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Help CenterASTM A312 Carbon Steel Round Pipe Seamless Welded OD 21-660mm for Chemical Fluid Transportation Piping
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What Is Carbon Steel Pipe & Tube？
Product Definition：
Carbon steel pipe is a hollow, cylindrical long product manufactured from carbon steel billets or strips through seamless (extruded from solid billet) or welded (roll-formed and welded) processes. With carbon as the primary alloying element (typically 0.06-0.50%), carbon steel pipe offers an excellent balance of strength, ductility, weldability, and cost-effectiveness – making it the most widely used material for fluid transport, structural applications, and mechanical components worldwide--4.
Round Pipe vs Other Shapes：
| Feature | Round Pipe | Square/Rectangular Pipe |
|---|---|---|
| Cross-section | Circular | Square / Rectangular |
| Pressure Resistance | Excellent (uniform stress distribution) | Good |
| Fluid Flow | Excellent (low friction loss) | Moderate |
| Structural Applications | Piping systems, scaffolding, columns | Frames, structures, supports |
| Typical Standards | ASTM A53, A106, API 5L | ASTM A500, EN 10219 |
Key Characteristics：
| Feature | Description |
|---|---|
| High Strength | Tensile strength from 330–600+ MPa depending on grade |
| Excellent Weldability | Suitable for arc welding, gas welding, and resistance welding |
| Good Formability | Can be bent, flared, expanded, and fabricated |
| Cost-Effective | Most economical choice for piping and structural applications |
| Wide Size Range | OD from 6mm to 1200mm, wall thickness from 1mm to 150mm |
| Pressure Rated | Available in schedules SCH10 through SCH160 for various pressure requirements |
| 100% Recyclable | Environmentally friendly with no loss of properties |
Carbon Steel Pipe vs Stainless Steel Pipe：
| Factor | Carbon Steel Pipe | Stainless Steel Pipe |
|---|---|---|
| Cost | Low (baseline) | High (3-5x carbon steel) |
| Strength | Good (205–550+ MPa yield) | Moderate to high |
| Corrosion Resistance | Poor – requires coating/painting | Excellent – natural passive layer |
| Weldability | Excellent | Good |
| Applications | Structural, fluid transport, oil & gas, machinery | Corrosion-resistant, food, chemical |
Typical Applications by Industry：
| Industry | Applications | Recommended Grades |
|---|---|---|
| Oil & Gas | Pipeline transport, wellhead equipment, flow lines, casing & tubing | API 5L Gr.B/X42/X52, A106 Gr.B |
| Construction & Infrastructure | Scaffolding, structural supports, piles, building frames, bridges | Q235, Q355, A53 Gr.B, S235JR, S355JR |
| Chemical & Petrochemical | Process piping, heat exchangers, reactors, pressure vessels | A106 Gr.B, 20#, Q345R, A333 Gr.6 |
| Power Generation | Boiler tubes, superheater tubes, steam lines, condenser tubes | A106 Gr.B/C, A192, A210, 20G, 15CrMo |
| Water & Wastewater | Water supply lines, sewage systems, irrigation | Q235, A53 Gr.B, galvanized pipe |
| Machinery Manufacturing | Hydraulic cylinders, machine frames, conveyor rollers, shafts | 20#, 45#, 1045, STKM13A |
| Automotive | Exhaust systems, chassis components, fuel lines | Q235, A53, 1020, 1045 |
Key Specifications – Carbon Steel Round Pipe / Tube
General Specifications：
| Parameter | Specification / Range | Remarks |
|---|---|---|
| Product Type | Seamless / ERW (Electric Resistance Welded) / LSAW (Longitudinal Submerged Arc Welded) / SSAW (Spiral Submerged Arc Welded) | – |
| Standards (ASTM) | ASTM A53 (general/structural), ASTM A106 (high temp), ASTM A333 (low temp), ASTM A179/A192/A210 (boiler), API 5L (line pipe) | --12 |
| Standards (GB/T) | GB/T 8163 (fluid), GB/T 8162 (structure), GB/T 5310 (high pressure boiler), GB/T 6479 (fertilizer equipment), GB/T 9948 (petroleum cracking) | -5-11 |
| Standards (EN/DIN) | EN 10216 (seamless pressure), DIN 1629/2391 (seamless structural), DIN 17175 (high temp) | -12 |
| Steel Grades – Structural | Q195, Q215, Q235A/B/C/D, Q275, Q355B/C/D/E, A36, SS400, S235JR, S275JR, S355JR | --5 |
| Steel Grades – Fluid/Mechanical | 10#, 20#, 35#, 45#, 1020, 1045, A106 Gr.A/B/C, A53 Gr.A/B, API 5L Gr.B/X42/X52/X60/X70 | -4- |
| Steel Grades – Boiler/Pressure | 20G, 15MoG, 15CrMoG, 12Cr1MoVG, A192, A210, P11/P22/P91, T11/T22/T91 | -11-12 |
| Outer Diameter (OD) | 6 mm – 1200 mm (1/8″ – 48″) | -11-12 |
| Wall Thickness (WT) | 1.0 mm – 150 mm (SCH10 – SCH160, STD, XS, XXS) | -12- |
| Length | 3m, 4m, 6m, 9m, 12m, or custom cut | SRL/DRL available-11 |
| Pipe Schedule | SCH10, SCH20, SCH30, SCH40 (STD), SCH60, SCH80 (XS), SCH100, SCH120, SCH140, SCH160, XXS | -5- |
