What is the Difference Between Seamless Stainless Steel Pipe and Stainless Steel Pipe?

The chemical composition of seamless stainless steel pipes is different from that of seamed stainless steel pipes. The steel components used to produce seamless pipes only meet the basic requirements of ASTM. The steel used to produce joints contains chemicals suitable for welding. For example, silicon, sulfur, manganese, oxygen and triangular ferrite are mixed in proportion to produce welding flux, which easily transfers heat during the welding process, so that the entire weld is completely fused. Such chemical-free steel pipes, such as seamless steel pipes, will produce various unstable elements during the welding process, making the welding hard and impermeable. The following Alloy Seamless Steel Tubing Supplier will share with you the difference between tubes seamless stainless steel pipes and stainless steel:

Alloy Seamless Steel Tubes

1. Concentricity

During the manufacturing process of stainless steel punching blanks at a temperature of 2200°F, the steel is softened and formed by punching and spiral drawing in the hole cutter. Therefore, the tube wall thickness and eccentricity are not uniform. Therefore, ASTM ensures that the wall thickness of seamless steel pipes is greater than the difference between the gaps in the seam pipe. Grooved tubes are formed by precision cold-rolled thin plates (4-5 feet in width per roll). Such cold rolled sheets generally have a maximum thickness difference of 0.002. The sheet is cut into width πD, where d is the outer diameter of the tube. The thickness tolerance of the slit tube is small, and the wall thickness is very uniform on the entire circumference.

2. Welding performance

Generally, the chemical composition of sewn pipes and seamless pipes have different understandings. The steel composition used in the production of seamless pipes only meets the basic development requirements of ASTM. The steel used for production joints contains a chemically reactive substance suitable for welding. For example, silicon, sulfur, manganese, oxygen and triangular ferrite are mixed in proportion to produce a weld flux that can easily transmit heat during welding, so that our entire weld is completely penetrated.

3. Granularity

The particle size of the metal is related to the heat treatment temperature and the time to maintain the same temperature. The grain size of the slotted stainless steel tube is the same as that of the seamless stainless steel tube. If the joint pipe is subjected to minimum cold treatment, the particle size of the weld is smaller than that of the weld metal. Otherwise, the particle size is the same.

4. Pipe strength

Due to the strength of the pipe in the alloy composition, it has the same strength and the same heat treatment alloy steel pipe and the seamless stainless steel pipe joint is basically the same.

5. Corrosion resistance

Corrosion resistance also depends on the composition of the alloy. The seamless stainless steel pipe has the same chemical composition and corrosion resistance as the fully heat-treated slotted stainless steel pipe. In an acid chloride environment, welded joints in slotted steel pipes that are not sufficiently heat treated will accelerate corrosion, but this is only necessary for corrosion testing.

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