Stainless Steel Welded Tube
Stainless steel welded tubes for heat exchangers, tubular heating elements, cartridge heater sheath tubes, condensers, evaporators, industrial refrigeration, appliance heating and industrial tubing applications.
GAOFA TECH supplies stainless steel welded tubes in common austenitic, heat-resistant and duplex grades. Tube selection should be confirmed according to working medium, temperature, pressure, corrosion conditions, forming process, inspection requirement and customer specification.
Key Purchase Information for Stainless Steel Welded Tubes
This quick snapshot helps engineers and procurement teams confirm the basic specification direction before sending an RFQ. Final tolerance, condition, inspection, internal bead requirement and packing should be confirmed according to the applicable standard and customer specification.
Other grades can be reviewed according to size, condition, application and quantity.
Used for heat exchanger tubing, general welded tubing, mechanical tubing, sanitary tubing and duplex tubing.
Can be reviewed when the buyer requests welded stainless steel pipe rather than tube.
Small OD, thin-wall and cut-to-length welded tube requirements should be checked carefully.
Condition should be confirmed according to downstream forming, assembly, surface and inspection requirements.
Application background helps review grade, tube condition, straightness, internal cleanliness and packing.
What Is a Stainless Steel Welded Tube?
A stainless steel welded tube is produced from stainless steel strip or coil. The strip is formed into a tubular shape, welded along the longitudinal seam and then processed according to the required tube condition, dimensional tolerance, surface requirement and inspection standard.
Compared with seamless tube, welded tube is often considered when buyers need stable wall thickness, controlled dimensions, economical production for repeated orders, long straight lengths or application-specific tube condition. However, seamless tube may still be required for some pressure service, special forming, severe corrosion, high-temperature or end-user specification requirements.
- Welded tube does not automatically replace seamless tube in every application.
- The correct choice depends on medium, pressure, temperature, corrosion risk, forming process, standard and customer drawing.
- For heating element and cartridge heater sheath tubes, straightness, internal condition, tube end protection and cut length can be as important as material grade.
Stainless Steel Welded Tube Specification
The following table shows common supply information. Final feasibility, tolerance, testing method and tube condition should be confirmed according to requested standard, size, application and order quantity.
| Item | Available Options | Notes for Buyers |
|---|---|---|
| Product Type | Stainless steel welded tube / welded stainless steel tubing | Produced from stainless steel strip or coil by forming and longitudinal welding. |
| Material Grades | 304, 304L, 316L, 321, 309S, 310S, 904L, Duplex 2205, Super Duplex 2507 | Grade selection should be reviewed according to medium, temperature, corrosion condition and fabrication process. |
| ASTM Tube Standards | ASTM A249, ASTM A269, ASTM A554, ASTM A270, ASTM A789 | Used for heat exchanger tubing, general welded tubing, mechanical tubing, sanitary tubing and duplex stainless steel tubing. |
| ASTM Pipe Standards | ASTM A312, ASTM A778, ASTM A358, ASTM A790 | Used when the inquiry is for welded stainless steel pipe, larger pipe, fusion-welded pipe or duplex stainless steel pipe. |
| Other Standards | EN, JIS or customer-specified standards can be reviewed | Please provide exact standard, grade, tolerance and testing requirements in the RFQ. |
| Outer Diameter | 6.0 mm to 88.9 mm | Small OD and thin-wall welded tubes should be reviewed together with straightness and packing requirements. |
| Wall Thickness | 0.3 mm to 2.0 mm | Thin-wall tubes may require closer handling, dimensional inspection and packing control. |
| Length | Standard 6000 mm; fixed length or cut length upon request | Please provide length tolerance and end condition requirements for cut-to-length tubes. |
| Condition | As welded, fully annealed, polished as specified | Condition should be selected according to downstream bending, forming, assembly, appearance and inspection requirements. |
| Weld Seam / Bead Requirement | As welded, external bead treatment, internal bead requirement as agreed | Please confirm if internal bead removal or internal smoothness is required by the application. |
| Testing | Chemical analysis, mechanical testing, dimensional inspection, visual inspection, eddy current, hydrostatic, pneumatic, PMI or other testing as required | Testing scope, sampling level and acceptance criteria should be confirmed before production. |
| Packing | Bundles, wrapping, tube end protection, wooden case or customized export packing | Packing should be confirmed according to tube size, length, surface condition and shipping method. |
Common ASTM Standards for Stainless Steel Welded Tubes
Buyers often search by ASTM standard. The correct standard should be selected according to whether the product is requested as tube, tubing or pipe, and according to application, grade, condition and testing requirement.
