Properties of cold-rolled high-strength steel sheets
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m a j o r t a s k s i m p o s e d on a u t o m o b i l e b u i l d e r s of l a t e , the following two a r e to be cited. One i s the s t r e n g t h e n i n g of c a r b o d i e s that a i m s at ESV ( E x p e r i m e n t a l Safety V e h i c l e ) and MVSS (Motor V e h i c l e Safety Standard) w h i c h a r e being p r a c t i c e d in the f o r m of r e d u c i n g the d a m a g e to c a r b o d i e s d u r ing c o l l i s i o n in o r d e r to s e c u r e i m p r o v i n g the s a f e t y of d r i v e r s . T h e o t h e r i s the r e d u c t i o n of c a r body weight to d e a l with the t e n d e n c y for c a r body w e i g h t to i n c r e a s e due to i n s t a l l a t i o n of e x h a u s t g a s c o n t r o l d e v i c e s f o r pollution c o n t r o l , and to m e e t the d e m a n d for e n e r g y s a v i n g that has b e e n t o u c h e d off by t h e o i l c r i s i s . To m e e t t h e s e two t a s k s , a t t e m p t s a r e b e i n g m a d e to u s e s t e e l s h e e t s of h i g h e r s t r e n g t h than b e f o r e f o r s o m e p a r t s of the c a r body. V a r i o u s g r a d e s of hot r o l l e d s t e e l s h e e t s have b e e n d e v e l o p e d , a s high t e n s i l e s t e e l s h e e t s f o r a u t o m o b i l e s o r p i p e s t o c k . F o r c o l d - r o l l e d s h e e t s , however, sufficient attempts towards higher strength have not b e e n m a d e , so that it would be m o r e a p p r o p r i a t e to r e f e r to t h e m a s a new m a t e r i a l f o r a u t o m o b i l e s . With the c o l d - r o l l e d h i g h - s t r e n g t h s t e e l s h e e t s , i m p o r t a n c e is a t t a c h e d to the r e l a t i o n b e t w e e n s t r e n g t h and f o r m a b i l i t y , in c o n t r a s t to the h e a v y p l a t e s f o r s h i p s in w h i c h the r e l a t i o n b e t w e e n s t r e n g t h and t o u g h n e s s is an i m p o r t a n t c o n s i d e r a t i o n . F o r m a b i l i t y h e r e r e f e r s , p r i n c i p a l l y , to such c h a r a c t e r i s t i c s a s d r a w a b i l i t y that is r e p r e s e n t e d by the r v a l u e , and the n v a l u e o r elongation, and b e n d a b i l i t y that is K. TODA is Deputy General Superintendent of the Works, H. GONDOH is General Manager of the Technical Research Office, H. TAKECHI is Manager of the Steel Materials Research Section, H. MASUI is Assistant Manager of Steel Materials Research in Kimitsu Works, Nippon Steel Corporation, Chiba Pref., Japan. Manuscript submitted July 3, 1974. METALLURGICAL TRANSACTIONS A
r e p r e s e n t e d b y the m i n i m u m b e n d i n g r a d i u s with which b e n d i n g is p o s s i b l e without the o c c u r r e n c e of cracks. In t h i s p a p e r the p r o p e r t i e s of c o l d - r o l l e d highs t r e n g t h s t e e l s h e e t s will be d i s c u s s e d . E X P E R I M E N T A L PROCEDURE S t e e l s of c h e m i c a l c o m p o s i t i o n s shown in T a b l e s I and II have b e e n p r o c e s s e d t h r o u g h 250 ton and 60 ton oxygen c o n v
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