New knowledge: Steel pipe special introduction

The evolution of steel pipe production technology in English began with the growth of the bicycle industry, the early development of oil extraction in the 19th century, and the manufacturing needs during both World Wars for ships, boilers, and aircraft. After World War II, the expansion of the chemical industry, along with the increasing demand for oil and gas drilling, mining, and transportation, significantly contributed to the diversification, production volume, and quality improvement of steel pipes. Steel pipes are not only used for transporting fluids and powdered materials, transferring heat, and creating mechanical components and containers, but they also serve as an economical form of steel. Their application in constructing architectural frameworks, columns, and mechanical supports helps reduce weight and save 20 to 40% of metal, enabling more efficient industrial construction. When used in road bridges, steel pipes save material, simplify installation, and greatly reduce the area requiring protective coatings, thereby cutting down on investment and maintenance costs. As a result, no other type of steel can fully replace steel pipes, although some structural profiles and bars can be substituted by them. Steel pipes play a crucial role in national economic development and the enhancement of living standards, far surpassing other steel products in importance. From everyday household appliances, furniture, water supply and drainage systems, gas pipelines, ventilation, and heating equipment to agricultural machinery, underground resource exploration, military and aerospace applications such as guns, missiles, rockets, and even bullets, steel pipes are indispensable. Steel pipes are categorized into two main types based on their production methods: seamless steel pipes and welded (seamed) steel pipes, with the latter often referred to as straight-seam pipes. Depending on the material, steel pipes can be classified into carbon steel pipes, alloy steel pipes, and stainless steel pipes. Based on the type of end connection, they can be divided into light pipes (without threaded ends) and thread pipes (with threaded ends). According to surface coating characteristics, they can be divided into black pipes (uncoated) and coated pipes. (1) GB3087-2008 "Seamless Steel Tubes for Low and Medium Pressure Boilers" specifies that the chemical composition test method follows the relevant sections of GB222-84 and GB223 "Methods for Chemical Analysis of Steel and Alloys." (2) GB/T5310-2008 "Seamless Steel Tubes for High Pressure Boilers" outlines that the chemical composition testing is conducted according to the relevant parts of GB222-84 and "Chemical Analysis Methods for Steel and Alloys" as well as GB223 "Method for Chemical Analysis of Steel and Alloys." (3) The chemical composition inspection of imported boiler pipes must be carried out in accordance with the standards specified in the contract. Sources: Information provided by industry standards and technical specifications.

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