Seamless Steel Pipe

Seamless pipe, as the name suggests, is a pipe without a seam or a weld-joint. Seamless Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow pipe.

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This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their micro-structure. Tensile tests, impact tests, hydro-static tests, and nondestructive electric tests shall be made in accordance to specified requirements.
1. Scope
1.1 This specification covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. Several grades of ferric steel are included as listed in Table 1. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
1.2 Supplementary Requirement S1 of an optional nature is provided. This shall apply only when specified by the purchaser.
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in non-conformance with the specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.

Technical data

Seamless Steel Pipe Chemical Composition and Mechanical Properties

This data is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

StandardGradeChemical Composition (%)Mechanical Properties
ASTM A53CSiMnPSTensile STrength(Mpa)Yield STrength(Mpa)
A≤0.25-≤0.95≤0.05≤0.06≥330≥205
B≤0.30-≤1.2≤0.05≤0.06≥415≥240
ASTM A106A≤0.30≥0.100.29-1.06≤0.035≤0.035≥415≥240
B≤0.35≥0.100.29-1.06≤0.035≤0.035≥485≥275
ASTM A179A1790.06-0.18-0.27-0.63≤0.035≤0.035≥325≥180
ASTM A192A1920.06-0.18≤0.250.27-0.63≤0.035≤0.035≥325≥180
API 5L PSL1A0.22-0.900.0300.030≥331≥207
B0.28-1.200.0300.030≥414≥241
X420.28-1.300.0300.030≥414≥290
X460.28-1.400.0300.030≥434≥317
X520.28-1.400.0300.030≥455≥359
X560.28-1.400.0300.030≥490≥386
X600.28-1.400.0300.030≥517≥448
X650.28-1.400.0300.030≥531≥448
X700.28-1.400.0300.030≥565≥483
API 5L PSL2B0.24-1.200.0250.015≥414≥241
X420.24-1.300.0250.015≥414≥290
X460.24-1.400.0250.015≥434≥317
X520.24-1.400.0250.015≥455≥359
X560.24-1.400.0250.015≥490≥386
X600.24-1.400.0250.015≥517≥414
X650.24-1.400.0250.015≥531≥448
X700.24-1.400.0250.015≥565≥483
X800.24-1.400.0250.015≥621≥552

Carbon Steel Seamless Pipe Chemical Composition and Mechanical Properties 

StandardGradeChemical CompositionMechanical Properties
CSiMnPSCrNiCuTensile Strength(Mpa)Yield Strength(Mpa)Elongation(%)
GB/T8163100.07-0.140.17-0.370.35-0.65≤0.035≤0.035≤0.15≤0.25≤0.25335-457≥205≥24
200.17-0.240.17-0.370.35-0.65≤0.035≤0.035≤0.25≤0.25≤0.25410-550≥245≥20
Q3450.12-0.200.20-0.551.20-1.60≤0.045≤0.045---490-665≥325≥21


 Carbon Steel Seamless Pipe Tolerance 

Pipe typesPipe Szie(mm)Tolerances
Hot rolledODAll±1% (min ±0.50mm)
WTAll+15%, -12.5%
Cold drawnOD6～10±0.20mm
10～30±0.40mm
30～50±0.45mm
>50±1%
WT≤1±0.15mm
>1～3+15% -10%
>3+12.5% -10%


Seamless Steel Pipe End 

Plain EndWall Thickness less than 0.5 inch, including SCH STD & SCH XS
Plain End (Square Cut)Wall Thickness over 0.5 inch, including SCH XXS
Beveled EndWall Thickness less than 0.5 inch, including SCH STD & SCH XS 
CouplingsOutside Diameter equal or less than 2''
Thread ProtectionOutside Diameter over 4 inch

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