SA 387 Gr 5 Cl 1 is a specific type of chromium-molybdenum alloy steel plate standardized by ASME (SA) for use in weldable boilers and pressure vessels operating at elevated temperatures.
Equivalents
| BS | EN | ASME | DIN |
| ... | ... | SA387-5-1 | ... |
Specifications ASME SA387 Grade 5 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| SA387 Grade 5 | 5.00% | 0.50% |
Tensile Requirements for ASME SA387 Grade 5 Alloy Steel Plates Class 1 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
Pressure Vessels & Boilers: Its main use is in fabricating components like drums and shells for high-temperature service in industrial boilers and pressure vessels, enduring long-term thermal stress.
Petrochemical & Chemical Plants: Ideal for refinery reactors and chemical processing tanks-its high-temperature corrosion resistance suits harsh process environments.
Power Generation: Used in thermal power plants for boilers, heat exchangers and steam pipes, supporting stable energy production.
Oil & Gas: Found in offshore drilling equipment, sour-service storage tanks and wellhead gear, adapting to tough extraction conditions.
Heat Exchangers & Condensers: Suited for efficient heat transfer in tube sheets and shells, serving diverse industrial production flows.
Advantages
High-Temperature Strength: Maintains structural integrity and mechanical properties at elevated temperatures, crucial for industrial applications.
Corrosion Resistance: Chromium content provides improved resistance to general corrosion and oxidation, especially in high-heat environments.
Weldability: Good weldability allows for fabrication using conventional methods without compromising mechanical properties, thanks to its controlled chemistry.
Thermal Stability: Resists embrittlement during prolonged thermal cycling, leading to longer component life.
Versatility: Suitable for heat exchangers, pipelines, storage tanks, and boilers in oil, gas, and chemical industries.
Cost-Effectiveness: Durable and reliable performance reduces downtime and maintenance, offering long-term economic benefits.
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1.How does SA 387 Gr 5 Cl 1 differ from SA 387 Gr 5 Cl 2?
The main difference lies in tensile strength-Cl 2 has a higher tensile strength than Cl 1, making it suitable for more demanding high-pressure service scenarios.
2.Is SA 387 carbon steel?
Weldable carbon steel plates for pressure vessels and boilers used in elevated temperatures. The material benefits from added chromium and molybdenum which gives the steel greater corrosion resistance and resistance to heat.
3.What are the core properties of SA 387 Gr 5 Cl 1?
It features good high-temperature strength, oxidation resistance, reliable weldability and creep resistance, suitable for long-term operation under elevated temperatures.