A106 Gr. B carbon steel pipe

ASTM A106 Gr.B seamless steel pipe is a carbon steel pipe with a carbon content of 0.3%, which belongs to the American standard steel pipe and is equivalent to China 20# material.

Gnee is a major supplier of seamless steel pipes, we provide high quality pipes to customers all over the world according to their needs.

A106 GR. B steel pipe is a seamless carbon steel pipe used in high temperature environments. Its carbon content is 0.3%, its manganese content is 0.29-1.06%, its minimum yield strength is 240 MPa, and its minimum tensile strength is 415 MPa. A106 GR. Class B seamless pipe is best suited for applications that transport hot gases and fluids at high temperatures and withstand large amounts of pressure while being economical and long-term wear-resistant.
Additionally the A106 GR. B The cold drawing finishing process of high-temperature pipes must be solid solution annealed in accordance with the heat treatment chapter to restore ferrite. A106 Grade B low carbon steel pipe, commonly used in industries such as oil and gas refineries and petrochemical plants.

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hot rolled seamless steel pipes Specification：

Standard	ASTM, DIN, API, GB,ANSI,EN; ASTM A53, ASTM A106, DIN 17175, API 5L, GB/T9711
Grade Group	BR/BN/BQ,X42R,X42N,X42Q,X46N,X46Q,X52N,X52Q,X56N,X56Q,X56,X60,X65,X70
Out diameter	1/4"-36"
Wall thickness	1.25mm-50mm
Length	3m-12m
Process	Cold drawn tube;Hot rolled tube
Section Shape	Round
Technique	Hot Rolled
Certification	API
Special Pipe	API Pipe
Alloy Or Not	Non-alloy
Application	Water, Gas, Oil transportation seamless steel line pipe
Packaging	Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector
Transportation	By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load)

 

A106 GR.B Hot-rolled Steel Pipes Chemical Requirements

	Grade B
Carbon max. %	0.30*
*Manganese %	*0.29 to 1.06
Phosphorous, max. %	0.035
Sulfur, max. %	0.035
Silicon, min.%	0.10
Chrome, max. %	0.40
Copper, max. %	0.40
Molybdenum, max. %	0.15
Nickel, max. %	0.40
Vanadium, max.%	0.08

 

A106 Gr. B carbon steel seamless pipe Tensile Requirements

	Grade B
Tensile Strength, min., psi	60,000
Yield Strength, min., psi	35,000

 

A106 Gr. B material Permissible Variations in Outside Diameter

NPS	Over	Under
1 1/2 and smaller	1/64"	1/32"
2 -- 4	1/32"	1/32"
5 -- 8	1/16"	1/32"
10 -- 18	3/32"	1/32"
20 -- 26	1/8"	1/32"

 

A106 Gr. B Equivalent Grades

Use the table below for cross-standard sourcing. Equivalence covers chemistry and strength level only; always verify high temperature properties, impact requirements and tolerance class before substitution.

Standard	Grade	Notes
ASTM A106 / ASME SA-106	Grade B	Seamless carbon steel for high temperature service
EN 10216-2	P265GH (1.0425)	European pressure pipe, elevated temperature
DIN 17175	St45.8/III	Former German standard, equivalent pressure part
JIS G3456	STPT370	Carbon steel pipe for high temperature service
GB 3087 / GB/T 8163	20#	Chinese low and medium pressure boiler / fluid pipe
GOST 8731-8734	Steel 20	Russian seamless hot rolled pipe

 

A106 Gr. B vs A53 Gr. B vs API 5L Grade B

Buyers frequently compare the three Grade B carbon pipe standards. The strength levels are nearly identical, but scope and manufacturing routes differ, and choosing the wrong one leads to rejected documentation.

