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Bohler-Uddeholm UDDEHOLM DIEVAR® Hot Work Tool Steel

Category Metal , Ferrous Metal , Alloy Steel , Chrome-moly Steel , Tool Steel , Hot Work Steel
Manufacturer Bohler-Uddeholm
Trade Name UDDEHOLM
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Bohler-Uddeholm UDDEHOLM DIEVAR® Hot Work Tool Steel.pdf
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Material Notes:
Description: Uddeholm Dievar is a high performance chromium-molybdenum-vanadium alloyed hot work tool steel which offers a very good resistance to heat checking, gross cracking, hot wear and plastic deformation.Dievar is characterized by: Excellent toughness and ductility in all directions Good temper resistance Good high temperature strength Excellent hardenability Good dimensional stability throughout heat treatment and coating operationsApplications: Heat checking is one of the most common failure mechanism e.g. in die casting and now days also in forging applications. Uddeholm Dievar’s superior ductility yields the highest possible level of heat checking resistance. With Uddeholm Dievar’s outstanding toughness and hardenability the resistance to heat checking can further be improved. If gross cracking is not a factor then a higher working hardness can be utilized (+2 HRC). Regardless of the dominant failure mechanism; e.g. heat checking, gross cracking, hot wear or plastic deformation. Uddeholm Dievar offers the potential for significant improvements in die life and then resulting in better tooling economy. Uddeholm Dievar is the material of choice for the high demand die casting-, forging- and extrusion industries.
Physical Properties Metric English Comments
Density 7.78 g/cc
0.281 lb/in³
hardness of 45 HRC
7.58 g/cc

@Temperature 599 °C
0.274 lb/in³

@Temperature 1110 °F
hardness of 45 HRC
7.67 g/cc

@Temperature 399 °C
0.277 lb/in³

@Temperature 750 °F
hardness of 45 HRC
Mechanical Properties Metric English Comments
Hardness, Brinell 160
160
Soft annealed
Tensile Strength, Ultimate 1480 MPa
214000 psi
hardness of 44 HRC
1630 MPa
237000 psi
hardness of 48 HRC
1900 MPa
275000 psi
hardness of 52 HRC
Tensile Strength, Yield 1210 MPa

@Strain 0.200 %
175000 psi

@Strain 0.200 %
hardness of 44 HRC
1380 MPa

@Strain 0.200 %
200000 psi

@Strain 0.200 %
hardness of 48 HRC
1560 MPa

@Strain 0.200 %
226000 psi

@Strain 0.200 %
hardness of 52 HRC
Elongation at Break 12.5 %
12.5 %
hardness of 52 HRC
13 %
13 %
hardness of 44 HRC
13 %
13 %
hardness of 48 HRC
Reduction of Area 52 %
52 %
hardness of 52 HRC
55 %
55 %
hardness of 44 HRC
55 %
55 %
hardness of 48 HRC
Modulus of Elasticity 210 GPa
30500 ksi
(hardness of 45 HRC)
145 GPa

@Temperature 599 °C
21000 ksi

@Temperature 1110 °F
hardness of 45 HRC
180 GPa

@Temperature 399 °C
26100 ksi

@Temperature 750 °F
hardness of 45 HRC
Thermal Properties Metric English Comments
CTE, linear 12.6 µm/m-°C

@Temperature 399 °C
7.00 µin/in-°F

@Temperature 750 °F
hardness of 45 HRC
13.1 µm/m-°C

@Temperature 599 °C
7.30 µin/in-°F

@Temperature 1110 °F
hardened to 45 HRC
Thermal Conductivity 31.0 W/m-K

@Temperature 399 °C
215 BTU-in/hr-ft²-°F

@Temperature 750 °F
hardness of 45 HRC
32.0 W/m-K

@Temperature 599 °C
222 BTU-in/hr-ft²-°F

@Temperature 1110 °F
hardness of 45 HRC
Component Elements Properties Metric English Comments
Carbon, C 0.35 %
0.35 %
Chromium, Cr 5.0 %
5.0 %
Manganese, Mn 0.50 %
0.50 %
Molybdenum, Mo 2.3 %
2.3 %
Silicon, Si 0.20 %
0.20 %
Vanadium, V 0.60 %
0.60 %
Processing Properties Metric English Comments
Processing Temperature 1024 °C
1875 °F
hardening temperature, then quenched in oil and tempered twice at 1160°F for 2 hrs (hardness = 45 HRC)
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