S-TEN for dew point corrosion prevention in dry-type dust collectors and air preheaters.
S-TEN1, S-TEN2 / Nippon Steel brand sulfuric acid and hydrochloric acid dew point corrosion-resistant steel
Corrosion due to dust accumulation and temperature cycles at the acid dew point. Extending the lifespan of casings, dust collection plates, and elements.
In dry-type dust collectors and air preheaters, the casing and ducts become cooler than the exhaust gases, leading to repeated temperature changes that cross the acid dew point. Furthermore, when dust absorbs sulfuric acid and becomes hygroscopic, corrosion can progress even during shutdowns or low-load operations. For the casing, ducts, and dust collection plates of dry-type dust collectors, as well as the basket case and elements of air preheaters, S-TEN1 and S-TEN2 are considered as candidates. In tube-type air preheaters, where it is prone to constant dew point conditions, S-TEN1 steel pipes are shown as applicable examples. The temperature of the steel plates at each location, the properties and accumulation of dust, cleaning methods, and the number of start-stop cycles should be checked, and a combination of plates, thin sheets, steel pipes, and dedicated welding materials should be used.
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basic information
- I want to reduce the corrosion of dust collector casings and dust collection plates, as well as the frequency of replacements. - I want to select materials that match the temperature cycles of air preheaters and dew point corrosion. - I want to arrange for thin plates, thick plates, steel pipes, and welding materials all together. Example of plate thickness from the catalog: Dry dust collector 1.2 to 8 mm, air preheater element 0.6 to 6 mm, tube-type pipe 0.6 to 3.5 mm. Please ensure a structure that prevents dust accumulation and allows for cleaning and inspection. Continuous washing and low pH conditions for wet dust collectors require separate evaluation. 【Basic Information】 1. Main specifications and characteristics - Steel type classification: Acid-resistant steel plate for sulfuric acid and hydrochloric acid dew point corrosion - Representative grades: S-TEN1 / S-TEN2 - Corrosion resistance: Suitable for sulfuric acid and hydrochloric acid dew point corrosion - S-TEN2 has enhanced corrosion resistance performance at high temperatures compared to S-TEN1 2. Features of processing and construction - Good weldability, cutability, and bendability - Compatible with gas and laser cutting - Lower processing costs compared to stainless steel 3. Points for material selection - Stainless steel alternatives are possible in dew point corrosion environments - Reduction of total costs including initial costs and processing fees - Contributes to the longevity of equipment and reduction of maintenance costs
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※Kumagai Special Steel has the number one inventory of S-TEN steel and has established a system for immediate delivery, including cutting and processing, so it usually takes about a week depending on the lot. For more specialized specifications or large lots, it may take longer. Please contact us via email or phone for inquiries!!
Applications/Examples of results
S-TEN steel is a corrosion-resistant steel plate designed to withstand sulfuric acid and hydrochloric acid dew point corrosion environments, and it has a proven track record under harsh corrosion conditions. It is highly regarded for maintaining workability similar to ordinary steel while achieving both extended equipment lifespan and cost reduction. 1. Main Applications and Practical Examples - Exhaust gas treatment equipment: flues, ducts, dust collectors - Chemical equipment: pickling tanks, reaction vessels, piping components - Environmental equipment: incinerator auxiliary equipment, exhaust gas treatment devices - Energy-related: boiler peripheral equipment, support structures - Industrial equipment: structural components requiring corrosion resistance 2. Evaluation Points in Practical Use - High corrosion resistance against sulfuric acid and hydrochloric acid dew point corrosion - Reduction in material and processing costs by substituting stainless steel - Easy construction with welding and workability equivalent to ordinary steel 3. Expected Future Market Areas - Demand for updating aging environmental and exhaust gas equipment - Plant equipment focusing on cost optimization - Industrial infrastructure sectors seeking long lifespan and low maintenance S-TEN steel is expected to see expanded adoption in fields where both corrosion resistance and economic efficiency are required.
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S-TEN Steel Application Examples
Line up（2）
| Model number | overview |
|---|---|
| S-TEN1 (a standard grade of sulfuric acid and hydrochloric acid dew point corrosion-resistant steel plate developed by Nippon Steel Corporation) | This is a steel material with excellent dew point corrosion resistance in normal to medium temperature environments (below approximately 300°C). It is designed to meet the mechanical properties equivalent to SM400A of JIS G3106 under JIS standards, exhibiting processing and weldability comparable to ordinary steel while demonstrating strong resistance to acid and gas dew point corrosion. |
| S-TEN2 (a corrosion-resistant steel plate developed by Nippon Steel for sulfuric acid and hydrochloric acid dew point corrosion, suitable for use in higher temperature environments) | This specification is suitable for use in high-temperature environments (approximately 300 to 500°C). According to JIS standards, it is equivalent to JIS G3106 SM490A, possessing higher tensile strength and mechanical strength than S-TEN1, and demonstrating excellent properties in corrosion resistance and strength retention at high temperatures. |
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**Expanding Our Global Steel Business!** We support both **CIF and EX Works (EXW)** terms. **Delivering Japanese Specialty Steel to the World.** 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.
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