ABSTRACT
The German DASt-Ri 0 1 1 ( F e b r u a r y 1 9 7 9 ) "Hochfeste, schweiBgeeignete Fe i n k o r n b a u - s t a h l e StE 4 6 0 und StE 6 9 0 , Anwendung f i i r S t a h l b a u t e n " c o n s i d e r s t h e i n c r e a s e d use o f h i g h - s t r e n g t h f i n e - g r a i n e d s t r u c t u r a l s t e e l s s u i t a b l e f o r w e l d i n g . Meanwhile, t h e i r f i e l d o f a p p l i c a t i o n covers the c o n s t r u c t i o n o f t a n k s , p i p e - l i n e s , v e h i c l e s and cranes as w e l l as s t e e l b u i l d i n g s . This development i s c l o s e l y a s s o c i a t e d w i t h t h e pr o g r e s s e s i n the s t e e l m a n u f a c t u r i n g and w e l d i n g t e c h n i q u e s . Due t o t h e i r low carbon c o n t e n t and t h e i r h i g h s t r e n g t h a g a i n s t b r i t t l e f r a c t u r e , owing t o t h e i r f i n e - g r a i n e d s t r u c t u r e , these s t e e l s can be welded m a n u a l l y and a u t o m a t i c a l l y i n a l l u s u a l w e l d i n g p r o c e d u r e s . The economy of t h e h i g h - s t r e n g t h s t e e l s i s due t o h i g h a l l o w a b l e s t r e s s e s compared t o the c o n v e n t i o n a l s t r u c t u r a l s t e e l s St 3 7 and St 5 2 , which i s e s p e c i a l l y advantageous f o r s t r u c t u r a l members under t e n s i l e s t r e s s e s and s t r u c t u r e s under w o r k i n g s t r e s s e s .
