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Galvanized Round Steel Pipe & Tubing | Hot-Dip, Sizes & Custom Supply
Xi'an Dongmeng Group Co., Ltd. supplies galvanized round steel pipe and tubing for construction, infrastructure, industrial fabrication, agricultural structures, fencing, and suitable piping applications. We provide sourcing and customization options for hot-dip galvanized and pre-galvanized round tubes, with specifications selected according to the required mechanical properties, corrosion protection, dimensional tolerances, and operating conditions.
Our galvanized round steel pipes are available in a range of outside diameters, wall thicknesses, lengths, and end configurations. Depending on project requirements, we can supply products based on ASTM A53, ASTM A500, EN 10255, EN 10219, and applicable coating specifications.
For distributors, contractors, fabricators, OEM manufacturers, and engineering procurement teams, we support technical specification review, dimensional verification, cutting, end preparation, inspection coordination, and export packaging.
What Is Galvanized Round Steel Pipe?
Galvanized round steel pipe is a circular carbon steel pipe or tube protected by a zinc coating to reduce atmospheric corrosion.
The zinc coating provides two forms of corrosion protection. First, it acts as a physical barrier between the steel substrate and the environment. Second, zinc offers sacrificial protection to exposed steel in limited damaged areas, helping delay the formation of red rust.
The effectiveness of galvanized steel depends on several factors, including:
Base steel composition and manufacturing method
Zinc coating thickness and continuity
Galvanizing process
Exposure to moisture, chlorides, and industrial pollutants
Mechanical damage and fabrication after galvanizing
Inspection, maintenance, and operating conditions
Galvanized round pipes are commonly selected when a combination of structural performance, corrosion resistance, fabrication flexibility, and cost efficiency is required.
However, galvanized coating alone does not establish suitability for pressure service, potable water, gas transmission, or other regulated applications. These uses require additional verification against the applicable product specifications, design codes, and local regulations.
Galvanized Round Steel Pipe Dimensions and Size Chart
Galvanized round steel pipes may be ordered using Nominal Pipe Size (NPS), Nominal Diameter (DN), or actual outside diameter and wall thickness.
For NPS-designated steel pipe, the nominal size is not the actual measured outside diameter. The outside diameter and wall thickness should be verified against the applicable dimensional standard.
Standard Galvanized Round Pipe Sizes
The following table provides common dimensions based on the ASME B36.10M pipe dimensional system.
| NPS | DN | Outside Diameter (mm) | Outside Diameter (in) | SCH 40 WT (mm) | SCH 80 WT (mm) |
|---|---|---|---|---|---|
| 1/2" | DN15 | 21.3 | 0.840 | 2.77 | 3.73 |
| 3/4" | DN20 | 26.7 | 1.050 | 2.87 | 3.91 |
| 1" | DN25 | 33.4 | 1.315 | 3.38 | 4.55 |
| 1-1/4" | DN32 | 42.2 | 1.660 | 3.56 | 4.85 |
| 1-1/2" | DN40 | 48.3 | 1.900 | 3.68 | 5.08 |
| 2" | DN50 | 60.3 | 2.375 | 3.91 | 5.54 |
| 2-1/2" | DN65 | 73.0 | 2.875 | 5.16 | 7.01 |
| 3" | DN80 | 88.9 | 3.500 | 5.49 | 7.62 |
| 4" | DN100 | 114.3 | 4.500 | 6.02 | 8.56 |
| 5" | DN125 | 141.3 | 5.563 | 6.55 | 9.53 |
| 6" | DN150 | 168.3 | 6.625 | 7.11 | 10.97 |
| 8" | DN200 | 219.1 | 8.625 | 8.18 | 12.70 |
Technical Notes:
Dimensions are nominal reference values for the specified pipe schedule.
Schedule 40 and Schedule 80 indicate wall thickness series, not fixed pressure ratings.
Actual tolerances depend on the manufacturing standard.
Galvanized coating may influence finished dimensions and threading requirements.
Structural tubing and lightweight pre-galvanized tubing may use different outside diameters and wall thicknesses.
Custom dimensions are subject to manufacturing capability and minimum order requirements.
Custom Diameter and Wall Thickness
For OEM applications and structural fabrication, round tubing may be specified directly by outside diameter and wall thickness.
