Transcript Die Materials Specification Task Group Conducted by the Die Materials Specification Subcommittee June 12th & 13th, 2007 Die Steel Quality & Heat Treatment Acceptance Criteria.

Die Materials Specification Task Group
Conducted by the
Die Materials Specification
Subcommittee
June 12th & 13th, 2007
Die Steel Quality & Heat Treatment
Acceptance Criteria
Die Materials Specification Task Group
Die Materials Specification Task Group
Die Materials Specification Task Group
TABLE 1 - Chemical Composition of Special Quality Die Steels
NADCA
Grade
Material Category
C
Mn
P
S
Si
Cr
Mo
V
"Grade A"
Type H13 - Premium
0.37 0.42
0.20 0.50
0.025
max
0.005
max
0.80 1.20
5.00 5.50
1.20 1.75
0.80 1.20
"Grade B"
Type H13 - Superior
0.37 0.42
0.20 0.50
0.015
max
0.003
max
0.80 1.20
5.00 5.50
1.20 1.75
0.80 1.00
"Grade C"
Type 2367 & Modified
0.32 0.40
0.10 0.60
0.020
max
0.003
max
0.10 0.50
4.70 5.30
2.00 3.30
0.40 0.70
"Grade D"
Type H11 / 2343
0.35 0.42
0.20 0.60
0.025
max
0.003
max
0.80 1.20
5.00 5.50
1.10 1.60
0.30 0.60
"Grade E"
Type H11 Modified
0.32 0.43
0.10 0.70
0.020
max
0.003
max
0.10 0.55
4.70 5.70
1.10 2.10
0.30 0.80
Die Materials Specification Task Group
Die Materials Specification Task Group
Die Materials Specification Task Group
Die Materials Specification Task Group
H: Banding Segregation:
The annealed microstructure shall be free of excessive banding by conformance with the NADCA Banding Segregation
Reference Chart for levels of microbanding or microchemical segregation. For sizes 4” and below, banding segregation
shall not be cause for rejection unless excessive primary carbides are present.
Die Materials Specification Task Group
Die Materials Specification Task Group
D. Preheating Practice
• Load work into cold furnace and heat at a rate not to exceed 400°F/hour (220°C/hour) as measured by Tc.
• Heat to 1000°F to 1250°F (540°C to 675°C) furnace temperature and hold until Ts-Tc<200°F (110°C).
• Heat to 1550°F ± 50°F (845°C ± 28°C) and hold until Ts - Tc < 100°F (55°C).
• Additional preheating steps may be used at the discretion of the heat treater or toolmaker.
D. Preheating Practice
• Load work into cold furnace and heat at a rate not to exceed 400°F/hour (220°C/hour) as measured by Tc.
• Heat to the 1st designated Preheat temperature in Table 2 and hold until Ts – Tc <200°F (110°C).
• Heat to the 2nd designated Preheat temperature in Table 2 and hold until Ts - Tc < 25°F (14°C).
• Additional preheating steps may be used at the discretion of the heat treater or toolmaker.
Die Materials Specification Task Group
Die Materials Specification Task Group
Die Materials Specification Task Group
TABLE 2 - Heat Treatment Parameters and Impact Toughness
Hardening
Temperature
°F
°C
NADCA
Grade & Type
"Annealed" Steel
Capability CVN*, ft-lbs (J)
Avg
Min
"Class 1" Hardened
Steel CVN**, ft-lbs (J)
Avg
Min
A1885
1885
1030
8 (10.8)
6 (8.1)
na
na
B1885
1885
1030
10 (13.6)
8 (10.8)
8 (10.8)
6 (8.1)
C1885
C1850
1885
1850
1030
1010
10 (13.6)
14 (19)
8 (10.8)
11 (14.9)
8 (10.8)
11 (14.9)
6 (8.1)
9 (12.2)
D1830
1830
1000
14 (19)
11 (14.9)
11 (14.9)
9 (12.2)
E1885
E1850
E1825
E1810
1885
1850
1825
1810
1030
1010
995
990
14 (19)
14 (19)
14 (19)
22 (29.8)
11 (14.9)
11 (14.9)
11 (14.9)
18 (24.4)
11 (14.9)
11 (14.9)
11 (14.9)
18 (24.4)
9 (12.2)
9 (12.2)
9 (12.2)
15 (20.3)
*
Capability toughness after oil quench and minimum double temper
(triple tempered preferred) to 44/46 HRC
**
Toughness of test coupon removed from detail after
commercial vacuum hardening; minimum double tempered
(triple tempered preferred) to 44/46 HRC.
