SpeCial-high-performanCe hot-work tool Steel GSF - Kind & Co ...

SpeCial-high-performance
hot-work tool steel GSF
t h e i n n o vat i v e , h i g h - p e r f o r m a n c e
s t e e l f o r d i e s , f o r m i n g to o l s
a n d m a c h i n e c o m p o n e n t s

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From the casting of
steel to finished die...
LONG-STANDING KNOWLEDGE, INNOVATIVE MATERIALS TECHNOLOGY,
AND ADVANCED EQUIPMENT ALL FORM THE BASIS FOR TOP QUALITY
For over 125 years KIND & CO. Edelstahlwerk
has been developing expertise in producing,
finishing and developing high-alloy steels. Our
experience has manged to extend our services
to a truly global platform, while maintaining our
traditional values.
Customer orientation and quality: these are
the benchmarks for our daily operations using
advanced technology and flexible production as
well as a proven quality management system.
In addition to a broad range of tool steels and
corrosion, acid and heat resistant steels, we offer
a large selection of special steel grades as well
as titanium- and nickel-based alloys. Furthermore,
KIND & CO. has developed specific materials for
various special applications.
Our steels can be found in all major industries
including die casting, plastics, extrusion, pipe engineering,
die forging, power engineering, aviation,
mechanical and apparatus engineering, amongst
others.
Our customers receive everything in one single
package: high quality steel as well as die processing
and finishing services to match their specific
requirements.

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Our flexibility allows us to develop tailored techniques
and processes aligned with your requirements
to help you achieve top performance.
Each one of our global customers is unique. Yet we
are proud to state that they all have one thing in
common: steel by KIND & CO.
This is why we constantly work to further enhance
our high quality and customer-focused service.
We are large enough to serve every customer but
still small enough to find individual solutions.
Do not settle with less than the best.

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GSF – the innovative high-performance steel
for dies, forming tools and machine components
• OUTSTANDING Toughness
• EXCELLENT HEAT RESISTANCE
• HIGH YIELD POINT RATIO
• GOOD Machinabilty
• VERY GOOD THROUGH-HARDENING
CAPABILITY
• READILY TEMPERED TO WORKING
HARDNESS
MATERIAL PROPERTIES
GSF is an innovative high-performance NiCrMoV alloy
steel that was designed for dies, which are used under
forging hammers, or for large-scale dies. GSF represents
an advancement of the 55NiCrMoV7 standard steel
(1.2714) and is distinguished by improved toughness, heat
resistance and weldability.
Due to its outstanding mechanical properties in a
tempered state, GSF is well suited for various dies and
heavy-duty machine components. GSF is an exceptional
alternative to common tempering steels, especially when
it comes to large cross-sections or diameters of up to
650mm and strengths of more than 1000 MPa.
APPLICATION
Typical applications include:
M Hammer forging dies in steel forming, specifically
for deep contours prone to cracking
M Press dies where high toughness and good heat
resistance is required (e.g dies for medium sized
or larger hydraulic presses)
M Calibration and deburring dies for forging presses
M Hammers and press saddles, hammer heads, jaws
in forging machines
M Roughing rolls (forging rolls)
M Dies for the extrusion industry including mandrel
holders, die holders, press columns, piston rods,
return plungers, nuts
M Piercers and piercing sleeves for production of
seamless steel bottles
M Rolling mandrels and tapered rolls in the rolling
technology sector
M Die holders and armoring with strengths of
up to 1450 MPa
M Shafts and heavy-duty machine components with
yield points of 750 > MPa
AS-DELIVERed CONDITION
GSF is usually supplied pre-tempered to 38 - 44 HRc
thus eliminating any additional cost and risk involved with
external heat treatment.
GSF is easily weldable and excellently suited for filler/
overlay welding. Due to the reduced C content, the risk
of cracking in the welding transition zone is limited.
GSF is nitridable.
Material Short name C Si Mn Cr Mo Ni V
PWM 55NiCrMoV7 0.55 0.30 0.80 1.10 0.45 1.70 0.10
GSF
0.28 0.30 0.70 2.80 0.60 1.00 0.40
Handling instructions
Soft annealing 740 - 760 °C
6 – 8 h furnace cooling
Hardness annealed max. 230 HB
Stress relief approx. 630 °C
annealing
slow cooling
Hardening Hardening 920 - 940 °C
in oil, polymer or vacuum hardening
cooling must be interrupted at
150 - 180 °C
Quenched hardness approx. 51 HRC for 60 mm Ø
and oil or polymer quenching
Tempering
400 - 650 °C as needed,
see tempering illustration.
Usually GSF comes tempered
with a hardness of 38 - 44 HRC
Nitriding or
Tenifer treatment
Preheating
of dies
Toughness (Joule)
possible
Comparison of toughness
40
20
GSF
1.2714
0
38
Hardness HRC
100 - 250 °C
is recommended prior to use
GSF
42
1.2714
GSF
44
Fine tempered microstructure for best toughness
1.2714
GSF
46
1.2714

