Under ASTM A387, chrome molybdenum alloy steel plates are available in several grades with varying alloy compositions. Commonly used grades include Grade 11, Grade 22, Grade 5, Grade 9, and Grade 91. These grades are distinguished by their specific alloying elements and are designed for different temperature and corrosion resistance requirements in various industrial applications, especially in high-temperature environments such as power generation and processing industries.
| Chemical Composition of ASTM A387 Alloy Steel Plates, % | ||||||||
|---|---|---|---|---|---|---|---|---|
| Grade | UNS | C | Mn | P | S | Si | Cr | Mo |
| Grade 2 | S50460 | 0.04-0.21 | 0.50-0.88 | 0.025 | 0.025 | 0.13-0.45 | 0.46-0.85 | 0.40-0.65 |
| Grade 12 | K11757 | 0.04-0.17 | 0.35-0.73 | 0.025 | 0.025 | 0.13-0.45 | 0.74-1.21 | 0.40-0.65 |
| Grade 11 | K11789 | 0.04-0.17 | 0.35-0.73 | 0.025 | 0.025 | 0.44-0.86 | 0.94-1.56 | 0.40-0.70 |
| Grade 22 | K21590 | 0.04-0.15 | 0.25-0.66 | 0.025 | 0.025 | ≤0.50 | 1.88-2.62 | 0.85-1.15 |
| Grade 22L | K21590 | ≤0.12 | 0.25-0.66 | 0.025 | 0.025 | ≤0.50 | 1.88-2.62 | 0.85-1.15 |
| Grade 21 | K31545 | 0.04-0.15 | 0.25-0.66 | 0.025 | 0.025 | ≤0.50 | 2.63-3.37 | 0.85-1.15 |
| Grade 21L | K31545 | 0.12 | 0.25-0.66 | 0.025 | 0.025 | ≤0.50 | 2.63-3.37 | 0.85-1.15 |
| Grade 5 | S50200 | ≤0.15 | 0.25-0.66 | 0.025 | 0.025 | ≤0.55 | 3.90-6.10 | 0.40-0.70 |
| Grade 9 | K90941 | ≤0.15 | 0.25-0.66 | 0.025 | 0.025 | ≤1.05 | 7.90-10.10 | 0.85-1.15 |
| Grade 91 | K90901 | 0.06-0.15 | 0.25-0.66 | 0.025 | 0.012 | 0.18-0.56 | 7.90-9.60 | 0.80-1.10 |
| Mechanical Properties of ASTM A387 Alloy Steel | ||||
|---|---|---|---|---|
| Grade | Tensile Strength, ksi[MPa] | Yield Strength, min. ksi[MPa] | Elongation, min. % | |
| 8 inch | 2 inch | |||
| Grade 2 CL 1 | 55-80[380-550] | 33[230] | 18 | 22 |
| Grade 2 CL 2 | 70-90[485-620] | 45[310] | 18 | 22 |
| Grade 12 CL 1 | 55-80[380-550] | 33[230] | 18 | 22 |
| Grade 12 CL 2 | 65-85[450-585] | 40[275] | 19 | 22 |
| Grade 11 CL1 | 60-85[415-585] | 35[240] | 19 | 22 |
| Grade 11 CL2 | 75-100[515-690] | 45[310] | 18 | 22 |
| Grade 22 CL1 | 60-85[415-585] | 30[205] | - | 18 |
| Grade 22 CL2 | 75-100[515-690] | 45[310] | - | 18 |
| Grade 22L CL1 | 60-85[415-585] | 30[205] | - | 18 |
| Grade 21 CL1 | 60-85[415-585] | 30[205] | - | 18 |
| Grade 21 CL2 | 75-100[515-690] | 45[310] | - | 18 |
| Grade 21L CL1 | 60-85[415-585] | 30[205] | - | 18 |
| Grade 5 CL1 | 60-85[415-585] | 30[205] | - | 18 |
| Grade 5 CL2 | 75-100[515-690] | 45[310] | - | 18 |
| Grade 9 CL1 | 60-85[415-585] | 30[205] | - | 18 |
| Grade 9 CL2 | 75-100[515-690] | 45[310] | - | 18 |
| Grade 91 CL2 | 85-110[585-760] | 60[415] | - | 18 |
Each grade except Grade 91 is available in two classes of tensile strength levels as defined in the Tensile Requirements tables. Grade 91 is available only as Class 2. Grade 91 consists of two types, with Type 2 differentiated from Type 1 by requiring restricted composition for the enhancement of creep resistance.
Most commonly used steel specifications for Chrome Moly plate are ASME SA387 and ASTM A387
• Chemical and mechanical properties of the ASME and ASTM specifications are the same.
• Brown McFarlane supplies Chrome Moly plates to ASME SA387 and ASTM A387 both from stock and, where required by the customer, cut to size and shape.
Hot Tags: astm a387 chrome moly pressure vessel steel, China astm a387 chrome moly pressure vessel steel manufacturers, suppliers, factory