Seamless High-pressure Steel Cylinder

Ronghai seamless high‑pressure steel cylinders core gas‑equipment series. Seamless alloy monoblock, 1.5× hydro‑tested, traceable stamping. 1.5‑150L, multi‑specs, 3 materials up to 230 bar. Compliant with GB/T 5099, ISO 9809, EN 1964, DOT, IS 7285. For gas storage, welding‑cutting, filling stations. Custom valves, painting & branding.

Seamless High-pressure Steel Cylinder

☑ OEM custom seamless alloy steel cylinder

☑ Custom capacities from 1.5L to 150L

☑ Flexible valves, colors & specifications

☑ Full certification & factory-direct support

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Product Details

Product Description

Comprehensive product specifications, features, and technical information to help you make the right choice.

 ItemContent
Product NameRONGHAI Seamless High Pressure Gas Cylinder (Empty)
English alternative namesSeamless Steel Gas Cylinder | High Pressure Seamless Cylinder | Industrial Gas Cylinder | Oxygen / Argon / Nitrogen / CO2 Cylinder
Product Positioning2–150L full capacity coverage, factory-direct supply, TPED / ISO9809 / DOT certificates available on request
Bottle material37Mn / 34CrMo4 Cr-Mo seamless alloy steel (certified to GB/T 5099 & ISO 9809)
|Manufacturing ProcessBillet cutting → induction heating → reverse extrusion → drawing → closing → heat treatment (quench & temper) → shot blasting → neck threading → hydrostatic test → leak test → coating → inspection
Threaded bottle neckPZ27.8 / 25E / G5/8" / CGA540 / CGA580 / W21.8 (configured per destination market & gas service)
Surface TreatmentInternal & external shot blasting + powder coating / painting; standard blue/black/grey/silver; RAL color customizable
Cap / Protective RingTulip cap / common cap / semi-circle guard / plastic handle (combinable)
Internal TreatmentShot-blasted or phosphated, meets high-purity / electronic grade gas cleanliness
Water Capacity2 – 150 L (28 standard capacity steps: small / medium / large / extra-large)
Working Pressure15 / 16.7 / 17 / 20 / 23 / 25 / 30 MPa (150 / 166.7 / 170 / 200 / 230 / 250 / 300 bar)
Test Pressure22.5 / 25.5 / 30 / 34.5 / 37.5 / 45 MPa (1.5 x working pressure)
 Hydrostatic Test100% per-unit hydrostatic test per-unit leak test (water immersion / helium leak test optional), test report issued
Design Wall Thickness2.8 – 8.5 mm (varies by capacity & pressure rating, see model table)
Gas ServiceOxygen / Nitrogen / Argon / CO2 / Helium / Hydrogen / Nitrous Oxide / Mixed gases / Specialty gases
Service Life15–20 years (per applicable standard & gas service, subject to periodic inspection)
Periodic inspection cycleEvery 3–5 years (per destination country regulations)
RefillableYes (refillable, non-disposable)
Valve TypePressure-retaining valve / QF-2 / QF-30 / CGA series / valve with safety relief device (brand specified)
Valve MaterialBrass / Stainless steel (selected by gas compatibility)
Optional accessoriesCap, guard, handle, cylinder trolley, regulator, valve guard, strap
enforce standardsGB/T 5099.1 / GB/T 5099.3, ISO 9809-1 / ISO 9809-3, EN ISO 9809-1, DOT 3AA
Export certificationTPED π-mark / CE-PED / TÜV / BV / SGS / DOT (US) 
System CertificationISO 9001 QMS 
DocumentationMaterial certificate, per-unit hydrostatic test report, batch inspection report, conformity certificate, third-party inspection (SGS/BV/TÜV)
OEM / ODMSupported (factory-direct, one-stop from design to shipment)
Customization ScopeCapacity, pressure rating, neck thread, valve model, color/RAL, logo printing or stamping, packaging, shipping marks
Sample PolicySamples dispatched in 7–15 days; sample fee deductible from bulk order
Buyer TypeGas filling plants, industrial gas distributors, welding equipment suppliers, medical gas suppliers, fire equipment suppliers, EPC contractors
Export PackingWooden pallet + PVC stretch film + strapping; fumigation / heat-treatment certificate with IPPC mark available
DG PackingValve protection caps fitted, layered separation & anti-slip securing, Class 2 dangerous goods placard and UN number on outer packing
  • Product Features:

  • Full-range 1.5-150L - There are a total of 442 specifications in volume range, with outer diameters ranging from 108 to 356mm, covering everything from small portable to centralized storage platforms.

