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API 5L Carbon Steel Pipes/Black Steel Pipe

API 5L Carbon Steel Pipes/Black Steel Pipe Specification

API 5L Carbon Steel Pipes/Black Steel Pipe (line pipe specification) is a specification developed by the United States Petroleum Institute.The specification only for steel products,including pipeline design,selection and installation.Traditionally the technical requirements of API 5L Carbon Steel Pipes/Black Steel Pipe is more reasonable,taking into account the technical requirements of the pipeline steel and the factory production possibilities,but to the technical requirements in the development of the the relative pipeline and pipe technology, API 5L seems relatively loose,It has been rarely used alone on the applicable to pipeline project.

API 5L Black Steel Pipe with Beveled End, Plastic Cap and Black Paint
Outside diameter: 21.3-914mm (1/2-38 inch)
Thickness: SCH 20 to SCH 140 (2mm-36.5mm)
Standard: API 5L, ASTM A106 .ASTM A53,EN10216,EN10218,EN10219,EN10210
Steel Grade:A,B,X42,X46,X52,X56,X60,X65,16Mn,ST37,ST52,P195tr2,P235tr2,P265tr2,P195tr1,P235tr1,P265tr1.
Packing: Labeled and bundled together with steel strip
Application: Low,medium and high pressure boiler,transportation for gas,water,oil and natural gas,tubes for heat exchanger and chemical fertilizer equipments, for hydraulic pillar service etc.

API 5L Steel Pipe Chemical Composition

Grade	Chemical Composition
	C	Si	Mn	P	S	V	Nb	Ti
API 5L X42	0.16	0.45	1.65	0.020	0.010	0.07	0.05	0.04
API 5L X52	0.16	0.45	1.65	0.020	0.010	0.07	0.05	0.04
API 5L X60	0.16	0.45	1.65	0.020	0.010	0.08	0.05	0.04
API 5L X65	0.16	0.45	1.65	0.020	0.010	0.09	0.05	0.06
API 5L X70	0.17	0.45	1.75	0.020	0.010	0.10	0.05	0.06

API 5L X Grades Pipe Mechanical Properties

Grade	Yield Strength	Tensile Strength	Yield to Tensile	Elongation
	min. (KSI)	min. (KSI)	Ratio (max)	%
API 5L X42	42	60	0.93	23
API 5L X52	52	66	0.93	21
API 5L X60	60	75	0.93	23
API 5L X65	65	77	0.93	18
API 5L X70	70	82	0.93	17

The various test is done while manufacturing-

Hydrostatic test- this test is done to check that there is no leakage through pipe body and weld seam. The pipe is thus, made to withstand the hydrostatic test.

Bend test - in this test it is seen that no cracks shall take place in any part of test piece as well as no opening of welded pipe must occur.

Flattening test - approval criteria for the flattening test are-
EW pipe D < 12.750 in and X60 with the T500in, there must be no opening of weld prior to the distance between plates less than 66 percent of the original diameter. Pipe with the D/t > 10, no opening must be seen of the weld before the distance between plates less than 30 percent of the original diameter.

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