2023-04-19

Seamless rectangular tube heat treatment has three advantages

In order to improve the surface hardness and wear resistance of the rectangular tube, seamless square rectangular tube manufacturers can carry out some surface treatment, that is, flame surface quenching, high and medium frequency surface quenching and some chemical heat treatment. Generally speaking, high and medium frequency surface quenching is mostly, and its heating temperature is 850-950 ℃. Considering its poor thermal conductivity, the heating speed cannot be too fast, otherwise it will produce defects of melting and some quenching cracks. High-frequency quenching requires seamless square tube after normalizing the matrix tissue is mainly pearlite. Cooling water spray or spray polyvinyl alcohol aqueous solution, tempering temperature in the range of 200-400 ℃, hardness in the 40-50HRC, can ensure the hardness and wear resistance of the surface of the seamless rectangular tube. In addition, seamless rectangular tube heat treatment also has the following three advantages: (I) Dimensional Stability For high-precision seamless rectangular tubes, it requires high precision, so dimensional stability must be maintained. Due to the slow cooling speed of straightening in the air, it has the effect of stabilization and will increase the number of residual seamless rectangular tubes in the organization, so cold treatment must be carried out; (II) Reduce Quenching Deformation Because seamless rectangular tubes are slender, they are easy to deform during quenching, so their deformation must be strictly controlled. Heat treatment is a very critical process. In the quenching and cooling process, cold plasticity is used for timely correction, which is the key step to ensure the improvement of the qualified rate. Therefore, thermal bath quenching or cooling in oil for a certain period of time should be carried out for thermal correction. At the same time, hanging heating should be carried out during heating to reduce the deformation of quenching. For high-precision guide rails, gas nitriding or ion nitriding should be carried out to reduce the deformation; (III) high hardness seamless square rectangular tube mainly bear contact fatigue load, it must have high hardness, so it should be quenched, or surface quenching or chemical heat treatment, followed by low temperature tempering treatment.

2023-12-01

Fangda Jiugang rolling mill multi-pronged approach to reduce the error rate of remarkable results

Recently, the rolling mill of Fangda Jiugang has taken a variety of measures to reduce the error rate, and the error time of each line has been greatly reduced compared with last year, which has achieved good economic benefits and laid the foundation for reducing costs and increasing efficiency. It is reported that in order to reduce the error rate, the factory has taken a series of effective measures: one is to reasonably arrange the production plan, reasonably match the variety specifications, and reduce the time for replacing the variety specifications; the second is to strengthen the management and control of the production process, establish a rapid response mechanism, and give full play to the role of production scheduling. When equipment or process failures occur in the production process, the production scheduling should mobilize capable forces to eliminate the failures as soon as possible, reduce the delay time of process and equipment; The third is to strengthen the spot check of equipment and technology, and implement the spot check responsibility system. If the spot check of equipment and workers is not in place, the responsibility shall be investigated. The fourth is to carry out "horse racing" to reduce the time of missed flight, reward those who effectively reduce the time of missed flight, and severely assess the missed flight caused by equipment and technology. Through a series of effective measures, the error rate of each line has dropped significantly compared with the same period last year. As of November, the delay of bar equipment was 3092 minutes lower than that of last year. The delay of high bar technology decreased by 1568 minutes compared with last year, and the delay of equipment decreased by 2513 minutes compared with last year. The delay of high-speed wire technology decreased by 19996 minutes compared with last year, and the delay of equipment decreased by 8555 minutes compared with last year. The delay of medium plate process decreased by 962 minutes compared with last year, and the delay of equipment decreased by 3323 minutes compared with last year.

2023-12-01

Ministry of Industry and Information Technology: steel to capacity cap target is expected to be completed two years ahead of schedule

According to media sources, at the National Industry and Informatization Work Conference held on the 27th, Miao Wei, Minister of Industry and Information Technology, said that since the beginning of this year, despite difficulties and challenges exceeding expectations, the industrial communications industry has remained generally stable and stable. With progress, high-quality development has been steadily advanced. Miao Wei also said that by the end of this year, it is expected to complete the 0.15 billion-ton steel production capacity ceiling target set by the 13th five-year Plan two years ahead of schedule, and maintain a high-pressure situation of strict investigation and crackdown on illegal resumption of production, reconstruction and new production capacity in the electrolytic aluminum, cement and flat glass industries.

2023-05-25

Five Forming Methods of Seamless Rectangular Square Tube

What is the forming method of seamless rectangular tube? Attention should be paid to the specific bending Rashen forming/bending space and the quality of the reflected product, or when the actual effect of thinning is produced, the actual effect of tightening/A thickening is produced. The rectangular square tube of the wire produces concave side edges, vertical expansion and contraction of the waste water pipe, and it is not easy to straighten. 1. The empty disadvantage is that the bent upper tube is/empty bend side synchronization time, because the working pressure forming force of the upper roller and the lower roller is simply beyond the zero boundary point, the edge part produces concave instability, in addition, it also reflects the actual operation of the smooth module and its production quality. It is in turn characterized by rectangular square tubes and tubes that produce gas bends. 2. When the telescopic perimeter is helpless to prevent the solid state from being bent, for example, the bending strength of the upper end tube/side bending of the rectangular frame is terminated. Gas bending can also be bending

2023-06-16

What are the ways to increase the service life of seamless square tubes?

Seamless square tube in everyone's daily life can often be seen by everyone, then everyone is not to master the way to increase the service life of seamless square tube are what? The following detailed for everyone detailed introduction:

2023-06-17

How to ensure the welding and welding of seamless rectangular tubes?

Seamless rectangular tube in the arc welding welding welding guarantee system, the key has five levels. With these five levels ensured, the quality of the seamless rectangular tube can also be ensured.