cold finished low alloy seamless steel tubes ASME SA423 Grade 1
SA423 specification covers minimum-wall-thickness, seamless and electric-resistance welded, low-alloy steel tubes for pressure containing parts such as economizers or other applications where corrosion resistance is important
Corten steel is a foreign name for weathering steel, mainly used for economizer, air preheater, heat exchanger and evaporator working in high sulfur flue gas, used to resist condensation corrosion of sulfur flue gas, with excellent sulfur ion resistance, corrosion ability.
Corten-A steel tube 09CuPCrNi A Chemical composition and mechanical properties
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Chemical composition
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C
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SI
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MN
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CR
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CU
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Ni
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P
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S
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Mo
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≤0.12
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0.25-0.75
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0.2-0.5
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0.3-1.25
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0.25-0.55
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≤0.65
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0.07-0.15
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≤0.04
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--
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mechanical properties
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Tensile strength（Mpa）
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yield strength (Mpa)
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elongation (%)
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Brinell hardness
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flattening
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≥480
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≥343
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≥22
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Corten A chemical compostion mainly contains C (max 0.12%),Si (0.25-0.75%),Mn (0.2-0.5%),P(0.07-0.15%),S(max 0.03%),Cr(0.3-1.25%).Ni (max 0.65%),Cu(0.25-0.55%).
According to the chemical composition , Corten A is made from adding common steel to a small amount of Cu, Cr, P elements and so on, then making some special process. Thus its corrosion resistance is about 3 to 8 times higher than the common steel. Besides, Cu, Ni element makes the steel possessing the properties,such as tenacity, ductility,shaping,welding,cutting,abrasion,fatigue resistance.
For corten A mechanical property, Corten A is made according to ASTM standard which with the yield strength of 355MPa and the tensile strength of 470-630MPa. Corten A weather-ability is about 3-8 times better than common steel, and painting property is 1.5-10 higher than common steel. Besides, corten A can be use under reduction,exposure or simplified painted.
Thailand AEE purchased A234 GR1 76.2*2.77
