2 results about "Weathering index" patented technology

This invention discloses a Q295NH weathering-resistant wire rod, belonging to the field of iron and steel metallurgy. The chemical composition of this weathering-resistant wire rod, by mass percentage, includes: C≤0.15%, Si 0.10%~0.50%, Mn 0.30%~1.00%, P≤0.030%, S≤0.030%, Cr 0.55%~0.65%, Ni≤0.65%, Cu 0.25%~0.55%; the remainder is Fe and unavoidable impurities. This weathering-resistant wire rod has a yield strength ≥295MPa, a tensile strength of 430~560MPa, an elongation after fracture ≥24%, a tensile strength difference within the same coil ≤10MPa, and a weathering index of 6.23~6.98, meeting the long-term service requirements of photovoltaic brackets in outdoor environments. Furthermore, this invention also discloses a production method for the above-mentioned weathering-resistant wire rod and its application in photovoltaic bracket tie rods.

The application discloses a kind of sedimentary basin hydrothermal activity tracer method, belong to geochemistry and isotopic tracer field.The tracer method includes the pretreatment of mixed mineral sample, lithium element separation and purification and δ 7 Li carb Value determination;The correlation analysis of δ 7 Li carb Value and the main trace element characteristics of sample;The measurement δ 7 Li carb Value of mixed mineral sample is corrected: the correlation analysis of corrected data of mixed mineral sample and hydrothermal activity index and anti weathering index;Determine the δ 7 Li 校正后 Background value in study sequence, judge hydrothermal activity enhancement period, hydrothermal activity weakening period or non-hydrothermal dominant period by comparing lithium isotopic ratio of continuous section and background interval value difference.The method has the advantages of continuous high resolution, wide temperature range sensitive response, mechanism is clear, strong anti-interference ability and strong universality.