Item	ASTM A106 Gr. B	ASTM A53 Gr. B	API 5L Gr. B (PSL2)
Manufacturing	Seamless only	Seamless or ERW	Seamless, ERW/HFW, LSAW
Intended service	High temperature and pressure	General purpose, ambient service	Pipeline transportation systems
Typical users	Refineries, petrochemical, power plants	Mechanical, plumbing, low pressure lines	Oil and gas transmission pipelines
Min yield, MPa	240	240	245
Min tensile, MPa	415	415	415
Heat treatment	Hot finished: none required; cold drawn: normalize at 900 C min	Hot finished: none; cold drawn: 650 C min	Per PSL2 process requirements
Standard reference	ASTM A106	ASTM A53	API 5L 46th Edition

 

Hot Rolled vs Cold Drawn A106 Gr. B Pipe

Item	Hot Rolled (Hot Finished)	Cold Drawn
Working temperature	Above recrystallization temperature	Room temperature, drawn through die and plug
Dimensional tolerance	Standard, looser	Tighter OD and wall tolerance
Surface	Oxide scaled, pickled on request	Smooth, bright pickled
Heat treatment	Not required	Normalized at 900 C (1650 F) min per ASTM A106
Size range	Best for large OD and heavy wall	Best for small OD, thin wall, precision
Relative cost	Lower	Higher
Best choice for	Refinery headers, boiler piping, structural pressure lines	Instrumentation, heat exchangers, machined parts

 

A106 Gr. B Pipe Sizes and Reference Weights

Item	Range
Outside diameter	1/2" to 36" (21.3 mm to 914 mm)
Wall thickness	Sch 10, 20, STD, 40, 60, 80, 120, 160, XXS
Length	Random 3-7 m, fixed 6-12 m, or as required
Ends	Plain end, beveled, threaded and coupled on request
Marking	Heat number, grade, size, standard, GNEE brand paint stencil

 

Sch 40 reference weights for common sizes:

NPS	OD, mm	Wall, mm	Weight, kg/m
2"	60.3	3.91	5.44
4"	114.3	6.02	16.07
6"	168.3	7.11	28.26
8"	219.1	8.18	42.55
12"	323.9	10.31	79.7

 

A106 Gr.B coated pipe Coating Standard

ASTM A106 Grade B Pipe Coating Type	ASTM A106 Grade B Pipe Coating Layer	ASTM A106 Grade B Pipe Coating thickness
Three layers polyethylene	Inside layer: epoxy (Green)	2.0 -4.5mm
	Mid layer: adhensive (White)
	Outsidelayer:polyethylene (Black)
Two layers polyethylene	Inside layer: adhensive	2.0 -4.5mm
	Outside layer: polythene
Epoxy	Epoxy	200-400um
Two layers epoxy	Inside layer: expoxy (Green)	400-800um
	Outside layer:intensity epoxy (sage green)
Three layers polyethylene	Inside layer: expoxy (Green)	2.5 -3mm
	Mid layer: adhensive (White)
	Outside layer: polypropylene (White)

 

A106 Gr. B Hot Rolled Pipe Price

Indicative FOB China prices, November 2026. Actual quotation depends on size, schedule, quantity, exchange rate and inspection requirements.

Size range	Wall	Indicative FOB price, USD/ton
1/2" - 2"	Sch 40	780 - 950
2" - 8"	Sch 40	680 - 820
8" - 24"	Sch 40 / STD	650 - 780
24" - 36" or heavy wall	Sch 80 and above	700 - 950

MOQ: 1 ton for stock sizes; 5-10 tons for production orders. Contact pipes@gneetube.com for today's firm price.

 

Delivery Time

Order type	Quantity	Lead time
Stock sizes	Any	5 - 10 days after payment
Regular production	10 - 100 tons	15 - 25 days
Large OD / heavy wall	100+ tons	25 - 40 days

 

Quality Inspection and Certification

Inspection item	Requirement	Document
Chemical composition	ASTM A106 Table 1 limits, heat analysis	EN 10204 3.1 MTC
Tensile test	Min yield 240 MPa, min tensile 415 MPa	EN 10204 3.1 MTC
Flattening test	Per ASTM A106 for seamless pipe	MTC record
Hardness test	Brinell or Rockwell per standard	MTC record
Hydrostatic or NDT	Hydrostatic test or eddy current / UT each length	Test report
Dimensional check	OD, wall, length, ovality per Table X3-X4	Inspection report
Visual and surface	No laps, cracks, seams per acceptance limits	Inspection report
Heat number traceability	Every pipe marked with heat number	Stencil + MTC
Third party inspection	SGS / BV / TUV on request	Third party certificate
Impact test (supplementary)	Charpy V-notch when specified (S-series)	Supplementary test report

 

Packing and Shipping

A106 Gr. B hot rolled pipes are supplied in bundles with steel strapping, or loose for large OD. Options include wooden pallets, wooden cases, plastic cloth wraps, plastic end caps and beveled protectors. Surface can be black varnish, FBE, 3LPE/3LPP or galvanized on request. Shipping is arranged by road, rail or sea (FCL or break-bulk), and each bundle carries an export marks stencil matching the MTC heat numbers.

