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What is seamless steel pipe?

Seamless steel pipe is a steel pipe made of whole round steel pierced without welded seams on the surface, called seamless steel pipe. According to the production method, seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, top pipe, etc.

According to the shape of the section, seamless steel pipe is divided into two kinds of round and shaped, shaped pipe has a square, oval, triangular, hexagonal, melon, star, with a variety of complex shapes finned tube. The maximum diameter is 900mm and the minimum diameter is 4mm.

Depending on the use, there are thick-walled seamless steel tubes and thin-walled seamless steel tubes. Seamless steel tubes are mainly used as petroleum geological drilling tubes, petrochemical cracking tubes, boiler tubes, bearing tubes, and high-precision structural steel tubes for automobiles, tractors, and aviation.

Seamless steel pipe applications

1, general purpose seamless steel pipe is rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, the most production, mainly used as a pipeline or structural parts for the transport of fluids.

2、Supplied in three categories according to different uses.

a、Supplied by chemical composition and mechanical properties.

b、Supplied according to mechanical properties.

c、Supplied according to hydraulic test. Steel pipes supplied according to category a and b are also subjected to hydrotesting if they are used to withstand liquid pressure.

3, special purpose seamless tubes are available in a variety of seamless tubes for boilers, chemical power, seamless steel tubes for geological use and seamless tubes for petroleum.

Seamless steel pipe has a hollow cross-section and is used in large quantities as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight when the bending and torsional strength is the same, and is an economic cross-sectional steel.

Widely used in the manufacture of structural and mechanical parts, such as oil drilling rods, automobile transmission shafts, bicycle frames and steel scaffolding used in construction, etc. The use of steel pipe manufacturing ring parts, can improve material utilization, simplify the manufacturing process, save materials and processing time, has been widely used to manufacture steel pipe.


Schedule 40 steel pipe is the most commonly used pipe schedule. It can be galvanized — although it doesn’t have to be — and is usually used in water and gas lines. It may also appear in places that need ornamentation or support.

It makes a great pipe due to its versatility and performance strength.

schedule 40 steel pipe

The parameters for each schedule are determined by the ASME B36.10M, which is the standard governing seamless and welded steel pipe dimensions. ASME B36.10M determines the numbers that designate each size.

Chemical Composition of Schedule 40 Steel Pipe


Schedule 40 pipe refers to the nominal wall thickness, not the grade. Therefore, the chemical composition of a pipe schedule is not necessarily uniform.

Carbon – 0.25% (max)

Manganese – 0.95% (max)

Phosphorous – 0.05% (max)

Sulfur – 0.045% (max)

Copper – 0.4% (max)

Nickel – 0.4% (max)

Chromium – 0.4% (max)

Molybdenum – 0.15% (max)

Vanadium – 0.08% (max)

Applications of Sch 40 Steel Pipe

Most hardware stores sell schedule 40 steel pipes. Many DIYers enjoy using this product in creative projects. Schedule 40 steel pipe makes sturdy and attractive curtain rods, shelves, coat hooks, floor lamps, and magazine racks.

Details of sch40 seamless steel pipe

Grades of Schedule 40 Steel Pipe

Most schedule 40 steel pipe is made from mild steel. This means it has a carbon content of about 0.2% to 0.25%. That’s very, very low, making the alloy mostly ferrous in composition.

To improve SCH 40 steel pipe’s corrosion resistance, steel manufacturers usually galvanize the steel, which means to plate it with a layer of zinc. If this option is not appropriate, schedule 40 pipe does come in stainless steel.

A53 steel pipe is the grade most commonly associated with SCH 40 steel pipe, but you can also find this schedule in other grades.

Schedule 40 Steel Pipe Dimensions

Thicknesses are measured by both wall thickness and outside diameter. As an example, a 1/8th-inch nominal size schedule 40 pipe has an outside diameter of 0.405 and a wall thickness of 0.068. Its weight per foot stands at 0.245.

A more common pipe is the 4-inch schedule 40 steel pipe. This pipe’s outside diameter is 4.5 with a wall thickness of 0.237 and a weight per foot of 10.79.

What size is schedule 40 steel pipe?

This steel pipe product comes in a variety of dimensions. The size of the pipe, its nominal diameter, actual inside diameter, and actual outside diameter all fit within the right parameters.

For example, a schedule 40 pipe that’s 2.5 inches in diameter will be 2.469 in actual inside diameter and 2.875 in actual outside diameter.

The Weight of Schedule 40 Steel Pipe


As a general rule, the weight per foot stands around 1.68 lbs.

How much weight can schedule 40 steel pipe hold?


How much weight it can hold depends on a variety of factors. If you buy a standard pipe — A53-grade, black steel — it will demonstrate 30,000 psi yield strength.

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