steel pipe

　　1: Thick-walled seamless steel pipe castability (castability): refers to the ability of metal materials to obtain qualified castings by casting. Casting properties mainly include fluidity, shortening and segregation. Fluidity refers to liquid metal filling molds. Capability, shortening refers to the degree of volume shortening when the casting is condensed. Segregation refers to the non-uniformity of the chemical composition and arrangement of the metal during the cooling and condensation process due to the difference in crystallization. 　　2: Thick wall seamless steel tube forgeability: refers to the metal material can change the shape without cracking during pressure processing. It can be hammered, rolled, stretched, twisted in hot or cold state. Pinch and other processing. The quality of forgeability is primarily related to the chemical composition of metal materials. 　　3: Thick-walled seamless steel pipe machinability (cuttability, machinability): refers to the ease with whic...

　　The major making techniques of seamless steel pipes are as follows. 　　1. Plug Rolling Production 　　Production equipments consist of punching machine, automatic pipe rolling mill, reeling mill, sizing mill and the reducing mill. Pierce the round tube into the hollow of thick walled tube, and the axis of two rollers and rolling lines form a slant angle. in recent years the slant angle has increased from 6 ° ~ 12 ° to 13 ° ~ 17 °, promoting the punch speed. Use secondary perforation to reduce the thickness of the hollow billet walls when produce structural steel pipe of more than 250mm diameters. The development of new technology also has been made, which strengthened the perforation process and improve the quality of the capillary. 　　2. Continuous Rolling Production 　　Production equipments consist of punching machine, continuous rolling mills, and tension reduction mills. Pierce round base into hollow billet and then insert the mandrel, through continuous rolling of 7 ~ 9 two-...

　　A179 seamless steel pipe is widely used in industries such as petroleum, chemical, medical, food, light industry, machinery, instrument, include industrial pipeline and mechanical structure parts, etc. 　　This is an effective way of metal corrosion, the use of the main features are the following: 　　1. ASTM A179 cold drawn seamless pipe manufacturers with thick dense dense zinc layer covered in the cold drawn seamless tube surface, it can avoid cold drawn seamless tube matrix and any contact with the corrosion solution to protect the steel matrix from corrosion. In the general atmosphere, the surface of the zinc layer to form a layer of thin and dense zinc oxide surface, it is difficult to dissolve in water, so the steel matrix plays a protective role. If zinc oxide and other components of the atmosphere produce insoluble zinc salt, the anti-corrosion effect is more desirable. 　　2. With iron - zinc alloy layer, combined with dense, and with the unique anti-corrosion in the marin...

　　Reducing flanges are designed for when there is a change in the pipe size. A reducing flange consists of a flange with one specified diameter having a bore of a different and smaller, diameter. Except for the bore and hub dimensions, the flange will have dimensions of the larger pipe size. 　　Weld Neck and Slip-On: Connect the flange sides that match the higher diameter of pipe and complete welding process. Repeat the welding process for the smaller size of pipe on the other side of the reducing flange. Now both sizes of pipes are connected through the reducing process. Take enough care to ensure that the inside diameters of the pipes are properly aligned with the ID of the Flange on both sides. 　　Threaded Flange: First connect any one size of pipe by threading to one side of the flange. Make sure that the pipe is inserted to reach the required depth inside the flange. Repeat the same process for the other size of the pipe. 　　In high pressure and temperature applications, weldin...

　　 Stainless steel pipe features contain several aspects and one of the most outstanding one is that it is stainless and cannot be ruined by the factors that affect most of the iron materials. Stainless steel will not be corrupted by the moisture and humid like the iron pipe and it is of better strength and hardness. Among the many stainless steel pipe features, this one is quite unique and it is contributed by the component of stainless steel, which is carbon. Black steel pipe is not stainless steel pipe, for the material form up black steel pipe is not stainless steel but a new kind of plastics. So black steel pipe features are not quite the same like stainless steel features. Black steel pipe is also against moisture and humid weather, but is much softer than the stainless steel pipe. Since most plastic cannot reach to the same hardness level as stainless steel does. 　　One of many stainless steel pipe features is that it is lighter than other pipes, which is also the feature of b...

