VIDAR™ SUPREME Hot work tool steel - Uddeholm

T OOL STEEL FACTS
VIDAR SUPREME
Hot work tool steel
Wherever tools are made
Wherever tools are used

2
VIDAR
SUPREME
This information is based on our present state of knowledge and is
intended to provide general notes on our products and their uses.
It should not therefore be construed as a warranty of specific
properties of the products described or a warranty for fitness for a
particular purpose.

General
VIDAR SUPREME is a chromium-molybdenumvanadium
alloyed hot work tool steel which is
characterized by:
• High level of resistance to thermal shock and
thermal fatigue
• Good high-temperature strength
• Excellent toughness and ductility in all
directions
• Uniform and high level of machinability
• Excellent through-hardening properties
• Good dimensional stability during hardening.
Typical C Si Mn Cr Mo V
analysis % 0,38 1,0 0,4 5,0 1,3 0,4
Standard AISI H11, B H11, W.-Nr. 1.2343,
specification
Delivery
AFNOR Z38 CDV 5,
UNI X37 CrMoV 51 KU,
UNE X37 CrMoV 5
condition Soft annealed to approx.180 HB
Colour code Orange/red
IMPROVED TOOLING PERFORMANCE
The name “SUPREME” implies that by special
processing techniques and close process control,
the steel attains high purity and a very fine structure.
Further, VIDAR SUPREME shows significant
improvements in isotropic properties compared to
conventionally produced material of the X38 CrMo
V 51 (W.-Nr. 1.2343) type.
These improved isotropic properties are particularly
valuable for tooling subjected to high mechanical
and thermal stresses, e.g. die casting dies and
forging tools. In practical terms, tools may be used
at somewhat higher working hardnesses (2 HRC)
without loss of toughness. Since increased service
hardness limits the formation of heat checking
cracks, improved tool performance can be expected.
Applications
TOOLS FOR DIE CASTING
Tin, lead,
Aluminium-,
Magnesium
zinc alloys alloys
Part HRC HRC
Dies 46–50 42–48
Fixed inserts, cores 48–52 46–50
Sprue parts (ORVAR) (ORVAR)
Nozzles (ORVAR) (ORVAR)
Ejector pins (nitrided)
Plunger, shot-sleeve
(ORVAR) (ORVAR)
(normally nitrided) (ORVAR) (ORVAR)
Austenitizing 990°C 1000°C
temperature (1814°F) (1832°F)
TOOLS FOR HOT PRESSING
VIDAR
SUPREME
Material
Aluminium,
Austenitizing
temperature (approx.) HRC
magnesium 1000°C (1832°F) 44–52
Copper alloys 1000°C (1832°F) 44–52
Steel 1000°C (1832°F) 40–50
OTHER APPLICATIONS
Application
Austenitizing
temperature (approx.) HRC
Severe cold 1000°C (1832°F)
punching, Tempering: 52–54
scarp shears 250°C (482°F)
Shrink rings 1000°C (1832°F)
(e.g. for cemented Tempering:
carbide dies) 575–600°C
(1067–1112°F)
45–50
Wear-resisting 1000°C (1832°F) Core
parts Tempering: 50–52
575°C (1067°F) Surface
+ Nitriding ~1000 HV0,2
3

