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BS 3059: STEEL BOILER AND SUPERHEATER TUBES  

Chemical Composition
Steel Grade C % Mn % Si % P % S % Cu %  Ni % Mo %  Cr %  V %
360 0.17 max 0.40-0.80 0.10-0.35 0.035 max 0.035 max
440 0.12-0.18 0.90-1.20 0.10-0.35 0.035 max 0.035 max
243 0.12-0.20 0.40-0.80 0.10-0.35 0.035 max 0.035 max 0.25-0.35
620-460 0.10-0.15 0.40-0.70 0.10-0.35 0.030 max 0.030 max 0.45-0.65 0.70-1.10
Mechanical Properties
Steel Grade Tensile Strength MPA Yield Strength MPA Elongation % HB
360 360-500 235 min
440 440-580 245 min
243 480-630 275 min
620-460 460-610 180 min

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