10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural

  • Audited Supplier
  • 1 yr

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Product Highlights

  • Customizable Dimensions: OD 6mm-800mm, Wall Thickness 0.5mm-60mm, and Lengths up to 12m available upon request.
  • Comprehensive Testing: 100% non-destructive testing (hydrostatic/eddy current) with EN 10204 Type 3.1 MTC provided.
  • Multiple Manufacturing Processes: Available via hot rolling or cold drawing to ensure high dimensional accuracy and uniform wall thickness.
  • Versatile Surface Finishes: Options include raw, polished, and chrome plated to meet diverse application needs.
  • Extensive Processing Services: Includes cut to length, bending, end forming, perforating, and TIG/MIG welding.
  • ISO 9001 Certified Quality: Quality management system certified to ISO 9001:2015 ensuring consistent product quality.
  • Global Shipping Capability: Fast delivery from Shanghai, Qingdao, or Tianjin ports with flexible Incoterms (FOB, CIF, EXW).

Product Images of 10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural

10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural pictures & photos
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural pictures & photos
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural pictures & photos
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural pictures & photos
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural pictures & photos
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural pictures & photos
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
  • 10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
  • 10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
    10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
  • 10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
    10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
  • 10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
    10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
  • 10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
    10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
  • 10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
    10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
  • 10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
    10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural

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Product Description

ASTM A106 / A53 Seamless  Steel Tube
Our seamless steel tubes are made from mainstream materials: 20#, 45#, Q345B, 42CrMo, 304, 316L, 321, etc. Processes: hot rolling, cold rolling, cold drawing. Surface treatments: pickling, phosphating, bright annealing, polishing, honing. Standards: GB/T8163, GB/T3639, ASTM A106, ASTM A53, ASTM A269. Sizes: OD 6-720mm, WT 1-100mm. Available grades: grades A, B, and C (ASTM A106) and Gr.A, Gr.B (ASTM A53). Features: high dimensional accuracy, uniform wall thickness, stable mechanical properties. Applications: fluid transportation, boilers, heat exchangers, hydraulic cylinders, instrumentation, oil and gas, structural engineering. Customization available.
Specification
Material
20#, 45#, Q235B,304L, 316L, 321,42CrMo,etc.
Standard
ASTM A106, ASTM A53, GB/T 8163, GB/T 3087; MTC provided upon request 
Outside Diameter
6mm – 720mm
Wall Thickness
1mm-100mm
Length
5.8m, 6m, 9m, 11.8m, 12m(Customized Length Available)
Surface
Raw, polished, chrome plated, etc. 
Incoterm 
EXW, FOB, CIF
Packaging 
Tubes will be packed in bundles according the size and length, protected with plastic/woven bag, loaded on fumigation-free wooden pallets or wooden cases. 
Processing Services
Cut to Length, Bending, End Forming (Flaring / Swaging / Flanging), Perforating, TIG/MIG Welding,etc.
Lead time 
Approx. 20 - 45 days after the first deposit. 
Port of Shipment
Shanghai port, Qingdao Port, Tianjin Port.
Applications
Our seamless steel tubes are available in carbon steel, alloy steel, and stainless steel, including mainstream grades such as 20#, 45#, Q345B, 42CrMo, 304/316L, 321. They are widely used across multiple industries due to their seamless construction, high strength, and reliable performance under high temperature and high pressure.
Key applications include oil and gas pipelines, refinery equipment, boiler tubes, steam lines, heat exchangers, hydraulic cylinders, instrumentation, and structural components in construction and automotive industries. Grade options such as ASTM A106 Grades A, B, and C, ASTM A53 Gr.A and Gr.B, and 20# allow flexible selection based on specific project requirements.
Processes: hot rolling, cold rolling, cold drawing. Surface treatments: pickling, phosphating, bright annealing, polishing, honing.
Standards: GB/T8163, GB/T3639, ASTM A106, ASTM A53, ASTM A269
Key Configurations
Process: Hot Rolled / Cold Drawn (Seamless)
Material: Carbon Steel, Alloy Steel, Stainless Steel
Grades: 20#, 45#, Q345B, 42CrMo, 304/316L, 321; ASTM A106 grades A, B, and C; ASTM A53 Gr.A, Gr.B
Size: OD 6–800 mm, WT 0.5–60 mm (SCH10–SCH160, STD, XS, XXS)
Length: 4.8–12.5 m (SRL / DRL / Fixed Length)
Ends: Plain / Beveled, with plastic caps
Tolerance: Per ASTM A106 / A53
Mechanical Properties: A106/A53 Gr.B: Tensile ≥415 MPa, Yield ≥240 MPa; 20#: Tensile 410–550 MPa, Yield ≥245 MPa
Services: Cut to Length, Threading, Beveling, Bending, Heat Treatment, Surface Treatment
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
Raw material selection
Our seamless carbon steel tubes are produced from high-quality carbon steel billets sourced from reputable mills, in accordance with ASTM A106 and ASTM A53. The raw material is mainly killed or semi-killed carbon steel, made through open-hearth, basic oxygen, or electric furnace processes, with continuous casting of round billets as the standard method. The billets are heated to approximately 1200°C, then pierced and hot rolled or cold drawn to final tube dimensions.
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural



