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Basic Steel Selection Based on BS 970

Stainless steel

Notes

BS 970 grade 416S21
(EN 56)

Martensitic (magnetic) can be hardened and tempered to give improved tensile strength.  FM ** grade.  Typical applications include cutlery, surgical instruments, fasteners, valves, spindles and shafts.

BS 970 431S29
(EN 57)

Martensitic (magnetic) supplied heat treated with a high tensile strength.  Typical applications include cutlery, surgical instruments, fasteners, valves, spindles and shafts.

BS 970 430S15
(EN 60)

Ferritic.  Low strength but good Ductility.  Used Food Processing and catering equipment and automotive trim, car exhaust systems ect.

BS 970 grade 304S15
(EN 58)

Formed an welded, used mainly in domestic dairy and decorative appliances.  General purpose grade for corrosion resistant applications.  This grade is the most widely used of all stainless steels.  Its chemical composition provide the best all round performance stainless steel at the relatively low cost.  It has excellent low temperature properties.  Lower carbon grades (S15 and less) have improved weld ability.

BS 970 316S16
(EN 58 J)

Austenitic (non magnetic) cannot be heat treated the work hardens.  It offers high resistance to corrosion and is used for generally machined components and pipe fittings.  This grade is almost as popular as the 304 grade, the increased MO content makes the still more suitable for resisting pitting and crevice than 304 grade.  Lower carbon grades (S15 and less) have improved weld ability.

BS 970 321S12
(EN 58 B-C)

Austenitic (non magnetic) cannot the heat treated at work hardens.  Titanium stabilised, which offers improved welding properties.

BS 970 310S31

Austenitic (non magnetic) possesses good resistance to scaling at high temperatures.  For continuous high temperatures service in the range of 850 -1000 degrees C.



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