Stainless steel pipe is a kind of hollow long round steel, which is widely used in industrial transmission pipelines and mechanical structural parts such as petroleum, chemical, medical, food, light industry, mechanical instruments, etc. In addition, when the bending and torsional strength are the same, the weight is relatively light, so it is also widely used to manufacture mechanical parts and engineering structures. It is also commonly used as furniture and kitchenware.

Bearing steel pipe refers to hot rolled or cold rolled (cold drawn) seamless steel pipe used for manufacturing ordinary rolling bearing rings. The outer diameter of the steel pipe is 25-180 mm, and the wall thickness is 3.5-20 mm, which is divided into ordinary precision and higher precision.

螺栓，英语“螺栓”;“螺栓连接（准确标题）”;“锚（早期标题）”是当代煤矿巷道支护的最基本组成部分。它一起加固了巷道的围岩，使周围的岩石支撑着自己。现在锚杆不仅用于矿山，还用于斜坡、隧道和大坝主体加固的工程技术。

规定了DIN 2391第1部分所列尺寸的冷加工无缝精密钢管的交货技术条件，这些钢管由St30Si (1.0211) 、St30Al (1.0212) 、St35 (1.0308) 、ST35 (1.0408) 、St52 (1.0580) 钢种制成。这种管主要用于需要尺寸精度和可能的小壁厚、特定表面条件和特定机械性能的地方。