Post on 06-Nov-2019
Daido JIS Equivalent C Si Mn Cr Mo V
DHAI SKD6l 0.32-0.42 0.80-0.120 < 0.50 4.50-5.50 L00- 1.50 0.80- 1.20
ForgingTemperature
cc)
Condition for heat treatment'C Hardness Transformation Temp "C
Annealing Hardening Tempering SupplyCondition Q.r. Ac Ar Ms
I 100-900820-870
slow coolinp
1000-1050air cooling
(oil coolinE)
s50-650air cooling
<229H8 < 53 HRC 847-9 I 8 769-725320
Y : 1 0 3 0
d
o
F
(-)
a - ^o ) u
E
O Quenching Hardness
1000 1 050
Quenching temperature ('C)
O Relationship Between QuenchingTemperature and Toughness'70
60
50
40
30
20
l 0
I Tempering Hardness
As 100 200 300 400 500 600 700quenched
Tempering temperature CC) (lh air cooling)
950 1000 1050 I 100 I 150
Quenching temperature ('C)
O Resistance Against Softening byTempering (580'C x thr heating)
lInitial hardness 5l I HRC
' f \\-
lni
ltlal haroness9+I HRC
I-5-
l + -Initial hardness 46+l HRC
Quenching temperature1030'C x 3OminGC
Z J
No. of heating times
Q
E 4 8
a
E 4 6
O
;Ji )U
ao
H€E 4 0
A s lquenched
/
* Oi lcool ing
a- Aircooling
Holding me lOmin
Temper 600" lr
z \>-
\
I t t lAir cooling 1050'CAir cooling 1020"CAir cooling 980'C
--o--x-+
a
30
I Dimensional change byHeat Treatment+0.30
+0.20
+0.1 0
0
-0 . l0
-0.20
-0.30As Quenched 100 200 300 400 500 600 700
Tempering temperature ("C)(lh air cooling)
O Tensile Characteristics
o-ts \
Tensile strength
t \Yield point
l / \F
RedurI
ion ofareaI
\
IElongation
I
\
"1--i- | |1030"C Air cooling635'C Air cooling 44.2 HRC
Normal 100 200 300 400 500 600 700rcmperarure
Testtemperature ("C)
O Nitriding Characteristics
1200
1000
800
600
400
200
00.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Distance from the surface (mm)
I
oaq)
EL
oI
ooo
cS
a
()
I Toughness
t20
^ 100
O
- 8 0O
E 6 0
o6 4 t l
h ) o6
o o
\v
oH
o
()
!Goo
rr l
Ino
1,,I20
1 0
0
1600
Normal 300temperature
400 500 600
Testtemperature ('C)
d
S rzooA
O. 6UU
o
(.)H
a l l()
.()
IDiameter
J-Lerrgth
-
Specimen: 625 x 5H: 1030"C Air cool
0mmlng
1l l l l l
:Iardness:47HRC
Iufftride process: 570'C x 3h
r t t l l
t t lH : 1030'C Air coolingT : 635'C Air cooling
(Rolling Direction)t t l
I
2u notch l0min Holding
O Thermal Conductivity (caUcm'sec ' "C)
Daido Brand 25'C 100"c 200'c 300'c 400"c 500"c 600"c 700'c
DHAl 0.0569 0.0605 0.0702 0.0707 0.0687 0.0624 0.07t2 0.0721
O Coefficient of Thermal Expansion (x 10"/ "C)
Daido Brand -100'c -200"c -300"c -400'c -500"c -600'c -700"c
DHAI 10 .5 lt.4 t 2 . l t 2 .8 13 .3 13.7 t3.6
O Continuous Cooling Transformation Curve
Tokyo Head Office
(Export Sales Dept)
Hong Kong Office
U
ko
.o
ftDArDo srEEL co,LTD.: Daido Shinagawa Building, 6-35, 1-Chome, Kounan,
Minato-Ku, Tokyo, Japan
Phone : (813) 5495-1270
Telefax : (813) 5495-6739
: Room 1302, l3lF Asia Orient Tower Town Place,
33 Lockhart Road, Wanchai, Hong Kong
Phone : (852)2865-4646
Telefax : (852) 2527 -2040
(Austenitzing temp. 1030"C)
IMPORTANT NOTEPlease be advised that Daido steel shall not be held responsible for damage caused bymisunderstanding or improper use of the technical information contained in this brochure.The contents ofthis brochure may be subject to change without notice.Please inquire of related department for the latest information.No portion of this brochure may be reproduced without the express permission of Daido Steel.