Their website says its high tensile steel.
It appears to be hot dip galvanized.
If so, I wonder how they avoid hydrogen embrittlement.
OK, I'll bite. I thought you only got hydrogen embrittlement when there was molecular hydrogen around, either directly or as a result of water breaking down in welding or electrolysis. Why would it be a problem with hot dip galvanizing?
You don't ask, you don't learn.
Hot dip Galv is a zinc rich coating that's an alloy of iron and zinc, with a composition gradient that ranges from iron (well steel actually) at about 98% Fe, to 99% Zn on the surface, with main areas of composition of 90Zn/10Fe, 95/5, 98/2 99/0. (Zinc isn't 100% pure)
This alloying action only occurs where the steel is chemically clean. Dip unclean (oxidized ) steel into molten zinc and it gets hot, but not galvanized. (450C)
Now to the hydrogen embrittlement:
To get the steel clean it is immersed in hydrochloric acid. (usually preceeded by a degreaser which is alkaline), and remains in HCl for from 30 mins to sometimes 3 hours, depending on rustiness.
While it is "pickling" in acid, some H2 is formed.
High tensile steels in presence of gaseous H2 can become embrittled.
It is possible to "clean" the steel by blast cleaning, but the reprofiling that often results alters the coating characteristics. Sometimes positively, sometimes adversely depending on the other factors involved.
It could be that the anchors is galvanized that way.
Most steel is chemically cleaned, it's rare that steel is blasted before galvanizing, though many people wrongly think that blasting is a pre-requisite.
About 900 tonnes of steel in galvanized in Scotland per week, and that accounts for about 6% of the UK steel so processed. The industry grows at about 4% per annum year on year for the last 30 years.
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