A Guide to Choosing the Best Carbon Steel Seamless Pipe

If you want a reliable and cost-efficient way to complete your project, carbon steel seamless pipe could be the answer. Carbon steel pipes are among the most common industrial piping materials available because of their numerous advantages, including exceptional strength and durability, making them an ideal choice for almost any construction job or home improvement project. But when it comes down to selecting which type of carbon steel seamless pipe is right for your needs, knowing what’s available and determining which varieties offer the best performance can seem daunting! That’s why we’ve compiled this guide. In it, you’ll find an overview of different types of carbon steel pipes on the market today and helpful tips on selecting one that will meet your unique requirements – so that you can ensure you get exactly what you need without spending more than necessary!

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What is Carbon Steel Seamless Pipe?

Carbon Steel Seamless Pipe is a type of carbon steel with no seams or joints. It is lightweight, durable, and highly resistant to corrosion and temperature changes. It features excellent physical properties such as high strength and toughness even when subjected to extreme conditions. Furthermore, it does not require special maintenance or sealing, which makes it ideal for high-pressure applications in extreme environments. Carbon Steel Seamless Pipe offers efficient installation with less cost than traditional pipes while offering superior durability, pressure resistance, and overall strength.

How to Choose Best Carbon Steel Seamless Pipe

Determine Your Project Requirements

Before searching for carbon steel seamless pipes, you must determine your project requirements. This includes factors such as the pipes’ size, shape, and length, as well as the pressure and temperature they will be subjected to. Consider the environment where the pipes will be installed, and identify any specific certifications or standards the pipes must meet. Understanding your project requirements will help you narrow your choices and find the most suitable carbon steel pipe.

Understand the Different Grades of Carbon Steel

CS seamless pipes are available in various grades, each with unique properties and characteristics. The most commonly used grades include ASTM A53, ASTM A106, API 5L, and more. Each grade is designed for specific applications with strengths, hardness, and corrosion resistance. It is important to understand the different grades and their properties to choose the right carbon steel seamless pipe for your project.

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Check the Manufacturing Process

The manufacturing process of cs seamless pipes can also impact their properties and durability. Pipes can be made using various methods, such as hot rolling, cold drawing, or thermal treatment. Each method produces pipes with different properties, such as strength, toughness, and flexibility. It is important to know the manufacturing process used to make the carbon steel seamless pipes you are considering and how it might affect their performance in your project.

Consider Cost and Availabilit

Finally, you need to consider the cost and availability of the carbon steel seamless pipes you are considering. While you want to choose high-quality pipes that meet your project requirements, you also need to stay within your budget. Some carbon steel seamless pipe grades may need to be more readily available or subject to longer lead times. Consider all of these factors when making your final decision.

Conclusion:

Choosing the best carbon steel seamless pipe for your project is essential to ensure its success and longevity. By understanding your project requirements, the different grades of carbon steel, the manufacturing process, and cost and availability factors, you can make an informed decision and select the best carbon steel pipe for your specific needs. Partnering with a trusted supplier can also help you make the right choice and ensure you get the highest quality carbon seamless pipes for your project.

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LittleInch

Petroleum

Joined

Mar 27,

23,176

Location

GB

What design code?

How corrosive?
With what?
Size and wt affect availability. Above about 16 to 20" seamless gets hard to find

This is more of a material selection issue and I don't know if any pipeline code which will tell you this. B31.3 doesn't like welded pipe for some reason and applies a factor on wall thickness

There is a lot of preferential engineering here and different companies have different views.

There should be little difference but you may need to look at the impact of the seam weld on corrosion issues.

If you have sour service (H2S) then seamless is definitely preferred, which is a material selection issue under the NACE standards.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it. Upvote 0 Downvote

SmallInfo

Petroleum

Joined

Oct 30,

104

Location

PK

LittleInch,
Its H2S rich
b31.8
8" size
Client will ask why I am selecting seamless or welded.
Thanks for reply Upvote 0 Downvote

LittleInch

Petroleum

Joined

Mar 27,

23,176

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GB

You need to ask a materials engineer, but I'm pretty sure for sour service you need seamless if possible and 8" the cost is about the same.

It's all about the hardness of the weld. Also look in your sour service specification.

Design wise in 31.8 it makes no difference and they won't guide you as it is not something B31.8 does.

Remember - More details = better answers
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TiCl4

Chemical

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May 1,

646

Location

CA

A general rule for corrosive services is that seamless piping is preferred - ERW pipe tends to be attacked along the pipe-weld bondline at a higher corrosion rate than the base material. My impression (not fact!) is that mill tolerances for wall thickness are either higher for seamless pipe over ERW pipe or that they are harder to get within tolerance (more expensive). So if you need to do branch reinforcement calculations for larger diameters or higher T&P, the mill tolerance becomes important.

