Bending process of 304 stainless steel pipe

Bending process of 304 stainless steel pipe

304 stainless steel is a common material in stainless steel with a density of 7.93 g/cm³; it is also called 18/8 stainless steel in the industry, which means it contains more than 18% chromium and more than 8% nickel; it is resistant to high temperatures of 800°C and has good processing performance , with the characteristics of high toughness, it is widely used in industrial and furniture decoration industries and food and medical industries. However, it should be noted that compared with ordinary 304 stainless steel, food-grade 304 stainless steel has stricter content indicators. For example: The international definition of 304 stainless steel is that it mainly contains 18%-20% chromium and 8%-10% nickel, but food-grade 304 stainless steel contains 18% chromium and 8% nickel, which is allowed to fluctuate within a certain range, and Limit the content of various heavy metals. In other words, 304 stainless steel is not necessarily food grade 304 stainless steel. During the bending process, smoothness, accurate angles, and no bursting are required.



Round tube bending method

1.Hot bending method

First, make several rollers on the arc car according to the outer diameter of the 304 stainless steel round pipe, then fix the rollers firmly on the iron plate, fill the iron pipe with sand, plug both ends with wooden plugs, and use flame to heat the bending position.

2. Cold bending method

First, make several rollers on the arc car according to the outer diameter of the 304 stainless steel round pipe, then fix the rollers firmly on the iron plate, fill the iron pipe with sand, plug both ends with wooden plugs, and use flame to heat the bending position.

Process difficulties

During the machining process, the friction between the workpiece and the tool will generate higher heat and easily wear the tool. Therefore, the requirements for tool materials are relatively strict, requiring wear resistance and high temperature resistance. And meet the sharp edges. The processing speed is slow because the cutting force is large, resulting in low production efficiency. In addition, due to the high heat, choosing a good cooling oil, usually using sulfur chloride, will have better results. The harder things are actually drilling deep holes and tapping. Therefore, when processing 304 stainless steel round pipes, the experience and technology of workers should be excellent.

Precautions

1. Bend pipe

The normal requirements for R of round pipe bends are: the bending core radius (center line) R ≥ 1.5~2 times the diameter. If the R angle is too small, the R corner of the pipe will become flat when it is bent. The bending R angle of the same pipe should generally be maintained - this can satisfy the consistency of the wheel mold. The length of the straight edge of the elbow is required to be ≥ 2 double diameters, otherwise the elbow mold cannot be clamped smoothly.

2. Process hole

Process holes should be reserved for pipes involving welding to discharge welding slag.

3. Processing performance

First of all, we should pay attention to the processing performance of 304 stainless steel round pipe. Stainless steel cutting has high plasticity and toughness, high cutting energy consumption, high cutting temperature, low thermal conductivity of stainless steel, and improper heat dissipation treatment can easily lead to an increase in tool temperature. Stainless steel has strong bonding and weldability, and it is easy to produce debris tumors when cutting. Stainless steel has a strong tendency to work harden, and a hardened layer is easy to form on the cutting surface. Stainless steel is not easy to chip and will become clogged during cutting, affecting the cleanliness of the stainless steel surface. The above is an introduction to the bending process of 304 stainless steel round tubes. I believe you also have a simple understanding.