Classify the steel and pipe according to its usage
Pipes for pipelines: carbon steel seamless steel pipe for water, gas, and steam pipelines, pipes for oil transportation, pipes for natural gas transmission, and pipes for agricultural irrigation such as hosepipes and sprinkler pipes.
Pipes for thermal equipment: pipes for general boilers, boiling water pipes, superheated steam pipes, superheated pipes for locomotive boilers, large, medium, and small smoke pipes, arched brick pipes, high temperature and high pressure boiler pipes, etc.
Pipes for the machinery industry: aviation structure pipes (round pipes, oval pipes, and flat oval pipes), half shaft pipes for automobiles, axle pipes for cars and tractors, pipes for oil coolers of tractors, square and rectangular pipes for agricultural machines, pipes for transformers, and pipes for bearings.
Pipes for petroleum geological drilling: oil drilling pipes, oil rods (square rods and hexagonal rods), drill collars, oil pipes, oil casings, and various pipe joints and geological drilling pipes (core pipes, casings, active drill rods, drill collars, clips, and pin joints, etc.).
Pipes for chemical industry: cracking pipes for petroleum, pipes for chemical equipment heat exchangers and pipelines, stainless acid-resistant pipes, high-pressure pipes for fertilizers, and pipes for conveying chemical media.
Pipes for other industries: pipes for containers (pipes for high-pressure gas cylinders and general containers), pipes for instruments and meters, pipes for watch cases, and pipes for injection needles and medical devices.
Classify steel and pipe according to its material
Steel pipes can be divided into carbon pipes and alloy pipes, steel pipe wholesale, etc. according to their pipe-making materials (i.e. steel grades). Carbon pipes can be divided into ordinary carbon steel pipes and high-quality carbon structural pipes. Alloy pipes can be divided into low-alloy pipes, alloy structural pipes, high-alloy pipes, high-strength pipes, bearing pipes, heat-resistant and acid-resistant stainless steel pipes, precision alloy pipes (such as Kovar alloy), and high-temperature alloy pipes, etc.
How to buy steel and pipe?
Choose pipes with a uniform overall color, smooth and flat inner and outer walls, and no defects that affect surface performance such as bubbles, depressions, and impurities.
Check if the product labeling is complete. The steel and pipe should have the manufacturer's name or trademark, production date, product name, specification size, implementation standard number, etc. The pipe should have the product name, nominal outer diameter, pipe series S, the font should be clear, and check if the labeling is consistent with the actual product.
Buy pipes and fittings of the same brand. Because the raw materials of products from different brands may be different, unfavorable factors may occur during the welding of pipes and fittings, which may cause leaks at the welding joints in long-term use.
Good quality steel and pipe has high strength, but not unbreakable. Therefore, the quality of steel and pipe cannot be judged by whether they can be broken when dropped. Since the impact resistance of steel pipe is better than that of true steel and pipe, steel pipe is often easily broken, and those that are not broken are often real steel pipes.