　　We often say that the heat expansion seamless pipe refers to a steel pipe with a relatively low density but a strong shrinkage. (Seamless steel pipe) can be simply referred to as a thermal expansion pipe. A roughing finishing process for expanding the diameter of a pipe by a cross-rolling method or a drawing method. In a relatively short period of time, the steel pipe is thickened, and non-standard, special-type seamless pipes can be produced, and the cost is low, and the production efficiency is the development trend in the international rolling pipe field. 　　The two-step propulsion pipe expanding machine adopts the taper die expanding technology, the digital intermediate frequency induction heating technology and the hydraulic technology in one machine, with its reasonable process, low energy consumption, low construction, Good product quality, wide range of raw materials and product specifications, flexible, easy to change, low-input production batch adaptability, replacing the ...

　　Oil and gas valve is widely used in oil and gas industry, gathering and process units. According to production requirement, the valves transported or blocked a variety of gas and liquid media to various containers and process equipment. Oil and gas valves can be divided into general and special valve. The general pipeline valve includes gate valve, ball valve, check valve, butterfly valve, safety valve and so on. Special valve includes slide valve and high temperature butterfly valve in catalytic cracking unit, four-way switch valve and coke blocking valve in delayed coking unit and so on. In addition, the control valve is also very important to device. Control valve working status directly relate to the DCS control system running. Once the control valves fail, the entire control system will not work. 　　The oil and gas valve mainly have the isolation equipment, cut off or connect the pipeline, prevent the reverse flow, adjust and throttle functions. These functions control the syst...

Stainless steel pipe used in many filed, water supply system is one of them. The most common stainless steel pipes used to supply water are 304 seamless stainless tube and 316 stainless steel pipe. They can meet most of the water treatment and transportation requirement. Basically, 304 seamless stainless tube is made of austenitic stainless steel. And 316 stainless steel pipe contains molybdenum element. So 316 stainless steel pipe has a better ability of resisting pitting and crevice corrosion than 304 stainless steel pipe. So knowing how to use stainless steel pipe, especially 304 seamless stainless tube and 316 stainless steel pipe is quite important. If the pipe system needs to use welding method, it is better to use 304L stainless steel pipe or 316L stainless steel pipe which contains low carbon steel or 316i stainless steel which contains titanium. If we use 304 seamless stainless tube and 316 stainless steel pipe, some necessary processing measures should be adopted, such as ...

　　We know that steel pipe surface treatment is one of the key factors determine the service life of the pipeline corrosion, it is a precondition for whether the anti-corrosion layer and steel tube can be combined. It is verified by the research institutions that the life of the coating depends on the quality of coating types, coating quality and environmental factors such as construction. The steel tube surface treatment effects on coating life accounted for about 50%, therefore, we should be strictly accordance with the specification on the coating on the surface of steel pipe requirements, continuously explore and summary, continuously improve steel pipe surface treatment. 　 　1. Cleaning 　　Using solvent and emulsion to clean the steel surface, to remove oil, grease, dirt, lubricants, and similar organic matters, but it cannot remove rust, scale, such as welding flux on the surface of the steel, so only as auxiliary in the anti-corrosion production. 　　 2. Rust cleaning by tools...

　　Differences between ERW steel pipe and HFW steel pipe. 　　The differences of the ERW, HFW welding processes. 　　ERW welding process refers the heat generated by the resistance to current flow that pass through the jointed metals. So a large current is needed to electrify the whole surface of the steel plate or coil to the length of welding. In the ERW welding process, the electric current that pass through the entire conductor is at 50/60 Hz. 　　HFW welding process is not the same case with the high-frequency process, since it’s only a section of the steel metals is heated by the induction of electric coil. High-frequency is generated by either AC or DC current. In these cases, the constant current welding generator and constant voltage high-frequency welding generator are used. 　　Constant current welding machine generates power in 100-800 kHz. In the elder processes, the conversion of 60 Hz, AC current to HF was done by using triode and tank circuits. New welding machine uses ...