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TOOL STEEL FOR DIE CASTING & HOT STAMPING
DTX1
Doosan Heavy Industries & Construction
DOOSAN HEAVY INDUSTRIES & CONSTRUCTION
TOOL STEEL FOR DIE CASTING & HOT STAMPING DTX1
The ever-faster pace of change necessitates products of ever-higher precision. Doosan has the latest technologies and sufficient experience to produce the advanced tool steel satisfying this need. Moreover, the steady enhancement of the industrial productivity will always bring the satisfaction.
03
TOOL STEEL FOR DIE CASTING & HOT STAMPING DTX1 CONTENTSCharacteristics | 특징
Mechanical properties | 기계적 특성
Thermal properties | 열적 특성
Melt-out property | 용손 반응 특성
Machinability | 기계 가공성
Applications | 적용 사례
04
06
08
09
10
11
DOOSAN TOOL STEELS
DOOSAN HEAVY INDUSTRIES & CONSTRUCTION
1. Higher resistance to catastrophic crack propagation due to excellent toughness 인성이 우수하여 금형의 대형균열 발생 억제
2. Easiness for manufacturing the complex molds due to higher machinability STD 61 대비 기계가공성이 우수하여 금형 제작 용이
3. Good resistance to heat crack with higher thermal conductivity 우수한 열전도율로 내 heat crack 성 우수
4. Extended mold life due to higher resistance to softening 연화 저항성이 우수하여 금형 수명 증대
Toughness인성
High Temp. Strength고온강도
Heat crack resistance내 heat crack 성
Machinability기계가공성
DTX1 ◎ ◯ ◯ ◎
STD61 △ △ △ ◯
Excellent ◎ > ◯ > △ poor
Comparison of Properties | 특성 비교
(Unit: wt.%)
C Mn Cr Mo Si V Others
DTX1 0.35~0.45 <0.50 4.5~5.5 1.0~1.5 adjusted
Chemical Compositions | 화학성분
CHARACTERISTICS | 특징
DOOSAN TOOL STEELS
05
Annealing 1) Quenching Tempering
800~900 °C 1000~1050 °C 550~650 °C
1) Max. hardness(HB) of as annealed material : 229
Heat treatment | 열처리
Time
Tem
pera
ture
(°C)
1200
1000
800
600
400
200
0
1000~1050°C
550~650°C
80~100°C
550~650°C
2nd Preheat(700~800°C)
1st Preheat(500~600°C)
Austenitizing
1st Tempering 2nd Tempering
High Pressuregas cooling
Air cooling Air cooling
STD 61 DTX1
As annealed
Quenching, Tempered
40㎛
40㎛
40㎛
40㎛
Continuous cooling transformation curves | 연속 냉각 변태
Time (sec.)
Tem
pera
ture
(°C)
Quenching Temperature : 1030°C
1000
900
800
700
600
500
400
300
200
100
00.1 1 10 100 1000 10000 100000
100(°C/sec)
Cooling speed
10 0.5
0.2 0.1
0.05 0.02 0.015 1
Pearlite
Bs
Ms
Mf
Bf
■ Heat treatment cycle | 열처리 조건 ■ Micro-structure | 미세 조직
DOOSAN HEAVY INDUSTRIES & CONSTRUCTION
Tensile properties vs. Hardness | 인장특성 vs 경도
Tensile properties vs. Test temperature | 고온인장 특성
Hardness (HRc)
Stre
ngth
(MPa
) Elongation (%)
2200
2000
1800
1600
1400
1200
30
25
20
15
10
5
0
44 46 48 50 52 54 56 58
TSYSEL
Temperature(°C)
Stre
ngth
(MPa
) 1600
1400
1200
1000
800
600
400
200
00 100 200 300 400 500 600 700
TSYS
Hardness st 25°C : 47HRc
Temperature(°C)
EL &
RA
(%)
100
80
60
40
20
00 100 200 300 400 500 600 700
ELRA
Resistance to softening at elevated temp. (650℃) | 고온 연화 저항성
Exposure time at 650°C (hr)
45
40
35
30
25
20
0 10 20 30 40 50
Har
dnes
s (H
Rc)
DTX1STD61
Exposure time at 650°C (hr)
1100
1000
900
800
700
600
500
0 10 20 30 40 50
Com
pres
sive
Str
engt
h (M
Pa)
Compression up to 50%(0.1s-1)
Exposure time at 650°C (hr)
140
120
100
80
60
40
200 10 20 30 40 50
Absr
obed
ene
rgy
(J/cm
2)
2mm U-notch Charpy impact testLongitudinal direction
Quenched & tempered hardness | 소입 & 소려 경도
Tempering temperature(°C)
Har
dnes
s (H
Rc) 60
50
40
30
200 100 200 300 400 500 600 700
Quenching Temp.
