News
-
Anti corrosion of buried steel pipes in urban sewage
Several methods can be used for anti-corrosion of urban sewage buried pipelines: 1. Petroleum bitumen-glass fiber cloth coating This kind of anti-corrosion method was used more in oil pipelines, but it is now being eliminated. Its advantages are wide sources of raw materials a...Read more -
Annealing steps for straight seam steel pipes
Annealing of straight seam steel pipe is to heat the steel pipe to the temperature and keep it at this temperature and then slowly cool it to room temperature. Annealing includes annealing, spheroidizing annealing, and stress relief annealing. 1. Heating the steel pipe to a pr...Read more -
Performance comparison of spiral steel pipe and straight seam steel pipe
1. Welding process In the welding process, the welding method of the spiral steel pipe and the longitudinal welded pipe is the same, but the longitudinal welded pipe inevitably has many T-shaped welds, so the probability of welding defects is greatly increased, and the welding...Read more -
The main production process of large diameter straight seam welded pipe
1. Plate exploration: After the steel plate used to manufacture large-diameter submerged arc welded straight seam steel pipe enters the production line, the full plate ultrasonic inspection is first performed; 2. Edge milling: double-sided milling of the two edges of the steel...Read more -
Method of cutting steel pipe
The main methods of steel pipe cutting are pipe cutting machine cutting, machine cutting, flame-cutting, sawing, and so on. The characteristics of the pipe cutting equipment are as follows. (1) Pipe cutting machine The pipe cutting machine has simple equipment, less investment...Read more -
Industrial Steel Pipeline Cleaning and Purging
The purge and cleaning of the steel pipeline is an indispensable process of the installation process. The purge and cleaning are determined by the steel pipeline and the installation process. The conventional method is: 1. First, use a clean water pump to pump the clean water ...Read more -
What are the details of the thick-walled steel pipe before use
1. Thick-walled steel pipe cutting: According to the actual required pipeline length, the pipe should be cut with a metal saw or a toothless saw. When water welding is used in the cutting process, the raw materials should be protected accordingly. When cutting, fire-resistant ...Read more -
Introduction of anti-corrosion of inner wall of large diameter steel pipe
1. Before processing all steel pipes, the steel plate on the inner wall of the large-diameter steel pipe should be trusted, and it is required to reach the metal luster (whitening). It should reach the sa2.5 standard required in the “Surface Rust Grade and Derusting Grad...Read more -
Method for preventing quenching cracks of medium and high carbon low alloy steel pipes
(A) If the entire steel pipe is cooled to the martensitic transformation stop temperature (Mf point) or lower by strong water quenching, quenching cracks will occur with high probability. (B) Since the cracks at the time of quenching cracking extend substantially in the axial ...Read more