The SAE 1045 steel is a steel with low processing hardenability,IE low penetration hardness on cross section, is not recommended for use sections exceeding 60 mm. It has a good relation between strength and fracture resistance. It is used in general with hardness 180-300 HB. For large sections using the normalizing heat treatment.
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http://www.bsteelplate.com/Industry-News/SAE1045-steelcarbon-steel-pipetube-Heat-treatment.html
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