Recently, in the process of talking with customers, our company's small partners often encounter customer feedback, In their previous purchasing experience, they often encountered the problem of cracking of purchased steel pipes, which led to serious product quality problems and caused heavy losses to the company, Then the small editor of Tianzhan company will give you an analysis of what is seamless Cracking of steel pipe The main factors.
Steel pipe drawing
What are the main factors causing cracking of seamless steel pipe? The main points are as follows:
1. Selection of raw materials
In order to save cost, some seamless steel pipe manufacturers will Round steel produced by small steel plants is selected for processing, but the round steel produced by these small steel plants will contain many impurities, bubbles, interlayer, air holes, etc. after processing in the later stage, it is easy to cause cracking, Changzhou Tianzhan steel tube round steel is purchased from Baosteel, Huaigang, Zhongtian, Xingcheng and other high-quality manufacturers, with reliable source.
Cracking of steel pipe
2. The temperature control of heat treatment is not in place
Small manufacturers do not have professional production experience and technology, workshop workers can not guarantee whether the steel pipe heat treatment is in place by relying on the heating temperature and time, and heat treatment will change the mechanical properties of steel pipe. but General manufacturers for different steel grades, wall thickness, mechanical properties, no clear indicators, nor testing equipment to determine whether the pipe has reached the performance indicators required by customers.
How is the exhibition controlled?
day Each batch of steel pipes produced by Zhanjiang steel pipe has clear temperature and speed index for normalizing, annealing and tempering, and tensile test will be carried out to determine whether the products have reached the performance required by customers. These data parameters are used as the basis for production, so as to ensure the stability of customer's product quality and terminal use, This is the main reason why Tianzhan steel has cooperated with many well-known enterprises for 16 years.
Heat treatment of steel pipe
3. Straightening strength
Straightening is equivalent to secondary deformation. During straightening, two-way force is applied, such as The operators are inexperienced, the straightening force is too hard, and the thick wall pipe is not well controlled, which will cause internal injury and crack of the steel pipe. The later stage is not detected, and it is directly packed and delivered, This is also the reason for the later cracking of steel pipe.
Straightening steel pipe
4. Drawing deformation
If the deformation of drawing is too large, the steel pipe crack will be formed, which will cause the steel pipe cracking in the process of later processing. The elongation of bright tube is low, generally 7-8%, with large deformation and low elongation; Small deformation and high elongation. In order to save the process, some small manufacturers have changed the deformation from three times to two times, which enlarges the amount of deformation, resulting in excessive stress and cracking.
5. The steel pipe is not cut off completely
Many manufacturers blindly pursue yield, steel pipe old man only cut a few centimeters, steel pipe two ends cracking The hidden danger is not removed completely, This is also one of the factors leading to cracking in later use.
Steel pipe old man cutting
The above 6 points are compiled by Tian Zhan In order to summarize what is the main cause of seamless steel pipe cracking, Tianzhan steel pipe has 16 years of production experience, providing professional customized solutions for many well-known customers in the industry, Welcome new and old customers to discuss with us.