Special-shaped steel pipe is a low alloy structural steel with a protective rust layer and resistance to atmospheric corrosion, which can be used to manufacture steel structures such as vehicles, Bridges, towers, and containers. Compared with ordinary carbon steel, the shaped steel pipe has better corrosion resistance in the atmosphere. Compared with stainless steel, the special shaped pipe has only a trace of alloying elements, and the special shaped steel pipe generally adopts the process route of fine feeding-smelting (converter, electric furnace - micro-alloying treatment - argon blowing -LF refining - low superheat continuous casting (feeding rare earth wire)- controlled rolling and controlled cooling. The special-shaped pipe is an economic section steel pipe. Special-shaped steel pipes include non-circular cross-sectional profiles, equal wall thickness, variable wall thickness, variable diameter and variable wall thickness along the length direction, symmetrical and asymmetric sections, etc. It is widely used in aviation, automobile, shipbuilding, mining machinery, agricultural machinery, construction, textile and boiler manufacturing. During the smelting process, the scrap steel is added to the furnace with the charge and smelted according to the conventional process. After the steel is produced, the deoxidizer and alloy are added. The molten steel is treated by argon blowing and then cast immediately. Due to the addition of rare earth elements in the steel, the special-shaped steel pipe is purified and the content of inclusions is greatly reduced.

The energy-saving requirements of stainless steel pipe and the call of society to restore the natural environment are also getting higher and higher. In order to meet these requirements, new stainless steel shaped pipes will be developed, and new smelting processes and new equipment will appear accordingly. While the degree of mechanization and automation of casting production continues to improve, it will be more developed to flexible production to expand the adaptability of different batch and multi-variety production. Priority will be given to new technologies that save energy and raw materials, while new processes and equipment that produce little or no pollution will be given priority. Machines and equipment for special casting and many transportation and material handling equipment. The production of cast stainless steel shaped pipe has different characteristics from other processes, mainly wide adaptability, more materials and equipment, and environmental pollution.

Special-shaped steel pipe is a kind of special shape pipe, which has a long life and a wide range of use. The current main market situation is good, and the recent price fluctuations are a little, and the rebound of steel has also brought good profits to some companies. The technical aspects of China's special-shaped steel pipe industry are now gradually improved, and major manufacturers are paying more and more attention to the introduction of talent and the development of science and technology, so the production cost is reduced, and the profit will naturally be more. In the context of the current overcapacity, the industry is generally concerned that once there is a large profit space, the steel mill's resumption of production and enthusiasm for increasing production will increase the supply pressure in the future market. In fact, steel mills have resumed production and signs of increased production have begun to appear in the near future.

The development of the entire stainless steel pipe industry in China has shown an unbalanced state, in the current situation of the surging volume of the stainless steel pipe industry, the source of raw materials is very tight, the domestic supply is seriously insufficient, basically relying on imports to maintain the original development. In the case of rising iron ore, it also increases the cost of stainless steel, which is difficult to compete in today's fierce market competition, causing difficulties to the production and operation of enterprises. In addition, the main technical and economic indicators still need to be further improved, China's hot-rolled finished steel (billet-material) yield of about 93%, of which, hot-rolled seamless stainless steel pipe (billet-material) yield, depending on the level of its technical equipment fluctuate greatly, technical rolling mill is generally 90-92%; Backward technology rolling mill is only about 80%; Rolling mill is more than 75%, backward rolling mill is less than 70%.