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 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 Attributes
- Customization
- Available
- Type
- Round
- Standard
- AISI, ASTM, DIN, JIS, GB
- Model NO.
- DMT Seamless Carbon Steel Tube
- Composition
- 10#/20#/45#/Q235/Q355/42CrMo/304L/316L
- Technique
- Sea
- Shape
- Round
- Surface Treatment
- Raw, Polished, Chrome Plated, etc.
- Outside Diameter (Od)
- 6mm-800mm (Custom Available)
- Wall Thickness (Wt)
- 0.5mm - 60mm (Custom Available)
- Length
- Custom Lengths up to 12m (SRL/DRL/Fixed Length)
- Od Tolerance
- Per ASTM A106/A53
- Wt Tolerance
- ±12.5% (Per ASTM A106/A53)
- Heat Resistance
- High-Temperature Service
- Magnetic Property
- Ferromagnetic
- MOQ
- 3-5 Tons (Negotiable)
- Transport Package
- Wrapped with Plastic in Wooden Pallets
- Specification
- Seamless Steel Tube
- Trademark
- DUMAI TUBE
- Origin
- China
- HS Code
- 7306
- Production Capacity
- 50000 Tons/Year
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
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Product Description
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. |
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





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 |
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% |
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 |

-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.

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



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.




Strict quality control and technology innovation ability.
Huge capacity guarantees production on time.
Professional loading, unloading and transportation guarantee without damage.
Stainless Steel Seamless Tubes
Stainless Steel Square / Rectangular Tubes
Stainless Steel U-Bends / Bends
Stainless Steel Perforated Tubes
About the Supplier
This supplier has been audited by CTI. Verify the report on the official CTI website with ID "QIP-ASI264410". Items marked "" are certified.
Company Profile
Founded in 2016, Dumai Tube is an integrated manufacturer and exporter specializing in welded tubes, precision tubular components, and metal processing. We operate through two plants in China. 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.
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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US$650.00-900.00 / Ton
Product Groups
- Stainless Steel Tubes & Pipes
- Aluminized Steel Tubes & Pipes
- Mild Steel Tubes & Pipes
- Stainless Steel Exhaust Tubes and Bends
- Aluminized Steel Exhaust Tubes and Bends
- Ferritic Stainless Steel Exhaust Tubes and Bends
- Stainless Steel Coils
- Stainless Steel Plates
- Aluminized Steel Coils
- Aluminized Steel Plates
- Mild Steel Coils
- Mild Steel Plates
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