Common requested dimensions include:
| Outside Diameter | Typical Requested Wall Thickness | Common Applications |
|---|---|---|
| 20–25 mm | 1.0–2.5 mm | Furniture frames, light structures |
| 32–42 mm | 1.2–3.0 mm | Fencing, greenhouse frames |
| 48.3 mm | 1.5–4.0 mm | Handrails, structural frameworks |
| 60.3 mm | 1.5–5.0 mm | Posts, supports, industrial frames |
| 76.1 mm | 2.0–5.0 mm | Agricultural and structural applications |
| 88.9 mm | 2.0–6.0 mm | Structural supports |
| 114.3 mm | 2.5–8.0 mm | Heavy-duty frames and posts |
| 168.3–219.1 mm | 3.0–10.0 mm | Larger structural and infrastructure projects |
These ranges are examples of commonly requested commercial dimensions rather than guaranteed availability or standard wall-thickness schedules.
For accurate procurement, buyers should specify the actual OD, nominal wall thickness, tolerance requirements, and applicable standard.
Hot-Dip Galvanized vs Pre-Galvanized Round Steel Pipe
The galvanizing process has a significant influence on coating coverage, corrosion resistance, fabrication performance, and cost.
Two major manufacturing routes are available.
Hot-Dip Galvanized Round Steel Pipe
Hot-dip galvanized round pipes are manufactured by producing the steel pipe first and subsequently immersing it in molten zinc.
When properly processed, the galvanizing operation protects both accessible external and internal surfaces, including the longitudinal weld area.
Key characteristics include:
Zinc coating applied after pipe manufacturing
Internal and external coating coverage
Zinc-iron alloy layers formed during galvanizing
Corrosion protection for exposed outdoor structures
Suitability for applications requiring specified coating thickness or coating mass
Additional coating verification according to the applicable standard
Hot-dip galvanized pipes are commonly used for outdoor structures, handrails, fencing, infrastructure, industrial supports, and appropriately specified piping systems.
Pre-Galvanized Round Steel Tubing
Pre-galvanized tubing is typically manufactured from continuously galvanized steel strip.
The galvanized strip is formed into a circular tube and longitudinally welded.
Because the original zinc coating is applied before tube formation, the welded area may require additional protective treatment.
Typical characteristics include:
Suitable for lightweight and medium-duty tubing applications
Commercially attractive for large production volumes
Relatively uniform original strip coating
Smooth appearance for many fabricated products
Weld seam protection requiring particular attention
Coating performance dependent on the original strip coating and subsequent processing
Pre-galvanized tubing is commonly used for indoor frames, furniture, light structural assemblies, agricultural structures, and protected industrial components.
Galvanizing Process Comparison
| Feature | Hot-Dip Galvanized After Fabrication | Pre-Galvanized Tubing |
|---|---|---|
| Processing Sequence | Form pipe, then galvanize | Galvanize strip, then form tube |
| External Coating | Yes | Yes |
| Internal Coating | Generally accessible surfaces | Depends on strip and tube process |
| Weld Area | Coated during subsequent galvanizing | Requires verification or repair |
| Coating Specification | Pipe or fabricated-product coating standard | Strip or continuous-tube coating specification |
| Common Applications | Outdoor structures and specified piping | Light structures and general fabrication |
| Cost | Depends on coating, size, and processing | Often economical for volume production |
| Corrosion Performance | Depends on specified coating and exposure | Depends on coating and seam protection |
Selection Recommendation: Specify the required coating performance and inspection criteria rather than selecting only by the terms "hot-dip" or "pre-galvanized."
Galvanized Round Steel Pipe Material Grades and Standards
Selecting the correct steel standard is essential for ensuring dimensional compatibility, mechanical performance, and application suitability.
Different pipe and structural tubing specifications should not be treated as automatically interchangeable.
