a529 grade 50 steel

You need to look at those specs and see what all the requirements are. It only needs to meet one of them. Hg Eng Tips policies FAQ731 376Eng Tips Forum PoliciesPossibly the reason for rejection is the potential difference in ductility of the two materials. The specification is for a mild steel with good ductility. The supplied steel has higher strength but lower extensibility (ductility) and thus might be a reason for the rejection. Ask the structural engineer of record for clarification on the rejection.Another reason is that the Engineering Specifications do not reflect 21st Century metallurgy and design philosophy. A 36 forever!!!If the certification had not referenced any ASTM or other Standard, would the engineer have rejected the parts/paperwork? If the vendor has reconciled the Chemistry and Strength properties and they align with the ASTM Standards you allow, I would be hard pressed to accept the engineers rejection.I get a lot of this on my projects A36, JIS 4106 SMYA, etc. with a need to try to figure out equivalents. The way I have looked at it, say for deformed steel rebar, the steel doesn't "know" what spec it is supposed to meet. So, look at the mill certificates for your project's requirements, say ASTM A615 and compare the mill cert to it for mechanical, chemical and physical properties. If it passes, it is good even thought the steel might have been made to Thai SD40. Many times I have found that the specification is designed based on strength the designers might not have the foggiest idea of the minutiae of the chemical properties.A992 Cost vs. A36 Structural engineering other technical Nov 04, 2009ASTM A1011 vs ASTM A36 ASTM (testing materials) Code Jul 15, 2009See more results