What is the advantage of S690Q vs S690QL over hr coil

What is the specific use of S690Q vs S690QL, hot rolled plate in daily life? First of all, hot rolled plate is used in bridge, vehicle structure, frame and other fields to play a role of bearing pressure. Secondly, high pressure boiler vessels are also made of hot rolled plates, which can be heat-resistant and airtight, and can stably seal the hot gas in the container. Thirdly, stainless steel hot rolled plate can be used to process hardware products. It has excellent corrosion resistance, and is easy for processing.

ASTM A36 H beam is a common wide flange beam used in construction and machinery for its medium strength. Low carbon S690Q vs S690QL content makes it easy to be welded, machined as well as formed. Therefore, it is often employed by light applications where strength need is not so important.

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A small amount of Nb is sufficient to obtain excellent comprehensive properties of S690Q vs S690QL etc. steel material, because at low Nb concentration, the yield strength of steel material increases faster and is proportional to the concentration, but when the Nb content is greater than 0.03%, the strengthening effect begins to decrease. Studies have shown that when the Nb content is greater than 0.06%, excess Nb will no longer strengthen the steel material.