4
VIDAR
SUPREME
Properties
PHYSICAL DATA
All specimens are taken from the centre of a 500 x
110 mm (19,7" x 4,3") bar. Unless otherwise is indicated
all specimens were hardened from 1000°C
(1832°F), quenched in air and tempered 2 + 2h at
610°C (1130°F). The hardness were 45 ±1 HRC.
Temperature 20°C 400°C 600°C
Density,
(68°F) (750°F) (1010°F)
kg/m3 7 800 7 700 7 600
lbs/in3 Modulus of elasticity
0,281 0,277 0,274
MPa 210 000 180 000 140 000
psi 30,5 x 106 26,1 x 106 20,3 x 106 Coefficient of
thermal expansion
per °C from 20°C – 12,6 x 10 –6 13,2 x 10 –6
per °F from 68°F – 7,0 x 10 –6 7,3 x 10 –6
Thermal
conductivity
W/m °C 25 29 30
Btu in/(ft 2 h°F) 176 204 211
MECHANICAL PROPERTIES
Approximate tensile strength at room temperature.
Hardness 44 HRC
Tensile strength, Rm 1410 MPa 144 kp/mm2 Yield strength, Rp0,2 1170 MPa 119 kp/mm 2
Elongation, A5 12%
Reduction in area, Z 50%
Approximate strength at elevated temperatures
Longitudinal direction.
psi Rm, Rp0.2
1000x MPa
290 2000
261 1800
232 1600
203 1400
174 1200
145 1000
116 800
87 600
58 400
29 200
0
Rp0,2
A5
Rm
A5,
Z %
100
90
80
70
60
50
40
30
20
10
100 200 300 400 500 600 700 °C
210 390 570 750 930 1110 1290 °F
Testing temperature
Z
Effect of time at high temperatures on hardness
Hardness, HRC
50
45
40
35
30
25
20
1 10 100 1000
Time, h
Effect of testing temperatures on impact energy
Charpy V specimens, short transverse direction.
ft. lbs Impact energy, J
74
59
44
30
15
100
80
60
40
20
0
650°C (1202°F)
500°C
(932°F)
550°C (1022°F)
600°C
(1112°F)
45 HRC
100 200 300 400 500 °C
210 390 570 750 930 °F
Testing temperature °C

Heat treatment
SOFT ANNEALING
Protect the steel and heat through to 850°C
(1562°F). Then cool in furnace at 10°C (20°F) per
hour to 650°C (1202°F), then freely in air.
STRESS RELIEVING
After rough machining the tool should be heated
through to 650°C (1202°F), holding time 2 hours.
Cool slowly to 500°C (932°F), then freely in air.
HARDENING
Preheating temperature: 600–850°C (1112–1562°F)
(normally two preheating steps).
Austenitizing temperature: 990–1010°C (1814–
1850°F), normally 990–1000°C (1814–1832°F).
Soaking time: 30–45 minutes. Soaking time = time
at austenitizing temperature after the tool is fully
heated through.
Protect the tool against decarburization and oxidation
during austenitizing.
CCT graph
Austenitizing temperature1000°C (1832°F). Holding time 30 minutes.
°F °C
2000 1100
1800 1000
900
1600
800
1400
700
1200
600
1000
500
800
400
600 300
M
s
400
200
200
100
M
f
Carbides
Martensite
Pearlite
Bainite
1 2 3 4 5 6 7 8
Austenitizing temperature 1000°C (1832°F)
Holding time 30 min.
1 10 100 1000 1 000 10 10 000 100 100 000 Seconds
1 10 100 1000 1 000 Minutes
1 10 100 Hours
Air cooling
Air cooling of
0,2 1,5 10 90 600 bars, of bars,Ø Ø mm mm
0,0079 0,059 0,394 3,54 23,6 inchØ
inch
=
VIDAR
SUPREME
QUENCHING MEDIA
• High speed gas/circulating atmosphere.
• Vacuum (high speed gas with sufficient positive
pressure).
• Martempering bath (salt or fluidized bed) at
500–550°C (932–1022°F).
• Martempering bath (salt or fluidized bed) at
180–220°C (356–428°F).
• Warm oil.
Note 1: Temper the tool as soon as its temperature
reaches 50–70°C (122–158°F).
Note 2: In order to obtain the optimum properties
for the tool, the cooling rate should be fast, but not
at a level that gives excessive distortion or cracks.
A 915°C (1680°F)
C3
A 850°C (1562°F)
C1
Cooling Hardcurve
ness T 800–500
No. HV 10 (sec)
1 715 2
2 715 13
3 695 125
4 654 374
5 642 623
6 642 1248
7 559 5200
8 459 10400
5

