Tubular solar collectors

Abstract

A metal composition suitable for originating a joint by means of welding with a borosilicate glass for a solar collector. The composition, expressed in weight percentage, comprises the following alloy elements: Ni Co Mn Si C Ti Zr Ta Ti + Zr + Ta 28-31 15-18 ≤0.5 ≤0.3 ≤0.05 ≤0.30 ≤0.30 ≤0.30 ≤0.40 and it is such that 45.5≤(Ni+Co)≤46.5, and that (Ti+Ta+Zr)≥4×C, the remaining part being made up of iron, apart from the inevitable impurities. Additionally, a metal ring made of the metal composition described above and suitable for originating a metal-glass joint by means of welding; the metal-glass joint thus obtained; and the tubular solar collector thus obtained.

Dependencies are inferred from the claim text.