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Seamless Steel Pipe

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.
Product introduction
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.

Standard Grade Chemical Composition (%) Mechanical Properties
ASTM A53 C Si Mn P S Tensile 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 A106 A ≤0.30 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 ≥415 ≥240
B ≤0.35 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 ≥485 ≥275
ASTM A179 A179 0.06-0.18 - 0.27-0.63 ≤0.035 ≤0.035 ≥325 ≥180
ASTM A192 A192 0.06-0.18 ≤0.25 0.27-0.63 ≤0.035 ≤0.035 ≥325 ≥180
API 5L PSL1 A 0.22 - 0.90 0.030 0.030 ≥331 ≥207
B 0.28 - 1.20 0.030 0.030 ≥414 ≥241
X42 0.28 - 1.30 0.030 0.030 ≥414 ≥290
X46 0.28 - 1.40 0.030 0.030 ≥434 ≥317
X52 0.28 - 1.40 0.030 0.030 ≥455 ≥359
X56 0.28 - 1.40 0.030 0.030 ≥490 ≥386
X60 0.28 - 1.40 0.030 0.030 ≥517 ≥448
X65 0.28 - 1.40 0.030 0.030 ≥531 ≥448
X70 0.28 - 1.40 0.030 0.030 ≥565 ≥483
API 5L PSL2 B 0.24 - 1.20 0.025 0.015 ≥414 ≥241
X42 0.24 - 1.30 0.025 0.015 ≥414 ≥290
X46 0.24 - 1.40 0.025 0.015 ≥434 ≥317
X52 0.24 - 1.40 0.025 0.015 ≥455 ≥359
X56 0.24 - 1.40 0.025 0.015 ≥490 ≥386
X60 0.24 - 1.40 0.025 0.015 ≥517 ≥414
X65 0.24 - 1.40 0.025 0.015 ≥531 ≥448
X70 0.24 - 1.40 0.025 0.015 ≥565 ≥483
X80 0.24 - 1.40 0.025 0.015 ≥621 ≥552

Carbon Steel Seamless Pipe Chemical Composition and Mechanical Properties 

Standard Grade Chemical Composition Mechanical Properties
C Si Mn P S Cr Ni Cu Tensile Strength(Mpa) Yield Strength(Mpa) Elongation(%)
GB/T8163 10 0.07-0.14 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035 ≤0.15 ≤0.25 ≤0.25 335-457 ≥205 ≥24
20 0.17-0.24 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035 ≤0.25 ≤0.25 ≤0.25 410-550 ≥245 ≥20
Q345 0.12-0.20 0.20-0.55 1.20-1.60 ≤0.045 ≤0.045 - - - 490-665 ≥325 ≥21

 Carbon Steel Seamless Pipe Tolerance 
Pipe types Pipe Szie(mm) Tolerances
Hot rolled OD All ±1% (min ±0.50mm)
WT All +15%, -12.5%
Cold drawn OD 6~10 ±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 End Wall 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 End Wall Thickness less than 0.5 inch, including SCH STD & SCH XS 
Couplings Outside Diameter equal or less than 2''
Thread Protection Outside Diameter over 4 inch
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