When it comes to choosing the right type of pipe for your project, cost is often a significant factor to consider. Two popular options in the market are ERW (Electric Resistance Welded) pipe and seamless pipe. Both have their advantages and disadvantages, but understanding the cost comparison between the two can help you make an informed decision.
Firstly, let’s delve into the manufacturing process of each type of pipe. ERW pipe is made by rolling a flat steel plate and Welding the seam with the help of an electric current. On the other hand, seamless pipe is produced by piercing a solid billet of steel and then rolling it into a seamless tube. This difference in manufacturing processes directly impacts the cost of each type of pipe.
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Chemical Composition
C
Mn
P≤
S≤
Si≤
0.06-0.18
0.27-0.63
0.035
0.035
0.25
One of the primary factors that affect the cost of ERW pipe is the cost of raw materials. Since ERW pipe is made from a flat steel plate, the cost of the plate itself plays a significant role in determining the overall cost. Additionally, the welding process involved in ERW pipe production requires electricity, which adds to the manufacturing cost. These factors contribute to ERW pipe being generally more affordable than seamless pipe.
Seamless pipe, on the other hand, requires a solid billet of steel, which is typically more expensive than a flat steel plate. The manufacturing process of seamless pipe also involves more complex machinery and equipment, leading to higher production costs. These factors make seamless pipe generally more expensive than ERW pipe.
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.
c For through-wall hardness tests of Grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number.
API 5CT L80 Casing TubingGrade Color Codes
Grade
Grade Type
Number and Color of Bands for Product a with Length³ 1.8 m
Color(s) for Couplings
Entire Coupling
Band(s) b, c
1
2
3
4
5
H40
—
None or black band at the manufacturer’s option
None
Same as for pipe
J55 Tubing
—
One bright green
Bright green
None
J55 Casing
—
One bright green
Bright green
One white
K55
—
Two bright green
Bright green
None
N80
1
One red
Red
None
N80
Q
One red, one bright green
Red
Green
R95
—
One brown
Brown
None
L80
1
One red, one brown
Red
One brown
L80
9Cr
One red, one brown, two yellow
None
Two yellow
L80
13Cr
One red, one brown, one yellow
None
One yellow
C90
1
One purple
Purple
None
T95
1
One silver
Silver
None
C110
—
One white, two brown
White
Two brown
P110
—
One white
White
None
Q125
1
One orange
Orange
None
a In the case of coupling Material, unless otherwise specified in the purchase agreement, the manufacturer’s internal requirements shall govern.
b Special clearance couplings shall also have a black band.
c Seal-ring couplings shall also have a blue band.
Another aspect to consider when comparing the cost of ERW pipe and seamless pipe is the availability of sizes and specifications. ERW pipe is available in a wide range of sizes and specifications, making it easier to find the right fit for your project. This availability helps keep the cost of ERW pipe competitive. On the other hand, seamless pipe is often limited in terms of sizes and specifications, which can drive up the cost due to the higher demand for specific sizes.
Furthermore, the transportation cost of each type of pipe should also be taken into account. ERW pipe, being made from a flat steel plate, can be easily rolled and transported in large quantities. This ease of transportation helps keep the cost down. In contrast, seamless pipe, being a solid billet, requires more careful handling and transportation, which can increase the overall cost.
It is important to note that while ERW pipe may be more cost-effective in terms of initial purchase, there are other factors to consider in the long run. Seamless
It is important to note that while ERW pipe may be more cost-effective in terms of initial purchase, there are other factors to consider in the long run. Seamless
