Selection of steel materials considering thermal expansion and thermal fatigue of long-length equipment and dissimilar material structures.
SB480 and other SB materials, Mo-added SB materials, SCMV materials, heat-resistant stainless steel, etc.
Warping, restraint stress, and fatigue cracks due to partial heating and temperature differences. Please check from both material and structural perspectives!
In long structures and those with significant temperature differences, steel expands due to thermal expansion, leading to bending and the generation of restraint stresses. Repeated heating and cooling can cause alternating compressive and tensile stresses, which may result in thermal fatigue cracks. When combining different materials, attention must also be paid to the differences in linear expansion coefficients. The linear expansion coefficient of ordinary steel is approximately 11.4×10^-6/℃, while that of SUS304 is about 16.4×10^-6/℃, resulting in different amounts of expansion even under the same temperature difference. Additionally, the linear expansion coefficient changes with temperature. It is essential to verify not only the material changes but also the temperature distribution, member lengths, restraint conditions, support methods, expansion allowances, and dissimilar material joints, and to collaborate with designers to consider materials and processing methods.
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basic information
If you are experiencing the following issues with the use of steel materials at high temperatures, please feel free to contact us. - Long components elongate or steel plates warp during heating - Deformation occurs at the junction of ordinary steel and stainless steel - We want to suppress thermal fatigue cracks in areas that undergo repeated heating and cooling Confirmation items: minimum and maximum temperatures, temperature distribution, component length, restraint conditions, heating and cooling rates, number of cycles, combinations of different materials, required strength, and corrosion environment. We can supply and process materials, but the design for expansion, contraction, and stress needs to be confirmed by the equipment designer.
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Delivery Time
P3
※Kumagai Special Steel has a system in place for immediate delivery, focusing on SB410, including cutting and processing, so it takes about a week depending on the lot. However, for more specialized specifications or large lots, it may take longer. Please contact us via email or phone for inquiries!!
Applications/Examples of results
The following explains the applications and practical examples of SB materials (SB410, SB450, SB480). Boiler and pressure vessel steel plates are designed for equipment that requires safety and reliability under high temperature and high pressure conditions. They are manufactured under strict standards and are used as essential materials supporting various plants and energy-related equipment. 1. Main Applications and Practical Examples - Power generation equipment: Boiler bodies, drums, piping components - Chemical plants: Pressure vessels, reaction tanks, storage tanks - Thermal-related equipment: Heat exchangers, heating furnace components - Energy sector: Oil and gas-related equipment - Industrial equipment: Structures for high temperature and high pressure applications 2. Evaluation Points in Practical Use - Stable mechanical performance under high temperature and high pressure - High safety based on strict standards - Suitable for welded structures, compatible with equipment fabrication 3. Expected Future Market Areas - Renewal and enhancement of energy infrastructure - Hydrogen and ammonia-related equipment - Longevity and safety improvements for plants - Industrial equipment aiming for higher efficiency Boiler and pressure vessel steel plates are expected to maintain stable demand as important materials primarily in the energy and plant sectors, based on safety and durability.
Line up（4）
| Model number | overview |
|---|---|
| SB480 (carbon steel plate with high strength (480-620 MPa grade)) | Selected for conditions with high design loads and pressures. As strength increases, attention to welding conditions and processing management becomes important. |
| JIS G4109 SCMV material | It is a low-alloy heat-resistant steel used in high-temperature and high-pressure environments, such as boilers in thermal power plants and desulfurization reaction towers in oil refining plants. It demonstrates excellent high-temperature strength and environmental resistance in the temperature range of approximately 350°C to 600°C, exceeding the usage limit of carbon steel (around 350°C to 400°C). |
| JIS G4312 SUS310S-HR | It is a fully austenitic heat-resistant stainless steel of the 25Cr-20Ni series. It boasts significantly superior oxidation resistance and high-temperature creep strength compared to general-purpose austenitic steels (such as SUS304), and can be used in atmospheric (oxidizing) environments without structural stresses other than its own weight to prevent oxidative wear, with a maximum operating temperature of 1,100°C to 1,150°C (although measures against deflection due to its own weight are necessary). |
| JIS G4902 NCF800HP | This is a Fe-Ni-Cr-based austenitic heat-resistant superalloy equivalent to Alloy 800H (UNS N08810) according to U.S. standards. It exhibits excellent high-temperature strength, carburization resistance, and oxidation resistance in the high-temperature creep range (approximately 600°C to over 900°C), making it suitable for critical components in petrochemical plant cracking furnaces, reforming furnaces, power plants, and nuclear-related equipment. |
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Company information
Since our establishment in 1913, we have been a specialized trading company of special steel for nearly a century, listening to the needs of many customers and building an ideal relationship between customers and steel manufacturers as a conductor of steel distribution. As a trading company with various processing equipment, including cutting machines and laser cutting machines, we also contribute to reducing our customers' capital investment. Please feel free to contact us if you have any requests.
