Outokumpu Supra range Supra 316plus

Austenitic Outokumpu Supra 316plus (EN 1.4420, ASTM UNS S31655) is designed for highly corrosive environments. Its high chromium and nitrogen content delivers improved corrosion resistance. The grade has high strength, good formability and excellent weldability. Supra 316plus works extremely well for challenging conditions.

Supra 316plus enables lighter structures, that, in turn, can allow increased transport load volumes resulting in a decreased total number of transports needed. These factors can even reduce the fuel consumption, thus Supra 316plus leaving a lower a carbon footprint.

The high chromium content makes the Supra 316plus appropriate for replacing standard grades in many applications. Supra 316plus is ideal for a variety of applications including LNG, tank containers, heat exchangers, water treatment and tubular projects. The grade also works well in architectural applications.

 

Outokumpu Supra 316plus is designed for highly corrosive environments, but it can even decrease companies’ carbon footprint due to its strength that allows lighter structures.

Key benefits of Outokumpu Supra 316plus

Value for money

  • Offers value to customer due to improved alloying
  • Better cost stability compared to standard Cr-Ni-Mo alloyed austenitic grades
  • Makes thinner gauges possible, enabling lighter structures

Improved corrosion resistance

  • Considerable improvement over typical austenitic grades
  • High chromium and nitrogen content with moderate molybdenum content improve resistance against uniform corrosion
  • Good resistance against intergranular corrosion in welds due to low carbon and high nitrogen content

Higher strength

  • Remarkably higher strength than standard austenitic stainless steel due to nitrogen alloying
  • Grade's strength and elongation combination becomes very attractive in cryogenic temperature down to -196 Celsius
  • Makes thinner gauges possible, enabling lighter structures

Supra 316plus

Description 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

  • Process and transport tanks
  • Water treatment and pipes
  • Heat exchangers
  • Architectural applications

Datasheet Download Supra range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

Chemical composition

C 0.02

Cr 20.3

Ni 8.6

Mo 0.7

N 0.19

Others -

 

Finish EN

Finish ASTM

Thickness (mm)

Width (mm)

1D

1

3.508.00

up to 1250

1D

1

6.008.00

up to 1500

2E RAP

1

2.304.50

up to 1000

2E RAP

1

2.604.50

up to 1250

2E RAP

1

3.204.50

up to 1500

2B

2B

0.705.00

up to 1250

2B

2B

1.005.00

up to 1500

2K

4

0.704.00

up to 1250

2K

4

1.004.00

up to 1500

 

 

STANDARDS AND APPROVALS

EN 10028-7: 2016

Flat products made of steels for pressure purposes – Part 7: Stainless steels.

Available

PED Directive 2014/68/EU

European Pressure Equipment Directive

Available

ASTM A240/A240M-17

Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

Available

ASME Code Case 2903

Case 2903 20Cr-8.5Ni-0.7Mo-0.2N, UNS S31655 Austenitic Steel, alloy Plate, Sheet, and Strip Section VIII, Division 1

Available

AD 2000-Merkblatt W2

Available Particular Material Appraisal (PMA) for AD 2000-Merkblatt W2

Available

Lloyd's Register approval

Certificate No: MD00/1165/0008/1. Steelmaking, Semi-Finished Products, Plates, Hot Rolled Coil and Coil

Available

DNV-GL approval

Certificate No: AMMM00001DW. Steelmaking and Rolled Steel Products

Available

ASTM A249/A249M-16a

Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes

Available

ASTM A269/A269M-15a

Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

Available

ASTM A358/A358M-15

Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications

Available

ASTM A554-16

Standard Specification for Welded Stainless Steel Mechanical Tubing

Available

ASTM A312/S312M-17

Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

Available

NACE

NACE MR0103 / ISO 17945 and NACE MR0175/ISO 15156-1 / NACE MR0175/ISO 15156-3

Available

 

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