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Casing Pipe (Seamless Steel Tube and Pipe for Oil and Gas Extraction)

Carbon steel made seamless casing pipe is used for extraction of petroleum and natural gas from oil wells.

Tolerance
Item Tolerance
Outer Diameter Pipe Body D≤101.6mm+-0.79mm
D≥114.3mm+1.0%D-5%D
Coupling +-1%D
Thickness 0-12.5%t
Weight Single Size +6.5%-3.5%
Batch Size 0-1.75%

Mechanical Properties

Steel Grade Yield Strength Tensile Strength Hardness Hardness Range
Min Max Min Max
Psi Mpa Psi Mpa Psi Mpa Hrc Bhn Hrc
J55 55,000 379 80,000 552 75,000 517 - - -
K55 55,000 379 80,000 552 95,000 655 - - -
N80 80,000 552 80,000 758 100,000 689 - - -

Chemical Composition

Steel Grade Chemical Composition (%)
C Si Mn P S Cr Ni Cu V Als
J55/K55 (37Mn5) 0.34-0.39 0.20- 0.35 1.25- 1.50 ≤ 0.02 ≤ 0.015 ≤ 0.15 ≤ 0.20 ≤ 0.20 ≤ 0.02
N80 (36Mn2V) 0.34- 0.38 0.25- 0.40 1.45- 1.70 ≤ 0.02 ≤ 0.015 ≤ 0.15 ≤ 0.20 ≤ 0.20 0.11- 0.16 ≤ 0.02
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