1-Inch Galvanized Steel Pipe/Tube

Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of 1-inch galvanized steel pipe/tube in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.

1 Inch Galvanized Steel Pipe – DN25 Hot Dip GI Pipe, ASTM A53 Sch 40/80

Xi'an Dongmeng Group Co., Ltd. supplies 1 inch galvanized steel pipe (DN25 GI pipe) for industrial piping, construction, agricultural infrastructure, mechanical fabrication and general steel distribution.

Our product selection covers ASTM A53 Grade A/B galvanized steel pipes, EN 10255 medium and heavy series tubes, and customized galvanized round steel tubing for project-specific requirements.

For ASTM pipe dimensions, 1 inch NPS corresponds to an outside diameter of approximately 33.4 mm (1.315 inches). Schedule 40 and Schedule 80 nominal wall thicknesses are 3.38 mm and 4.55 mm, respectively. EN 10255 DN25 products use a specified outside diameter of 33.7 mm.

Available procurement configurations include hot-dip galvanized finishes, ERW or seamless pipe options, plain ends, threaded and coupled connections, customized cutting lengths, and export-oriented packaging.

We assist international distributors, contractors, EPC purchasers and fabrication companies with size selection, technical documentation, batch inspection arrangements and international shipping coordination.

Request a quotation: Share your required standard, outside diameter, wall thickness, coating specification, pipe length, quantity and destination port.

A 1 inch galvanized steel pipe is a nominal-size carbon steel pipe protected by a zinc coating to reduce atmospheric corrosion of the underlying steel.

The term "1 inch" generally refers to the nominal pipe designation rather than the actual outside diameter. Consequently, buyers should confirm the applicable dimensional standard before ordering replacement pipes, couplings, threaded fittings or fabricated assemblies.

Galvanized pipes are used in applications where carbon steel strength, mechanical durability, fabrication flexibility and corrosion protection are important.

Common product configurations include:

ASTM A53 galvanized pipe: For mechanical and piping applications within the applicable project requirements.

EN 10255 galvanized tube: For threaded and weldable steel tube applications under European specifications.

Pre-galvanized ERW round tube: A separate commercial tubing option for suitable lightweight fabrication and structural uses.

Custom galvanized structural tubing: For frames, fences and engineered supports, subject to the structural specification.

Selecting a 1 inch pipe requires more than identifying its nominal diameter. Wall thickness influences pipe mass, internal flow area, connection compatibility and the results of pressure-design calculations.

Dimensions are nominal. ID values are calculated approximations. Weights refer to uncoated pipe and exclude zinc, couplings and packaging. EN 10255 values follow the relevant dimensional series.

How to calculate theoretical pipe weight

For a plain circular steel tube:

W=0.02466* t*(D-t) 

Where:

W = theoretical steel weight in kg/m

(D= outside diameter in mm

t = nominal wall thickness in mm

For a 33.4 × 3.38 mm pipe, the approximate theoretical weight is 2.50 kg/m, before galvanizing. Actual shipping weight depends on coating mass, dimensional tolerances and end connections.

Important selection note: If your purchase drawing specifies a true 25.4 mm outside diameter rather than NPS 1, request a 25.4 mm OD galvanized round tube. These are different dimensional products.

Different international standards address different end uses, dimensional requirements and testing obligations.

ASTM A53/A53M is a recognized specification for black and hot-dip zinc-coated welded and seamless steel pipe. Structural tubing specifications such as ASTM A500 have different requirements and should be evaluated independently.

Our selection approach

For projects requiring ASTM A53 galvanized pipe, the purchase specification should clearly identify the pipe type, material grade, nominal size, wall schedule and galvanized finish.

For EN 10255 projects, buyers should additionally confirm the medium or heavy series, thread specification and relevant coating requirements.

For structural applications, the designated structural grade, member dimensions, load calculations and fabrication drawings take precedence over general commercial descriptions.

The following reference information is relevant to ASTM A53 Type E and Type S pipe. The actual material grade and applicable revision must be stated in the purchase order.

ASTM A53 Mechanical Properties

Selected composition limits for ASTM A53 Type E pipe. Additional alloy-element limits, permitted manganese adjustments and other requirements remain governed by the specified edition.

