How to deal with the problem of uneven wall thickness of precision seamless steel pipes in the production process? The uneven wall thickness of the steel pipe is mainly reflected in the uneven wall thickness of the spiral, the uneven wall thickness of the linear wall, and the uneven wall thickness of the head and tail. The influence of continuous rolling process adjustment is an important factor leading to the uneven wall thickness of the finished pipe. The reasons for the uneven wall thickness of the spiral are as follows: due to adjustment reasons such as irregular rolling centerlines of the piercing machine, unequal inclination angles of the two rolls, or too small front pressure at the head, the wall thickness is uneven, and generally spiral along the entire length of the steel pipe. spread. During stress annealing, the small-diameter precision seamless steel pipe undergoes internal partial plastic deformation (when the stress exceeds the yield strength of the material at this temperature) or a partial relaxation process (when the stress is less than the yield strength of the material at this temperature) Relax the residual stress at a certain temperature to achieve the purpose. During the stress annealing process, the...
Duplex Stainless Steel Coil One is that duplex stainless steel with chromium content in the range of 18%-22% has excellent neutral chloride stress corrosion resistance under low stress conditions. 18-8 austenitic stainless steel, which is usually used in neutral chloride solutions above 70Y, is more prone to stress corrosion cracking, and heat exchangers made of this type of stainless steel are used in industrial media with trace amounts of chloride and hydrogen sulfide Equipment such as evaporators and evaporators are prone to stress corrosion cracking, but duplex stainless steel has good resistance. The second is that chromium-containing duplex stainless steel has good corrosion resistance. When having the same pitting equivalent value, the critical pore corrosion potential of duplex stainless steel and austenitic stainless steel is relatively similar. The pitting corrosion resistance of duplex stainless steel containing 18% chromium is equivalent to that of 316L. Duplex stainless steel containing 25% chromium, especially nitrogen-containing high-chromium duplex stainless steel, has higher pitting and crevice corrosion resistance than 316L stainless steel. The third is that it has good corrosion resistance fatigue and wear corrosion performance, and is used to make pumps, valves and other equipment under certain corrosive medium conditions. In addition, the comprehensive...
Stainless steel has excellent comprehensive performance, appearance and surface properties, and is widely used in all stages. Similarly, stainless steel pipes are no exception. Stainless steel pipe is a kind of hollow section steel, usually divided into stainless steel seamless pipe and welded pipe. There are some differences in processing methods and performance. The difference is: 1. Variations in the production process After the steel plate or strip is rolled, the stainless steel welded pipe is welded together to form equipment and molds. There are usually welds on the inner wall of the pipe, and the seamless pipe is made of round pipe blanks as raw materials, which are drilled, cold-rolled, and cold-drawn through the hot extrusion production process, and there are no welds in the pipe. 2. Differences in the appearance of steel pipes For stainless steel welded pipe, the tolerance of the wall thickness is very small, and the thickness is very uniform throughout the circumference. The steel pipe has high precision, the inner and outer surfaces of the pipe have high brightness, and the length can be set arbitrarily. The precision of the seamless steel pipe is low, the wall thickness is uneven, the brightness of the...
The raw materials of our company’s stainless steel products are all from well-known manufacturers, such as TISCO. Recently, the 304, 316, 1.4301, 1.4401 stainless steel hot-rolled and cold-rolled coils produced by TISCO in accordance with American and European standards have passed the PER certification of the British pressure equipment quality management system. After years of hard work and accumulation, various stainless steel, carbon steel, alloy steel billets, wire rods, medium plates, coils, and fine strips produced by TISCO in accordance with European standards, American standards, and Japanese standards have successively passed the pressure-bearing equipment of the European Union. Quality management system PED certification, best-selling overseas. After the UK leaves the EU, EU certification is no longer recognized, and access to the UK market must be certified by its designated agency. In order to further meet user requirements and expand overseas markets for stainless steel, the Manufacturing Department will lead relevant production plants and departments to actively promote PER certification. After preliminary planning, on-site research, data submission, on-site pre-examination, first audit, test witness, problem rectification and other stages, the relevant products have successfully passed the PER certification and are qualified to export to the UK pressure equipment field. The annual supply...
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