| Standard | Common Product Direction | How to Use It on This Page |
|---|---|---|
| ASTM A249 / A249M | Welded austenitic steel boiler, superheater, heat-exchanger and condenser tubes | Main standard direction for welded heat exchanger tubes, condenser tubes and thermal equipment tubing. |
| ASTM A269 / A269M | Seamless and welded austenitic stainless steel tubing for general corrosion-resisting and low / high temperature service | Common standard for general industrial welded tubing, instrumentation lines and corrosion-resisting service. |
| ASTM A554 | Welded stainless steel mechanical tubing | Useful for mechanical, structural, appearance-related or general industrial tube requirements. |
| ASTM A270 / A270M | Sanitary stainless steel tubing | Application-specific standard. Use only when the buyer requests sanitary, hygienic or high-cleanliness tubing. |
| ASTM A789 / A789M | Seamless and welded ferritic / austenitic stainless steel tubing | Used for duplex stainless steel tubing such as 2205 or super duplex directions when applicable. |
| ASTM A312 / A312M | Seamless and welded austenitic stainless steel pipe | Pipe standard. It can be reviewed when the buyer requests stainless steel welded pipe rather than tube. |
| ASTM A778 / A778M | Welded, unannealed austenitic stainless steel tubular products | More relevant to larger welded tubular products and pipe-type requirements, not typical small precision welded tube. |
| ASTM A358 / A358M | Electric-fusion-welded austenitic chromium-nickel stainless steel pipe | Pipe standard for selected high-temperature and corrosive service pipe requirements. |
| ASTM A790 / A790M | Seamless and welded ferritic / austenitic stainless steel pipe | Pipe standard for duplex stainless steel pipe. It should not be mixed with tube standards without checking the RFQ wording. |
Common Stainless Steel Grades for Welded Tubes
Grade selection should not be based only on price. Working medium, chloride level, temperature, cleaning chemicals, pressure, bending, forming and welding condition should be considered before replacing one grade with another.
| Grade | Typical Use Direction | Selection Notes |
|---|---|---|
| 304 / 304L | General industrial welded tubing, appliance heating, light corrosive service and mechanical tubing | Common austenitic stainless steel grade. Not recommended as a direct substitute for 316L in chloride-containing media without review. |
| 316L | Heat exchangers, condensers, evaporators, heating element tubes, cartridge heater sheath tubes and chemical equipment | Often selected where better pitting and crevice corrosion resistance is needed compared with 304. |
| 321 | Thermal cycling, heater-related components and selected high-temperature equipment | Titanium-stabilized grade. Suitability should be checked against service temperature, atmosphere and fabrication process. |
| 309S / 310S | High-temperature oxidation service, furnace-related equipment and heater applications | Higher chromium and nickel content than 304 / 316L. Temperature, atmosphere and mechanical load should be reviewed. |
| 904L | Chemical processing and selected acid service | Used for specific corrosion requirements. Availability, tube condition and quantity should be confirmed before quotation. |
| Duplex 2205 / Super Duplex 2507 | Higher strength and chloride-containing environments | Duplex welded tube or pipe should be reviewed according to ASTM A789 / A790, corrosion conditions and fabrication requirements. |
Stainless Steel Welded Tube vs Seamless Tube
Many buyers compare welded tube and seamless tube during procurement. The better option depends on standard, pressure, corrosion condition, tube size, forming process, delivery time, cost target and customer specification.
