Harbin Shangzhi 35crmo seamless steel pipe drives the development of the industry: Lh--the gauge length after the sample is broken, mm; L0--the original gauge length of the sample, mm. The new product Harbin Shangzhi guide plate distance to the roll distance ratio determines the ovality of the rolling stock in the deformation zone, and the ovality in turn affects the capillary quality, bite conditions, axial slip, perforation speed, diameter expansion, rolling And capillary size. In particular, the effect on the quality of the capillary tube (perforated alloy steel pipe) is more obvious. The greater the ovality, the greater the possibility of cracks on the inner surface of the capillary tube, and the greater the possibility of early cavity formation. Economic management encyclopedia knowledge of how many seamless pipes are well classified in Changsha-hot rolled, cold rolled, cold drawn, pipe, pipe jacking seamless steel pipe (GB / T8162-199 is used for general structure and mechanical structure Seamless steel pipe. Harbin Shangzhi 35crmo seamless steel pipe drives the development of the industry for mechanical structures, hydraulic equipment, automotive parts, steel casing. Good packaging strategy
Harbin Shangzhi 35crmo seamless steel pipe drives the industry to develop cold drawn products with high precision and good surface quality. (Seamless steel tubes for gas cylinders). Mainly used for all kinds of gas. Its representative materials are 37Mn, 34Mn2V, 35CrMo, and so on. The calculation formula of the pitch value of Harbin Shangzhi capillary tube leaving the roll point is T = π / 2 × η0 / ητ × DB × tgβ5 What is the ratio between the guide disc speed and the axial speed of the roll? Sincere service To achieve the desired effect of rust removal, you need to choose abrasives, single-layer epoxy, layer or polyethylene according to the hardness of the alloy tube surface, the original degree of rust, the required surface roughness, and the type of coating. The coating, in order to achieve the desired rust removal effect, requires the use of a mixed abrasive of steel grit and steel shot. Because the steel shot has the effect of strengthening the steel surface, the steel grit has the effect of etching the steel surface. The basic principle of adjustment is that the capillary geometry meets the requirements of the tube rolling unit, the wall thickness is uniform and the internal and external surfaces are good. Welcome to call Diqing guide plate for axial adjustment, this method is not commonly used. Because the length of the guide plate during perforation is shorter than that of the guide plate, in order to reduce the ovality of the tail of the capillary tube, the centerline of the guide plate is moved backwards a bit during the design stage of the perforator. The distance moved backwards depends on the size of the unit, generally within 30 mm. Harbin Shangzhi 35crmo seamless steel pipe drives the industry to develop metal materials with yield phenomenon. The stress at which the specimen can continue to stretch without increasing the force during the tensile process (known as the yield point). If the force drops, the upper and lower yield points should be distinguished. Single upper yield point (σsu) of the yield point: the large stress before the first drop in the specimen yield; lower yield point (σsl): when the initial transient effect is not taken into account, Harbin Shangzhi rectangular tube, small stress during the yield stage . Application process The exit cone angle of the roll is between 3 and 40, and Harbin Shangzhi 42crmo seamless steel pipe depends on the diameter expansion of the billet. The larger the diameter expansion, the larger the angle. Online consultation
Harbin Shangzhi 35crmo seamless steel pipe industry promotes the development of welded steel pipes. The blanks used are steel plates or strip steels, which are divided into furnace welded pipes, electric welded (resistance welded) pipes and automatic arc welded pipes due to different welding processes. There are two types of welded pipe: straight seam welded pipe and spiral welded pipe. Because of its end shape, it is divided into round welded pipes and special-shaped (square, flat, etc.) welded pipes. Welded pipes are divided into the following varieties due to their different materials and uses: (welded steel pipes for low-pressure fluid transportation). Mainly used for conveying water, gas, air, oil, heating water or steam and other low pressure fluids and other purposes. Its representative material is: Q235 steel. Installation requires cold rolled (drawn) steel pipes. Mainly good process resources. The principle of palladium tube purification of hydrogen is to pass the hydrogen to be purified to the side of the palladium tube at 300-500 ° C. Hydrogen is adsorbed on the palladium tube wall due to the 4d electrons of palladium. The layer lacks two electrons. It can form an unstable chemical bond with hydrogen (this reaction of palladium and hydrogen is reversible). Elimination of hydrogen embrittlement under the action of palladium reduces the amount of hydrogen permeation in the T22 alloy steel pipe. High strength / Pickling of high hardness steel T22 alloy steel pipe, because pickling can exacerbate hydrogen embrittlement. When removing rust and scale, try to use sand blasting. If the T22 alloy steel pipe with Rockwell hardness equal to or greater than HRC32 is used for pickling, you must ensure that the T22 alloy steel pipe is immersed in acid during the pickling process. No longer than 10 minutes. The concentration of the acid solution should be reduced as much as possible, and the parts should be immersed in acid for less than 10 minutes. When removing oil, use chemical degreasing methods such as detergent or solvent degreasing to reduce the amount of hydrogen permeation. Chemical degreasing, cathode first, anode first, high-strength T22 alloy steel pipe is not allowed to use the cathode to degrease the oil; during the heat treatment, the dripping amount of methanol and propylene is strictly; when plating, alkaline plating solution or high current efficiency plating solution Less hydrogen infiltration. Process Vacuum quenching Vacuum quenching furnaces are divided into oil quenching and gas quenching according to cooling, and are divided into single-chamber and double-chamber according to the number of work stations. Harbin Shangzhi 8163 seamless steel tubes and 904 mountain \ weird are periodic operation furnaces. The vacuum oil quenching furnace is double-chambered, with an electric heating element in the rear chamber and an oil tank under the front chamber. After the workpiece is heated and insulated, it is moved into the front chamber. After closing the middle door, fill the front chamber with inert gas to about 66% 26times; 10 ～ 01% 26times; 10 Pa (200 ～ 760mm column), and then oil. Oil quenching easily leads to surface deterioration. Due to the large surface activity, a significant thin layer of carburization can occur under the action of a short-term high-temperature oil film. In addition, the adhesion of carbon black and oil on the surface is not conducive to simplifying the heat treatment process. The development of vacuum quenching technology mainly lies in the development of air-cooled quenching furnaces with excellent performance and a single station. Ranking high-quality carbon structural steel hot rolled or cold rolled (dial) seamless steel pipe. Mainly use 20 steel, in addition to ensure the chemical composition and mechanical properties to do hydraulic tests, crimping, flare, flattening and other tests. Hot rolling is delivered in the hot-rolled state, and cold rolling (dial) is delivered in the heat-treated state. Features edited outer diameter is smaller.