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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
    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
    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 (T25)
    55
    55
    60
    -
    -
    65
    12Ni4 (25<T40)
    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 (T25)
    35
    40
    45
    45
    45
    45
    12Ni4 (25<T40)
    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
    EN10253-2 elbow 90D Type B, 219.1x6.3, Grade 12Ni4

    Related: Mechanical properties of EN 10253-2 pipe fittings(Tensile/Yield/Elongation).

    Views: 11624  Author:METALS INDUSTRIAL  Date:2015/12/14