Heat-resistant pressure-vessel steels

Usage

These steel grades are characterised by a minimum yield strength of 235 - 355 MPa and by good weldability. These grades are used above all for manufacturing boilers, pressure vessels and pipes transporting hot liquids. The user of these steel grades must make sure that his calculation, design and processing methods are appropriate for the material. The grades of this series offer good cold and hot-forming properties. 

Standards
Europe
Material no.
D
F
I
GB
E
USA
J
FK1)
EN
10028-2
DIN
17155
NFA 36-205,
36-206
UNI 5869
BS 1501
UNE 36087
ASTM
JIS G 3115
P235GH
1.0345
HI
A 37 CP
FE 360 1KW
161 Gr. 360
A 37 RCI
A 285 Gr. C-A
SPV 24
A
164 Gr. 360
414 Gr. C
A 516 Gr. 55
P265GH
1.0425
HII
A 42 CP
Fe 410 - 1KW
161 Gr. 400
A 42 RCI
A 414 Gr. E
-
A
164 Gr. 400
A 516 Gr. 60
224 Gr. 400
P295GH
1.0481
17 Mn 4
A 48 CP
Fe 460 - 1KW
224 Gr. 490
A 47 RCI
A 414 Gr. F
SPV 32
B
A 516 Gr. 65
P355GH
1.0473
19 Mn 6
A 52 CP
Fe 510 - 1KW
-
A 52 RCI
A 414 Gr. G
SPV 36
B
16Mo3
1.5415
15 Mo 3
15 D3
16 Mo 3
243 B
16 Mo 3
A 204 Gr. B
-
B
13CrMo4-5
1.7335
13 CrMo 4 4
15 CD 4.05
14 CrMo 4 5
620 Gr. 27
14 CrMo 4 5
A 387 Gr. 12
-
B

1) FK = Tensile strength class 

Chemical composition in percent by weight [%] (Heat analysis)
Grade
C
Si
Mn
P
S
N
Altotal
Cr
Ni
Mo
Ti
V
Nb
max.
max.
max.
max.
min.
max.
max.
max.
max.
P235GH1,2)
max. 0,16
0,35
0,603) - 1,20
0,025
0,010
0,0124)

0,020
max. 0,30
0,30
max. 0,08
0,03
0,02
0,020
P265GH1,2)
max. 0,20
0,40
0,803) - 1,40
0,025
0,010
0,0124)

0,020
max. 0,30
0,30
max. 0,08
0,03
0,02
0,020
P295GH1,2

0,08 - 0,20

0,40
0,903) - 1,50
0,025
0,010
0,0124)

0,020
max. 0,30
0,30
max. 0,08
0,03
0,02
0,020
P355GH1,2)
0,10 - 0,22
0,60
1,10 - 1,70
0,025
0,010
0,0123)

0,020
max. 0,30
0,30
max. 0,08
0,03
0,02
0,020
16Mo31)
0,12 - 0,20
0,35
0,40 - 0,90
0,025
0,010
0,012
5)
max. 0,30
0,30
0,25 - 0,35
-
-
-
13CrMo4-51)
0,08 - 0,18
0,35
0,40 - 1,00
0,025
0,010
0,012
5)
0,706) - 1,15
-
0,40 - 0,60
-
-
-

1) Cu ≤ 0,30%. A lower Cu-content and a maximum tin content may be agreed in the order, e. g. with respect to formability.
2) Cr + Cu + Mo + Ni ≤ 0,70%
3) For thicknesses < 6,0 mm, a minimum content for Mn that is 0,20 % smaller than specified is permitted.
4) Al / N ≥ 2
5) The al-content of the melting is to determine and to indicate in the certification
6) If resistance against high-pressure hydrogen is important, a minimum percentage by mass of Cr of 0,80 % may be agreed in the order.

Mechanical properties 1)
Grade
Min. yield strength2)
Tensile strength
Min. total elongation
MPa
MPa
%
e ≤ 16
e > 16
P235GH
235
225
360 - 480
24
P265GH
265
255
410 - 530
22
P295GH
295
290
460 - 580
21
P355GH
355
345
510 - 650
20
16Mo3
275
270
440 - 590
22
13CrMo4-5
300
290
450 - 600
19

1) Transverse samples
2)
e = Norminal thickness in mm

Min. yield point at elevated temperature
Grade
Yield point at elevated temperature Rp0,2 in MPa at a the test temperature °C of1)
50
100
150
200
250
e ≤ 16
e > 16
e ≤ 16
e > 16
e ≤ 16
e > 16
e ≤ 16
e > 16
e ≤ 16
e > 16
P235GH
227
218
214
205
198
190
182
174
167
160
P265GH
256
247
241
232
223
215
205
197
188
181
P295GH
285
280
268
264
249
244
228
225
209
206
P355GH
343
334
323
314
299
291
275
267
252
245
16Mo3
273
268
264
259
250
245
233
228
213
209
13CrMo4-5
294
285
285
275
269
260
252
243
234
226
Grade
Yield point at elevated temperature Rp0,2 in MPa at a the test temperature °C of1)
300
350
400
450
500
e ≤ 16
e > 16
e ≤ 16
e > 16
e ≤ 16
e > 16
e ≤ 16
e > 16
e ≤ 16
e > 16
P235GH
153
147
142
136
133
128
-
-
-
-
P265GH
173
166
160
154
150
145
-
-
-
-
P295GH
192
189
178
175
167
165
-
-
-
-
P355GH
232
225
214
208
202
196
-
-
-
-
16Mo3
194
190
175
172
159
156
147
145
141
139
13CrMo4-5
216
209
200
194
186
180
175
169
164
159

1) e = Nominal thickness in mm

Notch impact energy
Grade
Minimum value of notch impact energy in J at a test temperature in °C of
+20
±0
-20
P235GH
 40
34
 27
P265GH
 40
34
 27
P295GH
 40
34
 27
P355GH
 40
34
 27
16Mo3
 31
 -
  -
13CrMo4-5
 31
 -
  -

1) Average values of 3 samples; one individual value may fall short of the required minimum value by not more than 30 %. The sample width shall equal the product thickness if the latter is between 6 and 10 mm, the tests being performed using samples which are similar to Charpy-V samples.

The values specified in the table above are to be reduced proportionally to the sample width.

Welding

The steel grades of this series may be welded by means of the usual welding techniques. 

Condition of delivery, scope of testing and certificate

The provisions of EN 10028-2, chapters 8.2 and 9 shall apply for delivery and inspection. Steel grades P235GH - P355GH are delivered normalised rolled (delivery condition N). The steel grade 16Mo3 is delivered in the as-rolled condition; the test is carried out on simulating heattreated samples (normalised). Steel grade 13CrMo4-5 is delivered in the as-rolled condition; the test is carried out on simulating heattreated samples (normalised and tempered).

Certificates according to DIN EN 10204 can be supplied as follows: IT, DUN, FAX, e-mail, paper.

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