Seamless steel pipe Ø406 standard ASTM A106/API 5L

Ø 406 (DN400) seamless steel pipe, according to the ASTM A106 standard, is a seamless pipe with an outer diameter of 406.4mm and a nominal diameter of DN400. And the wall thickness is consistent with schedule types. For example, Schedule 40 or Schedule 80, depending on the specific application,.

ASTM A106 standard Ø406 seamless steel pipe is a carbon steel material widely used in oil, gas, and other industrial applications. This is one of the most important standards for seamless steel pipes, ensuring the quality and durability of the product.

DN400 seamless steel pipe meets ASTM A106 standards and can withstand high pressure and temperature. This is due to the composition and content of the chemical elements that make it up.

Technical specifications of seamless steel pipe Ø 406 standard ASTM A106/API 5L

Chemical composition table of steel grades for manufacturing DN400 seamless t steel pipes

Manufactured according to ASTM A106 standards, Øi 406 seamless steel pipes have the following mechanical and chemical properties:

Mechanical properties of A106 Ø406 seamless pipes

  • Yield strength: minimum 240 MPa
  • Tensile strength: minimum 415 MPa
  • Elongation: minimum 22%
  • Yield elongation: minimum 14.2%
  • Modulus of elasticity: 207 GPa (30 x 10^6 psi)
Tính chất cơ học của ống thép đúc phi 406
Mechanical properties of Ø 406 seamless steel pipes

Chemical properties of A106 DN400 seamless steel pipes

  • Carbon (C): 0.25% max
  • Manganese (Mn): from 0.27% to 0.93%
  • Phosphorus (P): 0.035% max
  • Sulfur (S): 0.035% max
  • Silicon (Si): maximum 0.10%
  • Chrome (Cr): 0.40% max
Tính chất cơ học
Mechanical properties

These mechanical and chemical properties help define and ensure the quality of the product. They also determine the product’s strength and heat resistance.

It helps it be used in demanding applications such as oil, gas, chemical, thermal power, and other industrial applications.

DN400 seamless steel pipe specification table

DN400 seamless steel pipe corresponds to a pipe with an outer diameter of 406.4mm. This is one of the most popular sizes of seamless steel pipes.

At Bao Tin Steel Company Limited, we provide Ø 406 seamless steel pipes with the following specifications:

  • Nominal size: NPS16
  • Nominal diameter: DN400
  • Outer diameter (OD): 406.4 mm
  • Wall thickness (WT): from 6.35 mm to 30.96 mm. There are usually non-406 seamless steel pipes SCH10, SCH20, SCH30, STD, SCH40, SCH60, SCH80, XS.
  • Standard lengths of 6m or 12m can be cut according to customer requirements.
thép ống đúc phi 406
Seamless steel pipe Ø 406

For readers to understand better, Bao Tin Steel has created a table below for your convenience.

(inches) (mm) (mm) (mm) (mm)
16 400 406 4,19 398,02
4,78 396,85
10 6,35 393,70
20 7,92 390,55
30 9,53 387,35
40 12,70 381,00
60 16,66 373,08
80 21,44 363,52
100 26,19 354,03
120 30,96 344,47
140 36,53 333,35
160 40,49 325,42
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Advantages of Ø 406 seamless pipes

  • High durability and hardness. Ø 406 cast pipes are made from steel with high strength and hardness, helping to increase the pipe’s ability to withstand force and pressure during use.
  • Good strength and pressure resistance. Due to their large diameter and relative thickness, DN400 seamless steel pipes have good strength and pressure resistance, especially in industrial and construction applications.
  • Good corrosion resistance and wear resistance. DN400 seamless pipe has better corrosion resistance than other types of pipe, helping to increase the life and durability of the pipe during use.
  • Easy to process and install. With a large inner diameter and relative thickness, Ø 406 seamless steel pipes are easy to process and install, helping to save time and costs during construction.
  • High applicability. Ø 106 seamless pipes are widely used in many different fields, including the oil and gas industry, construction, mechanical engineering, and pipe equipment manufacturing.

Applications of Ø 406 seamless steel pipe according to ASTM A106/API 5L standards

As mentioned above, Ø 406 seamless steel pipe is a large-diameter pipe. Strength and heat resistance are also good. So this product has many applications in different industries, including:

  • Oil and Gas Conveyance: This product is used to transport oil and gas to different areas both domestically and internationally.
  • Chemicals: ASTM A106/API 5L standard DN400 steel pipe is used to transport chemicals from manufacturing plants to distributors or other points of use.
  • Thermal power: This product is used to transport water and steam in thermal power plants.
  • Construction: This product is used to construct bridges, pipelines, and other structures.
  • Shipbuilding: ASTM A106/API 5L standard DN400 steel pipe is also used in shipbuilding applications. Mainly used for the construction of tanks, pipes, and other components in ships.
Ứng dụng của ống đúc DN400
Application of DN400 seamless pipe

Ø 406 seamless steel pipe standard ASTM A106/API 5L has many applications in different industries. However, readers also need to consider the actual needs of the project. To make the most suitable choice, help save costs and ensure safety.

Production process of Ø 406 seamless steel pipe according to ASTM A106/API 5L standards

Normally, to produce large-diameter seamless steel pipes such as Ø 406, manufacturers will use a rolling mill or mill with a mandrel.

The specialized name for this method is Plug Rolling Mill, also known as the Mannesmann mandrel milling method. Invented by Mannesmann, a German engineer.

Mandrel rolling machine method

This method is used to produce pipes of medium diameter.

On the mill, the heated steel billet is passed through its center.

The punched workpiece then moves to a mandrel mill or pin end mill. There, the billet is rolled using a pin or mandrel bar inserted inside.

After the pin or mandrel is withdrawn, the rolling shell is reheated before processing on a sizing mill or expansion mill to achieve the desired wall thickness and outside diameter.

The seamless steel pipe is then passed through a cutting machine to be cut into the required lengths.

Then it will continue to be painted or galvanized to protect the surface. And finally, print product information, including the manufacturer name, tube specifications, and batch code.

To make it easier to imagine. Please read through the images below.

Quy trình sản xuất ống thép đúc bằng máy cán trục gá
Process of producing cast steel pipes using a mandrel rolling machine

Bao Tin Steel has a detailed article on the cast and welded pipe production process, inviting readers to take a look. Hopefully, through this article, readers and customers can grasp information about the standards and applications of molded pipes.

Tiger Steel is a branch of Bao Tin Steel.

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