Stainless steel for highly corrosive environments

Supra

The Supra range contains stainless steel products designed for highly corrosive environments. Our Supra range stainless steels have a good resistance to uniform corrosion in many organic and inorganic chemicals.

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Outokumpu Supra grades

Supra 316/4401

Supra 316/4401 is an austenitic stainless steel that belongs to the standard CrNiMo stainless steels. Due to their molybdenum content, the austenitic CrNiMo standard grades can be used in applications with increased demand for corrosion resistance. Their well-balanced material properties make them suitable for the fabrication of many products. Supra 316/4401 is commonly available from many stainless steel stockists in many product forms and dimensions. It can be supplied with a wide range of functional and aesthetic surface finishes.

Typical applications
  • Equipment in the chemical and petrochemical industry
  • Pulp and paper industry equipment
  • Textile industry equipment
  • Food and beverage industry equipment
  • Pharmaceutical industry equipment
  • Medical applications
  • Flanges and valves
Product forms
Chemical composition

Supra 316L/4404

Supra 316L/4404 is our most widely used molybdenum-alloyed austenitic stainless steel. Supra 316L/4404 is a low-carbon stainless steel and is used in various process industries and other aggressive environments with higher than average corrosion resistance requirements. Due to its low carbon content, this product is also weldable in thicknesses of more than 5–6 mm/ 0.19–0.23 in without sensitivity to intergranular corrosion.

Supra 316L/4404 is an austenitic stainless steel that belongs to the standard CrNiMo stainless steels. Grade Supra 316L/4404 has low carbon content for improved resistance against intergranular corrosion after welding.

Due to their molybdenum content, the austenitic CrNiMo standard grades can be used in applications with increased demand for corrosion resistance. Their well-balanced material properties make them suitable for the fabrication of many products.

Supra 316L/4404 is commonly available from many stainless steel stockists in many product forms and dimensions. It can be supplied with a wide range of functional and aesthetic surface finishes.

Typical applications
  • Equipment in the chemical and petrochemical industry
  • Pulp and paper industry equipment
  • Textile industry equipment
  • Food and beverage industry equipment
  • Pharmaceutical industry equipment
  • Medical applications
  • Flanges and valves
Product forms
Chemical composition

Supra 316plus®

With its high chromium and nitrogen content Supra 316plus™ delivers high corrosion resistance, high strength, good formability, and excellent weldability, making it ideal for use in a variety of applications, including heat exchangers, water treatment, and piping, as well as in architectural applications such as indoor and outdoor facades.

Supra 316plus™ is an austenitic Cr-Ni-Mo stainless steel with 21 wt.-% chromium and relatively low nickel and molybdenum content. Due to its high nitrogen content, it has increased mechanical strength and shows a high degree of work hardening on mechanical deformation. Due to its high chromium and nitrogen content, Supra 316plus™ offers similar or better corrosion resistance than austenitic Cr-Ni-Mo standard grades in many corrosive environments.

Supra 316plus™ is used in applications where increased corrosion resistance and a combination of high mechanical strength and good formability is needed. Due to its tendency to work hardening, Supra 316plus can absorb an increased amount of energy during deformation. It can be delivered in the temper rolled condition with different strength levels.

Typical applications
  • Process and transport tanks
  • Water treatment and pipes
  • Heat exchangers
  • Architectural applications
  • Food and beverage industry
  • Pulp and paper industry
  • Mining industry
  • Tank containers
Product forms
Chemical composition

Supra 316/4436

Supra 316/4436 is a Supra 316L/4432 alternative with higher carbon content and similar corrosion resistance. Supra 316/4436 is an austenitic stainless steel that belongs to the standard CrNiMo stainless steel family. Supra 316/4436 has the variant with increased molybdenum content for slightly improved corrosion resistance.

Due to their molybdenum content, the austenitic CrNiMo standard grades can be used in applications that demand increased corrosion resistance. Their well-balanced material properties make them suitable for the fabrication of many products.

Supra 316/4436 is available in many product forms and dimensions. It can be supplied with a wide range of functional and aesthetic surface finishes.

