West-BaySquare galvanized square pipeThe differentiation of industry benefits

Elongation after square tube breaking (& sigma;): in the tensile test, the percentage of the length increased by the gauge length of the sample after breaking and the length of the original gauge length is called elongation. In & sigma; Expressed in%.

Both internal and external welding of square pipes are carried out by American Lincoln Electric welding machine for single wire or double wire submerged arc welding so as to obtain stable welding specifications.

West-Bay.The reason why the surface of fake and shoddy materials is easy to crack is that its blank is adobe with many air holes. During the cooling process, the adobe has cracks due to the action of thermal stress, and there are cracks after rolling.

Classification of surface treatment square pipe is divided into hot-dip galvanized square pipe electro galvanized square pipe, oiled square pipe and pickled square pipe according to surface treatment.

.First, remove the deposits on the surface of the square pipe surface with copper wire brush. Use the perfume oil or other scrubbing oil on the surface layer, or use phosphate or chromate solution brush, spray or dip coating. After the fixed reaction time, rinse the acid solution with plenty of fresh water on the surface.

Requirements for samples samples can be taken from metal pipes with qualified appearance. Generally, sawing is adopted.

Square tube is a kind of square tube, which is rolled by strip steel after process treatment. Many kinds of materials can form a square tube body. It is used for what purpose and where. Most square tubes are steel tubes, mostly structural square tubes, decorative square tubes and building square tubes. Generally, the strip steel is unpacked, leveled, crimped and welded to form a circular tube, which is rolled into a square tube and then cut to the required length. Usually 50 pieces per bag.

High hardness square tubes mainly bear fatigue load, so they must have high hardness. Therefore, quenching, surface quenching or chemical heat treatment shall be carried out, followed by low-temperature tempering treatment.

Put the pig iron for steelmaking into the steelmaking furnace according to the specified process to obtain steel. The products of steel include ingots, continuous casting billets and various steel castings made of straight square tubes. Generally speaking,West-BayStainless steel 25 square tube, steel refers to the steel rolled into various square tubes. Square tube steel belongs to ferrous metal, but steel is not completely equal to ferrous metal.

Square pipe, also known as square and rectangular cold-formed hollow section steel, it shall not exceed plus or minus 10% of the nominal wall thickness. Long term square pipe, seamless square pipe, galvanized square pipe, galvanized pipe, 20-year-old brand, price advantage and quality guarantee! When the wall thickness is greater than 10mm, it is plus or minus 8% of the wall thickness, except for the wall thickness of corners and weld areas.

Analysis project.Square pipe, also known as square and rectangular cold-formed hollow section steel, is referred to as square pipe and rectangular pipe for short. The allowable deviation of wall thickness of square pipe is f and J q355b respectively. When the wall thickness is no more than 10mm, it shall not exceed plus or minus 10% of the nominal wall thickness. Long term square pipe, rectangular pipe, seamless square pipe, galvanized square pipe, galvanized pipe, 20-year-old brand, price advantage and quality guarantee! When the wall thickness is greater than 10mm, it is plus or minus 8% of the wall thickness, except for the wall thickness of corners and weld areas.

In fact, the casting cleaning is not just shot blasting. For large parts, the drum sand cleaning is carried out first, that is, the riser of the casting is cut off and rolled in the drum, and the square tubes collide with each other in the drum to remove most of the sand on the surface before shot blasting or shot blasting.

In & sigma; Expressed in%. The calculation formula is: where: L1 -- gauge length after sample breaking, mm; L0 -- original gauge length of sample, mm. Reduction of area (& psi;) in the tensile test, mm2; S1 -- small cross-sectional area at the reduced diameter after sample breaking, mm2.

In the test, place the sample between two parallel plates and press it evenly to the flattening distance h specified in relevant technical conditions with a press or testing machine at a speed of no more than 60mmin.

superior quality.After aluminum deoxidation in molten steel,West-BayCold galvanized square pipe factory, & omega; When (ALS) is 0.015% ~ 0.025%, calcium treatment can achieve better effect on the denaturation of Al203.

For transportation: water supply, drainage, sewage treatment engineering, mud transportation, marine water transportation.

The q355b square tube rolled from the strip steel through process treatment is generally to unpack, flatten, curl and weld the strip steel to form a round tube,West-BayWhere does galvanized square tube sell, then roll the round tube into a square tube, and then cut it to the required length. Nowadays the forming of q355b square tube has solid bending and empty bending. The bending degree of q355b square tube shall not be greater than 3mm per meter, and the total bending degree shall not be greater than the actual bending of the total length. As the name suggests, the bending is compacted, and the internal and external rollers and the internal and external walls of the tube blank are compacted in both directions during the actual bending.

West-Bay.All seamless q355b square tubes shall be tested for mechanical properties. Mechanical property tests are mainly divided into two categories: tensile test and hardness test.

Section shape classification square tube is classified according to section shape: simple section square tube: square tube, rectangular square tube.

It is forbidden to degrease the oil square pipes and pipe fittings in the direct production concentration unit, air separation unit, oil refining and chemical engineering according to the design requirements. The purpose of degreasing is to prevent the transported or stored materials from being contaminated by grease or organic matter; Avoid mixing transported or stored materials with grease or organic matter; Oil content to ensure the activity of the catalyst; The content of oil and organic matter to ensure the purity of the product. The installed square pipe shall be disassembled into pipe sections for degreasing. Pipes that cannot be disassembled after installation shall be degreased before installation. Square pipes with obvious oil stains or serious corrosion shall be cleaned by steam purging