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.