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Seamless carbon pipe is very important kinds of steel pipe, seamless tube material is round tube, pipe cutting through the growth of the embryo to the degree of cutting machine is about one meter of the blank, and by conveyor belt to the furnace heating. The billet is fed into the heating furnace, the temperature is about 1200 degrees celsius. Fuel is hydrogen or acetylene. Furnace temperature control is the key issue. Released after round tube piercing machine to go through the pressure of wearing empty. Generally more common punch is tapered roller punching machine, punching machine such high production efficiency, product quality, perforated expanding capacity, can be worn a variety of steel. After perforation, round tube has been three-roll rolling, rolling or extrusion. To squeeze off the pipe after sizing. Sizing mill into high-speed rotating cone drill through perforated steel embryo formed steel. Pipe inside diameter is determined by the outside diameter sizing mill drill length. After sizing the pipe into the cooling tower through spray cooling pipe after cooling, it is necessary to be straightened.

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Stainless steel seamless pipe is a very widely used seamless tube, then the petrochemical industry, as well as natural gas, fertilizer industry has used. The stainless steel and carbon seamless tubes, there is some difference, this difference is mainly refers to the different rules in both stainless steel design above exist, that is to say, these two seamless dry, The above rules redesign is not capable of universal. The main difference between stainless steel seamless carbon tube and has the following three. First, when the production of stainless seamless pipe, is used in the form of cold, work hardening of stainless pipe, such as stainless tube during bending when it is to have this all heterosexual, but also That is, the performance of horizontal and vertical stainless steel pipe is different.

There are a diverse range of stainless steel fasteners like stainless steel bolts and nuts offering different levels of corrosion resistance and strength. They are used for corrosive industrial and seawater environments, equipment, structural and architectural applications. These products can be used for all stainless steel designs and for joining other metals such as copper, aluminum, carbon steel, and zinc.

Stainless steel fasteners (stainless steel bolts) can be manufactured by either machining or cold heading. Machining is the oldest method of fastener production, and it is still specified for very large diameters and small production runs.

Therefore, at the time of production, the form may be used to increase the cold strength, however, to be noted that the curved area of the stainless steel seamless pipe, is relatively small compared with the total area or negligible when the time for which increase the intensity of the above, you can then to a certain extent, improve the safety factor of stainless pipe. Second, there stainless steel tube shape with a stress-strain curve is not the same. The elastic limit of the stainless steel seamless pipe, about fifty percent yield stress around while the yield stress, the yield stress of the steel hell. The third point is that stainless seamless pipe, there is no yield point, and the presence of carbon seamless pipe is the yield point.

Cold heading is the more common production method. It transforms wire into the desired shapes by applying enough pressure to cause the metal to plastically deform into the die and punch cavities without preheating the material. Larger production runs of galvanized bolts, screws, nails and rivets are made by cold heading, but special custom runs can also be made by this method. Cold heading can significantly increase the strength of 300-series types stainless steel fasteners (stainless steel bolts).

The ASTM International standards for fastener materials and specific products (bolts, nuts, screws, and studs) are provided in the following table. There are standards for both general use and for specialized high temperature, high pressure, and cryogenic applications.

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