Ultra 904L is a high-nickel and molybdenum austenitic stainless steel with very high corrosion resistance. It was originally developed for handling sulfuric acid at ambient temperatures, and is now used in a broad range of chemical industry applications.
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A 6 % molybdenum and nitrogen-alloyed austenitic stainless steel with extremely high resistance to both uniform and localized corrosion. This product was developed especially for oil and gas offshore platforms and the pulp and paper industry.
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Ultra 317L is a molybdenum-alloyed austenitic stainless steel with higher corrosion resistance than Supra 316L/4404 – mainly used in the USA and Asia.
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317L
Ultra 725LN is a type 310 material (high chrome and high nickel) that has been developed and optimized specifically for urea production, which demand extremely high corrosion resistance. It has similar general pitting resistance to Ultra 904L.
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Ultra 6XN is a 6 % molybdenum, high-nickel and nitrogen-alloyed austenitic product with extremely high resistance to both uniform and localized corrosion.
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Ultra 654 SMO is the most corrosion-resistant stainless steel in the world. A 7 % molybdenum, very high nitrogen alloyed austenitic product with high mechanical strength. A potentially lean alternative to traditional wet-corrosion resistant nickel-based alloys.
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Sanicro® 35 is the latest addition to the Outokumpu Ultra range bridging the gap between high performance stainless steel and conventional nickel base alloys. This new grade has excellent corrosion resistance in combination with high mechanical strength. Due to its leaner alloying concept Sanicro® 35 can be an attractive and cost competitive alternative to nickel base alloys with similar properties.
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Sanicro® is a trademark owned by Alleima AB
Product forms
Outokumpu Ultra Alloy 825 is a titanium stabilized austenitic nickel base alloy with an addition of copper.
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For Extremely Corrosive Environments
The Ultra range includes highly alloyed austenitic grades that are designed for extremely corrosive environments with PRE of more than 27.
The Ultra range includes our key products Ultra Alloy 825 (EN 2.4858), Ultra 904L (EN 1.4539) and Ultra 254 SMO (EN 1.4547) as well as several alternatives, for example Ultra 654 SMO (EN 1.4652) , the most corrosion-resistant stainless steel in the world, for your most specific applications.
The Ultra range is the best choice when you need material for extremely corrosive environments where standard grades like Core 304L/4307 or Supra 316L/4404 are not sufficient for the corrosion challenges of your application.
The Ultra range stainless steels are not just excellent in corrosion resistance, but the strength and elongation properties of the Ultra range are similar or better in comparison with conventional austenitic stainless steels. The addition of nitrogen to Ultra grades such as Ultra 254 SMO gives them higher yield and tensile strength. Despite the greater strength of these steels, they offer very good possibilities for cold as well as hot forming. Ultra range steels are well suited for welding, and the methods used for welding conventional austenitic steels can also be used on these products.
Typical applications for Ultra range grades are:
Ultra Alloy 825 is a Ti-stabilized austenitic nickel base alloy used in the oil and gas industry in piping systems, petroleum refinery equipment and sour gas service systems. Ultra 904L is used in petrochemical industry equipment such as pipes, heat exchangers, tanks, and reactor vessels. Ultra 254 SMO is for applications requiring resistance to chlorinated seawater, flue gas cleaning, maritime exhaust gas cleaning as well as bleaching equipment in the pulp and paper industry and flanges and valves.
Ultra range grades can be used in a wide range of applications supported with a broad selection of surface finishes from mills and service centers.
| EN 10028-7 | Flat products for pressure purposes – Stainless steels |
| EN 10088-2 | Stainless steels – Corrosion resisting sheet/ plate/strip for general and construction purposes |
| EN 10088-3 | Stainless steels – Corrosion resisting semi-finished products/bars/rods/wire/sections for general and construction purposes |
| EN 10088-4 | Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes |
| EN 10088-5 | Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resistant steels for construction purposes |
| EN 10272 | Stainless steel bars for pressure purposes |
| EN 10283 | Corrosion resistant steel castings |
| ASTM A 193 / ASME SA-193 | Alloy and stainless steel bolts and nuts for high pressure and high temperature service |
| ASTM A 240 / ASME SA-240 | Cr and Cr-Ni stainless steel plate/sheet/strip for pressure purposes |
| ASTM A 276 | Stainless and heat-resisting steel bars/shapes |
| ASTM A 312 / ASME SA-312 | Seamless and welded austenitic stainless steel pipe |
| ASTM A 351 / ASME SA-351 | Steel castings, austenitic, duplex for pressure containing parts |
| ASTM A 358 / ASME SA-358 | Electric fusion-welded austenitic Cr-Ni alloy steel pipe for high temperature |
| ASTM A 409 / ASME SA-409 | Welded large diameter austenitic pipe for corrosive or high-temperature service |
| ASTM A 473 | Stainless steel forgings for general use |
| ASTM A 479 / ASME SA-479 | Stainless steel bars for boilers and other pressure vessels |
| ASTM A 743 | Castings, Fe-Cr-Ni, corrosion resistant for general application |
| ASTM A 744 | Castings, Fe-Cr-Ni, corrosion resistant for severe service |
| ASTM B 649 / ASME SB-649 | Bar and wire |
The most commonly used international product standards are given in the table above. For a full list of standards by product, visit Steel Finder.
| NACE MR0175 | Sulfide stress cracking resistant material for oil field equipment |
| Norsok M-CR-630 | Material data sheets for 6Mo stainless steel |
| VdTÜV WB 473 | Austenitischer Stahl X 1 CrNiMoCuN 20 18 7 Werkstoff-Nr. 1.4547 |
| VdTÜV WB 537 | Stickstofflegierter austenitischer Stahl X2CrNiMnMoN 25-18-6-5 Werkstoff-Nr 1.4565 |
The most commonly used international product standards are given in the table above. For a full list of standards by product, see steelfinder.outokumpu.com
For the list of certificates and approvals by mill, see outokumpu.com/certificates
