Stainless steel is less containing 50% iron and 10.5% chromium, and also added such as nickel, titanium, molybdenum, according to the suspension containing the different components, internal microstructure of the metal is different, it is Martensitic, Ferritic, Austenitic, duplex, precipitation hardening stainless steel. Sanitary seamless stainless steel tube also has different materials.
Generally used in the industry of austenitic stainless steel material more; 0Cr19Ni9 (USU304), 00Cr19Ni11 (USU 304L), 0Cr17Ni12Mo2 (USU 316), 00Cr17Ni14Mo2 (USU 316L), 1Cr18Ni9Ti (SUS 321), etc.. To comply with the GB/T14976-94 "fluid transport seamless steel pipe," the standard, as well as on the surface of the steel pipe surface finish requirements

1, the appearance of quality, no rust, high surface finish, stainless steel manufacturers are not defective, good performance.
2, chemical composition, in general, high nickel content and low carbon content of stainless steel corrosion resistance is better, but the price is relatively high.
3, easy to judge, generally non-magnetic stainless steel (austenitic) than the magnetic stainless steel (ferrite) good corrosion resistance.
The material is divided into stainless steel tube by ordinary carbon steel pipe, steel pipe, alloy structure of high-quality carbon structural tube, alloy steel, bearing steel, stainless steel pipe and to save the precious metals and meet the special requirements of the double metal composite pipe, pipe coating and coating etc.. Stainless steel tube of a wide range of uses, different technical requirements, production methods are also different. The current production of steel pipe outside diameter range 0.1— 4500mm, wall thickness range 0.01 ~ 250mm. In order to distinguish the characteristics, the steel pipe is classified according to the following methods.

Attached to the calculation of stainless steel pipe:
First, the theoretical weight calculation of stainless steel tube: G= (Φ -S) × S× 0.02491
For example: material specifications 57× 304, 3.5× 6 meters in length, the weight of each branch pipe theory: (diameter - thickness) thickness × × theoretical weight per meter = 0.02491 (57-3.5) × 3.5× 0.02491× 6 m =28kg/ branch
Note: 316, 316L, 310S (2520),, 317L and other materials, the theoretical formula of the per meter is G= (Φ -S) × S×
Two, stainless steel round of theoretical weight calculation: G= (Φ × 1/2) 2÷ 40= per meter round weight.
Three, the theoretical weight calculation of stainless steel square tube: [(square tube circumference ÷ 3.1416) -S]× S× (Note: 316, 316L, 2520, 317, 317L with =) = square meters per square meter weight