BÖHLER HOT WORK TOOL STEELS-increased performance thanks to higher quality
Smooth production cycles and economically efficient production sequences are hinged to a large extent on the service life of the tools employed.
Many years age, BÖHLER already developed a process for the production of hot work tool steels guaranteeing improved material homogeneity. These steels were introduced into the market under the trade name ISODISC.
Consistent further research & development has led to two different hot work tool steel grades offering excellent toughness properties and service times. They are called ISODISC and ISOBLOC and grant the user prolonged tool life.
ISODISC-for highly stressed hot work tools
is distinguished above all by enhanced toughness in transverse direction from the surface to the mid-radius of bars.
Thanks to a special diffusion annealing treatment the segregation level is reduced, so that the core toughness in transverse direction is considerably improved as compared to conventionally manufactured material. However, the mechanical properties still differ to a certain extent between surface zone and core.
ISOBLOC(ESR)
which undergoes ESR remelting combined with a diffusion annealing treatment and the application of a special annealing technology, features improved- almost isotropic mechanical properties over the entire cross section, i.e. even in the center of large diameter bar.
VMR constitutes our top grade for severely stressed hot work tools.
BÖHLER TOOL STEELS-FOR THE HIGHEST STANDARDS
As the most important producer of tool steels worldwide, BÖHLER concentrates on solving the demanding problems of its customers in tool-making.
One of the main areas of emphasis is tool steel for the pressure die casting industry. It is our goal to offer tool materials to the pressure die casting industry, which fulfill the demands of cost optimisation and increased production.
As a result of our experience and intensive research, BÖHLER is able to constantly improve its hot work tool steels with regards to
homogeneity
degree of purity
toughness
working hardness
This optimised material guarantees
increased heat checking resistance
reduced wear due to heat
reduced hot wear
higher working hardness and therefore
LONGER TOOL LIFE
BÖHLER SPECIALTIES IMPROVE YOUR PERFORMANCE
As a tool manufacturer you expect: economical production of pressure die casting tools through
provision of raw material for minimum machining (tolerance, machining allowance)
easy processing and good mach inability
simple, reliable heat treatment
best dimensional stability during heat treatment
As a die caster you expect:
high and uniform life-times
maximum safety against failure during operation
As a result, many demands are made of the steel, e.g.:
high thermal shock resistance
high hot strength
high retention of hardness
high hot toughness
high hot wear resistance
high thermal conductivity
low sticking tendency
TOP-QUALITY FOR THE HIGHEST EFFICIENCY
BÖHLER hot work tool steels-why? A steel's quality is dependent upon the chemical composition, the melting technology and its heat treatment.
BÖHLER has the most modern melting and processing equipment and can therefore offer tailormade solutions for its customers.
Grade/
BÖHLER
Chemical composition (average values %)
Standards
C
Si
Mn
Cr
Mo
V
Co
DIN
AISI
W300 ISODISC/ISOBLOC
0.38
1.1
0.4
5.0
1.3
0.4
--
1.2343
X38CrMoV5-1
H11
W302 ISODISC/ISOBLOC
0.39
1.1
0.4
5.2
1.4
1.00
--
1.2344
X40CrMoV5-1
~H11
H13
W303 ISODISC/ISOBLOC
0.38
0.4
0.4
5.0
2.8
0.65
--
1.2367
X38CrMoV5-3
--
W320 ISODISC/ISOBLOC
0.31
0.3
0.35
2.9
2.8
0.5
--
1.2365
32CrMoV12-28
~H10
W321 ISODISC/ISOBLOC
0.39
0.3
0.35
2.9
2.8
0.65
2.9
~1.2885
~X32CrMoCoV3-3-3
--
W400VMR
0.36
0.2
0.25
5
1.3
0.45
--
~1.2343
~H11
W403VMR
0.38
0.2
0.25
5
2.8
0.65
--
~1.2367
--
W302ESR
Properties
Hot work tool steel featuring excellent hot tensile properties, high hot wear resistance, adequate toughness and heat checking resistance.
Application
Heavy duty hot work tools and dies, mainly for light alloy processing; mandrels, dies, and containers for metal tube and rod extrusion; hot extrusion equipment; tools and dies for the manufacture of hollow bodies, screws, rivets, nuts and bolts.
Die casting equipment, forming dies, die inserts, hot shear blades, and plastic moulding dies.
Heat treatment information
Heat treatment
Stress relieving
600 to 650°C/ Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After thorough heating, hold in neutral atmosphere for 1-2 hours.
Hardening
1020 to 1080°C
Oil, salt bath(500-550°C), air
Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness: 52-56 HRC in oil or salt bath, 50-54 HRC in air.
