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Latrobe LSS™ H21 Hot Work Tool Steel (ASTM H21)

Category Metal , Ferrous Metal , Alloy Steel , Tool Steel , Hot Work Steel
Manufacturer Latrobe Steel
Trade Name LSS™
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Latrobe LSS™ H21 Hot Work Tool Steel (ASTM H21).pdf
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Material Notes:
TLS H21 hot work tool steel is a low-carbon, tungsten hot work steel that exhibits excellent resistance to softening at elevated temperature. This grade is intended for elevated-temperature service in which tool operate at dull-red heat. For best results, TLS H21 hot work steel should not be water cooled in service unless the tool design includes a continuous flow of internal water cooling. Spray cooling and thermal shock should be avoided. Tools should be thoroughly preheated before entering service. TLS H21 hot work tool steel is recommended for difficult hot work tooling applications such as brass extrusion tooling, brass die casting dies, hot punches, and forging die inserts.Information Provided by Timken Latrobe Steel.Timken sold Latrobe in December 2006. They are now Latrobe Specialty Steels Co.
Physical Properties Metric English Comments
Specific Gravity 8.19 g/cc
8.19 g/cc
Density 8.19 g/cc
0.296 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell C 50
50
Oil Quenched from 1093°C, 10 minutes
52
52
Oil Quenched from 1177°C, 10 minutes
53
53
Oil Quenched from 1204°C, 10 minutes
Modulus of Elasticity 207 GPa
30000 ksi
Machinability 55 - 60 %
55 - 60 %
1% Carbon Steel
Charpy Impact 2.71 J
2.00 ft-lb
V-Notch; Oil Quenched from 1177°C; 560°C Temper Temperature
12.2 J
9.00 ft-lb
V-Notch; Oil Quenched from 1177°C; 650°C Temper Temperature
12.2 J
9.00 ft-lb
V-Notch; Oil Quenched from 1177°C; 370°C Temper Temperature
Thermal Properties Metric English Comments
CTE, linear 10.96 µm/m-°C

@Temperature 21.0 - 204 °C
6.089 µin/in-°F

@Temperature 69.8 - 399 °F
13.12 µm/m-°C

@Temperature 21.0 - 649 °C
7.289 µin/in-°F

@Temperature 69.8 - 1200 °F
Thermal Conductivity 25.14 W/m-K

@Temperature 27.0 °C
174.5 BTU-in/hr-ft²-°F

@Temperature 80.6 °F
28.91 W/m-K

@Temperature 649 °C
200.6 BTU-in/hr-ft²-°F

@Temperature 1200 °F
29.75 W/m-K

@Temperature 204 °C
206.5 BTU-in/hr-ft²-°F

@Temperature 399 °F
Component Elements Properties Metric English Comments
Carbon, C 0.33 %
0.33 %
Chromium, Cr 3.3 %
3.3 %
Iron, Fe 86.07 %
86.07 %
Manganese, Mn 0.25 %
0.25 %
Silicon, Si 0.45 %
0.45 %
Tungsten, W 9.15 %
9.15 %
Vanadium, V 0.45 %
0.45 %
Chemical Properties Metric English Comments
Critical Temperature 777 °C
1430 °F
Ar3
838 °C
1540 °F
Ar1
854 °C
1570 °F
Ac1
924 °C
1700 °F
Ac3
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