Chemical Composition of Stainless Steels To BS 3100
Chemical composition of stainless steels to BS-3100
BS 3100 is the material standard for stainless steel castings for corrosion resisting purposes.
The chemical composition of stainless steel grades covered in the this standard include, 410C21, 420C28,
420C29, 425C12, 425C11, 302C25, 304C12, 304C15, 347C17, 316C12, 316C16, 317C16, 318C17, 332C11,
332C13, 332C15, 420C24, 452C11, 452C12, 302C35, 309C30, 309C40, 310C45, 311C11, 330C12, 331C60,
334C11, 309C32, 309C35, 310C40, 330C11, 331C40
CHEMICAL COMPOSITION OF STAINLESS STEELS TO BS 3100
Introduction
BS 3100, Steel castings for general engineering purposes, was published in 1991 and covers a wide range
of steel casting grades. These include the stainless steels in the following tables. Some of these grades are
similar to grades published more recently in BS EN 10283, as European grades, but BS 3100 uses the ‘traditional’
BS grade designation types. This table should be useful in identifying some of the older ‘BS’ castings grades.
BS EN 10283 does not supersede BS3100 as this also includes non-stainless steel casting grades.
Only the chemical compositions of the stainless steels in BS3100 are listed. Grades shown with a suffix ‘LT 196’
are intended for low temperature applications and are required to pass a Charpy impact test at -196 C by the standard.
As an alternative to scanning down the list try the ‘find’ facility on your keyboard, using the ‘Ctrl’ and ‘F’ keys together.
Type in the term you are looking for in the dialog box that then appears.
The data given is not intended to replace that shown in individual standards to which reference should always be made.
BS 3100 chemical composition table
Grade
Chemical composition % by mass (max unless otherwise stated)
C Si Mn P S Cr Mo Ni Others
410C21 0.15 1.0 1.0 0.040 0.040 11.5/13.5 – 1.00 Cu 0.30
420C28 0.20 1.0 1.0 0.040 0.040 11.5/13.5 – 1.00 Cu 0.30
420C29 0.20 1.0 1.0 0.040 0.040 11.5/13.5 – 1.00 Cu 0.30
425C12 0.06 1.0 1.0 0.040 0.030 11.5/14.0 0.40/1.0 3.5/4.5 –
425C11 0.10 1.0 1.0 0.040 0.030 11.5/13.5 0.60 3.4/4.2 –
302C25 0.12 1.5 2.0 0.040 0.040 17.0/21.0 – 8.0 min –
304C12 0.03 1.5 2.0 0.040 0.040 17.0/21.0 – 8.0/12.0 –
304C12 LT196 0.03 1.5 2.0 0.040 0.040 17.0/21.0 – 8.0/12.0 –
304C15 0.08 1.5 2.0 0.040 0.040 18.0/21.0 – 8.0/11.0 –
304C15 LT196 0.08 1.5 2.0 0.040 0.040 18.0/21.0 – 8.0/11.0 –
347C17 0.08 1.5 2.0 0.040 0.040 18.0/21.0 – 9.0/12.0 Nb 8xC/1.0
316C12 0.03 1.5 2.0 0.040 0.040 17.0/21.0 2.0/3.0 9.0 min –
316C12 LT196 0.03 1.5 2.0 0.040 0.040 17.0/21.0 2.0/3.0 9.0 min –
316C16 0.08 1.5 2.0 0.040 0.040 17.0/21.0 2.0/3.0 9.0 min –
316C16 LT196 0.08 1.5 2.0 0.040 0.040 17.0/21.0 2.0/3.0 9.0 min –
317C16 0.08 1.5 2.0 0.040 0.040 17.0/21.0 3.0/4.0 9.0 min –
318C17 0.08 1.5 2.0 0.040 0.040 17.0/21.0 2.0/3.0 9.0 min Nb 8xC/1.00
332C11 0.07 1.5 1.5 0.040 0.040 19.0/22.0 2.0/3.0 27.5/30.5 Cu 3.0/4.0
332C13 0.04 1.0 1.0 0.040 0.040 24.5/26.5 1.75/2.25 4.75/6.00 Cu 2.75/3.25
332C15 0.08 1.5 1.5 0.040 0.040 21.0/27.0 1.75/3.00 4.0/7.00 N 0.10/0.25
420C24 0.25 2.0 1.0 0.050 0.050 12.0/16.0 – – –
452C11 1.00 2.0 1.0 0.050 0.050 25.0/30.0 1.5 4.0 –
452C12 1.0/2.0 2.0 1.0 0.050 0.050 25.0/30.0 1.5 4.0 –
302C35 0.2/0.4 2.0 2.0 0.050 0.050 17.0/22.0 1.5 6.0/10.0 –
309C30 0.5 2.5 2.0 0.050 0.050 22.0/27.0 1.5 10.0/14.0 –
309C40 0.5 2.0 2.0 0.050 0.050 25.0/30.0 1.5 8.0/12.0 –
310C45 0.5 3.0 2.0 0.050 0.050 22.0/27.0 1.5 17.0/22.0 –
311C11 0.5 3.0 2.0 0.050 0.050 17.0/23.0 1.5 23.0/28.0 –
330C12 0.75 3.0 2.0 0.050 0.050 13.0/20.0 1.5 30.0/40.0 –
331C60 0.75 3.0 2.0 0.050 0.050 15.0/25.0 1.5 36.0/46.0 –
334C11 0.75 3.0 2.0 0.050 0.050 10.0/20.0 1.5 55.0/65.0 –
309C32 0.20/0.45 1.5 2.5 0.040 0.040 24.0/28.0 1.5 11.0/14.0 N 0.20
309C35 0.20/0.50 1.5 2.0 0.040 0.040 24.0/28.0 1.5 11.0/14.0 –
310C40 0.30/0.50 1.5 2.0 0.040 0.040 24.0/27.0 1.5 19.0/22.0 –
330C11 0.35/0.55 1.5 2.0 0.040 0.040 13.0/17.0 1.5 33.0/37.0 –
331C40 0.35/0.55 1.5 2.0 0.040 0.040 17.0/21.0 1.5 37.0/41.0 –
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