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Cold drawn profiled steel pipe


  • Classification: Cold drawn profiled steel pipe
  • Number of hits: twenty-eight
  • Update Date: September 16, 2019
    Product description of cold drawn profiled steel pipe
        Specializing in the production and sales of hexagonal steel pipe, special-shaped steel pipe, elliptical pipe, special-shaped seamless steel pipe, cold-drawn special-shaped steel pipe can be customized according to customer requirements. Cold drawn special-shaped steel pipe is the general name of seamless steel pipe with other cross-section shapes except round pipe. According to the shape and size of steel pipe section, it can be divided into equal wall thickness cold drawn special-shaped steel pipe (Code: D), unequal wall thickness cold-drawn special-shaped steel pipe (Code: BD), variable diameter cold-drawn special-shaped steel pipe (Code: BJ)
    It is economic section steel pipe. It includes non-circular cross-section profile, equal wall thickness, variable wall thickness, variable diameter and variable wall thickness along the length direction, symmetrical and asymmetric cross-section, etc. Such as square, rectangle, cone, trapezoid, spiral, etc. Special shaped steel pipe can adapt to the particularity of service conditions, save metal and improve the labor productivity of parts manufacturing. It is widely used in aviation, automobile, shipbuilding, mining machinery, agricultural machinery, construction, textile and boiler manufacturing. Cold drawing, welding, extrusion, hot rolling and so on are the production methods of cold drawn special-shaped steel pipe, among which the cold drawing method has been widely used.
    Cold drawn profiled steel pipe is widely used in various structural parts, tools and mechanical parts. Compared with circular tubes, DQ cold drawn profiled steel tubes generally have larger moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce the structural weight and save steel.
    Cold drawn special-shaped steel pipe is generally distinguished according to the cross-section. According to the material, it can be divided into seamless steel pipe, aluminum alloy cold-drawn special-shaped steel pipe and plastic cold-drawn special-shaped steel pipe. The following mainly introduces the steel pipe cold drawing special-shaped steel pipe.
    The cold drawn special-shaped steel pipe can be divided into DQ oval shaped steel pipe, DQ triangle shaped shaped shaped steel pipe, DQ hexagonal shaped special-shaped steel pipe, DQ rhombic special-shaped steel pipe, DQ octagonal shaped shaped steel pipe, DQ semi-circular shaped steel pipe, DQ unequal hexagon shaped steel pipe, DQ five petal plum shaped shaped shaped shaped steel pipe, DQ double convex shaped shaped shaped steel pipe, double concave shaped shaped shaped shaped steel pipe, melon seed shaped shaped shaped steel pipe, conical shaped shaped shaped shaped steel pipe, circular cone shaped shaped shaped shaped shaped shaped shaped steel pipe, etc Corrugated profiled steel pipe.
    According to the shape, the special-shaped steel pipe can be divided into: outer hexagon inner round steel pipe, outer circle inner hexagon steel pipe, inner and outer hexagonal steel pipe, flat elliptical steel pipe, elliptical steel pipe, triangle pipe, L-shaped steel pipe, octagon pipe, mushroom type pipe, bread type pipe, D-type pipe, concave pipe, convex pipe, umbrella type pipe, p-type pipe, Yuanbao type pipe, etc. the shape of the special-shaped steel pipe is produced according to the needs of users.
    Special shaped steel pipe, special-shaped steel pipe bending forming, this forming method, is also known as bending. There are two kinds of special-shaped steel pipe bending, one is true bending, the other is empty bending.
    True bending square tube compaction, then bending bending, internal and external roller tube, special-shaped steel pipe inner and outer wall compaction is a two-way process. The real advantage of rectangular tube bending is that the solid bending will be relatively small, and, to form a more accurate, and in the production time, as long as the use of roller type is accurate, and the internal rebound of the steel pipe forming more accurate angle of shaped steel pipe, we can ensure the accuracy.
    There are some disadvantages of instant bending. The main drawing time will cause the steel pipe to become thinner, the true bending will cause the rectangular pipe to bend. In agricultural products, the length of the bending curve along the length direction of the special-shaped steel pipe will be shortened, and the metal content will be thinned due to stretching.
