JIS Standard for plain carbon steel-structural steel
Full description
Full description
T a bl e3Cr − Most Mo e e l sf orma c hi nes t r uc t ur a lus e( Ex c e r p t e df r o mJ I SG 4 0 5 3− 20 0 3andsuppl e me me nt e dwi t hAI SI / SAE)
Carbon*2
Brinell
Chemi c al c ompos i t i on( %)
J I S
Te ns i l et es t
℃) He att r e at me nt (
ss
g r a d e ( AI SI / *4 SAE)
hardne
C
Si
Mn
Cr
Mo
Tensile T ensile
Elongatio
strength
n
(MPa)
()
equivale
Weldability* 3
nt
!uen"h !ue n"hing ing
Te#$ e#$eri ering ng
&st +,
SCM4 M415
0 . 1 3
0 . 1 5
0 . 6 0
0 . 9 0
0 . 1 5
( -)
~0 . 1 8
~0 . 3 5
~0 . 9 0
~1 . 2 0
~ 0. 2 5
%830
%16
235
-il "ooling
~321
2nd +
150~200 Ai r
0 . 5 6
.
0 . 5 9
.
0 . 6 1
.
0 . 6 2
.
0. 71
×
0. 71
×
0. 76
×
0. 81
×
c ool i ng
-il "ooling &st +,
SCM4 M418
0 . 1 6
0 . 1 5
0 . 6 0
0 . 9 0
0 . 1 5
( -)
~0 . 2 1
~0 . 3 5
~0 . 9 0
~1 . 2 0
~ 0. 2 5
%880
%15
248
-il "ooling
~331
2nd +
150~200 Ai r c ool i ng
-il "ooling &st +,
SCM4 M420
0 . 1 8
0 . 1 5
0 . 6 0
0 . 9 0
0 . 1 5
( -)
~0 . 2 3
~0 . 3 5
~0 . 9 0
~1 . 2 0
~ 0. 2 5
%930
%14
262
-il "ooling
~352
2nd +
150~200 Ai r c ool i ng
-il "ooling &st +,
SCM4 M421
0 . 1 7
0 . 1 5
0 . 7 0
0 . 9 0
0 . 1 5
( -)
~0 . 2 3
~0 . 3 5
~1 . 0 0
~1 . 2 0
~ 0. 2 5
%980
%14
285
-il "ooling
~375
2nd +
150~200 Ai r c ool i ng
-il "ooling
SCM4 M430
0 . 2 8
0 . 1 5
0 . 6 0
0 . 9 0
0 . 1 5
( 4 1 3 0 )
~0 . 3 3
~0 . 3 5
~0 . 9 0
~1 . 2 0
~ 0. 3 0
SCM4 M432
0 . 2 7
0 . 1 5
0 . 3 0
1 . 0 0
0 . 1 5
( -)
~0 . 3 7
~0 . 3 5
~0 . 6 0
~1 . 5 0
~ 0. 3 0
SCM4 M435
0 . 3 3
0 . 1 5
0 . 6 0
0 . 9 0
0 . 1 5
( 4 1 3 7 )
~0 . 3 8
~0 . 3 5
~0 . 9 0
~1 . 2 0
~ 0. 3 0
0 . 3 8
0 . 1 5
0 . 6 0
0 . 9 0
0 . 1 5
~0 . 4 3
~0 . 3 5
~0 . 9 0
~1 . 2 0
~ 0. 3 0
SCM4 M440 ( 4 1 4 0 , 4142)
%830
%880
%930
%980
%18
%16
%15
%12
241
3+
~302
-il "ooling
255
3+
~321
-il "ooling
269
3+
~331
-il "ooling
285
3+
~352
-il "ooling
550~650 Ra pi d c ool i ng 550~650 Ra pi d c ool i ng 550~650 Ra pi d c ool i ng 550~650 Ra pi d c ool i ng