Difference of 20# Precision pipe and seamless steel pipe

1, 20 # precision tube main characteristic is a welding seam, can withstand greater pressure. Products can be very rough as-cast or cold dial.

2, 20 # precision tube is the product appeared in recent years, mainly is the inner hole, the size of the outer wall with strict tolerance and roughness.

The characteristics of the 20 # precision tube

1. The outer diameter smaller.

2. High precision to do small batch

3. Cold drawn finished products of high precision, good surface quality.

4. The steel pipe transverse area is more complex.

5. Steel pipe is superior performance, dense metal.

20 # precision tube difference after hot rolling

Hot-rolled # 20 precision work slab or slab continuous casting round billet as a raw material, by step heating furnace, high pressure water descaling into the roughing mill, after roughing expected by the cutting head, tail, and then into the finishing mill, and the implementation of computer control rolling and finishing after through laminar cooling and the winder, become straight hair volume. Straight hair volume of head and tail often show tongue shape and fish shape, thickness and width accuracy is poorer, side often exists defects such as wave shape, folding, tower. The volume weight is heavier, coil diameter is 760 mm. To pass through the cutting head and cutting tail straight hair volume, trimming and straightening, level off of multichannel time after finishing line processing, cutting board or heavy volume, again become namely: hot rolled steel plate, flat hot-rolled coil, slitting and belt and other products. Hot rolling finishing if volume after acid pickling to remove scale and greased the hot-rolled pickling plate volumes.