Grade B is frequently specified where higher minimum strength is required, while Grade A may be selected for particular forming operations. Material suitability must be assessed against the project specification and design conditions.

Galvanizing methods are important because they affect coating continuity, fabrication sequence, corrosion resistance and conformity to product standards.

Galvanizing Process Comparison

Hot-Dip Galvanized Steel Pipe

Hot-dip galvanizing applies a protective zinc layer to a prepared steel pipe after pipe manufacture.

For ASTM A53 galvanized pipe, the standard requires zinc coating on both the inside and outside by the hot-dip process. The applicable coating-mass requirements include an average minimum of 0.55 kg/m² under the specified test method.

A purchaser should confirm the coating specification, required testing and acceptance criteria rather than relying on a generic zinc-coating range.

Pre-Galvanized Steel Tube

Pre-galvanized tubing is manufactured from zinc-coated strip or coil. The coated strip is formed and welded into a tubular section, and the weld region requires suitable protection.

This route may offer manufacturing and cost advantages for selected fabrication applications, but it should not be described as equivalent to finished-pipe hot-dip galvanizing under ASTM A53 without evidence of conformity.

The end configuration should be selected according to the joining system, relevant pipe dimensions and the approved installation design.

Plain End (PE) Square-cut or specified prepared ends for mechanical connections, fabrication and subsequent processing. Cutting accuracy, deburring and end protection can be specified in the purchase order.

Threaded & Coupled (T&C) Threaded galvanized pipes for compatible pipe fittings. Specify NPT, BSPT or another approved thread system and confirm thread compatibility before ordering.

Grooved End Grooved pipe ends may be evaluated for mechanical coupling systems where the selected pipe size, wall thickness and coupling manufacturer's specifications permit the connection.

Customized Cutting & End Preparation Project-specific cutting, length marking and end preparation can be discussed against approved drawings, manufacturing capability and coating repair requirements.

Fabrication note: Welding or thermal cutting of galvanized steel requires suitable fume controls, and the affected coating may require restoration. Zinc-containing welding fumes present a recognized occupational exposure hazard.

For fire protection, fuel gas, potable water or other regulated systems, the applicable product approvals, installation codes and project specifications must be confirmed separately.

Quality assurance for galvanized steel pipe should cover the base steel, pipe manufacture, coating process and finished product.

Incoming Material Verification

Review of material grade, heat identification and traceability documentation according to the approved order.

Dimensional Inspection

Measurement of outside diameter, wall thickness, pipe length, straightness and end dimensions against the designated standard.

Coating Inspection

Inspection of zinc coverage, visible defects and coating characteristics using the applicable standard and agreed sampling requirements.

Mechanical & Pipe Testing

Tensile testing, bending or flattening tests, and hydrostatic or permitted nondestructive examination as required by the selected product standard.

Final Inspection & Documentation

Preparation or review of relevant inspection records, material test certificates, marking and shipping documentation. Third-party inspection can be arranged where agreed.

Documentation requirements, including EN 10204 3.1, should be stated before production and verified against the available supply route.

Xi'an Dongmeng Group Co., Ltd. supports international galvanized steel pipe procurement through specification review, coordinated processing, export packing and shipping arrangements.

For bulk orders, the packing plan may include steel-strapped bundles, pipe-end protection, identification tags and moisture-protection materials according to transportation requirements.

Custom cutting lengths and mixed-size shipments can be evaluated based on production, container loading and project requirements.

Final MOQ, production lead time, packing weight and shipment terms are confirmed at quotation stage rather than stated as universal guarantees.

Application-Based Material Selection

We help purchasers distinguish between nominal pipe sizes, dimensional standards, material grades and galvanized finishes to reduce specification errors.

Multiple Procurement Configurations

Choose the appropriate ASTM, EN or structural tubing route, with pipe-end and length options evaluated for the actual project.

Inspection & Traceability Support

Material certificates, coating inspection reports and independently arranged inspections may be incorporated into the supply plan where required.

International Supply Coordination

We support overseas purchasing teams with quotation preparation, export packing and trade documentation.

Clear Technical Communication

Our quotation process identifies the exact product specification before finalizing price, lead time and shipping arrangements.

