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Latrobe LSSâ„¢ 420 MQ Plastic Mold Steel (AISI 420)

Category Metal , Ferrous Metal , Stainless Steel , Tool Steel , Mold Steel
Manufacturer Latrobe Steel
Trade Name LSS™
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Latrobe LSSâ„¢ 420 MQ Plastic Mold Steel (AISI 420).pdf
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Material Notes:
TLS 420 MQ is a highly-refined, Mold Quality stainless steel that is engineered to exhibit excellent polishability, good corrosion resistance, and good wear resistance. TLS 420 MQ is melted using an electric-arc furnace, is refined by the argon-oxygendecarburization (AOD) process, and is further enhanced to aerospace quality levels using Vacuum-Arc or Electro-Slag Remelting. These special melting and forging practices result in ultra-high microcleanliness and a homogeneous microstructure. TLS 420 MQ is a good choice of a material for the manufacture of plastic molds that require high hardness for good parting line retention and sealing between colored resins. It also resists attack from the corrosive vapors that are produced during molding of some plastic resins. The corrosion resistance also enhances extended tool storage in humid environments. The high cleanliness and homogeneity make TLS 420 MQ a goodchoice for mold cavities that require photoetching/texturizing or the highest, lens-quality polished finishes. Timken sold Latrobe in December 2006. They are now Latrobe Specialty Steels Co.
Physical Properties Metric English Comments
Specific Gravity 7.75 g/cc
7.75 g/cc
Density 7.75 g/cc
0.280 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell C 52
52
Air Cooled from 982°C, 30 minutes
55.5
55.5
Air Cooled from 1010°C, 30 minutes
56.5
56.5
Air Cooled from 1038°C, 30 minutes
Modulus of Elasticity 200 GPa
29000 ksi
Machinability 55 - 60 %
55 - 60 %
1% Carbon Steel
Izod Impact Unnotched 13.6 J
10.0 ft-lb
Air Cooled from 1010°C; 393°C Temper Temperature
20.3 J
15.0 ft-lb
Air Cooled from 1010°C; 593°C Temper Temperature
Thermal Properties Metric English Comments
CTE, linear 10.2 µm/m-°C

@Temperature 20.0 - 100 °C
5.67 µin/in-°F

@Temperature 68.0 - 212 °F
11.7 µm/m-°C

@Temperature 20.0 - 538 °C
6.50 µin/in-°F

@Temperature 68.0 - 1000 °F
Thermal Conductivity 22.84 W/m-K

@Temperature 20.0 °C
158.5 BTU-in/hr-ft²-°F

@Temperature 68.0 °F
23.93 W/m-K

@Temperature 199 °C
166.1 BTU-in/hr-ft²-°F

@Temperature 390 °F
24.95 W/m-K

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

@Temperature 750 °F
Component Elements Properties Metric English Comments
Carbon, C 0.38 %
0.38 %
Chromium, Cr 13.6 %
13.6 %
Iron, Fe 84.87 %
84.87 %
Manganese, Mn 0.45 %
0.45 %
Silicon, Si 0.40 %
0.40 %
Vanadium, V 0.30 %
0.30 %
Chemical Properties Metric English Comments
Critical Temperature 802 °C
1480 °F
Ac1
863 °C
1590 °F
Ac3
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