Seamless Pipes for Low and Medium Pressure Service are designed for efficient and reliable performance in applications such as heating systems, plumbing, and industrial fluid transport. These medium pressure seamless tubes comply with standards like ASTM A106, ASTM A53, and EN 10216-1, offering excellent strength, corrosion resistance, and cost-effectiveness for low to medium pressure environments up to 100 bar and temperatures up to 400°C.

Manufactured primarily from carbon steel (e.g., A106 Grade B, A53 Grade B) or low-alloy steel, carbon steel seamless pipes are produced through hot-rolling or cold-drawing processes, ensuring precise dimensions and a smooth surface finish. Available in sizes from 1/8” to 24” (DN6–DN600) with wall thicknesses from SCH 10 to SCH 80, these pipes are ideal for applications like hot water boilers, air conditioning systems, and low-pressure gas pipelines. Their seamless construction eliminates weld-related weaknesses, ensuring durability and leak-free performance.

Corrosion-resistant seamless piping undergoes rigorous testing, including hydrostatic, tensile, and flattening tests, to ensure compliance with industry standards. With tensile strengths ranging from 400 MPa (A53 Grade B) to 415 MPa (A106 Grade B), these pipes offer reliable performance under moderate pressure and temperature conditions. Surface treatments such as galvanizing, epoxy coatings, or 3LPE enhance corrosion resistance, making them suitable for handling water, steam, or mildly corrosive fluids in industrial settings.

Compared to welded pipes, low pressure boiler tubes provide superior integrity and uniform strength, reducing maintenance costs in applications like heating systems and plumbing networks. Their smooth internal surfaces minimize friction, improving fluid flow efficiency. These pipes are customizable for specific project needs, offering flexibility in size, grade, and coating options to meet diverse requirements in residential, commercial, and industrial systems.

By addressing challenges like corrosion, pressure fluctuations, and fluid transport efficiency, seamless fluid transport pipes deliver reliable, cost-effective solutions. Whether used in district heating, process piping, or low-pressure gas distribution, these pipes ensure safety, longevity, and performance in low to medium pressure applications.

Chemical Composition of ASTM A106 Grade B, ASTM A53 Grade B, and EN 10216-1 P235TR1
Grade	C (% max)	Si (% max)	Mn (% max)	P (% max)	S (% max)
ASTM A106 Grade B	0.30	0.10 min	0.29–1.06	0.035	0.035
ASTM A53 Grade B	0.30	-	1.20	0.05	0.045
EN 10216-1 P235TR1	0.16	0.35	1.20	0.025	0.020

The chemical composition ensures strength, weldability, and corrosion resistance for low to medium pressure applications.

Mechanical Properties of ASTM A106 Grade B, ASTM A53 Grade B, and EN 10216-1 P235TR1
Grade	Tensile Strength (MPa min)	Yield Strength (MPa min)	Elongation (% min)
ASTM A106 Grade B	415	240	30
ASTM A53 Grade B	415	240	29.5
EN 10216-1 P235TR1	360–500	235	25

These properties ensure durability and reliability in low to medium pressure environments.

Key Benefits

Reliable Performance

Handles low to medium pressures up to 100 bar with leak-free integrity.

Corrosion Resistance

Coatings and material grades protect against corrosion in fluid systems.

Seamless Integrity

No weld seams ensure uniform strength and durability.

Temperature Resistance

Withstands temperatures up to 400°C in heating systems.

Cost-Effective

Low maintenance and high durability reduce long-term costs.

Versatility

Suitable for heating, plumbing, and industrial fluid transport.

Seamless pipes for low and medium pressure service are weld-free pipes designed for heating, plumbing, and fluid transport in pressures up to 100 bar.

Common materials include carbon steel (A106 Grade B, A53 Grade B) and low-alloy steel for strength and corrosion resistance.

