-
Hot-expanded seamless steel pipe manufacturing process – cross rolling
Cross rolling is a rolling method between longitudinal rolling and cross rolling. The rolling of the rolled piece rotates along its own axis, deforms and advances between two or three rolls whose longitudinal axes intersect (or incline) in the same direction of rotation. Cross rolling is mainly u...Read more -
Cross-rolling piercing process and quality defects and their prevention
The cross-rolling piercing process is the most widely used in the production of seamless steel pipes, and was invented by the German Mannesmann brothers in 1883. The cross-rolling piercing machine includes two-roll cross-rolling piercing machine and three-roll cross-rolling piercing machine. The ...Read more -
Surface processing defects of seamless tubes and their prevention
Surface processing of seamless tubes (smls) mainly includes: steel tube surface shot peening, overall surface grinding and mechanical processing. Its purpose is to further improve the surface quality or dimensional accuracy of steel tubes. Shot peening on the surface of seamless tube: Shot peenin...Read more -
Factors affecting the quality of seamless tubes
There are two categories of factors that affect the quality of seamless tubes: steel quality and rolling process factors. Many factors of the rolling process are discussed here. The main influencing factors are: temperature, process adjustment, tool quality, process cooling and lubrication, remov...Read more -
How to control the defects on the inner surface of seamless tube?
The scarring defect in the hot continuous rolling seamless tube exists on the inner surface of the steel pipe, which is similar to the pit of the size of a soybean grain. Most of the scars have gray-brown or gray-black foreign matter. The influencing factors of internal scarring include: deoxidiz...Read more -
Warehousing inspection and loading and unloading of anti-corrosion spiral steel pipes
Everyone knows that when we transport all kinds of things, we need to check carefully, especially large-scale materials, which need to be checked two or three times before entering or leaving the warehouse. So how should the anti-corrosion spiral steel pipe be checked when entering and leaving th...Read more -
Causes and measures of uneven wall thickness of seamless tubes
The uneven wall thickness of the seamless tube(SMLS) is mainly manifested in the phenomenon of uneven wall thickness of the spiral shape, uneven wall thickness of the straight line, and thicker and thinner walls at the head and tail. The influence of continuous rolling process adjustment of seaml...Read more -
How to enhance the stability of spiral steel pipe?
Spiral welded pipe (ssaw) is a kind of steel pipe that combines low-carbon and environmentally friendly alloy structural steel and low-alloy structural characteristics into pipe material and electric welding. How can the reliability of the spiral pipe be improved in the process of adoption? When ...Read more -
Flattening test of seamless steel pipe
The production process of seamless steel pipes is relatively cumbersome and rigorous. After the seamless steel pipe is produced, certain tests must be carried out. Do you know the flattening test method and steps of the seamless steel pipe? 1) Flatten the sample: 1. The sample is cut from any par...Read more -
Weld leveling of straight seam steel pipe
Weld leveling of straight seam steel pipe (lsaw/erw): Due to the impact of the welding current and the influence of gravity, the internal weld of the pipe will protrude, and the external weld will also sag. If these problems are used in an ordinary low-pressure fluid environment, they will not be...Read more -
Low carbon steel tubing with seamless
Features: 1. Low carbon steel tubing with seamless is a carbon steel with a carbon content of less than 0.25%. It is also called mild steel because of its low strength, low hardness and softness. 2. The annealed structure of low carbon steel tubing with seamless is ferrite and a small amount of p...Read more -
DETECTION OF SURFACE DEFECTS OF SQUARE AND RECTANGULAR TUBES
There are five main methods for detecting surface defects of square and rectangular tubes: 1. Eddy current inspection Eddy current testing includes basic eddy current testing, far-field eddy current testing, multi-frequency eddy current testing, and single-pulse eddy current testing...Read more