Gas Cylinder Steel Pipe - ASTM Certified Manufacturer | Kuaima Steel Group

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

Technical Specifications of Gas Cylinder Steel Pipe

Property	Parameter	Description
Product Name	Gas Cylinder Steel Pipe	Seamless steel pipe specifically designed for manufacturing gas cylinders and pressure vessels
Material Grade	34CrMo4 / 37Mn / 30CrMo	Equivalent to AISI 4130, JIS SCM430, GB 34CrMo4 for high-pressure gas containment
Standard Compliance	EN 10083 / GB/T 18248 / ISO 9809	Meets international standards for seamless steel tubes used in gas cylinder fabrication
Carbon (C)	0.30% - 0.37%	Provides adequate hardness and strength for pressure resistance
Manganese (Mn)	0.50% - 0.80%	Enhances tensile strength and hot working properties
Chromium (Cr)	0.90% - 1.20%	Improves hardenability and corrosion resistance under pressure
Molybdenum (Mo)	0.15% - 0.30%	Increases high-temperature strength and creep resistance
Silicon (Si)	0.17% - 0.37%	Acts as deoxidizer, improves strength
Phosphorus (P) / Sulfur (S)	≤ 0.025% / ≤ 0.020%	Strictly controlled to ensure weldability and toughness
Tensile Strength	≥ 900 MPa	Per EN 10083 / GB/T 18248 for quenched and tempered condition
Yield Strength	≥ 650 MPa	Minimum value ensuring structural integrity under high internal pressure
Elongation	≥ 14%	Measured on gauge length of 5.65√So, ensuring adequate ductility
Outer Diameter (OD)	89 mm - 406 mm	Customizable range to suit various gas cylinder capacities
Wall Thickness	4.0 mm - 40.0 mm	Engineered for working pressures up to 300 bar and above
Length	1000 mm - 12000 mm	Cut-to-length or random length available per customer requirement
Surface Finish	Hot-rolled / Normalized / Quenched & Tempered	Internal and external surfaces free from cracks, folds, and laminations; optional shot blasting
Application	CNG / LPG / Industrial Gas Cylinders / Hydrogen Storage	Widely used in compressed natural gas, liquefied petroleum gas, oxygen, nitrogen, and hydrogen cylinder manufacturing
Certification	ISO 9001 / PED 2014/68/EU / TPED / BV / SGS	Third-party inspection and mill test certificates provided with each shipment
Packaging	Bundle with steel strips, plastic caps on both ends	Seaworthy packaging with anti-rust oil coating for export protection
MOQ	5 Metric Tons	Smaller trial orders negotiable; lead time 20-35 days depending on specification

Gas Cylinder Steel Pipe - ASTM Certified Manufacturer | Kuaima Steel Group

Gas cylinder steel pipe is a critical component in the manufacture of high-pressure gas containment vessels, serving industries ranging from industrial gas distribution to medical oxygen supply and fire suppression systems. At Kuaima Steel Group, we produce premium grade gas cylinder steel pipes that meet stringent international standards, including ASTM A519, ASTM A106, and ISO 9809. With over a decade of mill-direct manufacturing experience, we supply seamless steel pipes specifically engineered for gas cylinder fabrication to clients across more than 50 countries worldwide. Our commitment to metallurgical precision and pressure-integrity testing ensures every pipe leaving our facility is ready for the most demanding applications.

What is Gas Cylinder Steel Pipe?

Gas cylinder steel pipe refers to seamless or hot-rolled steel tubing specifically designed and manufactured for the production of compressed gas cylinders. These pipes are produced from specialized steel grades—such as 34CrMo4, 30CrMo, and 4130—that offer exceptional yield strength, impact toughness, and resistance to hydrogen embrittlement. Unlike standard structural tubing, gas cylinder steel pipes undergo rigorous hydrostatic testing, ultrasonic inspection, and controlled heat treatment to ensure they can safely contain gases at pressures typically ranging from 150 bar to 300 bar.

