In the industrial area of electric power, metallurgy and petrochemical, the main fuel of flue gas treatment system of coal or heavy oil, such as boiler low temperature part of the air preheater and economizer, chimney and flue desulphurization device, etc., generally will have higher sulfur content in fuel, sulfuric acid formed under the dew point temperature and corrosion problem, this is called "the sulfuric acid dew point corrosion" phenomenon.
Unlike ordinary atmospheric corrosion, not only subjected to ordinary carbon steel corrosion, the corrosion and make stainless steel corrosion, so great harm.With high sulfur content fuel boiler smoke contains SO2 and SO3, they combine with moisture in the flue gas generating sulfurous acid and sulfuric acid, and condensation on the low temperature of boiler components, cause the sulfuric acid dew point corrosion.Made of carbon-steel boiler parts in low temperature, due to the sulfuric acid dew point corrosion resistance is very poor, severe corrosion and short service life, therefore, the research, development and use of the sulfuric acid dew point corrosion resistant steel to improve the low temperature steel sleeve chimney, boiler parts service life has very important significance.1. The cross-bar of the shoddy steel pipe is thin and low, and the phenomenon of unsatisfactory filling often occurs. The reason is that the manufacturer has to achieve large negative tolerances, the amount of reduction in the first few passes of the finished product is too large, the iron type is too small, and the hole type is not full. 2.The shoddy steel pipe is elliptical in cross-section because the manufacturer has to reduce the amount of material in front of the roll in order to save material. The strength of this rebar is greatly reduced, and it does not meet the standard for rebar size.
3.The composition of high-quality steel is even, the tonnage of the cold shears is high, and the end face of the cutting head is smooth and neat, and the inferiority of the material due to poor quality is often due to the phenomenon of falling meat on the end surface of the cutting head, ie unevenness and no metallic luster. Moreover, due to the lack of cut-to-size products from manufacturers of inferior and inferior products, big ears will appear at the head and tail.
https://www.tnppgi.com/product/hdgi-coil-alu-zinc-coil/hdgi-alu-zinc-coil.html
Unlike ordinary atmospheric corrosion, not only subjected to ordinary carbon steel corrosion, the corrosion and make stainless steel corrosion, so great harm.With high sulfur content fuel boiler smoke contains SO2 and SO3, they combine with moisture in the flue gas generating sulfurous acid and sulfuric acid, and condensation on the low temperature of boiler components, cause the sulfuric acid dew point corrosion.Made of carbon-steel boiler parts in low temperature, due to the sulfuric acid dew point corrosion resistance is very poor, severe corrosion and short service life, therefore, the research, development and use of the sulfuric acid dew point corrosion resistant steel to improve the low temperature steel sleeve chimney, boiler parts service life has very important significance.1. The cross-bar of the shoddy steel pipe is thin and low, and the phenomenon of unsatisfactory filling often occurs. The reason is that the manufacturer has to achieve large negative tolerances, the amount of reduction in the first few passes of the finished product is too large, the iron type is too small, and the hole type is not full. 2.The shoddy steel pipe is elliptical in cross-section because the manufacturer has to reduce the amount of material in front of the roll in order to save material. The strength of this rebar is greatly reduced, and it does not meet the standard for rebar size.
3.The composition of high-quality steel is even, the tonnage of the cold shears is high, and the end face of the cutting head is smooth and neat, and the inferiority of the material due to poor quality is often due to the phenomenon of falling meat on the end surface of the cutting head, ie unevenness and no metallic luster. Moreover, due to the lack of cut-to-size products from manufacturers of inferior and inferior products, big ears will appear at the head and tail.
https://www.tnppgi.com/product/hdgi-coil-alu-zinc-coil/hdgi-alu-zinc-coil.html
コメント