    Hollow Bending Rectangular pipe production, external roller and square and special-shaped steel pipe outer wall, with metal bending, empty bending time of individual, steel pipe bending curve will produce certain compression, so the compression effect, longitudinal variable length zigzag line, rectangular tube bending metal, will become thick air bending, compression or thickening effect.
    According to the needs of different products, the appropriate process configuration is selected according to the needs of different products. It should be noted that when stretched and compressed, the impression on product quality, or resulting in square rectangular tube deformation.
    1. Performance index analysis of profiled steel pipe - plasticity
    Plasticity refers to the ability of metal materials to produce plastic deformation (permanent deformation) without damage under load.
    2. Performance index analysis of profiled steel pipe hardness
    Hardness is the indicator to measure the hardness and softness of metal materials. At present, the most commonly used method to determine the hardness in production is the indentation hardness method. It uses a certain geometric shape of the indenter to press into the surface of the tested metal material under a certain load, and then determines the hardness value according to the degree of indentation.
    The common methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).
    3. Performance index analysis of profiled steel pipe fatigue
    The strength, plasticity and hardness discussed above are the mechanical properties of metals under static load. In fact, many machine parts work under the cyclic load, under which the parts will produce fatigue.
    Performance index analysis of profiled steel tubes impact toughness
    The load acting on the machine parts with high speed is called impact load, and the ability of metal to resist damage under impact load is called impact toughness.
    5. Performance index analysis of profiled steel pipe - strength
    Strength refers to the ability of metal materials to resist failure (excessive plastic deformation or fracture) under static load. Because the action mode of load has the form of tension, compression, bending, shear, so the strength is also divided into tensile strength, compressive strength, bending strength, shear strength and so on. There is a certain relationship between various strengths, and tensile strength is usually used as the most basic strength indicator in use.
    1. For the site or warehouse where the special-shaped steel pipe products are stored, it should be selected in a clean and tidy place with smooth drainage, and away from the factories and mines with harmful gas or dust. The ground should be cleaned of weeds and all sundries to maintain the cleanliness of steel.  
    2. In the warehouse, it is not allowed to stack together with acid, alkali, salt, clay and other materials that are corrosive to steel. Different kinds of steel should be classified and stacked to avoid confusion and contact with corrosive objects
    3. Large steel pipes, rails, steel plates, large diameter steel pipes and forgings can be stacked in the open air  
    4. Small and medium-sized section steel, wire rod, steel bar, medium diameter steel pipe, steel wire and steel wire rope can be stored and placed in the material shed with satisfactory ventilation, and it is important to cover the top and pad the bottom  
    5. Small scale steel, thin steel plate, steel strip, small diameter or special-shaped steel pipe, various cold-rolled and cold-drawn steel products and metal products with high price and easy to corrode can be stored and put into storage
    6. The warehouse should be selected according to the geographical conditions, and the ordinary closed warehouse should be used if it is considered appropriate, that is, the warehouse with a roof with walls, tight doors and ventilation devices
    The warehouse should be kept in a proper storage background. Ventilation should be paid attention to in sunny days and closed to prevent moisture in rainy days
    Hexagonal steel pipe is also called special-shaped steel pipe, in which there are octagonal pipe, rhombic pipe, elliptical pipe and other shapes. It is economic section steel pipe, including non-circular cross-section profile, equal wall thickness, variable wall thickness, variable diameter and wall thickness along the length direction, symmetrical and asymmetric cross-section, etc. It is widely used in various building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks and warehouse shelves.
    Hexagonal steel pipe is also called special-shaped steel pipe, including octagonal pipe, rhombic pipe and [1]   Oval tube, etc. It is economic section steel pipe, including non-circular cross-section profile, equal wall thickness, variable wall thickness, variable diameter and wall thickness along the length direction, symmetrical and asymmetric cross-section, etc. Such as square, rectangle, cone, trapezoid, spiral, etc. Special shaped steel pipe can adapt to the particularity of service conditions, save metal and improve the labor productivity of parts manufacturing. It is widely used in aviation, automobile, shipbuilding, mining machinery, agricultural machinery, construction, textile and boiler manufacturing. Cold drawing, welding, extrusion, hot rolling and so on are the production methods of cold drawn special-shaped steel pipe, among which the cold drawing method has been widely used.
