Fe 550D CRS

PS min 550.0 N/mm² TS/YS ≥ 1.08 N/mm² Ten. St.(Min) 600 N/mm² Elongation 14.5 %

C 0.25 % S 0.040 % P 0.040 % S+P 0.075 % Cr - Ni - Cu - Cr+Cu+Ni 0.40 % N 0.012 % Carbon Equivalent 0.61 %

Test piece should be doubled over the mandrel by continuous pressure until the sides are parallel (180°) No rupture or cracks in the bent portion ≤20mm-4φ | >20mm-5φ Bend bar up to 135°(cooled after kept in boiling water for 30 minutes) bend back to have an included angle of 157.5° No rupture or cracks in the bent portion ≤10mm-5φ | >10mm-7φ