Steel Pipe for Gas Cylinder is a seamless steel tube designed for manufacturing high-pressure gas cylinders used in industrial, automotive CNG, and medical applications. Compliant with standards like GB 18248-2000, JIS G3429, and EN 10297-1, these seamless gas cylinder pipes offer exceptional strength, uniform wall thickness, and pressure resistance for safe gas storage and transport.

Crafted from high-strength steel grades such as 37Mn, 34Mn2V, 30CrMo, and 35CrMo, these high-pressure gas cylinder tubes are produced via hot-rolling or cold-drawing processes to ensure precise dimensions and smooth surfaces. Available in outer diameters from 177.8 mm to 406.4 mm and wall thicknesses from 4.3 mm to 7.0 mm, they are optimized for lightweight, thin-walled designs with high productivity. The seamless structure eliminates weld-related weaknesses, ensuring reliability under pressures up to 300 bar.

CNG cylinder pipes undergo rigorous testing, including 100% ultrasonic testing (UT), tensile testing, and chemical composition analysis, to ensure defect-free material and compliance with standards. With tensile strengths ranging from 745 MPa (37Mn) to 880 MPa (35CrMo), these tubes resist deformation and cracking under high pressure. Surface treatments like oil coating or phosphating enhance industrial gas cylinder pipe corrosion resistance, making them suitable for harsh environments in automotive, industrial, and medical settings.

Unlike welded pipes, seamless gas cylinder pipes provide superior strength and safety, critical for applications like vehicle-mounted CNG cylinders and medical oxygen cylinders. These tubes are customizable to meet specific requirements, such as thin-walled designs for lightweight automotive cylinders or robust structures for industrial gas storage. Their high yield and uniform wall thickness ensure cost-effectiveness for manufacturers.

By addressing challenges like high-pressure containment, corrosion, and material fatigue, steel pipes for gas cylinders deliver safe, reliable, and efficient solutions for gas storage and transportation. From industrial processes to alternative fuel vehicles, these tubes ensure performance and compliance with stringent safety standards.

Seamless Steel Tubes

Standards and Specifications

Seamless steel tubes for gas cylinders and mechanical applications adhere to rigorous standards like GB, ASTM, JIS, and ISO, ensuring safety, strength, and reliability in high-pressure environments.

Standards such as GB 18248 and GB 28884 govern seamless steel tubes for standard and large-volume gas cylinders, while ASTM A519 specifies carbon and alloy steel mechanical tubing for diverse industrial uses.

JIS G3429 addresses high-pressure gas cylinder tubes, and BS EN ISO 11120 outlines design and testing for refillable seamless tubes with water capacities of 150L to 3000L, ensuring compliance with global safety requirements.

Seamless Steel

Materials for Gas Cylinder Pipes

Seamless steel tubes for gas cylinders are crafted from high-strength steel grades like 37Mn, 34CrMo4, and 4130X, ensuring durability and safety under high-pressure conditions.

Common grades include 37Mn, 34Mn2V, and 30CrMo, offering excellent mechanical properties for standard and high-pressure gas cylinders compliant with standards like GB 18248.

Advanced alloys such as 35CrMo, 34CrMo4 (EN10297-1), and 4130X (equivalent to 30CrMoE) provide superior strength and toughness for large-volume and specialized cylinders per GB 28884 and ISO 11120.

Chemical Composition of GB 18248-2000 Grades 37Mn, 34Mn2V, 35CrMo
Grade	C (%)	Si (%)	Mn (%)	P (% max)	S (% max)	Cr (% max)	Mo (% max)
37Mn	0.34–0.40	0.10–0.30	1.35–1.65	0.030	0.030	0.30	-
34Mn2V	0.30–0.37	0.17–0.37	1.40–1.75	0.030	0.030	-	-
35CrMo	0.32–0.40	0.17–0.37	0.40–0.70	0.030	0.030	0.80–1.10	0.15–0.25

The chemical composition ensures high strength, toughness, and pressure resistance for gas cylinder applications.

Mechanical Properties of GB 18248-2000 Grades 37Mn, 34Mn2V, 35CrMo
Grade	Tensile Strength (MPa min)	Yield Strength (MPa min)	Elongation (% min)
37Mn	745	530	12
34Mn2V	745	530	12
35CrMo	880	590	12

These properties ensure durability and safety under high-pressure conditions in gas cylinder applications.

