THYROTHERM E38K - Schmolz + Bickenbach
THYROTHERM E38K - Schmolz + Bickenbach
THYROTHERM E38K - Schmolz + Bickenbach
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<strong>THYROTHERM</strong> ® <strong>E38K</strong><br />
Technical Data Sheet<br />
Chemistry<br />
Typical C Si S Mn Cr Mo V<br />
Analysis % 0.35 0.30 .003 max. 0.30 5.0 1.35 0.45<br />
Description<br />
• <strong>THYROTHERM</strong>® <strong>E38K</strong> is an electro slag remelted (ESR)<br />
modified H-11 die steel, developed for hot working applications<br />
where maximum mechanical strength (toughness) properties are<br />
required.<br />
Characteristics<br />
• Superior toughness<br />
• Excellent hardenability<br />
• Good thermal conductivity<br />
• Good polishability<br />
Applications<br />
• Large high pressure die casting dies<br />
• Large hot forging dies<br />
• Aluminum extrusion tooling<br />
Physical Properties (Hardened and tempered to 46 HRC)<br />
Coefficient of<br />
Thermal<br />
Expansion<br />
Thermal<br />
Conductivity<br />
Density: 0.281 lbs/in 3 (room temperature)<br />
Mechanical Properties<br />
Toughness (CVN): Average 15 ft-lbs. at 44-46 HRC<br />
Tensile Properties: (room temperature)<br />
Hardness<br />
HRC<br />
52<br />
48<br />
44<br />
Polishing<br />
Y.S<br />
(0.2%)<br />
ksi<br />
210<br />
188<br />
169<br />
70 0 F – 200 0 F<br />
6.6 X 10 -6 / 0 F<br />
70 0 F<br />
186 Btu/in/ft 2 /<br />
hr/ 0 F<br />
T.S.<br />
Ksi<br />
263<br />
235<br />
204<br />
70 0 F – 400 0 F<br />
6.9 X 10 -6 / 0 F<br />
650 0 F<br />
189 Btu/in/ft 2 /<br />
hr/ 0 F<br />
EL<br />
(%)<br />
12<br />
13<br />
14<br />
70 0 F – 750 0 F<br />
7.1 X 10 -6 / 0 F<br />
1300 0 F<br />
210 Btu/in/ft 2 /<br />
hr/ 0 F<br />
RA<br />
(%)<br />
For highly cosmetic applications, the tool should be heat treated to the<br />
highest hardness possible. Size of the tool will determine the maximum<br />
hardness. A-1 polish is achievable when proper procedures are<br />
followed. A <strong>Schmolz</strong> & <strong>Bickenbach</strong> representative should be consulted<br />
when determining the hardness.<br />
35<br />
38<br />
50<br />
Heat Treatment<br />
Soft Annealing<br />
Temperature Cooling Hardness<br />
1365 o F - 1435 o F<br />
Stress Relieving<br />
Temperature Cooling Hardness<br />
1200 o F for 2<br />
hours<br />
Hardening (Refer to TTT diagram on page 2)<br />
Temperature Cooling Hardness<br />
1832 o F - 1886 o F<br />
Hold at<br />
temperature for<br />
30 minutes<br />
Tempering (See tempering diagram on page 2)<br />
Temperature<br />
F<br />
572 752 932 1022 1112 1202<br />
Hardness<br />
HRC<br />
51 51 52 50 47 34<br />
• Tempering hardness is approximate and based on two hours at<br />
temperature<br />
• In order to achieve faster quench rates, generous radii and machining<br />
stock should be left on during rough machining.<br />
• Optimal heat treatment parameters should be followed to achieve<br />
maximum potential die life.<br />
• Please contact your <strong>Schmolz</strong> & <strong>Bickenbach</strong> heat treat representative<br />
for more detailed information.<br />
Welding<br />
Furnace 20 o F/hour to 1200 o F<br />
Then air cool.<br />
Cool slowly to 930 o F in air<br />
Vacuum quench at 50 o F/min.<br />
to 1000 o F then cool to below<br />
150 o F<br />
USA 800.323.1233 CANADA 800.268.4977 HEAT TREATMENT 800.265.0862<br />
www.schmolz-bickenbach.us<br />
www.schmolz-bickenbach.ca<br />
170 HB<br />
Max<br />
170 HB<br />
Max<br />
53 HRC<br />
Max<br />
Quenched<br />
• <strong>THYROTHERM</strong>® <strong>E38K</strong> can be welded in an annealed and hardened<br />
condition if machining errors, design changes or minor<br />
cracking have occurred. TIG (Tungsten Inert Gas) should preferably<br />
be used.<br />
Welding Guidelines<br />
Process<br />
Tig/MMA<br />
Current<br />
D.C.<br />
Amperage (A) 100-150<br />
Electrode<br />
Tungsten Thorium<br />
Electrode Diameter 0.10 – 0.17<br />
Protective Gas<br />
Argon Helium<br />
Flow (L/mm) 10<br />
Filler Rod AISI H-11 or H-13<br />
Welding Temperatures<br />
Preheat<br />
Temp.<br />
700 o F to<br />
800 o F<br />
Maintained<br />
Temperature<br />
during<br />
welding<br />
Cool<br />
Down to:<br />
Stress Relieve<br />
Above 600 o F 150 o F 1050 o F for 2 hours
<strong>THYROTHERM</strong> ® <strong>E38K</strong><br />
Technical Data Sheet (cont.)<br />
Time-Temperature-Transformation Diagram.<br />
Austenitizing Temperature 1865 o F<br />
2192<br />
2012<br />
1832<br />
1652<br />
Ac 1e<br />
Temperature °F<br />
1472<br />
1292<br />
1112<br />
932<br />
752<br />
572<br />
A + C<br />
3<br />
M S<br />
10 35<br />
F + C<br />
10 85<br />
B<br />
80<br />
85<br />
Ac 1b<br />
100 100 100 12<br />
392<br />
M<br />
10<br />
212<br />
Hardness<br />
1 2 3 4 5 6 7 8 9 10 11<br />
0<br />
10 0 10 1 10 2 10 3 10 4 10 5 10 6<br />
Time (s)<br />
10 0 10 1 10 2 10 3 10 4<br />
Time (min)<br />
10 0 10 1 10 2<br />
Time (Hr)<br />
Cooling Curve Number 1 2 3 4 5 6 7 8 9 10 11<br />
Hardness (HV 10) 657 633 627 620 620 572 483 433 270 197 184<br />
Hardness (HRc approx.) 60 59 58.5 58 58 56 50 46 28 13 9<br />
12<br />
175<br />
7<br />
Tempering Diagram<br />
70<br />
66<br />
62<br />
Industry Standards<br />
<strong>THYROTHERM</strong>® <strong>E38K</strong> meets or exceeds the following<br />
standards:<br />
• NADCA #207-2006<br />
• Ford Motor Company AMTD-DC2010<br />
58<br />
Hardness in HRC<br />
54<br />
50<br />
46<br />
42<br />
38<br />
34<br />
General Notes<br />
All statements regarding the properties or utilization of the<br />
materials or products mentioned are for the purposes of<br />
description only. Guarantees regarding the existence of<br />
certain properties or a certain utilization are only valid if<br />
agreed upon in writing.<br />
30<br />
0 212 392 572 752 932 1112 1292 1472<br />
Temperature °F<br />
USA 800.323.1233 CANADA 800.268.4977 HEAT TREATMENT 800.265.0862<br />
www.schmolz-bickenbach.us<br />
www.schmolz-bickenbach.ca
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