Centerway Steel Co., Ltd
Centerway Steel Co., Ltd
Centerway Steel Co., Ltd
carbon steel plate,steel coil,stainless steel plate,china export service provider.
carbon steel plate,steel coil,stainless steel plate,china export service provider.
Introduction
ASTM A387 specification covers chromium-molybdenum alloy steel plates for welded boilers and pressure vessels manufactured for elevated temperature service. Available steel plate grades are 2, 12, 11, 22, 22L, 21, 21L, 5, 9 and 91. Steel product shall be killed and heat treated. The petrochemical, hydrocarbon processing and coal conversion industries have been utilizing this steel for decades, it varies according to the chromium and molybdenum. Most commonly used are Grade 12, 11, 22, and 5. Further more, these grades are available in 2 strength levels-class1 and class2.
The Chemical Composition remains the same in both Class 1 and Class 2 (Cl1 and Cl2) but the only Difference is in the Mechanical Properties which is mentioned in below Table.
Chemical Composition
|
Chemical Requirements for ASTM A387 Pressure Vessel Plates |
|
||||||||||
|
Elements |
Gr.2 |
Gr.12 |
Gr.11 |
Gr.22 |
Gr.22L |
Gr.21 |
Gr.21L |
Gr.5 |
Gr.9 |
Gr.91 |
|
|
S50460 |
K11757 |
K11789 |
K21590 |
K21590 |
K31545 |
K31545 |
S50200 |
K90941 |
K90901 |
|
|
|
Carbon, max |
0.04-0.21 |
0.04-0.17 |
0.04-0.17 |
0.04-0.15A |
0.12 max |
0.04-0.15A |
0.12 max |
0.15 max |
0.15 max |
0.06-0.15 |
|
|
Manganese |
0.50-0.88 |
0.35-0.73 |
0.35-0.73 |
0.25-0.66 |
0.25-0.66 |
0.25-0.66 |
0.25-0.66 |
0.25-0.66 |
0.25-0.66 |
0.25-0.66 |
|
|
Phosphorous, max |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
|
|
Sulfur, max |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.012 |
|
|
Silicon |
0.13-0.45 |
0.13-0.45 |
0.44-0.86 |
0.50 max |
0.50 max |
0.50 max |
0.50 max |
0.55 max |
1.05 max |
0.18-0.56 |
|
|
Chromium |
0.46-0.85 |
0.74-1.21 |
0.94-1.56 |
1.88-2.62 |
1.88-2.62 |
2.63-3.37 |
2.63-3.37 |
3.90-6.10 |
7.90-10.10 |
7.90-9.60 |
|
|
Molybdenum |
0.40-0.65 |
0.40-0.65 |
0.40-0.70 |
0.85-1.15 |
0.85-1.15 |
0.85-1.15 |
0.85-1.15 |
0.40-0.70 |
0.85-1.15 |
0.80-1.10 |
|
|
Nickel, max |
- |
- |
- |
- |
- |
- |
- |
- |
- |
0.43 |
|
|
Vanadium |
- |
- |
- |
- |
- |
- |
- |
- |
0.05 max |
0.16-0.27 |
|
|
Columbium |
- |
- |
- |
- |
- |
- |
- |
- |
- |
0.05-0.11 |
|
|
Nitrogen |
- |
- |
- |
- |
- |
- |
- |
- |
- |
0.025-0.080 |
|
|
Aluminum, max |
- |
- |
- |
- |
- |
- |
- |
- |
- |
0.02 |
|
|
Titanium, max |
- |
- |
- |
- |
- |
- |
- |
- |
- |
0.01 |
|
|
Zirconium, max |
- |
- |
- |
- |
- |
- |
- |
- |
- |
0.01 |
|
|
1. The carbon content for plates over 5 in. [125 mm] in thickness is 0.17 max on product analysis2. Measured on round test specimens.3. Measured on flat specimen. |
|
||||||||||
Class 1 Plates
|
GRADE |
TENSILE (MPA) |
YIELD (MPA) |
ELONG. (50MM) |
REDUC'N OF AREA* |
|
2, 12 |
380 - 550 |
230 min |
22% min |
- |
|
11 |
415 - 585 |
240 min |
22% min |
- |
|
22, 21, 5, 9 |
415 - 585 |
205 min |
18% min |
40% min |
|
21L, 22L |
415 - 585 |
205 min |
18% min |
40% min |
Class 2 Plates
|
GRADE |
TENSILE (MPA) |
YIELD (MPA) |
ELONG. (50 MM) |
REDUC'N OF AREA* |
|
2 |
485 - 620 |
310 min |
22% min |
- |
|
11 |
515 - 690 |
310 min |
22% min |
- |
|
12 |
450 - 585 |
275 min |
22% min |
- |
|
22, 21, 5, 9 |
515 - 690 |
310 min |
18% min |
40% min |
|
91 |
585 - 760 |
415 min |
18% min |
- |
Mechanical Property
|
Tensile Requirements for ASTM A387 Class 1 Pressure Vessel Plates |
|||
|
|
Grade 2 and 12 |
Grade 11 |
Grade 22, 21, 5, 9, 21L, 22L |
|
Tensile Strength |
55~80 |
60~85 |
60~85 |
|
Yield Strength, min |
33(230) |
35(240) |
30(205) |
|
Elongation in 8 in.[200mm], min, % |
18 |
19 |
- |
|
Elongation in 2 in.[50mm], min, % |
22 |
22 |
18 |
|
Reduction of area, min, % |
- |
- |
45B |
|
Tensile Requirements for ASTM A387 Class 2 Pressure Vessel Plates |
|||||
|
|
Grade 2 |
Grade 11 |
Grade 12 |
Grade 22, 21, 5, 9 |
Grade 91 |
|
Tensile Strength |
70~90 |
75~100 |
65~85 |
75~100 |
85~110 |
|
Yield Strength, min |
45(310) |
45(310) |
40(275) |
45(310) |
60(415) |
|
Elongation in 8 in.[200mm], min, % |
18 |
18 |
19 |
- |
- |
|
Elongation in 2 in.[50mm], min, % |
22 |
22 |
22 |
18 |
18 |
|
Reduction of area, min, % |
- |
- |
|
45B |
- |
Equivalent steel grade
|
BS |
EN |
ASTM/ASME |
DIN |
|
621 B |
––– |
SA387-11-2 |
––– |
|
622-515B |
10 CRMO910 |
SA387-22-2 |
10 CRMO910 |
|
620 B |
13 CRMO 45 |
SA387-12-2 |
13 CRMO 44 |
|
––– |
––– |
SA387-9-2 |
––– |
|
––– |
––– |
SA387-91-2 |
––– |
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