When Welded Tube Is Often Considered
- Application allows welded tube according to the design standard
- Stable wall thickness and dimensional consistency are important
- Cost and repeated production quantity are important
- Long straight tubes are needed for heating element production
- Surface condition, straightness, cut length and packing are key concerns
- Customer specification accepts ASTM A249, A269, A554 or similar welded tubing standards
When Seamless Tube May Be Required
- Customer drawing or end-user specification clearly requires seamless tube
- Higher pressure or more critical service conditions are involved
- Demanding bending, flaring or forming is required
- Weld seam concern exists due to corrosion, temperature or process conditions
- Special pipe or tube standards require seamless product
- The application has already been validated with seamless tube only
Applications of Stainless Steel Welded Tubes
GAOFA TECH supplies stainless steel welded tubes for industrial buyers who need controlled dimensions, stable tube condition, material traceability, application-specific inspection and export packing support.
Tubular Heating Elements
Used for tubular heating element production where straightness, surface condition, internal cleanliness, dryness and cut length should be specified clearly.
Cartridge Heater Sheath Tubes
Small OD welded stainless steel tubes may be reviewed for cartridge heater sheath applications depending on OD, tolerance, internal condition and downstream assembly process.
Shell & Tube Heat Exchangers
ASTM A249 welded tubes are often reviewed for heat exchanger, condenser and thermal equipment applications where the design accepts welded tubing.
Condensers & Evaporators
Used in condenser and evaporator systems where stainless steel is required by the working medium, equipment design or corrosion condition.
Industrial Refrigeration
Welded stainless steel tubes can be discussed for refrigeration equipment, cooling systems and auxiliary lines according to design requirements.
Appliance Heating & Water Heating
Stainless steel welded tubes may be reviewed for appliance heating, water heating and heater sheath applications where grade, condition and cleanliness are specified.
Fluid & Instrumentation Lines
ASTM A269 welded tubing can be reviewed for general corrosion-resisting tubing, fluid lines and selected instrumentation applications.
High-Temperature Equipment
321, 309S and 310S welded tubes may be considered for heater, furnace and thermal equipment applications depending on temperature and atmosphere.
General Industrial Tubing
Welded stainless steel tubing can be reviewed for mechanical, structural or industrial tube uses where the applicable standard and tube condition are confirmed.
Condition, Weld Seam and Manufacturing Route
Stainless steel welded tube condition should be confirmed according to downstream use. For heating elements, heat exchangers and cartridge heaters, condition, internal bead, internal cleanliness and packing can directly affect production performance.
Stainless steel strip or coil is selected according to material grade, standard and size requirement.
The strip is continuously formed into a tubular shape before welding.
The longitudinal seam is welded according to tube size, grade and application requirement.
Tube condition can be as welded, fully annealed or polished as specified.
Dimensional, visual, NDT, cleanliness and packing checks are arranged as required or as agreed.
Condition: As Welded
As welded condition may be suitable for selected industrial tubing applications where the design accepts the welded condition. Final acceptance depends on standard, application, corrosion condition and customer specification.
Condition: Fully Annealed or Polished
Fully annealed or polished condition can be reviewed when downstream forming, appearance, surface condition or cleanliness requirements are important. The required condition should be stated clearly in the RFQ.