- ASTM A106 Grade B: C ≤0.30%, Mn 0.29–1.06%, P ≤0.035%, S ≤0.035%
- ASTM A53 Grade B: C ≤0.30%, Mn ≤1.20%, P ≤0.05%, S ≤0.045%
- EN 10216-1 P235TR1: C ≤0.16%, Si ≤0.35%, Mn ≤1.20%, P ≤0.025%, S ≤0.020%

- ASTM A106 Grade B: Tensile ≥415 MPa, Yield ≥240 MPa, Elongation ≥30%
- ASTM A53 Grade B: Tensile ≥415 MPa, Yield ≥240 MPa, Elongation ≥29.5%
- EN 10216-1 P235TR1: Tensile 360–500 MPa, Yield ≥235 MPa, Elongation ≥25%

Sizes range from 1/8” to 24” (DN6–DN600), with wall thicknesses from SCH 10 to SCH 80, customizable for specific applications.

Hydrostatic, tensile, flattening, and non-destructive tests ensure compliance with ASTM and EN standards.

Heating systems, plumbing, low-pressure boilers, process piping, air conditioning, and gas distribution.

Galvanizing, epoxy coatings, or 3LPE treatments protect against corrosion in water, steam, or gas systems.

Seamless pipes offer uniform strength, no weld seams, and higher reliability for fluid transport and pressure applications.

Yes, their durability and low maintenance make them cost-effective for heating, plumbing, and industrial applications.

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Standards and Specifications

• Seamless pipes for low pressure ASTM A106
• Medium pressure seamless tubes EN 10216-1
• Carbon steel seamless pipes standards
• Low pressure boiler tubes specifications

Applications

• Seamless pipes for heating systems
• Seamless fluid transport pipes for plumbing
• Low pressure boiler tubes for industrial use
• Medium pressure seamless tubes for gas distribution

Material and Grades

• ASTM A53 Grade B seamless pipes
• ASTM A106 Grade B seamless tubes
• EN 10216-1 P235TR1 seamless pipes
• Carbon steel seamless piping grades

Manufacturing and Testing

• Seamless pipes manufacturing process
• Low pressure seamless tubes testing
• Carbon steel seamless pipes quality
• Corrosion-resistant seamless piping standards

Note: Seamless pipes for low and medium pressure service meet ASTM and EN standards, ensuring reliability and performance. Contact suppliers for detailed specifications.

Technical Specifications

Explore the dimensional ranges and common applications of various seamless pipe types.

Typical dimensional ranges for seamless steel pipe types
Type	Outer Diameter	Wall Thickness	Length	Applications
Hot-Rolled Seamless	Above 32 mm	2.5 – 200 mm	Up to 12 m	General industrial, structural
Cold-Rolled Seamless	6 – 650 mm	0.25 – 50 mm	Up to 12 m	Precision applications
Thin-Walled Pipe	5 – 100 mm	Less than 0.25 mm	Up to 6 m	Instrumentation, automotive
Heavy Wall Pipe	50 – 650 mm	10 – 200 mm	Up to 12 m	High pressure, structural

