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EN10253-2 Pipe Fittings: Mechanical Properties at Elevated or Low Temperatures
1. Yield Strength-Temperature correlation for EN 10253-2 pipe fittings
As generally specified in EN 10253-2, carbon steels with addition of deliberate amount of chromium, molybdenum or other alloying elements can be used in elevated temperatures. These carbon steel grades include P235GH, P265GH, P355NH. As listed in below table, all chromium-molybdenum alloy steels covered by EN 10253-2 are applicable to high temperature service. In the view of metallurgical structure, chromium(Cr) addition improves resistance to high-temperature hydrogen attack and graphitization while molybdenum(Mo) significantly increases high temperature strength as well as resistance to creep corrosion. These Cr-Mo steel grades are very similar to those steel grades stipulated by ASTM A335 alloy steel seamless pipes Grade P5, P5, P11, P22, P1, P91, P92 and butt welding pipe fittings of ASTM A234 WP5, WP11, WP22, WP12, WP91, WP911, etc. For low temperature services, charpy test is required to obtain the impact properties of the designated steel grade at certain temperatures.
 |
| EN10253-2 90° & 45° Elbow 16Mo3 DN500 W.T=80mm |
(1-1) Minimum yield strength(proof strength) at elevated temperatures.
|
Steel Grade
|
Minimum Yield Strength (MPa) at temperature of (°C)
|
||||||||||
|
100
|
150
|
200
|
250
|
300
|
350
|
400
|
450
|
500
|
550
|
600
|
|
|
P235GH
|
198
|
187
|
170
|
150
|
132
|
120
|
112
|
108
|
-
|
-
|
-
|
|
P265GH
|
226
|
213
|
192
|
171
|
154
|
141
|
134
|
128
|
-
|
-
|
-
|
|
16Mo3
|
243
|
237
|
224
|
205
|
173
|
159
|
156
|
150
|
146
|
-
|
-
|
|
10CrMo5-5
|
240
|
228
|
219
|
208
|
165
|
156
|
148
|
144
|
143
|
-
|
-
|
|
13CrMo4-5
|
264
|
253
|
245
|
236
|
192
|
182
|
174
|
168
|
166
|
-
|
-
|
|
10CrMo9-10
|
249
|
241
|
234
|
224
|
219
|
212
|
207
|
193
|
180
|
-
|
-
|
|
X11CrMo5+I
|
156
|
150
|
148
|
147
|
145
|
142
|
137
|
129
|
116
|
-
|
-
|
|
X11CrMo5+NT1
|
245
|
237
|
230
|
223
|
216
|
206
|
196
|
181
|
167
|
-
|
-
|
|
X11CrMo5+NT2
|
366
|
350
|
334
|
332
|
309
|
299
|
289
|
280
|
265
|
-
|
-
|
|
X11CrMo9-1+I
|
187
|
186
|
178
|
177
|
175
|
171
|
164
|
153
|
142
|
120
|
-
|
|
X11CrMo9-1+NT
|
363
|
348
|
334
|
330
|
326
|
322
|
316
|
311
|
290
|
235
|
-
|
|
X10CrMoVNb9-1
|
410
|
395
|
380
|
370
|
360
|
350
|
340
|
320
|
300
|
270
|
215
|
(1-2) Minimum yield & tensile strength for P355NH at elevated temperatures.
|
Steel Grade
|
Minimum Yield Strength (MPa) at temperature of (°C)
|
||||||
|
100
|
150
|
200
|
250
|
300
|
350
|
400
|
|
|
P355NH (T≤16)
|
304
|
284
|
255
|
235
|
216
|
196
|
167
|
|
P355NH (16<T≤40)
|
294
|
275
|
255
|
235
|
216
|
196
|
167
|
|
P355NH (40<T≤60)
|
284
|
265
|
245
|
226
|
206
|
186
|
157
|
|
P355NH (60<T≤100)
|
265
|
245
|
226
|
206
|
186
|
167
|
137
|
|
Steel Grade
|
Minimum Tensile Strength (MPa) at temperature of (°C)
|
||||||
|
100
|
150
|
200
|
250
|
300
|
350
|
400
|
|
|
P355NH (T≤30)
|
440
|
430
|
410
|
410
|
410
|
400
|
390
|
|
P355NH (30<T≤50)
|
420
|
410
|
390
|
390
|
390
|
380
|
370
|
|
P355NH (50<T≤80)
|
400
|
390
|
370
|
370
|
370
|
360
|
350
|
|
P355NH (80<T≤100)
|
390
|
380
|
360
|
360
|
360
|
350
|
340
|
*T refers to the wall thickness of the pipe fittings.
