Why Did The Seamless Steel Pipe Need Flaring?

1. The purpose of flaring and squashing of seamless steel pipes needs to be done:Many users in certain processing applications need to flaring one end of a seamless steel pipe or ssaw steel pipe to a certain size before connecting to other parts, such as the seamless steel pipe bracket of the front faucet pattern of a man's bicycle. You can carefully Observe. The outer diameter is generally 57mm. There is a 70mm flare at one end. It is used for rolling bearings. This is an example. There are many more. Squashing is also used for the seamless steel pipes that are used in the subsequent processing and are flattened. Similar to the flaring, I will not say much here. I believe we all understand it.

2. What are the factors related to the experimental results of flaring and flattening seamless steel tubes?Relatively few factors, mainly the higher the extension value of the seamless steel pipe, the lower the strength value, the better the flaring and flattening. The lower the carbon content of steel, the lower the sulfur and phosphorus content, the better!

In the use of state-based ferritic alloy steel pipe. Chromium content of 11% to 30%, with body-centered cubic crystal structure. This type of steel generally does not contain nickel, and sometimes contains a small amount of Mo, Ti, Nb and other elements, these steels have large thermal conductivity, small expansion coefficient, good oxidation resistance, excellent resistance to stress corrosion, etc., steam, water and oxidizing acid corrosion parts. Such alloy steel tubes have the disadvantages of poor plasticity, significantly reduced post-weld plasticity and corrosion resistance, and thus limit its application.

The application of off-furnace refining technology (AOD or VOD) can greatly reduce the gap elements such as carbon, nitrogen, etc., thus making this type of steel widely used. Austenitic and ferritic alloy steel pipe about half. In the case of lower C content, the Cr content is 18% to 28%, and the Ni content is 3% to 10%. Some steels also contain alloying elements such as Mo, Cu, Si, Nb, Ti, and N. This type of steel combines the characteristics of austenitic and ferritic alloy steel tubes. Compared with ferrite, it has higher plasticity and toughness, no brittleness at room temperature, significantly improved resistance to intergranular corrosion and welding performance, and it also maintains Ferritic alloy steel pipe has high brittleness and high thermal conductivity at 475°C, and has superplasticity.

Compared with austenitic alloy steel tubes, the strength and resistance to intergranular corrosion and chloride stress corrosion resistance are significantly improved. Duplex alloy steel pipe has excellent pitting corrosion resistance, and is also a kind of nickel alloy steel pipe.