(ISO) 1-100mmx1000-3000mm Q235/304L/316L/409L/Dx53D HRC/CRC Galvanized/Aluminized/Coated/Oiled Automotive Exhaust/Metal Roofing/Structur Steel Plate

• Customization: Available
• After-sales Service: Technical Support and After-Sales Service Ava
• Warranty: Negotiable
• Model NO.: DMT Steel Plate
• Type: Steel Plate
• Standard: ASTM, AISI, GB, JIS, DIN
• Certification: ISO, Mtc
• Surface Treatment: Raw (as-Rolled) / Oiled / Shot Blasted
• Technique: Hot Rolled / Cold Rolled
• Application: Construction, Bridges, Machinery, Shipbuilding
• Special Use: General Structural & Fabrication Use
• Stock: Stock
• Grades: Q195, Q235, Q235B, Q345, ASTM A36, Ss400, S235jr
• Thickness: 4.5mm-200mm
• Width: 1000mm-2800mm (Customizable)
• Length: 2000mm-12000mm, Custom Lengths Available
• Edge Treatment: Mill Edge / Cut Edge
• Thickness Tolerance: Per ASTM A6/A6m / GB/T 709
• MOQ: 5 Tons (or Negotiable)
• Incoterm: EXW, Fob, CIF
• Transport Package: Waterproof Paper,PVC Film,Steel Strapping,Pallets
• Specification: Carbon Steel Plate
• Trademark: DUMAI TUBE
• Origin: China
• HS Code: 7306
• Production Capacity: 50000 Tons/Year

Product Description

 Hot Rolled / Cold Rolled Carbon Steel Plate for General Fabrication

Our carbon steel plates are manufactured from high-quality raw materials through advanced hot rolling and cold rolling processes, delivering excellent surface quality, precise dimensional accuracy, and consistent mechanical properties. Available in a wide range of grades including Q195, Q235, Q235B, Q345, ASTM A36, SS400, and S235JR, our plates serve as essential raw materials for construction, bridges, machinery manufacturing, shipbuilding, and general fabrication industries.

Specification

Material	Q195, Q235, Q235B, Q345, ASTM A36, SS400, S235JR
Standard	ASTM A463/A463M Type 1, JIS G3314, EN 10169, GB/T 14978; also complies with ASTM A924/A924M
Thickness	4.5mm – 200mm (Hot Rolled) / 0.2mm – 6.0mm (Cold Rolled)
Width	1000mm – 2800mm (Standard: 1500mm, 2000mm, 2500mm)
Length	2000mm – 12000mm, Custom Lengths Available
Edge	Mill Edge / Cut Edge
Flatness	Per ASTM A6/A6M / GB/T 709
Thickness Tolerance	Per ASTM A6/A6M / GB/T 709
Mechanical Properties	Grade dependent — Q235B: ≥235MPa (≤16mm); ASTM A36: ≥250MPa; S355JR: ≥355MPa (≤16mm)
Surface	As-Rolled, Oiled, Shot Blasted, or as per customer requirement
Incoterm	EXW, FOB, CIF or as negotiated
Packaging	Waterproof paper + PVC/laser film + Metal edge protectors + Steel strapping + Wooden pallets (ISPM 15 compliant)
Lead time	Approx. 25 - 45 days after the first deposit.
Port of Shipment	Shanghai port, Qingdao Port, Ningbo Port, Tianjin Port.

Applications

Our carbon steel plates are widely used across multiple industries due to their excellent strength, weldability, formability, and cost-effectiveness.

Construction & Infrastructure
Building structures, steel frameworks, high-rise buildings, bridges, stadiums, industrial plants.

Machinery Manufacturing

Equipment frames, machine bases, heavy machinery components, agricultural machinery.

Shipbuilding

Hull structures, deck plates, bulkheads, marine components.

Automotive & Transportation

Truck frames, chassis components, railway cars, trailers.

General Fabrication

Tanks, industrial equipment, metal structures, custom fabrication.