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GSF hammer die with fine engraving,
performance increased by currently 47% compared to 1.2714
Typical application – hammer die
with contour prone to overload

6 Technical data
Tempering diagram 60 mm Ø, 930 °C oil
52
50
48
46
44
42
40
38
High temperature strength diagram
1600
Rp 0.2 and Rm in MPa
1400
1200
1000
800
600
400
200
0
X X X X
20 40 200 300 400 500 600
Temperature °C
X
Rm
Rp 0,2
Z % x 0,1
X
100
80
60
40
20
0
Z in %
Hardness HRC
36
34
32
30
28
400 500 600 700
Tempering temperature °C
TTT-Diagram Austenitizing temperature 930 °C
1200
Mechanical properties at different strength classes
Ø / mm Yield point Tensile Elongation
Applicable Rp 0.2 / MPa Strength A5 / %
Rm / MPa
250 - 500
Physical-mechanical properties of GSF
Temperature °C 20 100 200 300 400 500 600
Thermal conductivity W/(m x K) 31 34 34 34 33 33 31
Coefficient of linear
thermal expansion
10 -6 / K 11.8 11.8 12.0 13.0 13.0 14.0 14.0
Density
7.76 g / cm³
Austenitization: 930 °C 45 min
Notch impact
strength
ISO-V / Joule
min. 950 1300 - 1450 min. 12 min. 25
min. 880 1150 - 1300 min. 14 min. 30
min. 780 1000 - 1150 min. 16 min. 40
1000
A c1e
800
Temperature [°C]
600
A
P 70
λ = 0.06 λ = 0.45 λ = 0.9 λ = 1.8 50.0 25.0 12.5 5.0 2.5 1.25 0.50C/min
A c1e
400
M S
B
200
3
10 15 25 40 100 100 100 100 30
0
584 597 551 564 557 559 557 478 441 429 414 303 Härte [HV]
0,1 1 10 100 1000 10000
Time[min]

filler welded high
performance dies with GSF
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Mass production molds of all types such as dies or
tapered rolls in ring production – specifically for contours
leading to increased wear – call for a combination of high
isotropic hot toughness and maximum hot wear resistance.
Due to the specific material properties and the
reduced C content, GSF makes for an ideal tool steel
for filler welding.
MACHINING
GSF is well suited for machining even in its tempered
state as delivered. Optimal machining parameters may
vary due to material condition, machine, workpiece
clamping, die clamping and machining strategy.
KIND & CO. provides application and project advice
from selection of the right die to a suitable machining
strategy to optimizing process parameters for machining
operations.
Our technical consultants will be happy to provide advice
on the right dies for your machining applications.
Increased performance using Co-based alloy
(Stellite) welded on GSF
1.2714 42-44 HRC
GSF 42-44 HRC,
welded
100%
Good mechanical processing even in tempered condition

Tailored Quality dies for
peak performance
More service
Tool steels and
special materials
Melting
Forging
Ring rolling
Heat treatment
Machining
PRODUcts
Hot work tool steels
Cold work tool steels
Die steels
Plastic mould steels
Surface treatment
Industries
die casting
Die forging
Extrusion
Pipe production
Plastics technology
KIND & CO., Edelstahlwerk, KG
Bielsteiner Str. 124-130 . D-51674 Wiehl-Bielstein
Tel. +49 (0) 22 62 / 84-0 . Fax +49 (0) 22 62 / 84-175
info@kind-co.de . www.kind-co.de
aw.05.13
All information on properties and applications provided in this leaflet are for information only
and cannot be considered to be guaranteed. Guaranteed properties must be specifically agreed.