Seamless Steel Pipes for Gas Cylinders
Usage	Specification No.	Steel Grade
Seamless Steel Pipe used for Gas Cylinder	GB/T 18248	37Mn, 34CrMo4, 35CrMo, 30CrMnSiA, 30CrMo
Fire-fighting gas cylinders, industrial gas cylinders, vehicle gas cylinders	JIS G3429	37Mn, 34Mn2V, 30CrMo, 35CrMo, STH11, STH12, STH21, STH22, or others
Seamless Steel Pipe used for Gas Cylinder with Large Volume	GB/T 28884	30CrMoE（4130X）, 32CrMoE（4142）

Products can be ordered in accordance with the client’s requirements.

Chemical Composition of 30CrMoE Steel Grade (wt%)
Grade	Specification	C	Si	Mn	P	S	Cr	Mo	Ni	Cu
30CrMoE	1	0.25-0.35	0.15-0.35	0.4-0.9	≤0.02	≤0.01	0.8-1.1	0.15-0.25	≤0.3	≤0.2
30CrMoE	2	0.26-0.34	0.17-0.37	0.4-0.7	≤0.02	≤0.01	0.8-1.1	0.15-0.25	≤0.3	≤0.2

Mechanical Properties of 30CrMoE Steel
Standard	T.S/MPa	Y.S/MPa	E/A %	Yield Ratio	Hardness/HBW	-40℃ Impact Test/J
30CrMoE	≥720	≥485	≥20	≤86	≤269	≥32

Key Benefits

High Strength

Withstands pressures up to 300 bar for safe gas storage.

Corrosion Resistance

Oil coating or phosphating protects against environmental damage.

Seamless Design

Eliminates weld seams for enhanced safety and reliability.

Lightweight

Thin-walled designs reduce weight for automotive cylinders.

Customizable

Tailored dimensions and grades for specific applications.

Standards Compliance

Meets GB 18248, JIS G3429, and EN 10297-1 standards.

Seamless steel pipes used to manufacture high-pressure gas cylinders for industrial, automotive, and medical applications.

High-strength steel grades like 37Mn, 34Mn2V, 30CrMo, and 35CrMo for pressure resistance and durability.

- 37Mn: C 0.34–0.40%, Si 0.10–0.30%, Mn 1.35–1.65%, P ≤0.030%, S ≤0.030%
- 34Mn2V: C 0.30–0.37%, Si 0.17–0.37%, Mn 1.40–1.75%, P ≤0.030%, S ≤0.030%
- 35CrMo: C 0.32–0.40%, Si 0.17–0.37%, Mn 0.40–0.70%, P ≤0.030%, S ≤0.030%, Cr 0.80–1.10%, Mo 0.15–0.25%

- 37Mn: Tensile ≥745 MPa, Yield ≥530 MPa, Elongation ≥12%
- 34Mn2V: Tensile ≥745 MPa, Yield ≥530 MPa, Elongation ≥12%
- 35CrMo: Tensile ≥880 MPa, Yield ≥590 MPa, Elongation ≥12%

Outer diameters from 177.8 mm to 406.4 mm, wall thicknesses from 4.3 mm to 7.0 mm, customizable per requirements.

Ultrasonic, tensile, chemical composition, and hydrostatic tests ensure defect-free material and standard compliance.

Industrial gas cylinders, automotive CNG cylinders, medical gas cylinders, firefighting cylinders, and specialty gas storage.

Oil coating, phosphating, or other surface treatments protect against environmental corrosion.

Seamless pipes offer uniform strength and no weld seams, ensuring safety under high pressure.

GB 18248-2000, JIS G3429, EN 10297-1, and other standards upon consultation.

You Can Also Search Steel Pipe for Gas Cylinder by

Explore steel pipes for gas cylinders with targeted long-tail keywords for specifications, applications, and materials.

Standards and Specifications

• Seamless steel pipe for gas cylinder GB 18248
• High-pressure gas cylinder tube standards
• CNG cylinder pipe specifications
• Industrial gas cylinder pipe JIS G3429

Applications

• Seamless gas cylinder pipe for CNG vehicles
• Industrial gas cylinder pipe manufacturing
• Medical gas cylinder tube applications
• Firefighting cylinder seamless pipes

Material and Grades

• 37Mn seamless gas cylinder pipe
• 34Mn2V high-pressure cylinder tube
• 35CrMo seamless steel gas cylinder pipe
• 30CrMo gas cylinder steel pipe

Manufacturing and Testing

• Seamless gas cylinder pipe manufacturing process
• High-pressure cylinder tube testing standards
• CNG cylinder pipe quality assurance
• Seamless steel pipe for gas cylinder production

Note: Steel pipes for gas cylinders meet international standards, ensuring safety 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.

Related products

Steel Pipe for Gas Cylinder

Steel Pipe for Gas Cylinder

Standards and Specifications

Materials for Gas Cylinder Pipes