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Standard Specifications Reinforcing Steel Rebar Markings (ASTM)

Grade 40 -50

S- for Billet (A615) I ­ for Rail (A616) IR - for Rail Meeting Supplementary Requirements S1(A616) A ­ Axle (A617)

Grade 60

S- for Billet (A615) I­ for Rail (A616) IR - for Rail Meeting Supplementary Requirements S1(A616) A ­ Axle (A617) W ­ for Low-Alloy (A706) Bars marked with an S or W meet Both A615 andA706

Grade 75

S- for Billet (A615)

Grades 300- 350

S- for Billet - Steel(A615M) I ­ for Rail- Steel (A996M) R - for Rail-Steel (A996M) A ­ Axle- Steel (A996M)

Grade 420

S- for Billet -Steel(A615M) I ­ for Rail (A996M) R - for Rail ­ Steel (A996M) A ­ Axle-Steel (A996M) W ­ for Low-Alloy Steel (A706M) Bars marked with an S or W meet Both A615 andA706

Grade 520

S- for Billet (A615M)

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