*Carbon steel grades of EN10253-2 are not recommended for use at temperatures higher than 400°C.
 |
| EN10253-2 elbow 3D and 2D, thick wall, P355NH |
2. Charpy test (low-temperature impact test) for EN 10253-2 pipe fittings
Since the nickel(Ni) addition drastically improves the fracture toughness and fatigue resistance, EN 10253-2 fittings made of steel grades 12Ni4 and X10Ni9 are ideal piping components for use in low temperature services. They are very similar to ASTM A420 pipe fittings Grade WPL6, WPL9, WPL3 and WPL8.
(2-1) Impact properties for carbon steels and Cr-Mo alloy steels according to EN 10253-2.
|
Steel Grade
|
Minimum Average Absorbed Energy, J
|
Minimum Average Absorbed Energy, J
|
||
|
Longitudinal, at temperature of
|
Transverse, at temperature of
|
|||
|
0 °C
|
20 °C
|
0 °C
|
20 °C
|
|
|
P235TR2
|
40
|
-
|
27
|
-
|
|
P265TR2
|
40
|
-
|
27
|
-
|
|
P235GH
|
40
|
-
|
27
|
-
|
|
P265GH
|
40
|
-
|
27
|
-
|
|
16Mo3
|
-
|
40
|
-
|
27
|
|
10CrMo5-5
|
-
|
40
|
-
|
27
|
|
13CrMo4-5
|
-
|
40
|
-
|
27
|
|
10CrMo9-10
|
-
|
40
|
-
|
27
|
|
X11CrMo5
|
-
|
40
|
-
|
27
|
|
X11CrMo9-1
|
-
|
40
|
-
|
27
|
|
X10CrMoVNb9-1
|
-
|
40
|
-
|
27
|
|
L290NB
|
60
|
-
|
40
|
-
|
|
L360NB
|
60
|
-
|
40
|
-
|
|
L360QB
|
60
|
-
|
40
|
-
|
|
L415NB
|
60
|
-
|
40
|
-
|
|
L415QB
|
60
|
-
|
40
|
-
|
|
L450QB
|
60
|
-
|
40
|
-
|
*Materials mainly used at room temperatures.
(2-1) Impact properties for carbon steels and nickel alloy steels according to EN 10253-2.
|
Steel Grade
|
Minimum Average Absorbed Energy, J
|
|||||
|
Longitudinal, at temperature of
|
||||||
|
-50 °C
|
-40 °C
|
-20 °C
|
-10 °C
|
0 °C
|
20 °C
|
|
|
P335N
|
-
|
-
|
40
|
43
|
47
|
55
|
|
P355NH
|
-
|
-
|
40
|
43
|
47
|
55
|
|
P355NL1
|
-
|
40
|
53
|
60
|
65
|
70
|
|
P215NL
|
-
|
40
|
45
|
-
|
-
|
55
|
|
P265NL
|
-
|
40
|
45
|
-
|
-
|
50
|
|
12Ni4 (T≦25)
|
55
|
55
|
60
|
-
|
-
|
65
|
|
12Ni4 (25<T≦40)
|
50
|
50
|
55
|
-
|
-
|
65
|
|
X10Ni9
|
70
|
70
|
70
|
-
|
-
|
70
|
|
Steel Grade
|
Minimum Average Absorbed Energy, J
|
|||||
|
Transverse, at temperature of
|
||||||
|
-50 °C
|
-40 °C
|
-20 °C
|
-10 °C
|
0 °C
|
20 °C
|
|
|
P335N
|
-
|
-
|
27
|
31
|
35
|
39
|
|
P355NH
|
-
|
-
|
27
|
31
|
35
|
39
|
|
P355NL1
|
-
|
27
|
35
|
39
|
43
|
47
|
|
P215NL
|
-
|
-
|
-
|
-
|
-
|
-
|
|
P265NL
|
-
|
27
|
30
|
-
|
-
|
35
|
|
12Ni4 (T≦25)
|
35
|
40
|
45
|
45
|
45
|
45
|
|
12Ni4 (25<T≦40)
|
30
|
35
|
40
|
40
|
45
|
45
|
|
X10Ni9
|
50
|
50
|
50
|
50
|
50
|
50
|
*Materials for use at low temperatures.
 |
| EN10253-2 elbow 90D Type B, 219.1x6.3, Grade 12Ni4 |
Related: Mechanical properties of EN 10253-2 pipe fittings(Tensile/Yield/Elongation).
Views: Author：hbmetals Date:15/12/14