Many variable factors represent medium erosion characteristics, namely chemical products and their concentration, atmospheric conditions, temperature, time, so if do not understand the exact nature of the medium, to make use of materials, choice of materials is difficult. However, the following guidelines can be used to select materials for structural steel pipes:

304 steel throughout the material utilization. In buildings can withstand general corrosion, can withstand food processing etching medium (containing concentrated acid but high temperature and chloride content may appear erosion), organic compounds, dyes, and across a variety of inorganic compounds can resist.

304L steel(low carbon) with good resistance to nitric acid, and durable medium temperature and concentration of sulfuric acid, used as a liquid throughout the gas tank, used for cryogenic equipment (304N steel), the rest of the consumer appliance products, kitchen equipment, hospital equipment, transport tools, water handling equipment.

316 steel contains a nickel slightly more than 304 steel, and contains 2% ─3% molybdenum, corrosion resistance than Type 304 steel, is biased in favor of special points of erosion caused by chloride media. 316 steel has been used as a development sulfite pulp machine because it is a durable sulfate compound. Moreover, its use has been enlarged to handle a lot of chemical products in the processing industry.

317 steel containing 3% -4% molybdenum (high levels in this series are also obtained), and contains more than 316 steel types of chromium, has a higher resistance to pitting corrosion and crevice corrosion performance.

430 steel lower than the 304 steel alloy content, is used in a warm atmosphere decorated with highly polished uses, can also be used nitric acid and food processing equipment.

410 steel has three generalized use of stainless steel in the lowest alloy content, you need strength and corrosion resistance with high load-bearing components used, such as solid pieces. 410 in a warm atmosphere, water, gas, and chemical products in the media many moderate corrosion resistance.

2205 steel than the 304 steel and 316 steel superior, because the structure of his pipe chloride stress corrosion cracking has a high strength to resist.

The above are the types of materials used for structural steel pipes and the selection criteria.