Inspection Support for Stainless Steel Welded Tubes
Inspection requirements should be confirmed before production, especially for heating element tubes, cartridge heater sheath tubes, heat exchanger tubes, condensers, evaporators, thin-wall welded tubes and polished-condition tubes.
| Inspection Item | Purpose | Common Requirement |
|---|---|---|
| Material Verification | Confirm chemical composition and grade traceability | MTC, heat number, chemical analysis and PMI / handheld spectrometer checking if required |
| Dimensional Inspection | Control OD, wall thickness, length, tolerance and straightness | OD inspection, wall thickness inspection, length check and tolerance review according to standard or drawing |
| Weld Seam Review | Review weld seam condition and bead requirement | Visual review, external bead condition and internal bead requirement as required or as agreed |
| Mechanical Testing | Verify mechanical performance according to standard | Tensile, hardness, flattening, flaring or other tests as specified |
| Non-Destructive Testing | Check tube integrity without damaging the tube | Eddy current, hydrostatic, pneumatic or other testing method according to standard and customer specification |
| Surface and Internal Cleanliness | Review surface condition, inner condition, residue and dryness | Visual inspection, internal cleanliness review, sponge cleaning, air blowing or agreed cleanliness requirement as required |
| Packing Inspection | Protect tubes during storage and international transport | Bundles, wrapping, tube end protection, wooden cases or customized export packing |
View Tube Inspection and Quality Control Details
Review GAOFA TECH’s tube inspection examples, including eddy current testing, pneumatic testing, PMI checking, visual inspection, OD and wall thickness inspection, internal cleanliness checking, fatigue testing and packing review. Actual testing scope, records and videos should be confirmed as required or as agreed.
Information Needed for a Stainless Steel Welded Tube Quotation
To provide an accurate stainless steel welded tube quotation, GAOFA TECH recommends that buyers send tube size, grade, standard, condition, weld seam requirement, inspection requirement and application background together.
This helps reduce repeated communication and avoids incorrect grade selection, missing testing requirements or unsuitable packing details.
- Material grade: 304, 304L, 316L, 321, 310S, 904L, 2205, 2507 or other grade
- Standard: ASTM A249, ASTM A269, ASTM A554, ASTM A270, ASTM A789, ASTM A312, ASTM A778, ASTM A358, ASTM A790 or customer standard
- Please confirm whether the requirement is for tube, tubing or pipe
- Outer diameter, wall thickness and tolerance
- Length: standard 6000 mm, fixed length or cut length
- Quantity: meters, pieces or kilograms
- Condition: as welded, fully annealed, polished as specified
- Weld seam / internal bead requirement: as welded, bead treated, internal bead requirement as agreed
- Application: heating element, cartridge heater, heat exchanger, condenser, evaporator, refrigeration, appliance heating or fluid line
- Testing: eddy current, hydrostatic, pneumatic, PMI, mechanical test, internal cleanliness or special inspection as required
- Packing requirement: bundle, wrapping, tube end protection, wooden case or customized export packing
- Destination port or delivery address
- Required documents: MTC, inspection report, certificate of origin, packing photos, test records or other documents as required or as agreed
- For EU shipments: please mention if CBAM reporting support or product carbon footprint data is required
Stainless Steel Welded Tube Supplier in China
Overseas buyers may search for stainless steel welded tube manufacturer in China, stainless steel welded tube supplier, ASTM A249 welded tube supplier or 316L welded tube for heat exchanger. GAOFA TECH supports these inquiries as a factory-direct export partner and supply partner, helping buyers clarify specification, condition, inspection and packing before order production.
How We Support Overseas Buyers
- Review grade, tube size, standard and condition before quotation
- Clarify tube or pipe wording to avoid wrong standard selection
- Discuss heating element, heat exchanger, condenser and evaporator application details
- Confirm inspection, packing and supporting documents as required or as agreed
Quotation Focus
- Material grade and ASTM / EN / JIS / customer standard
- OD, wall thickness, tolerance, length and quantity
- As welded, fully annealed or polished condition
- Weld seam, internal condition, straightness and packing requirements
Send Your Stainless Steel Welded Tube Requirement
Please send your grade, standard, OD, wall thickness, length, quantity, condition, weld seam requirement, inspection requirement and application. GAOFA TECH will review feasibility and quotation details based on your specification.
Stainless Steel Welded Tube FAQ
What is a stainless steel welded tube?
