ASTM A106 Seamless Carbon Steel Pipe

Description

A106 seamless pipe, also called A106 seamless pressure pipe, in various sizes and profiles. This pipe is commonly specified for applications where piping is used to transport fluids and gasses at high temperatures and/or pressures. A106 seamless pressure pipe a key component in power plants, oil and gas refineries, petrochemical processing plants, boilers, and more.  The ASTM A106 pipe of Grade B is a seamless carbon steel specification that works in high temperature services. ASTM A106 Grade B pipe is designed with a chemical composition of chromium, nickel, molybdenum, and other constituting alloys. The A106 pipe has excellent corrosion resistance properties and works well across different oxidative environments.

The ASTM A106 Gr.B Material is designed having excellent mechanical properties. This material has a minimum tensile strength of 60,000psi with a minimum yield strength of 35,000psi. The A106 Gr B pipe of this specification is well suited for bending, flanging, and different forging operation. The A106 pipe suppliers can supply the pipes in seamless, welded, and erw specifications.

An A106 gr.b grade pipe is designed in sizes of NPS 1/8 to NPS 48. The pipe is designed in schedules of SCH 20 through XXH. The SA 106 Gr B works well in higher temperatures and can be either hot or cold rolled. The pipes have plain, bevelled, and threaded ends.

ASTM A106 Grade B is a mild steel pipe material usually used in industrial plants, power plants, power plants, refineries, and chemical plants. ASTM A106 GR. B Carbon Steel Seamless pipes must be solution annealed according to the heat treatment part to restore the ferrite.

A106 pipe has three grades: Grade A and Grade B and C, where in most circumstances used for Grade B.

ASTM A106 pipe (also covered in ASME specifications as S/A 106) is the standard specification for seamless carbon steel pipe for high-temperature service. Most common uses are in refineries and plants when gasses or fluids are transported at high temperatures and pressures.

Chemical composition (%) of ASTM A106

Grade	C≤	Mn	P≤	S≤	Si≥	Cr≤	Cu≤	Mo≤	Ni≤	V≤
ASTM A106 GradeA	0.25	0.27-0.93	0.035	0.035	0.1	0.4	0.4	0.15	0.4	0.08
ASTM A106 GradeB	0.3	0.29-1.06	0.035	0.035	0.1	0.4	0.4	0.15	0.4	0.08
ASTM A106 GradeC	0.35	0.29-1.06	0.035	0.035	0.1	0.4	0.4	0.15	0.4	0.08

For each reduction of 0.01% for maximum carbon element, an increase of 0.06% manganese above the specified value shall be permitted, and up to maximum of 1.35%. Elements Cr, Cu, Mo, Ni, V combined shall not exceed 1%.

Mechanical properties of ASTM A106

Grade	Rm Mpa Tensile Strength	Yield Point (Mpa)	Elongation	Delivery Condition
ASTM A106 GradeA	≥330	≥205	20	Annealed
ASTM A106 GradeB	≥415	≥240	20	Annealed
ASTM A106 GradeC	≥485	≥275	20	Annealed

JIS			ASTM			BS			DIN			NF			ISO			Index Number
Std.No	Grade	Type	Std.No	Grade	Type	Std.No	Grade	Type	Std.No	Grade	Type	Std.No	Grade	Type	Std.No	Grade	Type
JIS G3456	STPT370	C	ASTM A106	GrA	C	3602	HFS360	C	17175	St35.8	C	A49-211	TU37b	C	2604-02-01 00:00:00	TS5	C	C004
	(STPT38)					"	CFS360	C	17177	St37.8	C	A49-213	TU37c	C	2604-03-01 00:00:00	TW9H	C
						"	ERW360	C				A49-243	TU37c	C
						"	CEW360	C
	STPT410	C	ASTM A106	GrB	C	3602	HFS410	C	17175	St45.8	C	A49-211	TU42b	C	2604-02-01 00:00:00	TS9H	C
	(STPT42)					"	CFS410	C	17177	St42.8	C	A49-213	TU42c	C
						"	ERW410	C				A49-243	TU42c	C
						"	CEEW410	C
	STPT480	C	ASTM A106	GrC	C	3602	HFS460	C				A49-211	TU48b	C	2604-02-01 00:00:00	TS14	C
	(STPT42)					"	CFS460	C				A49-213	TU48c	C
						"	ERW460	C
						"	CEEW460	C

