Straight Seam Welded Pipe

Material:

Q235A, Q235B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 20#, Q345, L245, L290, X42, X46, X70, X80, etc.

Dimensions：

The outer diameter of straight seam steel pipes usually ranges from 10mm to 2060mm, and the wall thickness ranges from 1mm to 100mm‌1. Specifically, the size specifications of straight seam steel pipes are as follows:

Wall thickness: 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.5mm, 2.8mm, 3.0mm, 3.2mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, etc.‌

Description：

Straight seam welded pipe, the pipe made of hot-rolled or cold-rolled steel plate or steel strip coiled and welded by straight seam welding on welding equipment is called straight seam welded pipe.

Q235A, Q235B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 20#, Q345, L245, L290, X42, X46, X70, X80, etc.

The specifications and dimensions of straight seam steel pipes mainly include parameters such as outer diameter, wall thickness and length. According to the standard GB/T3091-2008, the specification range of straight seam steel pipes is as follows:

‌Outer diameter‌: The outer diameter range of straight seam steel pipes is relatively wide, ranging from small diameter to large diameter. The outer diameter of small-diameter straight seam steel pipes is generally below 300mm, while the outer diameter of large-diameter straight seam steel pipes exceeds 500mm, and the maximum can reach 2020mm‌.

‌Wall thickness‌: There are also many options for the wall thickness of straight seam steel pipes, and the common wall thickness ranges from 0.5mm to 3.5mm‌.

‌Length‌: The length of straight seam steel pipes is usually between 300mm and 1200mm, and the specific length can be customized according to needs‌.

1. In addition to direct use, straight seam steel pipes will continue to be processed according to the purpose of construction, and the relevant processing technologies include forging steel, extrusion, cold rolling, and drawing steel. Among them, forging steel is processed by the working pressure of the equipment to extrude the blank into the shape, specifications and size we need.

2. Extrusion processing is generally used for the production of rare metal steels. Generally, the steel placed in the extrusion cylinder is extruded by one side of the pressure, and then it is extruded out of the die hole. Cold rolling and drawing steel often cause changes in the cross-section and length of straight seam steel pipes.

3. The use of straight seam steel pipes is relatively common, so there are many specifications according to the use. Straight seam steel pipes are used in various fields. When in water projects and farmland irrigation, it is mostly for liquid transportation functions in drainage pipes, etc., but in industries such as petrochemicals and chemical plants, it is often used to transport liquefied gas and compressed natural gas.

Specifications and dimensions‌:

‌Outer diameter‌: The outer diameter of large-diameter straight seam steel pipes is usually greater than 500mm, and the maximum can reach 2020mm‌.

‌Wall thickness‌: The wall thickness ranges from 2mm to 80mm‌.

‌Length‌: Usually 300mm to 1200mm, and can also be fixed or multiple lengths‌.

‌Material‌:

Common materials include Q235A, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X70, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.‌ ‌Production process‌:

‌Double-sided submerged arc welding‌: This is the main production process for large-diameter straight seam steel pipes, including plate probing, milling, pre-bending, forming, pre-welding, internal welding, external welding, ultrasonic inspection, X-ray inspection, and expansion. ‌Standard‌:

Common domestic standards include GB/T3091-2008, GB/T9711.1-1997, and API 5L‌1. ‌Mechanical properties‌:

‌Yield strength‌: 415MPa to 565MPa‌2. ‌Tensile strength‌: 520MPa to 760MPa‌2. ‌Weld tensile strength‌: ≥520MPa‌2.