Designation by Standards
|
Brand Name |
Ravne No. |
Mat. No. |
DIN |
EN |
AISI |
|
PT929 |
929 |
1.4922 |
X20CrMoV11-1 |
- |
- |
Chemical Composition in Weight %
|
C |
Si |
Mn |
Cr |
Mo |
Ni |
V |
W |
Others |
|
0.20 |
max. 0.50 |
max. 1.00 |
11.25 |
1.00 |
0.55 |
0.30 |
- |
- |
Description
Steel PT929 is creep-resistant material that is generally used for temperatures up to 650 'C.
Applications
Component parts for steam turbines and other components, resistive to compressed hydrogen for chemical industry. |
Physical properties (avarage values) at ambient temperature:
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.76
Thermal conductivity [W/m.K]: 29.2
Electric resistivity [Ohm mm2/m]: 0.65
Specific heat capacity[J/g.K]: 0.46
Modulus of Elasticity [103 N/mm2]
|
20 'C |
600 'C |
|
210 |
180 |
Coefficient of Linear Thermal Expansion 10-6 oC-1
|
20-100 'C |
20-200 'C |
20-300 'C |
20-400 'C |
20-500 'C |
20-600 'C |
20-700 'C |
20-800 'C |
|
10.7 |
11.1 |
11.5 |
11.5 |
11.8 |
12.2 |
12.3 |
12.5 |
|
Soft Annealing
Heat to 730-780 'C, cool slowly in furnace or air.
Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 650-680 'C, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening
Harden from a temperature of 1020-1070 'C followed by air or oil quenching. Structure is martensite.
Tempering
Tempering temperature: 720-780 'C.
Mechanical Properties at Room Temperature
|
Size range mm |
Heat treatment condition |
0.2 % proof stress (N/mm2) |
Tensile strength (N/mm2) |
Elongation (%) |
Notch impact energy (ISO-V) (J) |
|
d<=100 |
+Q+T |
500 |
700-850 |
16 (Long) 14 (Trans) |
29 (Long) 27 (Trans) |
|
d<=250 |
+Q+T |
500 |
700-850 |
16 (Long) 14 (Trans) |
31 (Long) 27 (Trans) |
|
251-330 |
+Q+T |
500 |
700-850 |
16 (Long) 14 (Trans) |
27 (Long) 27 (Trans) |
0.2 % Proof Stress (N/mm2) at Elevated Temperatures
|
Diameter (mm) |
100 'C |
150 'C |
200 'C |
250 'C |
300 'C |
350 'C |
400 'C |
450 'C |
500 'C |
550 'C |
600 'C |
|
Up to 160 |
460 |
445 |
430 |
415 |
390 |
380 |
360 |
330 |
290 |
250 |
160 |
1 % Creep Limit (N/mm2) vs. Temperature ( 'C)
|
Hours |
480 'C |
500 'C |
520 'C |
540 'C |
560 'C |
|
10 000 |
299 |
247 |
207 |
170 |
135 |
|
100 000 |
236 |
190 |
147 |
114 |
85 |
Creep Rapture Strength (N/mm2) vs. Temperature ( 'C)
|
Hours |
480 'C |
500 'C |
520 'C |
540 'C |
560 'C |
|
10 000 |
345 |
294 |
253 |
213 |
173 |
|
100 000 |
284 |
235 |
186 |
147 |
112 |
|
200 000 |
262 |
215 |
167 |
128 |
96 |
Mechanical Properties vs. Temperature
|
Forging
Hot forming temperature: 1100-850 'C, slow cooling.
Machinability
Metal-cutting machining is the same as for special engineering steel grades of corresponding strength.
