Recently, the company’s small partners often encountered customer feedback in the process of talking with customers. In their previous experience of procurement, they often encountered the problem of cracking of the purchased steel pipe, which led to serious product quality problems and caused the company. Next Permanent Steel Manufacturing Company Ltd will give you an analysis of what are the main factors of seamless steel pipe cracking.
What are the main factors that cause seamless steel pipe cracking?
There are mainly the following points:
1 Raw material selection
In order to save costs, manufactures of some seamless steel pipe will use round steel produced by small steel plants for processing, but the round steel produced by these small steel plants will contain many impurities, bubbles, interlayers, pores, etc., which will cause cracks after post-processing easily. PMC steel pipe round bars are purchased from Baosteel, Huaigang and other high-quality round bars, which is reliable source.
2 Inadequate heat treatment temperature control
Small manufacturers do not have production experience and technology at professional level. Workers of Workshop cannot guarantee whether the heat treatment of the steel pipe is in place based on the heating temperature and duration alone, and the heat treatment will change the mechanical properties of the steel pipe. However, general manufacturers do not have clear indicators for different steel grades, wall thicknesses, mechanical properties and no testing equipment to determine whether the pipe has reached the performance indicators and requirement of the customer.
How does PMC control production?
Each batch of steel pipes produced by PMC steel pipes has clear temperature and speed indicators for normalizing, annealing and tempering, and a tensile test will be carried out to determine whether the product meets the performance required by the customer. These data parameters are used as the basis for production to ensure the stability of the customer's product quality and end use, rather than just relying on the experience of a certain worker to determine, this is the main factor why PMC steel pipe has been cooperating with many well-known enterprises in the industry for more than ten years.
3 Straightening strength
Straightening is equivalent to secondary deformation and Two-way force is applied during straightening. If the operators are not experienced enough, the straightening force is too strong, and the thick-walled pipe will cause internal damage and cracks if the strength of the thick-walled pipe is not well controlled. In the later stage, this is also the reason for the cracking of the steel pipe.
4 Drawing deformation
If the drawing deformation is large, steel pipe cracks will also be formed, causing the steel pipe to crack during the later processing. Bright tube has low elongation, generally 7-8%, large deformation, low elongation; small deformation, high elongation. Some small manufacturer cut corners and cut corners to save craftsmanship. The three deformations were changed to two Computer Technology Articles, which expanded the deformation and caused excessive stress to cause cracking.
How Is The Crack On The Surface Of The Seamless Steel Pipe?
The cleanliness and smoothness of the surface of the seamless steel pipe is a requirement for the selection of a seamless steel pipe. The cleanliness of the surface of the seamless steel pipe has become a key point for the customer to choose. In recent years, it has been valued by many companies. Cracks on the surface of seamless steel pipes are a common phenomenon and a direct cause of low sales. So what are the factors? First, the raw material factors: the poor quality of the tube blank will appear inside and outside the skin, crusting, cracks, etc. Second, the temperature factor: the first important process of seamless steel pipe production is heating, poor heating (uneven, insufficient temperature, etc.) will cause internal skin, etc. Third, the equipment factor: from the beginning of the furnace, each equipment component will affect the final quality of the pipe. For example, if the equipment parts are scratched, it will cause the outer skin and pits; if the punching machine is not smooth, the head of the tube blank will be bitten by water and bite into the head or the inside of the head. Fourth, the process problem: the process problem is also quite complicated, there are adjustment problems, problems with equipment failure, and the quality of the pipe produced after the wear of the process components (head, guide, rolls, etc.). The problems caused are all-encompassing. Therefore, there are dozens of possible reasons for the occurrence of a defect. If you do not see the physical object or are not at the production site, it is often difficult to say the specific reasons.
You must be logged in to post a comment.