Steel casing pipes - Hebei Haihao Group

Steel casing pipes

Steel casing pipe,also known as encasement pipe,is most commonly used in underground construction to protect utility lines of various types from getting damaged.Steel casing pipe is used in different types of horizontal underground boring,where the pipe is jacked into an augered hole in segments and then connected together by welding or by threaded and coupled ends,or other proprietary pipe connectors such as the interference-fit Permalok interlocking push-on joint.Steel casing pipe protects one or many of various types of utilities such as water mains,gas pipes,electrical power cables,fiber optic cables,etc.

API 5CT PLS1 steel casing pipes

API 5CT PLS1 steel casing pipes

Specification of steel casing pipes:

Manufacture Type: Seamless steel pipe,welding steel pipe
Parts: Casing,tubing ,coupling ,thread protector
Size Range(OD): Seamless:114.3-406.4mm
Welding:88.9-660.4mm
Length range 6-13m
Standard: API 5CT
Certification: API 5CT, GOST, ISO9001, ISO14001,OHSMS18000
Grades API 5CT J55/K55/N80/L80-1/L80-9Cr/L80-13Cr/P110/Q125/K55 D10/L80 D10.
Type of thread: STC,LTC,BTC,XC,NU,EU, XBY premium
Surface Treatment: Fusion bond epoxy coating,coal tar epoxy,3PE,varnish coating,bitumen coating,black oil coating as per customer’s requirement.
Testing: Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test,X-ray Test.
Testing Report: SGS,BV etc.3rd Party Testing Report is available .
Customized Size: Non-standard size can be customized as per customer’s request.

Dimension tolerance of steel casing pipes:

Types of steel tubes Outer Diameter Wall Thickness

Cold-rolled tubes

Tube sizes(mm) Tolerances(mm)

Tolerances(mm)

<114.3

±0.79

-12.5%

≥114.3

-0.5%,+1%

Chemical Composition of API 5CT steel casing and tubing pipes:

Chemical composition,mass fraction(%)
Group Grade Type C Mn Mo Cr Ni Cu P S Si
Min. Max. Min. Max. Min. Max. Min. Max. Max. Max. Max. Max. Max.
1 H40 0.03 0.030
J55 0.03 0.030
K55 0.03 0.030
N80 1 0.03 0.030
N80 Q 0.03 0.030
R95 0.45 1.90 0.03 0.030  0.45
2 M65 0.03 0.030
L80 1 0.43 1.90 0.25 0.35 0.03 0.030  0.45
L80 9Cr 0.15 0.30 0.60 0.90 1.10 8.00 10.00 0.50 0.25 0.02 0.010 1.00
L80 13Cr 0.15 0.22 0.25 1.00 12.00 14.00 0.50 0.25 0.02 0.010 1.00
C90 1 0.35 1.20 0.25 0.85 1.50 0.99 0.02 0.010
T95 1 0.35 1.20 0.25 0.85 0.40 1.50 0.99 0.02 0.010
C110 0.35 1.20 0.25 1.00 0.40 1.50 0.99 0.02 0.005
3 P110 0.03 0.030
4 Q125 1 0.35 1.35 0.85 1.50 0.99 0.02 0.010
  • a.The carbon content for L80 may be increased up to 0.50% maximum if the product is oil-quenched.
  • b. The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the WT is less than 17,78mm.
  • c.The carbon content for R95 may be increased up to0.55% maximum if the product is oil-quenched.
  • d.The molybdenum content for T95 Type 1 may be decreased to 0.15% minimum if the WT is less than 17,78mm.
  • e. For EW Grade P110,the phosphorus content shall be 0.020% maximum and the sulfur content 0.010% maximum
  • NL=no limit.Elements shown shall be reported in product analysis.

Mechanical Properties of API 5CT steel casing and tubing pipes:

Mechanical Properties
Group Steel Grade Type Total Yield Strength (Mpa) Tensile Strength (Mpa) Hardness max.
% min. max. MPa HRC HWB
1 H40 0.5 276 552 414
J55 0.5 379 552 517
K55 0.5 379 552 655
N80 1 0.5 552 758 689
N80 Q 0.5 552 758 689
R95 0.5 655 758 724
2 M65 0.5 448 586 586 22 235
L80 1 0.5 552 655 655 23 241
L80 9Cr 0.5 552 655 655 23 241
L80 13Cr 0.5 552 655 655 23 241
C90 1 0.5 621 724 689 25.4 255
T95 1 0.5 655 758 724 25.4 255
C110 0.7 758 828 793 30 286
3 P110 0.6 758 965 862
4 Q125 1 0.65 862 1034 931
  • 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 API 5CT.

We have a large inventory of ASTM 5CT steel casing and tubing pipes.Normal inventory includes pipe diameter sizes: 2″,3″, 4″, 6″, 8″, 10″, 12″, 14″, 16″, 18″, 20″, 22″, 24″, 30″, and 36″. Also available in larger diameters to 110″ with wall thicknesses ranging in thickness from 0.25″-1″depending upon the pipe OD.

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