6
VIDAR
SUPREME
Hardness, grain size and retained austenite as a
function of austenitizing temperature
Grain size
ASTM Hardness, HRC
Retained austenite %
10 60
58
Hardness
8 56
6
54
52
50
Grain size
4
48
8
2
46
44
Retained austenite
6
4
42
2
Tempering graph
Air cooling of specimen 15 x 15 x 40 mm (0,6" x
0,6" x 1,6")
Hardness, HRC Retained austenite %
58
56
54
52
50
48
46
44
42
40
38
36
34
32
30
28
26
980 990 1000 1010 1020 °C
1796 1814 1832 1850 1868 °F
Austenitizing temperature
TEMPERING
Choose the tempering temperature according to
the hardness required by reference to the tempering
graph below. Temper twice with intermediate
cooling to room temperature. Lowest tempering
temperature 180°C (356°F). Holding time at temperature
minimum 2 hours. To avoid brittleness do
not temper in the range 425–550°C (797–1022°F).
Austenitizing temperature
1000°C (1832°F)
Retained austenite
100 200 300 400 500 600 700 800 °C
212 392 572 752 932 1112 1292 1472 °F
Tempering temperature (2 + 2h)
8
6
4
2
0
Approximate impact strength at different tempering
temperatures.
Charpy V specimens, short transverse direction.
ft.lb.
74
59
44
30
15
Impact strength
- KV Joule
100
80
60
40
20
0
100 200 300 400 500 600 °C
200 400 600 800 1000 1200 °F
Tempering temperature (2h + 2h)
Tempering within the range 425–550°C (797–
1022°F) is normally not recommended due to
impaired toughness.
DIMENSIONAL CHANGES DURING
HARDENING AND TEMPERING
During hardening and tempering the die is exposed
to thermal as well as transformation
stresses. This will inevitably result in dimensional
changes and in the work case distortion. It is therefore
recommended to always leave a machining
allowance after machining before the die is hardened
and tempered. Normally the size in the largest
direction will shrink and the size in the smallest
direction might increase but this is also a matter of
the die size, the die design as well as the cooling
rate after hardening.
For VIDAR SUPREME it is recommended to leave
a machining allowance of 0,2 per cent of the dimension
in length, width and thickness.
NITRIDING AND NITROCARBURIZING
Nitriding and nitrocarburizing result in a hard surface
layer which is very resistant to wear and erosion.
The nitrided layer is, however, brittle and my
crack or spall when exposed to mechanical or thermal
shock, the risk increasing with layer thickness.
Before nitriding, the tool should be hardened
and tempered at a temperature at least 50°C
(120°F) above the nitriding temperature.
Nitriding in ammonia gas at 510°C (950°F) or
plasma nitriding in a 75% hydrogen/25% nitrogen
at 480°C (896°F) both result in a surface hardness
of 1100 HV0,2. In general, plasma nitriding is the
preferred method because of better control over
nitrogen potential; in particular, formation of the
so-called “white layer”, which is not recommended
of hot-work service, can readily be avoided. However,
careful gas nitriding can give perfectly acceptable
results.

