ASTM A387 Pressure Vessel Plate
ASTM A387 steel specification refers to 6 grades of alloy steel plates for high temperature applications, classified according to chromium and molybdenum content, grade 11 and grade 12 are chemically similar and can be used for welded pressure vessels and industrial boilers, mainly used in the oil and gas and petrochemical industries, generally used for the transport of high temperature media. grade 5 and grade 9 plates have alloying elements chromium and molybdenum which have good corrosion and heat resistance which is required by the sour oil and gas industry. The alloying elements chromium and molybdenum in grades 5 and 9 provide good corrosion and heat resistance, which is required by the sour oil and gas industry.
A387 boiler quality plates chemical composition:
| ASTM A387 | Grade 5 | Grade 9 | Grade 11 | Grade 12 | Grade 22 |
| Carbon | 0.15 max | 0.15 max | 0.04 - 0.17 | 0.04 - 0.17 | 0.04 - 0.15 |
| Manganese | 0.25 - 0.66 | 0.25 - 0.66 | 0.35 - 0.73 | 0.35 - 0.73 | 0.25 - 0.66 |
| Phosphorous | 0.035 | 0.030 | 0.035 | 0.035 | 0.035 |
| Sulfur | 0.030 | 0.030 | 0.035 | 0.035 | 0.035 |
| Silicon | 0.55 max | 1.05 max | 0.44 - 0.86 | 0.13 - 0.45 | 0.5 max |
| Chromium | 3.9 - 6.1 | 7.9 - 10.1 | 0.94 - 1.56 | 0.74 - 1.21 | 1.88 - 2.62 |
| Molybdenum | 0.40 - 0.7 | 0.85 - 1.15 | 0.40 - 0.7 | 0.4 - 0.65 | 0.85 - 1.15 |
A387 Boiler Quality Steel Plates Mechanical Property:
| ASTM A387 Mechanical Property | A 387 Grade 5 | A 387 Grade 9 | A 387 Grade 11 | A 387 Grade 12 | A 387 Grade 22 |
| Class1 | Class2 | Class1 | Class2 | Class1 | Class2 | Class1 | Class2 | Class1 | Class2 |
| Tensile strength(ksi) | 60-85 | 75-100 | 60-85 | 75-100 | 60-85 | 70-90 | 50-80 | 65-85 | 60-85 | 75-100 |
| Tensile strength(Mpa) | 415-585 | 515-690 | 415-585 | 515-690 | 415-585 | 485-620 | 380-550 | 450-585 | 415-585 | 515-690 |
| Yield Strength(ksi) | 30 | 45 | 30 | 45 | 35 | 45 | 33 | 40 | 30 | 45 |
| Tensile Strength(Mpa) | 205 | 310 | 205 | 310 | 240 | 310 | 230 | 275 | 205 | 310 |
| Elongation in 200mm(%) | | | | | 19 | 18 | 18 | 19 | | |
| Elongation in 50mm(%) | 18 | 18 | 18 | 18 | 22 | 22 | 22 | 22 | 18 | 18 |
| Reduction of area in % | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 |
ASTM A387 steel sheet has an application temperature range of (316°C-593°C). Its high-temperature properties are of particular interest even in the current trend of applications requiring high-temperature toughness.
ASTM A387 steel is typically produced with fine grain, low silicon, low sulphur, calcium treatments and sometimes Q&T to achieve the highest toughness levels.
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