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Shaped square tube is a hollow square section steel pipe, also known as steel cooling bent profile. The special-shaped square tube is a square cross-section shaped steel made of hot-rolled or cold-rolled strip steel or coil blanks after cold bending and then high frequency welding. Hot-rolled extra-thick-walled square tubes are thickened and thickened except for corner thickness and edge flatness, which have reached or even exceeded the level of resistance-weld cold-formed square tubes. If you have such needs, you may wish to follow me to understand the relevant knowledge of the special shaped square tube!
Shaped square tube
Special-shaped square tube is a name for square pipe, that is, equal length or unequal steel pipe. According to the national standard GBT 6728-2002 structure with cold-formed hollow steel size, shape, weight and allowable deviation of production, is the strip processed by the process coil. Shaped square tube is divided into its material: Q235B, 16Mn, Q345B. Generally, the strip is unpacked, flattened, curled and welded to form a square. The length of the strip is usually 6 meters. The large quantity of 12 meters can be processed according to the customer's requirements. The general small size is 50 pieces per package, non-standard square tube in the spot market is relatively small. It is a square equilateral steel pipe, and its appearance, weight and allowable deviation are processed and produced. It is the Q345B strip steel rolled. The low-alloy special-shaped square tube is made of low-alloy material (Q345B) and processed by ordinary square tube is very different from the raw material material (Q195, Q215, Q235). It is the low-alloy strip steel (16Mn) after removal. Package, flat, coiled, welded to form a round tube, then rolled into a square tube by a round tube and then cut to a desired length of commonly used length of 6 meters, 12 meters or other length.
Shaped square tube features and uses
1, special square tube product description
Special-shaped square tube is a kind of hollow square section light-weight thin-walled steel tube, also called steel refrigerated bending section. Shaped square tube is made of Q235 hot-rolled or cold-rolled strip or coil plate as the parent material after cold bending forming and then high-frequency welding made of square section shape size of the steel. Hot-rolled extra-thick-walled square tubes are thickened and thickened except for corner thickness and edge flatness, which have reached or even exceeded the level of cold-formed non-standard square tube for resistance welding.
2, special square tube use
Shaped square tubes are used in construction, machinery manufacturing, steel construction projects, shipbuilding, solar power stand, steel structure engineering, power engineering, power plants, agriculture and chemical machinery, glass curtain walls, car chassis, airports and so on.
Shaped square tube seamless and weld
Shaped square tube is formed by extruding the strip.
Plasticity
Plasticity refers to the ability of a metal material to undergo plastic deformation (permanent deformation) without breaking under load.
Hardness
Hardness is a measure of the degree of hardness and hardness of metallic materials. At present, the most commonly used method for measuring hardness in production is the press-in hardness method. It uses a certain geometric shape of the indenter to press the surface of the tested metal material under a certain load, and the hardness value is determined according to the degree of press-in.
The commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).
Fatigue
The strength, plasticity, and hardness discussed above are all indicators of the mechanical properties of the metal under static loading. In fact, many machine parts work under cyclic loading, under which conditions the parts will fatigue.
4. Impact toughness
The load acting on the machine part at a great speed is called impact load. The ability of the metal to resist damage under the impact load is called impact toughness.
