Tel: +8613511656218

Address: No.118 Beihuan Road, East Steel City, XiShan District, WuXi, Jiangsu, China

Home > Knowledge > Content
The use of seamless steel pipe and the method of removing embroidery (一)
Nov 28, 2018

Seamless steel pipe is a kind of long steel with hollow cross section and no seam around it.

It is made of ingot or solid tube billet by perforation into a wool tube, which is then made by hot rolling, cold rolling or cold dialing.


Use of seamless steel pipe:

1. Seamless steel pipe is widely used.


General purpose seamless steel pipe is rolled by ordinary carbon structural steel, low alloy structural steel or alloy structural steel, the most produced, mainly used as a pipeline or structural part to transport fluids.


2. There are three types of supply depending on the purpose:


A, according to chemical composition and mechanical properties supply;


b, according to the mechanical properties of the supply; C, according to the water pressure test supply.


Steel tubes supplied in categories A and B, if used to withstand liquid pressure, are also subject to hydraulic tests.


3, special purpose of seamless pipe has a boiler seamless pipe, geological seamless steel pipe and oil seamless pipe and so on.


Seamless steel pipe fake identification:

1. Counterfeit seamless steel pipe is easy to scratch, the reason is shoddy seamless steel pipe manufacturers simple equipment, easy to produce burrs, scratching the steel surface. Deep scratches reduce the strength of the steel.

2.Counterfeit seamless steel pipe without metallic luster, pale red or similar to the color of pig iron.

 3.Fake seamless steel pipe transverse bar is fine and low, often appear to be dissatisfied with the phenomenon, the reason is that manufacturers in order to achieve large negative tolerances, the first few lines of the finished product under the pressure is large, iron type is small, hole type filling dissatisfaction.

 4.The cross section of the shoddy seamless steel pipe is elliptical, because the manufacturer in order to save the material, the finished roller in front of the ER DAO pressure is large, the strength of this seamless steel pipe greatly decreased, and also does not meet the standard of seamless steel pipe dimensions.

 5. High-quality seamless steel pipe composition is uniform, cold shearing machine tonnage is high, cutting head end smooth and neat, and shoddy seamless steel pipe because of poor material, cutting head end will often have the phenomenon of falling meat, that is, uneven, and no metal luster.

And because of shoddy manufacturers of products cut their heads less, the head and tail will appear big ear.

6. Fake seamless steel pipe material contains many impurities, the density of steel is small, and the size is serious, so in the absence of vernier caliper, it can be weighed and checked.

In general, the effect of integer proportionality will be better, mainly considering the problem of cumulative error and probability theory.


Previous: The use of seamless steel pipe and the method of removing embroidery (二)

Next: Maintenance method of Stainless steel