Typical applications
  • Pulp and paper industry equipment
  • Pharmaceutical industry equipment
  • Flanges and valves
Product forms
Chemical composition

Supra 316L/4435

Supra 316L/4435 is a Supra 316L/4432 alternative with higher chromium and nickel content for enhanced corrosion resistance and formability. Supra 316L/4435 is an austenitic stainless steel that belongs to the standard CrNiMo stainless steel family. Supra 316L/4435 has low carbon content for improved resistance against intergranular corrosion after welding, increased nickel content for improved formability, and increased molybdenum content for slightly improved corrosion resistance.

Due to their molybdenum content, the austenitic CrNiMo standard grades can be used in applications with increased demand for corrosion resistance. Their well-balanced material properties make them suitable for the fabrication of many products.

Supra 316L/4435 is available in many product forms and dimensions. It can be supplied with a wide range of functional and aesthetic surface finishes.

Typical applications
  • Urea plants
  • Pulp and synthetic fiber plants
  • Flanges and valves
Product forms
Chemical composition

Supra 316Ti/4571

Supra 316Ti/4571 is a titanium-stabilized, molybdenum-alloyed austenitic alternative to Supra 316L/4404 – mainly used for elevated temperature applications. Due to its titanium-stabilization this product is weldable in all thickness ranges without becoming susceptible to intergranular corrosion. It belongs to the standard CrNiMo stainless steel family.

Due to their molybdenum content, the austenitic CrNiMo standard grades can be used in applications with increased demand for corrosion resistance. Their well-balanced material properties make them suitable for the fabrication of many products. Due to its titanium content, Supra 316Ti/4571 can also be used at elevated temperatures.

Supra 316Ti/4571 is commonly available from many stainless steel stockists in many product forms and dimensions. Due to its titanium alloying, polishing options for Supra 316Ti/4571 are limited.

Typical applications
  • Flue gas applications
  • Flanges and valves
Product forms
Chemical composition

Supra 444/4521

Supra 444/4521 is a nickel-free, molybdenum alloyed ferritic stainless steel with very good corrosion resistance, good cold formability, and high strength. Supra 444/4521 allows for thinner walls in tanks and is not prone to stress-corrosion cracking.

Supra 444/4521 is a 2% molybdenum-alloyed ferritic stainless steel with medium chromium that can be used in many corrosive environments. As a ferritic stainless steel, it has high resistance to chloride-induced stress corrosion cracking. Because of its titanium alloying, Supra 444/4521 can be welded in all dimensions without becoming susceptible to intergranular corrosion.

Typical applications
  • Hot water tanks
  • Drinking water pipes
Product forms
Chemical composition

Circle Green Supra 316/4401

Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.

Typical applications
Product forms
Chemical composition

Circle Green Supra 316L/4404

Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.

Circle Green Supra 316L/4404 is our most widely used molybdenum-alloyed austenitic stainless steel. Circle Green Supra 316L/4404 is a low-carbon stainless steel and is used in various process industries and other aggressive environments with higher than average corrosion resistance requirements. Due to its low carbon content, this product is also weldable in thicknesses of more than 5–6 mm/ 0.19–0.23 in without sensitivity to intergranular corrosion.

Circle Green Supra 316L/4404 is an austenitic stainless steel that belongs to the standard CrNiMo stainless steels. Grade Circle Green Supra 316L/4404 has low carbon content for improved resistance against intergranular corrosion after welding.

Due to their molybdenum content, the austenitic CrNiMo standard grades can be used in applications with increased demand for corrosion resistance. Their well-balanced material properties make them suitable for the fabrication of many products.

Circle Green Supra 316L/4404 is commonly available from many stainless steel stockists in many product forms and dimensions. It can be supplied with a wide range of functional and aesthetic surface finishes.

Typical applications
  • Equipment in the chemical and petrochemical industry
  • Pulp and paper industry equipment
  • Textile industry equipment
  • Food and beverage industry equipment
  • Pharmaceutical industry equipment
  • Medical applications
  • Flanges and valves
Product forms
Chemical composition

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For Highly Corrosive Environments

Supra

The Supra range contains austenitic and ferritic stainless steels grades for medium to highly corrosive environments in PRE range 22 – 26.

