无缝异型钢管的生产是非常严格的，因一点差异就会导致其成品报废，异型钢管是以精密冷拔无缝钢管经黑色或灰色磷化工艺处理，并对磷化后的钢管进行封闭及防锈处理而做成的精密液压无缝钢管。无缝异型钢管内外表层形成致密的磷化层，再经防锈处理后有效防止钢管氧化，所以钢管的防锈性能很好，同时由于钢管表层磷化后形成的微孔磷化膜(层)，可以强有力将油漆附着在钢管表层，有效防止油漆脱落的现象，对于用于野外作业的环境中是理想的产品。
The production of seamless special-shaped steel pipe is very strict, because a little difference will lead to the scrap of its products. The special-shaped steel pipe is a precise hydraulic seamless steel pipe made by precise cold-drawn seamless steel pipe treated by black or grey phosphating process, and the phosphated steel pipe is sealed and rust-proof. The inner and outer surface of seamless special-shaped steel pipe forms a dense phosphating layer, which can effectively prevent the oxidation of the steel pipe after anti-rust treatment, so the anti-rust performance of the steel pipe is very good. At the same time, the micro-porous phosphating film (layer) formed after phosphating on the surface of the steel pipe can strongly attach the paint to the surface of the steel pipe and effectively prevent the phenomenon of paint falling off. It is an ideal product for field operation environment. 使用无缝异型钢管时建议用户在钢管弯曲完成后做擦洗，例如用海绵运用压缩空气进行经过式擦洗的办法，当然液压系统正常工作前的系统预擦洗也是必须的步骤。
When using seamless special-shaped steel pipe, the user is advised to do scrubbing after the bending of the steel pipe is completed, such as using sponge to use compressed air to carry out through scrubbing, of course, the pre-scrubbing of the system before the normal operation of the hydraulic system is also a necessary step.
液压系统中使用的钢管主要是异型钢管和平常无缝钢管，无缝异型钢管尽管有着优良的机械性能，但由于价格高价位，精度低，未能获得广泛使用。而平常无缝钢管尽管使用广泛，但其机械性能较差，精度比较低，使用之前通常要经过一系列的焊接、试装、酸洗、碱洗、水洗、长期串油、试漏，工序繁杂、费时、费材不可靠，且一直未能彻底清除管内残余物，成为整个液压系统随时发生故障的一大忧患。椐统计，液压系统中有70%的故障就是这一原因造成的。
The steel pipes used in hydraulic system are mainly special-shaped steel pipes and ordinary seamless steel pipes. Although seamless special-shaped steel pipes have excellent mechanical properties, they have not been widely used because of their high price and low precision. Although seamless steel pipe is widely used, its mechanical properties are poor and its accuracy is relatively low. Before its use, it usually passes through a series of welding, trial-fitting, pickling, alkali washing, water washing, long-term oil string, leak testing, complicated procedures, time-consuming, unreliable materials, and has not been able to thoroughly remove the residues in the pipe, which has become a major trouble for the whole hydraulic system to break down at any time. Statistics show that 70% of the faults in hydraulic system are caused by this reason.
