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2024年 11月 21日｜｜comment(-)

Causing uneven wall thickness is thick-walled steel spiral puncher rolling centerline errors

Causing uneven wall thickness is thick-walled steel spiral puncher rolling centerline errors, two rolls of varying inclination or former head pressure adjustment amount is too small and so causes uneven, generally along the full length of the spiral steel pipe like distribution. The main measures are adjusted puncher rolling centerline so that the roll angle of the two are equal, according to the given parameter adjustment rolled sheet rolling machine.

Straight uneven wall thickness reason is pre-worn saddle height adjustment mandrel inappropriate to wear when exposed to certain pre-mandrel side of the capillary, resulting in capillary contact surface temperature drop too fast, resulting in uneven thickness even pull concave defects. Even rolling the roller gap is too small or too large. Rolling machine centerline deviation. Single, double rack uneven reduction will cause the direction of the ultra-thin single stand pipe (thick), two-rack direction thick (thin) the linear symmetry bias. The main measures are adjusted pre-worn saddle height mandrel, the mandrel and the guarantee of the capillary. Replace the hole and rolled specifications should roll gap measure, the actual roll gap and rolling tables consistent. Optical centerline of the device to adjust the rolling, rolling machine centerline must be corrected when the annual overhaul.

From the economic considerations, to meet the engineering requirements while minimizing costs, but often the result is easy to form the appearance of a small selection of the many varieties of pipe fittings in general, which is not conducive to the construction site materials management, regulation and design changes N06625 Inconel tube manufacturers needed material substitution and so on. Therefore, the choice of pipe fittings, should be integrated security and economy, minimize pipe varieties appropriate. In addition, the construction site conditions, the level of construction, fittings procurement cycle and other factors, it should cause the necessary attention in the selection of the tube. Under the circumstances, we should also consider strengthening fittings, as well as the possibility of miter bend small diameter tube bending and other field.Head, tail tube wall thickness of the front because of uneven cut slope, bending through the large, tube-centering holes errors could easily lead to uneven wall thickness of the head seamless steel pipe. Perforation extension coefficient is too large, roll speed is too high, rolling instability. Puncher cast steel capillary instability could easily lead to the tail of uneven thickness. Measures to check the quality of the tube to prevent the tube front cut slope, depressed volume, replacement or repair should be corrected pass-centering holes. A lower perforated speed to ensure the stability and uniformity of the wall thickness of the rolled hair. When the roll speed adjustment, matching the guide plate is also adjusted accordingly.

2022年 01月 18日｜ stainless steel fitting｜Comment(0)

The development of all kinds of pipes is different

In building materials industry, the development of all kinds of pipes is different, because of its own characteristics different, the China Custom Stainless Steel Welded Pipes Suppliers connection between the pipes also has certain distance.Square steel tube is one of many pipes in the building materials industry.It's formed after strip by processing, all kinds of characteristics of steel pipe needs you to understand, but in the building materials industry, all kinds of pipes to carry out the situation is different, because of the characteristics of itself, the connection between the pipe and there is a certain distance. Actually the raw of materials such as ASTM A53 Seamless Steel Pipe connection, is about steel pipe storage needs certain conditions.
First of seamless steel pipe production technology is mainly done through tension reducing mill, the tension reducing process is the hollow of the parent metal without mandrel continuous rolling process.On the premise of guarantee the quality of mother tube welding, welding tube tension reducing process is to welded pipe whole heated to 950 degrees Celsius above, then through the tension reducing mill (tension reducing mill a total of 24 times) rolled into a variety of outside diameter and wall thickness of the finished tube, adopt the process of hot rolled steel pipe have substaintial distinction with ordinary high-frequency welded pipe, through the heating furnace after its weld and the microstructure and mechanical properties of matrix can achieve the same in addition, through many times of tension reducing mill rolling and automatic control made the size precision of steel tube (especially the tube roundness and wall thickness accuracy) is superior to the same kind of seamless tube.
In storage of seamless steel tube, the first demand picking the right place, we need think about many external factors, corrosion of steel pipe and so on, so the site must be cleaned clean, dry and ventilated, harmful gas present, seamless steel tube is not present, weeds and other debris to keep clear of in time, to keep the steel surface clean.If the acid base salt in the warehouse is easy to respond to the steel pipe, make steel pipe corrosion, so try to be able to be able to cut, don't let it touch.If you think about the higher price metal, you can think about the very good reservation in the warehouse.According to the geographical condition, there is a sealed warehouse, but the ventilation is outstanding.The requirements of the steel pipe stack are stable and secure under the condition of the stacking, and the stacking of steel pipe and steel pipe is in order.Different types of steel tube materials shall be piled up separately to prevent mixing and corroding.There must be a wooden mat or a stone, and the crib is slightly tilted in order to drain, and notice that the material is laid flat to prevent bending deformation.

2021年 12月 23日｜ stainless steel fitting｜Comment(0)

Former method is to use oblique roll bad perforated tube

Seamless steel pipe production methods is broadly divided into cross rolling and extrusion method. Former method is to use oblique roll bad perforated tube, and then rolling it extends. This method of production speed, but higher on the tube workability stainless steel fitting requirements, mainly for the production of carbon steel and low alloy steel pipes. After the rule is puncher billet or ingot will be perforated, and then into a pipe extruder, this method is lower than the efficiency of cross rolling method is suitable for the production of high-strength steel pipe.

Cross rolling method and extrusion billet or ingot must first heating, production of hot-rolled steel tube called. Produced by thermal processing of the cold pipe may sometimes be needed then. Cold working in two ways: one is the method of drawing, the pipe is drawn through a die to extubation, the steel pipe is tapered, elongated; Another method is to cold rolling, it is the brother of the invention Mengneisiman The cold rolling mill used in the method. A seamless steel tube cold working of steel can be improved dimensional accuracy and finish machining, and the like to improve the mechanical properties of the material. Hot-rolled and cold drawn thermal processing is cold. The main difference: in the hot rolling temperature above the recrystallization rolling, cold rolling at a temperature below the recrystallization rolling cold rolling and sometimes there will be heated, but the temperature is relatively low, as it will produce cold rolled after processing. hardening, if required for the molding material is relatively high, but also for annealing of cold-rolled and hot-rolled plates or profiles generally, and wire drawing is generally cylindrical cross-section. Another hot-rolled sheet is generally higher alloy content, high strength steel, and cold-rolled carbon steel is a low alloy by cold rolling can improve strength, ensure the surface quality of the material. Cold drawn seamless steel pipe and hot-rolled seamless steel tubes of different distinction and plate. Seamless steel pipe manufacturing process is different because it is divided into hot-rolled (extrusion) Seamless two seamless and cold drawn (rolled).

Cold drawn (rolled) pipe is divided into two circular pipe and shaped tube: cold drawn steel tubes generally require multiple drawing between each drawing must be appropriate to stress annealing, to ensure a smooth next drawing proceed. From the appearance of cold-rolled seamless steel tubes tend to be small-diameter, hot-rolled seamless steel tubes tend to be large diameter. Accuracy than hot-rolled seamless steel cold-rolled seamless steel pipe, hot-rolled seamless steel pipe price is also higher than. Generally smaller diameter cold drawn seamless tubes, mostly in 108mm or less, especially precision cold drawn seamless pipe diameter is very high, cold drawn seamless pipe lengths are generally shorter than hot-rolled seamless pipe. Cold drawn seamless pipe wall thickness aspect than hot-rolled seamless uniform.

2021年 12月 02日｜ stainless steel fitting｜Comment(0)

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