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About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
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Service Capability
Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.
Product Description
ASTM A252 SSAW PILE PIPE is a kind of spiral welded steel pipe pile that is widely used in foundation projects such as Bridges, ports and high-rise buildings.
| Project | Detailed description |
| Full name of the product | ASTM A252 SSAW Steel Pipe Pile |
| Standard Specification | ASTM A252 (American Society for Testing and Materials Standard) |
| Manufacturing and Technology | SSAW (Spiral Submerged Arc Welding, Spiral Submerged Arc Welding).The pipe ends can be provided as Plain End or bevel End (Beveled End, usually 30°±5°) for on-site welding. |
| Main uses | It is used as a permanent load-bearing component or as the shell for forming cast-in-place concrete piles, and is widely applied in foundation projects such as buildings, Bridges, docks, and offshore platforms |
| Common steel grades | Grade 1, Grade 2, Grade 3 (increasing intensity in sequence) |
| Mechanical properties | Minimum yield strength: Grade 1: 205 MPa, Grade 2: 240 MPa, Grade 3: 310 MPa Minimum tensile strength: Grade 1: 345 MPa, Grade 2: 414 MPa, Grade 3: 455 MPa Elongation: Varies with Grade and wall thickness. For example, for Grade 3, when the thickness is ≥7.9mm, the minimum elongation is 20% (2-inch gauge length). |
| Chemical composition | The phosphorus (P) content shall not exceed 0.050% to control the cold brittleness of the material and ensure the welding performance. Steel should be smelted by open hearth furnace, alkaline oxygen converter or electric furnace process |
| Outer diameter range | Approximately 219mm to 3048mm or even larger (wide coverage) |
| Wall thickness range | Approximately 5mm to 30mm |
| Length | It is usually 6 meters or 12 meters and can be customized according to requirements |
| Dimensions and Tolerances | - Outer diameter tolerance: Not exceeding ±1% of the specified diameter. - Wall thickness tolerance: The wall thickness at any point shall not exceed 12.5% thinner than the nominal wall thickness. - Weight tolerance: The weight of a single pipe pile is allowed to rise by no more than 15% and fall by no more than 5% |
💎Products Description
ASTM A252 standard mainly classifies grades based on mechanical properties (such as minimum yield strength and tensile strength), and has basic restrictions on chemical composition.
Mechanical property classification:
The standard mainly includes three grades: GRADE 1, GRADE 2, and GRADE 3, among which Grade 3 is the most widely used high-strength grade.
Chemical composition requirements:
The standard has clear regulations on chemical composition. For instance, it requires that the phosphorus content does not exceed 0.050% to ensure the weldability and toughness of the steel.
🏗️ Key points of engineering application and selection
This type of pipe pile mainly has two forms in application: one is as a permanent steel load-bearing component; The second is to pour concrete inside the shell to form composite piles.
When making a choice, the following points need to be given special attention:
Steel grade selection:
Choose the appropriate steel grade based on the load-bearing requirements of the engineering design. Grade 3 is the most commonly used high-intensity grade.
Dimensions and tolerances:
The outer diameter tolerance is generally ±1%, and the wall thickness shall not be more than 12.5% thinner than the nominal value.
Anti-corrosion coatings:
Depending on the soil environment and other usage conditions, different anti-corrosion coatings can be selected, such as epoxy resin (FBE), three-layer polyethylene (3PE), asphalt, etc.
Pipe end treatment:
It can be provided in the form of flat ends or bevels (for on-site welding convenience) according to construction requirements.
💎 Summary
ASTM A252 SSAW PILE PIPE is a kind of deep foundation engineering material with mature technology, diverse specifications and strong load-bearing capacity. Understanding its standards, processes, performance and application characteristics is helpful for making reasonable choices in engineering projects.
Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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