Technical Specifications
Manufacturing Standards
Our seamless carbon steel tubes are manufactured in full compliance with ASTM A106 and ASTM A53. Produced by hot rolling or cold drawing, round steel billets are heated to approximately 1200°C and pierced into hollow shells, then hot rolled or cold drawn to achieve precise dimensions, smooth surfaces, and uniform wall thickness. With no weld seam, they ensure consistent strength and reliability under high-temperature and high-pressure service conditions. Ends are available as plain or beveled, with plastic caps for protection.
Popular Sizes
Other sizes and wall thicknesses available upon request.
OD
WT
Schedule
Typical Application
60.3mm
3.91mm
SCH40 / STD
High-temperature piping
88.9mm
5.49mm
SCH40 / STD
Boiler tubes, steam lines
114.3mm
6.02mm
SCH40 / STD
Refinery, petrochemical
168.3mm
7.11mm
SCH40 / STD
Power plant piping
219.1mm
8.18mm
SCH40 / STD
Heavy industrial piping
Chemical Composition
Our seamless carbon steel tubes are manufactured in compliance with ASTM A106 and ASTM A53 standards. The chemical composition varies by grade — typical requirements for key elements are as follows.
Element
A106 Gr.B (%)
ASTM A53 Grade B
Carbon (C), max
≤ 0.30%
≤ 0.30%
Manganese (Mn)
0.29 – 1.06%
≤ 1.20%
Phosphorus (P), max
≤ 0.035%
≤ 0.035%
Sulfur (S), max
≤ 0.035%
≤ 0.035%
Silicon (Si), min
≥ 0.10%
≥ 0.10%
Chromium (Cr), max
≤ 0.40%
≤ 0.40%
Copper (Cu), max
≤ 0.40%
≤ 0.40%
Nickel (Ni), max
≤ 0.40%
≤ 0.40%
Molybdenum (Mo), max
≤ 0.15%
≤ 0.15%
Vanadium (V), max
≤ 0.08%
≤ 0.08%
Inspection & Testing
All tubes undergo rigorous inspection and testing in accordance with ASTM A106/A53 and applicable standards to ensure full compliance with chemical, mechanical, and dimensional requirements. Each tube is subject to 100% non-destructive testing (hydrostatic or eddy current) prior to shipment, with full Mill Test Certificate (EN 10204 Type 3.1) provided for complete material traceability.
Test
Applicability
Chemical Composition Analysis
All tubes
Tensile Test
All tubes
Hardness Test
All tubes
Flattening Test
All tubes
Flaring Test
All tubes
Hydrostatic Test
All tubes
NDT (Eddy Current or Ultrasonic)
All tubes
Dimensional & Surface Inspection
All tubes
Certificates & Qualifications
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
-All products are supplied with Mill Test Certificate (EN 10204 Type 3.1) for full material traceability and quality assurance.
 
-Our quality management system is certified to ISO 9001:2015 (GB/T 19001-2016) by CNAS-accredited certification body, demonstrating our commitment to consistent product quality, process control, and continuous improvement.
 
