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l <strong>2323</strong> <strong>ISO</strong>-B<br />
Heat treatment<br />
Stress relieving Temperature: Approx. 650 °C in the annealed state<br />
Duration: 1 hour per 50 mm wall thickness<br />
Cooling: Furnace<br />
Soft annealing Temperature: 730 °C<br />
Duration: 1 hour per 25 mm wall thickness<br />
Cooling: Furnace<br />
Hardening Temperature: 950 °C<br />
Duration: 1 minute per mm wall thickness<br />
Quenching hardness Max. 57 HRC in oil, hot bath or vacuum<br />
Tempering Temperature: See tempering curve<br />
Duration: 1 hour per 25 mm wall thickness<br />
Cooling: Air<br />
Working hardness 265–355 HB<br />
Tempering curve<br />
Hardness in HRC<br />
62<br />
60<br />
58<br />
56<br />
54<br />
52<br />
50<br />
48<br />
46<br />
44<br />
42<br />
40<br />
38<br />
36<br />
34<br />
32<br />
30<br />
28<br />
26<br />
0 100 200 300 400 500 600 700 800<br />
Tempering temperature in °C<br />
TTT curve (continuous)<br />
Temperature in °C<br />
1200<br />
1100<br />
1000<br />
900<br />
800<br />
700<br />
600<br />
500<br />
400<br />
300<br />
200<br />
100<br />
M s<br />
M<br />
Retained austenite > 1<br />
767 743 713<br />
Average values on samples dia. 25 x 50 mm long<br />
hardened at 950 °C in oil<br />
HB converted from HRC<br />
1 12 30 55 75<br />
703<br />
25 25<br />
F + C<br />
2<br />
P<br />
20<br />
75<br />
88 87 86 53<br />
� � 10 � � 10<br />
< 1<br />
698 701 599 572 503 457 399 360 215<br />
HB<br />
(461)<br />
436<br />
413<br />
392<br />
373<br />
354<br />
337<br />
319<br />
303<br />
286<br />
0 1 10 10 2 10 3 10 4 10 5 10 6<br />
Seconds<br />
A + C<br />
B<br />
Austenitising temperature: 950 °C<br />
Ac 1e<br />
Ac 1b<br />
1<br />
Minutes<br />
10<br />
Time<br />
100 1000 10 000<br />
Legal notice. <strong>Buderus</strong> <strong>Edelstahl</strong> <strong>GmbH</strong> has taken every possible care in compiling this information; the data is nevertheless subject to intervening changes. <strong>Buderus</strong> <strong>Edelstahl</strong> <strong>GmbH</strong> disclaims all liability and any warranty as regards the accuracy, currency,<br />
correctness and completeness of the information provided. The information provided is merely descriptive and indicative in nature, and binding only when expressly agreed as undertakings in a contract made with <strong>Buderus</strong> <strong>Edelstahl</strong> <strong>GmbH</strong>. <strong>Buderus</strong> <strong>Edelstahl</strong><br />
<strong>GmbH</strong> moreover reserves the right to make changes at any time without prior notice. <strong>Buderus</strong> <strong>Edelstahl</strong> <strong>GmbH</strong> disclaims all liability for loss or damage of any kind, including consequential loss, arising in connection with use of the information provided.<br />
This publication supersedes all previous ones. © <strong>Buderus</strong> <strong>Edelstahl</strong> <strong>GmbH</strong>, Wetzlar, 07/2010
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