Die Materials Specification Task Group
TABLE 2 - Heat Treatment Parameters and Impact Toughness
Hardening
Temperature
°F
°C
NADCA
Grade & Type
"Annealed" Steel
Capability CVN*, ft-lbs (J)
Avg
Min
"Class 1" Hardened
Steel CVN**, ft-lbs (J)
Avg
Min
A1885
1885
1030
8 (10.8)
6 (8.1)
na
na
B1885
1885
1030
10 (13.6)
8 (10.8)
8 (10.8)
6 (8.1)
C1885
C1850
1885
1850
1030
1010
10 (13.6)
14 (19)
8 (10.8)
11 (14.9)
8 (10.8)
11 (14.9)
6 (8.1)
9 (12.2)
D1830
1830
1000
14 (19)
11 (14.9)
11 (14.9)
9 (12.2)
E1885
E1850
E1825
E1810
1885
1850
1825
1810
1030
1010
995
990
14 (19)
14 (19)
14 (19)
20 (27)
11 (14.9)
11 (14.9)
11 (14.9)
17 (23)
11 (14.9)
11 (14.9)
11 (14.9)
16 (21.7)
9 (12.2)
9 (12.2)
9 (12.2)
14 (19)
*
Capability toughness after oil quench and minimum double temper
(triple tempered preferred) to 44/46 HRC
**
Toughness of test coupon removed from detail after
commercial vacuum hardening; minimum double tempered
(triple tempered preferred) to 44/46 HRC.
Die Materials Specification Task Group
TABLE 2 - Heat Treatment Parameters and Impact Toughness
Preheating
Temperature
°F (°C)
NADCA
Grade & Type
Hardening
Temperature
°F
°C
"Annealed"
Steel Capability CVN*,
ft-lbs (J)
Avg
Min
"Class 1"
Hardened Steel
CVN**, ft-lbs (J)
Avg
Min
A1885
1885
1030
8 (10.8)
6 (8.1)
na
na
B1885
1885
1030
10 (13.6)
8 (10.8)
8 (10.8)
6 (8.1)
C1885
C1850
1885
1850
1030
1010
10 (13.6)
14 (19)
8 (10.8)
11 (14.9)
8 (10.8)
11 (14.9)
6 (8.1)
9 (12.2)
D1830
1830
1000
14 (19)
11 (14.9)
11 (14.9)
9 (12.2)
E1885
E1850
E1825
E1810
1885
1850
1825
1810
1030
1010
995
990
14 (19)
14 (19)
14 (19)
20 (27)
11 (14.9)
11 (14.9)
11 (14.9)
17 (23)
11 (14.9)
11 (14.9)
11 (14.9)
16 (21.7)
9 (12.2)
9 (12.2)
9 (12.2)
14 (19)
*
Capability toughness after oil quench and minimum double
temper (triple tempered preferred) to 44/46 HRC
**
Toughness of test coupon removed from detail after
commercial vacuum hardening; minimum double
tempered (triple tempered preferred) to 44/46 HRC.
Die Materials Specification Task Group
Die Materials Specification Task Group
Die Materials Specification Task Group
Die Materials Specification Task Group
Step Heating
• Load work into cold furnace, and heat at a rate not to exceed 400°F/hr. (220°C/hr.)
• Heat to 1000° F to 1250° F (540°C-675°C)
• Hold until Ts-Tc < 200°F (110°C)
• Heat to 1550° F ± 50°F (845°C ± 28°C )
• Hold until Ts-Tc < 100°F (55°C) heat in “steps” holding
• Alternative preheating steps may be used at the discretion of heat treater or toolmaker.
• Rapidly heat to the designated austenitizing temperature (see Table 2)
• The outside of the tool heats up faster than the inside. This creates stress due to thermal
expansion and phase changes.
• Aim to reach austenitizing temperature with the outside and inside temperatures as close
as possible.
• This can be achieved by heating slowly but it is more efficient to heat in “steps” holding
temperature constant so that equalization can occur.
• Use the heating cycle which gives the least risk and is compatible the equipment
available.
• The most sensitive temperatures are when the temperature reaches the “critical”
temperature of 1560°F (850°C) and close to austenitizing temperature where grain
growth can occur.
Soaking Times
• With inserted thermocouples soak time shall be 30 minutes after Ts-Tc < 25°F (14°C), or 90 minutes maximum after Ts=designated
hardening temperature, whichever occurs first.
Good heating practice means that soaking is more effective. Soaking is performed partly to equalize tool temperature but principally to
dissolve carbides and increase effective alloy content of the matrix. This does not start until close to austenitizing temperatures. Too long a
soak time increases the risk of sagging and can cause grain growth. A more common fault is too little soaking.
Die Materials Specification Task Group
Step Heating
Preheating
• Load work into cold furnace, and heat at a rate not to exceed 400°F/hr. (220°C/hr.)
• Heat to the 1st designated Preheat temperature in Table 2
• Hold until Ts-Tc < 200°F (110°C)
• Heat to the 2nd designated Preheat temperature in Table 2
• Hold until Ts-Tc < 25°F (14°C)
• Alternative preheating steps may be used at the discretion of heat treater or toolmaker.
Austenitizing
• Rapidly heat to the designated austenitizing temperature (see Table 2)
• The outside of the tool heats up faster than the inside. This creates stress due to thermal expansion
and phase changes.
• Aim to reach austenitizing temperature with the outside and inside temperatures as close as
possible.
