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Specialty Compounds RTP Company

EDRO #8 Premium 420 Stainless Mold Steel
Categories: Metal; Ferrous Metal; Stainless Steel; T 400 Series Stainless Steel

Material Notes: EDRO #8™ is a chromium-alloyed stainless tool steel with the following properties: excellent corrosion resistance, superior polishability, good wear resistance, good machinability, and stability in hardening.
EDRO #8™ is recommended for all types of molding tools, its special properties make it particularly suitable for molds with the following demands: corrosion/staining resistance, i.e., for molding of corrosive materials, e.g. PVC, acetates, and for molds subjected to humid working/storage conditions; Wear resistance, i.e., for molding abrasive/filled materials, including injection-molded thermosetting grades - also for molds with exceptionally long production runs, e.g. electrical/electronic parts; disposable cutlery and containers; High surface finish, i.e., for production of optical parts, such as camera and sunglass lenses, and for medical containers, e.g. syringes, analysis phials.
EDRO #8™ is resistant to corrosive attack by water, water vapor, weak organic acids, dilute solutions of nitrates, carbonates and other salts.

Information provided by EDRO

Key Words: AISI 420 improved, W.-Nr 1.2083
Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesMetricEnglishComments
Density  7.67 g/cc
@Temperature 399 °C
0.277 lb/in³
@Temperature 750 °F
Hardened and tempered to 50 HRC
 7.75 g/cc
@Temperature 199 °C
0.280 lb/in³
@Temperature 390 °F
Hardened and tempered to 50 HRC
 7.81 g/cc
@Temperature 20.0 °C
0.282 lb/in³
@Temperature 68.0 °F
Hardened and tempered to 50 HRC
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 215215Delivery condition (soft annealed)
Hardness, Rockwell C  38
@Treatment Temp. 566 °C
38
@Treatment Temp. 1050 °F
Tempered twice for 2 hr at temperature
 50
@Treatment Temp. 482 °C
50
@Treatment Temp. 900 °F
Tempered twice for 2 hr at temperature
 52
@Treatment Temp. 177 °C
52
@Treatment Temp. 350 °F
Tempered twice for 2 hr at temperature
 53
@Treatment Temp. 260 °C
53
@Treatment Temp. 500 °F
Tempered twice for 2 hr at temperature
 55
@Treatment Temp. 399 °C
55
@Treatment Temp. 750 °F
Tempered twice for 2 hr at temperature
 55
@Treatment Temp. 93.3 °C
55
@Treatment Temp. 200 °F
Tempered twice for 2 hr at temperature
Tensile Strength, Ultimate 1420 MPa206000 psi45 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
 1770 MPa256000 psi50 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
 2070 MPa300000 psi55 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
Tensile Strength, Yield 1280 MPa185000 psi45 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
 1470 MPa213000 psi50 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
 1610 MPa234000 psi55 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
Elongation at Yield 8.0 %8.0 %in 2", 55 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
 10 %10 %in 2", 50 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
 12 %12 %in 2", 45 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
Reduction of Area 27 %27 %55 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
 30 %30 %50 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
 40 %40 %45 HRC, Round bar 1" diameter, Hardened in oil from 1880°F and tempered twice
Modulus of Elasticity  190 GPa
@Temperature 399 °C
27500 ksi
@Temperature 750 °F
 210 GPa
@Temperature 199 °C
30400 ksi
@Temperature 390 °F
 214 GPa
@Temperature 20.0 °C
31100 ksi
@Temperature 68.0 °F
Izod Impact  16.3 J
@Treatment Temp. 510 °C
12.0 ft-lb
@Treatment Temp. 950 °F
Tempered for 2 hr
 20.3 J
@Treatment Temp. 371 °C
15.0 ft-lb
@Treatment Temp. 700 °F
Tempered for 2 hr
 20.3 J
@Treatment Temp. 149 °C
15.0 ft-lb
@Treatment Temp. 300 °F
Tempered for 2 hr
 27.1 J
@Treatment Temp. 260 °C
20.0 ft-lb
@Treatment Temp. 500 °F
Tempered for 2 hr
 32.5 J
@Treatment Temp. 649 °C
24.0 ft-lb
@Treatment Temp. 1200 °F
Tempered for 2 hr
 74.6 J
@Treatment Temp. 760 °C
55.0 ft-lb
@Treatment Temp. 1400 °F
Tempered for 2 hr
 
Thermal PropertiesMetricEnglishComments
CTE, linear  11.0 µm/m-°C
@Temperature 20.0 - 199 °C
6.10 µin/in-°F
@Temperature 68.0 - 390 °F
 11.5 µm/m-°C
@Temperature 20.0 - 399 °C
6.40 µin/in-°F
@Temperature 68.0 - 750 °F
Specific Heat Capacity 0.460 J/g-°C
@Temperature 20.0 °C
0.110 BTU/lb-°F
@Temperature 68.0 °F
Thermal Conductivity  22.9 W/m-K
@Temperature 20.0 °C
159 BTU-in/hr-ft²-°F
@Temperature 68.0 °F
 23.9 W/m-K
@Temperature 199 °C
166 BTU-in/hr-ft²-°F
@Temperature 390 °F
 24.9 W/m-K
@Temperature 399 °C
173 BTU-in/hr-ft²-°F
@Temperature 750 °F
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.38 %0.38 %
Chromium, Cr 13.6 %13.6 %
Iron, Fe 84.42 %84.42 %As Balance
Manganese, Mn 0.50 %0.50 %
Silicon, Si 0.80 %0.80 %
Vanadium, V 0.30 %0.30 %
 
Descriptive Properties
Color CodeBrown

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