How to Connect and Cut 304 Stainless Steel Pipes?

304 stainless steel pipe is a universal stainless steel material with stronger anti-rust performance than 200 series stainless steel materials. It is also good in high temperature resistance and can maintain good corrosion resistance below 800 degrees. 304 stainless steel pipe has excellent stainless corrosion resistance and good resistance to intergranular corrosion.

How to connect 304 stainless steel pipes？

1. Press-fit type

The press-fit type connection of 304 stainless steel pipe is actually very simple, and is mainly divided into two types: "single press" and "double press". Press-fit type connection is a stable connection method. The pipe fittings are clamped on the pipe using hydraulic pliers, and water is stopped by O-rings to achieve a tighter connection effect. Press-fit type connection is easy to operate, has good sealing, and cannot be disassembled after clamping.

2. Assembly type

The assembly type connection of 304 stainless steel pipe is simpler and more convenient than the compression type connection. It can be connected quickly by just plugging and twisting.

3. Welding type

Welding type connection is welded by hot melt process, and the connection strength is high, but this method is highly dependent on the craftsmanship of the welder, and the quality is difficult to guarantee.

4. Groove type

The groove type connection is to tighten the nut of the pipe fitting so that the expansion convex ring pipe and the stainless steel pipe fitting are axially compressed, and the connection effect is achieved through the water stop of the conical sealing ring. This method is very convenient to install and remove, but the cost of forging the clamp is very high.

5. Socket welding type

The socket welding type connection is to insert the stainless steel pipe into the pipe fitting, and then we connect the stainless steel pipe fittings by argon arc welding, so that the 304 stainless steel pipe fittings are self-melted into one. This connection is very reliable and basically does not require maintenance in the later stage.

6. Threaded connection

The threaded connection of 304 stainless steel pipe is that the stainless steel pipe fittings and pipes are directly tightened like screws, that is, the inner and outer connection parts are tightened together. This method can achieve bare-hand installation, which is simple, convenient and fast to achieve the connection effect.

7. Flange type

Flange type connection is to connect two stainless steel pipes with flanges by tightening bolts. This connection method can be said to be very mature, with relatively high connection and pressure bearing performance, and can also be disassembled, but the cost is relatively high.

How to cut 304 stainless steel pipes?

1. Grinding wheel cutting

It is to use a high-speed rotating grinding wheel to cut the 304 stainless steel pipe. This is a common and effective stainless steel pipe cutting method. It can cut the 304 stainless steel pipe quickly and accurately, but some burrs will be generated at the end of the stainless steel pipe after cutting. Use a stainless steel pipe burr remover or a correct and effective method to remove burrs to achieve better results. Straight-line cutting may only have a grinding wheel, but this is sufficient for most purposes.

2. Laser cutting

Laser cutting uses a focused high-power density laser beam to irradiate the stainless steel surface, causing the irradiated material to quickly melt, vaporize, ablate or reach the ignition point. At the same time, the molten material is blown away by the high-speed airflow coaxial with the light beam, so as to cut the 304 stainless steel tube. The energy is highly concentrated, the heating is rapid, the cutting speed is fast, the cutting quality is good, and various complex shapes of stainless steel materials can be accurately and effectively cut, and the cost of subsequent process treatment is low. However, the price of laser cutting equipment is quite expensive, and it is only suitable for large enterprises to use in large-scale production.

3. Wire cutting

Wire cutting is developed on the basis of EDM perforation and forming processing.

It is a processing method that uses a moving metal wire (molybdenum wire, copper wire or alloy wire) as an electrode wire. The pulse spark discharge between the electrode wire and the 304 stainless steel tube generates high temperature to melt or vaporize the metal, thereby forming a slit and cutting out parts. This cutting method is burr-free and has a smooth incision, but the stainless steel pipe will discolor slightly after cutting and requires subsequent grinding. It is complicated and inefficient and is not suitable for large-scale use.

4. Plasma cutting

The plasma cutting method was invented in the 1950s. It is a processing method that uses the heat of a high-temperature plasma arc to locally melt (and evaporate) the metal at the cut of the workpiece, and uses the momentum of high-speed plasma to remove the molten metal to form a cut. This method is fast, but there will be some metal residue on the inner wall of the 304 stainless steel pipe after cutting, which needs to be cleaned and plasma cut. The stainless steel pipe mouth will have some discoloration, the cut is not smooth, and it is easy to cause cutting quality problems.

Read more: 304 Stainless Steel Pipes Wall Thickness Specifications

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