Stainless Steel - General Information - Stainless Steel for Structural Applications

Stainless Steel for Structural Applications

Guidelines for the selection of the correct stainless steel grade in structural applications according to the service environment: Euro Codes 1 to 4 provide a procedure for selecting the appropriate grade of stainless steel for the service environment of structural members. The environment is assessed using Corrosion Resistance Factor (CRF) and the stainless grades are placed in Corrosion Resistance Classes (CRC) I, I, III, IV & V according to CRF value.

Calculation of Corrosion Resistance Factor (CRF)

The Corrosion Resistnace Factor is comprised of three elements: F1, F2 & F3.

F1 rates the risk of exposure to chlorides from salt water/sea water or de-icing salts

F2 rates the risk of exposure to Sulphur Dioxide

F3 rates the cleaning regime or exposure to washing by rain

Calculating F1: Risk of exposure to Chlorides

M is distance from sea

S is distance from roads where de-icing salts are used

F1 ValueDescription
1Internal, Controlled Environment
0Low Risk of Exposure: M.10km or S>0.1km
-3Medium Risk of Exposure: 1km<M<10km or 0.01km<S<0.1km
-7High Risk of Exposure: 0.25km<M<1km or S<0.01km
-10Very High Risk of Exposure: Road Tunnels where de-icing salts used
-10Very High Risk of Exposure: M<0.25km: North sea coast of Germany & All Baltic Coastal Areas
-15Very High Risk of Exposure: M<0.25km - InclAll other European/UK Coastal Areas

Calculate F2: Risk of exposure to Sulphur Dioxide

Note: In European coastal environments the SO2 value is usually low. For inland environments the value is either low or medium.  High values are usually associated with heavily industrialised locations or sepcific environments such as tunnels.

In the table the deposition values are given in the units micro-grams per cubic metre

F2 ValueDescription
0Low Risk of Exposure: 10 average deposition
-5Medium Risk of Exposure: 10-90 average deposition
-10High Risk of Exposure: 90-250 average deposition

Calculate F3: Cleaning or Rain Washing

F3 relates to either the Cleaning Regime or the expsoure to Washing by Rain.

NB: If F1 + F2 = 0 then F3 = 0

F3 ValueDescription
0Fully exposed to washing by rain
-2Specified cleaning regime
-7No washing by rain or specified cleaning regime

Calculation of CRC

The Corrosion Resistance Class (CRC) required for the given enviroment is given by first calculating the Corrosion Resuistance Factor (CRF) through adding F1+F2+F3.

0 to Under -7II
-7 to Under -15III
-15 to Under -20IV
Over -20V

CRC by Grade

An appropriate stainless steel garde for the environment can now be chosen from the table below showing the CRC for the various commonly available grades.

CRC ClassGrades
I (Ferritic)1.4003 / 1.4016 (430) / 1.4512 (409)
II (Standard 18/8 Austenitic)1.4301 (304) / 1.4307 (304L) / 1.4311 / 1.4541 / 1.4318 / 1.4306 / 1.4567 / 1.4482
III (Mo-Austeniic & Lean Duplex)1.4410 / 1.4404 / 1.4435 / 1.4571 / 1.4429 / 1.4432 / 1.4578 / 1.4462 / 1.4362 / 1.4062 / 1.4162
IV (Super-Austentic & Duplex)1.4439 /1.4539 / 1.4462
V (Super-Austentic & Duplex)1.4565 / 1.4529 / 1.4547 / 1.4410 / 1.4501 / 1.4507

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Last Datasheet Revision

18 July 2019


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 & 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.

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