FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
LADHANI METAL CORPORATION, MUMBAI, INDIA
Introduction
SA 387 Alloy Steel Plate / Sheet is a high-performance chromium-molybdenum (Cr-Mo) alloy steel material specified under ASME and ASTM standards. It is specially developed for applications involving high temperature and high pressure service where superior mechanical strength, oxidation resistance, and creep resistance are required. SA 387 alloy steel plates are extensively used in pressure vessels, boilers, heat exchangers, reactors, and refinery equipment operating under severe thermal and mechanical conditions.
The presence of chromium improves resistance to oxidation and corrosion at elevated temperatures, while molybdenum enhances strength, creep resistance, and resistance to hydrogen-induced damage. Due to these properties, SA 387 alloy steel plates are widely used in oil and gas, petrochemical, power generation, fertilizer, and chemical processing industries.
SA 387 plates and sheets are manufactured in multiple grades, each designed to meet specific temperature and pressure requirements. These plates are typically supplied in normalized and tempered or quenched and tempered condition to ensure stable microstructure and consistent mechanical performance.
Applicable Standards and Specifications
ASTM / ASME Standard: SA 387 / ASTM A387
Product Forms: Plates, sheets, coils (limited to thinner gauges)
Manufacturing Process: Hot Rolled (HR)
Heat Treatment: Normalized and Tempered (N&T) or Quenched and Tempered (Q&T)
SA 387 alloy steel conforms to ASME Boiler and Pressure Vessel Code requirements and is globally accepted for pressure equipment fabrication.
Available Grades of SA 387 Alloy Steel
SA 387 alloy steel plates are available in several grades based on chromium and molybdenum content:
SA 387 Grade 11 – 1.25% Chromium, 0.5% Molybdenum
SA 387 Grade 12 – 1% Chromium, 0.5% Molybdenum
SA 387 Grade 22 – 2.25% Chromium, 1% Molybdenum
SA 387 Grade 91 – 9% Chromium, 1% Molybdenum with vanadium, niobium, and nitrogen additions
Higher grades provide improved resistance to high-temperature oxidation, creep deformation, and pressure-related stress.
Chemical Composition of SA 387 Alloy Steel (%)
| Element | Grade 11 | Grade 12 | Grade 22 | Grade 91 |
|---|---|---|---|---|
| Carbon (C) | 0.05 – 0.15 | 0.05 – 0.15 | 0.05 – 0.15 | 0.08 – 0.12 |
| Manganese (Mn) | 0.30 – 0.60 | 0.30 – 0.60 | 0.30 – 0.60 | 0.30 – 0.60 |
| Silicon (Si) | 0.50 max | 0.50 max | 0.50 max | 0.20 – 0.50 |
| Chromium (Cr) | 1.00 – 1.50 | 0.80 – 1.25 | 2.00 – 2.50 | 8.00 – 9.50 |
| Molybdenum (Mo) | 0.45 – 0.65 | 0.45 – 0.65 | 0.90 – 1.10 | 0.85 – 1.05 |
| Phosphorus (P) | 0.025 max | 0.025 max | 0.025 max | 0.020 max |
| Sulfur (S) | 0.025 max | 0.025 max | 0.025 max | 0.010 max |
| Vanadium (V) | — | — | — | 0.18 – 0.25 |
| Niobium (Nb) | — | — | — | 0.06 – 0.10 |
| Nitrogen (N) | — | — | — | 0.03 – 0.07 |
Note: Chemical composition may vary slightly depending on plate thickness and heat treatment but remains within ASTM and ASME limits.
Mechanical Properties of SA 387 Alloy Steel
Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| SA 387 Grade 11 | 415 – 585 | ≥ 205 | ≥ 20 |
| SA 387 Grade 12 | 415 – 585 | ≥ 205 | ≥ 20 |
| SA 387 Grade 22 | 415 – 585 | ≥ 205 | ≥ 20 |
| SA 387 Grade 91 | 585 – 760 | ≥ 415 | ≥ 20 |
SA 387 Grade 91 offers superior creep rupture strength and is suitable for long-term service at very high operating temperatures.
Physical Properties (Typical)
Density: approximately 7.85 g/cm³
Melting Point: approximately 1400 to 1500°C
Thermal Conductivity: approximately 25 to 30 W/m·K
Modulus of Elasticity: approximately 200 GPa
Thickness, Width, and Size Range
Thickness: 5 mm to 200 mm
Width: up to 3000 mm
Length: 2000 mm to 12000 mm or as per customer requirement
Plates can be supplied in normalized, stress-relieved, heat-treated, or cut-to-size condition.
Key Features and Advantages of SA 387 Alloy Steel
Excellent strength retention at elevated temperatures
High resistance to oxidation and hydrogen attack
Superior creep resistance for long-term service
Good weldability with proper preheating and post-weld heat treatment
Long service life under severe pressure and thermal conditions
Compliance with ASME pressure vessel requirements
Corrosion and Oxidation Resistance
SA 387 alloy steel provides excellent resistance to oxidation at elevated temperatures. While it does not offer full corrosion resistance like stainless steel, it performs exceptionally well in high-temperature environments where carbon steel would rapidly degrade.
Typical Applications of SA 387 Alloy Steel Plate / Sheet
Pressure Equipment and Boilers
Pressure vessels and boilers
Heat exchangers and condensers
Steam drums and headers
Reactor vessels
Oil and Gas Industry
Refinery process equipment
Hydrocrackers and reformers
High-pressure piping systems
Petrochemical reactors
Power Generation
Thermal power plant boilers
Superheaters and reheaters
High-temperature structural components
Chemical and Fertilizer Industry
Ammonia and urea plants
High-temperature chemical reactors
Process vessels
Comparison with Other Steel Grades
SA 387 alloy steel is commonly compared with SA 516 carbon steel plates. While SA 516 is suitable for moderate temperature and pressure service, SA 387 is preferred for high-temperature applications due to its superior creep strength, oxidation resistance, and long-term reliability.
Testing and Quality Assurance
SA 387 plates and sheets typically undergo:
Chemical composition analysis
Tensile testing
Impact testing (when specified)
Heat treatment verification
Ultrasonic testing
Dimensional and visual inspection
Material Test Certificates as per EN 10204 3.1 are supplied on request.
Conclusion
SA 387 Alloy Steel Plate / Sheet is a critical material for high-temperature and high-pressure industrial applications. Its enhanced mechanical strength, excellent creep resistance, and oxidation resistance make it indispensable in refineries, power plants, and chemical processing industries. When properly fabricated and heat-treated, SA 387 alloy steel delivers outstanding performance, safety, and durability over extended service life.
For customized sizes, bulk supply, or technical support, SA 387 alloy steel plates and sheets should be sourced from reliable manufacturers and suppliers complying with international quality standards.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
LADHANI METAL CORPORATION, MUMBAI, INDIA
Product Link:
https://www.indiamart.com/proddetail/sa-387-alloy-steel-plate-sheet-2858236260648.html?sellerpreview=1
https://www.ladhanimetal.in/products/sa-387-alloy-steel-plate-sheet/3259
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