Q1. What is the actual outside diameter of a 1 inch galvanized steel pipe?

Under the ASTM NPS system, 1 inch pipe has a nominal outside diameter of 33.4 mm. Under EN 10255, DN25 has a specified OD of 33.7 mm. Always confirm which dimensional standard applies.

Q2. Is a 1 inch galvanized pipe the same as a 25.4 mm galvanized tube?

No. NPS 1 denotes a nominal pipe size, whereas 25.4 mm OD describes the actual outside diameter of another tube size. They should not be substituted without checking the design.

Q3. What is the wall thickness of 1 inch Schedule 40 galvanized pipe?

The nominal wall thickness is 3.38 mm (0.133 in). The corresponding bare-steel theoretical weight is approximately 2.50 kg/m.

Q4. What is the wall thickness of 1 inch Schedule 80 galvanized pipe?

The nominal wall thickness is 4.55 mm (0.179 in). Its bare-steel theoretical mass is approximately 3.23 kg/m.

Q5. What is the difference between Schedule 40 and Schedule 80 GI pipe?

For the same nominal outside diameter, Schedule 80 has a thicker wall and smaller internal diameter. It may be selected for applications needing greater wall thickness, but the allowable system pressure must be calculated under the applicable design code.

Q6. Is ASTM A53 galvanized pipe suitable for outdoor use?

Hot-dip galvanized pipe can provide corrosion protection in many atmospheric environments. Actual service life depends on coating quality, humidity, pollutants, chemical exposure and maintenance conditions.

Q7. What is the difference between hot-dip galvanized and pre-galvanized pipe?

Hot-dip galvanizing of finished pipe coats the completed tubular product. Pre-galvanized tubing is formed from previously coated strip. Their coating continuity and specification requirements may differ.

Q8. Can 1 inch galvanized steel pipe be supplied with threaded ends?

Threaded and coupled configurations can be specified. Purchasers should identify the required thread form, such as NPT or BSPT, and the compatible fittings.

Q9. Can galvanized steel pipes be used for drinking water?

Suitability depends on local drinking-water regulations, water chemistry and required approvals. A generic galvanized pipe specification does not establish potable-water compliance. Where required, the actual product must meet relevant drinking-water contact requirements, such as NSF/ANSI/CAN 61.

Q10. What inspection documents can be requested?

Depending on the selected production route and confirmed order, documents may include material test certificates, dimensional inspection results, coating reports, product conformity statements and third-party inspection reports.

Q11. Can I order 5.8 m or 6 m galvanized pipes?

Standard commercial lengths and customized cutting arrangements can be evaluated. State your required finished length and tolerance in the RFQ.

Q12. How much 1 inch galvanized pipe can be loaded into a container?

The quantity depends on wall thickness, coated weight, pipe length, packaging, container payload limits and loading restrictions. A container loading plan should be prepared for the actual order.

Q13. Can ASTM A53 pipe be used for structural applications?

ASTM A53 pipe can be considered for appropriate mechanical and other permitted uses, but structural design must follow the relevant building code and project requirements. It should not automatically replace ASTM A500 structural tubing.

Q14. What information is required to obtain an accurate quotation?

Please provide the applicable standard, steel grade, outside diameter or nominal size, wall thickness, galvanizing process, end connection, length, total quantity, inspection requirements and delivery destination.

Looking for a reliable source of 1 inch galvanized steel pipes for wholesale distribution or industrial projects?

Xi'an Dongmeng Group Co., Ltd. can assist with material selection, dimensional verification, coating specifications, customized order requirements and international procurement.

Send us your project specifications or purchase list to receive an itemized quotation covering technical parameters, supply conditions, inspection requirements and shipping arrangements.

Send Your RFQ Today

For faster quotation preparation, please include:

Product: 1 Inch Galvanized Steel Pipe / DN25 GI Pipe

Standard: ASTM A53 / EN 10255 / Other

Wall thickness: Sch 40 / Sch 80 / Specified mm

End type: Plain / Threaded & Coupled

Coating: Applicable hot-dip galvanizing requirement

Quantity: Metric tons or pieces

Destination: Country and port

Office Information

Phone

+86 157 6921 4734

Email

office@dongmjd.com

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Office Address

Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province, China

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