Seamless Pipe Structure – No longitudinal weld seam for pressure, fluid and mechanical applications.
Multiple Steel Grades – ASTM A106, A53, API 5L, Q345/Q355 and equivalent grades available.
Custom Dimensions – OD, wall thickness, length and pipe-end preparation can be customized.
Processing Available – Cutting, beveling, threading, painting, oiling and coating supported.
Complete Export Documents – MTC, COO and full commercial and shipping documentation available.
Carbon Steel Seamless Pipe is a round hollow steel product manufactured without a longitudinal welded seam. Its continuous pipe wall makes it widely used in applications requiring reliable pressure performance, dimensional consistency and mechanical strength.
Typical applications include oil and gas pipelines, water and fluid transmission, boilers, heat exchangers, hydraulic systems, machinery manufacturing, structural components and general industrial piping.
Henan GDD supplies carbon steel seamless pipes in multiple ASTM, API, EN, DIN and Chinese grades. Outside diameter, wall thickness, length, surface condition and pipe-end preparation can be customized according to customer drawings, standards and project requirements.
| Item | Specification |
|---|---|
| Product Name | Carbon Steel Seamless Pipe / Seamless Round Steel Pipe |
| Manufacturing Type | Hot Rolled Seamless / Cold Drawn Seamless / Cold Rolled Seamless |
| Common Grades | ASTM A106 Gr.B/Gr.C, ASTM A53 Gr.B, API 5L Gr.B/X42/X52, Q235, Q345B, Q355B, 20#, ST52 or Equivalent |
| Common Standards | ASTM A106/A106M, ASTM A53/A53M, API 5L, ASTM A519, EN 10216, DIN Standards, GB/T 8162, GB/T 8163 or Customer Specification |
| Outside Diameter | Approximately 10 mm – 610 mm or Customized According to Grade and Production Route |
| Wall Thickness | Approximately 1 mm – 60 mm or Customized |
| Length | 5.8 m, 6 m, 9 m, 11.8 m, 12 m, Random Length or Customized |
| Cross Section | Round |
| Surface | Black, Bare, Oiled, Varnished, Painted or Customized Protective Coating |
| End Type | Plain End, Beveled End, Threaded End or Customized |
| Processing | Cutting, Beveling, Threading, Drilling, Machining, Painting and Surface Protection |
| Inspection | Dimension Inspection, Chemical Composition, Mechanical Properties, Hydrostatic/NDT Where Required and Third-party Inspection Support |
| MTC | Mill Test Certificate / EN 10204 3.1 Where Applicable to Order Specification |
| Applications | Oil & Gas, Fluid Transmission, Pressure Systems, Boilers, Heat Exchangers, Machinery, Hydraulic Equipment and Structures |
| Available Documents | MTC, Certificate of Origin, Export License Where Applicable, Commercial Invoice, Packing List, Bill of Lading and Customs Documents |
| Packing | Steel Bundles, Steel Straps, End Caps, Waterproof Protection or Customized Seaworthy Export Packing |
| Trade Terms | EXW, FOB, CFR, CIF |
Available dimensions, grades and mechanical properties depend on the applicable standard, manufacturing route and mill capability. Final specifications should be confirmed through the purchase order, technical agreement and corresponding Mill Test Certificate.
Carbon Steel Seamless Pipe is manufactured from a solid round steel billet rather than by forming and welding steel strip or plate.
During seamless pipe production, the billet is heated and pierced to create a hollow shell. The shell is subsequently rolled, elongated and sized until the required outside diameter and wall thickness are achieved.
Because there is no longitudinal weld seam, seamless pipe is widely selected for pressure, temperature and mechanical applications where the applicable engineering specification requires seamless construction.
The principal structural difference is that seamless pipe does not contain a longitudinal weld seam, while welded pipe is manufactured by forming steel strip or plate and joining the edges through a welding process.
Seamless pipe is commonly selected for pressure piping, boilers, hydraulic systems, oil and gas service and machinery. Welded pipe can be more economical for many structural and large-diameter applications.
The correct choice should be based on the applicable piping code, pressure, temperature, service environment, required dimensions and project specification rather than assuming one manufacturing method is universally superior.
Hot rolled seamless pipe is widely used for medium and large outside diameters and general industrial piping applications.
The manufacturing route offers efficient production across a broad range of wall thicknesses and is commonly used for ASTM A106, API 5L and structural or mechanical pipe specifications.
Surface condition is typically black or mill finish, with oiling, varnishing, painting or other protective treatment available according to shipment and application requirements.
