Selection of steel materials for long-term use exceeding 450℃ | Measures against creep and microstructural changes
SB480 and other SB materials, Mo-added SB materials, SCMV materials, heat-resistant stainless steel, etc.
High-temperature creep that deforms and fractures below the yield point. Selecting materials based on temperature, stress, and time.
When steel continues to be subjected to stress at high temperatures exceeding approximately 450°C, "creep" becomes a problem, where deformation progresses over time even under stresses lower than the yield strength. During long-term operation, issues such as graphitization, carbide growth, oxidation, and reduction in toughness may also occur, and there may be cases where the material does not return to its original performance after cooling. At temperatures around 450 to 650°C, materials with creep strength and allowable stress corresponding to the operating temperature and stress are required. SB materials, Mo-added SB materials, SCMV materials, and heat-resistant stainless steels will be compared based on applicable standards. At even higher temperatures, candidates include SUS310S-HR and NCF-type heat-resistant alloys. Please also check the design life, heating and cooling history, oxidation environment, and post-weld heat treatment.
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basic information
If you are experiencing the following issues with the use of steel materials for long-term operation at high temperatures, please feel free to contact us. - I want to consider the creep life of components used for long periods at high temperatures. - I would like to organize the selection range for SB materials, SCMV materials, and heat-resistant stainless steel. - I also want to confirm the reduction in strength and toughness after returning to room temperature. Consideration candidates: SB materials, SB-M materials, SCMV materials, heat-resistant stainless steel, Ni-based heat-resistant alloys, etc. The expected temperature range varies by standard and steel type, so we prioritize the allowable stress tables from design standards and manufacturer documentation.
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Delivery Time
P3
※Kumagai Special Steel has an immediate delivery system centered around 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 by 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 standard management and are adopted as core materials supporting various plants and energy-related equipment. 4. Main Applications and Practical Examples - Power generation equipment: Boiler body, 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 compatible devices 5. Evaluation Points in Practical Use - Stable mechanical performance under high temperature and high pressure - High safety based on strict standards - Suitable for welded structures and compatible with equipment fabrication 6. Expected Future Market Areas - Renewal and enhancement of energy infrastructure - Hydrogen and ammonia-related equipment - Extension of plant lifespan and improvement of safety - Industrial equipment sector aiming for high 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.
Detailed information
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Summary of concerns in each temperature range and steel material selection image.
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 | This 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 (about 350°C to 400°C). |
| JIS G4312 SUS310S-HR | It is a fully austenitic heat-resistant stainless steel of the 25Cr-20Ni system. It boasts significantly better oxidation resistance and high-temperature creep strength than general-purpose austenitic steels (such as SUS304), and can be used at temperatures up to 1,100°C to 1,150°C in atmospheric (oxidizing) environments, provided that there are no structural stresses other than its own weight to prevent oxidative wear (however, 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), exceeding the service limits of stainless steels (such as SUS310S), and is applied to critical components in petrochemical plant cracking furnaces, reforming furnaces, power plants, and nuclear-related equipment. |
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.
