ASTM A618 High-Strength Structural Tubing
ASTM A618 covers hot-formed welded and seamless high-strength low-alloy (HSLA) structural steel pipes. A618 steel pipes are classified into different grades, including grade Ia, lb, II, and III. Each grade has specific mechanical requirements. Its main properties include high tensile strength, enhanced corrosion resistance, etc. The pipes can be welded or seamless. They can be heat treated to enhance their properties.
Gnee is a professional steel pipe manufacturer. Our A618 structural steel tubing is available in many sizes. To ensure pipe quality, we perform hydrostatic tests, flattening tests, non-destructive electrical tests, etc. Welcome to order.
If you want to know more about the grades and sizes of steel tubes, please send your requirements to email(sale@gneesteelpipe.com) or WhatsApp.
General Parameters Of A618 High-Strength Structural Tubing
| Product | A618 High-Strength Structural Tubing |
| Type | Seamless and Welded |
| Shapes | Round, Square, Rectangular |
| Brand Name | Gnee Steel |
| Length | Single Random, Double Random & Required Length & Custom Size Available |
| Origin | China |
| Monthly Output | 20 million-30 million pieces per month |
| Standard | ASME SA618 Tubes & ASTM A618 Tubes |
| Steel Grade | Ia, Ib, II, III |
| Value Added Service | Draw & Expansion as per required Size & Length, Polish (Electro & Commercial) Annealed & Pickled Bending, Machining Etc. |
| Application Industry | Infrastructure and Transportation Projects / Marine Applications / Agricultural Structures / Power Generation |
Provide Wide Sizes
We Gnee have 1 inch pipe/2 inch pipe/4 inch pipe/5 inch pipe/14 inch pipe and more for you to choose.
Many Available Steel Pipe Shapes
Square Shape Round Shape Rectangular Shape Oval Shape
More information About A618 Structural Steel Pipe
| ASTM A618 Chemical Requirements | ||||||||
| Composition, % | Grade Ia | Grade Ib | Grade II | Grade III | ||||
| Heat | Product | Heat | Product | Heat | Product | Heat | Product | |
| Carbon, max | 0.15 | 0.18 | 0.20 | . . . | 0.22 | 0.26 | 0.23A | 0.27A |
| Manganese | 1.00 max | 1.04 max | 1.35 max | 1.40 max | 0.85–1.25 | 1.30 max | 1.35 maxA | 1.40 maxA |
| Phosphorus, max | 0.15 | 0.16 | 0.025 | 0.035 | 0.025 | 0.035 | 0.025 | 0.035 |
| Sulfur, max | 0.025 | 0.045 | 0.025 | 0.035 | 0.025 | 0.035 | 0.025 | 0.035 |
| Silicon, max | . . . | . . . | . . . | . . . | 0.30 | 0.33 | 0.30 | 0.35 |
| Copper, min | 0.20 | 0.18 | 0.20B | 0.18B | 0.20 | 0.18 | . . . | . . . |
| Vanadium, min | . . . | . . . | . . . | . . . | 0.02 | 0.01 | 0.02C | 0.01 |
| A For each reduction of 0.01 % C below the specified carbon maximum, an increase of 0.05 % manganese above the specified maximum will be permitted up to 1.45 % for the heat analysis and up to 1.50 % for the product analysis. B If chromium and silicon contents are each 0.50 % min, then the copper minimums do not apply. C For Grade III, columbium may be used in conformance with the following limits: 0.005 %, min (heat) and 0.004 %, min (product). | ||||||||
| ASTM A618 Tensile Requirements | ||||||
| Grades la, lb, and ll | Grade lll | |||||
| Walls 3⁄4 in. [19.0 mm] and Under | Walls over 3⁄4 to 11⁄2 in. [19.0 to 38.0mm], incl | |||||
| Tensile strength, min, ksi [MPa]A Yield strength, min, ksi [MPa]A Elongation in 2 in. or 50 mm, min, % Elongation in 8 in. or 200 mm, min, % | 70 50 22 19 | [485] [345] | 67 46 22 18 | [460] [315] | 65 50 20 18 | [450] [345] |
| A For Grade II, when the material is normalized, the minimum yield strength and minimum tensile strength required shall be reduced by 5 ksi [35 MPa] | ||||||
Features & Advantages of ASTM A618 High-Strength Low-Alloy Structural Tubing
Gnee has been providing high-quality steel pipes with a variety of excellent properties to customers around the world for 15 years.
Versatile Dimensional Options
Available in various sizes and wall thicknesses, ASTM A618 tubing provides engineers with design flexibility to meet specific requirements. This versatility allows the tubing to be tailored to fit diverse applications.
Corrosion Resistance
The alloy composition of ASTM A618 offers natural corrosion resistance, even in challenging environments. This resistance to environmental degradation extends the tubing’s lifespan, reducing the need for regular protective coatings.
Exceptional Structural Strength
ASTM A618 tubing is formulated with an optimized alloy composition, providing enhanced tensile and yield strengths. This structural capability allows it to support heavy loads, making it indispensable for large-scale construction.
Enhanced Weldability
ASTM A618 is engineered for ease of welding, which simplifies assembly and ensures secure, high-quality weld joints. This property is crucial in construction applications where reliability in joining is essential for structural integrity.
Favorable A618 Hot-Formed Welded and Seamless Tube Prices
We can provide competitive factory prices to global customers.