• This can be achieved by heating slowly but it is more efficient to heat in “steps” holding
temperature constant so that equalization can occur.
• Use the heating cycle which gives the least risk and is compatible the equipment available.
Soaking
• With inserted thermocouples, soak time shall be 30 minutes after Ts-Tc < 25°F (14°C), or 90
minutes maximum after Ts=designated hardening temperature, whichever occurs first.
• Good heating practice means that soaking is more effective. Soaking is performed partly to
equalize tool temperature but principally to dissolve carbides and increase effective alloy content
of the matrix. This does not start until close to austenitizing temperatures. Too long a soak time
increases the risk of sagging and can cause grain growth. A more common fault is too little
soaking.
Die Materials Specification Task Group
Cross Reference Guide to Special Quality Die Steels
NADCA
Grade
Tradename
Type
Hardening Temp,
°F (°C)
A
Type H13 - Premium
A1885
1885 (1030)
B
Type H13 - Superior
B1885
1885 (1030)
C
Type 2367 & Modified
C1850
C1885
C1885
C1885
C1885
1850 (1010)
1885 (1030)
1885 (1030)
1885 (1030)
1885 (1030)
D1830
D1830
D1830
1830 (1000)
1830 (1000)
1830 (1000)
E1810
E1825
E1850
E1850
E1885
E1885
E1885
E1885
1810 (990)
1825 (995)
1850 (1010)
1850 (1010)
1885 (1030)
1885 (1030)
1885 (1030)
1885 (1030)
Uddeholm Dievar
Böhler W403 VMR
Ellwood ExELL Hot Die
Kind RPU
Thyrotherm 2367
D
Type H11 / 2343
Bohler W300 Isobloc
Thyrotherm 2343 Supra
Uddeholm Vidar Supreme
E
Type H11 Modified
Bohler W400 VMR
Uddeholm Vidar Superior
Kind TQ-1
Thyrotherm E38K
Aubert & Duval ADC3
Dunn DSS#3
Ellwood ExELL Tuf-Die
Nippon Koshuha KDA-1
Die Materials Specification Task Group
Cross Reference Guide to Special Quality Die Steels
Hardening Temp,
°F (°C)
NADCA
Grade
Tradename
Type
Preheating Temp, °F (°C)
A
Type H13 - Premium
A1885
1100-1250 (595-675)
1500-1560 (815-850)
1885 (1030)
B
Type H13 - Superior
B1885
1100-1250 (595-675)
1500-1560 (815-850)
1885 (1030)
C
Type 2367 & Modified
Uddeholm Dievar
C1850
1100-1200 (595-650)
1500-1560 (815-850)
1850 (1010)
Böhler W403 VMR
C1885
930-1020 (500-550)
1375-1475 (745-800)
1885 (1030)
Ellwood ExELL Hot Die
C1885
1100-1200 (595-650)
1475-1525 (800-830)
1885 (1030)
Kind RPU
C1885
1100-1200 (595-650)
1500-1560 (815-850)
1885 (1030)
Thyrotherm 2367
C1885
1100-1200 (595-650)
1500-1560 (815-850)
1885 (1030)
Bohler W300 Isobloc
D1830
1100-1200 (595-650)
1500-1560 (815-850)
1830 (1000)
Thyrotherm 2343 Supra
D1830
1100-1200 (595-650)
1500-1560 (815-850)
1830 (1000)
Uddeholm Vidar
Supreme
D1830
1100-1200 (595-650)
1500-1560 (815-850)
1830 (1000)
D
Type H11 / 2343
Die Materials Specification Task Group
Cross Reference Guide to Special Quality Die Steels
NADCA
Grade
Tradename
E
Type H11 Modified
Type
Preheating Temp, °F (°C)
930-1020 (500-550)
1375-1475 (745-800)
1100-1200 (595-650)
1500-1560 (815-850)
1100-1200 (595-650)
1500-1560 (815-850)
1100-1200 (595-650)
1500-1560 (815-850)
Hardening Temp,
°F (°C)
Bohler W400 VMR
E1810
Uddeholm Vidar Superior
E1825
Kind TQ-1
E1850
Thyrotherm E38K
E1850
Aubert & Duval ADC3
E1885 1375-1425 (745-775)
1885 (1030)
Dunn DSS#3
E1885 1275-1325 (690-720)
1885 (1030)
Ellwood ExELL Tuf-Die
E1885
Nippon Koshuha KDA-1
E1885
1100-1200 (595-650)
1450-1500 (790-815)
1100-1200 (595-650)
1475-1525 (800-830)
1810 (990)
1825 (995)
1850 (1010)
1850 (1010)
1885 (1030)
1885 (1030)
Die Materials Specification Task Group
Possible NADCA Sponsored Projects:
• Impact toughness & thermal fatigue resistance of the
new grades listed in #207-2006
• ~$25K - $100K
• Comparative study of heat checking resistance
between Premium Grade H13 with lower bainitic and
martensitic structures
• $25K
• Optimization of the tempering time/temperature
process
•$?