Common Manufacturing and Delivery Standards
| Standard | Product Description | Typical Selection |
|---|---|---|
| ASTM A53/A53M | Welded and seamless carbon steel pipe, including hot-dip galvanized pipe | General piping applications |
| ASTM A500/A500M | Cold-formed structural carbon steel tubing | Structural fabrication |
| ASTM A1057/A1057M | Continuously hot-dip zinc-coated structural tubing, exterior surface | Galvanized structural tubing |
| EN 10255 | Non-alloy steel tubes suitable for welding and threading | Threaded and welded piping |
| EN 10219 | Cold-formed welded structural hollow sections | Structural engineering |
| GB/T 3091 | Welded steel pipes for low-pressure fluid transportation | Applicable piping projects |
Zinc Coating Standards
| Standard | Application |
|---|---|
| ASTM A53/A53M | Hot-dip zinc coating requirements for pipe ordered as galvanized under this specification |
| ASTM A123/A123M | Zinc coatings on applicable fabricated iron and steel products |
| ASTM A1057/A1057M | Exterior zinc-coated structural tubing manufactured on continuous coating lines |
| EN 10240 | Hot-dip galvanized coatings applied to steel tubes in automatic plants |
| ISO 1461 | Hot-dip galvanized coatings on fabricated iron and steel articles |
| ASTM A653/A653M | Zinc-coated steel sheet or strip used as input material for certain tubing processes |
Important: ASTM A653/A653M is primarily a coated sheet standard. It should not be used as the sole finished-product specification for galvanized round steel pipe.
Steel Grade Selection
Commonly requested steel grades include:
ASTM A53 Grade A and Grade B
ASTM A500 structural grades
EN 10219 structural steel grades such as S235JRH and S355J2H
EN 10255 grades and delivery conditions
Q195, Q235, and Q355 series under applicable Chinese standards
Grade substitutions require verification of chemical composition, mechanical properties, manufacturing requirements, tolerances, and intended service.
Grades from different standards are not automatically equivalent.
Chemical Composition of Galvanized Round Steel Pipe
The chemical composition of galvanized round steel pipe is determined by the underlying steel grade rather than the galvanizing process.
For reference, the following values apply to ASTM A53 Grade B seamless or electric-resistance-welded pipe, subject to the applicable standard edition.
ASTM A53 Grade B Chemical Composition
| Element | Maximum Content (%) |
|---|---|
| Carbon (C) | 0.30 |
| Manganese (Mn) | 1.20 |
| Phosphorus (P) | 0.050 |
| Sulfur (S) | 0.045 |
Additional alloying-element limits, applicable carbon-manganese adjustments, and product-analysis tolerances must be checked against the specified standard edition.
Other grades, including structural tubing and EN or GB materials, have different chemical requirements.
For project procurement, the material certificate should identify the actual heat analysis and applicable steel specification.
Mechanical Properties of Galvanized Round Steel Pipe
Mechanical properties depend on the steel grade, manufacturing process, wall thickness, and applicable product standard.
Galvanizing primarily provides corrosion protection; it does not independently establish the structural strength or pressure capacity of the pipe.
ASTM A53 Mechanical Properties
| Property | Grade A | Grade B |
|---|---|---|
| Minimum Tensile Strength | 330 MPa / 48 ksi | 415 MPa / 60 ksi |
| Minimum Yield Strength | 205 MPa / 30 ksi | 240 MPa / 35 ksi |
| Elongation | According to Standard | According to Standard |
| Testing Requirements | ASTM A53/A53M | ASTM A53/A53M |
These values are minimum specified requirements, not typical production test results.
Structural grades such as ASTM A500 or EN 10219 should be evaluated according to their respective standards and editions.
Typical Physical Properties of Carbon Steel
| Property | Approximate Reference Value |
|---|---|
| Density | 7,850 kg/m³ |
| Elastic Modulus | 200 GPa |
| Poisson's Ratio | 0.30 |
| Thermal Expansion Coefficient | Approximately 12 × 10⁻⁶/K near ambient temperature |
These are general engineering reference values for carbon steel, not guaranteed properties of every galvanized pipe grade.
Zinc Coating Requirements and Corrosion Protection
Zinc coating selection is a critical purchasing parameter for galvanized round steel pipe.
The appropriate coating should be specified according to the product standard, application environment, and intended service life.