Tempering
Slow cooling to tempering temperature immediately after hardening/ time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours/cooling in air. It is recommended to temper at least twice.
A third tempering cycle for the purpose of stress relieving may be advantageous stress relieving may be advantageous
1 st tempering approx. 30°C above maximum secondary hardness.
2 nd tempering to desired working hardness
The tempering chart shows average tempered hardness values.
3 rd for stress relieving at a temperature 30-50°C below highest tempering temperature.
Hot work tool steel featuring excellent hot tensile properties, high retention of hardness, good toughness and resistance to heat checking.
Application
Heavy duty hot work tools and dies, mainly for light alloy processing, mandrels, dies, and containers for metal tube and rod extrusion; hot extrusion equipment; tools and dies for the manufacture of hollow bodies, screws, rivets, nuts and bolts.
Die casting equipment, forming dies, die inserts hot shear blades, and plastic moulding dies.
Heat treatment information
Heat treatment
Stress relieving
600 to 650°C/ Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After thorough heating, hold in neutral atmosphere for 1-2 hours.
Hardening
1030 to 1080°C
Oil, salt bath(500-550°C), air
Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness: 52-56 HRC in oil or salt bath, 50-54 HRC in air.
Tempering
Slow cooling to tempering temperature immediately after hardening/ time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours/cooling in air. It is recommended to temper at least twice.
A third tempering cycle for the purpose of stress relieving may be advantageous stress relieving may be advantageous
1 st tempering approx. 30°C above maximum secondary hardness.
2 nd tempering to desired working hardness
The tempering chart shows average tempered hardness values.
3 rd for stress relieving at a temperature 30-50°C below highest tempering temperature.
Due to the balanced combination of a modified chemical composition and an optimised processing route, optimum material properties have been achieved in BÖHLER W400 VMR:
Good macro and microstructure with lowest levels of segregation
Lowest gas contents
Lowest levels of unwanted trace elements
Excellent homogeneity and isotropy
Highest degree of cleanliness
Highest toughness
Best polish ability
Best thermal conductivity
Highest dimensional stability during heat treatment
Good mach inability
Higher working hardness for increased service life (less hot wear, higher hot strength)
Application
Heavy duty hot work tools and dies, mainly for light alloy processing; mandrels, dies, and containers for metal tube and rod extrusion; hot extrusion equipment; tools and dies for the manufacture of hollow bodies, screws, rivets, nuts and bolts.
Die casting equipment, forming dies, die inserts, hot shear blades, and plastic moulding dies.
Heat treatment information
Heat treatment
Stress relieving
600 to650°C/ Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After thorough heating, hold in neutral atmosphere for 1-2 hours.
Hardening
980 to 990°C
Oil, salt bath(500-550°C), air
Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness: 52-54 HRC in oil or salt bath, 50-53 HRC in air.
Tempering
Slow cooling to tempering temperature immediately after hardening/ time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours/cooling in air. It is recommended to temper at least twice.
A third tempering cycle for the purpose of stress relieving may be advantageous stress relieving may be advantageous
1 st tempering approx. 30°C above maximum secondary hardness.
2 nd tempering to desired working hardness
The tempering chart shows average tempered hardness values.
3 rd for stress relieving at a temperature 30-50°C below highest tempering temperature.
Due to the balanced combination of a modified chemical composition and an optimised processing route, optimum material properties have been achieved in BÖHLER W403 VMR:
Good macro and microstructure with lowest levels of segregation
Lowest gas contents
Lowest levels of unwanted trace elements
Excellent homogeneity and isotropy
Highest degree of cleanliness
Highest toughness
Best polish ability
Best thermal conductivity
Highest dimensional stability during heat treatment
Good mach inability
Higher working hardness for increased service life (less hot wear, higher hot strength)
Heat treatment information
Heat treatment
Stress relieving
600 to650°C/ Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After thorough heating, hold in neutral atmosphere for 1-2 hours.
Hardening
1020 to 1030°C
Oil, salt bath(500-550°C), air
Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness: 52-54 HRC in oil or salt bath, 50-53 HRC in air.
Tempering
Slow cooling to tempering temperature immediately after hardening/ time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours/cooling in air. It is recommended to temper at least twice.
A third tempering cycle for the purpose of stress relieving may be advantageous stress relieving may be advantageous
1 st tempering approx. 30°C above maximum secondary hardness.
2 nd tempering to desired working hardness
The tempering chart shows average tempered hardness values.
3 rd for stress relieving at a temperature 30-50°C below highest tempering temperature.