Seamless square rectangular pipe is a kind of long steel with a hollow section and no joints around the perimeter. The tube is hollow, with a set cross-sectional area, a large number of pipelines used for conveying fluids, such as pipelines transporting oil, natural gas, gas, water and some solid materials, etc., the ring section is under internal or external radial pressure, the force is more uniform, therefore, the vast majority of steel pipes are round pipes. However, the round pipe also has certain limitations, such as under the condition of plane bending, the round pipe is not as strong as the square and rectangular pipe bending strength, and some agricultural machinery skeletons, steel and wood furniture are commonly used square and rectangular pipes.

Product information:

Enforce standards:

GB/T3094-2000 (national standard) cold-pressed shaped rectangular tube

GB/T6728-2002 (National standard) cold formed hollow section steel for structure

ASTM A500 (American Standard) Welded rectangular tubes and seamless rectangular tubes with carbon steel cold formed round and shaped sections for construction

EN10219-1-2006(European standard) non-alloy and fine grain cold formed welded hollow structure profiles

JIS G 3466 (day standard) angular rectangular tube for general construction

Q345 seamless pipe is a low alloy series ---- low alloy high strength structural steel (GB/T1591-1994). Q345A, B, C, D, E is the representative grade of this kind of steel, of which A, B steel is usually called 16Mn, this material is the most common; Q represents the yield of this material, and the 345 behind refers to the yield value of this material, which is about 345.

Chemical composition(%):

Q345A seamless pipe mechanical properties:

Tensile strength: 490-675MPa, yield strength: ≥345MPa, elongation: ≥ 21%

Q345B seamless pipe mechanical properties:

Tensile strength: 490-675MPa, yield strength: ≥345MPa, elongation: ≥21%

Q345C seamless pipe mechanical properties:

Tensile strength: 490-675MPa, yield strength: ≥345MPa, elongation: ≥22%

Q345D seamless pipe mechanical properties:

Tensile strength: 490-675MPa, yield strength: ≥345MPa, elongation: ≥22%

Q345E seamless pipe mechanical properties:

Tensile strength: 490-675MPa, yield strength: ≥345MPa, elongation: ≥22%

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Q355 is a type of steel. It is a kind of low-alloy high-strength structural steel, widely used in Bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc., where "Q" means yield strength, 355 means that the yield strength of this steel is 355MPa, and will reduce its yield value as the thickness of the material increases.

Chemical composition(%):

Yield strength(Mpa):

Tensile strength (Mpa) : 450-630.

Impact test (temperature: 0℃) : longitudinal ≥34J, transverse ≥27J

Elongation (%) : ≥21