Q345B seamless steel pipe is widely used

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Q345B seamless steel pipe is now widely used in our life, so the original 16Mn seamless steel pipe and the current Q345B seamless steel pipe is actually not much different, just changed the name.

However, there are certain differences between the two, but this difference is very small. Many uses, physical principles, and physical properties are the same, but the Q345B seamless steel pipe is chemically different from the 16Mn seamless steel pipe. The advantage of the Q345B seamless steel pipe is in this different chemical composition. See what kind of place you want to use. The advantages of hot-rolled seamless steel pipe can damage the foundry structure of the steel ingot, refine the grain of the steel, and eliminate the defects of the microstructure, thereby making the steel structure dense and the mechanical properties improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; bubbles, cracks and looseness formed during casting, 12cr1mov alloy tube can also be welded under high temperature and pressure Hehe.

Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes. Advantages of hot-rolled seamless steel pipe: it can destroy the foundry structure of steel ingot, refine the grain of steel, and eliminate the defects of microstructure, so that the steel structure is compact and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer an isotropic body to some extent; bubbles, cracks and looseness formed during casting, Q345B seamless steel pipe can also be under the action of high temperature and pressure Soldering. Q345B seamless steel pipe is widely used. The general-purpose seamless pipe is rolled from ordinary carbon structural steel, low-alloy structural steel or alloy structural steel, and has the largest output, and is mainly used as a pipe or structural part for conveying fluid.

According to the use, the three types of supply are supplied according to chemical composition and mechanical properties; according to the mechanical performance supply, the water pressure test is supplied. Steel pipes supplied in categories a and b, if used to withstand liquid pressure, are also subjected to hydrostatic testing. Special-purpose seamless pipes include boiler seamless pipes, geological seamless steel pipes, and petroleum seamless pipes. The seamless steel tube magnetic experiment is the easiest way to differentially austenite without rust steel and ferrite without rust steel. Austenite has no rust steel error magnetic steel, but it will be slightly magnetic after cold pressing under large pressure; and the authentic chrome-plated steel and low-alloy steel are strong magnetic steel. The obvious characteristic of the Wangshui point experiment without rust steel pipe is that it is in the solid part of the corrosion resistance of the concentrated aqua regia and the rare king water. This feature makes it easy to distinguish from the vast majority of the remaining non-metals or alloys.

The seamless steel pipe is then used to drip the cholesteric filtrate into the cleared sea area with a drop bottle. In general, carbon steel or iron will form a layer of nominal non-metallic copper in a few minutes, and in the absence of stainless steel, copper deposits or copper color will not appear. Sulfuric acid submerged without rust steel pipe experiments can distinguish between 302 and 304 and 316 and 317. The trimming of the specimen shall be finely ground, and then the volume of the depth is 20 to 30%, and the aqua regia (ratio of 1.42) measuring 60 to 66 °C is washed and passivated for half an hour. The sulfuric acid experimental filtrate has a volume depth of 10% and is heated to 71 ° C. When the .302 and 304 steels are immersed in this hot filtrate, they are rapidly eroded and a small amount of follicles occur, and the sample is blackened in a few seconds; The sample of 317 steel was not eroded or the reaction was very slow (no viable foam), and the sample did not change face within 10~15 seconds.

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