Causes of Cracking of Seamless Steel Pipes
Recently, the small partners of our company often encountered customer feedback in the process of talking to them. In his previous shopping experience, he often encountered the problem of broken steel pipes, which led to serious product quality problems and led to the bankruptcy of the company. a great loss. Next, Permanent Steel Manufacturing Co., Ltd. will give you an analysis of what are the main factors that cause the cracking of seamless steel pipes.
What are the main factors that cause seamless steel pipe cracking? There are mainly the following points:
1. Raw material selection
To save cost, some seamless steel tube manufacturers will use round steel produced by small steel plants for processing, but round steel produced by these small steel plants will have a lot of impurities, bubbles, interlayers, pores, etc., that will be easily removed. Cause cracks after processing. Difficulty. PMC steel pipe round bars are purchased from Baosteel, Huaigang, and other high-quality round bars, and the source is reliable.
2. Inadequate heat treatment temperature control
Small manufacturers do not have professional production experience and technology. The workshop workers cannot guarantee whether the steel pipe is heat-treated only on the basis of the temperature and duration of heating, and the heat treatment will change the mechanical properties of the steel pipe. However, generic manufacturers do not have clear indicators for various steel grades, wall thicknesses, mechanical properties, etc., and there is no test equipment to determine if the pipe has reached the performance indicators required by the customer.
How does PMC control production?
Each batch of steel pipe produced by PMC Steel Pipe has clear temperature and speed indicators for normalization, annealing, and tempering, and a tensile test will be performed to determine if the product meets the performance required by the customer. These data parameters are used as the basis of production to ensure the sustainability of product quality and customer end-use, rather than relying on the experience of a certain worker to determine, it is the main factor with which Why PMC Steel Pipe has been cooperating with many well-known companies in the industry for more than ten years.
3. Straightening Strength
Straightening equates to secondary deformation. During straightening, a two-pronged force is applied. If the operator is not experienced enough, the straightening force is too strong and the thick wall pipe will cause internal damage and cracks if the strength of the thick wall pipe is not well controlled. This is also the cause of the steel pipe breaking at a later stage.
4. Drawing deformation
If the stretch deformation is too great, cracks will also form in the steel pipe, causing the steel pipe to crack during further processing. The glossy tube has low elongation, generally 7-8%, the higher the distortion, the lower the elongation; Small deformation, great elongation. Some smaller manufacturers trim and cut corners to preserve craftsmanship. All three warps became two free reprint items, causing the warp to expand and crack due to excessive stress.