 
  
 
- - 
 
 
 
 
.. .... 
 
  
  
   
 
 
 
 
 
 - 256 
 .... ....) 
 
 ................. 
  ...................................... 
 
 
 
 
 
 
 
 
 
 
 
 
 –25
unalloyed and alloy steels)
(
(skin pass temper rolling) roll forming)
“” /
5 
“ ” 
(coil) 
“ ” 
-- temper rolling) temper rolling) ((unalloyed and alloy steels)unalloyed and alloy steels)unalloyed and alloy steels)unalloyed and alloy steels)unalloyed and alloy steels)unalloyed and alloy steels)-25
(mill edge) 
(cut edge) 
trimmed edge slit edge sheared edge
5%
( ) 
mm
(forming quality)
(improved forming quality)
-2- ) ) 5%5%5%5%–25
 — 
  
  
ReH Rp0.2   Rm  
A
2
5
(transverse test piece) 
 ( ) 
  
JIS G
-- -25
2 ReH Rp0.2
Rm A
Rm
MPaReH
Rp0.2
MPaA%
mm
5 22 2 2 25
5 2 22 2 2
2 2 22
5— 2 25 26
5— 22 2 2
)
A 
)
-- 
2225522
22255
2–25
() 
      
+25
2 
)
5  
)
-5- -25
5
76)
—
22
—
— — —
  
  
-6- ——2222
—2222–25
)
(test unit)
2 (sample product)
(sample)
(rough specimen)
5 (test piece)
2)
-7- 5(test unit)
-25
(lot) 
)
/
6)
2) 7)
)
)
67
-- //–25
62 )
r
 (
  
r
() 
r
t
t t
t t
t t
t t
t t
2  
)
5 mm 
2
(
-- ) ) -25
__________________________
-- 