Seamless pipe flaring test

Many users in some processing applications need to be seamless steel tube end expanding to a certain size, then connected with other parts, such as men's bicycle front leading pattern seamless steel pipe support, you can take a closer look.

Tubing and Casing, Line Pipes
Seamless steel tube needs to be expanding, squash purpose:

Is generally 57mm outer diameter, in the end 70mm flaring, arranged for rolling bearing, of course this is one example, there are a lot of. Compressed but also to subsequent processing used in compressed under the situation of seamless steel tubes, similar to the flaring.

Flaring and flattening of seamless steel tubes, the experimental results and the factors which related?

Factors associated with not much, main seamless steel tube extends the higher the value, the lower strength values, flaring and flattening of the more perfect. The carbon content of the steel is lower, sulfur and phosphorus content is low, will be more perfect!In the use of state to ferrite based alloy steel pipe. Chromium content in 11%~30%, has a body centered cubic crystal structure.

This kind of steel is not generally contain nickel, sometimes also contain a small amount of Mo, Ti, Nb wait for element, this kind of steel with high heat conductivity, thermal expansion coefficient is small, good oxidation resistance, stress corrosion resistance superior features, much used in the manufacture of atmospheric water vapor, water resistance, and oxidation of acid corrosion of parts.

This kind of alloy steel pipe has poor plasticity after welding, plastic and corrosion resistance obviously reduce the disadvantages, which limits its application. The secondary refining technology ( AOD or VOD ) can be used to make carbon, nitrogen, gap elements are greatly reduced, thus making this kind of steel is widely used. Is the austenite and ferrite organization each account for about half of the alloy steel pipe. In C containing lower, the content of Cr in 18%~28%, Ni content in 3%~10%. Some steel also contains Mo, Cu, Si, Nb, Ti, N and other alloy elements. This kind of steel with austenitic and ferritic alloy steel pipe features, compared with ferrite, plasticity, toughness and higher, no brittleness at room temperature, intergranular corrosion resistance and welding performance were significantly increased, while also maintaining a ferritic alloy steel pipe for 475 ℃brittleness and high coefficient of heat conductivity, with superplasticity characteristics of.

And austenitic alloy steel, high strength and intergranular corrosion resistance and resistance to chloride stress corrosion is improved obviously. Duplex Alloy Steel with excellent resistance to pitting corrosion, is also a kind of nickel alloy steel.

Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.