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What is the difference between Seamless Steel Pipe and Welded Pipe?

Jan. 10, 2020

Seamless Steel Pipe can be made from any of several alloys and metals, such as carbon steel, stainless steel, molybdenum or tungsten.

1. The difference between the seamless steel pipe and welded pipe: seamless steel pipe is extruded and stretched from the blank, while the welded pipe is made of steel strip rolled and welded to produce pipe.

Because seamless steel pipes provide a higher range of safety measures, they are more expensive than welded pipes.

The length of seamless steel pipes is relatively short, while welded pipes can be manufactured in long continuous lengths.

Unless subject to a highly corrosive environment, seamless steel pipes generally do not show any signs of corrosion and welded areas in welded pipes are more susceptible to corrosion.

The welded area is considered to be non-uniform, so it exhibits different ductility and less corrosion resistance as well as larger dimensional changes.

Seamless steel tubes eliminate any such problems and are therefore highly resistant to corrosion.

2. Features: Seamless steel pipe has a wide range of engineering and construction applications. It is a hollow steel belt with no joints. It is mainly used for conveying liquid pipelines. It has different appearances and ordinary steels, one of which is heavy steel. Strong resistance to corrosion and general corrosion.

High precision can be used for small batch production.

Smaller in diameter.

Strong weldability and strong compression ability.

The steel pipe has superior performance and the metal is relatively dense.

Steel intersections are more complex.

High precision cold drawn products with good surface quality.

Black Seamless Steel Pipe

Black Seamless Steel Pipe

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3. Mechanical properties: The mechanical properties of seamless steel pipes are important indicators to ensure end-user performance (mechanical properties) of seamless pipes, which depends on the chemical composition and heat treatment of the steel.

In the steel standard, it provides tensile properties (tensile strength, yield strength or yield point elongation) and hardness according to different requirements.

a. tensile strength (σb)

During the stretching process, when the bear is most intense (Fb), the stress (σ) divided by the original cross-sectional area (So) is called the tensile strength (σb), and the unit is N / mm2 (MPa). It says the maximum capacity can resist the destruction of metal materials under tension.

b. Yield point (σs)

The phenomenon of metallic materials is produced, the sample does not increase (keep constant) during the tensile force and the elongation stress is called the yield point. If a drop in force occurs, a distinction should be made between upper and lower yield points. The yield point of the unit is N / mm2 (MPa). C. Yield point (σsu): The sample produces the maximum stress and forces the first drop; Lower yield point (σsl): The minimum stress is generated when the initial transient effect is excluded.

d. Elongation (σ)

In the tensile test, the sample was broken by a certain percentage of the specification to increase the original gage length, called elongation. Σ, the unit is%.

e. Cross-section shrinkage (ψ)

In a tensile test, the percentage of specimen fracture shrinks at the maximum reduced cross-sectional area, and the original cross-sectional area is called the cross-sectional shrinkage. Ψ is expressed in%.

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