download - Uddeholm

ELMAX
Heat treatment
SOFT ANNEALING
Protect the steel and heat through to 980°C
(1800°F), holding time 2h. Then cool in furnace
10°C (20°F)/h to 850°C (1560°F). Holding time
10h. Cool slowly to 750°C (1380°F). Then freely
in air.
TEMPERING
Choose the tempering temperature according to
the hardness required by reference to the tempering
graph. Temper twice with intermediate cooling
to room temperature. Lowest tempering temperature
180°C (360°F). Holding time at tempering
temperature minimum 2 hours.
Tempering graph
STRESS-RELIEVING
Hardness, RC Retained austenite %
62
After rough machining the tool should be heated
Austenitizing temperature 1100°C
60
through to 650°C (1200°F), holding time 2 hours.
(2010°F)
1080°C
Cool slowly to 500°C (930°F) then freely in air. 58 (1980°F)
56 1050°C
10
(1920°F)
HARDENING
54
8
Preheating temperature: 600–850°C (1110–1560°F).
52
6
Austenitizing temperature: 1050–1100°C (1920– 50
4
Retained austenite
2010°F), normally 1080°C(1980°F).
48 1050°C (1920°F)
2
46
0
100 200 300 400 500 600 °C
Temperature Holding* Hardness
M f 9 245 6285
time
before
°C °F minutes tempering
210 390 570 750 930 1110 °F
1050 1920 30 60 RC
Tempering temperature, 2 x 2h
1080 1980 30 61 RC
1100 2010 30 62 RC
* Holding time = time at austenitizing temperature after the
tool is fully heated through.
Protect the part against decarburization and
oxidation during hardening.
CCT-graph
Austenitizing temperature 1050°C (1920°F). Holding time 30 minutes.
°F °C
2000 1100
1800 1000
A C1f
1600
900
A C1s
1400
800
Pearlite
700
1200
600
Graph HV T 800–500
1000
No. 10 Kg s
500
1 803 1
800
2 772 10
400
3 724 105
Bainite
600
4 634 576
300
M 5 634 1048
s
400 200
6 536 2095
1 2 3 4 5 6 7 8 9
7 503 3143
200 100
Martensite
8 270 4190
1 10 100 1000 10 000 100 000 Seconds
1 10 100 1000 Minutes
1 10 100 Hours
0.0079 0.059 0.394 3.54 23.6
0.2 1.5 10.0 90.0 600.0
Air cooling of
bars, Ø inch
mm
4