Key Advantages	Benefit
Excellent Weldability	Easy to weld without preheating for most grades
Good Formability	Supports cutting, bending, drilling, and stamping
High Strength Options	Q345/S355JR offers superior strength for heavy-duty applications
Cost-Effective	Best price-to-performance ratio for structural applications
Wide Availability	Multiple grades and sizes available

Key configurations

Grades: Q195, Q235, Q235B, Q345, ASTM A36, SS400, S235JR
Standard: ASTM A6/A6M, GB/T 709, JIS G3101, EN 10025
Thickness: 4.5mm – 200mm (Hot Rolled) / 0.2mm – 6.0mm (Cold Rolled)
Width: 1000mm – 2800mm (Standard: 1500mm, 2000mm, 2500mm)
Length: 2000mm – 12000mm, Custom Lengths Available
Edge: Mill Edge / Cut Edge
Surface: As-Rolled, Oiled, Shot Blasted, or as per customer requirement

Mechanical Properties (Grade Dependent):

Q235B (≤16mm): Yield ≥235 MPa; Tensile 370–500 MPa
ASTM A36: Yield ≥250 MPa; Tensile 400–550 MPa
S355JR (≤16mm): Yield ≥355 MPa; Tensile 470–630 MPa

All products are manufactured and tested in accordance with ASTM A6/A6M, GB/T 709, JIS G3101, and EN 10025 standards to ensure consistent quality, precision, and performance. Mill Test Certificate (EN 10204 Type 3.1) provided with every shipment.

Raw material selection

Our carbon steel plates are produced from high-quality steel slabs sourced from reputable mills, conforming to ASTM A6/A6M, GB/T 709, JIS G3101, and EN 10025 standards. The base material is available in multiple grades — including Q195, Q235, Q235B, Q345, ASTM A36, SS400, and S235JR — each selected based on specific strength, formability, and weldability requirements. Strict incoming material inspection ensures chemical composition, surface quality, and dimensional accuracy meet applicable standards before production begins. Only fully killed steel with controlled inclusion content is selected to ensure excellent formability, weldability, and structural integrity. Material test certificates (EN 10204 Type 3.1 or 3.2) are available upon request.

Technical Specifications

Our hot rolled / cold rolled carbon steel plates are manufactured in compliance with ASTM A6/A6M, GB/T 709, JIS G3101, and EN 10025 standards, offering excellent strength, weldability, and formability for construction, machinery, shipbuilding, and general fabrication applications.

Popular Sizes

Other thicknesses, widths, and lengths available upon request.

Thickness	Width	Length	Application
4.5mm	1500mm	6000mm	Construction, general fabrication
6.0mm	1500mm	6000mm	Building structures, machinery parts
8.0mm	2000mm	6000mm	Bridges, heavy machinery
10.0mm	2000mm	8000mm	Shipbuilding, heavy structures
12.0mm	2500mm	8000mm	Pressure vessels, heavy equipment
16.0mm	2500mm	10000mm	Heavy structural components

Chemical Composition

Our carbon steel plates are manufactured from high-quality steel slabs conforming to ASTM A6/A6M, GB/T 709, JIS G3101, and EN 10025 standards. The chemical composition varies by grade — typical ranges for key elements are as follows.

Element	Q235B (%)	ASTM A36 (%)	SS400 (%)	S355JR (%)
Carbon (C)	≤ 0.20	≤ 0.25 – 0.29	≤ 0.17 – 0.22	≤ 0.24
Manganese (Mn)	≤ 1.40	0.80 – 1.20	≤ 1.40	≤ 1.60
Silicon (Si)	≤ 0.35	≤ 0.40	≤ 0.50	≤ 0.55
Phosphorus (P)	≤ 0.045	≤ 0.040	≤ 0.035 – 0.050	≤ 0.035
Sulfur (S)	≤ 0.045	≤ 0.050	≤ 0.035 – 0.05	≤ 0.035

Mechanical Properties

The mechanical properties of carbon steel plates are determined by the base material grade and thickness. The following table provides the typical values for each grade — please note that actual values may vary depending on specific plate thickness and processing conditions.

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Characteristics
Q235B	370 – 500	≥ 235 (≤16mm)	≥ 26	General structural steel
Q345B	470 – 630	≥ 345 (≤16mm)	≥ 21	High-strength structural steel
ASTM A36	400 – 550	≥ 250	≥ 20	American standard structural steel
SS400	400 – 510	≥ 245 (≤16mm)	≥ 21	Japanese standard structural steel
S235JR	360 – 510	≥ 235 (≤16mm)	≥ 26	European standard structural steel
S355JR	470 – 630	≥ 355 (≤16mm)	≥ 21	European high-strength structural steel

Certificates & Qualifications

-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.

Packaging & Shipping

Packaging

Shipping

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

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

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.

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