  • 37Mn / 34CrMo 4/30CrMo material options - Manganese steel 150 bar cost performance range; Chromium-molybdenum alloy steel 170-230 bar high-pressure main force; Customized export of 30CrMo is available.

  • Working pressures 150/166.7/170/200/210/230 bar, the test pressure was 1.5 times the working pressure (225/250/255/300/315/345 bar).

  • Manufactured to GB/T 5099.1/5099.3, ISO 9809-1/9809-3 -- the steel stamp on the bottle mouth is complete and traceable: Manufacturer code, factory serial number, working pressure, volume/net weight, reference standard, material grade, production month and year, hydrostatic test date and pressure, medium UN number, certification mark.

  • Deep-drawn & Heat-treated seamless construction - Steel plate Deep drawing, finishing and heat treatment are formed in one piece, with no weld structure.

  • Multi-gas service ready - Compatible with the storage, welding and cutting, distribution at filling stations and centralized gas supply of industrial gases such as oxygen, argon, carbon dioxide and nitrogen.

  • Certification marks per destination -- The destination country certifications such as DOT-3AA/ISO 9809 shall be marked after checking the actual certificate held against the medium approval documents.


Why You Should Choose Ronghai?

01

Global Logistics

Our own logistics network delivers door-to-door from regional warehouses in EU, US and Australia.

02

Quality Assurance

ISO 9001 certified with full-batch factory inspection for standard, stable and reliable products.

03

Production Capacity

Complete production lines and testing equipment across our modern manufacturing base.

04

R&D & Engineering

In-house design and engineering team launches new products and specifications quickly.

Ronghai vs Other Suppliers

Why Choose Ronghai OEM Cream Chargers?

From certification and quality control to customization and after-sales — factory-direct supply changes everything compared with ordinary suppliers.

Factory Direct · Fully Certified
  • ✓
    Verified International Certifications

    Full suite including ISO 11118, ISO 9001, DOT, TPED/PED and CCS, with certificate documents shipped with every order.

  • ✓
    100% Batch Inspection

    Every cylinder is pressure-tested and leak-checked before shipping — full batch inspection, not random sampling.

  • ✓
    Food-Grade Materials

    Food-grade steel & aluminum with traceable sources, meeting international hygiene and safety standards.

  • ✓
    Flexible OEM / ODM Customization

    Custom branding, body colors, flavor labels and packaging — small trial orders welcome.

  • ✓
    Stable Capacity & Lead Time

    Integrated factory production from samples to full container loads, with no gaps during peak seasons.

  • ✓
    Global After-Sales & Documentation

    SDS, COA, certificates of origin and other export documents, with responsive after-sales support.

  • ✓
    One-Stop Procurement

    Cream chargers, steel cylinders, medical oxygen cylinders and accessories from a single supplier.

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VS
Ordinary · Inconsistent
  • ✕
    Missing or Unverifiable Certifications

    Missing, expired or hard-to-verify certificates — compliance risk falls on the buyer.

  • ✕
    Sampling Instead of Full Inspection

    Random or no inspection at all — inconsistent pressure and sealing within a single batch.

  • ✕
    Unknown Material Quality

    Unclear material grades and untraceable sources create potential safety and hygiene risks.

  • ✕
    Limited Customization, High MOQ

    Standard products only, with limited colors, labels and packaging, and higher minimum orders.

  • ✕
    Unstable Capacity & Delays

    Stock-outs in peak season and delayed delivery disrupt your market supply plan.

  • ✕
    Slow After-Sales & Missing Documents

    Incomplete export documents and slow responses make issues harder to resolve.

  • ✕
    Multi-Supplier Coordination

    Cylinders and accessories from different vendors mean extra coordination in sourcing, QC and logistics.

Company Strength

Real Questions Buyers Ask

Browse frequently asked questions — product specs, OEM customization, wholesale terms, export logistics and compliance.