Lengths
Lengths required shall be specified on order. No “jointers” permitted unless otherwise specified. If no definite lengths required, following practice applies: Single Random — 17′ ~ 24′ lengths Double Random — 36′ ~ 44′ lengths

Required Markings on Each Length
(On Tags attached to each Bundle in case of Bundled Pipe) Rolled, Stamped, or Stenciled (Mfrs. Option) Manufacturer’s name or brand. Length of pipe. A106 A, A 106 B, A 106 C. ANSI schedule number. Hydrostatic test pressures and/or NDE; Weight per foot (NPS 4 and larger) or NH if neither is specified. Additional “S” if tested supplementary requirements.

Referenced Documents

• ASTM A 530/A 530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
• ASTM E 213 Practice for Ultrasonic Examination of Metal Pipe and Tubing
• ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
• ASTM E 381 Method of Macroetch testing Steel Bars, Billets, Blooms, and Forgings
• ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
• ASME B36.10M Welded and Seamless Wrought Steel Pipe

What is the difference between A106 Gr B Pipe lining and coating?

Lining and coating on the A106 Steel pipe is done to protect the surface of the pipe against corrosion and different affluents. The coated A106b pipe helps in coating the outer surface of the material. They prevent contaminants from entering the piping structures. A lined SA 106 gr b pipe covers the interior surface of a pipe or other structures. The lining is performed in structures that transport volatile liquids and gases.

What is A106 galvanized pipe?

The A106 galvanized pipe is dipped into a protective zinc coating to prevent the formation of corrosion and rust. The galvanized A106 carbon steel pipe offers complete protection and is easy to clean and inspect.

Weight Chart of A106 Carbon Steel Pipe

What is the difference between ASTM A53 and ASTM A106?

A53 pipe is best suited for transport of air, water, steam and oil in low- and medium pressure applications across the industrial spectrum. It’s also commonly used as structural steel. A106 pipe is formulated specifically for high-temperature and high-pressure service, usually in power generation applications.

A106 Steel Pipe Testing Requirements

• Hydrostatic Testing: In hydrostatic testing, A106 seamless steel pipe samples are subjected to test pressure at 60% of specified minimum yield strength, at ambient temperatures; pressure test is maintained for at least five seconds. Maximum test pressures shall not exceed 2,500 psi for NPS3 steel pipe, or 2,800 psi for all larger sizes.
• Mechanical Testing: A106 seamless pipe NPS 8 and larger are weighed in lots; larger sizes are weighed by length. Flattening tests are required on A106 pipe NPS 2-1/2 and larger; cold bend testing is required for A106 pipe NPS 2 and smaller.

A106B vs A106C vs A53B Type S (Seamless)

What is the difference between the material specifications for A106 Grade B Seamless pipe and A53 Grade B (Type S) seamless pipe?

We are sometimes asked this question by Customers and whether or not they are interchangeable. This article will focus on comparing the three most commonly requested ones- A106B, A106C and A53B seamless and will highlight some of the key factors an engineer would focus on in their selection process.

First and foremost, let’s start with the most important concept – suppliers and manufacturers must always follow the designated requirements and specifications invoked for a specified line item or order.

A customer must exercise caution when evaluating these specifications to allow proper selection between these two materials. For starters, a visual inspection of the pipe will determine whether or not the pipe is seamless or welded, but it will not reveal which specification.

A106 is only produced as a seamless product and is available in three grades; A, B, C. There are no Types in A106 because it is produced only as a seamless product.

