What Is Cowden Syndrome?

Corten steel, also known as Corten steel, is divided into two categories: Corten A and Corten B, which are the representative steel types of the Cu-P series steel in the United States. They are low-alloy high-strength atmospheric corrosion-resistant structural steels, and are called weathering steels in China.

Colden Steel Pipe

Corten steel, also known as Corten steel, is divided into two categories: Corten A and Corten B, which are the representative steel types of the Cu-P series steel in the United States. They are low-alloy high-strength atmospheric corrosion-resistant structural steels, and are called weathering steels in China.

Chinese name

Colden Steel Pipe

Foreign name

Corten

Classification

Corten A, CortenB

Implementation standards

Implementation standards for finished products

Gas-saving, air preheater, heat exchanger and evaporator in high sulfur-containing flue gas, used to resist condensation and corrosion of sulfur-containing flue gas. Excellent resistance to sulfur ions, hydrochloric acid and other acidic corrosion. Spiral grooved tube is an efficient, economical and mature heat transfer element, which has been widely used in air preheater products of various boilers. Spiral grooved tubes use stellate inner walls and spiral grooves to guide the flow, forcibly disturbing the working fluid in the tube, thereby improving heat transfer efficiency. The heat transfer coefficient of spiral grooved tubes can generally reach 1.25 times of the same diameter light pipe. The use of spiral grooved tubes can improve the efficiency of heat exchange equipment, reduce the amount of steel pipes, and reduce the space occupied by heat exchange equipment. Sex.

One. Implementation standards for finished products:

1. Direct high frequency electric welded steel pipe: GB / T13793-92

2. Structural seamless steel pipe: GB / T8162-2008

3. Acceptance, packaging, marking and quality certificate of steel pipe: GB2102-88

two. Material standard:

1. Corten-A: GB4171-84

2. ND steel pipe (09CrCuSb ie: 09 chrome copper antimony): GB150-98 GB / T6728

3. Spiral groove tube: GB3087-82 or refer to industry standard: DG1017-94

One. Brief introduction about "Cao Deng Steel, ND Steel":

Mainly used in: economizers, air preheaters, heat exchangers and evaporators in high sulfur gas, used to resist condensation and corrosion of sulfur gas. Excellent resistance to sulfur ions, hydrochloric acid and other acidic corrosion.

ND steel is currently the most ideal "sulphuric acid low temperature dew point corrosion resistance" steel. The main evaluation index of 09CrCuSb (ND steel) seamless steel pipe / steel plate (soaked in 70 ° 50% H2SO4 solution for 24 hours) corrosion rate is not greater than 14mg / cm · h, compared with the corrosion resistance of carbon steel, similar steel imported from Japan, and stainless steel, is 1.84 times that of CR1R steel in Japan, 2.97 times that of 1Cr18Ni9 steel, 8.63 times that of Corten steel, and 14.11 times that of Q235B steel Times.

09CrCuSb (ND steel) steel is a hot-rolled steel plate and steel pipe with excellent resistance to sulfuric acid dew point corrosion, which is developed for the purposes of heat exchange in boilers and electric furnaces, smoke pipes, and chimneys. With its superior resistance to sulfuric acid dew point corrosion and a very high price-performance ratio, it is the best material that can completely replace stainless steel and surpass stainless steel (in terms of resistance to sulfuric acid dew point corrosion). ND steel has great economic significance and meets today's high efficiency. Long life. Energy saving . Green concepts such as environmental protection and national development policy orientation.