Description
ASTM A387 Steel Plate
ASTM A387 is a specification developed by ASTM International for chromium-molybdenum alloy steel plates designed for high-temperature service in welded boilers and pressure vessels. These plates are known for their exceptional strength, oxidation resistance, and thermal stability, making them ideal for use in the most demanding pressure environments.
ASTM A387 Chemical Composition
| Grade | Chromium (%) | Molybdenum (%) | Key Characteristics |
|---|---|---|---|
| A387 Gr. 11 | 1.00–1.50 | 0.45–0.65 | Good corrosion resistance, cost-effective choice |
| A387 Gr. 12 | 0.80–1.25 | 0.45–0.65 | Slightly lower Cr, stable at moderate temps |
| A387 Gr. 22 | 1.90–2.60 | 0.87–1.13 | High strength and heat resistance |
| A387 Gr. 91 | 8.00–9.50 | 0.85–1.05 | Enhanced creep strength at extreme temps |
ASTM A387 Mechanical Properties
| Property | Grade 11 / 12 | Grade 22 | Grade 91 |
|---|---|---|---|
| Tensile Strength (MPa) | 415–585 | 415–585 | 585–760 |
| Yield Strength (MPa) | ≥ 205 | ≥ 240 | ≥ 415 |
| Elongation (%) | ≥ 20 | ≥ 18 | ≥ 18 |
| Impact Resistance | Charpy V-notch Tested (Class 2) |
Features & Benefits
- Withstands high-temperature, high-pressure environments
- Excellent weldability and fabrication properties
- Superior resistance to hydrogen-induced cracking and sulfide stress corrosion (H2S)
- Long service life in harsh environments
- Cost-effective for long-term boiler operations
Dimensions & Supply Range
| Product Name | Dimensions |
| ASTM A387 Grade 11 | T: 0.185 – 3.60 in |
| L: 73 – 590 in | |
| W: 60 – 131.9 in | |
| ASTM A387 Grade 12 | T: 0.276 – 2.00 in |
| L: 154 – 590 in | |
| W: 75 – 129.9 in | |
| ASTM A387 Grade 22 | T: 0.185 – 3.60 in |
| L: 73 – 590 in | |
| W: 60 – 131.9 in |
Product Forms Available
- ASTM A387 Plates
- ASTM A387 Sheets
- ASTM A387 Rolled Plates
- Cut Blanks & Profiles
Applications
| Industry | Common Use Cases |
|---|---|
| Oil & Gas | Pressure vessels, separators, heat exchangers |
| Petrochemical | Reactors, furnaces, distillation columns |
| Power Generation | Steam drums, boilers, superheaters |
| Chemical Plants | Pressure reactors, storage tanks |
| Shipbuilding | Onboard pressure handling components |
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