-We have been recognized as an Audited Supplier on Made-in-China.com, one of China's leading B2B platforms. This audit confirms our operational excellence, business integrity, and reliable production capabilities — providing our customers with added confidence when doing business with us.
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
Packaging & Shipping
Packaging
Waterproof paper wrapped for moisture protection during ocean transport
Plastic caps on both ends to prevent thread and surface damage
Steel strips or plastic strapping for secure bundling
Wooden crates or pallets (ISPM 15 compliant) for export shipping
Bundles of 50–100 pipes per bundle (varies by diameter and length)
Custom packaging available upon request
Marking: Each bundle or crate is clearly marked with grade and size for easy identification and traceability
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
Shipping
Delivery within 25–45 days after order confirmation. Shipment from Shanghai, Ningbo, Tianjin, or Qingdao ports. 6m pipes load in 20ft containers, 12m in 40ft containers. Trade terms: FOB, CIF, or as negotiated. Full documentation provided including commercial invoice, packing list, bill of lading, MTC, and certificate of origin. Loading photos and on-site container sealing available as value-added services.
After Sales Service
Quality Guarantee: We ensure all products meet high quality standards and maintain transparent communication throughout the process.
Defective Product Refund: If any tube arrives with severe deformation that makes it unusable, client can contact us and we will be finding them solutions.
Price Notification: We proactively notify clients when raw material prices drop to their lowest levels, helping you secure better costs.
Customs Clearance Support: We provide all necessary documentation to ensure smooth and hassle-free customs clearance.
Company Profile
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
Dumai Tube (Shanghai) Co., Ltd.
Founded in 2016, Dumai Tube is an integrated manufacturer and exporter specializing in welded tubes, precision tubular components, and metal processing. Our core products include automotive exhaust pipes, engine manifolds, silencer pipes, car seat skeletons, large-caliber water supply pipes, gym equipment pipes, customized shaped tubes, as well as expanded metal meshes, perforated meshes, and wire mesh components.
 
We are equipped with internationally advanced production facilities, including precision ERW/TIG welding lines, slitting lines, perforating lines, solution annealing furnaces, expanded metal mesh production lines, and complete testing equipment such as eddy current flaw detectors and hydrostatic testing machines. Our manufacturing capabilities cover a wide range of materials — including stainless steel, carbon steel, galvanized steel, aluminum, copper, and various alloy metals — in forms of coils, sheets, plates, and tubes. Product dimensions range from OD 8mm to 219mm and wall thickness from 0.8mm to 3.0mm, with custom lengths to meet diverse project requirements.
 
In 2025, we achieved an annual output of 29,000 tons for tubes, with a maximum annual capacity of 40,000 tons. Our coil and plate products, as well as mesh products, are also available with customizable specifications to suit various applications.
 
Committed to the principle of "Quality First, Customer Foremost", we ensure full traceability through Mill Test Certificates (EN 10204 Type 3.1) with every shipment. All products are manufactured and tested in accordance with international standards such as ASTM A269, EN, GB, or as per customer requirements, with 100% eddy current and hydrostatic testing to guarantee weld seam integrity and product reliability. Surface finishes including raw, polished, and chrome plated are available to meet diverse application requirements.
  
As a factory-direct supplier, we offer competitive pricing, flexible customization, and fast delivery worldwide. Our products are widely used in automotive exhaust systems, automotive seating, construction, fitness equipment, furniture manufacturing, industrial equipment, HVAC, and water supply industries. With a strong focus on quality assurance and customer satisfaction, Dumai Tube is your reliable partner for tube and metal processing solutions.
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
10#/20#/45#/Q235/Q355/42CrMo/304L/316L, Hot Rolled/Cold Drawn, Pickled/Polished/Ba, Seamless Alloy/Stainless/Mild Steel Tube for Fluid Transportation/Structural
Why Choose Us?
Other Products
All products are produced by Dumai Tube. 
Strict quality control and technology innovation ability.
Huge capacity guarantees production on time. 
Professional loading, unloading and transportation guarantee without damage.
Experienced pre-sales and after-sales team provide engineering solution.
Stainless Steel Coils / Strips
Stainless Steel Seamless Tubes
Stainless Steel Square / Rectangular Tubes
Stainless Steel U-Bends / Bends
Stainless Steel Perforated Tubes
FAQ
Frequently Asked Questions:
1. Are you a manufacturer?
Yes, we are a direct manufacturer with two production facilities in China. One plant, located near Shanghai, focuses on stainless steel and aluminized tubes, while the other, in Shandong Province, specializes in mild steel and aluminized tubes.
 
