Pickled Surface Seamless Carbon Steel Tube St45 for Mechanical and Engineering Structures

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Product Description

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Basic Information
Model NO.
ST45
Type
Seamless
Technique
Cold Drawn
Material
Carbon Steel
Surface Treatment
Oiled
Section Shape
Round
Origin
China
Capacity
10000 Tons Per Month
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Product Description
Seamless pipe is a hollow tubular steel without welding seams, which is made by perforated hot rolling, cold drawing or cold rolling process. It features a uniform structure, high strength, and excellent sealing properties.
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Hot-rolled seamless pipe: Thick wall thickness, large outer diameter range, suitable for high pressure and high strength scenes.
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Cold rolled / cold drawn seamless pipe: High precision, smooth surface, uniform wall thickness, mostly used for precision machinery.
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Specifications & Standards
Feature Detail Description
Size Range OD: 1/8” - 24” (5.0mm-716mm) Various diameters available
Wall Thickness 0.3mm-26mm SCH20, SCH40, STD, XS, SCH80, SCH160, XXS
Material Grades ASTM 106 Gr.B, API 5L Gr.B, ASTM A 53 Gr.B High-quality carbon steel
Surface Treatment Bared, Black Painted, Galvanized, Oiled Anti-corrosion coatings available (PE, 3PE, FBE)
Technique ERW, EFW, DSAW, Cold Drawn Multiple production methods
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Hot Selling Sizes
Nominal Size (Inch) OD (mm) SCH40 WT (mm) SCH80 WT (mm) SCH160 WT (mm)
1/2"21.32.773.734.78
3/4"26.72.873.915.56
1"33.43.384.556.35
2"60.33.915.548.74
4"114.36.028.5613.49
8"219.18.1812.723.01
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Applications

1. Industrial Pipelines: Fluid transportation for water, oil, gas, and steam.

2. Machinery: Automobile drive shafts, bicycle frames, and hydraulic cylinder barrels.

3. Construction: Supporting columns for bridges and high-rise buildings.

4. Chemical & Petroleum: Oil well pipes and corrosive medium transportation.

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Performance Features
Mechanical properties: High strength without welds, suitable for high pressure and impact loads.
Corrosion resistance: Optional galvanizing, epoxy coating, or stainless materials (304/316L).
Process performance: Excellent weldability and processability for bending or expanding.
Sealing: Weld-free design ensures maximum sealing for gas and hydraulic systems.
Frequently Asked Questions
What is the difference between seamless pipes and welded pipes?
Seamless pipes have no welds, providing higher overall strength for high-pressure scenarios like boilers. Welded pipes are generally more cost-effective for low-pressure applications.
How do I choose the right material for my project?
For general use, Q235 or 20# carbon steel is recommended. For corrosive environments, choose 304/316L stainless steel or galvanized pipes. High-temperature needs require alloy pipes like 15CrMo.
Can the size of the seamless pipe be customized?
Yes, while regular specifications are readily available, custom lengths and special calibers can be produced, typically requiring a minimum order quantity and longer lead time.
How is the quality of seamless pipes detected?
Quality is ensured through visual inspection for surface defects, non-destructive testing (Ultrasonic/Eddy Current), and high-pressure water tests to ensure no leakage.
How do you prevent rust during transportation?
Pipes are typically oiled and wrapped in waterproof plastic. For long-term storage, they should be kept in a dry warehouse and elevated from the ground.
What are the common implementation standards?
Common standards include ASTM A106 (high temp), ASTM A53 (general pressure), and GB/T 8163 (fluid transportation), ensuring international compliance.

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