Cold drawing can be used when tighter dimensional tolerances, smoother surfaces or more precise outside and inside dimensions are required.
Cold drawn seamless tubes are commonly used for hydraulic systems, mechanical components, cylinders, precision equipment and machined parts.
Heat-treatment condition and mechanical properties should be confirmed according to the applicable standard and finished application.
ASTM A106 is one of the commonly specified standards for seamless carbon steel pipe intended for elevated-temperature service.
ASTM A106 Grade B is widely requested for industrial piping, refineries, petrochemical systems, power plants and pressure applications.
Grade, schedule, dimensions, heat treatment, testing and acceptance requirements should be specified according to ASTM A106/A106M and the customer's engineering documents.
ASTM A53 covers carbon steel pipe used in mechanical, pressure and general-purpose applications and includes seamless configurations within its applicable scope.
ASTM A53 Grade B seamless pipe is commonly requested for fluid systems, industrial piping and general engineering projects.
Customers should clearly specify that seamless manufacturing is required when ordering ASTM A53 material.
API 5L seamless pipe is used for pipeline transportation systems in the petroleum and natural-gas industries.
Common grade requirements can include Grade B, X42, X52 and other grades according to project specification and available production capability.
API product level, chemical composition, mechanical properties, testing and dimensional requirements should be confirmed according to the applicable edition and purchase specification.
Oil and gas projects can require seamless carbon steel pipe for process piping, pipeline connections, gathering systems and other pressure-service applications.
Material selection should consider design pressure, design temperature, transported medium, corrosion allowance, pipe schedule and applicable engineering code.
Customers can provide the project material specification or existing MTO/BOM so that grade, dimensions and documentation requirements can be reviewed before quotation.
Carbon Steel Seamless Pipe is widely used for water, oil, steam and other fluid-transmission systems where the selected grade and standard are appropriate.
Outside diameter, wall thickness and pipe schedule should be determined according to operating pressure, temperature and engineering design.
Hydrostatic testing or non-destructive testing can be specified according to the applicable material standard and purchase requirements.
Boilers and heat-transfer systems can require seamless tubes capable of operating under controlled pressure and temperature conditions.
The exact steel grade and standard depend on the boiler design, service temperature, pressure level and applicable engineering code.
Customers should provide the required standard, material grade, dimensions and operating conditions rather than selecting boiler pipe only according to nominal size.
Mechanical applications can use seamless round tubing for shafts, rollers, sleeves, machine frames, hydraulic components and machined structural parts.
In these applications, dimensional tolerance, wall consistency, straightness and machining allowance may be more important than pressure-rating requirements.
Cold drawn and precision seamless options can be discussed when tighter dimensional control is required.
Seamless pipe is normally specified using outside diameter and wall thickness or a nominal pipe size and schedule.
Two pipes with the same outside diameter can have very different internal diameters and weight when their wall thicknesses differ.
Customers should therefore confirm OD, wall thickness, length, tolerance and applicable standard before purchase.
Pipe schedules such as SCH 20, SCH 40, SCH 80, SCH 160 and XXS are commonly used in piping specifications, although available schedules depend on nominal pipe size and applicable dimensional standard.
Schedule number should not be interpreted as a fixed millimeter wall thickness across every pipe diameter.
Henan GDD recommends confirming both nominal pipe size and required schedule or specifying the exact OD × wall thickness combination.
Plain ends are suitable for cutting, machining and various fabrication processes.
Beveled ends can be prepared for butt-welded piping systems according to the required bevel specification.
Threaded ends can be supplied for suitable dimensions and standards where threaded pipe connections are required.
Standard carbon steel seamless pipes are often supplied with a black or bare mill surface.
Temporary anti-rust oil, protective varnish, primer coating or other surface protection can be applied according to transportation and storage requirements.
For projects requiring additional corrosion protection, coating specifications should be provided before quotation.
Seamless pipes can be cut into fixed lengths according to project or machinery requirements.
Beveling, threading, drilling and selected machining services can also be coordinated according to drawings and production capability.
For cut-to-length orders, customers should provide the required tolerance and whether end machining is included in the finished length.
A typical industrial piping buyer requires ASTM A106 Grade B seamless pipes in several outside diameters and wall thicknesses for fluid-transmission lines.
During technical confirmation, the main items include ASTM grade, pipe schedule, fixed or random length, beveled ends, surface protection and MTC requirements.
For projects containing multiple sizes, Henan GDD can organize the materials by specification and provide package identification to simplify receiving and installation.
A machinery customer may require thick-wall seamless round tubes that will subsequently be cut and machined into rollers, sleeves or structural components.
