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Q235 welded square pipe is an appellation of square pipe, that is, steel pipe with the same side length. It is made of rolled strip steel through technological solution. Normally, the strip steel is unpacked, flat, curled and welded to form a round pipe, and then the round pipe is rolled to check the Q235 welded square pipe, and then cut to the required length. The normal is 50 pieces per package. Strength refers to the function of Q235 welded square tube to resist destruction (appropriate plastic deformation or fracture) under static load. Because the action forms of load include tension, contraction, meandering, shear and so on, because the strength is also divided into tensile strength, compressive strength, flexural strength, shear strength and so on. There is often a definite connection between various strengths. In normal use, tensile strength is the most fundamental strength gauge. Strength resists the power of destruction, which is called storming toughness.

The load on the parts with great progress is called the charge and trap load. The strength, plasticity and angle discussed later are the machine function indicators of Q215 welded square pipe under static load. In practice, many mechanical machines are under repeated load, and the whole opportunity is tired in this environment. Fatigue angle is a gauge needle to weigh the soft and hard level of metal data. In recent years, the most rarely used internal angle determination method is the press in angle method. It uses the indenter with a certain number and shape to press into the data surface of Q235 welded square tube under a certain load, and internally determines its angle value according to the press in level. The commonly used methods include Brinell angle (HB), Rockwell angle (HRA, HRB, HRC) and Vickers angle (HV). Angular plasticity refers to the power of plastic deformation (permanent deformation) without destruction of metal materials under load. Plastic Q215 welded square tube non-standard seamless square tube is extruded from seamless circular tube. The distinction between seamless and welded square tube is literal. It is a kind of square tube (rectangular tube). The spirit of many materials can form the body of square tube (rectangular tube). Its medium is, why and where it is used. Most Q215 welded square tubes are steel tubes, mostly structural square tubes, whitewashed square tubes, building square tubes (rectangular tubes), etc

The narrow blank of welded square pipe can produce the welded pipe with larger pipe diameter, and the blank with the same width can also produce the welded pipe with different pipe diameter. However, compared with the straight seam square pipe with the same length, the weld length increases by 30 ~ 100%, and the production speed is low.

Welded square pipes with large or thick diameter are generally made of steel blank directly, while small welded pipes and thin-walled welded pipes only need to be welded directly through steel strip. Then after simple polishing, wire drawing is OK. Therefore, straight seam welding is mostly used for small-diameter welded pipes, and spiral welding is mostly used for large-diameter welded pipes.

Common materials of welded square pipes are: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00cr19ni11, 1Cr18Ni9, 0cr18ni11nb, etc.

Welded stainless steel pipe for decoration (GB / T 18705-2002), stainless steel welded pipe for building decoration (JG / T 3030-1995), large diameter welded steel pipe for low pressure fluid transmission (GB / T 3091-2001), and welded steel pipe for heat exchanger (yb4103-2000).