Assab Steels DF-3 Cold Work Steel

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Assab Steels DF-3 Cold Work Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Cold Work Steel; Oil-Hardening Steel
Material Notes:	DF-3 general purpose oil-hardening tool steel is a versatile manganese-chromium-tungsten steel suitable for a wide variety of cold-work applications. Its main characteristics include: Good machinability Good dimensional stability in hardening A good combination of high surface hardness and toughness after hardening and tempering. These characteristics combine to give a steel suitable for the manufacture of tooling with good tool-life and high production economy. DF-3 can be supplied in various finishes including hot-rolled, pre-machined, fine-machined and precision ground. It is also available in the form of hollow bar. AISI 01
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Physical Properties	Original Value	Comments

Density	0.282 lb/in³
	0.278 lb/in³ @Temperature 400 °C
	0.280 lb/in³ @Temperature 200 °C

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	38.5	790°C Austenitizing temperature, for tempering at 550°C
	42	820°C Austenitizing temperature, for tempering at 550°C
	58	790°C Austenitizing temperature, for tempering at 250°C
	60	820°C Austenitizing temperature, for tempering at 250°C
	62	Hardened and tempered.
	63	780°C hardening temp
	64	At 860°C hardening temp
	64.6	820°C hardening temp
Modulus of Elasticity	190 GPa
	170 GPa @Temperature 400 °C
Compressive Strength	1250 MPa	HRC 45 R_c0.2
	1700 MPa	HRC 45 R_cm
	2050 MPa	HRC 55 R_c0.2
	2250 MPa	HRC 62 R_c0.2
	2450 MPa	HRC 55 R_cm
	3050 MPa	HRC 62 R_cm

Thermal Properties	Original Value	Comments
CTE, linear	11.4 µm/m-°C @Temperature 20.0 - 400 °C
	11.7 µm/m-°C @Temperature 20.0 - 200 °C
Specific Heat Capacity	0.110 BTU/lb-°F @Temperature 20.0 °C
Thermal Conductivity	32.0 W/m-K @Temperature 20.0 °C
	33.0 W/m-K @Temperature 200 °C
	34.0 W/m-K @Temperature 400 °C

Component Elements Properties	Original Value	Comments
Carbon, C	0.90 %
Chromium, Cr	0.85 %
Iron, Fe	96.5 %
Manganese, Mn	1.2 %
Tungsten, W	0.55 %

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NASSAB00 / 15018

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