Material 1.6587

Case hardening steel

The material 1.6587 is a chromium-nickel-molybdenum alloyed case-hardening steel. 1.6587 is used for highly stressed components. The material achieves a very high core strength and high toughness. A typical field of application is gear construction, for example.

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1.6587

Standards

HDIN / EN US-Standard AFNOR UNI JIS request
18CrNiMo7-6 17CrNiMo6 request

Material Category: Case hardening steel

Applications

The material 1.6587 is used for highly stressed gear parts.
18NiCrMo7-6 is the best-known material for manufacturing gears.

Heat Treatment

Soft annealing (+A) at 650 - 700 C°, cooling in oil or polymer
Carburizing at 880 - 980 C°, cooling in oil or polymer
Core hardening at 830 - 870 C°, cooling in oil or polymer
Case hardening at 780 - 820 C°, cooling in oil or polymer
Draining at 150 - 200 C°, cooling in the air

Weldability

The material 1.6587 is weldable.

Chemical Composition

C % Si % Mn % P % S % Cr % Mo % Ni %
0,15 - 0,21 max 0,40 0,50 - 0,90 max 0,025 max 0,035 1,50 - 1,80 0,25 -0,35 1,40 - 1,70

 

Product Specifications

DIN EN 10084
DIN EN 10277
DIN EN ISO 683-3
DIN EN ISO 683-17

Mechanical Properties

Stabstahl
behandelt auf Härtespanne Härte [HB 30]
<= 150 mm 179 - 229 HB 30
behandelt auf Ferrit-Perlit Gefüge und Härtespanne   Härte [HB 30]
<= 60 mm 179 - 229 HB 30
weichgeglüht Härte [HB 30] <= 229 HB 30
nach Einsatzhärtung, im Kern Streckgrenze (Re) Zugfestigkeit (Rm) Bruchdehnung (A5, 65) Einschnürung (Z) Kerbschlagarbeit
KV (ISO-V/Charpy-V)
<= 11 mm >= 835 N/mm² 1.180 - 1.420 N/mm² >= 7 % >= 30 % >= 41 Joule
<= 30 mm >= 785 N/mm² 1.080 - 1.320 N/mm² >= 8 % >= 35 % >= 41 Joule
<= 63 mm >= 685 N/mm² 980 - 1.270 N/mm² >= 8 % >= 35 %  

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