» Products » ASME SA-387/ ASTM A387 Gr. 11 Pressure Vessel Plates

ASME SA-387/ ASTM A387 Gr. 11 Pressure Vessel Plates

The ASME SA-387/ ASTM A387 Gr.11 Class 2 plates, supplied to a power plant in Croatia.

  • Description

The pressure vessel plates made of ASTM A387 Grade 11 (identical with ASME SA-387 Gr. 11) are chromium-molybdenum alloy steel plates intended primarily for welded boilers and pressure vessels designed for elevated temperature service. There are two classes available according to tensile strength levels: Class 1 and Class 2. The ASME SA-387/ ASTM A387 Gr.11 steel has the nominal composition of 1.25Cr-0.5Mo-Si with UNS designation number of K11789 and P number of 4.

Manufacture & Heat Treatment

The ASME SA-387/ ASTM A387 Gr.11 plates shall be made by a killed process. Three types of heat treatment may be furnished: (1) annealing; (2) normalizing and tempering; (3) when permitted by the purchaser, quenching and tempering. The tempering temperature shall be no less than 620°C [1150°C]. The “quenching” means accelerated cooling from the austenitizing temperature by air blasting or liquid quenching.

Chemical Composition Requirements

ElementHeat
Analysis
Product
Analysis
C0.05-0.170.04-0.17
Mn0.40-0.650.35-0.73
P≤0.025≤0.025
S≤0.025≤0.025
Si0.50-0.800.44-0.86
Cr1.00-1.500.94-1.56
Mo0.45-0.650.40-0.70
*All composition values are in %.

Tensile Requirements

ASME SA-387/ ASTM A387
Grade 11 Class 1
Tensile Strength
MPa [ksi]
415-585
[60-85]
Yield Strength
MPa [ksi], min.
240
[35]
Elongation in
8", min. %
19
Elongation in
2", min. %
22
Reduction of
area, min. %
-
*Class 1 plates of ASTM A387 Gr. 11 may be furnished in all types of heat treatment.

ASME SA-387/ ASTM A387
Grade 11 Class 2
Tensile Strength
MPa [ksi]
450-585
[65-85]
Yield Strength
MPa [ksi], min.
275
[40]
Elongation in
8", min. %
19
Elongation in
2", min. %
22
Reduction of
area, min. %
-
*Class 2 plates of ASTM A387 Gr. 11 shall be furnished in heat treatment other than annealing.

ASME Codes Applicability & Maximum Use Temperatures

CodeMaxi. Use Temp.
for Class 1 & 2
I649
III Cl. 2 & 3371
VIII Div. 1649
III-1
Cl. 1 & MC
371
III-3
Cl. TC & SC
371
VIII-2 Cl. 1482
VIII-2649

Both Class 1 and Class 2 of ASME SA-387/ ASTM A387 Gr. 11 plates are permitted for use in ASME Boiler & Pressure Vessel Code Section I, III, and VIII, respectively. The maximum use temperature limits for different Construction Codes are listed in the table above.

Maximum Allowable Stresses

Temp.S
40118
65118
100118
125118
150118
200118
250118
300118
325118
350118
375118
400118
425116
450114
475101
50072.9
52551.7
55036.5
57525.2
60017.6
62512.4
6508.08
*Maximum allowable stress values, S, MPa, for metal temperature, °C, not exceeding. For Class 1 of ASME SA-387 Gr. 11 plates used for Section I; III Cl. 2 & 3; and VIII-1.

Temp.S
40148
65148
100148
125148
150148
200148
250148
300148
325148
350148
375148
400148
425148
450143
475107
50072.9
52552.3
55036.3
57525.2
60017.6
62512.4
6508.08
*Maximum allowable stress values, S, MPa, for metal temperature, °C, not exceeding. For Class 2 of ASME SA-387 Gr. 11 plates used for Section I; III Cl. 2 & 3; and VIII-1.

Temp.S
40161
65153
100148
125144
150141
175138
200136
225134
250131
275129
300127
325125
350123
375121
400119
425116
450113
475106
50073.7
52552.0
55036.3
57525.2
60017.6
62512.3
6508.12
*Maximum allowable stress values, S, MPa, for metal temperature, °C, not exceeding. For Class 1 of ASME SA-387 Gr. 11 plates used for Section VIII, Division 2.

Temp.S
40207
65197
100190
125185
150181
175178
200175
225172
250169
275166
300164
325161
350159
375156
400153
425149
450146
475105
50073.7
52552.0
55036.3
57525.2
60017.6
62512.3
6508.12
*Maximum allowable stress values, S, MPa, for metal temperature, °C, not exceeding. For Class 2 of ASME SA-387 Gr. 11 plates used for Section VIII, Division 2.

Design Stress Intensity

Temp.Sm
40138
65138
100138
125138
150138
200135
250131
300127
325126
350123
375121
400118
425116
450114
475106
50097.1
*Design stress intensity, Sm, MPa, for metal temperature, °C, not exceeding. For Class 1 of ASME SA-387 Gr. 11 plates used for Section III-1, Cl. 1 & MC; III-3 Cl. TC & SC; VIII-2, Cl. 1.

Temp.Sm
40172
65172
100172
125172
150172
200172
250169
300164
325161
350158
375155
400153
425149
450142
475119
50091.4
*Design stress intensity, Sm, MPa, for metal temperature, °C, not exceeding. For Class 2 of ASME SA-387 Gr. 11 plates used for Section III-1, Cl. 1 & MC; III-3 Cl. TC & SC; VIII-2, Cl. 1.

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