Limestone Quarry Plant

One of the Top 500 enterprises in China foreign trade

QCCO was approved as a member of “China Association for Contracting Projects Abroad “and granted a membership certificate on Sep 28,2005; “Credibility Rating AAA certificate in Foreign Trade” was granted to QCCO by China Shippers’ Association

 
 

Steel casing and tube

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Steel casing and tube

 

Casing pipes are used for casing for oil and gas wells. Steel casing pipes and tubing are applied to furnishing and installing cased tunnels, where they indicate to pass other utilities or obstructions without open excavation. Steel casing pipes and tube have smooth wall and a minimum yield strength of 35,000 psi. Corrosion-proofing water-based paint is applied on the outside pipe surface to protect against atmospheric corrosion during transportation and storage. The pipes can be delivered with metal or composite caps at both ends for thread protection.Casing pipes are manufactured out of steel are smelted in the electric furnace, treated with synthetic slags and cast by continuous casters. The applied steel making process ensures the achievement of chemically pure steel with reference to sulphur and phosphor contents providing high tensile, ductility and corrosion resistance properties of pipes to be operated at low temperatures in various corrosion media. Pipes are heat-treated in a computerized walking beam furnace. Steel grades and heat treatment regimes applied allow high-strength pipe to be obtained.
 

Steel casing and tube

 

National Standard

Enterprise Standard

Comparison

Results

Welded Steel Pipe for Transportation of Low Pressure Fluid

Welded Pipe

Outside Diameter of Steel Pipe

Outside Diameter of Steel Pipe, Tolerance of Outside Diameter

Better than National Standards

Outside Diameter

D/mm

Tolerance of Pipe Outside Diameter

Tolerance of Pipe End Outside Diameter/mm

 

Outside

Diameter

D

 

 

8"

 

±0.60mm

D≤48.3

±0.5mm

 

5"-6"

±0.50mm

48.3<D≤168.3

±1.0%

 

4"

±0.40mm

168.3<D≤508

±0.75%

+2.4 -0.8

3"-2½”

±0.30mm

D>508

±1.0%

+3.0 -0.8

D≤2”

±0.20mm

Tolerance of Wall Thickness

±12.5%

Wall Thickness S

1.8-5.75mm

5%

Length

 

Usual Length

Tolerance

Length

 

 

Better than National Standards

D≤2”

+5-0

4M-12M

+20-0

2½” ≤D≤4”

+10-5

Multiple length: 5-10mm tolerance for each Multiple length

+20-0

5” ≤D

+15-0

 

+20-0

Bending

 

≤168.3mm

Straight for ordinary use or negotiate the bending

Bending

 

 

≤1.5%

Better than National Standards

>168.3mm

Smaller than 0.2% of full length of steel pipe

 

 

Pipe End

 

The two end faces of steel pipe should bu vertical with axes of the steel pipe. No burr in the incising

Pipe End

The two end faces of steel pipe should be vertical with axes of the steel pipe. No burr in the incising

Equal to International

Standards

≥168.3mm

Cutting tilt: no more than 5mm

≥168.3mm

Cutting tilt: no more than 5mm

Chemical Composition

Execute according to GB/T222, GB/T223 and GB/T4336

Chemical Composition

Execute according to GB/T222, GB/T223, GB/T699, GB/T700, GB/T1591 and GB/T4336

Better than International Standards

Mechanical Properties

Execute according to GB/T228,GB/T6397, GB/T244 and GB/T246

Mechanical Properties

Execute according to GB/T228, GB/T6397, GB/T244 and GB/T246

Equal to International Standards

 

Surface Quality Of Steel Pipe

 

Internal and external surface of pipe should bu slick. Folding crack,
delamination and lap weld are not permitted. Other defects that
no more than the negative deviance of wall thickness are permitted
. Internal burr is allowed to exist. Steel pipe with>100mm, could be repaired for its defects and carry out water pressure experiment.

 

Surface Quality Of Steel Pipe

Steel Pipe should not have defects such as crack, scar, folding,
delimination, and lap weid etc. Pull line, scoring, weid seam
dislocation, scuffing not larger than the negative deviance of
wall thickness and the trace of eliminating skin of ferric
oxide and burr are allowed. Internal burr is allowed to exist.

Better than International

Standards

 

Steel casing tube

 

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