A53 comes in two grades and three types. A53 can be produced as a seamless product (A53 Grade A Type S (Seamless) and A53 Grade B Type S (Seamless) or as a welded product (A53 Grade B Type E (Welded), A53 Grade A Type E (Welded) or A53 Grade A Type F (Welded)).

Seamless pipe is often made by drawing a solid shape over a mandrel to form the configuration of a tube. Welded pipe is more commonly made by rolling a flat strip of material into a tube and joining the edges together with a longitudinal weld. The weld can be made by either Electric Resistance Welding (Type E) or by Furnace Butt Welded/Continuous Welding (Type F).

The ASTM A106 specification is for seamless carbon steel pipe for High-Temperature Service. A106 must be produced with killed steel. It covers nominal pipe sizes (NPS) 1/8” NPS to 48 NPS”. For sizes 1- 1/2” NPS and under, A106 may be produced by two different processes; either hot finished or cold drawn. Unless otherwise specified, pipe 2″ NPS and over shall be furnished hot finished. Typical uses for A106 are for handling liquids and gasses at high temperatures and pressures in power plants, oil refineries, and industrial facilities.

The ASTM A53 specification is for steel pipe of welded or seamless construction, and available in black or hot-dipped zinc-coating (aka galvanized) ³. A53 does not require the use of killed steel as a starting material. It covers nominal pipe sizes 1/8” NPS to NPS 26” NPS. It is incumbent upon a purchaser to request the grade and type, whether black or galvanized, and the desired end configuration. A53 does not require nor prohibit any specific process (such as hot finished or cold drawn or other process) in the production of seamless pipe. Typical uses of A53 pipe are structural applications or for low pressure fluid systems such as air, gas, and water.

Since A106 seamless can be hot finished or cold drawn, in very, very basic terms the difference between the two is a matter of the temperature at which the process is performed. Hot finished pipe is produced at temperatures over about 1700F° while cold drawn is produced at much lower temperatures and with more processing. In general, cold drawn pipe has an improved surface finish and better dimensional control.

As one can see in the Chemical Composition Chart below it is first important to identify the actual specifications and grades by the revision years to effectively compare. Here we will compare the ASTM A106-15 in both the B and C grades to ASTM A53-12 Grade B in Type S (Seamless).

As one can see in the charts below, there are no major differences in chemistry and mechanical properties that would prevent a mill from producing a pipe that will meet these requirements of A106 Grade B and A53 Grade B Type S (Seamless).

Now let’s look at the chemistry nuances as there is a more to review. First, the specified elements within the two specifications are not the same. A53B does not have a requirement for minimum silicon content (although silicon can be present); for A106, however, the minimum silicon content is 0.10%. Silicon is regarded as an important element for improving the heat resistance ability. The manganese, phosphorous and sulfur requirements are different, but the maximums are quite high and material rarely approaches these values. The remaining elements are the same for the B grades.

As for the mechanical properties, A106-15 Grade B and A53-12 Grade B Seamless have the same tensile strength, yield strength and the same elongation values in 2” NPS when tested with a longitudinal strip test specimen.

What then are the differences between A106 grades B and C?⁶ The maximum allowable carbon content is higher in Grade C; which can result in higher mechanical properties due to this increased carbon content. An engineer may be interested in this higher tensile and yield strength provided by Grade C when selecting materials for high temperature service.

Regarding the need for heat treatment, the only requirements are A106 requires cold drawn material to be stress relieved at 1200°F or higher. A53 Grades A and B seamless products do not require heat treatment at all.

Additional points where differences exist between A106 and A53 include weight, dimensions, and end finish. For A53, the weight of any pipe shall not vary more than 10% from its specified weight. For A106, the mass of any length of pipe shall not vary more than 10% over and 3.5% under that specified.

Dimensions are different and may be more restrictive in either specification; depending on the ordered size in NPS. Please refer to the Dimensions Chart below for specific tolerances for the outside diameter. A53 and A106 have the same wall thickness tolerance; the minimum wall at any point shall not be more than 12.5% under the specified wall thickness.