Seamless Pipe Specification Chart
DN	NB (inch)	OD (mm)	Nominal Wall Thickness (mm)
DN	NB (inch)	OD (mm)	SCH10	SCH20	SCH30	STD	SCH40	SCH60	XS	SCH80	SCH100	SCH120	SCH140	SCH160	XXS
15	1/2"	21.3	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
20	3/4"	26.7	2.11		2.41	2.87	2.87		3.91	3.91				5.56	7.82
25	1"	33.4	2.77		2.90	3.38	3.38		4.55	4.55				6.35	9.09
32	1.1/4"	42.2	2.77		2.97	3.56	3.56		4.85	4.85				6.35	9.70
40	1.1/2"	48.3	2.77		3.18	3.68	3.68		5.08	5.08				7.14	10.15
50	2"	60.3	2.77		3.18	3.91	3.91		5.54	5.54				8.74	11.07
65	2.1/2"	73	3.05		4.78	5.16	5.16		7.01	7.01				9.53	14.02
80	3"	88.9	3.05		4.78	5.49	5.49		7.62	7.62				11.13	15.25
90	3.1/2"	101.6	3.05		4.78	5.74	5.74		8.08	8.08
100	4"	114.3	3.05		4.78	6.02	6.02		8.56	8.56				13.49	17.12
125	5"	141.3	3.4			6.55	6.55		9.53	9.53		12.7		15.88	19.05
150	6"	168.3	3.4			7.11	7.11		10.97	10.97		14.27		18.26	21.95
200	8"	219.1	3.76	6.35	7.04	8.18	8.18	10.31	12.7	12.7	15.09	18.26	20.62	23.01	22.23
250	10"	273	4.19	6.35	7.8	9.27	9.27	12.7	12.7	15.09	18.26	21.44	25.4	28.58	25.4
300	12"	323.8	4.57	6.35	8.38	9.53	10.31	14.27	12.7	17.48	21.44	25.4	28.58	33.32	25.4
350	14"	355.6	6.35	7.92	9.53	9.53	11.13	15.09	12.7	19.05	23.83	27.79	31.75	35.71
400	16"	406.4	6.35	7.92	9.53	9.53	12.7	16.66	12.7	21.44	26.19	30.96	36.53	40.19
450	18"	457.2	6.35	7.92	11.13	9.53	14.27	19.05	12.7	23.83	39.36	34.93	39.67	45.24
500	20"	508	6.35	9.53	12.7	9.53	15.09	20.62	12.7	26.19	32.54	38.1	44.45	50.01
550	22"	558.8	6.35	9.53	12.7	9.53		22.23	12.7	28.58	34.93	41.28	47.63	53.98
600	24"	609.6	6.35	9.53	14.27	9.53	17.48	24.61	12.7	30.96	38.89	46.02	52.37	59.54
650	26"	660.4	7.92	12.7		9.53			12.7
700	28"	711.2	7.92	12.7	15.88	9.53			12.7
750	30"	762	7.92	12.7	15.88	9.53			12.7
800	32"	812.8	7.92	12.7	15.88	9.53	17.48		12.7
850	34"	863.6	7.92	12.7	15.88	9.53	17.48		12.7
900	36"	914.4	7.92	12.7	15.88	9.53	19.05		12.7

Seamless Pipes

Minimum Thickness

Seamless pipes, available in various wall thicknesses, are designed for precise applications, with cold-rolled thin-walled pipes achieving thicknesses as low as 0.25 mm or less.

The outer diameter of hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-200mm, the outer diameter of cold-rolled seamless steel pipe can be 6mm, the wall thickness can be 0.25mm, the outer diameter of thin-walled pipe can be 5mm, and the wall thickness is less than 0.25mm, cold rolling

The ability to produce seamless pipes with ultra-thin walls and controlled ovality makes them critical for industries like automotive, hydraulics, and petrochemicals, ensuring reliability and performance.

Permissible Variations in Outside Diameter of Steel Pipes
NPS/ DN/ OD	Permissible Variations in Outside Diameter
	Over		Under
	in.	mm	in.	mm
NPS 1/8 to 1½, incl DN 6 to 40 OD 10.3 to 48.3, mm	1/64	0.4	1/64	0.4
Over 1½ to 4, incl DN 40 to 100 OD 48.3 to 114.3, mm	1/32	0.8	1/32	0.8
Over 4 to 8, incl DN 100 to 200 OD 114.3 to 219.1, mm	1/16	1.6	1/32	0.8
Over 8 to 18, incl DN 200 to 450 OD 219.1 to 457, mm	3/32	2.4	1/32	0.8
Over 18 to 26, incl DN 450 to 650 OD 457 to 660, mm	1/8	3.2	1/32	0.8

According to the production method, seamless tubes are divided into hot - rolled tubes, cold - rolled tubes, cold - drawn tubes, extruded tubes, jacking tubes, etc. The maximum diameter is 650 mm and the minimum diameter is 0.3 mm. Depending on the application, there are thick - walled tubes and thin - walled tubes. Seamless steel tubes are mainly used as petroleum geological drilling tubes, cracking tubes for petrochemical industry, boiler tubes, bearing tubes and high - precision structural steel tubes for automobiles, tractors and aviation. In the plate, Q345B seamless steel pipe belongs to the low - alloy series.