    Hollow hexagonal angle steel is widely used in various structural parts, tools and mechanical parts. Compared with circular tubes, hexagonal tubes generally have larger moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce the structural weight and save steel.
    Hexagonal angle steel is a kind of section steel, also known as hexagonal bar, the section of which is hexagonal bar. Take the opposite length s as the nominal dimension. The hexagonal angle steel can be used to form various load-bearing members according to the different needs of the structure, and can also be used as the connection between the components. It is widely used in various building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks and warehouse shelves.
    Cold drawn special-shaped steel pipe is generally divided into oval shaped steel pipe, triangle shaped steel pipe, hexagonal shaped special-shaped steel pipe, diamond shaped shaped shaped steel pipe, stainless steel patterned pipe, stainless steel U-shaped steel pipe, D-shaped pipe, stainless steel elbow, S-shaped pipe, octagonal shaped steel pipe, semicircular shaped steel circle, unequal hexagon shaped steel pipe Five petal plum shaped special-shaped steel pipe, double convex shaped special-shaped steel pipe, double concave special-shaped steel pipe, melon seed shaped special-shaped steel pipe, conical shaped special-shaped steel pipe, corrugated shaped special-shaped steel pipe, etc.
    The application material classification of hexagonal steel pipe: 20, 45, 16 manganese and other different materials for different purposes.
    Hexagonal steel tube is an outer hexagon steel pipe. It is a kind of special-shaped steel pipe. It is mainly used for the processing of nuts and mechanical accessories. Hollow hexagonal bar is the general name of the steel pipe with external hexagon and inner circular cross-section shape, including welded cold-drawn special-shaped steel pipe and seamless cold-drawn special-shaped steel pipe. Because of the material, it can be divided into ordinary carbon steel pipe, stainless steel hexagonal pipe.
    6.1 grade and chemical composition of steel 6.1.1 the grade of steel is 10, 20, 35 and 45 steel; Q195, Q215, Q235 steel; The chemical composition (melting analysis) of Q345 and Q390 steel shall meet the requirements of GB / T 699, GB / T 700 and GB / T 1591 respectively. 6.1.2 when the demander requires chemical analysis of finished products, it shall be indicated in the contract. The allowable deviation of chemical composition of finished steel pipe shall comply with GB / T 222. 6.1.3 according to the requirements of the demander, steel pipes of other grades can be produced through negotiation between the supplier and the demander.
    Lower yield strength rel / MPA elongation after fracture a /% absorbed energy Kv2 / J serial number quality grade not less than temperature / ℃ no less than 110 - 335 205 24 - 220 - 410 245 20 - 335 - 510 305 17 - 4 45 - 590 335 14 - 5 Q195 - 315 - 430 195 33 - a - 6 Q215 B 335 - 450 215 30 + 20 27 A - B + 20 C 0 7 Q235 D 370 - 500 235 25 - 20 27 A -- B 20 + 20 C 0 d - 20 34 8 Q345 E 470~630 345 21 -40 27
    Cold drawn special-shaped steel pipe is generally distinguished according to the cross-section. According to the material, it can be divided into seamless steel pipe, aluminum alloy cold-drawn special-shaped steel pipe and plastic cold-drawn special-shaped steel pipe. The following mainly introduces the steel pipe cold drawing special-shaped steel pipe.
    Cold drawn special-shaped steel pipe is the general term of seamless steel pipe with other cross-section shapes except round pipe.
    According to the shape and size of steel pipe section, it can be divided into equal wall thickness cold drawn special-shaped steel pipe (code D), unequal wall thickness cold-drawn special-shaped steel pipe (Code: BD), variable diameter cold-drawn special-shaped steel pipe (Code: BJ).
    Cold drawn profiled steel pipe is widely used in various structural parts, tools and mechanical parts. Compared with circular tubes, cold drawn profiled steel tubes generally have larger moment of inertia and section modulus, greater bending and torsion resistance, which can greatly reduce the structural weight and save steel.
    Cold drawn steel pipe can be divided into oval shaped steel pipe, triangle shaped steel pipe, hexagonal shaped steel pipe, rhombic shaped steel pipe, octagonal shaped steel pipe, semicircular shaped steel circle, unequal hexagon shaped steel pipe, five petal plum shaped special-shaped steel pipe, double convex shaped steel pipe, double concave shaped steel pipe, melon seed shaped shaped shaped steel pipe, conical shaped special-shaped steel pipe, semi-circular special-shaped steel pipe, non-uniform hexagonal shaped steel pipe, five petal plum shaped shaped special-shaped steel pipe, double convex shaped steel pipe, double concave shaped steel pipe Corrugated profiled steel pipe.
    Cold drawn special-shaped steel pipe is divided into special-shaped square pipe, rectangular cold-drawn special-shaped steel pipe, special-shaped welded pipe, spiral welded pipe, specification: 20 * 20mm-500mm, wall thickness 0.6mm-20mm, spiral steel pipe. Spiral steel pipe specification: 219mm-2020mm, wall thickness: 5mm-20mm. Straight seam specifications include 4 points, 6 points, 1 inch, 1.2 inch, 1.5 inch, 2 inch, 2.5 inch, 3-inch, 4-inch, 5-inch, 6-inch, 8-inch, 102, 108, 127, 133, 139, 159, 168, 177 The cold drawn special-shaped steel pipes of 194, 219, 273, 325 and other specifications generally refer to square rectangular steel pipes.
    1. Performance index analysis of profiled steel pipe plasticity
    Plasticity refers to the ability of metal materials to produce plastic deformation (permanent deformation) without damage under load.
    2. Performance index analysis of profiled steel pipe hardness
    Hardness is the indicator to measure the hardness and softness of metal materials. At present, the most commonly used method to determine the hardness in production is the indentation hardness method. It uses a certain geometric shape of the indenter to press into the surface of the tested metal material under a certain load, and then determines the hardness value according to the degree of indentation.
    3. Performance index analysis of profiled steel pipe fatigue
    The strength, plasticity and hardness discussed above are the mechanical properties of metals under static load. In fact, many machine parts work under the cyclic load, under which the parts will produce fatigue.
    4. Performance index analysis of profiled steel pipe - impact toughness
    The load acting on the machine parts with high speed is called impact load, and the ability of metal to resist damage under impact load is called impact toughness.
    Performance index analysis - strength
    Strength refers to the ability of metal materials to resist failure (excessive plastic deformation or fracture) under static load. Because the action mode of load has the form of tension, compression, bending, shear, so the strength is also divided into tensile strength, compressive strength, bending strength, shear strength and so on. There is a certain relationship between various strengths, and tensile strength is usually used as the most basic strength indicator in use.
    【1】 The concept of special-shaped steel pipe, rectangular pipe, square pipe: the traditional welding stainless steel square rectangular pipe is usually produced with a turkey head roller and several square rectangular rollers. The production mainly relies on the flat roll rolling. Because the flat roll is a two roll structure, there are problems such as unequal roll gap and inconsistent stress state at the corner of square rectangular tube, resulting in the four corners of square rectangular tube not sharp, r = 1.2t, rectangular pipe ruler is the radius of external fillet, f is the wall thickness. Although it is in line with the relevant enterprise standards, it can not meet the user's requirements for high-quality products. The new design adopts Turkey head four roll rolling shaping. Because the four roll structure of Turkey head is the same, the roll gap of four corners is equal, and the stress state of corner is consistent. When the rolling force is large enough, the plastic deformation of the corner occurs, which makes the metal fill the corner. The intersection line between the plane and the arc surface is formed on the outer surface of the tube, namely sharp angle,
    【2】 The deformation mechanism of rectangular tube is different from that of ordinary square rectangular tube by bending. It depends on the rolling force of roller, and produces extrusion force F through arc arch. As shown in Fig. 2, plastic deformation occurs at the corner of steel strip, so as to make special-shaped steel pipe and rectangular pipe, The square tube is formed by filling the corner.
     
    The above-mentioned cold-drawn special-shaped steel pipes are collected and released by Jinxuan special-shaped steel pipe factory. Welcome to call us for consultation and purchase. Thank you for your cooperation.
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