SA 387 Gr 5 Cl 1 is a chromium-molybdenum alloy steel plate, specified by ASME/ASTM standards, designed for welded boilers and pressure vessels used in high-temperature service, offering excellent strength and corrosion resistance due to its Cr/Mo content, making it ideal for petrochemical, power generation, and other critical industrial applications.
Tensile Requirements for ASME SA387 Grade 5 Alloy Steel Plates
| Designation: | Requirement: | Grade 5 |
|
SA387 Grade 5 |
Tensile strength, ksi [MPA] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 45 [310] | |
| Elongation in 8 in. [200mm], min % | ... | |
| Elongation in 2 in. [50mm], min, % | 18 | |
| Reduction of area, min % | 45 (measured on round specimen) 40 (measured on flat specimen) |
Chemical Requirements for ASME SA387 Grade 5 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| SA 387 Grade 5 | ||
| Carbon: | Heat Analysis: | 0.15 max |
| Product Analysis: | 0.15 max | |
| Manganese: | Heat Analysis: | 0.30 - 0.60 |
| Product Analysis: | 0.25 - 0.66 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.030 |
| Product Analysis: | 0.030 | |
| Silicon: | Heat Analysis: | 0.50 max |
| Product Analysis: | 0.55 max | |
| Chromium: | Heat Analysis: | 4.00 - 6.00 |
| Product Analysis: | 3.90 - 6.10 | |
| Molybdenum: | Heat Analysis: | 0.45 - 0.65 |
| Product Analysis: | 0.40 - 0.70 |
Applications
Oil & GasPressure vessels, sealed storage tanks, corrosion-resistant pipelines for mild sour service, and critical structural components for offshore drilling platforms, ideal for harsh extraction and transmission environments.
Petrochemical & ChemicalHeavy-duty equipment requiring high strength and stable corrosion resistance at elevated temperatures, including high-pressure reactors, heat-exchange condensers and process piping systems for chemical synthesis.
Power GenerationCore equipment components like industrial boiler drums, turbine casings, and high-efficiency heat transfer parts, supporting long-term operation of thermal and combined-cycle power plants.
MarineDurable components for seawater-handling equipment and marine vessels, such as seawater heat exchangers and pressure-resistant hull fittings, with good resistance to marine corrosion.
Industrial BoilersKey structural parts where excellent heat resistance is paramount, including furnace walls, steam headers and superheater supports, ensuring safe and efficient boiler operation under high-temperature conditions.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
1.What is SA 387 GR 5 material?
A high quality chrome molybdenum alloy steel plate intended specifically for use in weldable carbon steel pressure vessels at elevated temperatures. Added molybdenum gives the material greater temperature tensile strength and the chromium provides improved corrosion resistance.
2.What is the difference between SA 387 Gr 5 Cl 1 and Cl 2?
SA 387 Gr 5 Cl 1 and Cl 2 share the same chemical composition (chromium-molybdenum) but differ in their mechanical properties, with Class 2 generally having higher tensile strength (75-100 ksi vs 70-90 ksi) and yield strength (min 45 ksi vs min 50 ksi) than Class 1, making Class 2 suitable for more demanding high-temperature pressure vessel applications.