Elevated temperature mechanical properties for stainless steels specified in BS EN 10028-7

Introduction

Mechanical (tensile) properties are specified for pressure vessel applications in BS EN 10028-7. These are minimum design values only and do not represent typical values.
Proof strength values only are specified for a small number of ferritic, martensitic and duplex grades. There is a more extensive range of data for austenitic grades, which specifies 0.2% and 1.0% proof strengths and tensile (UTS) values.
The values are shown in N/mm2 (MPa).

The data given is not intended to replace that shown in individual standards to which reference should always be made.

Ferritic, martensitic and duplex proof strengths

The values assume the steels are in the annealed condition, except for the martensitic grades, which are assumed to be in the quenched and tempered (QT) condition. The duplex data is reference data only, according to the standard.

Steel number Minimum 0.2% proof strength (N/mm2) at temperature (°C)
. 100°C 150°C 200°C 250°C 300°C 350°C
Ferritic
1.4003 240 235 230 220 215 .
1.4516 300 270 250 245 225 215
1.4510 195 190 185 175 165 155
1.4521 250 240 230 220 210 205
1.4520 195 180 170 160 155 .
1.4509 230 220 210 205 200 180
Martensitic
1.4313 590 575 560 545 530 515
1.4418 660 640 620 600 580 .
Duplex
1.4362 330 300 280 265  . .
1.4462 360 335 315 300 . .
1.4507 450 420 400 380 . .
1.4410 450 420 400 380 . .
1.4501 450 420 400 380 . .

 

Tensile Strength Values for Duplex (Austenitic Ferritic Stainless Steels) (Preliminary Reference Data

Steel number Minimum Tensile Strength (N/mm2) at temperature (°C)
  100 150 200 250
1.4362 540 520 500 490
1.4462 590 570 550 540
1.4507 660 640 640 630
1.4410 680 660 640 630
1.4501 680 660  640  630 

Austenitic proof strengths and tensile (UTS) values

The values assume the steels are in the annealed condition. The table shown here only has some of the more popular grades. The standard should consulted for the full range of grades and properties. The '0.2%' is the 0.2% proof strength or Rp0.2 value. Similarly '1.0%' is the 1.0% proof strength or Rp1.0. The 'UTS' (ultimate tensile strength) is also known as just 'tensile strength' or Rm.

Steel No. . Minimum tensile values (N/mm2) at temperature (°C)
. . 100 150 200 250 300 350 400 450 500 550
1.4307 0.2% 147 132 118 108 100 94 89 85 81 80
1.0% 181 162 147 137 127 121 116 112 109 108
UTS 410 380 360 350 340 340 . . . .
1.4301 0.2% 157 142 127 118 110 104 98 95 92 90
1.0% 191 172 157 145 135 129 125 122 120 120
UTS 450 420 400 390 380 380 380 370 360 330
1.4311 0.2% 205 175 157 145 136 130 125 121 119 118
1.0% 240 210 187 175 167 161 156 152 149 147
UTS 490 460 430 420 410 410 . . . .
1.4541 0.2% 176 167 157 147 136 130 125 121 119 118
1.0% 208 196 186 177 167 161 156 152 149 147
UTS 440 410 390 385 375 375 375 370 360 330
1.4550 0.2% 177 167 157 147 136 130 125 121 119 118
1.0% 211 196 186 177 167 161 156 152 149 147
UTS 435 400 370 350 340 335 330 320 310 300
1.4404 0.2% 166 152 137 127 118 113 108 103 100 98
1.0% 199 181 167 157 145 139 135 130 128 127
UTS 430 410 390 385 380 380 380 . 360 .
1.4406 0.2% 211 185 167 155 145 140 135 131 128 127
1.0% 246 218 198 183 175 169 164 160 158 157
UTS 520 490 460 450 440 435 . . . .
1.4401 0.2% 177 162 147 137 127 120 115 112 110 108
1.0% 211 191 177 167 156 150 144 141 139 137
UTS 430 410 390 385 380 380 . . . .
1.4571 0.2% 185 177 167 157 145 140 135 131 129 127
1.0% 218 206 196 186 175 169 164 160 158 157
UTS 440 410 390 385 375 375 375 370 360 330
1.4539 0.2% 205 190 175 160 145 135 125 115 110 105
1.0% 235 220 205 190 175 165 155 145 140 135
UTS 500 480 460 450 440 435 . . . .
1.4547 0.2% 230 205 190 180 170 165 160 153 148 .
1.0% 270 245 225 212 200 195 190 184 180 .
UTS 615 587 560 542 525 517 510 502 495 .

  

Heat treatment guidelines

The prior heat treated condition that the elevated temperature values apply to in the BSEN 10028-7 standard are tabulated below. All ferritic, duplex and austenitic grades can be either air or water cooled from the annealing / solution annealing temperature. Martensitics can be cooled from the 'quenching' (austenitising) treatment by either oil, air or water. The standard does not stipulate the cooling method from the second heat treatment (tempering) temperature for the martensitics.

Grade Temperature (°C)
Ferritic
1.4003 700-750
1.4516 790-850
1.4510 770-830
1.4521 820-880
1.4520 820-880
1.4509 870-930
Duplex
1.4362 1000 +/- 50
1.4462 1060 +/- 40
1.4507 1080 +/- 40
1.4410 1080 +/- 40
1.4510 1080 +/- 40
Austenitic
1.4307 1000-1100
1.4301 1000-1100
1.4311 1000-1100
1.4541 1000-1100
1.4550 1020-1120
1.4404 1030-1110
1.4406 1030-1110
1.4401 1030-1110
1.4571 1030-1110
1.4539 1060-1140
1.4547 1140-1200
Martensitic
1.4313 950-1050 OQ,AC,WQ + 560-640
1.4418 900-1000 OQ,AC,WQ + 570-650

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