- Thickness: 5-100mm
- Length: 2000mm, 4000mm, or as per requirements
- Width: 1000mm, 1500mm, or as per requirements
- Application: Steel boiler plate, pressure vessel plate
- Additional Processes: Annealing, normalizing plus tempering, or accelerated cooling using blast or liquid quenching from austenitizing temperature, followed by tempering (subject to buyer's agreement)
- Surface Finish: Coated or Shot Blasting and Painting
- Delivery Condition: Hot Rolled, Cold Rolled
- Steel Grades: Grade 2, Grade 12, Grade 11, Gr.22, Gr.22L, Gr.21, Gr.21L, Gr.5, Gr.9, Gr.91
The ASTM A387 specification encompasses chromium-molybdenum alloy steel plates designed for welded boilers and pressure vessels intended for elevated temperature service. This specification includes various steel plate grades such as 2, 12, 11, 22, 22L, 21, 21L, 5, 9, and 91. The steel products must undergo killing and heat treatment processes. For decades, industries such as petrochemical, hydrocarbon processing, and coal conversion have extensively utilized this steel, with variations based on chromium and molybdenum content. Grade 12, 11, 22, and 5 are among the most commonly used, available in two strength levels: class 1 and class 2.
ASTM A387 steel plates find application in a temperature range from 316℃ to 593℃. These alloy steel plates retain their elevated temperature properties and are particularly valued for their fine grain, low silicon, low sulfur, calcium-treated composition. Occasionally, they are produced as quenched and tempered to achieve the highest levels of toughness.
ASTM A387 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. | |||||||||||
ASTM A387 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 Ksi(Mpa) | 55~80 (380~550) | 60~85 (415~585) | 60~85 (415~585) |
| Yield Strength, min Ksi(Mpa) | 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 40C |
| 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 Ksi(Mpa) | 70~90 (485~620) | 75~100 (515~690) | 65~85 (450~585) | 75~100 (515~690) | 85~110 (585~760) |
| Yield Strength, min Ksi(Mpa) | 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 40C | - | |
ASTM A387 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 | ––– |
If you're considering the purchase of ASTM A387 steel plate products, feel free to reach out to us for the most up-to-date pricing. Alternatively, you can refer to the table below for the equivalent steel grades of ASTM A387.