2. Where do you source your raw materials?
We source our raw materials directly from leading steel mills in China to ensure stable quality and full traceability.
Our main suppliers include:
· Stainless Steel: TISCO 
· Aluminized Steel: VAMA (ArcelorMittal joint venture) 
· Mild Steel: Baosteel 
We can also supply 409AL tubes based on project requirements.
 
3. Do your materials comply with international standards?
Yes. Our materials are supplied in accordance with the required chemical composition and mechanical property standards for each grade.
For example:
· AISI 304: produced in full compliance with the relevant chemical and mechanical requirements 
· AISI 409: compliant with required specifications, with tensile strength typically in the range of 360–380 MPa, depending on the material batch 
Material certificates can be provided upon request.
 
4. Do you offer annealed, matte surface, or internal seam treatment?
Our standard production does not include annealing, matte finishing, or internal seam pickling/flattening. However, we use laser welding technology, which results in a very small internal weld bead that generally does not interfere with further processing such as mandrel bending.
If required, we can arrange outsourced services such as:
· Annealing 
· Pickling 
· Other surface treatments 
These services are available at additional cost depending on the specification and order volume.
 
5. Can you provide PPAP documentation?
Yes, we can provide Level 3 PPAP documentation when required.
Each part number can be supplied with its own complete PPAP package, including a duly signed PSW by an authorized representative.
6. What welding processes do you use?
We offer different welding processes depending on the material grade, diameter, wall thickness, and technical requirements.
Available processes include:
· Laser welding 
· TIG welding 
· High-frequency welding 
We select the most suitable process based on the product specification and end-use requirements.
7. Can you supply fixed cut lengths?
Yes, we can supply tubes in fixed lengths according to each part number in order to help reduce scrap and improve production efficiency.
Maximum length depends on product specification and shipping method. For container loading, lengths up to 5,842 mm are feasible for certain applications.
 
8. What packaging options do you offer?
We can provide packaging according to customer requirements.
Common packaging options include:
· Bundled tubes 
· Wrapped protection 
· Lifting slings at both ends for safer unloading 
· Wooden box packaging when required 
Packaging methods can be customized based on product type, transport mode, and unloading conditions.
 
9. What is your minimum order quantity?
MOQ depends on the material grade, size, and production arrangement.
In general, due to minimum steel coil purchasing requirements, the MOQ per size is around 5 tons.
Mixed sizes or mixed codes can be discussed depending on the total order quantity and container arrangement.
 
10. What type of containers can you load?
We can load in different container types depending on product dimensions and customer requirements, including 20' /40HQ. Even Open Top containers where needed.
 
11. Can you provide material certificates and quality documents?
Yes. We can provide relevant quality documents upon request, including:
· Material certificates 
· Mill test certificates 
· PPAP documents 
· Inspection reports 
· Other technical documentation depending on project requirements 
 
12. Can you customize products based on our technical requirements?
Yes. We support customized production based on drawings, specifications, material grade, dimensions, welding method, cut length, packaging, and other technical requirements.
Our team can review your project and recommend the most suitable production solution.
 
13. Can I visit your factory?
Yes, factory visits are welcome. We are happy to arrange a visit to our production facilities by appointment.
Please contact us in advance so we can coordinate the schedule and necessary arrangements.
 
14. How can I get a quotation?
You can send us your inquiry with the following information:
· Material grade 
· Outer diameter and wall thickness 
· Length 
· Surface requirement 
· Quantity 
· Packaging requirement 
· Destination port 
· Drawings or technical specifications, if available 
 

About the Supplier

This supplier has been audited by CTI. Verify the report on the official CTI website with ID "QIP-ASI264410". Items marked "verified" are certified.