Can I order products under my own brand?

Absolutely. Private label and OEM manufacturing are core services of ours. We can print your logo, apply your packaging artwork and even customize cylinder colors, caps and flavor cards to match your brand identity.

What is the MOQ for a custom OEM order?

For fully customized Cream charger packaging, the MOQ starts at one 20-foot container, with mixed SKUs allowed. For large cylinders, the MOQ is typically 500 units per size for custom labels and one 20-foot container for fully custom-printed cartons. Your sales manager will confirm the exact figures for your project.

Which parts of the product can be customized?
  • Logo and artwork printing on chargers and cylinders
  • Gift box and master carton design
  • Cylinder body color, cap and nozzle color
  • Flavor selection and multilingual manuals
  • Barcode/EAN labels and pallet marking
What artwork files do you need from us?

Please provide vector files in AI, EPS or print-ready PDF format in CMYK with all text converted to outlines. We supply the exact dieline templates and safe-zone guides so your designer can set the artwork up correctly.

Is there a minimum or maximum order quantity?

Regular wholesale orders start at 100 cartons per SKU, and there is no upper limit. Container orders (20ft or 40ft HQ) receive the best unit pricing, and mixed models or flavors are welcome.

Do you offer special pricing for distributors?

Yes. Pricing is tiered by order volume and partnership level, and qualified distributors receive annual rebates, marketing support and regional protection. Send us your target quantities and we will quote within 24 hours.

What payment terms do you accept?

For bulk production we accept T/T with a 30% deposit and 70% balance against the bill of lading copy, or an irrevocable L/C at sight. Sample and small orders can be paid via PayPal, Western Union or trade-assurance platforms.

Can I request samples before placing a bulk order?

Yes. Stocked samples are dispatched within 3 working days and usually arrive in 5 to 7 days by express. Sample and freight charges are refundable once the first bulk order is confirmed.

How long will it take to receive my bulk order?

For CIF terms, due to commodity inspection by customs, it usually takes 7 to 15 days to ship to your freight forwarder after production is completed. Total door-to-door transit is typically 25 to 40 days depending on the destination port.

Which shipping methods are available?

Bulk orders ship by sea as FCL or LCL; urgent small orders and samples can go by international express (DHL, FedEx, UPS). Rail transport is also available for certain European and Central Asian destinations.

How is nitrous oxide classified for transport?

N2O ships under UN 1070 as a Class 2.2 non-flammable, non-toxic compressed gas, with the applicable oxidizer (5.1) subsidiary handling requirements. All cartons, cylinders and pallets carry the correct dangerous-goods marks and labels.

Do you provide dangerous-goods shipping documents?

Yes. We supply the full document package, including SDS/MSDS, dangerous-goods declaration, IMO declaration, packing list, commercial invoice, certificate of origin and bill of lading, through qualified dangerous-goods forwarders.

What certifications do Ronghai products hold?

Our factories operate under ISO 9001 quality management and HACCP/FSSC 22000 food-safety systems, and the gas and pressure containers are produced under TPED and applicable international transport requirements. Full certificates are available from your sales manager.

Is your nitrous oxide genuinely food grade?

Yes. The gas is certified food additive E942 with a minimum purity of 99.95%, produced and filled under food-safety controls. Every production batch is tested for purity and moisture and comes with a batch COA.

Which documents can you provide for customs clearance?
  • Certificate of origin and commercial invoice
  • Packing list and bill of lading
  • SDS/MSDS and batch COA
  • Food-grade statement
  • Health/free-sale and third-party inspection certificates where required
Are the steel cylinders certified for pressurized transport?

Yes. Cylinders are manufactured under the EU TPED framework for transportable pressure equipment and meet the applicable UN cylinder requirements; U.S.-bound shipments follow the relevant DOT transport provisions.

This comparison highlights only key differences — contact us for the full comparison sheet.

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Our Solution

Complete Customized Solutions

From product planning to global delivery, our in-house design and engineering team has produced countless great solutions for customers across food service, beverage and medical industries.

  • ✓Planning proposal: product planning proposal
  • ✓Trial production: until the customer is convinced
  • ✓Evaluation: confirmation of samples, colors and packaging
  • ✓Quotation, Order, Delivery