VIDAR SUPREME can also be nitrocarburized in
either gas or salt bath. The surface hardness after
nitrocarburizing is 900–1000 HV0,2.
DEPTH OF NITRIDING
Depth
Process Time mm inch
Gas nitriding 10 h 0,12 0,0047
at 510°C (950°F) 30 h 0,20 0,0079
Plasma nitriding 10 h 0,14 0,0055
at 480°C (895°F)
Nitrocarburizing
– in gas at
30 h 0,19 0,0075
580°C (1075°F)
– in salt bath at
2,5 h 0,12 0,0047
580°C (1075°F) 1 h 0,07 0,0028
* Depth of case = distance from surface where hardness
is 50 HV 0,2 over base hardness.
Nitriding to case depths >0,3 mm (0,012") is not
recommended for hot-work applications. VIDAR
SUPREME can also be nitrided in the soft annealed
condition. The hardness and depth of case
will, however, be reduced somewhat in this case.
Cutting data
recommendations
The cutting data below are to be considered as
guiding values which must be adapted to existing
local condition.
DRILLING
High speed steel twist drill
Drill diameter Cutting Feed (f)
speed (vc)
mm inch m/min f.p.m. mm/r i.p.r.
– 5 –3/16 17* 56* 0,08–0,20 0,003–0,008
5–10 3/16–3/8 17* 56* 0,20–0,30 0,008–0,012
10–15 3/8–5/8 17* 56* 0,30–0,35 0,012–0,014
15–20 5/8–3/4 17* 56* 0,35–0,40 0,014–0,016
1) For coated HSS drill vc ~24 m/min. (80 f.p.m.).
Carbide drill
Cutting data Indexable
Type of drill
Solid Brazed
parameters insert carbide carbide1) Cutting
speed (vc)
m/min 180–220 80 60
f.p.m.
Feed (f)
600–735 265 200
mm/r 0,03–0,102) 0,10–0,252) 0,15–0,252) i.p.r. 0,001–0,0042) 0,004–0,012) 0,006–0,012) 1) Drill with internal cooling channels and brazed carbide
tip.
2) Depending on drill diameter.
TURNING
VIDAR
SUPREME
Turning with Turning
carbide with high
Cutting data speed steel
parameters Rough turning Fine turning Fine turning
Cutting
speed (vc)
m/min 150–200 200–250 30
f.p.m.
Feed (f)
500–665 665–835 100
mm/r 0,3–0,6 –0,3 –0,3
i.p.r.
Depth
0,01–0,024 –0,01 –0,01
of cut (ap)
mm 2–6 –2 –2
inch
Carbide
designation
0,08–0,24 –0,08 –0,08
ISO P20–P30 P10 –
Coated carbide Coated carbide
or cermet
MILLING
Face- and square shoulder milling
Milling with Milling
carbide with high
Cutting data speed steel
parameters
Cutting
Rough milling Fine milling Fine milling
speed (vc)
m/min 160–210 210–280 35
f.p.m. 535–700 700–930 115
Feed (fz)
mm/tooth 0,2–0,4 0,1–0,2 0,1
inch/tooth
Depth
0,008–0,016 0,004–0,008 0,004
of cut (ap)
mm 2–5 –2 –2
inch
Carbide
designation
0,08–0,20 –0,08 –0,08
ISO P20–P40 P10–P20 —
Coated Coated
carbide carbide or
cermet
End milling
Cutting data Solid
Type of milling
Carbide
indexable High
parameters
Cutting
carbide insert speed steel
speed (vc)
m/min 70 130–180 351) f.p.m. 235 435–600 1151) Type of milling
Feed (fz)
mm/tooth 0,03–0,20 2) 0,08–0,20 2) 0,05–0,35 2)
inch/tooth 0,001–0,008 2) 0,003–0,008 2) 0,002–0,014 2)
Carbide
designation
ISO K10, P40 P20–P30 –
1) For coated HSS end mill vc ~45 m/min. (150 f.p.m.).
2) Depending on radial depth of cut and cutter diameter.
7

8
VIDAR
SUPREME
GRINDING
A general grinding wheel recommendation is
given below. More information can be found in the
Uddeholm publication “Grinding of Tool Steel”.
Wheel recommendation
Soft annealed Hardened
Type of grinding
Face grinding
condition condition
straight wheel
Face grinding
A 46 HV A 46 GV
segments A 24 GV A 36 GV
Cylindrical grinding A 46 LV A 60 JV
Internal grinding A 46 JV A 60 IV
Profile grinding A 100 LV A 120 JV
Electrical-discharge
machining
If spark-erosion is performed in the hardened and
tempered condition, the white re-cast layer should
be removed mechanically e.g. by grinding or stoning.
The tool should then be given an additional
temper at approx. 25°C (50°F) below the previous
tempering temperature.
Welding
Welding of tool steel can be performed with good
results if proper precautions are taken regarding
elevated temperature, joint preparation, choice of
consumables and welding procedure.
Welding method TIG MMA
Working 325–375°C 325–375°C
temperature (620–710°F)
QRO 90
(620–710°F)
Filler metals
Hardness
TIG-WELD QRO 90 WELD
after welding 50–55 HRC 50–55 HRC
Heat treatment after welding
Hardened Temper at 25°C (50°F) below the
condition original tempering temperature.
Soft annealed Soft-anneal the material at 850°C
condition (1560°F) in protected atmosphere.
Then cool in the furnace at 10°C
(20°F) per hour to 650°C (1200°F)
then freely in air.
More detailed information can be found in the
Uddeholm brochure “Welding of tool steel”.
A die casting die in VIDAR SUPREME.

