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What is the meaning of the number 1,2,3 for DIN standard steels: Rst37-1, Rst 37-2, Rst 37-3. What is the difference between them. Are all these 3 steels appropriate for weldin?
http://cr4.globalspec.com/thread/29838/Chemical-composition-of-steel
http://www.soscoqatar.net/productdisplay.aspx?cid=25
BTW:
1. these are structural steels
2. The DIN 17100 has equivalent steel Nos now in EN10025