Executive Standard: ASTM.DIN,JIS,GB
|RODUCT||OUT SIDE DIAMETER||THICKNESS|
|Black Square Steel Pipe||0.47242-1.96852||122-502||0.0118-0.0787||0.3-2.0|
steel pipe stock
steel pipe contains a certain amount of silicon (Si) (generally not more than 0.40%), manganese (Mn) (generally not more than 0.80%, higher up to 1.20%) alloying elements in addition to carbon (C) elements and deoxidation In addition, there are no other alloying elements (except for residual elements). 10# steel pipe must ensure both chemical composition and mechanical properties.
steel grade: 10 steel
steel pipe chemical composition: carbon C: 0.07~0.14" silicon Si: 0.17 ~ 0.37 manganese Mn: 0.35 ~ 0.65 sulfur S: ≤ 0.04 phosphorus P: ≤ 0.035 chromium Cr: ≤ 0.15 nickel Ni: ≤ 0.25 copper Cu: ≤ 0.25
mechanical properties: tensile strength σb (MPa): ≥ 410 (42) yield strength σs (MPa): ≥ 205 (25) elongation δ5 (%): ≥ 25 area shrinkage ψ (%): ≥ 5, hardness: no heat treatment, ≤ 156HB, sample size: sample 25mm
steel pipe heat treatment specification and metallographic organization: heat treatment specification: normalizing, 910 ° C, air cooling. Metallographic organization: ferrite + pearlite.
Steel pipe delivery status: delivered without heat treatment or heat treatment (annealing, normalizing or high temperature tempering). The delivery of the required heat treatment condition shall be indicated in the contract, and the unspecified shall be delivered without heat treatment.
The content of sulfur (S) and phosphorus (P) impurity elements is generally controlled to be less than 0.035%. If the control is below 0.030%, it is called high-quality steel, and the grade should be followed by "A", for example, 20A; if P is controlled below 0.025% and S is controlled below 0.020%, it is called premium grade steel, and its grade should be added after the grade. "E" to show the difference. The content of other residual alloying elements such as chromium (Cr), nickel (Ni), copper (Cu) and the like which are brought into the steel by the raw material is generally controlled to be Cr ≤ 0.25%, Ni ≤ 0.30%, and Cu ≤ 0.25%. Some grades of manganese (Mn) content of 1.40%, called manganese steel.
Steel pipe manufacturer quality assurance
The welded steel pipe is made of steel pipe factory rolled into a tubular steel plate by seam or spiral seam welding. The steel pipe manufacturer is divided into low-pressure fluid conveying welded steel pipe, spiral seam electric welded steel pipe, direct coil welded steel pipe, and electric steel. Welded pipe, etc.
Seamless steel pipes can be used in liquid pressure pipes and gas pipes in various industries. Welded pipes can be used for water pipes, gas pipes, heating pipes, electrical pipes, etc.
Steel pipes are divided into seamless steel pipes and welded steel pipes. In the production process, steel pipe manufacturers wear solid tube blanks or steel ingots into hollow tubes and then roll them into steel pipes of the required size.
The different methods of perforation and rolling are used to form different methods of producing seamless steel tubes. The production process of welded steel pipes is to bend the tube blank (steel plate or strip) into a tubular shape, and then weld the gap into a steel pipe. Different methods of producing welded steel pipes are formed due to the different molding and welding methods used.
Steel pipe manufacturers mainly produce by hot rolling. The extrusion method is mainly used for producing low-plastic high-alloy steel pipes or special-shaped steel pipes and composite metal pipes which are difficult to perforate. Cold rolling and cold drawing processes continue to process hot rolled tubes into small diameter and thin walled steel tubes. The welded steel pipe has a simple process, high production efficiency, low cost, and an ever-expanding variety of products.
A steel having a hollow section that is much longer than the diameter or circumference. According to the cross-sectional shape, it is divided into round, square, rectangular and special-shaped steel pipes; it is divided into carbon structural steel pipe, low-alloy structural steel pipe, alloy steel pipe and composite steel pipe according to the material; it is divided into conveying pipeline and engineering structure according to the purpose. For thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, steel pipes for high-pressure equipment, etc.; steel pipe manufacturers are divided into seamless steel pipes and welded steel pipes according to the production process, of which seamless steel pipes are divided into hot rolling and cold rolling ( Pulled two kinds, the welded steel pipe is divided into straight seam welded steel pipe and spiral seam welded steel pipe.
Steel pipes are not only used to transport fluids and powdered solids, exchange heat, make mechanical parts and containers, but are also an economical steel. The use of steel pipes to manufacture building structure grids, pillars and mechanical supports can reduce weight and save 20-40% of metal, and steel pipe manufacturers can realize mechanized construction. The use of steel pipes to manufacture highway bridges not only saves steel and simplifies construction, but also greatly reduces the area of the protective coating and saves investment and maintenance costs.