ASTM A691 Carbon and Alloy Steel Pipe Specification

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ASTM A691 Pipe

Standard Overview:

ASTM A691 is a standard for electric welded carbon and alloy steel pipes. It is for use in high temperature and high pressure environments. These pipes are usually made by curling and welding multiple steel plates. They have good strength and corrosion resistance.

Main Material:

Carbon steel and alloy steel materials. Common alloy steel materials include 1.25Cr-0.5Mo, 2.25Cr-1Mo, etc.

Scope of Application:

ASTM A691 pipes are widely used in the oil, gas, power, and chemical industries. They are for high-temperature, high-pressure environments, like boilers and piping systems.

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Specification of ASTM A691

Standard	ASTM A691
Application	Standard Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures
Pipe Grade	Alloy Steel ASTM A691 Cl22,1 CR,1/2 CR,1 1/4 CR,2 1/4 CR, 3 CR,5 CR,9 CR,91,CM 65,CM70,CM75
Class Designation	Class 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 34, 40, 41, 42, 43, 50, 51, 52, 53, 60, 61, 62, 63, 70, 71, 72, 73..
Procedure	EFW, ERW, SEAMLESS, LSAW
Outer Diameter	1/2”- 36”
Wall Thickness	SCH10, SCH20, SCH30, STD, SCH40, SCH60, XS, SCH80, SCH100, SCH12,0 SCH140, SCH160, XXS
Pipe Length	Single random length/Double random length 5m-14m,5.8m,6m,10m-12m,12m or as customer’s actual request
Tolerance	OD: +/- 0.5 % of the specified outside diameter
	WT: not more than 0.01 in. (0.3 mm) under the specified nominal thickness.
	Length: within −0,+1⁄2 in. (−0, +13 mm) of specified.
Pipe Surface	Bare,Painting black,varnished,galvanized,anti-corrosion,PE PP/EP/FBE coating
Pipe End	Plain end/Beveled,protected by plastic caps on both ends, cut quare,grooved, threaded and coupling
Technical Method	Hot-rolled/Cold-drawn/Hot-expanded

Dimension

Outside Diameter：	16 in. [405mm] or larger
Wall Thickness：	up to 3 in. [75 mm]
Pipe having other dimensions may be furnished provided it complies with all other requirements of this specification.

Chemical Requirement

Pipe Grade	Type of Steel	ASTM Specification		HB , maxA
Pipe Grade	Type of Steel	Number	Grade	HB , maxA
CM -65	carbon – molybdenum steel	A204/A204M	A	201
CM -70	carbon – molybdenum steel	A204/A204M	B	201
CM -75	carbon – molybdenum steel	A204/A204M	C	201
CmSH -70	carbon – manganese – silicon steel , normalized	A537/A537M	1
CMS -75	carbon – manganese – silicon steel	A299/A299M	–	–
CMSH -80	carbon – manganese – silicon steel , quenched and tempered	A537/A537M	2	–
1/2 CR	1/2% chromium ,1/2% molybdenum steel	A387/A387M	2	201
1CR	1% chromium ,1/2% molybdenum steel	A387/A387M	12	201
1-1/4 CR	11/4% chromium ,1/2% molybdenum steel	A387/A387M	11	201
2-1/4 CR	21/4% chromium ,1% molybdenum steel	A387/A387M	22	201
3CR	3% chromium ,1% molybdenum steel	A387/A387M	21	201
5CR	5% chromium ,1/2% molybdenum steel	A387/A387M	5	225
9CR	9% chromium ,1% molybdenum steel	A387/A387M	9	241
91	9% chromium ,1% molybdenum , vanadium , columbium	A387/A387M	91B	241
A Hardness values listed are applicable to S3. BGrade 91 shall be designated by Type 1 or Type 2 when required by the prevalent specification .

Mechanical Requirement

Pipe Grade	Type of Steel	ASTM Specification		HB , maxA
Pipe Grade	Type of Steel	Number	Grade	HB , maxA
CM -65	carbon – molybdenum steel	A204/A204M	A	201
CM -70	carbon – molybdenum steel	A204/A204M	B	201
CM -75	carbon – molybdenum steel	A204/A204M	C	201
CmSH -70	carbon – manganese – silicon steel , normalized	A537/A537M	1
CMS -75	carbon – manganese – silicon steel	A299/A299M	–	–
CMSH -80	carbon – manganese – silicon steel , quenched and tempered	A537/A537M	2	–
1/2 CR	1/2% chromium ,1/2% molybdenum steel	A387/A387M	2	201
1CR	1% chromium ,1/2% molybdenum steel	A387/A387M	12	201
1-1/4 CR	11/4% chromium ,1/2% molybdenum steel	A387/A387M	11	201
2-1/4 CR	21/4% chromium ,1% molybdenum steel	A387/A387M	22	201
3CR	3% chromium ,1% molybdenum steel	A387/A387M	21	201
5CR	5% chromium ,1/2% molybdenum steel	A387/A387M	5	225
9CR	9% chromium ,1% molybdenum steel	A387/A387M	9	241
91	9% chromium ,1% molybdenum , vanadium , columbium	A387/A387M	91B	241
A Hardness values listed are applicable to S3.
BGrade 91 shall be designated by Type 1 or Type 2 when required by the prevalent specification .

Why Choose UNIASEN?

Welded and with the addition of filler metal. They are manufactured from pressure vessel quality plates with different analysis and strength grades. We ensure that heat treatment is performed as required to achieve the required mechanical properties. Our pipes are classified by the steel grade and heat treatment used in manufacturing.
UNIASEN offers ASTM A691/A691M pipes in a wide range of sizes. Our pipes are available in a variety of diameters, wall thicknesses and lengths, ensuring that we can meet your specific needs.
ASTM A691/A691M pipes are electro-fused. They are for high pressure, high temperature use. UNIASEN’s ASTM A691/A691M pipes come in various sizes to meet your needs.

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