Product Description of Large-Diameter Hot-Rolled Seamless Steel Pipe
Release time:
2026-03-23
Abstract: Large-diameter hot-rolled seamless steel pipe is an important steel product widely used in petroleum, chemical, and construction industries. Its main characteristics include high strength, corrosion resistance, and seamless construction, enabling it to withstand high pressure and high temperature environments. This article will detail its production process, technical parameters, application areas, and market prospects.
Detailed Content:
Large-diameter hot-rolled seamless steel pipe refers to seamless steel pipe with an outer diameter greater than or equal to 89mm, typically produced using a hot-rolling process. Its main raw materials are high-quality carbon steel and alloy steel, which are manufactured through processes such as heating, piercing, diameter expansion, and cooling. Due to its excellent mechanical properties and corrosion resistance, it is widely used in petroleum, natural gas, chemical, construction, and shipbuilding industries.
1. Production Process
The production process of large-diameter hot-rolled seamless steel pipe mainly includes the following steps:
Raw Material Preparation: Select high-quality steel billets, usually round or square.
Heating: Heat the steel billets to a certain temperature to achieve a plastic state, facilitating subsequent processing.
Piercing: A piercing machine is used to pierce the heated steel billet, forming a hollow tube blank.
Expanding: The tube blank is expanded using an expanding machine to achieve the required outer diameter and wall thickness.
Cooling: Cooling treatment ensures the hardness and strength of the steel pipe.
Inspection: Strict quality inspection is performed on the finished product, including appearance, dimensions, and mechanical properties.
2. Technical Parameters The main technical parameters of large-diameter hot-rolled seamless steel pipes include:
Outer Diameter: Typically ranges from 89mm to 1000mm.
Wall Thickness: Generally between 5mm and 50mm.
Length: Can be customized according to customer requirements; common lengths are 6 meters and 12 meters.
Material: Commonly used materials include 20#, 45#, 16Mn, and Q345B.
Standards: Mainly conforms to national standards such as GB/T 8162 and GB/T 8163.
3. Application Areas Large-diameter hot-rolled seamless steel pipes have a wide range of applications, mainly including:
Oil and Gas Industry: Used for transporting fluids such as oil and natural gas, and withstanding high pressure and high temperature.
Chemical Industry: Used in chemical equipment, pipelines, etc., exhibiting excellent corrosion resistance.
Construction Industry: Used in building structures, bridges, etc., providing strong support.
Shipbuilding: Used in ship hull structures, exhibiting good compressive and bending resistance.
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