Mechanical properties of galvanized steel tubes

Release Time :

2022-10-27 13:26

① Tensile strength (σb) : the specimen in the tensile process, in the tensile fracture under the maximum force (Fb), divided by the sample original cross-sectional area (So) stress (σb), known as tensile strength (σb), unit is N/mm2 (MPa). It represents the maximum capacity of a metal material to resist damage under tensile force. Where, Fb-- the maximum force borne by the specimen when it breaks, N (Newton); So-- original cross-sectional area of sample, mm2.
② Yield point (σs) : The stress at which the specimen can continue to extend without increasing the force during the tensile process of the metal material with yield phenomenon, which is called yield point. If the force drops, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa). Upper yield point (σsu) : the maximum stress of the specimen before the first drop in force due to yield; Lower yield point (σsl) : the minimum stress in the yield stage, excluding the initial instantaneous effect. Where: Fs-- yield force (constant) in the tensile process of the sample, N (Newton) So-- original cross-sectional area of the sample, mm2.
③ Elongation after breaking: (σ) In the tensile test, the percentage of the length increased by the standard distance of the specimen after breaking and the length of the original standard distance is called elongation. It is expressed as σ, in %. Where: L1-- the distance length of the sample after it is broken, mm; L0-- original range length of sample, mm.
(4) Sectional shrinkage ratio: (ψ) The percentage of the maximum reduction of the cross-sectional area and the original cross-sectional area at the reduced diameter after the specimen is drawn is called the sectional shrinkage ratio. ψ is expressed in %. Where: S0-- original cross-sectional area of sample, mm2; S1-- the minimum cross-sectional area at the reduced diameter of the specimen after tensile break, mm2.
⑤ Hardness index: the ability of metal materials to resist hard objects to compress the surface, known as hardness. According to the different test method and application range, the hardness can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness. There are three kinds of Brinell, Rockwell and Vickers hardness commonly used for pipes.
Brinell hardness (HB) : A steel ball or hard alloy ball with a certain diameter is pressed into the surface of the pattern with a specified test force (F). After the specified holding time, the test force is removed and the indentation diameter (L) of the specimen surface is measured. The Brinell hardness value is the quotient of the test force divided by the surface area of the indentation ball. It is expressed in HBS (steel ball) and expressed in N/mm2(MPa).

Application field of square tube

Application: Widely used in machinery manufacturing, construction industry, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobile industry, railway, highway guardrail, container skeleton, furniture, decoration and steel structure fields.

2022-10-27

Effect of adding elements to galvanized steel pipe on its properties

Inrecent years, ITU argon pipeline welding method has been widely usedin petrochemical industry, power construction and energy system.Different from the common arc extinguishing and priming process ofmanual arc welding, manual arc welding fills the cover surface.

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Stainless steel pipe what hardness index

In the stainless steel pipe standard, Brinell hardness is the most widely used, often to indentation diameter to indicate the hardness of the material, both intuitive and convenient. But for harder or thinner steel pipe is not suitable.

2022-10-27

What are the classifications of seamless steel pipes

The materials are ordinary and high quality carbon structural steel (Q215-A ~ Q275-A and No. 10 ~ 50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless acid resistant steel, etc. According to the purpose, it is divided into general purpose (for water and gas pipelines and structural parts, mechanical parts) and special purpose (for boiler, geological exploration, bearing, acid resistance, etc.).

2022-10-27

Performance of square pipe

Square pipe, square pipe and rectangular pipe is a kind of address, that is, the side length is equal and unequal steel pipe. It is made of strip steel through processing and rolling. Generally, strip steel is unpacked, leveled, crimped, welded to form a round tube, which is then rolled into a square tube and cut to the required length.

2022-10-27

Corrosion resistance of welded steel tubes

In the production of T-welded steel pipe, the wrong edge often occurs, and there are many influencing factors. In production practice, steel pipe is often degraded by the wrong edge. Therefore, it is necessary to analyze the causes of spiral steel pipe misalignment and its preventive measures.

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