Among the low - alloy materials, this kind of material is the most common. The outside diameter of hot - rolled seamless pipe is usually more than 32mm, the wall thickness is 2.5 - 200mm, the outside diameter of cold - rolled seamless steel pipe can be 6mm, the wall thickness can be 0.25mm, the outside diameter of thin - walled pipe can be 5mm, and the wall thickness is less than 0.25mm, cold rolling has higher dimensional accuracy than hot rolling.

Common Standards for Seamless Pipes

A consolidated overview of international seamless pipe standards, their materials, and applications.

Overview of Seamless Pipe Standards from ASTM, API, JIS, and GB
Standard System	Standard Code	Material Type	Typical Applications
ASTM / ASME (USA)	ASTM A53	Carbon Steel	General-purpose piping, structural
	ASTM A106	Carbon Steel	High-temperature service
	ASTM A179	Low Carbon Steel	Heat exchangers, condensers
	ASTM A333	Carbon/Alloy Steel	Low-temperature service
	ASTM A335	Alloy Steel	High-temperature, pressure piping
	ASTM A213 / A209	Alloy/Stainless Steel	Boilers, superheaters
	ASTM A312	Stainless Steel	Corrosion-resistant piping
	ASTM A519	Carbon/Alloy Steel	Mechanical tubing (e.g., SAE 1026)
	ASTM A790	Duplex Stainless Steel	High-strength, corrosion-resistant service
API (Oil & Gas)	API 5L	Carbon Steel	Oil & gas pipelines
API (Oil & Gas)	API 5CT	Carbon Steel	Casing & tubing for wells
JIS (Japan)	JIS G3454/G3455/G3456	Carbon Steel	Pressure piping service
	JIS G3460	Carbon Steel	Boilers, heat exchangers
	JIS G3429	High-strength Steel	High-pressure gas cylinders
GB (China)	GB 3087	Carbon Steel	Low & medium pressure boilers
	GB 5310	Carbon Steel	High-pressure boiler pipes
	GB/T 8163	Carbon Steel	Fluid and structural use

Industry Applications

Seamless pipes are critical in various industries thanks to their excellent strength, temperature resistance, and structural uniformity. They ensure safe and efficient performance in demanding environments.

Power Generation

Used in steam pipelines, boiler tubes, superheaters, and heat exchangers for high-temperature and high-pressure conditions in power plants.

Oil & Gas Industry

Transports crude oil, natural gas, and petroleum products in pipelines and refinery units, handling high-pressure and corrosion.

Chemical & Petrochemical

Handles chemicals, gases, and hazardous substances in reactors and heat exchangers, ensuring safe processing.

Mechanical & Automotive

Applied in automotive systems and machinery for fluid conveyance and precision components requiring strength and accuracy.

Construction & Structural

Used in structural support, water and sewage systems, and building frameworks for strength and corrosion resistance.

Marine & Shipbuilding

Utilized in hydraulic and engine systems onboard, resisting corrosion in marine environments.

Aerospace & Defense

Employed in aircraft and military equipment for hydraulic systems and structural components.

Food & Pharmaceuticals

Stainless pipes for hygienic transport of food and pharmaceutical products, maintaining sterility.

Mining & Slurry Transport

Designed for transporting slurries and chemicals in mining, withstanding abrasion and harsh conditions.

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Seamless Pipes For Low And Medium Pressure Service

Seamless Pipes For Low And Medium Pressure Service