Heat-resistant pressure-vessel steels

Usage

These steel grades are characterized 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. DE FR IT GB ES US JP FK1)
EN 10028-2 DIN 17155 2) 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 19Mn 6 A 52 CP Fe 510 - 1KW - A 52 RCI A414 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, see dimensions
  2. invalid standard

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 0.030
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 0.030
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 0.030
P355GH1,2) 0,10 - 0,22 0.60 1,10 - 1,70 0.025 0.010 0,0124) 0.020 max. 0,30 0.30 max. 0,08 0.03 0.02 0.040
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 properties1)

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 = nominal 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 normalized rolled (delivery condition N). The steel grade 16Mo3 is delivered in the as-rolled condition; the test is carried out on simulating heat-treated samples (normalized). Steel grade 13CrMo4-5 is delivered in the as-rolled condition; the test is carried out on simulating heat-treated samples (normalized and tempered).

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