Zinc Coating Selection
| Coating System | Specification Approach | Important Considerations |
|---|---|---|
| ASTM A53 Hot-Dip Galvanized Pipe | Meet ASTM A53 zinc coating requirements | Internal and external coating |
| EN 10240 Galvanized Tube | Specify applicable coating quality | Coating mass, coverage, and tests |
| ASTM A123 Hot-Dip Galvanizing | Specify fabricated-product coating requirements | Steel thickness and article category |
| ISO 1461 Hot-Dip Galvanizing | Specify applicable coating thickness requirements | Coating acceptance and inspection |
| Pre-Galvanized Strip-Based Tubing | Specify original strip coating designation | Weld repair and finished tube protection |
| ASTM A1057 Continuous Galvanized Tubing | Specify relevant tubing standard | Exterior coating coverage |
For ASTM A53 galvanized pipe, the specified minimum average coating mass is 0.55 kg/m², determined according to the standard's test and calculation method.
This should not be directly compared with two-sided sheet coating designations such as Z275 without accounting for differences in coating measurement and reporting methods.
Factors Affecting Corrosion Resistance
Atmospheric Exposure: Humidity, rainfall, and condensation influence zinc corrosion rates.
Chloride Exposure: Marine and coastal environments can accelerate zinc consumption.
Industrial Pollution: Sulfur-containing pollutants and other airborne contaminants may increase corrosion.
Surface Damage: Cutting, drilling, welding, and mechanical abrasion can expose the underlying steel.
Water Chemistry: The performance of galvanized pipe in contact with water depends on pH, dissolved constituents, temperature, and flow conditions.
For aggressive environments, additional protection or alternative materials may be required.
Galvanized Round Steel Pipe End Types and Custom Processing
Different end preparations are available to meet installation and fabrication requirements.
Plain End
Plain-end galvanized round steel pipes are commonly used for cutting, welding, fabrication, and mechanical connection systems.
End squareness and burr removal can be specified where necessary.
Beveled End
Beveled ends are used for applicable welded pipe connections.
Bevel angle, root face, and dimensional tolerances should follow the approved welding procedure or project specification.
Threaded End
Threaded galvanized pipes may be supplied with specified thread profiles and compatible fittings.
Common thread systems include:
NPT
BSPT
Parallel pipe threads where specified
Thread type, dimensional tolerance, sealing method, coupling compatibility, and coating protection must be confirmed before production.
NPT, BSPT, and parallel thread systems are not automatically interchangeable.
Grooved End
Grooved ends are used with compatible mechanical grooved-coupling systems.
The groove profile, outside diameter, wall thickness, and coupling manufacturer requirements must be verified.
Custom Fabrication Services
Depending on the material and project requirements, available processing options may include:
Precision cutting
Drilling and hole punching
Bending
Threading
Grooving
End deburring
Custom length preparation
Fabrication drawing review
Operations performed after galvanizing may damage the zinc coating.
Where necessary, affected areas should receive an approved coating repair or the component should be galvanized after fabrication.
Welding Safety: Welding galvanized steel can generate hazardous zinc-containing fumes. Suitable local exhaust ventilation, coating removal where required, and appropriate respiratory protection procedures must be implemented.
Industrial Applications of Galvanized Round Steel Pipe
Galvanized round steel pipes are widely used in structural, agricultural, commercial, and industrial projects.
1. Construction and Structural Fabrication
Galvanized round tubing is used in support frames, handrails, posts, access structures, and other fabricated assemblies.
The material grade and wall thickness must satisfy the project's structural design requirements.
2. Agricultural Greenhouses
Galvanized circular tubing is frequently selected for greenhouse frames, crop-support systems, agricultural enclosures, and related structures.
Coating selection should account for humidity, condensation, fertilizer exposure, and outdoor conditions.
3. Fencing and Security Systems
Round galvanized steel pipes are commonly used for fence posts, gates, barriers, and perimeter protection.
Pipe diameter, wall thickness, installation method, and coating durability should be specified according to the required loading conditions.
4. Industrial Frames and Equipment Supports
Galvanized steel tubing may be used in industrial support frames, machine guards, material-handling structures, and fabricated equipment assemblies.
Structural strength, joint design, and coating compatibility should be reviewed during fabrication planning.
5. Handrails and Guardrail Structures
Round galvanized tubing offers a practical profile for handrails, barriers, and protective structures.
Handrail and guardrail applications must comply with applicable building codes, loading requirements, and connection specifications.
6. Water and Utility Piping
Properly specified galvanized steel pipe may be used in permitted water or utility piping applications.
Suitability depends on the applicable pipe standard, pressure, temperature, water chemistry, operating conditions, and local regulations.