1030°C1000°C
950°C
MECHANICAL PROPERTIES | 기계적 특성
DOOSAN TOOL STEELS
07
Fatigue property at room temperature | 피로 특성
■ Low cycle fatigue | 저주기 피로
■ Absorbed energy vs. Temp. | 충격 흡수 에너지 vs. 온도
■ High cycle fatigue | 고주기 피로
■ Impact toughness isotropy | 충격 인성 등방 성 비교
Number of cycles to fracture
Tota
l str
ain
rang
e (%
)
DTX1STD61
1.3
1.2
1.1
1.0
0.9
0.8
0.7103 104 105
Number of cycles to Failure
Appl
ied
Stre
ss (M
Pa)
DTX1STD611000
900
800
700
104 105 108106 107
Charpy impact test | 2U mm notch, 충격 특성
1) Normalizing the absorbed energy of STD61(Longitudinal direction) as to 1
2mm U-notch Charpy impact test(Longitudinal direction)
Test temperature(°C)
Inde
x of
Cha
rpy
impa
ct v
alue
1) 8
7
6
5
4
3
2
1
00 50 100 150 200 250 300
DTX1STD61
Hardness : 45HRc
2mm U-notch Charpy impact test at room temp.
Inde
x of
Cha
rpy
impa
ct v
alue
1)
DTX1 STD61
1.6
1.2
0.8
0.4
0.0
L
L
T
T
L : Longitudinal directionT : Transverse direction
Thermal expansion coefficient 열팽창계수 (x10-6/˚C)
Thermal conductivity열전도 (W/mK) Young's modulus
영율 (GPa)200˚C 400˚C 600˚C 25˚C 200˚C 400˚C 600˚C
DTX1 12.8 13.5 14.2 29.5 31.7 31.9 31.6 216
STD61 11.6 12.5 13.2 24.0 26.5 28.2 28.9 200
Physical properties | 기본 물성
Heat crack property | 열피로 특성
DOOSAN HEAVY INDUSTRIES & CONSTRUCTION
Material소재
Heat crack test 열 피로 시험
Sectional crack shapes after test cycle
열 피로 시험 후 단면 관찰
Maximum crack length최대 균열 깊이
Test condition시험조건
DTX1 66 μm
High frequency (1000 cycles) heating up to 650℃ and cooling.
고주기 열 피로 시험
: 650℃까지 가열 후 냉각,
1000회 반복STD61 100 μm
Sample : 50x50x30, mm1 cycle
35sec14sec
THERMAL PROPERTIES | 열적 특성
Heating Coil
High frequency heating machine
Quenching Machine
Nozzle spraying water
SpecimenSpecimen
Heating Temp. : 600-700℃
Water coolingHeating
100㎛
100㎛
DOOSAN TOOL STEELS
09
MELT-OUT PROPERTY | 용손 반응 특성
Immersion test | 침지 실험
Material소재
Immersion test 침지 시험
Melt-out reaction layer observation 용손 반응 층 관찰
Mean melt-out depth평균 용손 깊이
Test condition시험조건
DTX1 280 μm
Measured with intervals of
1mm distance In molten Al
alloy at 700oC for up to 43hrs
700℃에서 용융 Al 합금에서
43시간 동안 침지 후 1mm
간격으로 측정STD61 400 μm
Graphite Crucible
Specimen
Heater
Thermocouple (k-type)
700±2℃
1 mm distanceThe data taken 10 times
specimen
Sealed by refractory material (super-3000)
4 mm
800㎛
800㎛
DOOSAN HEAVY INDUSTRIES & CONSTRUCTION
Machinability test
MACHINABILITY | 기계 가공성
Material소재
Wear loss마모량
Chip칩
Machining condition가공조건
DTX1 0.2 mm
Rough Machining with CNT- MCT using
Ø63F (R3.0), 4 edge DIJET
DIJET 공구를 사용하여 CNT-MCT 장비로 황삭 가공
Machining time : 6hrs (6시간 동안 가공)
STD61 0.5 mm
■ Product shape for the machining testTool steel (480X290X320 mm3)
⇣
Mold Product
DOOSAN TOOL STEELS
11
Applications for die casting | 다이캐스팅 금형 적용 사례
Applications for hot stamping | 열간 프레스 성형 금형 적용 사례
Mold As assembledProduct
■ Timing chain cover | 타이밍 체인 카바
■ Center piller for car body | 차체용 센타필러
■ Auto transmission housing | 자동 변속기 부품
APPLICATIONS | 적용 사례
Mold As assembledProduct
Doosan Heavy Industries & Construction창원본사 (HEAD OFFICE AND CHANGWON PLANT)
우편번호 642-792 경상남도 창원시 성산구 두산볼보로 22
Mail Code 642-792 22 DoosanVolvo-ro,Seongsan-Gu, Changwon, Gyeongnam KoreaTel. 82-55-278-6114, 7114 Fax. 82-55-264-5551~2
www.doosanheavy.com서울사무소 (SEOUL OFFICE)
우편번호 137-920 서울시 서초구 강남대로 465
Mail Code 137-920 465 Gangnam-daero,Seocho-Gu, Seoul KoreaTel. 82-2-513-6114 Fax. 82-2-513-6200