealed condition. It achieves higher strengths than most stainless steels and alternative corrosion resistant alloys, offering the potential to reduce section size and therefore weight and cost.
As a 25% Cr alloy, with significant additions of copper, Ferralium® 255 offers excellent corrosion resistance in a wide variety of corrosive chemicals including sulphuric, nitric and phosphoric acid. In seawater and other chloride containing environments it also provides outstanding resistance to pitting and crevice corrosion, with Critical Pitting Temperature exceeding 50°C. Excellent ductility and impact strength at both ambient and sub-zero temperatures combine with a high resistance to abrasion, erosion and cavitation erosion.
Listed in NACE MR 01 75 for sour service and having gained ASME Approval for Pressure Vessel applications, Ferralium® 255-SD50 is tested to the highest degree using tests designed to guarantee that the trade-marked product possesses high integrity, a correct phase balance and the absence of sigma and other deleterious phases.
| Element | Cr | Ni | Mo | N | Cu | Fe |
|---|---|---|---|---|---|---|
| % Range | 24-27 | 4.5-6.5 | 2.9-3.9 | 0.10-0.25 | 1.5-2.5 | Balance |
| Property | Tensile Strength | Yield Strength | Elongation | Hardness (HB) | Impact (J) |
|---|---|---|---|---|---|
| Value | 750-895 MPa | ≥550 MPa | ≥25% | ≤290 | ≥100 |
| elongation | Alloy 316SS | Alloy 2205 | Ferralium Alloy 255 |
|---|---|---|---|
| 40 | 25 | 15 |
| Wear Resistance | Alloy 316SS | Alloy 2205 | Ferralium Alloy 255 |
|---|---|---|---|
| Hardness | RB80 | RC21 | RC28 |
| Critical Pitting Temperature | Alloy 316SS | Alloy 2205 | Ferralium Alloy 255 |
|---|---|---|---|
| Degree C ASTM G48-Method A | 0 | 20 | 40 |
| Temperature | Alloy 316SS | Alloy 2205 | Ferralium Alloy 255 |
|---|---|---|---|
| 50 °C | 60 | 370 | No Pitting |
| 60 °C | No Test | No Test | 110 |
| 60 °C | No Test | No Test | 170 |
| Critical Crevice Temperature | Alloy 316SS | Alloy 2205 | Ferralium Alloy 255 |
|---|---|---|---|
| Degree C ASTM G48-Method B (10% FE CL 6H 0) | -2.5 | 17.5 | 22.5 |
| C Ring Stress Cracking | Alloy 316SS | Alloy 2205 | Ferralium Alloy 255 |
|---|---|---|---|
| 80 Degree C Stressed to 100% Yield Strength, H2S 0.125 Bar, Sour Brine with 46,000 MG/L Chloride | Cracks | Fine Cracks | No Cracks |
| Resistance to Localized Corrosion | Alloy 316SS | Alloy 2205 | Ferralium Alloy 255 |
|---|---|---|---|
| PREN No. CR + 3.3(MO) + 16(N) | 23.6 | 34.5 | 40 |
| Corrosion Rates MPY | Alloy 316SS | Alloy 2205 | Ferralium Alloy 255 |
|---|---|---|---|
| 10% Sulfuric Boiling | 855 | 206 | 40 |
| 65% Nitric Boiling | 11 | 21 | 5 |
| Is Stronger Than Most Competitive Alloys | ||||
|---|---|---|---|---|
| Alloy | UNS | Typical Tensile (Ksi) | Typical Yeild (Ksi) | Typical Elongation (%) |
| Alloy 255 | S32550 | 126 | 98 | 30 |
| SUS316L | S31603 | 81 | 42 | 50 |
| NiCu400 | N04400 | 78 | 31 | 50 |
| 20Cb-3 | N08020 | 92 | 47 | 39 |
| 2205 Duplex | S31803 | 112 | 75 | 32 |
FERRALIUM 255 is a cost effective alternative to materials such as the nickel alloys, 20 type alloys, brass and bronze. Marine environments have long been the domain of admiralty bronze. Alloy 255 is replacing admiralty bronze, and the nickel alloys, in offshore platforms, deck hardware, rudders and shafting.
Alloy 255 is also making inroads in “borderline” corrosion applications where the nickel alloys and high performance alloys have been used but may not have been absolutely necessary. In some instances, it has even been used to replace high performance Ni-Cr-Mo-F-Cu alloys in the phosphoric acid industry.