 

How to Order A106 Gr. B Hot Rolled Steel Pipe

Send your enquiry with quantity, size (NPS and schedule), standard, end finish, coating and destination port, and our sales engineers reply with a firm quotation within 24 hours.

Email: pipes@gneetube.com

WhatsApp / WeChat: +86 158 2468 7445

Related products: ASTM A106 Carbon Steel Pipe, ASTM A53 Grade B Pipe, A106 Gr. B Sch40 Pipe, ASTM A106 A53 Carbon Pipe

 

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FAQ

What is ASTM A106 Gr. B hot rolled steel pipe?

ASTM A106 Gr. B is a seamless carbon steel pipe specification for high temperature and pressure service. Hot rolled means the pipe is finished by hot rolling without cold drawing, so it needs no post heat treatment. Grade B has carbon max 0.30%, min yield strength 240 MPa (35,000 psi) and min tensile strength 415 MPa (60,000 psi).

 

What is ASTM A106 Gr. B equivalent to?

Common equivalent grades are GB 20# (GB 3087 / GB/T 8163) in China, P265GH (1.0425) under EN 10216-2, St45.8/III under DIN 17175 and STPT370 under JIS G3456. Equivalence is approximate, so confirm impact, high temperature property and tolerance requirements before substitution.

 

What is the difference between ASTM A106 Gr. B and A53 Gr. B?

Both have the same Grade B strength level (min yield 240 MPa, min tensile 415 MPa), but A106 is seamless only and intended for high temperature pressure service, while A53 covers both seamless and ERW welded pipe for general purpose use. Refineries and power plants normally specify A106 Gr. B.

 

What sizes and schedules are available for A106 Gr. B hot rolled pipe?

Outside diameter from 1/2 inch to 36 inch, wall thickness from Schedule 10 to Schedule 160 and XXS, random lengths 3-7 m or fixed lengths 6-12 m. Common Sch 40 reference weights: NPS 2 is 5.44 kg/m, NPS 4 is 16.07 kg/m, NPS 6 is 28.26 kg/m, NPS 8 is 42.55 kg/m and NPS 12 is 79.7 kg/m.

 

How is hot rolled A106 Gr. B pipe different from cold drawn pipe?

Hot rolled pipe is finished above recrystallization temperature, gives a looser tolerance and a scaled surface, and needs no heat treatment. Cold drawn pipe is drawn at room temperature, gives tighter tolerance and a smoother surface, and per ASTM A106 must be normalized at 900 C (1650 F) or higher after drawing.

 

How much does A106 Gr. B pipe cost and what is the delivery time?

Indicative FOB China price is about USD 620-950 per ton depending on size, schedule, quantity and market. Stock sizes ship in 5-10 days, regular production takes 15-25 days, and large OD or heavy wall takes 25-40 days. Contact sales@gneetube.com for a firm quotation.

 

What certificates do you provide with A106 Gr. B pipe?

Each order ships with EN 10204 3.1 mill test certificate covering chemical composition, tensile test and heat treatment records, with heat number traceability. Third party inspection by SGS, BV or TUV can be arranged on request, and PMI or impact test can be added as supplementary requirements.

 

Can I get a sample before ordering?

Yes of course. Usually our samples are free. We can produce according to your samples or technical drawings. We can manufacture molds and fixtures.

 

How can you guarantee that what I get will be good?

We are a factory with 100% pre-delivery inspection to ensure quality.

 

How do you make our business establish a long-term and good relationship?

1. We maintain good quality and competitive prices to ensure our customers benefit;
2. We respect every customer as our friend and we sincerely do business and make friends with them.

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