Requirements on pipe billet for hot-rolled seamless tube

Requirements on pipe billet for hot-rolled seamless tube is related to and pipe varieties, uses and piercing methods.

For general-purpose steel pipe tube quality requirements can be relaxed more, but the quality of important applications of tube steel and high-alloy steel pipe requirements must be strictly. Stress conditions better or lesser amount of deformation perforation method, without affecting pipe performance conditions, the tube surface and internal quality requirements may be slightly lower. Stress disadvantaged two-roll rotary piercing, if a large amount of deformation perforation, then the tube surface and internal quality have strict requirements. In short, steel tube technical condition is to ensure the quality and smooth production process as the basis to determine, and with different methods vary perforation, with the technical conditions of steel to improve and increase. Technical conditions can be found on a variety of tube standards and technical protocols.

Such as general automatic rolling machine for tube requirements are as follows:

(1) Deviation in Table 1 tube diameter Dp. Tube bending of any part of the ≤6mm / m, tube end face of the cut slope ≤6 ~ 8mm, flattened tube end face of ≤8% Dp;

(2) Tube surface without cracks, hairline, scarring, scaly layer, folding, non-metallic inclusions and residual shrinkage. Not allowed height or depth of more than 0.5mm small grooves, pitting, ears and height of more than two-sided ears of 1mm. Cleanup tube defects deeper than 0.05Dp;

(3) Low magnification tube: not allowed ≥1 level of residual shrinkage, bubbles, anti-leather, white spots and cracks. For the average carbon structural steel billet, which generally loose ≤3 level, center porosity ≤3 level, segregation ≤3 level, subcutaneous bubbles ≤2.



Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.


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