16Mo3 is a low-alloy steel with a molybdenum addition, typically used in pressure vessels, boilers, and pipes operating at elevated temperatures. It offers good creep resistance and thermal strength, and is often supplied in the normalized or normalized and tempered condition. Welding usually requires preheating and post-weld heat treatment to prevent cold cracking and ensure mechanical properties.
16Mo3 Vessel Plate Chemical Composition:
| Carbon (C) | 0.12/0.20 |
| Silicon (Si) | 0.35 |
| Manganese (Mn) | 0.40/0.90 |
| Phosphorus (P) | 0.025 |
| Sulphur (S) | 0.010 |
| Chromium (Cr) | 0.030 |
| Molybdenum (Mo) | 0.25/0.35 |
| Nickel (Ni) | 0.30 |
| Nitrogen (N) | 0.012 |
| Copper (Cu) | 0.30 |
16Mo3 Boiler Plate Material Mechnical Property:
| Thickness | Temperature (DEG C) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| (mm) | 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 |
| - | MPa | MPa | MPa | MPa | MPa | MPa | MPa | MPa | MPa | MPa |
| < 16 | 273 | 264 | 250 | 233 | 213 | 194 | 175 | 159 | 147 | 141 |
| > 16 < 40 | 268 | 259 | 245 | 228 | 209 | 190 | 172 | 156 | 145 | 139 |
| > 40 < 60 | 258 | 250 | 236 | 220 | 202 | 183 | 165 | 150 | 139 | 134 |
| > 60 < 100 | 238 | 230 | 218 | 203 | 186 | 169 | 153 | 139 | 129 | 123 |
| > 100 < 150 | 218 | 211 | 200 | 186 | 171 | 155 | 140 | 127 | 118 | 113 |
| > 150 < 250 | 208 | 202 | 191 | 178 | 163 | 148 | 134 | 121 | 113 | 108 |
16Mo3 Boiler Quality Plate Equivalent Grades:
| EU EN | USA | Germany DIN,WNr | Japan JIS |
| 16Mo3 | A204Gr.A A204Gr.B |
15Mo3 16Mo3 |
STBA12 |
advantages
Excellent high-temperature performance:
It maintains good strength and creep resistance at elevated temperatures, resisting deformation and damage during long-term thermal exposure, suitable for high-temperature working conditions.
Good mechanical properties:
After reasonable heat treatment, it has balanced toughness and hardness, with strong load-bearing capacity and not easy to crack, ensuring structural stability.
Favorable processability:
It is easy to carry out hot forming, machining and welding. With standard process control, it can obtain high-quality workpieces and welded joints, reducing processing difficulty and cost.
Good corrosion resistance:
It has certain oxidation and corrosion resistance to steam, hot gas and common industrial media, extending the service life of equipment.
Cost-effectiveness:
Compared with high-alloy steels, it has lower production and application costs while meeting key service requirements, with high cost performance.
processing
Heating and forming: The steel should be heated uniformly to the recommended range before hot working to ensure good ductility and prevent cracking. After forming, controlled cooling helps maintain the desired microstructure and mechanical properties.
Heat treatment: 16Mo3 is often supplied in the normalized or normalized and tempered condition. Normalization refines the grain structure, while tempering improves toughness and reduces internal stresses, making the material more suitable for high-temperature service.
Machining: The steel can be machined using standard methods, but its strength and hardness may require appropriate tooling and cutting speeds. Proper lubrication and cooling help reduce tool wear and maintain surface quality.
Welding: Welding 16Mo3 requires strict procedure control. Preheating is often necessary to minimize the risk of cold cracking, especially in thicker sections. Post-weld heat treatment is typically applied to relieve residual stresses, improve toughness in the heat-affected zone, and ensure the joint performs well under thermal loading.
Cleaning and inspection: Before and after processing, the material should be cleaned to remove scale, oil, and contaminants that could affect weld quality or service performance. Non-destructive testing is commonly used to check for defects in both base material and welded joints.
applications
Boilers and steam generators:
Used in critical parts such as headers, drums, superheater and reheater components, and connecting pipes that operate under high temperature and pressure for extended periods.
Pressure vessels:
Applied in reactors, columns, and storage tanks handling hot fluids and gases in chemical, petrochemical, and refinery plants, where reliable performance under thermal stress is essential.
Heat exchangers:
Utilized in shell-and-tube exchangers and other heat-transfer equipment for processing hot streams, thanks to its ability to retain mechanical properties at service temperatures.
Piping and tubing:
Employed in high-temperature pipelines carrying steam, hot water, or process fluids in power generation, district heating, and industrial systems, especially in sections subject to long-term thermal loading.
Furnace and process equipment:
Used in furnace shells, ducts, and structural parts of thermal processing units that require heat resistance and dimensional stability during continuous operation at elevated temperatures.
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What is the carbon content range of 16Mo3 steel?
The carbon content of 16Mo3 steel is strictly controlled between 0.14% and 0.20%. This range ensures good weldability and toughness while maintaining sufficient strength for pressure-bearing applications.
How does temperature affect the mechanical properties of 16Mo3 steel?
Below 530°C, 16Mo3 retains stable strength and toughness. As temperature rises beyond this, tensile strength and yield strength decrease gradually, while creep deformation increases significantly.
What is the post-weld heat treatment temperature for 16Mo3 steel?
The recommended post-weld heat treatment temperature for 16Mo3 is 600-650°C, held for a suitable time. This relieves welding stress, improves weld joint toughness, and prevents intergranular corrosion.
Is 16Mo3 steel a low-alloy steel?
Yes, 16Mo3 is a low-alloy steel. It contains small amounts of alloying elements (molybdenum, manganese) on a carbon steel basis, which enhance its properties without significantly increasing production costs.
What is the density of 16Mo3 steel?
The density of 16Mo3 steel is approximately 7.85 g/cm³, the same as ordinary carbon steel. This density is a key parameter for weight calculation in equipment design and manufacturing.
Can 16Mo3 steel be cold-formed?
16Mo3 can be cold-formed under certain conditions. For thick plates or complex shapes, preheating may be needed to avoid cracking. Cold forming should be followed by stress relief heat treatment if required.
What is the application of 16Mo3 steel in the petrochemical industry?
In petrochemicals, 16Mo3 is used for reactors, heat exchangers, and pipelines. It withstands high temperatures and pressures during oil refining and chemical processing, ensuring equipment safe operation.
What are the defects to avoid in 16Mo3 steel casting?
Key defects to avoid include porosity, shrinkage, cracks, and inclusions. Strict control of casting temperature, pouring speed, and mold quality is essential to ensure the integrity of 16Mo3 castings.
How to test the mechanical properties of 16Mo3 steel?
Mechanical properties are tested via tensile tests, impact tests, hardness tests, and creep tests. These tests verify tensile strength, toughness, hardness, and high-temperature creep resistance as per EN 10028-2.
What is the difference between 16Mo3 and 20Mo5 steel?
20Mo5 has higher molybdenum (0.45-0.60%) and carbon content than 16Mo3, offering better high-temperature strength and creep resistance. 20Mo5 is for higher-temperature equipment, while 16Mo3 is for moderate-temperature applications.