， cold drawn tubes， tubes， etc. Hot rolled seamless tubes are produced on the automatic precision tube precision tube rolling mill. The solid tube blank is cut into the required length by removing surface defects， centering on the end face of the perforated end of the tube blank， and then sent to the heating furnace for heating. It is perforated on the piercing machine. At the same time， A cavity is gradually formed inside the pipe blank， which is called the rough pipe， and the diameter is determined by the sizing machine to meet the specification requirements. The continuous pipe mill is more advanced in producing hot-rolled seamless steel pipe. If you want to obtain seamless pipe with smaller size and better quality， Cold rolling and cold drawing must be adopted， or the combination of cold rolling and cold drawing is usually carried out on the roll mill. The seamless pipe is rolled in the annular pass composed of variable section circular hole groove and fixed conical plug. Cold drawing is usually carried out on the single chain or double chain cold drawing machine， that is， the heated pipe blank is placed in a closed cylinder， and the perforated rod and rod move， This method can produce steel pipe with small diameter. In the building materials industry， the development of various pipes is different. Because of their different characteristics， there is a certain distance between pipes. Square pipe is one of many pipes in the building materials industry. It is formed after strip steel treatment. We need to understand the various characteristics of steel pipes. However， in the building materials industry， the development of various pipes is different. Because of their different characteristics， there is a certain distance between pipes. Square pipe is one of many pipes in the building materials industry. It is formed after strip steel treatment. The various characteristics of steel pipe need to be understood by everyone. However， due to the of steel pipe and other raw materials， the storage of steel pipe needs specific conditions.
During the pushing process of spot welding and repair welding elbows， there will be thinning so manufacturers usually use thick spot pipes. If thin raw materials are used， the products produced must be unqualified. Generally， there are about wires thinned. If the technology is not good or the drawn pipe is used， the thickness is significantly lower than the standard.
OstanderThe flattening speed of the sample can be ~ mmin.
Square tubes for petroleum cracking (gb-) are furnace tubes， heat exchangers and pipeline square tubes suitable for petroleum refineries.
Lake Magadi After spraying (throwing) derusting， it can not only expand the physical adsorption on the pipe surface， but also enhance the mechanical adhesion between the layer and the pipe surface. Therefore， spray (throwing) derusting is an ideal derusting method for pipelines. Generally speaking，OstanderHot dip galvanized square pipe， shot blasting (sand) is mainly used for the inner surface treatment of the pipe， and shot blasting (sand) is mainly used for the outer surface treatment of the pipe. Several problems should be paid attention to in derusting by spraying (throwing).
The general delivery length of qb square pipe is mm-mm mostly mm and mm. Qb square tube is allowed to deliver short length and non fixed length products not less than mm， or in the form of interface tube
Reinforcing phases such as reinforcing particles， due to the falling off of the oxide scale of the galvanized square pipe， the metal on the surface of the galvanized square pipe is directly exposed in the air. If a primer is not applied in time， the surface of the galvanized square pipe is easy to rust again， affecting the adhesion of the paint film. I am engaged in all kinds of square tubes， square rectangular tubes， seamless square tubes， galvanized square tubes， galvanized tubes and other materials all year round. I operate in good faith. Welcome to call! As the paint is a time-effective material， the overstock of inventory is easy to expire. Therefore， the main indexes of the paint must be rechecked before use， and the paint can be used only when the results meet the standards.
At the same time， the heating temperature and heating time will also have a great impact on the performance of square tube. The heating of square tube blank is the key process to ensure that the square tube blank has enough plasticity and complete the smooth perforation. If the heating temperature is too high or the heating time is too long， the billet of the square tube will be burned and decarburized， and even the chemical composition of the square tube will be unqualified (unqualified carbon content)， which is easy to cause batch quality problems and seriously affect the product qualification rate.
Square tube for automobile half shaft sleeve (gb-) is a high-quality carbon structural steel and alloy structural steel hot-rolled square tube for automobile half shaft sleeve and drive axle housing.
Supply chain quality managementThe load of impact toughness acting on the parts at a great speed is called impact load. It is specialized in products and renewable resources. Its business includes: square tube， square tube， seamless square tube， galvanized square tube and galvanized tube. The ability of metal under impact load is called impact toughness.
At this time， if the welding wire of the same material is used for spot welding where the thickness is insufficient，OstanderGalvanized iron square pipe，OstanderGalvanized threading pipe manufacturer， it shall be welded to the fixed thickness， ground and sandblasted， and repair welding shall be adopted where there are cracks， even if the steel pipe with another large opening can be made up at one time.