Shaped square tube specifications and implementation standards
Product Specifications
Shaped square tube 110*110*5.0-10.0
Special shaped square tube 60*90*4.0-8.0
Shaped square tube 125*125*6.0-12.0
Shaped square tube 80*220*5.0-10.0
Shaped square tube 135*135*6.0-12.0
Shaped square tube 80*230*5.0-10.0
Shaped square tube 145*145*6.0-10.0
Shaped square tube 80*240*6.0-10.0
Shaped square tube 172*172*8.0-12.0
Shaped square tube 90*150*8.0-12.0
Shaped square tube 175*175*5.0-10.0
Shaped square tube 100*180*5.0-10.0
Shaped square tube 220*220*8.0-16.0
Shaped square tube 120*200*5.0-12.0
Shaped square tube 230*230*5.0-10.0
Shaped square tube 150*350*6.0-14.0
Shaped square tube 240*240*6.0-12.0
Shaped square tube 260*300*8.0-12.0
Shaped square tube 260*260*8.0-12.0
Shaped square tube 160*220*6.0-12.0
Shaped square tube 280*280*8.0-12.0
Shaped square tube 160*230*8.0-12.0
Shaped square tube 360*360*8.0-12.0
Shaped square tube 450*250*8.0-16.0
1. Can perform GB6728-2002 structure with cold-formed hollow steel standard.
2. Executable JISG3466-88 Japanese general structure square tube adaptation range standards.
Shaped square tube calculation formula
Square tube weight calculation formula: 4* wall thickness*(side length - wall thickness)*7.85
Rectangular tube weight calculation formula: {(perimeter length 3.14)-wall thickness} * wall thickness * 0.02466
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Sanding Belt
Abrasive belt is a belt-shaped tool that can be ground and polished, which is made by bonding abrasives to flexible materials such as paper and cloth with a binder. It is a main form of coated abrasives. Its basic composition is: base material, abrasive and binder, collectively called the three elements of abrasive belt. Abrasive belt is the main tool of the sanding process. Abrasive belt grinding is a soft grinding method, which is a compound processing abrasive tool with multiple functions of grinding, grinding and polishing.
Abrasive tools are tools for grinding, grinding and polishing. Most of the abrasives are artificial abrasives made of abrasives and bonding agents, and natural abrasives are also directly processed from natural ore. In addition to being widely used in machinery manufacturing and other metal processing industries, abrasive tools are also used in the processing of non-metallic materials such as food processing, paper industry and ceramics, glass, stone, plastic, rubber, and wood.
Abrasives are divided into natural abrasives and artificial abrasives. All materials that can be used for grinding or grinding in nature are collectively referred to as natural abrasives.
Natural abrasives mainly include: natural corundum and garnet
Artificial abrasives mainly include: white corundum, brown corundum, silicon carbide, zirconium corundum, synthetic diamond, cubic boron nitride.
How to choose a suitable abrasive belt and further improve the smoothness and flatness of sanding is a very important issue in the use of abrasive belts. Due to the differences in the three major components of abrasive belts and various characteristic factors, abrasive belts can be divided into many varieties according to different grinding objects, grinding conditions and grinding requirements. The following is the classification of abrasive belts according to abrasives. Different abrasive belts are suitable for different products. The following types of belt operations are: automatic grinding, mechanical hand grinding, desktop grinding, and manual tool grinding.
Types of abrasive belts (according to abrasives):
1: Accumulated abrasive belt
Application: Widely used in polishing various non-alloy, low-alloy and high-alloy steel, stainless steel, brass, bronze and other non-ferrous metals. Good self-sharpening, long service life, uniform grinding volume and uniform surface roughness.
2. Brown corundum belt
Application: Widely used in metallurgy, machinery, shipbuilding, wood, building materials, textile printing and dyeing industries. Grinding and polishing of bamboo and wood products, decorative panels, stainless steel, non-ferrous metals and other complex surfaces. Fast cutting, heat resistance, long service life, efficient wear resistance.
3. Ceramic abrasive belt
Application: Widely used in grinding chromium steel, chromium-nickel steel, stainless steel, high-alloy steel, nickel-based alloy, titanium alloy, brass and bronze, etc., with good self-sharpening, strong grinding, and large removal of grinding materials.
4. Silicon carbide belt
Application: Widely used in the grinding and polishing of brass, bronze, titanium alloy, aluminum alloy, glass, ceramics, minerals, stone, rubber, and synthetic materials. The sand surface is sharp, with very high strength and grinding ability, suitable for grinding medium and high density plates. The bucky has strong tension and ultra-wide sub-tension, which can be used for ultra-large abrasive belts.
5. Zirconium corundum abrasive belt
Application: Widely used in the grinding and polishing of steel, alloy steel, cast iron and non-ferrous metals, medium load or heavy load powerful grinding. The rigid polyester fabric is resistant to strong tension and impact, has high abrasion resistance, and has excellent comprehensive cost performance.
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