S-TEN for the ducts/casing around the flue gas desulfurization unit and cooling tower.
S-TEN1, S-TEN2 / Nippon Steel brand sulfuric acid and hydrochloric acid dew point corrosion-resistant steel
To areas of corrosion where rapid cooling, acid mist, and drainage overlap. Consider material selection and liquid management together.
In front of and behind the flue gas desulfurization device and cooling tower, rapid cooling of exhaust gases, sulfuric acid mist, unvaporized droplets, and low pH drains can overlap, leading to localized severe corrosion. The state of the liquid adhering to the wall cannot be determined by gas temperature alone, and the corrosion environment can vary significantly depending on the location within the equipment. For the casing and duct of the cooling tower, as well as the exhaust stack and afterburner duct of the flue gas desulfurization device, S-TEN1 and S-TEN2 are considered as candidates. Please check for degradation of the spray nozzles, mist intrusion, pH and retention of the drain, and the flow of cleaning water. Since the corrosion rate of S-TEN may increase sharply under conditions where cleaning water continuously flows over the wall and becomes low pH liquid, comparisons will include stainless steel and linings.
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basic information
- Localized thinning occurs in the ducts before and after the cooling tower and desulfurization equipment. - I would like to organize the application range of S-TEN, stainless steel, and lining. - Please cut and fabricate the replacement casing and duct from the drawings. Example of nominal plate thickness in the catalog: Cooling tower casing and duct 4.5–9 mm, exhaust duct of the flue gas desulfurization unit 3.2–6 mm. The verification items include mist/droplets, pH, acid concentration, wall temperature, drain, flow rate, cleaning conditions, nozzle condition, and environment during shutdown. 【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. - Reduces processing costs compared to stainless steel. 3. Points for material selection - Stainless steel alternatives are possible in dew point corrosion environments. - Total cost reduction including initial costs and processing fees. - Contributes to the longevity of equipment and reduction of maintenance costs.
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P3
※Kumagai Special Steel has the largest inventory of S-TEN steel and has established a system for immediate delivery, including cutting and processing, so it takes about a week depending on the lot. Additionally, for special specifications or large lots, it may take longer. Please contact us by 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 valued for its ability to maintain 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 auxiliary 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 replacing 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, making it a highly practical material.
Detailed information
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S-TEN Steel Usage Explanation
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 in accordance with 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 characteristics in corrosion resistance and strength maintenance 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.
