15MO3 is a kind of alloy steel that belongs to the group of creep-resistant molybdenum steels. It is mainly used in the manufacture of pressure vessels, boilers, and pipes that operate at elevated temperatures. This material contains a small amount of molybdenum, which improves its strength and ability to resist deformation under long-term heat and pressure. The steel also has good weldability and can be processed using standard methods. Its properties make it suitable for applications in power plants, chemical refineries, and other industrial environments where reliable performance at high temperatures is required.
Specification of 15Mo3 Steel Plate
| Specification | ASTM A204 / ASME SA204 |
| Grade | 15MO3 |
| Width | 1500mm to 3500mm |
| Thickness | 6mm to 100mm |
| Length | 3000mm to 18000mm |
| Finish | Cold rolled sheet (CR), Hot rolled plate (HR), 2D, 2B, SATIN (Met with Plastic Coated), BA NO(8) |
| Hardness | Hard, Soft, Quarter Hard, Half Hard, Spring Hard etc. |
Chemical Composition of 15Mo3 Steel Plates
| Grade | C. max | Mn. | S. | N | Cu | Si. | P. | Cr. | Ni. | Mo. |
|---|---|---|---|---|---|---|---|---|---|---|
| 15Mo3 | 0.12- 0.2 | 0.40- 0.90 | 0.01 | 0.012 | 0.30 | 0.35 | 0.025 | 0.30 | 0.30 | 0.25- 0.35 |
Mechanical Properties Of 15Mo3 Plates & Sheets
| Grade | Tensile Strength (Mpa) |
Yield Strength (Mpa) |
Elongation in 100-150 mm(%) | Elongation in 16 mm(%) |
Max Thickness (mm) |
|---|---|---|---|---|---|
| 15Mo3 | 440-590 | 220-275 | 19 | 24 | 250 |
Equivalent Material of 15Mo3 Sheet
| STANDARD | UNS | WERKSTOFF NR. | GOST | EN | JIS | BS |
| 15MO3 | – | 1.5415 | – | EN 10028-2 | JIS G3115 | BS 1501 |
applications
Boiler and pressure vessel fabrication: The material is commonly employed in constructing boilers, steam generators, and pressure vessels that operate at elevated temperatures. Its creep resistance ensures structural integrity even under continuous thermal stress, which is essential for safe and reliable operation in power generation and industrial processing.
Petrochemical and refinery equipment: It is used for pipes, heat exchangers, and reactor components in refineries and chemical plants. These systems often involve high temperatures and corrosive fluids, and the steel's stability helps prevent failure and maintain process efficiency.
Power generation industry: In thermal power plants, it is utilized for superheater tubes, headers, and other boiler parts that are exposed to high‑temperature steam. The material's performance under prolonged heat makes it a preferred choice for ensuring long service life and reducing maintenance needs.
General high‑temperature engineering: It also finds application in various industrial furnaces, heat treatment equipment, and piping systems where consistent performance at elevated temperatures is required. Its good weldability allows for flexible fabrication, supporting its use in custom engineering solutions.
processing
Melting and refining:
The steel is produced in electric arc furnaces or basic oxygen furnaces, where precise amounts of iron, carbon, molybdenum, and other elements are added. Refining processes such as ladle metallurgy are used to adjust chemical composition, reduce impurities, and improve cleanliness, which is essential for enhancing toughness and creep resistance.
Casting:
After refining, the molten steel is cast into ingots or continuously cast into slabs, blooms, or billets. Continuous casting is preferred for its improved homogeneity and reduced segregation, which helps maintain consistent properties throughout the material.
Hot rolling:
The cast material is reheated and rolled into plates, sheets, or tubes. Hot rolling refines the grain structure, improves mechanical properties, and imparts the desired thickness and shape. Temperature control during rolling is critical to avoid excessive grain growth and ensure good strength at high temperatures.
Heat treatment:
Depending on the application, fifteen MO three may undergo normalizing, quenching, and tempering. Normalizing refines the microstructure, while tempering reduces hardness and improves toughness. Proper heat treatment ensures the steel achieves the optimal balance of strength, ductility, and creep resistance required for high‑temperature service.
Finishing and inspection:
The final products are subjected to various finishing processes such as straightening, machining, and surface cleaning. Non‑destructive testing methods including ultrasonic, radiographic, and magnetic particle inspection are performed to detect defects and ensure compliance with industry standards, guaranteeing reliability in critical applications.
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What heat treatment is 15MO3 subjected to?
Common heat treatments for 15MO3 include normalizing (880-920°C, air cooling) and tempering (600-650°C, air cooling). This refines the grain structure, improves mechanical properties, and ensures stable performance at high temperatures.
What is the fatigue strength of 15MO3?
The fatigue strength of 15MO3 at room temperature is about 200-250 MPa (for 10⁷ cycles). This property is important for components subjected to cyclic loads, such as steam turbine components in power plants.
Can 15MO3 be used in marine environments?
It is not recommended for long-term use in marine environments. Seawater's high salt content causes severe corrosion to 15MO3. Special marine-grade steels or additional anti-corrosion coatings are required for marine applications.
What is the grain size of 15MO3 after normalizing?
After normalizing, 15MO3 typically has a grain size of ASTM 5-8. Fine and uniform grains improve the material's toughness, strength, and creep resistance, ensuring stable performance in high-temperature environments.
Is 15MO3 resistant to corrosion?
15MO3 has moderate corrosion resistance, especially in high-temperature steam and mild corrosive media. However, it is not suitable for strong corrosive environments (e.g., acidic or alkaline solutions) without additional anti-corrosion treatment.
Can 15MO3 be machined?
Yes, 15MO3 has good machinability. It can be processed by turning, milling, drilling, and other conventional machining methods. Using appropriate cutting tools and parameters ensures high processing efficiency and surface quality.
What is the coefficient of thermal expansion of 15MO3?
The coefficient of thermal expansion of 15MO3 is about 11.5 × 10⁻⁶ /°C (20-500°C). This parameter is crucial for designing high-temperature components to avoid thermal stress and deformation during temperature changes.
What is the density of 15MO3?
The density of 15MO3 is approximately 7.85 g/cm³, the same as ordinary carbon steel. This makes it easy to calculate weight during component design and manufacturing, without increasing structural load excessively.
What is the melting point of 15MO3?
The melting point range of 15MO3 is 1450-1500°C, similar to other low-alloy steels. This high melting point ensures it can maintain structural integrity in high-temperature service environments without melting or deforming.