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Dumai Tube (Shanghai) Co., Ltd
Dumai Tube (Shanghai) Co., Ltd
Dumai Tube (Shanghai) Co., Ltd
Dumai Tube (Shanghai) Co., Ltd
Dumai Tube (Shanghai) Co., Ltd
Dumai Tube (Shanghai) Co., Ltd
Dumai Tube (Shanghai) Co., Ltd
Dumai Tube (Shanghai) Co., Ltd

About Our Factory & Business Background

Address
Shanghai, China
Average Lead Time
Peak Season Lead Time: 1-3 months
Off Season Lead Time: within 15 workdays

Our Production Capability & Technical Expertise

Main Products
Tube, Pipe, Exhaust System, Stainless Steel, Bends, Manifolds, Coil, Aluminized Tubes, 304 Stainless Steel Tubes, Al409L Tubes

Our Industry Experience & Global Business Record

Main Markets
North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe

FAQ

Are you a manufacturer?
Yes, we are a direct manufacturer with two production facilities in China. One plant, located near Shanghai, focuses on stainless steel and aluminized tubes, while the other, in Shandong Province, specializes in mild steel and aluminized tubes.
Where do you source your raw materials?
We source our raw materials directly from leading steel mills in China to ensure stable quality and full traceability. Our main suppliers include: 1.Stainless Steel: TISCO 2.Aluminized Steel: VAMA (ArcelorMittal joint venture) 3.Mild Steel: Baosteel We can also supply 409AL tubes based on project requirements.
Do your materials comply with international standards?
Yes. Our materials are supplied in accordance with the required chemical composition and mechanical property standards for each grade. For example: 1.AISI 304: produced in full compliance with the relevant chemical and mechanical requirements 2.AISI 409: compliant with required specifications, with tensile strength typically in the range of 360 to 380 MPa, depending on the material batch Material certificates can be provided upon request.
Do you offer annealed, matte surface, or internal seam treatment?
Our standard production does not include annealing, matte finishing, or internal seam pickling/flattening. However, we use laser welding technology, which results in a very small internal weld bead that generally does not interfere with further processing such as mandrel bending. If required, we can arrange outsourced services such as: 1.Annealing 2.Pickling 3.Other surface treatments These services are available at additional cost depending on the specification and order volume.
Can you provide PPAP documentation?
Yes, we can provide Level 3 PPAP documentation when required. Each part number can be supplied with its own complete PPAP package, including a duly signed PSW by an authorized representative.
What welding processes do you use?
We offer different welding processes depending on the material grade, diameter, wall thickness, and technical requirements. Available processes include: 1.Laser welding 2.TIG welding 3.High-frequency welding We select the most suitable process based on the product specification and end-use requirements.
Can you supply fixed cut lengths?
Yes, we can supply tubes in fixed lengths according to each part number in order to help reduce scrap and improve production efficiency. Maximum length depends on product specification and shipping method. For container loading, lengths up to 5,842 mm are feasible for certain applications.
What packaging options do you offer?
We can provide packaging according to customer requirements. Common packaging options include: 1.Bundled tubes 2.Wrapped protection 3.Lifting slings at both ends for safer unloading 4.Wooden box packaging when required Packaging methods can be customized based on product type, transport mode, and unloading conditions.
What is your minimum order quantity?
MOQ depends on the material grade, size, and production arrangement. In general, due to minimum steel coil purchasing requirements, the MOQ per size is around 5 tons. Mixed sizes or mixed codes can be discussed depending on the total order quantity and container arrangement.
What type of containers can you load?
We can load in different container types depending on product dimensions and customer requirements, including 20' /40HQ. Even Open Top containers where needed.
Can you provide material certificates and quality documents?
Yes. We can provide relevant quality documents upon request, including: 1.Material certificates 2.Mill test certificates 3.PPAP documents 4.Inspection reports 5.Other technical documentation depending on project requirements
Can you customize products based on our technical requirements?
Yes. We support customized production based on drawings, specifications, material grade, dimensions, welding method, cut length, packaging, and other technical requirements. Our team can review your project and recommend the most suitable production solution.
Can I visit your factory
Yes, factory visits are welcome. We are happy to arrange a visit to our production facilities by appointment. Please contact us in advance so we can coordinate the schedule and necessary arrangements.
How can I get a quotation?
You can send us your inquiry with the following information: 1.Material grade 2.Outer diameter and wall thickness 3.Length 4.Surface requirement 5.Quantity 6.Packaging requirement 7.Destination port 8.Drawings or technical specifications, if available Our team will review your request and provide a quotation accordingly.

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