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Bohler-Uddeholm UDDEHOLM HOTVAR® Hot Work Tool Steel

Category Metal , Ferrous Metal , Alloy Steel , Tool Steel , Hot Work Steel
Manufacturer Bohler-Uddeholm
Trade Name UDDEHOLM
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Bohler-Uddeholm UDDEHOLM HOTVAR® Hot Work Tool Steel.pdf
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Material Notes:
Molybdenum-vanadium alloyed steelHotvar® is a premium hot work steel developed by Uddeholm to provide very good performance in tooling up to 1200°F (650°C). The alloying elements in Hotvar® are balanced to give high hot wear resistance and good high temperature properties. Manufactured by special techniques, Hotvar® is suitable for applications where hot wear and/or plastic deformation are the dominating failure mechanisms.Hotvar is characterized by: High hot wear resistance Very good high temperature properties High resistance to thermal fatigue Very good temper resistance Very good thermal conductivityApplications: Uddeholm Hotvar is a hot-work tool steel suitable for applications where hot wear and/or plastic deformation are the dominating failure mechanisms. Applications and tools of especial interest:Warm forging, dies and punchesRoll forging, rolling segmentsRock orbital forging, punches and diesUpset forging, clamping toolsProgressive forging, diesAxial closed die rolling, top and bottom diesCross forming, segmentsHot bending, toolsHot calibration, toolsZinc die casting, diesAl-tube extrusion
Physical Properties Metric English Comments
Density 7.78 g/cc
0.281 lb/in³
hardness of 56 HRC
7.58 g/cc

@Temperature 599 °C
0.274 lb/in³

@Temperature 1110 °F
hardness of 56 HRC
7.67 g/cc

@Temperature 399 °C
0.277 lb/in³

@Temperature 750 °F
hardness of 56 HRC
Mechanical Properties Metric English Comments
Hardness, Brinell 210
210
Soft annealed
Hardness, Rockwell C 54 - 58
54 - 58
Tensile Strength, Ultimate 2100 MPa
305000 psi
hardness of 54 HRC
2210 MPa
320000 psi
hardness of 56 HRC
2310 MPa
335000 psi
hardness of 58 HRC
Tensile Strength, Yield 1790 MPa

@Strain 0.200 %
260000 psi

@Strain 0.200 %
hardness of 52 HRC
1830 MPa

@Strain 0.200 %
265000 psi

@Strain 0.200 %
hardness of 56 HRC
1860 MPa

@Strain 0.200 %
270000 psi

@Strain 0.200 %
hardness of 58 HRC
Modulus of Elasticity 210 GPa
30500 ksi
(hardness of 56 HRC)
140 GPa

@Temperature 599 °C
20300 ksi

@Temperature 1110 °F
hardness of 56 HRC
180 GPa

@Temperature 399 °C
26100 ksi

@Temperature 750 °F
hardness of 56 HRC
Charpy Impact 11.9 J

@Temperature 98.9 °C
8.80 ft-lb

@Temperature 210 °F
V-notch
16.3 J

@Temperature 399 °C
12.0 ft-lb

@Temperature 750 °F
V-notch
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 56 HRC
13.1 µm/m-°C

@Temperature 599 °C
7.30 µin/in-°F

@Temperature 1110 °F
hardened to 56 HRC
Thermal Conductivity 31.0 W/m-K
215 BTU-in/hr-ft²-°F
hardness of 56 HRC
33.0 W/m-K

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

@Temperature 750 °F
hardness of 56 HRC
33.0 W/m-K

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

@Temperature 1110 °F
hardness of 56 HRC
Component Elements Properties Metric English Comments
Carbon, C 0.55 %
0.55 %
Chromium, Cr 2.6 %
2.6 %
Manganese, Mn 0.75 %
0.75 %
Molybdenum, Mo 2.25 %
2.25 %
Silicon, Si 1.0 %
1.0 %
Vanadium, V 0.85 %
0.85 %
Processing Properties Metric English Comments
Processing Temperature 1050 °C
1920 °F
hardening temperature, then quenched in air and tempered 2 + 2 h at 1070°F (hardness = 56 HRC)
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