Forging:
Heat slowly and uniformly to 1000°C. After forging cool slowly.
Annealing:
Heat slowly to 780°C. Slowly cool in furnace.
Hardening:
Pre heat to 600-700°C until heated through. (Austenitizing temperature 1025°C.) Continue heating to the final hardening temperature of 980-1050°C and allow the component to be heated through. Protect against decarburisation by using neutral salt bath, controlled atmosphere furnace or vacuum. Air cool or quench in oil.
Tempering:
Heat uniformly and thoroughly at the selected tempering temperatures and hold at heat for one hour per inch of total thickness. Double tempering is recommended.
| Tempering °C |
100
|
200
|
300
|
400
|
500
|
600
|
|
HRc
|
56
|
54
|
52
|
54
|
53
|
34
|
Nitriding:
Nitriding of 1.2083 gives it a hard surface which is
ver y resistant to wear and corrosion. Howe
ver , the nitrided surface reduces the corrosion resistance. Surface hardness after nitriding at 525°C in ammonia gas will be approximately 1000HV.
|
Temperature
|
Time
|
Approximate Depth of Case
|
|
525°C
|
20 hours
|
0.20mm
|
|
525°C
|
30 hours
|
0.30mm
|
|
525°C
|
60 hours
|
0.40mm
|
Welding:
Due to the high risk of crack formation welding of 1.2083 stainless steel should be avoided, if possible. When, howe
ver welding is essential, the following serves as a guide:
A. Welding of soft annealed 1.2083 stainless steel.
· Preheat to 300 - 500°C
· Weld at 300-500°C
· Immediately stress relieve
B. Repair welding of 1.2083 stainless steel in hardened and tempered condition.
· Preheat to the tempering temperature (min. 200°C) previously used.
· Start welding at tempering temperature
· Re heat immediately to tempering temperature, but max. 300°C. Soaking time 3 hours.
· Cool in air to approximately 80°C.
· Re heat immediately to tempering temperature, but max. 300°C. Soaking time 3 hours.
Electrode: Hard facing electrode.
| Physical Properties: |
Temperature
|
|
|
| (50 HRc) |
20°C
|
200°C
|
400°C
|
|
Density
|
|
|
|
|
kg/m³
|
7.8
|
7.75
|
7.70
|
|
Coefficient of thermal expansion
|
|
|
|
per °C
|
-
|
11.0 x 10-6
|
11.4 x 10-6
|
|
from 20°
|
|
|
|
|
Thermal conductivity
|
|
|
|
|
cal/cm.s °C
|
54.9 x 10-3
|
57.3 x 10-3
|
59.7 x 10-3
|
|
Modulus of elasticity
|
|
|
|
|
Kp/mm²
|
21 900
|
21 400
|
19 400
|
|
N/mm²
|
215 000
|
210 000
|
190 000
|
|
Specific Heat
|
|
|
|
|
cal/g °C
|
0.110
|
|
|
|
Tensile Strength
|
|
|
|
|
kp/mm²
|
180
|
168
|
158
|
|
N/mm²
|
1 780
|
1 650
|
1 550
|
|
Yield Point
|
|
|
|
|
kp/mm²
|
150
|
139
|
129
|
|
N/mm²
|
1 460
|
1 360
|
1 250
|
|
Reduction of Area
|
|
|
|
|
%
|
30
|
40
|
40
|
|
Elongation
|
|
|
|
|
%
|
10
|
12
|
12
|