Valves, pumps, shafts, marine environments, Applications in down-hole, waste water, polycarbonate production, and demineralized water production.
| Grade | PREN* | Yield Strength (MPa) | Corrosion Resistance | Cost Efficiency |
|---|---|---|---|---|
| Ferralium 255 | ~40 | ≥550 | Excellent in chlorides | High |
| 2205 | ~35 | ≥450 | Good | Moderate |
| 316L | ~26 | ≥170 | Moderate | Low |
*PREN = Pitting Resistance Equivalent Number (Cr + 3.3Mo + 16N).
Duplex stainless steels are based around a composition of 22% chromium, whereas super duplex stainless steels are based around a composition of 25% chromium. By increasing the chromium content, the level of pitting corrosion resistance is also increased.
Stainless steel grade 254 SMO™, UNS S31254, 1.4547, 6MO, F44
Stainless steel grade 254 SMO™, UNS S31254, 1.4547, 6MO, F44
Stainless steel 254SMO ( UNS S31254 ) is a very high end austenitic stainless steel. It is designed with a combination of impact toughness resistance to chloride stress corrosion cracking, and pitting and crevice corrosion with strength that is twice that of the stainless steel 300 series.
For certain applications, stainless steel 254SMO ( 1.4547 ) has been reported to be a cost-effective substitute for high nickel and titanium alloys. It is known to possess excellent workability as well.
| Element | Cr | Ni | Mo | Cu | N | Fe |
|---|---|---|---|---|---|---|
| % Range | 19.5-20.5 | 17.5-18.5 | 6.0-6.5 | 0.5-1.0 | 0.18-0.25 | Balance |
| Property | Tensile Strength | Yield Strength | Elongation | Hardness (HB) |
|---|---|---|---|---|
| Value | 650-850 MPa | ≥300 MPa | ≥35% | ≤223 |
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20-100°C/68-212°F) | 16.5 µm/m°C | 9.17 µin/in°F |
| Thermal conductivity | 14 W/mK | 97.2 BTU in/hr.ft².°F |
| Grade | PREN | Yield Strength (MPa) | Cost Efficiency |
|---|---|---|---|
| S31254 | ~43 | ≥300 | High (long-term) |
| 316L | ~26 | ≥170 | Low |
| Duplex 2205 | ~35 | ≥450 | Moderate |
| AL-6XN | ~45 | ≥350 | High |
254 SMO stainless steel is quite tough to machine due to the extremely high work hardening rate and lack of sulfur content; however using sharp tools, overpowered machine tools, positive feeds, good amount of lubrication, and slow speeds tend to provide good machining results.
Welding of stainless steel type 254 SMO requires filler material without which it results in poor strength properties. Filler metals such as AWS A5.14 ERNiCrMo-3, and alloy 625 are recommended. Electrodes used in the process, have to match with AWS A5.11 ENiCrMo-12.
Annealing of this material should be performed at 1149-1204°C (2100-2200°F), which should be followed by a water quench.
Forging, upsetting and other operations relating to this material can be performed at 982 – 1149°C (1800 – 2100°F). It is recommended that temperatures do not exceed this range as it would result in scaling and reduction in the workability of the material. To re-attain maximum corrosion resistant properties, it is advisable to perform post-process annealing.
Cold working can be carried out using all the traditional methods; however the process would be tough due to its high work hardening rate. The result will provide the material with increased strength and toughness.
Stainless steel grade 254 SMO™ does not respond to heat treatment. Hardening is possible only through cold reduction.
Stainless steel grade 254 SMO™ is used in the following areas:
Bandsaw technology ensures minimal kerf loss and clean, burr-free edges.
Cut to the size your job needs. No minimum order quantity.
Mill test reports (MTRs) for traceability.
Fast air and sea shipping with real-time tracking.
Yes – its higher strength and chloride resistance make it superior for seawater applications.
S31803 is weakly magnetic due to its ferritic phase.
3–5 business days for most orders.
Typically 5–7 business days post-order confirmation.
Yes! We provide precision-cut plates, bars, pipes, and fittings.
Yes, but use filler metals like ER2594 and control heat input to avoid embrittlement.
5–7 business days after order confirmation.
Yes, but use ER2594 filler metal and controlled heat input to prevent sigma phase formation.
Yes! All orders include ASTM/EN-compliant Mill Test Reports (MTRs).
Yes, it maintains toughness down to -50°C (-58°F).
No MOQ, shipped globally from Malaysia. Send us the size and we will cut it.
