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Causes of missing plating in hot dip galvanizing of seamless steel pipes
Causes and solutions of missing plating caused by hot-dip galvanizing of seamless steel pipes: 1. The surface of the plated parts is not clean ⑴The surface of the plated parts contains paint, grease, and solder; it can be polished or scrubbed with related solvents. ⑵ iron oxid...Read more -
Forming method and connection type of large-diameter steel pipes
At present, the main production process of large-diameter steel pipes in my country is hot-rolled large-diameter steel pipes and thermally expanded-diameter steel pipes. The largest size of thermally expanded seamless steel pipes is 325 mm-1220 mm and the thickness is 120mm. T...Read more -
The purpose of preheating the industrial steel pipe before welding the spiral steel pipe
The purpose of the spiral steel pipe preheating before welding is as follows: (1) Preheating can slow down the cooling rate after welding, make hydrogen diffuse in the weld metal and escape, and avoid cracking caused by hydrogen. It can also reduce the degree of hardening of w...Read more -
What is the difference between BA-grade stainless steel pipe fittings and Ep-grade stainless steel pipe fittings
Classification of stainless steel pipe fittings AP, MP, BA, EP AP<MP<BA<EP. AP: Acid Pickling. Use acidic solutions such as nitric acid and fluorous acid to remove the oxide layer of the steel pipe. Cheap and fast, but it is easy to cause grain boundary corrosion, and...Read more -
Identification method of fake and inferior steel pipes
1. Fake and inferior thick-walled steel pipes are prone to folding. Folding is a variety of fold lines formed on the surface of thick-walled steel pipes, and this defect often runs through the longitudinal direction of the entire product. The reason for the folding is that the...Read more -
Fireproof properties of steel structures
Steel is a non-combustible building material that is resistant to earthquakes and bending. In practical applications, steel can not only increase the load capacity of buildings relatively, but also meet the needs of architectural design aesthetics, and avoid the defects of con...Read more -
The scope of use of seamless steel pipe products
1. Structural seamless steel pipe (GB/T8162-1999): mainly used for general structure and mechanical structure. 2. Seamless steel pipe for conveying fluid (GB/T8163-1999): mainly used for conveying pipelines. For example central air conditioning, cold storage, gas, fire enginee...Read more -
Influence of strength anisotropy of UOE steel pipe on compressive strength
In the last 10 years, to transport natural gas, deep water research projects of laying pipelines on the seabed have been carried out. In the long-distance transportation of natural gas, the pipeline is required to have compressive strength against external water pressure under...Read more -
Large diameter hot rolled seamless steel pipe
High-frequency welded pipes are generally completed by processes such as cold rolling, high-frequency welding, and forming. It is a kind of seamed pipe. Seamless steel pipes are divided into hot-rolled seamless pipes and cold-drawn seamless pipes. Hot-rolled pipes are made by ...Read more