Emphasis on sulfuric acid dew point corrosion over hydrochloric acid | High-strength corrosion-resistant steel plate for flue gas S-TEN2
For hydrochloric acid dew point corrosion, S-TEN1 is considered, while S-TEN2 is used for sulfuric acid dew point corrosion and flue gas equipment requiring high strength. They are differentiated based on the corrosive environment and the required strength.
S-TEN2 is a corrosion-resistant steel plate for welded structures that has resistance to sulfuric acid dew point corrosion and strength equivalent to SM490A. While S-TEN1 is designed for sulfuric and hydrochloric acid dew point corrosion, S-TEN2 specifically targets sulfuric acid dew point corrosion. COR-TEN is a weather-resistant steel that forms a protective rust layer in the atmosphere, which differs in application from S-TEN2, intended for flue gas equipment where acids condense. 【Recommended for the following issues】 - Rapid corrosion of flue gas ducts - Need for both corrosion resistance and strength - Unclear differences from S-TEN1
basic information
<Reasons for Selection> - Tensile strength of 490 to 610 N/mm² - Yield point of over 325 N/mm² for thicknesses of 16mm or less - Examples of application at wall temperatures of 350 to 500℃ Hot-rolled steel plates have a thickness of 1.6 to 25.4mm. Kumagai Special Steel offers standard sizes of 1.6 to 12mm in thickness, such as 1219×2438mm, and consultations are available for cutting, bending, machining, and welding. Please provide the exhaust gas temperature, wall temperature, and the presence of sulfuric or hydrochloric acid when downloading the catalog or making inquiries.
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Model number/Brand name
S-TEN2 | Made in Japan Steel | Sulfuric Acid and Hydrochloric Acid Dew Point Corrosion Resistant Steel Plate
Applications/Examples of results
In plants that use coal and oil as fuel, as well as in waste incineration facilities, sulfuric acid condenses from exhaust gases containing sulfur oxides, and it is used in equipment where material loss progresses. In the case of Nippon Steel's application, S-TEN2 is set in the cooling tower front duct with wall temperatures of 350 to 500°C. In cooling towers and exhaust ducts, sulfuric acid dew point corrosion is the main concern, and S-TEN2 is a candidate when higher strength than S-TEN1 is required for structural materials. On the other hand, for equipment where hydrochloric acid dew point corrosion occurs due to low exhaust gas temperatures or in hydrochloric acid pickling tanks, please select including S-TEN1. COR-TEN is a steel material that suppresses corrosion progression with protective rust on the surface against atmospheric corrosion in structures such as bridges and buildings. In environments where acid condenses, do not simply replace it with the name weather-resistant steel; confirm the type of acid, concentration, wall temperature, and retention of liquid or dust. When switching to S-TEN2, consider joint specifications that include dedicated welding materials and structures that facilitate drainage. For wall temperatures above 500°C, high-temperature and low-concentration non-equilibrium sulfuric acid, and weakly acidic or neutral liquids, please confirm suitability individually.
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| Model number | overview |
|---|---|
| S-TEN2 | Made in Japan Steel | Sulfuric Acid and Hydrochloric Acid Dew Point Corrosion Resistant Steel Plate | - Tensile strength 490–610 N/mm² - Yield point over 325 N/mm² for thicknesses up to 16mm - Application examples at wall temperatures of 350–500°C Hot-rolled steel plates have a thickness of 1.6–25.4mm. Kumagai Special Steel offers standard sizes such as 1.6–12mm thickness and 1219×2438mm, and we can assist with cutting, bending, machining, and welding. Please provide exhaust gas temperature, wall temperature, and the presence of sulfuric or hydrochloric acid, and download the catalog or contact us for inquiries. |
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