A stainless steel welded tube is produced from stainless steel strip or coil. The strip is formed into a tube shape and welded along the longitudinal seam, then processed according to required condition, tolerance, inspection and packing requirements.
What ASTM standards are commonly used for stainless steel welded tubes?
Common ASTM tube standards include ASTM A249 for welded boiler, heat exchanger and condenser tubes, ASTM A269 for general corrosion-resisting tubing, ASTM A554 for mechanical tubing, ASTM A270 for sanitary tubing and ASTM A789 for duplex stainless steel tubing. ASTM A312, A778, A358 and A790 are pipe-related standards and should be used when the RFQ is for welded stainless steel pipe.
What is the difference between ASTM A249 and ASTM A269 welded tubes?
ASTM A249 is commonly used for welded austenitic steel boiler, heat exchanger, superheater and condenser tubes. ASTM A269 is commonly used for general corrosion-resisting and low / high temperature stainless steel tubing. The correct standard depends on application, grade, testing requirement and customer specification.
What is the difference between stainless steel welded tube and seamless tube?
Welded tube is produced from strip or coil and has a longitudinal weld seam. Seamless tube is produced without a welded seam. Welded tube is often economical and dimensionally stable for repeated production, while seamless tube may be required for some pressure service, special forming or end-user specifications.
Can stainless steel welded tube be used for heating elements?
Yes. Stainless steel welded tubes can be reviewed for tubular heating element applications when the design accepts welded tubing. Buyers should specify grade, size, straightness, condition, cut length, internal cleanliness, dryness, tube end protection and packing requirements.
Can stainless steel welded tube be used for cartridge heater sheath tubes?
Small OD stainless steel welded tubes may be reviewed for cartridge heater sheath applications depending on size, tolerance, internal condition, weld seam requirement, surface condition and downstream assembly process. Seamless tube may still be needed if the customer specification requires it.
Can stainless steel welded tube be used for heat exchangers?
Yes. ASTM A249 welded stainless steel tubes are commonly reviewed for heat exchanger, condenser and thermal equipment applications. Material grade, wall thickness, testing, corrosion conditions and pressure requirements should be confirmed before selection.
What condition can GAOFA TECH supply for stainless steel welded tubes?
Stainless steel welded tubes can be reviewed in as welded, fully annealed or polished condition as specified. The required condition should be confirmed according to downstream forming, assembly, appearance, surface and inspection requirements.
Do you supply AP or EP stainless steel welded tubes?
For this stainless steel welded tube page, the main condition descriptions are as welded, fully annealed and polished as specified. If a buyer has a special electropolishing, pickling, roughness or high-cleanliness requirement, it should be discussed as a separate requirement before quotation.
Are you a stainless steel welded tube manufacturer in China?
GAOFA TECH works as a factory-direct export partner and supply partner for stainless steel welded tubes. We help overseas buyers confirm material grade, tube size, ASTM standard, condition, inspection requirement, packing and export documentation before order production.
What information is needed before quotation?
Please provide material grade, standard, OD, wall thickness, length, quantity, condition, weld seam requirement, testing requirement, application and destination. For heating element or cartridge heater use, please also mention internal cleanliness, dryness, straightness, cut length and tube end protection requirements.
Can you provide inspection reports, records or videos?
Inspection reports, test records, packing photos or videos can be prepared as required or as agreed in the purchase specification. Actual testing method, sampling level, acceptance criteria and supporting documents should be confirmed before order production.
Can you provide CBAM data or product carbon footprint data?
GAOFA TECH can provide product carbon footprint data based on third-party verified mill information to support EU CBAM reporting for selected stainless steel products, including stainless steel tubes and stainless steel strips. Availability depends on product type, grade, order details and available mill documentation.
Related Stainless Steel, Titanium and Nickel Alloy Tubes
If stainless steel welded tube is not the most suitable option for your application, GAOFA TECH can also review seamless, coiled, titanium, nickel alloy or enhanced heat transfer tube directions.