Hydrogen Gas Filling Cylinder

Seamless Steel & Composite Pressure Vessels for Hydrogen Storage, Cascade Systems, and Refueling Stations

Mitigating hydrogen embrittlement requires strict metallurgical control from raw material input to final heat treatment.

Steel Composition Control: Manufactured using fine-grain, vacuum-degassed 34CrMo4 alloy steel with tightly controlled sulfur (<= 0.005%) and phosphorus (<= 0.010%) limits to minimize non-metallic inclusions and prevent intergranular cracking under high-pressure gas exposure.

Microstructure: Fully tempered martensitic microstructure achieved through automated vertical quenching furnaces, ensuring optimal yield-to-tensile strength ratios (typically 0.85 to 0.90) and superior fracture toughness.

Internal Surface Passivation: Mechanical honing followed by chemical cleaning and nitrogen purging to achieve a surface roughness of Ra <= 1.6 um, eliminating particulate shedding that could poison downstream fuel cell catalysts.

Hot Piercing & Ironing
Billet heating is performed in computer-controlled rotary hearth furnaces. Hot piercing and subsequent multi-stage mandrel redrawing ensure uniform wall thickness distribution, eliminating eccentricities that cause localized stress concentrations.

Heat Treatment
Quenching and tempering are executed in continuous roller-hearth furnaces with closed-loop temperature logging. This guarantees consistent mechanical properties across the entire length of the cylinder body.

Mandatory NDT & Destructive Testing
Every production batch undergoes rigorous verification according to international pressure vessel codes:
• Ultrasonic Testing (UT): 100% automated volumetric inspection for internal lamination and inclusion defects.
• Hydrostatic Pressure Testing: Conducted at 1.5 times the working pressure for a minimum holding time of 30 seconds to verify elastic deformation limits.
• Destructive Batch Testing: One cylinder per heat treatment lot is subjected to tensile testing, Charpy V-notch impact testing at -40 deg C, and burst pressure testing (minimum burst-to-working pressure ratio of 2.25:1 for industrial steel cylinders).

To clear international customs and satisfy local AHJ (Authority Having Jurisdiction) inspections across global markets, our cylinders are manufactured under quality systems audited and certified by independent notified bodies:

European Union: PED 2014/68/EU and TPED (Transportable Pressure Equipment Directive) with Pi-marking.

North America: ASME Section VIII, Division 3 compliance capability, alongside DOT (Department of Transportation) special permit support for seamless steel and composite tube configurations.

International Standards: ISO 11120 (Stationary steel tubes), ISO 19880-3 (Gaseous hydrogen refueling stations), and ISO 9001:2015 / IATF 16949 certified manufacturing facilities.

Hydrogen Refueling Stations (HRS): High, medium, and low-pressure storage banks for fast-fill cascade systems (35MPa and 70MPa infrastructure).

Tube Trailers & Mobile Skids: High-capacity, lightweight steel or composite cylinders integrated into over-the-road gas distribution modules.

Industrial Gas Plants: Bulk storage manifolds for high-purity hydrogen distribution to electronics manufacturing and chemical synthesis plants.

When specifying hydrogen storage cylinders for capital projects, engineering teams must evaluate interface compatibility and delivery timelines:

Define Operating Profiles: Confirm your maximum allowable working pressure (MAWP), daily fill/discharge frequency, and ambient design temperature range (e.g., -40 deg C to +65 deg C).

Specify Regional Code Requirements: State whether your project falls under ASME, PED/TPED, or DOT jurisdictions to ensure proper engineering design review and third-party inspection alignment.

Confirm Connection Geometry: Verify neck thread standards (ISO, CGA, or GB) and valve mounting requirements to match your manifold piping.

Request Technical Dossier: Contact our engineering office for complete 2D/3D CAD models, third-party test certificates, and material test reports (MTRs) tailored to your project region.

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