Stainless Steel
ASTM A815 (S31803/S32205)

Datasheet Updated

05 August 2021

Specifications

Commercial

ASTM A815

US

S31803

A duplex stainless steel with a microstructure of 50:50 austenite and ferrite.

Chemical Composition

Element % Present

Carbon (C)

0.00 - 0.03

Chromium (Cr)

21.00 - 23.00

Phosphorous (P)

0.00 - 0.03

Sulphur (S)

0.00 - 0.02

Nickel (Ni)

4.50 - 6.50

Nitrogen (N)

0.08 - 0.20

Molybdenum (Mo)

2.50 - 3.50

Iron (Fe)

Balance

Manganese (Mn)

Balance

Silicon (Si)

Balance

Alloy Designations

Grade UNS 31803 is similar to:

  • 2205
  • EN 1.4462Z
  • UNS S31803
  • UNS S32205
  • BS 318S13
  • 318

Supplied Forms

  • Bar
  • Fittings & Flanges
  • Pipe
  • Tube
  • Sheet
  • Plate

Applications

  • Chemical processing, transport and storage
  • Oil and gas exploration and offshore rigs
  • Oil and gas refining
  • Marine environments
  • Pollution control equipment
  • Pulp & paper manufacturing
  • Chemical process plant

Characteristics

  • High resistance to stress corrosion cracking
  • High resistance to general corrosion, pitting, and crevice corrosion
  • High resistance to erosion corrosion and corrosion fatigue
  • High mechanical strength - roughly twice the proof strength of austenitic stainless steel
  • Physical properties that offer design advantages
  • Good weldability

Mechanical Properties

Property Value

Proof Stress

450 Min MPa

Tensile Strength

620 Min MPa

Elongation A50 mm

25 Min %

Hardness Brinell

290 Max HB

Disclaimer

This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon. Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed S online) and manufacturers' data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources. Material supplied by the Company may vary significantly from this data but will conform to all relevant and applicable standards. As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied. Advice given by the Company to any third party is given for that party's assistance only and without liability on the part of the Company. All transactions are subject to the Company's current Conditions of Sale. The extent of the Company's liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.