As a steel fabricator,normally ASTM A709Gr50W (weathering steel plate) can roll max. thickness till 100mm (4inch),when improving technicals and heat treatment,some mills can roll max. of A709Gr50W till 300mm and guarantee steel quality.Can cheacking on...
Firstly,there is no such grade Sst45.3 in all steels.So you'd better confirm it again.It better to be informed the steel standard.
For information of similar writing grades:
St52-3(St52.3),it is low alloy steel grade in German steel standard Din17100,you can check on St52-3 mechanicals...
S275 belongs to carbon steel plate,it contains S275JR,S275J0 and S275J2 three different classes owning to the different low temperature when doing impacting test.
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