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Specifications of Stainless Steel

Grade compositions, mechanical properties and production specifications are governed by a range of international and national standards for stainless steel. While the old AISI three digit stainless steel numbering system (e.g. 304 and 316) is still commonly used for the classification of stainless steel grades, new classification systems have been developed.

These systems include a 1-letter + 5-digit UNS number, like S30400, as defined by SAE and ASTM. European countries are adopting unified Euro norm standards. These countries are either replacing or adapting their own country specific standards to mirror the Euro norm standards. Other designations being replaced include old BS and EN numbers like 304S31 and 58E.

Some grades are not covered by standard numbers and could be proprietary grades or be named using standards for specialist products like welding wire.

Stainless steel standards are explained in detail in the British Stainless Steel Association “Guide to Stainless Steel Specifications”, also known as the BSSA "Blue Guide".

The table below lists a range of stainless steel grades, their old BS designation, new UNS number and new EN designation.

Grade UNS No BS Euro norm No.
301 S30100 301S21 1.4310
302 S30200 302S25 1.4319
303 S30300 303S31 1.4305
304 S30400 304S31 1.4301
304L S30403 304S11 1.4306
304H S30409 - 1.4948
(302HQ) S30430 394S17 1.4567
305 S30500 305S19 1.4303
309S S30908 309S24 1.4833
310 S31000 310S24 1.4840
310S S31008 310S16 1.4845
314 S31400 314S25 1.4841
316 S31600 316S31 1.4401
316L S31603 316S11 1.4404
316H S31609 316S51 -
316Ti S31635 320S31 1.4571
321 S32100 321S31 1.4541
347 S34700 347S31 1.4550
403 S40300 403S17 1.4000
405 S40500 405S17 1.4002
409 S40900 409S19 1.4512
410 S41000 410S21 1.4006
416 S41600 416S21 1.4005
420 S42000 420S37 1.4021
430 S43000 430S17 1.4016
440C S44004 - 1.4125
444 S44400 - 1.4521
630 S17400 - 1.4542
(904L) N08904 904S13 1.4539
(253MA) S30815 - 1.4835
(2205) S31803 318S13 1.4462
(3CR12) S41003 - 1.4003
(4565S) S34565 - 1.4565
(Zeron100) S32760 - 1.4501
(UR52N+) S32520 - 1.4507

 

ASTM does not recognize the designations in brackets. Many other grades and specifications are available.
Material supplied by Jindalai Steel Group has been manufactured to comply with a number of standards depending upon the product. Standards also cover the finish of the material.

Jindalai Steel Group- the reputed manufacturer of stainless steel in China. Experiencing over 20 years of development in international markets and currently possess 2 factories with a production capacity of over 400,000 tons annually. If you want to get more information about the stainless steel materials, welcome to contact us today or request a quote.

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Post time: Dec-19-2022