| End Finish | Plain ends, Beveled ends (for welding), Threaded, Grooved | – |
| Surface Treatment | Black (mill scale), pickled & oiled, galvanized, painted (primer) | See Screen 8 |
| Density | 7.85 g/cm³ | – |
| Testing | Chemical analysis, tensile, hardness, flattening, flaring, hydrostatic, eddy current (ECT), UT (optional) | Mill cert EN 10204 3.1 |
| Packaging | Bundled with end caps, steel straps, wooden pallet / wooden case | Seaworthy, ISPM 15 |
Wuxi Yansheng Technology Co., Ltd. – Company Profile
Wuxi Yansheng Technology Co., Ltd. is a comprehensive technology enterprise specializing in high-quality metal raw material supply and precision processing services. Located in Wuxi City, a major steel distribution center in China, the company leverages the mature industrial chain advantages of the Yangtze River Delta region to provide professional material solutions to global customers.
As a technology-driven enterprise, Yansheng Tech maintains strategic cooperation with several well-known steel mills (such as TISCO, Baosteel, JISCO, Dongfang Special Steel, etc.) and is an authorized distributor of these mills. Our main products include stainless steel (304/316/BA/EP pipe), carbon steel, silicon steel, copper, aluminum and other materials in the form of sheets, pipes, coils, as well as custom-processed parts.
Core Business Highlights:
Material Supply: We maintain sufficient stock inventory, offering 304/316 stainless steel sheets, pipes, coils, API 5L casing, electrical steel, and more. We also accept orders for special steel grades and non-standard specifications.
Precision Processing: Equipped with imported mirror polishing machines, water jet cutting machines, high-precision slitting/leveling lines, large CNC milling machines, boring machines, and more. We provide customized services including BA/EP pipe finishing, medium plate polishing, matte finishing, embossing, plasma cutting, etc.
Main Applications: Our products are widely used in industries such as solar energy, pressure vessels, boilers, electric heating equipment, petrochemicals, environmental protection machinery, pharmaceutical and food processing, and new energy vehicles.
Our processing center is located in Xishan District, Wuxi City, covering nearly 10,000 square meters, with an experienced technical and service team. We adhere to the business philosophy of "Technology First, Quality Oriented, Service Supreme" , providing 24/7 warehousing and logistics support as well as comprehensive after-sales service. Yansheng Tech is committed to being your trusted long-term partner.
Frequently Asked Questions (FAQ)
Q1. What products do you mainly supply?
We mainly supply stainless steel (304/316/BA/EP pipes), carbon steel, silicon steel, copper, aluminum, and other materials in sheets, pipes, and coils. Customized processing services are also available.
Q2. Do you have stock available?
Yes, we maintain sufficient stock for most standard specifications. For non-standard sizes, we can accept orders with reasonable lead time.
Q3. Can you provide MTC (Mill Test Certificate)?
Yes, we provide MTC for every shipment. Third-party inspection (SGS, TÜV, BV, etc.) is also available upon request.
Q4. Do you support video inspection before shipment?
Yes, we fully support video inspection. You can also arrange an agent or third party to visit our factory for on-site inspection before shipment.
Q5. What are your main export markets?
We export to Southeast Asia, the Middle East, Europe, Africa, and South America. We have rich experience in international trade and export documentation.
Q6. What payment terms do you accept?
We accept T/T (wire transfer), L/C at sight (irrevocable), and sometimes a combination of T/T deposit + L/C balance. Payment terms are negotiable based on order size and customer history.
Q7. Can you provide samples?
Yes, samples are available for most standard products. For custom sizes, we may need to produce small batch samples. Sample cost and shipping are usually borne by the customer, but can be discussed.
Q8. What is your typical lead time?
For stock items: 7–10 days after order confirmation. For custom production: 20–30 days, depending on the specification and quantity.
Q9. What quality certifications do you have?
We provide MTC with every shipment. Our partner mills are ISO9001 certified. We can also assist with third-party inspections (SGS, TÜV, BV) upon request.
Q10. How can I get a quotation?
Please send us your material grade, specification (size, thickness, length), quantity, and preferred trade term (FOB, CIF, DAP, etc.). We will reply with a detailed quotation within 24 hours.
Send Inquiry to This Supplier
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