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Help CenterASTM A312 TP304 Seamless Stainless Steel Pipe Sch10 Sch40 1/2in-12in Chemical Industry
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What Is Stainless Steel Pipe & Tube？
Product Definition：
Stainless steel pipes and tubes are hollow, long-length products manufactured from stainless steel through seamless (extruded from solid billet) or welded (roll-formed and welded) processes. The material contains a minimum of 10.5% chromium, which forms a passive oxide layer providing excellent corrosion resistance across a wide range of environments.
Pipe vs Tube – Key Differences：
| Parameter | Pipe | Tube |
|---|---|---|
| Dimension Measurement | Nominal Pipe Size (NPS) + Schedule (wall thickness) | Exact OD (outer diameter) + wall thickness |
| Shape | Round only | Round, square, rectangular, oval |
| Typical Applications | Fluid transport (water, gas, oil, steam) | Structural, heat exchangers, instrumentation, precision applications |
| Manufacturing Focus | Pressure rating and flow capacity | Dimensional accuracy and surface finish |
| Common Standards | ASTM A312 (seamless/welded) | ASTM A213 (seamless), A269 (welded) |
Note： In common trade language, “pipe” and “tube” are often used interchangeably. We supply both – please specify your required standard.
Key Characteristics：
| Feature | Description |
|---|---|
| Corrosion Resistance | Excellent resistance to rust, pitting, crevice corrosion, and stress corrosion cracking (grade dependent) |
| High Strength | Good mechanical properties with moderate weight |
| Hygienic | Smooth internal surface – no bacterial adhesion. Ideal for food, beverage, and pharmaceutical industries |
| Heat Resistance | Many grades (304H, 321, 310S) perform well at elevated temperatures |
| Cryogenic Toughness | Austenitic grades (304, 316) maintain toughness down to -196°C |
| Formability | Can be bent, flared, expanded, and welded using standard methods |
| Low Maintenance | Long service life with minimal upkeep |
| 100% Recyclable | Environmentally friendly with no loss of properties |
Classification by Manufacturing Method：
| Type | Manufacturing Process | OD Range | Wall Thickness Range | Key Features |
|---|---|---|---|---|
| Seamless Pipe | Extruded from solid billet, then cold drawn/rolled | 6 – 610 mm | 0.5 – 40 mm | No weld seam, uniform wall, higher pressure rating |
| Welded Pipe | Roll formed from strip + welded (ERW, EFW, LASER) | 6 – 2500 mm | 0.5 – 25 mm | Cost-effective, longer lengths available |
| Cold Drawn Tube | Cold drawn from welded or seamless mother tube | 3 – 200 mm | 0.5 – 15 mm | Tight tolerances, smooth surface, precision applications |
| Decorative Tube | Welded + polished | 6 – 200 mm | 0.3 – 3.0 mm | Decorative finish (No.4, HL, Mirror), lower cost |
Typical Applications by Industry：
| Industry | Applications | Recommended Grades |
|---|---|---|
| Oil & Gas | Downhole tubing, flow lines, gathering lines, wellhead equipment | 316L, 2205, 904L |
| Chemical Processing | Process piping, heat exchanger tubes, reactor coils | 316L, 317L, 904L |
| Food & Beverage | Sanitary tubing, dairy lines, brewery piping | 304L, 316L (sanitary finish) |
| Pharmaceutical | Sterile process lines, pure water systems | 316L (electropolished) |
| Marine & Offshore | Seawater piping, platform structures | 316L, 2205, 2507 |
| Power Generation | Boiler tubes, superheater tubes, condenser tubes | 304H, 321H, 310S |
| Heat Exchangers | Shell and tube heat exchangers, condensers, evaporators | 304, 316, 321 |
| Desalination | High-pressure piping, evaporator tubes | 316L, 2205, 2507 |
| Construction | Handrails, scaffolding, structural supports | 304, 316L |
| Automotive | Exhaust systems, fuel lines, hydraulic lines | 304, 409, 316L |
| Instrumentation | Control lines, impulse lines, capillary tubing | 304, 316, 316L |
| HVAC & Refrigeration | Refrigerant lines, heat exchanger coils | 304, 316L |
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.
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