The end finish for A106 pipe 1-1/2” NPS and less for all wall thicknesses shall be plain end square cut or plain end beveled at the option of the manufacturer. For A106 pipe of 2” NPS and larger, walls through extra strong shall be plain end beveled, and walls over extra strong shall be plain end square cut. Threaded ends are not an available option.

Available end finishes in A53 are plain end or threaded. Plain ends may be either beveled or square cut. For 1-1/2” NPS and less, the end finish is the option of the manufacturer unless otherwise specified. 2” NPS and larger pipe of standard or extra strong weight, or wall thickness less than .500” (except double extra- strong) shall be plain end beveled. Pipe with a specified wall thickness greater than .500” and all double extra-strong pipe shall be plain end square cut. Threaded ends are available and may be ordered with couplings.

Dual certification occurs when a manufacturer produces pipe that meets the more stringent requirements between the specifications involved; including, but not limited to, melt practice and processing, chemistry control, dimensions, and weight per length. It is easy to understand, therefore, how it is possible for a mill to dual certify pipe as A106 Grade B and A53 Grade B Type S (Seamless); or even triple certify as A106 Grade B/C and A53 Grade B Type S (Seamless)

Not surprising, it is common for a customer (be it a purchasing professional or engineer) to request A106 as an alternative to A53 seamless. Based on a customer’s review and decision-making and that the requirement is not for galvanized pipe, we can provide this alternative.

Comparison Charts:

Chemical Composition Chart:

Standard	Grade	Process	Chemical Composition %
			C max	Mn*	P max	S max	Si min	Cr˟ max	Cu˟ max	Ni˟ max	Mo˟ max	V˟ max
ASTM A106-15	B	SMLS	0.30*	0.29-1.06	0.035	0.035	0.10	0.40	0.40	0.40	0.15	0.08
ASTM A106-15	C	SMLS	0.35*	0.29-1.06	0.035	0.035	0.10	0.40	0.40	0.40	0.15	0.08
ASTM A53-12	B	SMLS	0.30*	1.20	0.05	0.045	—	0.40	0.40	0.40	0.15	0.08

*	For each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum will be permitted up to a maximum of 1.65%.
x	The sum of these five elements shall not exceed 1% (1.00% for A53)
—	No requirement for this element

Mechanical Properties Chart:

Standard	Grade
		Process	Tensile Strength (MPa) Min	Yield Strength (MPa) Min	Elongation in 2” (%) MinimumLong. Strip Test	Elongation in 2” (%) MinimumTrans. Strip Test
ASTM A106-15	B	SMLS	60,000 [415]	35,000 [240]	30	16.5
ASTM A106-15	C	SMLS	70,000 [485]	40,000 [275]	30	16.5
ASTM A53-12	B	SMLS	60,000 [415]	35,000 [240]	30	See Spec

Dimensions Chart:

Standard	Permissible Variations in Outside Diameter
	NPS”	OVER	UNDER
ASTM A53-12	1-1/2 and less	1/64” (0.015”)	1/64” (0.015”)
ASTM A53-12	2 and over	1% of OD	1% of OD
ASTM A106-15	1/8 to 1-1/2	1/64” (0.015”)	1/64” (0.015”)
ASTM A106-15	Over 1-1/2 to 4	1/32” (0.031”)	1/32” (0.031”)
ASTM A106-15	Over 4 to 8	1/16” (0.062”)	1/32” (0.031”)
ASTM A106-15	Over 8 to 18	3/32” (0.093”)	1/32” (0.031”)
ASTM A106-15	Over 18 to 26	1/8” (0.125”)	1/32” (0.031”)
ASTM A106-15	Over 26 to 34	5/32” (0.156”)	1/32” (0.031”)
ASTM A106-15	Over 34 to 48	3/16” (0.187”)	1/32” (0.031”)