Hard-chromium
plating
After plating, parts should be tempered at 180°C
(360°F) for 4 hours to avoid the risk of hydrogen
embrittlement.
Photo-etching
VIDAR SUPREME is particularly suitable for
texturing by the photo-etching method. Its high
level of homogeneity and low sulphur content
ensures accurate and consistent pattern reproduction.
Polishing
VIDAR SUPREME exhibits good polishability in
the hardened and tempered condition. Polishing
after grinding can be effected using aluminium
oxide or diamond paste.
Typical procedure:
1. Rough grinding to 180–320 grain size using a
wheel or stone.
2. Fine grinding with abrasive paper or powder
down to 400–800 grain size.
3. Polish with diamond paste grade 15 (15μm grain
size) using a polishing tool of soft wood or fibre.
4. Polish with diamond paste 3 (3μm grain size)
using a polishing tool of soft wood or fibre.
5. When demands on surface finish are high,
grade 1 (1μm grain size) diamond paste can be
used for final polishing with a fibre polishing
pad.
Further information
Please contact your local Uddeholm office for further
information on the selection, heat treatment,
application and availability of Uddeholm tool steels.
VIDAR
SUPREME
9

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66420 San Nicolas de Los Garza, N.L.
Telephone: +52 8-352-5239
Telefax: +52 8-352-5356
Wherever tools are made
Wherever tools are used
ASSAB
ASSAB INTERNATIONAL
Head office
Gustavslundsvägen 151 G
Hus 10, Alvik
Box 413
S-101 28 Stockholm, Sverige
Telephone: +46 8 704 66 70
Telefax: +46 8 25 02 37
Subsidiaries/Branch offices
Argentina, Iran
ASSAB PACIFIC
Head office
ASSAB Pacific Pte. Ltd
171, Chin Swee Road
No. 07-02, San Centre
Singapore 0316
Telephone: +65 534 56 00
Telefax: +65 534 06 55
Subsidiaries
CHINA
ASSAB Tooling (Beijing)Ltd.
Plant 703, No. 3 Yongchang Beilu
BDA., 100076 Beijing, China
Telephone: +86 (0)10 6788 00 21
Telefax: +86 (0)10 6788 00 19
JAPAN
UDDEHOLM KK
Skf Bldg. 7 F
1-9-1, Shiba Daimon
Minato-Ku, Tokyo 105
Telephone: +81 3 547 346 41
Telefax: +81 3 547 376 90
HONG KONG
ASSAB Steels (H.K.) Ltd
Room 1701–1708
Grand Central Plaza, Tower 2
138 Shatin Rural Committee Road
Shatin, N.T. – Hong Kong
Telephone: +852 2487 19 91
Telefax: +852 2489 09 38
KOREA
ASSAB Steels (Korea) Co Ltd
C.P.O. Box 5196
Seoul
Telephone: +82 2 694 38 73
Telefax: +82 2 694 38 75
MALAYSIA
ASSAB Steels (Malaysia) Sdn Bhd
Lot 19, Jalan Perusahaan Dua
Batu Caves Industrial Estate
68100 Batu Caves, Selangor
Telephone: +60 3 689 00 22
Telefax: +60 3 689 00 55
SINGAPORE
ASSAB Steels Singapore (Pte) Ltd
21 Joo Koon Road
Singapore 628979
Telephone: +65 862 22 00
Telefax: +65 862 01 62
TAIWAN
ASSAB Steels (Taiwan) Ltd
(No 112 Wu-Ku Ind. Zone
Wu-kong 1st Road)
P O Box 17-93, Hsin Chuang
Taipei Hsien
Taiwan R O C
Telephone: +886 2 299 28 48
Telefax: +886 2 299 01 47
THAILAND
ASSAB Steels (Thailand) Co Ltd
9/8 Soi Sirichai Apartment
Taeparak Road, K.M. 12
Bangplee
Samutprakarn 10540
Telephone: +66 2 385 59 37
Telefax: +66 2 385 59 43
ASSAB AUSTRALIA
Head office
ASSAB Steels Pty. Ltd.
2 A Cambridge Street
Box Hill, Vic 3128
Melbourne
Telephone: +61 3 899 16 66
Telefax: +61 3 899 06 05
Subsidiaries/Branch offices
Sydney, Adelaide, Newcastle
Perth, Brisbane, Launceston
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