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Buderus Unalloyed Tool Steel 1730 - Buderus Edelstahl GmbH

Buderus Unalloyed Tool Steel 1730 - Buderus Edelstahl GmbH

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l <strong>Buderus</strong> <strong>Unalloyed</strong> <strong>Tool</strong> <strong>Steel</strong> <strong>1730</strong><br />

C Si Mn P S<br />

Typical analysis 0.45 0.30 0.70 0.020 0.005<br />

Chemical composition<br />

as per SEL<br />

0.42–0.50 0.15–0.40 0.60–0.80 � 0.030 � 0.030<br />

Register of European<br />

<strong>Steel</strong>s (SEL)<br />

C 45 U<br />

DIN EN ISO 4957 C 45 U<br />

AFNOR XC 48<br />

AISI SAE 1045<br />

BS C 45 E<br />

Figures in % by mass<br />

Characteristics<br />

<strong>Unalloyed</strong> tool steel with good machinability and weldability, and high toughness. For surface hardening,<br />

the outer layer can be hardened up to 57 HRC.<br />

Applications<br />

Normalised: In mould-making and tool-making for built-on parts, base plates, tool frames with low stress,<br />

and for blow moulds.<br />

Hardened: for blanking dies after stelliting.<br />

Delivered condition<br />

Normalised to max. 190 HB<br />

Physical properties (reference values)<br />

Thermal expansion<br />

coeffi cient (10 –6 /K)<br />

Thermal conductivity<br />

(W/mK)<br />

Young’s modulus<br />

(GPa)<br />

20–100 °C<br />

11.8<br />

20 °C<br />

41.0<br />

20 °C<br />

215<br />

20–250 °C<br />

13.2<br />

250 °C<br />

39.0<br />

250 °C<br />

197<br />

20–500 °C<br />

14.2<br />

500 °C<br />

35.0<br />

500 °C<br />

175<br />

<strong>Buderus</strong> <strong>Edelstahl</strong> <strong>GmbH</strong> l <strong>Steel</strong> Bar Sales l <strong>Buderus</strong>straße 25 l D-35576 Wetzlar<br />

Telephone +49 (0) 64 41-374 2468 l Fax +49 (0) 64 41-374 2784 l info@buderus-steel.com l www.buderus-steel.com<br />

<strong>Buderus</strong> <strong>Unalloyed</strong> <strong>Tool</strong> <strong>Steel</strong> <strong>1730</strong>


l <strong>1730</strong><br />

Heat treatment<br />

Stress relieving Temperature: Approx. 300 °C in the normalised state<br />

Duration: 1 hour per 50 mm wall thickness<br />

Cooling: Furnace<br />

Soft annealing Temperature: 710 °C<br />

Duration: 1 hour per 25 mm wall thickness<br />

Cooling: Furnace<br />

Hardening Temperature: 840 °C<br />

Duration: 30 seconds per mm wall thickness<br />

Quenching hardness Max. 57 HRC in oil or air<br />

Tempering Temperature: See tempering curve<br />

Duration: 1 hour per 25 mm wall thickness<br />

Cooling: Air<br />

Working hardness 46–57 HRC<br />

Tempering curve<br />

Hardness in HRC<br />

64<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 />

0 100 200 300 400 500 600 700 800<br />

TTT curve (continuous)<br />

Temperature in °C<br />

1200<br />

1100<br />

1000<br />

900<br />

800<br />

700 3 10<br />

25<br />

600<br />

500<br />

400<br />

A 80<br />

F 70<br />

P<br />

B<br />

Ms 75<br />

300<br />

200<br />

100<br />

M 2<br />

17<br />

5<br />

548<br />

Average values on samples dia. 25 x 50 mm long<br />

hardened at 840 °C in oil<br />

HB converted from HRC<br />

Tempering temperature in °C<br />

50<br />

50<br />

318 274 274 210<br />

Note: The through-hardening diameter is 15 mm, the hardness penetration depth at 20–100 mm material thickness is 3–5 mm.<br />

HB<br />

(461)<br />

436<br />

413<br />

392<br />

373<br />

354<br />

337<br />

319<br />

0 1 10 10 2 10 3 10 4 10 5 10 6<br />

Seconds<br />

Austenitising temperature: 840 °C<br />

Ac 3<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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