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Introduction to square and rectangular tubes
Square and rectangular tubes are a name for square tubes and rectangular tubes, that is, steel tubes with equal or unequal side lengths. It is made of strip steel rolled through process treatment. Generally, the strip steel is unpacked, flattened, curled, and welded into a round tube, which is then rolled into a square tube and then cut to the required length. The Chinese name square tube is also known as square tube and rectangular tube in foreign languages. The shape is divided into square square tube and rectangular square tube. The material is divided into plain carbon steel square tube and low alloy square tube.
Also known as square and rectangular cold-formed hollow sections, referred to as square tubes and rectangular tubes, the codes are respectively plus or minus % of, when the wall thickness is greater than, it is plus or minus % of the wall thickness, except for the wall thickness in the corner and weld area.
The usual delivery length of square and rectangular pipes is, mostly and. Square and rectangular pipes are allowed to be delivered with short lengths and non-fixed length products of not less than 1,000 square meters, and can also be delivered in the form of interface pipes, but the purchaser should cut off the interface pipes when using them. The weight of short-length and non-fixed-length products shall not exceed % of the total delivery quantity. For square and rectangular pipes with a theoretical weight greater than , the total curvature shall not be greater than .% of the total length
Classification introduction
According to the production process, square and rectangular tubes are divided into hot-rolled seamless square tubes, cold-drawn seamless square tubes, extruded seamless square tubes, Among welded square pipes, welded square pipes are divided into arc welded square pipes, resistance welded square pipes (high frequency, low frequency), gas welded square pipes, furnace welded square pipes according to the process. The welds are divided into straight seam welded square pipes and spiral welded square pipes< br/> .Square tubes are divided into carbon steel square tubes and low alloy square tubes according to their materials. Ordinary carbon steel is divided into, steel, steel, low alloy steel such as steel is divided into, etc.
According to production standards, square tubes are divided into national standard square tubes, Japanese standard square tubes, British square tubes, American standard square tubes, European standard square tubes and non-standard square tubes.
.Square tubes are divided into cross-section shapesbr/>Simple cross-section square tubes, rectangular square tubesbr/>Complex cross-section square tubes, flower-shaped square tubes, open-shaped square tubes, corrugated square tubes, and special-shaped square tubes.
.Square tubes are divided into hot-dip galvanized square tubes, electro-galvanized square tubes, oiled square tubes and pickled square tubes according to surface treatment.
.Square tubes are classified according to their uses: square tubes for decoration, square tubes for machine tools and equipment, square tubes for machinery industry, square tubes for chemical industry, square tubes for steel structures, square tubes for shipbuilding, square tubes for automobiles, steel beams Square tubes and special-purpose square tubes are used for columns.
.Square and rectangular tubes are classified according to wall thickness. Extra-thick-walled square rectangular tubes, thick-walled square rectangular tubes and thin-walled square rectangular tubes can implement standards or technical agreements. Application fields are widely used in machinery manufacturing, construction industry, metallurgical industry, and agriculture. Vehicles, agricultural greenhouses, automobile industry, railways, highway guardrails, container frames, furniture, decoration and steel structure fields, etc.
Steel pipe indicators
Product implementation standards/ (National standard) Cold-pressed special-shaped rectangular pipe
/ (National standard) Cold-formed hollow section steel for structure
(American standard) Carbon steel cold-formed steel for structure Formed circular cross-section and special-shaped cross-section welded rectangular tubes and seamless rectangular tubes
(European standard) Non-alloy and fine-grained cold-formed welded hollow structural profiles
(Japanese standard) Angular rectangular tubes for general construction
Seamless square and rectangular tube product materials are alloy steel and stainless steel.
Square and rectangular tube products are used in mechanical equipment, solar equipment, steel structures, automobile parts, bridge piles, guardrails, and ship internal structures.
Editing of standards and uses
First, galvanized welded square pipes for low-pressure fluid transportation, the standard number is /. Represents material, etc. It is mainly used to transport water, gas, air, oil and heating hot water or steam, and its use is limited to general lower pressure fluids.
2. Galvanized welded square pipe for low-pressure fluid transportation, standard number is /. The representative material is the same as above. It is mainly used to transport water, gas, air, oil, heating hot water or steam and other general lower pressure fluids. The surface of the square tube adopts hot-dip galvanizing or cold-dip galvanizing anti-corrosion process.
3. Welded square pipe for mining fluid transportation, standard number I/. Represents material and grade steel. It is mainly used for straight seam welded square pipes for mine air pressure, drainage, and shaft gas discharge.
4. Large-diameter electric welded square pipes for low-pressure fluid transportation, the standard number is /. Represents material level. It is mainly used to transport low-pressure fluids such as water, sewage, gas, air, and heating steam.
5. The mechanical structure uses stainless steel welded square tubes, the standard number is /. Represents materials, etc. Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts.
6. Stainless steel welded square pipes for fluid transportation, the standard number is /. The representative materials are,,,,,, etc. Mainly used to transport low-pressure corrosive media.
7. Spiral square pipe for low-pressure transportation (Ministry of Petroleum Standards)? The standard number is /. The representative material is equal carbon steel. Mainly used for low-pressure transportation of water, oil, natural gas, heating and other pipelines.
8. Square pipes are used to transport flammable and non-flammable fluids. The standard number is (). The representative material is, steel for other pipelines. Square pipes are mainly used to transport flammable and non-flammable fluids at low or high pressure and have relatively high requirements. Mainly used in engineering construction, glass curtain wall, door and window decoration, steel structure, guardrail, machinery manufacturing, automobile manufacturing, home appliance manufacturing, shipbuilding, container manufacturing, electric power, agricultural construction, agricultural greenhouses, bicycle racks, motorcycle racks, shelves, fitness equipment , leisure and travel products, steel furniture, various specifications of oil casing, oil pipes and pipeline pipes, water, gas, sewage, air, heating and other fluid transportation, fire protection and brackets, construction industry and other fields.