Piping codes don't generally tell you what pipe to use in a given application; there are generally too many factors and special cases, so they leave the application up to the user.
Upvote 0 Downvote

EdStainless

Materials

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May 20,

16,411

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Waukesha WI USA

Seamless will have much more variation in wall than welded.
Seamless also usually has a rougher ID surface.
In ERW steel pipe there can be selective HAZ corrosion attack because it isn't full body heat treated after welding.

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P.E. Metallurgy, consulting work welcomed Upvote 0 Downvote

weldstan

Materials

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Jun 24,

2,817

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US

For your application choose seamless due to answers provided above. Due to our global supply chain and the vast differences in ERW welding methods from mill to mill and quality thereof, a greater chance of failure is incurred using ERW. ERW pipe can be made with excellent properties but you really have to know the mill's capabilities. Upvote 0 Downvote

MJCronin

Mechanical

Joined

Apr 9,

5,102

Location

US

My two cents ...
[ul]
[li]No piping code or standard will tell you when to use more expensive seamless piping and when not to[/li]
[/ul]
[ul]
[li] Are you selecting schedule 80 pipe for this corrosive service ? Having a thicker wall will make the piping last longer[/li]
[/ul]

[ul]
[li]Some B31 series piping codes have a higher allowable stress for seamless piping ..Seamless pipe can withstand 10-20% more working pressure than welded ones of the same material grade and size.. On what basis was your pipe wall thickness calculated ?[/li]

[/ul]


MJCronin
Sr. Process Engineer Upvote 0 Downvote

TiCl4

Chemical

Joined

May 1,

646

Location

CA

MJCronin,

When would the MAWP of the piping become the deciding factor for a piping system's thickness at low temperature and pressure? In my mind, required thickness is often very low at low T&P, and other factors like maximum unsupported span and extra thickness for corrosion allowance tend to dominate. Typically pressure is also limited by the flanges or connectors rather than piping, is it not?

I'm not challenging you here, but rather curious as to where you've seen or heard of the extra MAWP of the seamless pipe being important in the selection of ERW vs seamless. Upvote 0 Downvote

SmallInfo

Petroleum

Joined

Oct 30,

104

Location

PK

Littleinch, TiCI4, Edstainless, Weldstan, MJCronin
Thank you so much for your valuable time and information you shared, now its clear to me.
Thanks again you all Upvote 0 Downvote

EdStainless

Materials

Joined

May 20,

16,411

Location

Waukesha WI USA

At thicker walls the seamless premium is not very much more expensive.
Many ASME codes do derate welded tube by 15% for no reason other than it was welded.
The seamless tube will always be heavier and the thinnest spot will be thinner than with welded tube.
The greater wall variation is just a fact of life.


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r

Mechanical

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AR

For 10-15 years choose the cheapest.

Regards Upvote 0 Downvote

Petroleum

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PT

Each great project company in oil industry have its own basic engineering specs based on standaed codes, I am afraid you won´t recieve the wright answer here.

REGARDS Upvote 0 Downvote

Daren Samy

Mechanical

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Oct 6,

59

Location

PK

Use seamless pipe. ERW pipe is not recommended in severe conditions. Welded point is weak points and it is at risk of failure

Daren! Upvote 0 Downvote

dik

Structural

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CA

... but informative, nonetheless.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik
Upvote 0 Downvote

Petroleum

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PT

Seamless steel pipe is better than welded pipe. Seamless steel pipe is limited in larged diameters up to 24". Upvote 0 Downvote

r

Mechanical

Joined

Jan 12,

3,057

Location

AR

@
You are wrong.
See SA-106
1.1 This specifcation covers seamless carbon steel pipe
for high-temperature service (Note 1) in NPS 1/8 to NPS 48
[DN 6 to DN ] (Note 2) inclusive, with nominal (aver
age) wall thickness as given in ASME B36.10M

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Petroleum

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Jun 25,

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r
you're right, I was speaking generally. But the use of welded pipe and seamless pipe depends on the intended service. If it is going to be used for a lethal dangerous, high pressure or corrosive service I would use seamless pipe, if it is going to be used in an enoquo service I would use the cheapest welded pipe. Upvote 0 Downvote

EdStainless

Materials

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May 20,

16,411

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Waukesha WI USA

Seamless pipe isn't better than welded, it just has different types of defects in it.
With welded you get very uniform surface finish inside and out along with very uniform wall thickness.
The type of welding will dictate the nature of weld imperfections that you should be testing for, and the HT method (local to weld or full body) will influence the final properties of the pipe.
Seamless pipe will always have very significant wall thickness variation (commonly over +/-10% in each length) and the ID surfaces can have significant variation in surface.
Tears and cracks on the ID surface are not uncommon in seamless product.
Seamless over ~24" OD is usually forged hollows made in short lengths.

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