In order to improve the corrosion resistance of steel pipes, galvanizing of common steel pipes is stopped. Galvanized pipes are divided into hot-dip galvanizing and electro-galvanizing. Hot-dip galvanizing has thick galvanizing layer, low galvanizing cost and poor lubrication. Oxygen-blowing welded pipe: used as steel-making oxygen-blowing pipe, commonly used small-caliber welded pipe, specifications from 3/8-2 inch eight. If it is made of 08, 10, 15, 20 or 195-Q235 steel strips, in order to prevent corrosion, aluminizing must be stopped.
Weight Coefficient of Galvanized Steel Pipe
公称壁厚mm： 2.0 2.5 2.8 3.2 3.5 3.8 4.0 4.5
Nominal wall thickness mm: 2.02.52.8 184.108.40.206 4.04.5
系数c：1.064 1.051 1.045 1.040 1.036 1.034 1.032 1.028
Coefficient c: 1.064 1.051 1.045 1.040 1.036 1.034 1.032 1.028
The mechanical properties of steel injection is an important index to ensure the ultimate performance (mechanical properties) of steel, which depends on the chemical composition of steel and heat treatment system. In the steel pipe specification, according to different application requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as the high and low temperature properties requested by users are regulated. Steel grades: Q215A; Q215B; Q235A; Q235B
The experimental pressure/Mpa: D10.2-168.3mm is 3Mpa; D177.8-323.9mm is 5Mpa.
Usually said galvanized pipe, the use of galvanized pipe is now gas, heating that kind of iron pipe is galvanized pipe, galvanized pipe as a water pipe, after several years of use, the pipe produced a large number of rust scale, yellow water not only pollutes the sanitary ware, but also mixed with non-lubricating bacteria, rust formed in the water heavy metal content is too high, serious. Harm the health of human body. In the 1960s and 1970s, the prosperous countries in the world began to develop new types of pipes, and gradually banned galvanized pipes. Four ministries such as the Ministry of Establishment of China have also banned galvanized pipes since 2000. At present, galvanized pipes were seldom used in cold pipes of newly built residential areas, and galvanized pipes were used in hot pipes of some residential areas.
Technical Requirements for Galvanized Pipes to Arrive
1. Brand and Chemical Constituents
The grade and chemical composition of galvanized pipe steel shall conform to the grade and chemical composition of the black pipe steel specified in GB 3092.
2. Manufacturing methods
The manufacturing method of black pipe (furnace welding or electric welding) is chosen by the manufacturer. Hot dip galvanizing is used for galvanizing.
3. Thread and pipe fittings
3.1 带螺纹交货的镀锌钢管，螺纹应在镀锌后车制。螺纹应契合YB 822的规则。
3.1 For galvanized steel pipes delivered with threads, threads shall be made after galvanizing. Threads shall conform to the rules of YB 822.
3.2 钢制管接头应契合YB 238的规则；可锻铸铁管接头应契合YB 230的规则。
3.2 Steel pipe joints shall conform to the rules of YB 238; malleable cast iron pipe joints shall conform to the rules of YB 230.
Mechanical property of steel is an important index to ensure the ultimate performance (mechanical property) of steel, which depends on the chemical composition and heat treatment system of steel. In the steel pipe specification, according to different application requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as the high and low temperature properties requested by users are regulated.
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