Galvanized structural tubing must not be substituted for pressure-rated pipe solely because the dimensions appear similar.
7. Scaffolding and Temporary Structures
Galvanized round tubes may be used in scaffolding and temporary structures when manufactured and verified to the applicable scaffolding standard.
General-purpose galvanized tubing should not be assumed to meet scaffolding safety requirements without the relevant product certification and engineering verification.
How to Select the Right Galvanized Round Steel Pipe
Purchasers should evaluate the following parameters before selecting galvanized round steel pipe.
Application and Service Conditions
Determine whether the tube will be used for structural support, fabrication, agricultural equipment, or a regulated piping service.
This determines the relevant material and inspection standards.
Outside Diameter and Wall Thickness
Specify the required outside diameter and nominal wall thickness.
For pipe-schedule products, identify the NPS and schedule designation.
For structural tubing, specify the OD × WT combination and applicable structural standard.
Galvanizing Method
Choose between after-fabrication hot-dip galvanizing, continuous galvanized tubing, or strip-based pre-galvanized tubing.
The selection should reflect corrosion requirements, production methods, fabrication requirements, and commercial considerations.
Required Zinc Coating
Specify the coating standard and required coating mass or thickness.
Do not rely on vague descriptions such as "heavy galvanized" or "high zinc coating" without measurable acceptance criteria.
Pipe End Configuration
Confirm whether plain, beveled, threaded, grooved, or custom-cut ends are required.
End dimensions and connection requirements should be reviewed before production.
Inspection and Documentation
Specify all required inspection reports, material certificates, coating test results, and third-party inspection requirements at the quotation stage.
Inspection and Quality Assurance
Xi'an Dongmeng Group Co., Ltd. supports product inspection and documentation review based on customer specifications and applicable manufacturing standards.
Inspection requirements should be confirmed before production or order acceptance.
Raw Material Verification
Steel grade identification
Heat number verification
Chemical composition review
Material certificate verification
Incoming material dimensional checks
Dimensional Inspection
Outside diameter
Wall thickness
Pipe length
Straightness
End squareness
Ovality where applicable
Dimensional tolerances
Mechanical and Weld Testing
Depending on the specified product standard and manufacturing route:
Tensile testing
Yield strength verification
Flattening or bending tests
Weld seam inspection
Hydrostatic testing where required
Applicable nondestructive examination
Zinc Coating Inspection
Coating thickness or coating mass
Coating coverage
Surface appearance
Weld seam protection
Coating discontinuities
Repair areas where permitted
Inspection Documentation
Available documentation can be specified according to the order, including:
Material Test Certificate
Chemical Analysis Report
Mechanical Test Report
Dimensional Inspection Report
Zinc Coating Inspection Report
Applicable Hydrostatic or NDT Report
EN 10204 Type 3.1 Certificate where contractually specified and supported
Independent Third-Party Inspection Report
The final inspection plan and documentation package depend on the selected specification, manufacturing route, and contractual requirements.
Packaging, Marking and International Delivery
Proper packaging is important for protecting galvanized round steel pipes during handling, storage, and international transportation.
Packaging Options
Steel-strapped pipe bundles
Protective wrapping where required
Plastic end caps
Thread protectors
Wooden supports or export packing where specified
Customized bundle quantities
Identification tags and shipping marks
Product Identification
Pipe identification may include:
Product standard and material grade
Pipe outside diameter and wall thickness
Heat number or production batch reference
Bundle quantity
Length and weight
Purchase order number
Customer-specific markings
Delivery Options
Standard and customized supply arrangements can be discussed according to order quantity, product dimensions, coating requirements, and processing complexity.
Shipment planning may include container loading, bundle optimization, export documentation, and agreed delivery terms.
Lead time and minimum order quantity are confirmed according to actual stock and production availability.
Why Choose Xi'an Dongmeng Group Co., Ltd.?
Xi'an Dongmeng Group Co., Ltd. serves international industrial buyers seeking galvanized steel products with clearly defined technical specifications and reliable procurement coordination.
Multiple Product and Coating Options
We support sourcing and specification review for different galvanized round steel pipe categories, including standard piping products and structural tubing.
Custom Dimensional Requirements
Our team can review project requirements for pipe sizes, wall thicknesses, lengths, and end preparation.