Gas cylinder steel pipe manufacturer

Gas Cylinder Steel Pipe Technical Specifications

Our gas cylinder steel pipes are manufactured to precise dimensional and mechanical requirements that comply with global certification standards. Below is a detailed overview of our standard product range:

Gas cylinder steel pipe supplier

Parameter	Specification Range
Outside Diameter (OD)	140 mm – 406 mm
Wall Thickness	5.0 mm – 40.0 mm
Length	1,500 mm – 12,000 mm (custom lengths available)
Steel Grades	34CrMo4 (EN 10083), 30CrMo (GB/T 18248), AISI 4130, 37Mn
Tensile Strength	≥ 750 MPa (for 34CrMo4 after quenching and tempering)
Yield Strength	≥ 580 MPa minimum per EN 10083-3
Elongation	≥ 14% (A5)
Impact Toughness (Charpy V-notch)	≥ 40 J at -40°C
Hydrostatic Test Pressure	Up to 450 bar (per cylinder design specification)
Standards	ASTM A519, ISO 9809-1, EN 1964-1, GB/T 18248
Surface Finish	Hot-rolled, pickled, or machined OD/ID as required

Each batch undergoes 100% ultrasonic testing (UT) per ASTM E213, magnetic particle inspection (MPI), and full chemical analysis with optical emission spectrometry to verify composition tolerances within ±0.02% for critical alloying elements such as chromium and molybdenum.

Gas cylinder steel pipe factory

Applications of Gas Cylinder Steel Pipe

Gas cylinder steel pipes find extensive application across multiple high-stakes sectors. In the industrial gas sector, they serve as the primary material for oxygen, nitrogen, argon, and CO₂ cylinders operating at working pressures of 200 bar. The medical industry relies on these pipes for life-support oxygen cylinders that demand zero-defect manufacturing. In fire protection systems, gas cylinder pipes contain FM-200 and CO₂ extinguishing agents under sustained pressure. Additionally, the energy sector utilizes CNG (compressed natural gas) cylinders fabricated from high-strength seamless steel pipe for vehicular fuel storage at 250 bar operating pressure.

Why Choose Kuaima Steel Group for Gas Cylinder Steel Pipe?

Our manufacturing facility operates a fully integrated production line—from electric arc furnace steelmaking through piercing, hot rolling, heat treatment, and final inspection. We maintain ISO 9001:2015 and IATF 16949 certifications, and our products carry TÜV and BV third-party approval. Every gas cylinder steel pipe ships with a complete material test certificate (MTC) per EN 10204 Type 3.1, including chemical composition, mechanical properties, and non-destructive examination results.

Frequently Asked Questions

What is the MOQ?

Our minimum order quantity for gas cylinder steel pipe is 10 metric tons per size and grade. For trial orders or specialty dimensions, we can accommodate smaller quantities of 5 tons upon discussion with our sales team.

Do you provide material test certificates?

Yes, every shipment includes an EN 10204 Type 3.1 Mill Test Certificate detailing chemical analysis, mechanical test results, hydrostatic test records, and non-destructive examination reports. Third-party inspection by SGS, BV, or TÜV is available upon request.

What is the typical delivery time?

Standard gas cylinder steel pipe sizes in stock grades ship within 15–20 business days. Custom specifications, including non-standard OD/wall thickness combinations or special heat treatment cycles, typically require 30–45 days from order confirmation.

Can you cut to custom sizes?

Absolutely. We offer precision cutting to custom lengths with a tolerance of ±2 mm, along with beveling, chamfering, and end-facing services to meet your cylinder manufacturing requirements directly upon delivery.

Get a Competitive Quote for Gas Cylinder Steel Pipe

Whether you need a reliable supply of 34CrMo4 seamless pipe for CNG cylinder production or 37Mn tubes for standard industrial gas bottles, Kuaima Steel Group delivers mill-direct rates with full certification and global logistics support. Contact our technical sales team today with your specifications—including steel grade, dimensions, quantity, and required standards—and receive a detailed quotation within 24 hours. Partner with a certified manufacturer that understands the zero-tolerance quality demands of gas cylinder steel pipe production.

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

Simon Cartwright

United Kingdom

verified purchases

2025-02-15

Initial Surface Issue Resolved Satisfactorily
Ordered 15 tons of 34CrMo4 pipe (159mm OD, 7.5mm WT) for oxygen cylinder production. Upon arrival, we found approximately 8% of pipes had minor surface scale that exceeded our internal acceptance criteria for machined OD finish. Raised the issue with Kuaima's quality team and they responded within 24 hours, offered a credit note, and shipped replacements within two weeks at no charge. The replacement pipes were perfect. Material properties and documentation were fine throughout. Appreciated the responsive resolution.

