无缝异型钢管是指具有保护锈层耐大气腐蚀，可用于制造车辆、桥梁、塔架、集装箱等钢结构的低合金结构钢。与普碳钢相比，无缝异型钢管在大气中具有更优良的抗蚀性能。与不锈钢相比，无缝异型管只有微量的合金元素，异型钢管一般采用精料入炉-冶炼(转炉、电炉-微合金化处理-吹氩-LF精炼-低过热度连铸(喂入稀土丝)-控轧控冷等工艺路线。无缝异型管为经济断面钢管。异型钢管包括横断面轮廓非圆形的、等壁厚的、变壁厚的、沿长度方向变直径和变壁厚的、断面对称和不对称的等。其广泛应用在航空、汽车、造船、矿山机械、农业机械、建筑、轻纺以及锅炉制造等方面。在冶炼时，废钢随炉料一起加入炉内，按常规工艺冶炼，出钢后加入脱氧剂及合金，钢水经吹氩处理后，随即进行浇铸，吹氩调温后的钢水经连铸机铸成板坯。由于钢中加入稀土元素，异型钢管得到净化，夹杂物含量大为减少。
Seamless special-shaped steel pipe is a kind of low alloy structural steel with protective rust layer and atmospheric corrosion resistance, which can be used to manufacture steel structures such as vehicles, bridges, towers and containers. Compared with ordinary carbon steel, seamless special-shaped steel pipe has better corrosion resistance in atmosphere. Compared with stainless steel, the seamless profiled pipe has only a small amount of alloy elements. The profiled pipe generally adopts the process of refining-smelting (converter, electric furnace-microalloying treatment-argon blowing-LF refining-low superheat continuous casting (feeding rare earth wire) -controlled rolling and cooling. Special-shaped pipe is economic section steel pipe. Special-shaped steel pipe includes non-circular cross-section outline, equal wall thickness, variable wall thickness, variable diameter and wall thickness along length direction, symmetrical and asymmetrical cross-section and so on. It is widely used in aviation, automobile, shipbuilding, mining machinery, agricultural machinery, construction, textile and boiler manufacturing. During smelting, scrap steel is added into the furnace together with burden, and is smelted according to conventional process. After tapping, deoxidizer and alloy are added. After argon blowing, molten steel is casted immediately. After argon blowing, the molten steel is casted into slab by continuous caster. Due to the addition of rare earth elements in steel, the special-shaped steel pipe is purified and the inclusion content is greatly reduced. 不锈钢异型钢管节能的要求和社会对恢复自然环境的呼声也越来越高。为适应这些要求，新的不锈钢异型管将得到开发，冶炼新工艺和新设备将相应出现。铸造生产的机械化自动化程度在不断提高的同时，将更多地向柔性生产方面发展，以扩大对不同批量和多品种生产的适应性。节约能源和原材料的新技术将会得到优先发展，少产生或不产生污染的新工艺新设备将首先受到重视。供特种铸造用的机器和设备以及许多运输和物料处理的设备。铸造不锈钢异型管生产有与其他工艺不同的特点，主要是适应性广、需用材料和设备多、污染环境。
The requirement of energy saving for stainless steel special-shaped steel pipes and the voice of society for restoring natural environment are also increasing. To meet these requirements, new stainless steel profiled tubes will be developed and new smelting processes and equipment will appear accordingly. With the continuous improvement of mechanization automation in foundry production, more flexible production will be developed in order to expand the adaptability to different batches and varieties of production. New technologies that save energy and raw materials will be given priority, and new processes and equipment that produce little or no pollution will be given priority. Machines and equipment for special foundry, as well as many transportation and material handling equipment. The production of cast stainless steel profiled pipe has different characteristics from other processes, such as wide adaptability, more materials and equipment needed, and environmental pollution.
无缝异型钢管是一种特殊形状的管材，它寿命长，使用范围广泛。目前的主要市场形势不错，而且近期价格有点小波动，钢材的反弹给一些企业也带来了不错的利润。我国无缝异型钢管行业技术方面现在正是逐渐完善的，而且各大厂家都越来越注重人才的引进与科技的发展，所以生产成本降低了，利润自然也会更多一点。在当前产能过剩的背景下，业内人士普遍担忧，一旦有较大的盈利空间，钢厂的复产、增产热情将令后市供应压力大增。而在实际上，钢厂复产、增产迹象已经于近期开始显现。
Seamless special-shaped steel pipe is a kind of pipe with special shape. It has a long service life and a wide range of applications. At present, the main market situation is good, and the recent price is a little fluctuating. The rebound of steel has also brought good profits to some enterprises. China's seamless special-shaped steel pipe industry technology is now gradually improving, and major manufacturers are increasingly focusing on the introduction of talent and the development of science and technology, so the production cost has been reduced, and profits will naturally be a little more. In the current context of overcapacity, the industry is generally concerned that once there is a greater profit margin, the enthusiasm of steel mills to resume production and increase production will increase the supply pressure in the future. In fact, signs of reopening and increasing production in steel mills have begun to emerge in the near future.
我国不锈钢异型钢管的整个行业发展呈现出不平衡的状态，在当前不锈钢管产业量猛增的形势下，原料的来源十分的紧张，国内的供应量严重不足，基本上主要依靠进口原来来维持发展。在铁矿石上涨的情况下也同时增加了不锈钢成本，对于如今市场竞争激烈的情况下，很难竞争，给企业的生产经营造成困难。另外，主要技术经济指标尚需进一步改善，我国热轧成品钢材(坯-材)成材率在93%左右，其中，热轧无缝不锈钢管(坯-材)成材率，视其技术装备水平不同波动较大，技术先进轧机一般为90-92%;技术落后轧机仅为80%左右;先进轧机为75%以上，落后轧机为70%以下。
The development of stainless steel special-shaped steel pipe industry in China is unbalanced. In the current situation of rapid growth of stainless steel pipe industry, the source of raw materials is very tight, and the domestic supply is seriously insufficient, basically relying on imports to maintain development. In the case of iron ore rising, it also increases the cost of stainless steel. It is difficult to compete in today's fierce market competition, which makes the production and operation of enterprises difficult. In addition, the main technical and economic indicators still need to be further improved. The yield of hot-rolled finished steel (billet-material) in China is about 93%. Among them, the yield of hot-rolled seamless stainless steel tube (billet-material) fluctuates greatly depending on the level of technical equipment. The advanced rolling mill is generally 90-92%. The backward rolling mill is only about 80%. The advanced rolling mill is more than 75%, and the backward rolling mill is less than 70%.
