Assab Steels HOTVAR Hot Work Steel

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Assab Steels HOTVAR Hot Work Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Hot Work Steel
Material Notes:	HOTVAR is a high performance molybdenum-vanadium alloyed hot-work tool steel which is characterized by: High hot wear resistance Very good high temperature properties High resistance to thermal fatigue Very good temper resistance Very good thermal conductivity Applications: Warm forging, dies and punches Roll forging, rolling segments Rock orbital forging, punches and dies Upset forging, clamping tools Progressive forging, dies Axial closed die rolling, top and bottom dies Cross forming, segments Hot bending, tools Hot calibration, tools Zinc die casting, dies Al-tube extrusion
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Physical Properties	Original Value	Comments

Density	0.281 lb/in³
	0.274 lb/in³ @Temperature 600 °C
	0.277 lb/in³ @Temperature 400 °C

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	52	600°C tempering temperature (2 + 2hours). Austenitizing temperature 1050°C
	54	600°C tempering temperature (2 + 2hours). Austenitizing temperature 1070°C
	58	550°C tempering temperature (2 + 2hours). Austenitizing temperature 1070°C
	58	550°C tempering temperature (2 + 2hours). Austenitizing temperature 1050°C
	31 @Temperature 650 °C	Initial hardness after tempering 58. Testing temperature 650°C. Holding time 100 hours
	31 @Temperature 650 °C	Initial hardness after tempering 56. Testing temperature 650°C. Holding time 100 hours
	31 @Temperature 650 °C	Initial hardness after tempering 54. Testing temperature 650°C. Holding time 100 hours
	39 @Temperature 600 °C	Initial hardness after tempering 58. Testing temperature 600°C. Holding time 100 hours
	39 @Temperature 600 °C	Initial hardness after tempering 54. Testing temperature 600°C. Holding time 100 hours
	39 @Temperature 650 °C	Initial hardness after tempering 54. Testing temperature 650°C. Holding time 10 hours
	39 @Temperature 650 °C	Initial hardness after tempering 56. Testing temperature 650°C. Holding time 10 hours
	39 @Temperature 650 °C	Initial hardness after tempering 58. Testing temperature 650°C. Holding time 10 hours
	39 @Temperature 600 °C	Initial hardness after tempering 56. Testing temperature 600°C. Holding time 100 hours
	50 @Temperature 650 °C	Initial hardness after tempering 54. Testing temperature 650°C. Holding time 1 hour
	51 @Temperature 550 °C	Initial hardness after tempering 54. Testing temperature 550°C. Holding time 100 hours
	51 @Temperature 550 °C	Initial hardness after tempering 56. Testing temperature 550°C. Holding time 100 hours
	51 @Temperature 550 °C	Initial hardness after tempering 58. Testing temperature 550°C. Holding time 100 hours
	52 @Temperature 650 °C	Initial hardness after tempering 56. Testing temperature 650°C. Holding time 1 hour
	52 @Temperature 600 °C	Initial hardness after tempering 54. Testing temperature 600°C. Holding time 10 hours
	52 @Temperature 600 °C	Initial hardness after tempering 56. Testing temperature 600°C. Holding time 10 hours
	52 @Temperature 600 °C	Initial hardness after tempering 58. Testing temperature 600°C. Holding time 10 hours
	52 @Temperature 650 °C	Initial hardness after tempering 58. Testing temperature 650°C. Holding time 1 hour
	53 @Temperature 600 °C	Initial hardness after tempering 54. Testing temperature 600°C. Holding time 1 hour
	54 @Temperature 550 °C	Initial hardness after tempering 54. Testing temperature 550°C. Holding time 0-10 hours
	55 @Temperature 600 °C	Initial hardness after tempering 56. Testing temperature 600°C. Holding time 1 hour
	56 @Temperature 600 °C	Initial hardness after tempering 58. Testing temperature 600°C. Holding time 1 hour
	58 - 60 @Diameter 25.4 mm	Hardness before tempering in Air. Austenitizing temperature: 1050°C. Soaking time 30 minutes.
	59.5 @Diameter 25.4 mm	HRC_air. Austenitizing temperature 1050°C
	59 - 61 @Diameter 25.4 mm	Austenitizing temperature: 1070°C. Soaking time 20 minutes.
	60 @Diameter 25.4 mm	HRC_air. Austenitizing temperature 1080°C
	61 @Diameter 25.4 mm	HRC_oil. Austenitizing temperature 1050°C
	60 - 62 @Diameter 25.4 mm	Hardness before tempering in Air. Austenitizing temperature: 1050°C. Soaking time 30 minutes.
	61 - 63 @Diameter 25.4 mm	Austenitizing temperature: 1070°C. Soaking time 20 minutes.
	62 @Diameter 25.4 mm	HRC_oil. Austenitizing temperature 1080°C
Tensile Strength at Break	400 MPa @Temperature 700 °C	R_m
	1900 MPa @Temperature 300 °C	R_m
Tensile Strength, Ultimate	2100 MPa	R_m. 54 HRC.
	2200 MPa	R_m. 56 HRC.
	2300 MPa @Temperature 23.0 °C
Tensile Strength, Yield	1800 MPa	R_p02. 54 HRC.
	1820 MPa	R_p02. 56 HRC.
	250 MPa @Temperature 700 °C	R_p02
	1700 MPa @Temperature 300 °C	R_p02
	1850 MPa @Temperature 23.0 °C
Elongation at Break	13 % @Temperature 300 °C
	25 % @Temperature 700 °C
Reduction of Area	20 % @Temperature 300 °C
	55 % @Temperature 500 °C
	85 % @Temperature 700 °C
Modulus of Elasticity	210 GPa
	140 GPa @Temperature 600 °C
	180 GPa @Temperature 400 °C
Impact Test	12.0 J @Temperature 100 °C	Charpy-V specimens, transverse direction.
	15.5 J @Temperature 300 °C	Charpy-V specimens, transverse direction.

Thermal Properties	Original Value	Comments
CTE, linear	12.6 µm/m-°C @Temperature 20.0 - 400 °C
	13.2 µm/m-°C @Temperature 20.0 - 600 °C
Thermal Conductivity	31.0 W/m-K @Temperature 20.0 °C
	33.0 W/m-K @Temperature 400 °C
	33.0 W/m-K @Temperature 600 °C

Component Elements Properties	Original Value	Comments
Carbon, C	0.55 %
Chromium, Cr	2.6 %
Iron, Fe	91.99 %
Manganese, Mn	0.75 %
Molybdenum, Mo	2.25 %
Silicon, Si	1.0 %
Vanadium, V	0.85 %

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NASSAB17 / 15035

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