In the production process of seamless pipe, there are cold hardening and hydrogen embrittlement phenomenon, they are caused by cold drawn seamless pipe cracking the main reason. In this paper, two phenomena were analyzed and some measures to prevent cracking of small caliber seamless steel tubes wer
The base material of anti-corrosion steel pipe mainly includes straight seam steel pipe, spiral steel pipe and seamless steel pipe, and has a wide range of applications. 3PE anti-corrosion steel pipe is suitable for high-rise building water supply, heating network heating, water supply engineering,
Cold-rolled tube refers to steel product that is through cold drawing, cold-formed, cold drawn, cold plate or strip processed at room temperature. The advantages of the cold tube:1,good quality. Cold drawn tube production principle is a stretch, from the shortage of pipe to finished tube to pull at
Pickling rustGenerally, using chemical and electrolysis ways to do pickling processing pipeline anti-corrosion chemical pickling can remove the oxide scale, rust, old coatings, and sometimes used as a sand-blasting after reprocessing. Although chemical cleaning can reach the surface cleanliness and
1 Thermal expansion of pipe material after straightening the head and tail were cut at first, simply cut necking and pulling empty section and tail section cracked, cut no more; the end face to ensure smooth, not skewed; 2 Finishing classes at the test bench to be treated Flaring material surface in
After pickling stainless HRC, both sides of the strip section width 8-18mm long pass prevailing rough band called rollover. Since rollover after cold rolling can not eliminate a direct impact on the quality of cold-finished surface, so the general trimming delivery. In actual production, we should t
The residual defects in erw steel pipe ultrasonic testing is an important reason for failure of the weld, causing defects missed is inappropriate due to a probe parameter selection, disturbing wave effects and burr flaw echo echo does not distinguish between such a variety of factors. Steel ultraso
Hot straight seam steel pipe manufacturers, the small caliber in the output of crude oil or heating pipes, in order to reduce the heat pipes to the soil, outside the pipe plus insulation composite layer. Commonly used insulation material is a rigid polyurethane foam, a temperature of -185 ~ 120 ℃. T
Any open at both ends and having a hollow cross section, and a relatively large cross-section of steel whose length and perimeter, can be called steel pipe. When comparing hour length and cross section perimeter, may be referred to the pipe section or tubular parts, they all belong to the category o
