The Cost Comparison between Seamless Pipe and Welded Pipe

Seamless pipe and welded pipe are two common types of pipes used in various industries. While both serve the same purpose of transporting fluids or gases, there are significant differences between the two in terms of cost. In this article, we will explore the cost comparison between seamless pipe and welded pipe, shedding light on the factors that influence their prices. casing pipe,casing well pipe, casing supreme pipe, casing vs carrier pipe, casing for ac pipe, casing steel pipe, casing pipe size, casing pvc pipe price, casing pipe, casing pipe suppliers in China, casing capping pipe, casing drill pipe,carrier pipe,casing pipe size,bushing Flange,bushing sleeve,bushing,bushing arm,bushing bearing,bushing Reducer,bushing tool,bushing pvc,bushing meaningFirstly, let’s understand what seamless pipe and welded pipe are. Seamless pipe, as the name suggests, is manufactured without any Welding or joints. It is made by piercing a solid cylindrical billet and then rolling it into a seamless tube. On the other hand, welded pipe is created by welding two or more pieces of steel together to form a continuous pipe. The welding process can be done using various techniques such as electric resistance welding (ERW), submerged arc welding (SAW), or high-frequency induction welding (HFIW). alt-162 alt-163 When it comes to cost, seamless pipe tends to be more expensive than welded pipe. This price difference can be attributed to several factors. Firstly, the manufacturing process of seamless pipe is more complex and time-consuming compared to welded pipe. Seamless pipe requires specialized equipment and skilled labor to produce, which adds to its production cost. In contrast, welded pipe can be manufactured using simpler machinery and techniques, making it more cost-effective.
Another factor that affects the cost of seamless pipe is the raw Material used. Seamless pipe is typically made from high-quality steel, which is more expensive than the steel used for welded pipe. The higher cost of raw materials contributes to the overall price of seamless pipe. On the other hand, welded pipe can be made from a wider range of steel grades, including lower-cost options, making it a more economical choice.
OD In (mm)+–WT In (mm)+–
<1(25.4)0.100.10≤1.1/2(38.1)20%0
1∼1.1/2(25.4∼38.1)0.150.15>1.1/2(38.1)22%0
>1.1/2∼<2(38.1∼50.8)0.200.20   
2∼<2.1/2(50.8∼63.5)0.250.25   
2.1/2∼<3(63.5∼76.2)0.300.30   
3∼4(76.2∼101.6)0.380.38   
>4∼7.1/2(101.6∼190.5)0.380.64   
>7.1/2∼9(190.5∼228.6)0.381.14   
Tensile and Hardness Requirements
Grade  Yield strength MPaTensile StrengthHardness a,cSpecified Wall thicknessAllowable Hardness Variation b
 TypeTotal Elongation Under Load min MPamax  
   minmax HRCHBWmmHRC
12345678910
H40—0.5276552414————
J55—0.5379552517————
K55—0.5379552655————
N8010.5552758689————
N80Q0.5552758689————
R95—0.5655758724————
L80 L8010.555265565523241——
L809Cr 13Cr0.555265565523241——
  0.555265565523241——
C9010.562172468925.4255£12.703
        12.71 to 19.044
        19.05 to 25.395
        ³ 25.406
T9510.565575872425.4255£12.703
        12.71 to 19.044
        19.05 to 25.395
        ³ 25.406
C110—0.775882879330286£12.703
        12.71 to 19.044
        19.05 to 25.395
        ³ 25.406
P110—0.6758965862————
Q12510.658621034931b—£12.703
        12.71 to 19.04 19.054
         5
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.
Furthermore, the production volume also plays a role in determining the cost of these pipes. Seamless pipe production is generally limited due to the complexity of the manufacturing process. This limited production capacity leads to higher prices as demand often exceeds supply. In contrast, welded pipe can be produced in larger quantities, allowing for economies of scale and lower production costs.
It is worth noting that while seamless pipe may have a higher upfront cost, it can offer long-term cost savings in certain applications. Seamless pipe is known for its superior strength and reliability, making it suitable for high-pressure and high-temperature environments. Its seamless construction eliminates the risk of leaks or failures, reducing maintenance and repair costs over time. Welded pipe, although more affordable initially, may require more frequent inspections and repairs, which can add to
Chemical Composition, Mass Fraction (%)
Grade CMnMoCrNiCuPSSi
 Typeminmaxminmaxminmaxminmaxmaxmaxmaxmaxmax
123456789101112131415
H40————————————0.03—
J55————————————0.03—
K55————————————0.03—
N801——————————0.030.03—
N80Q——————————0.030.03—
R95——0.45 c—1.9——————0.030.030.45
L801—0.43 a—1.9————0.250.350.030.030.45
L809Cr—0.150.30.60.91.18100.50.250.020.031
L8013Cr0.150.220.251——12140.50.250.020.031
C901—0.35—1.20.25 b0.85—1.50.99—0.020.03—
T951—0.35—1.20.25 b0.850.41.50.99—0.020.03—
C110——0.35—1.20.2510.41.50.99—0.020.03—
P110e——————————0.030 e0.030 e—
Q1251—0.35 1.35—0.85—1.50.99—0.020.01—
NOTE Elements shown shall be reported in product analysis.
a The carbon content for L80 may be increased up to 0.50 % maximum if the product is Oil-quenched or polymer-quenched.
b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness is less than 17.78 mm.
c The carbon content for R95 may be increased up to 0.55 % maximum if the product is oil-quenched.
d The molybdenum content for T95 Type 1 may be decreased to 0.15 % minimum if the wall thickness is less than 17.78 mm.
e For EW Grade P110, the phosphorus content shall be 0.020 % maximum and the sulfur content 0.010 % maximum.

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