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EDRO #7 Shock Resistant S7 Tool Steel
Categories: Metal; Ferrous Metal; Chrome-moly Steel; Tool Steel; Shock-Resisting Steel

Material Notes: EDRO #7™ is a chromium-molybdenum steel characterized by: high toughness, good wear resistance, high impact resistance, good through hardening properties, good machinability, and good dimensional stability during hardening.
EDRO #7™ is suitable for plastic molding including injection, compression and transfer molds.
EDRO #7™ has a favorable combination of toughness and wear resistance for heavy duty blanking and forming tools. It is ideally suited for shear blades and cropping tools, both hot and cold. Other applications include rivet punches, chisels, cold heading dies and forging tools.

Information provided by EDRO

Key Words: AISI S 7
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Physical PropertiesOriginal ValueComments
Density 0.278 lb/in³
@Temperature 399 °C
Hardened and tempered to 57 HRC
 0.280 lb/in³
@Temperature 199 °C
Hardened and tempered to 57 HRC
 0.282 lb/in³
@Temperature 20.0 °C
Hardened and tempered to 57 HRC
 
Mechanical PropertiesOriginal ValueComments
Hardness, Brinell 200Delivery condition (soft annealed)
Hardness, Rockwell C 42
@Treatment Temp. 621 °C
Tempered twice for 2 hr at temperature
 50
@Treatment Temp. 538 °C
Tempered twice for 2 hr at temperature
 55
@Treatment Temp. 316 °C
Tempered twice for 2 hr at temperature
 58
@Treatment Temp. 149 °C
Tempered twice for 2 hr at temperature
Hardness, Vickers 850
@Treatment Temp. 570 °C
Tufftride process, 2 hr
 1000
@Treatment Temp. 525 °C
Nitriding in ammonia gas
Tensile Strength, Ultimate 250000 psi45 HRC
 295000 psi50 HRC
 355000 psi55 HRC
 385000 psi58 HRC
Tensile Strength, Yield 200000 psi
@Strain 0.2 %
45 HRC
 240000 psi
@Strain 0.2 %
50 HRC
 295000 psi
@Strain 0.2 %
55 HRC
 300000 psi
@Strain 0.2 %
58 HRC
Modulus of Elasticity 25700 ksi
@Temperature 399 °C
 27800 ksi
@Temperature 199 °C
 28600 ksi
@Temperature 20.0 °C
 
Thermal PropertiesOriginal ValueComments
CTE, linear 6.70 µin/in-°F
@Temperature 20.0 - 199 °C
 6.90 µin/in-°F
@Temperature 20.0 - 399 °C
Specific Heat Capacity 0.110 BTU/lb-°F
@Temperature 20.0 °C
Thermal Conductivity 202 BTU-in/hr-ft²-°F
@Temperature 20.0 °C
 207 BTU-in/hr-ft²-°F
@Temperature 199 °C
 215 BTU-in/hr-ft²-°F
@Temperature 399 °C
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 0.50 %
Chromium, Cr 3.3 %
Iron, Fe 93.7 %As Balance
Manganese, Mn 0.80 %
Molybdenum, Mo 1.4 %
Silicon, Si 0.30 %
 
Descriptive Properties
Color CodeBlack

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