Robert Callahan

United States

verified purchases

2025-03-09

Competitive Pricing on 30CrMo Grade - Solid Product
We tested Kuaima as an alternative source for 30CrMo pipe, 267mm OD x 14mm WT, for high-pressure nitrogen cylinders per ASTM A519. Ordered a trial quantity of 10 tons. The material passed our internal quality checks and third-party lab verification. Mechanical properties were within spec. Pricing was very competitive for mill-direct supply. Delivery took 25 days to Houston which was reasonable. Planning a larger follow-up order for Q3.

David Thornton

United Kingdom

verified purchases

2025-03-31

Good Value for 4130 Pipe - Minor Paperwork Delay
Purchased 20 tons of AISI 4130 seamless pipe (194mm OD, 10mm WT) for CO₂ cylinder fabrication at 200 bar working pressure. Material quality was solid — passed all our incoming inspection checks including hardness and microstructure review. Price was roughly 12-15% below what we were paying our previous European supplier. Only minor issue was a slight delay in receiving the final MTC documents, but the pipes themselves arrived on time in 20 days. Good value overall.

Ahmed Al-Rashidi

UAE

verified purchases

2025-04-22

Third Order This Year - Consistently Good Quality
This is our third purchase from Kuaima in 2025. We buy 37Mn grade seamless pipe for standard argon and nitrogen cylinders — 178mm OD, 6.5mm wall, lengths of 1,800mm. Each order has been around 15 tons and quality has been consistent across all batches. Hydrostatic test records show clean passes at 300 bar. Their logistics team handles shipping to Jebel Ali efficiently. Pricing remains competitive compared to European mills. Solid long-term partnership.

Stefan Krüger

Germany

verified purchases

2025-05-15

Meets EN 10083-3 Requirements Precisely
Ordered 34CrMo4 pipe to EN 1964-1 for medical oxygen cylinder production — 140mm OD, 6.8mm WT, cut to 1,650mm lengths with beveled ends. We had TÜV witness testing at the mill and all mechanical properties exceeded minimum requirements. Yield strength came in at 612 MPa, elongation at 16.2%. The heat treatment documentation was detailed and traceable. Delivery to Hamburg was 32 days for our custom specification, which was acceptable. Will continue ordering.

Michael Brennan

United States

verified purchases

2025-06-06

Reliable Supply for FM-200 Suppression Cylinders
We use Kuaima's AISI 4130 seamless pipe (168mm OD, 12mm wall) for manufacturing FM-200 fire suppression cylinders. Ordered 25 tons and received full documentation including UT reports per ASTM E213 and MPI results. Tensile strength tested above 780 MPa after quench and temper. The precision cutting service with ±2mm tolerance saved us significant machining time. This is our go-to supplier for pressure vessel grade tubing now.

Dr. Rajesh Menon

India

verified purchases

2025-06-28

ISO 9809-1 Compliant Tubes - Passed BV Inspection
Sourced 30CrMo grade pipe per GB/T 18248 standard, 232mm OD x 7.2mm WT, for industrial oxygen cylinders rated at 200 bar. We requested third-party BV inspection at the mill and Kuaima arranged it without any hassle. Chemical composition was spot-on — Cr and Mo within tight tolerances. Surface finish after pickling was clean with no pitting. Delivery to Nhava Sheva port took about 22 days. Very professional technical sales team who understood our cylinder fabrication requirements.

James Whitfield

Australia

verified purchases

2025-07-13

Excellent 34CrMo4 Pipe for CNG Cylinder Production
We ordered 45 metric tons of 34CrMo4 seamless pipe, OD 219mm x 8.5mm wall thickness, for our CNG cylinder line operating at 250 bar. Every pipe came with a full EN 10204 Type 3.1 MTC and the Charpy impact values at -40°C consistently exceeded 45 J. Ultrasonic test reports were thorough. Kuaima delivered within 18 business days to Melbourne. We've run over 3,000 cylinders from this batch with zero rejects during hydrostatic testing. Outstanding metallurgical consistency.