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Steel casing and tube

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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