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347

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347 / 1.4550

347 stainless steel is variant of the basic austenitic 18/8 Grade 304 with added Columbium – the introduction of Columbium stabilizes the steel and eliminates carbide precipitation which subsequently causes intergranular corrosion.

The steel has excellent forming and welding qualities and excellent toughness even at cryogenic temperatures. 


347 Chemical Composition:
UNS No Grade C Si Mn P S Cr Mo Ni N Other
S34700 347 0.08 0.75 2.00 0.045 0.030 17.00/19.00 – 9.00/13.00 – Cb:10xC1.00

347 Mechanical Properties:
UNS No Grade Proof Stress
0.2% (MPa)		 Tensile Strength
(MPa)		 Elongation
A5(%)		 Hardness Max
HB HRB
S34700 347 205 515 40 201 92

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