Zinc layer thickness: there is a great difference between cold galvanized square pipe and hot galvanized square pipe in galvanizing process; Cold galvanized square pipes are prone to & ldquo; Electric burning & rdquo; The color of this part is gray and the zinc layer is thick. It is easy to form a current dead angle at the corner resulting in an under current area. The zinc layer at this part is thin， and there is no zinc layer attached to the cold galvanized square pipe. The cold galvanized square pipe has no zinc lump and caking as a whole， and the thickness of the outer wall zinc layer is μ m-μ m. The and outer walls of the hot-dip galvanized square tube are attached with zinc layer， and there will be water marks and a few zinc tumors but the overall zinc layer is thick， and the thickness of the zinc layer on the inner and outer walls of the square tube is -mu; M above. The nature of QB square tube!
special shaped square pipe is the general name of square pipes with other cross-section shapes except circular pipe. According to the different cross-section shape and size of steel pipe， it can be divided into special-shaped square pipe with equal wall thickness (code D)， special-shaped square pipe with unequal wall thickness (code BD) and special-shaped seamless steel pipe with variable diameter (code D) These special-shaped large-diameter qb square tubes are widely used in various structural parts， tools and mechanical parts. Compared with circular tubes， special-shaped tubes generally have large moment of inertia and section modulus， and have large bending and torsion resistance， which can greatly reduce the structural weight and save steel. Square tubes are an indispensable part of construction work
device managementFatigue strength， plasticity and hardness discussed above are indicators of the mechanical properties of metals under static load. In fact， many machine parts work under cyclic load under which fatigue will occur.
Performance index analysis of square tube - strength refers to the performance of metal materials under static load. Since the action modes of load include tension， compression， bending and shear， the strength is also divided into tensile strength， compressive strength， flexural strength and shear strength. There is often a certain between various strengths. Generally tensile strength is used as the basic strength indicator.
Functional index analysis of qb square tube - the load on the machine parts due to the great progress of strength is called the frontal collapse load. The power of destruction of qb square tube under the frontal collapse load is called the frontal collapse toughness.
OstanderOil drilling pipe (yb-) is a square pipe used for internal or external thickening at both ends of oil drilling. Steel pipes are divided into turning wire and non turning wire. Turning wire pipe is connected with joint， and non turning wire pipe is connected with tool joint by butt welding.
， cold drawn tubes， tubes， etc. Hot rolled seamless tubes are produced on the automatic precision tube precision tube rolling mill. The solid tube blank is cut into the required length by removing surface defects， centering on the end face of the perforated end of the tube blank， it rotates and advances continuously under the action of roll and plug， which is called the rough pipe， and then sent to the automatic pipe mill for continuous rolling. After the wall thickness is adjusted by the whole machine， and the diameter is determined by the sizing machine to meet the specification requirements. The continuous pipe mill is more advanced in producing hot-rolled seamless steel pipe. If you want to obtain seamless pipe with smaller size and better quality， Cold rolling and cold drawing must be adopted， or the combination of cold rolling and cold drawing is usually carried out on the roll mill. The seamless pipe is rolled in the annular pass composed of variable section circular hole groove and fixed conical plug. Cold drawing is usually carried out on the single chain or double chain cold drawing machine， that is， the heated pipe blank is placed in a closed cylinder， and the perforated rod and rod move， This method can produce steel pipe with small diameter. In the building materials industry， the development of various pipes is different. Because of their different characteristics， there is a certain distance between pipes. Square pipe is one of many pipes in the building materials industry. It is formed after strip steel treatment. We need to understand the various characteristics of steel pipes. However， in the building materials industry， the development of various pipes is different. Because of their different characteristics， there is a certain distance between pipes. Square pipe is one of many pipes in the building materials industry. It is formed after strip steel treatment. The various characteristics of steel pipe need to be understood by everyone. However， due to the of steel pipe and other raw materials， the storage of steel pipe needs specific conditions.
If the test results of square tubes fail to meet the provisions of product standards， the unqualified ones shall be selected， and double the number of samples shall be taken from the same batch of square tubes for re inspection of unqualified items. If the re inspection results (including any index required by the test of the project) are unqualified， the batch of square tubes shall not be delivered. If the following inspection items fail to pass the preliminary inspection， re inspection is not allowed: A. There are white spots in the low magnification; b. Microscopic.