The most widely used molybdenum alloyed austenitic stainless grade, Supra 316L/4404 (EN 1.4404) , defines the overall landscape of the Supra range. The Supra range is complemented by a modern stabilized molybdenum alloyed nickel-free 18% chromium ferritic stainless steel alternative, Supra 444/4521 (EN 1.4521).

The latest Supra range addition is the austenitic Supra 316plus/4420 (EN 1.4420). Thanks to higher chromium and nitrogen, Supra 316plus has higher corrosion resistance and strength compared to 316L. 

Supra range Cr-Ni-Mo austenitic stainless steels have excellent corrosion resistance, welding and forming, especially stretch-forming characteristics. Austenitic steels exhibit very high ductility also down to cryogenic temperatures. Due to the higher toughness and work hardening nature of austenitic stainless steels, special attention may be needed during forming and machining compared to ferritic stainless or carbon steels.

Modern Supra range stabilized molybdenum alloyed ferritic stainless steel, Supra 444/4521, has excellent corrosion resistance, welding and deep-drawing properties. Nickel-free ferritic stainless steels grades have excellent resistances to chloride-induced stress-corrosion cracking. Ferritics have good heat transfer properties that can be utilized in applications where uniform and fast heat transfer is preferred. Good heat transfer with lower thermal expansion eases weldability via smaller weld distortion and buckling behavior than austenitics. In addition, ferritics have similar machinability as carbon streels, due to low work hardening characteristics.  

Supra range grades can be used in a wide range of applications supported with a broad selection of surface finishes from mills and service centers.

Standards and approvals for Supra range

EN ISO 18286     Hot-rolled stainless steel plates – Tolerances on dimensions and shape  
EN 10051 Hot-rolled steel strip.
EN 10088-1 Stainless steels – list of stainless steels 
ISO 15510 Stainless steels – chemical composition 
EN ISO 9445 Cold-rolled stainless narrow strip, wide strip, plate/sheet and cut lengths. 
ASTM A 480 General requirements for flat-rolled stainless and heat resisting steel 
ASTM A 959 Harmonized standard grade compositions for wrought stainless steels 
ASME IID Materials – Physical properties tables 


 EN 10028-7   Flat products for pressure purposes – Stainless steels
 EN 10088-2  Stainless steels – sheet/plate and strip for general purposes
 EN 10088-3  Stainless steels – semi-finished products, bars, rods sections for general purposes
 EN 10088-4  Technical delivery conditions for sheet/plate and strip
 EN 10088-5  Technical delivery conditions for bars, rods wire, sections and bright products of corrosion resisting steels for construction purposes
 EN 10095  Heat resisting steels and nickel alloys
 EN 10151  Stainless steel strip for springs
 EN 10302  Creep resisting steels, nickel and cobalt alloys
 ASTM A 167  Stainless and heat-resisting Cr-Ni steel plate, sheet, and strip
 ASTM A 176  Stainless and heat-resisting Cr steel plate, sheet, and strip
 ASTM A 240  Cr and Cr-Ni stainless steel plate, sheet and strip for pressure vessels
 ASTM A276  Stainless steel and heat resisting steel bars and shapes
 ASTM A479/479M  Stainless steel bars for boilers/pressure vessels
 ASTM A493  Stainless steel and heat-resisting steel rod and wire for cold heading and forging
 ASTM A555  General requirements for stainless and heat resistant steel wire and wire rod
 ASTM A 666  Austenitic stainless steel sheet, strip, plate, bar for structural and architectural applications
 ASME IIA  Materials. Part A – Ferrous Material Specifications
      

Outokumpu meets the most common certifications and approvals around the world, including:

  • AD 2000 Merkblatt
  • Approval of Material Manufacturers
  • Factory Production Control Certificate
  • ISO 9001
  • ISO 14001
  • ISO 50001
  • ISO/TS 16949
  • NORSOK
  • OHSAS 18001

Outokumpu Supra range downloads

Outokumpu Supra range datasheet
Machining guidelines for standard austenitic stainless steel grades
Outokumpu 4622 and 316plus brochure
Outokumpu Product Ranges chart