For this type of project, dimensional tolerance, straightness, wall thickness and machining allowance are reviewed more closely than conventional structural-pipe requirements.
An oil and gas equipment supplier may require API 5L or ASTM seamless material for fabricated piping assemblies.
In this application, traceability, heat numbers, MTC documentation, end preparation and agreed inspection requirements are confirmed before shipment.
Customer names, confidential prices and proprietary project documents are not published without authorization.
Seamless pipe inspection begins by confirming that grade, outside diameter, wall thickness, length and manufacturing route correspond to the approved purchase specification.
Inspection can include dimensional measurement, visual surface inspection, chemical composition verification and mechanical-property review according to the applicable standard.
Hydrostatic testing, ultrasonic testing, eddy-current testing or other NDT methods can be specified where required by the material standard or purchase contract.
Additional third-party inspection can be arranged according to the agreed inspection scope.
Material traceability is important for pressure piping, energy projects and engineered equipment.
Heat numbers and pipe identification can be linked to the corresponding Mill Test Certificate according to the mill's production and marking system.
MTC can include material grade, heat number, chemical composition, mechanical properties, dimensions and relevant inspection results according to the applicable specification.
EN 10204 3.1 documentation can be provided where applicable to the ordered material and agreed documentation requirements.
Independent inspection can be arranged when required by the customer, project owner or purchase contract.
Inspection scope can include quantity, dimensions, markings, surface condition, MTC review, packing and loading verification.
Where laboratory or NDT witnessing is required, the standard, testing method and acceptance criteria should be confirmed before production.
Henan GDD supports international seamless-pipe shipments with technical, commercial and customs documentation prepared according to the destination country and contract requirements.
Available documents can include Mill Test Certificate, Certificate of Origin, export license where applicable, commercial invoice, packing list, bill of lading and customs declaration documents.
Product photographs, marking photographs, packing photographs, loading photographs and agreed third-party inspection reports can also be provided.
Destination-specific legalization, chamber endorsement and additional customs-document requirements should be confirmed before order placement.
Carbon Steel Seamless Pipes can be bundled with reinforced steel straps for safe lifting, storage and international transportation.
Plastic or metal end caps can be applied where required to protect beveled or machined pipe ends.
Waterproof wrapping, anti-rust oil and additional protective packing can be arranged according to shipping route and customer requirements.
Each bundle can be marked with grade, dimensions, heat or batch information, quantity and customer shipping marks according to the contract.
Henan GDD supplies Carbon Steel Seamless Pipe to piping contractors, machinery manufacturers, oil and gas equipment suppliers, distributors and industrial project customers.
We support multiple ASTM, API, EN, DIN and Chinese grades together with customized OD, wall thickness, length, end preparation and surface treatment.
Technical specifications, MTO lists, drawings and existing MTCs can be reviewed before quotation to improve material matching.
MTC, Certificate of Origin, export license where applicable and complete commercial and shipping documents can be supplied according to contract requirements.
From material sourcing and processing through inspection, packing and international shipment, our team provides one-stop export support for seamless steel pipe projects.
Carbon Steel Seamless Pipe is manufactured from a solid steel billet without a longitudinal welded seam and is widely used for pressure, fluid, mechanical and industrial applications.
Common options include ASTM A106 Gr.B/Gr.C, ASTM A53 Gr.B, API 5L Gr.B/X42/X52, Q345B, Q355B, 20# and other equivalent grades according to order requirements.
Typical supply ranges can cover approximately 10–610 mm outside diameter and 1–60 mm wall thickness, subject to grade, standard and production capability.
Yes. Schedule-based seamless pipe such as SCH 40 and SCH 80 can be supplied where available for the required nominal pipe size and standard.
Yes. Plain, beveled and suitable threaded-end processing can be arranged according to order specifications.
Yes. MTC, Certificate of Origin, export license where applicable, commercial invoice, packing list, bill of lading and other agreed export documents can be provided.
Please provide standard, steel grade, outside diameter, wall thickness or schedule, length, quantity, end type, surface requirement, destination port and required documents.
Yes. Third-party inspection can be arranged according to the inspection scope agreed in the purchase contract.
Looking for Carbon Steel Seamless Pipe for pressure piping, oil and gas, fluid transmission, machinery, boilers or industrial projects?
Send Henan GDD your required standard, grade, OD, wall thickness or schedule, length, quantity, end preparation, destination port and required documentation.
If you are replacing an existing supplier, you can also send your current MTC, pipe specification, MTO/BOM or technical drawing for comparison and quotation.
