Stainless steel for highly corrosive environments
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Our Supra range austenitics can be readily formed by all cold forming methods. These products are mainly used in facades, claddings, storage tanks, and heat exchangers.
All grades share common forming properties such as excellent stretch formability, a high work-hardening rate as well as an average strain ratio r of approximately 1. The stability of the austenite decreases with lower alloying element content; more martensite is formed during cold working. In addition to the chemical composition, the martensite transformation depends on the forming temperature.
Due to their high toughness and work hardening behavior, austenitic steels are more difficult to machine than carbon steels but are still comparatively easy to machine compared to more highly alloyed stainless-steel grades. They require higher cutting forces than carbon steels, show resistance to chip breaking, and have a high tendency to built-up edge formation. The best machining results are obtained by using high-power equipment, sharp tooling, and a rigid set-up.
Low interstitial levels and added stabilizers have made enormous improvements to the welding characteristics of ferritic stainless steels. In addition, due to their lower thermal expansion and higher thermal conductivity, distortion and buckling is much lower during welding compared to austenitic or duplex stainless steels.
Supra 316/4401 is a widely used Molybdenum alloyed austenitic stainless steel. It’s an all-purpose product with very good corrosion resistance and is suitable for a wide variety of applications that require good formability and weldability. Supra 316/4401 can be delivered with a variety of surface finishes.
EN 1.4401
ASTM type 316
ASTM UNS S31600
Microstructure Austenitic
Typical applications
Product forms
Datasheet
Chemical composition
C 0.04
Cr 17.2
Ni 10.1
Mo 2.1
N -
Others -
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Supra 316L/4404 is a low-carbon alternative to Supra 316/4401. The lower carbon content minimizes carbide precipitation as a result of heat input, for example during welding, giving improved resistance against intergranular corrosion.Supra 316L/4404 is suitable for a wide variety of applications that require good formability and weldability, and can be delivered with a variety of surface finishes.
EN 1.4404
ASTM type 316L
ASTM UNS S31603
Microstructure Austenitic
Typical applications
Product forms
Datasheet
Chemical composition
C 0.02
Cr 17.2
Ni 10.1
Mo 2.1
N -
Others -
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The highest strength stainless steel in the Supra range. Supra 316plus is a cost-efficient, 21Cr lower-nickel/molybdenum alternative to traditional molybdenum austenitics like Supra 316L. This product has good formability, excellent weldability, and is usable in cryogenic applications.
EN 1.4420
ASTM type -
ASTM UNS S31655
Microstructure Austenitic
Typical applications
Datasheet
Chemical composition
C 0.02
Cr 20.3
Ni 8.6
Mo 0.7
N 0.19
Others -
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A high-strength, high-formability product often used in container transports and where there is an elevated temperature requirement.
SANS 1.4402
ASTM type -
ASTM UNS -
Microstructure Austenitic
Typical applications
• Container tanksDatasheet
Chemical composition
C 0.02
Cr 17.2
Ni 10.1
Mo 2.1
N -
Others -
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A product with high resistance to non-oxidizing acids and chloride-containing media due to higher molybdenum content. Supra 316/4436 has good formability and weldability.
EN 1.4436
ASTM type 316
ASTM UNS S31600
Microstructure Austenitic
Typical applications
Product forms
Datasheet
Chemical composition
C 0.04
Cr 16.9
Ni 10.7
Mo 2.6
N -
Others -
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Supra 316L/4432 is a low-carbon alternative to Supra 316/4436. The lower carbon content minimizes carbide precipitation as a result of heat input, for example during welding, giving improved resistance against intergranular corrosion.
EN 1.4432
ASTM type 316L
ASTM UNS S31603
Microstructure Austenitic
Typical applications
Product forms
Datasheet
Chemical composition
C 0.02
Cr 16.9
Ni 10.7
Mo 2.6
N -
Others -
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A Supra 316L/4435 alternative with higher chromium and nickel content for enhanced corrosion resistance and formability.
EN 1.4435
ASTM type 316L
ASTM UNS S31603
Microstructure Austenitic
Typical applications
Product forms
Datasheet
Chemical composition
C
0.02
Cr 17.3
Ni 12.6
Mo 2.6
N -
Others -
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A titanium-stabilized alternative to Supra 316L/4404 – mainly used in Germany for elevated temperature applications. Due to its titanium-stabilization this product is weldable in all thickness ranges.
EN 1.4571
ASTM type 316Ti
ASTM UNS S31635
Microstructure Austenitic
Usage
Product forms
Datasheet
Chemical composition
C 0.04
Cr 16.8
Ni 10.9
Mo 2.1
N -
Others Ti
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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.
EN 1.4521
ASTM type 444
ASTM UNS S444000
Microstructure Ferritic
Typical applications
Product forms
Datasheet
Chemical composition
C 0.02
Cr 18.0
Ni -
Mo 20
N -
Others Nb,Ti
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| 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:
