Price list of Kunming square tube

Development history edit price list of Kunming square tube
Early stage (1904-1934)
In this period, the continuous pipe rolling technology was not yet mature. Price list of Kunming square tube
The second stage (1934-1950)
The technology of floating mandrel connecting square tube is gradually mature.
The third stage (1961-1978)
The floating core holding continuous tube mill is in its heyday
The fourth stage (1978-1992)
There are 11 sets of MPM and 2 sets of MRK continuous rolling mills in the world.
Mechanical property editor Kunming square tube price list
The strength refers to the function of Q195 welding square tube data to resist damage (moderate plastic deformation or fracture) under static load. Because the action forms of load include stretching, tightening, winding, shearing, etc., the strength is also divided into tensile strength, compressive strength, bending strength, shear strength, etc. There is always a definite connection between various strengths, and the tensile strength is usually used as the basic strength indicator in use.
【1】 The function index analysis of Q195 welded square tube - the load on the machine parts caused by the strength with great progress is called the frontal load, and the strength of Q195 welded square tube to resist damage under the frontal load is called the frontal toughness.
【2】 Function index analysis of Q195 welded square tube - the strength, plasticity and angle discussed in the following section are all machine function indicators of metal under static load. In practice, many complete machines are repeatedly loaded with employment services, and in this environment, the whole machine is tired.
【3】 Functional index analysis of Q195 welding square tube - The rarely used methods of fatigue include the methods of Q195 welding square tube Brinell angle (HB), Rockwell angle (HRA, HRB, HRC) and Vickers angle (HV). Angle is a pointer for weighing the hardness and softness of metal materials. The pressing angle method is rarely used in the internal angle determination in the immediate life. It uses a certain number of indenters with certain shapes to press into the tested metal data surface under a certain load, and determines the angle value according to the pressing level.
【4】 Function index analysis of Q195 welded square tube - angular plasticity refers to the power of plastic deformation (permanent deformation) without damage under the load of Q195 welded square tube data.
【5】 Function index analysis of Q195 welded square tube - mechanical function of plastic square tube.
Forming method Edit price list of Kunming square tube
1. Solid bend
Solid bending, as the name implies, is to compact the bending. During solid bending, the inner and outer rollers and the inner and outer walls of the tube blank are compacted in both directions.
1) The advantages of solid bending are small rebound, accurate forming, and as long as the roll shape is accurate, the R of internal angle forming is relatively accurate.
2) The disadvantage of solid bending is the stretching/thinning effect. At the front, the actual bending will make the bending place stretch, and the stretching effect will shorten the longitudinal length of the bending line; Second, the metal at the real bend will become thinner due to stretching.
2. Price List of Empty Bend Kunming Square Tube
Empty bending is the bending moment formed by the one-way contact between the outer roll and the outer wall of the tube blank to bend the strip. Empty bending will compress the bending line, the compression effect will make the bending line longitudinally extend, and the metal at the bend will accumulate and thicken, which is the compression/thickening effect of empty bending.
1) The advantage of empty bending is that the side length can be bent when the actual bending cannot be carried out, such as the synchronous bending and finishing of the upper/side edges of square and rectangular tubes. The hollow bending can also bend the inner corner with R<0.2t without breaking the pipe wall.
2) The disadvantage of empty bending is that when the upper side/side side are synchronously bent, because the upper roll and the lower roll produce pressure at the same time, the forming force is easy to exceed the critical point, causing instability and concave at the edge, and also affecting the stable operation of the unit and the forming quality. This is also the difference between square and round tubes in empty bending.
Edit price list of Kunming square tube for special purpose
1. Square tube product description
Square tube is a kind of light thin-walled hollow square section Steel pipe , also known as steel cold-formed profiles. It is a type of section steel with square cross section shape and size made of Q235 hot-rolled or cold-rolled strip or coil as the base material after cold bending and forming and then high-frequency welding. In addition to wall thickening, the corner size and edge straightness of hot-rolled extra thick wall square tubes reach or even exceed the level of resistance welded cold formed square tubes. Good comprehensive mechanical properties, weldability, cold and hot workability and corrosion resistance, and good low-temperature toughness.
2. Purpose of square tube
The square tube is used for building, machinery manufacturing, steel construction and other projects, shipbuilding, solar power generation Bracket , steel structure engineering, electricity
Price list of Kunming square tube
Square tube products (3 pieces)
Power engineering, power plant, agricultural and chemical machinery, Glass curtain , car chassis , airport, boiler construction, highway railings, housing construction, pressure vessels, oil tanks, bridges, power station equipment, lifting and transportation machinery and other high load welding structures.
Category Editing
Process classification
Price list of Kunming square tube
Square tubes are divided into hot rolled seamless square tubes, cold drawn seamless square tubes, extruded seamless square tubes and welded square tubes according to the production process.
The welded square pipe is divided into:
(a) According to the process - arc welding square tube, resistance welding square tube (high-frequency, low-frequency), gas welding square tube, furnace welding square tube
(b) According to welds - straight seam welded square tube, spiral welded square tube
Material classification
Price list of Kunming square tube
Square pipes are divided into plain carbon steel square pipes and low-alloy square pipes according to their materials. Ordinary carbon steel is divided into Q195, Q215, Q235, SS400, 20 # steel, 45 # steel, etc; Low alloy steel is divided into Q345, 16Mn, Q390, ST52-3, etc.
Production standard classification

According to production standards, square tubes are divided into: national standard square tubes, Japanese standard square tubes, British standard square tubes, American standard square tubes, European standard square tubes, and non-standard square tubes.
Section shape classification

Square pipes are classified according to section shape:
(1) Simple section square tube - square tube, rectangular tube
(2) Complex cross section square tube - flower shaped square tube, open shaped square tube, corrugated square tube, special-shaped square tube
Surface treatment classification
Price list of Kunming square tube
Square tubes are divided into hot-dip galvanized square tubes, electrogalvanized square tubes, oiled square tubes and pickled square tubes according to surface treatment
Use classification
Price list of Kunming square tube
The square tubes are classified according to their uses - square tubes for decoration, machine tool equipment, machinery industry, chemical industry, steel structure, shipbuilding, automobile, steel beam and column, and special purposes
Wall thickness classification

Square tubes are classified according to wall thickness - super thick wall square tubes, thick wall square tubes and thin wall square tubes
Performance Editing
Price List of Plastic Kunming Square Tube

Plasticity refers to the ability of metal materials to produce plastic deformation (longer deformation) without damage under load.
hardness

Hardness is a pointer to measure the hardness of metal materials. At present, the commonly used hardness measurement method in production is the indentation hardness method, which uses an indenter with a certain geometric shape to press into the surface of the metal material to be tested under a certain load, and determines its hardness value according to the degree of indentation.
Common methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).
fatigue
Price list of Kunming square tube
The strength, plasticity and hardness discussed above are all indicators of the mechanical properties of metals under static load. In fact, many machine parts work under cyclic load, in which case fatigue will occur.
impact toughness

The load acting on the parts at a high speed is called the impact load, and the ability of metal to resist damage under the impact load is called the impact toughness.
strength
Price list of Kunming square tube
Strength refers to the ability of metal materials to resist damage (excessive plastic deformation or fracture) under static load. Since the action mode of load includes tension, compression, bending, shear and other forms, the strength is also divided into tensile strength, compressive strength, bending strength, shear strength and so on. There is often a certain relationship between various strengths, and tensile strength is generally used as a basic strength indicator.

Specification table of square tube edit