Seamless Steel Hydrogen Gas Cylinders (Type I)
Industrial-grade Type I seamless steel cylinders engineered for high-pressure hydrogen gas containment, transport, and cascade storage systems. Forged from controlled-composition chrome-molybdenum alloy steel and built in accordance with DOT-3AA and ISO 11120 standards.
Technical Specifications & Sizing
|
Model |
Water Capacity (L) |
Working Pressure (bar) |
Test Pressure (bar) |
Outer Diameter (mm) |
Nominal Length (mm) |
Approx. Weight (kg) |
Thread Specification |
|
SHC-40 |
40 |
200 |
300 |
232 |
1,350 |
48 |
PZ27.8 / W21.8 |
|
SHC-50 |
50 |
200 |
300 |
232 |
1,650 |
58 |
PZ27.8 / W21.8 |
|
SHC-68 |
68 |
200 |
300 |
267 |
1,450 |
72 |
PZ27.8 / W21.8 |
|
SHC-80 |
80 |
250 |
375 |
406 |
950 |
95 |
PZ30 / W28.8 |
Material & Metallurgical Control
Hydrogen containment requires strict metallurgical limitations to prevent hydrogen-induced cracking (HIC) and material fatigue.
Alloy Grade: Forged from 34CrMo4 quenched and tempered steel.
Trace Element Limits: Sulfur (S <= 0.005%) and phosphorus (P <= 0.010%) contents are restricted during ladle refining to minimize non-metallic inclusions.
Tensile Strength Threshold: The ultimate tensile strength is strictly controlled below 950 MPa in compliance with ISO 11114-4 material compatibility criteria for hydrogen service.
Microstructure: Verified tempered sorbite structure ensuring uniform grain size and stress distribution across cyclic pressure loads.
Manufacturing & Inspection Workflow
Hot Piercing: Steel billets heated to 1150 degrees C undergo rotary piercing to produce a seamless hollow shell without longitudinal weld lines.
Cold Drawing & Necking: Multi-stage mechanical shaping maintains wall thickness tolerance within plus or minus 0.2 mm and forms uniform hemispherical cylinder bases.
Heat Treatment: Continuous automated quenching and tempering line providing uniform mechanical properties throughout the cylinder body.
Hydrostatic Testing: 100% water jacket test performed at 1.5x working pressure with a minimum hold time of 30 seconds to verify volumetric expansion limits.
Non-Destructive Testing (NDT): Ultrasonic testing (UT) and magnetic particle inspection (MPI) executed on 100% of production output to detect internal and surface flaws.
Regulatory Compliance & Certifications
North America: DOT-3AA / DOT-3AAX compliant.
International / Europe: ISO 11120 (for seamless steel tubes and large cylinders) and TPED (2010/35/EU) conformity.
Verification: Independent third-party inspection reports (TÜV, SGS, or BV) issued per production lot.
Typical Application Scenarios
Hydrogen Refueling Stations (HRS): Stationary ground storage banks operating at 350 bar and 700 bar cascade intervals.
Mobile Gas Cascades: Skid-mounted bundle configurations integrated into tube trailers for high-volume logistics.
Industrial Chemical Processing: High-purity hydrogen supply lines for semiconductor manufacturing and metallurgical reduction.
Procurement & RFQ Parameters
Include the following operational parameters when requesting a technical proposal and commercial quotation:
Regulatory Standard: DOT, ISO 11120, or TPED.
Pressure Ratings: Working pressure and test pressure.
Dimensional Constraints: Maximum outer diameter or water capacity.
Valve & Port Configuration: CGA 350, DIN 477, or custom thread requirements.
Project Volume & Delivery Port.
Frequently Asked Questions
Q: How is hydrogen embrittlement prevented in these cylinders?
A: By restricting sulfur and phosphorus impurities, maintaining clean steel microstructures, and enforcing an ultimate tensile strength ceiling below 950 MPa in accordance with ISO 11114-4 standards.
Q: Are these cylinders suitable for multi-cylinder cascade skids?
A: Yes. These Type I cylinders feature high structural rigidity, making them standard components for stationary ground storage manifolds and mobile tube trailer skids.
Q: What is the mandatory re-test cycle for DOT-compliant hydrogen cylinders?
A: Under North American regulations, seamless steel hydrogen transport cylinders typically require hydrostatic re-testing every 5 to 10 years, depending on operating conditions and local jurisdictional rules.
Q: What documentation accompanies each shipment?
A: Each delivery includes individual serial number traceability, material mill test certificates (MTRs), hydrostatic test logs, and third-party inspection witness reports issued by agencies such as TÜV or BV.
Hot Tags: steel hydrogen gas cylinder, China steel hydrogen gas cylinder manufacturers, suppliers, factory