Volume Discount
We provide gradually decreasing unit prices based on the quantity of steel pipes. For example, when the purchase volume reaches 100 tons, 200 tons, and 500 tons, Gnee Steel Pipe will give different discounts.
Custom Pricing
According to the specific needs (such as steel pipe material, specifications, quantity, delivery time, etc.), we can provide flexible customized quotations to meet the budgets and requirements of different customers.
Project-Based Pricing
Gnee can provide special preferential contract prices for large projects. In the process, we can also formulate flexible price plans based on the payment schedule or delivery time of the project.
What Can Gnee Guarantee For Our Customers?
Quality Assurance
As a supplier with 15 years of experience, we promise to provide high quality steel pipes, which comply with international standards and industry specifications, such as ISO, ASTM, EN, or JIS, etc. Gnee can provide relevant quality certifications, test reports & material certifications.
Faster Delivery Time
Gnee has a large inventory of steel pipes and multiple production lines. We respond to customers’ orders on time and provide customers with reasonable transportation and delivery solutions. We promise to deliver steel pipes according to the time specified in the contract.
Comprehensive Services
Gnee provides comprehensive services for customers. Services include steel pipe customization, technical support & consultation, sample provision, etc. Through the guidance of a professional team, customers can ultimately purchase steel pipe specifications, sizes, and materials that meet project requirements.
Competitive Price
As a supplier, Gnee can promise to provide competitive prices and conduct reasonable negotiations with customers. Gnee has its own factory and production lines. Also, we have established stable cooperative relationships with many reliable raw material suppliers and can provide high-quality steel pipes to the world at factory prices.
Inventory And Delivery Of Steel Pipe
Gnee factory has a large inventory of steel pipes and supports bulk orders. We also offer a variety of logistics solutions. Come and contact us.
Why Choose Gnee As A Steel Pipe Distributor?
In addition, our tubes have been successfully exported to more than 60 countries such as Vietnam, Malaysia, Indonesia, Pakistan, UAE, and South Korea, etc. Many regular customers visit our company and factory and make multiple orders.
What Services Does Gnee Provide?
Gnee can provide the following measurement services for pipe:
1. Dimensional measurement: Measure the dimensional parameters such as length, width, and thickness by measuring instruments to ensure the pipe is qualified and meets the design requirements.
2. Surface measurement: Measure parameters such as flatness, unevenness, and surface roughness of pipe surface to help ensure that the quality and surface state of the pipe meet the requirements.
3. Thickness measurement: Use a thickness measuring instrument to accurately measure the thickness of the pipe to ensure that it meets the design requirements.
4. Material measurement: Use material analysis instruments to measure the chemical composition and mechanical properties of the product to ensure that the quality and performance meet the requirements.
5. Bending and Deformation Measurements: The degree of bending and deformation of the steel pipe is measured and monitored by using tools such as bending measuring instruments and displacement sensors to ensure that it is within the allowable range.
Gnee can customize the size and shape of steel pipes for your project according to specific project needs. The custom design of the pipe is carried out by a professional engineer and design team. Based on the requirements and constraints of the project, they will use calculation and simulation tools, combined with experience and technical knowledge, to optimize the steel pipe design to meet the specific needs of your engineering.
● According to the strength requirements of structural design, adjust the thickness, width, and length of pipes.
● The shape of the steel pipe can be designed according to the characteristics of the project.
● If you consider the convenience of installation and maintenance, we can also add openings and passages for easy access and operation in the design for areas that require frequent maintenance.
Purchasing Gnee steel pipe can provide the following deep processing services. We can customize according to the specific needs of customers to meet the requirements.
Cutting service: Pipe can be custom cut to obtain the desired shape and size according to the needs of customers. For example, flame cutting, plasma cutting, laser cutting, etc., can cut steel pipes into required blocks, special-shaped parts.
Bending and forming: Pipes are bent and formed by stress application and appropriate processes to obtain the desired shape.
Welding service: Pipe can be subjected to various types of welding services, including manual arc welding, gas-shielded welding, laser welding, etc.
Turning and machining of holes: Turning and machining of holes in pipes by using machining equipment. These processes produce smooth surfaces, precise holes and threads to meet specific assembly requirements.
Surface treatment: In order to improve the corrosion resistance and aesthetics of the steel pipe, surface treatment can be carried out. This includes methods such as spraying, hot-dip galvanizing, electroplating, etc. to add a protective layer and provide corrosion resistance.
Gnee can provide the following testing services through third-party testing agencies. These third-party testing services can provide independent, objective verification that pipes comply with relevant standards and regulations.
Material chemical composition analysis: Through chemical composition analysis, determine whether the composition of the steel pipe meets the standard requirements.
Mechanical performance test: Mechanical performance test includes tensile test, impact test, bending test, etc., which are used to determine whether the mechanical properties such as strength, toughness and ductility of products meet the specified requirements.
Metallographic testing: Through metallographic testing, check the structure, grain size, non-metallic inclusions, etc. of pipes to evaluate their quality and performance.
Corrosion performance test: Through the corrosion performance test, evaluate the corrosion resistance of pipes, including salt spray corrosion resistance, chemical corrosion resistance, etc.
Hardness test: Hardness test is used to measure the hardness of pipe, and its strength and wear resistance can be evaluated according to the hardness value.
Ultrasonic flaw detection: Ultrasonic flaw detection is used to detect internal defects of pipes, such as cracks, pores, inclusions, etc.