Technical Specification Support
We help customers identify relevant material standards, dimensional systems, coating requirements, and inspection documents before order confirmation.
Quality Control Coordination
Inspection requirements can be defined according to purchase specifications, including material verification, dimensional checks, coating inspection, and applicable mechanical testing.
B2B Export Support
We work with overseas distributors, contractors, fabricators, and industrial procurement teams requiring coordinated packaging, documentation, and international delivery.
Frequently Asked Questions
1. What is the difference between galvanized round steel pipe and galvanized round steel tubing?
The terms are sometimes used interchangeably in commercial markets.
However, steel pipe is commonly specified using nominal pipe sizes and schedules, while structural tubing is frequently ordered by actual outside diameter and wall thickness.
The applicable manufacturing standard should determine the technical requirements.
2. What is the difference between hot-dip galvanized pipe and pre-galvanized tubing?
Hot-dip galvanized pipe is coated after pipe manufacturing, generally allowing zinc coverage on accessible internal and external surfaces.
Pre-galvanized tubing is commonly produced from zinc-coated strip, with additional attention required for weld seam protection.
Actual corrosion performance depends on the specified coating and service conditions.
3. What are the common sizes of galvanized round steel pipes?
Common commercial sizes include 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 3", 4", 6", and 8".
Larger sizes and custom dimensions may be available depending on the manufacturing standard and production arrangements.
4. Can galvanized round steel pipe be supplied in Schedule 40 and Schedule 80?
Yes. Galvanized pipes can be specified with Schedule 40 or Schedule 80 wall thicknesses where supported by the applicable product standard.
The pipe schedule defines nominal wall thickness and does not independently establish pressure capacity.
5. Is galvanized round steel pipe suitable for outdoor applications?
Yes, when the zinc coating is appropriately specified for the exposure environment.
Outdoor corrosion performance depends on coating thickness, atmospheric conditions, drainage, maintenance, and mechanical damage.
Coastal and aggressive industrial environments may require additional evaluation.
6. Can galvanized steel pipe be used for drinking water?
Only where the selected pipe, coating, fittings, and complete installation comply with applicable drinking-water regulations and local plumbing codes.
Galvanized pipe is restricted or unsuitable for certain potable-water applications and should not be assumed acceptable without project-specific verification.
7. Can galvanized round steel pipes be welded?
Yes, galvanized carbon steel can be welded using suitable procedures.
Zinc coatings near the weld may need to be removed, and appropriate fume extraction and safety controls are essential.
Damaged coating areas require suitable corrosion-protection repair after welding.
8. Can I order custom-cut galvanized round steel tubing?
Custom-cut lengths may be available depending on outside diameter, wall thickness, steel grade, quantity, and processing requirements.
Buyers should provide the required length tolerance and end-finish specifications.
9. What inspection documents can be provided?
Documentation may include material certificates, chemical and mechanical test reports, dimensional inspection records, zinc coating reports, and applicable NDT or hydrostatic test reports.
EN 10204 Type 3.1 or third-party inspection should be requested before order confirmation.
10. What information is required for a galvanized round steel pipe quotation?
For an accurate quotation, please provide:
Product standard and material grade
Required outside diameter or NPS
Wall thickness or pipe schedule
Galvanizing method
Zinc coating requirements
Pipe length and end configuration
Total quantity
Required inspection documents
Delivery destination and shipping terms
Our sales team will review the requirements and confirm suitable product options, availability, processing arrangements, and quotation details.
Request a Quote – Galvanized Round Steel Pipe Supplier
Looking for galvanized round steel pipe for distribution, construction, industrial fabrication, or a customized project?
Xi'an Dongmeng Group Co., Ltd. provides galvanized pipe sourcing, technical specification review, customized processing coordination, and international export support.
Send us your required dimensions, material standard, coating specification, quantity, and delivery destination.
Our team can assist with:
Galvanized round pipe quotations
Standard and customized size inquiries
Hot-dip versus pre-galvanized selection
Technical drawing review
Material and inspection documentation
Export packing and shipping arrangements
Contact Xi'an Dongmeng Group Co., Ltd.
Email: office@dongmjd.com
Phone / WhatsApp: +86 15769214734
Address: Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province, China
Send Your Specifications for a Technical Quotation.
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