Description

DIN:40 CrMnMo 7
AFNOR:40 CMD 8
UNI:35 CrMo 8 KU
AISI:P20
C0.40
Si0.40
Mn1.50
Cr1.90
Mo0.20
STRENGTH:

280 – 325 HB
(≈ 950 – 1100 N/mm²)

THERMAL CONDUCTIVITY AT 100 °C:

35 W/m K


CHARACTER:

alloyed and pre-toughened tool steel, especially suitable for polishing and nitriding; high dimensional stability

APPLICATION:

cavity plates, inserts and high-tensile machine parts


TREATMENT BY

possible:
Etching, EDM

Polishing:
excellent polishing; for higher surface requirements we recommend steel for through hardening

Nitriding:
increases the steel’s wear resistance

Hard chroming:
particularly increases the steel’s wear resistance and corrosion resistance

 


HEAT TREATMENT:

already pre-toughened; usually no heat treatment required

Nitriding:
Before nitriding, stress-relief annealing is recommended at 580 °C. (Meusburger standard)

Hard chroming:
After the hard chroming the mold must be annealed about 3 to 4 hours at 180 °C to avoid brittle fractures from hydrogen.

Hardening:
840 to 860 °C

Cooling:
to 180 °C/220 °C in oil/hot bath, then in air to about 100 °C obtainable hardness: 52 HRC

Tempering:
Slow heating to tempering temperature immediately after hardening. Minimum time in furnace: 1 hour per 25 mm part thickness

Annealing graph:

size chest(in.) waist(in.) hips(in.)
XS 34-36 27-29 34.5-36.5
S 36-38 29-31 36.5-38.5
M 38-40 31-33 38.5-40.5
L 40-42 33-36 40.5-43.5
XL 42-45 36-40 43.5-47.5
XXL 45-48 40-44 47.5-51.5

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