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Help Center304 Stainless Steel Pipe ASTM A312 Schedule 40 Seamless 2B Finish 1/2 to 12 Inch
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Hemaokang Steel (Shandong) Co., Ltd. is proud to offer premium 304 Stainless Steel Pipe ASTM A312 Schedule 40 Seamless 2B Finish in sizes from 1/2 to 12 inch. As a trusted manufacturer based in Liaocheng, Shandong, China, we specialize in high-quality stainless steel products that meet rigorous international standards. Our pipes are designed for demanding applications where corrosion resistance, strength, and reliability are non-negotiable. With an annual export value exceeding US$100 million and a dedicated team of 51–100 professionals, we ensure every pipe delivers consistent performance and long service life.
This product line is manufactured in strict accordance with ASTM A312 / ASME SA312, the standard specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipe. The Schedule 40 wall thickness provides a robust balance between pressure capacity and weight, making it suitable for a wide range of industrial piping systems. The 2B finish (cold rolled, bright annealed) offers a smooth, reflective surface that is easy to clean and highly resistant to corrosion. All pipes are 100% seamless, eliminating weld defects and ensuring uniform strength throughout the length.
Key Features & Technical Specifications
- Material Grade: 304 Stainless Steel (UNS S30400) – excellent corrosion resistance, suitable for most environments.
- Manufacturing Process: Seamless (hot finished or cold drawn) – no welded seams, superior integrity.
- Surface Finish: 2B (mill finish, bright annealed) – smooth, matte appearance, ideal for moderate to high corrosion resistance.
- Wall Thickness: Schedule 40 (as per ASME B36.10) – standard industrial thickness for pressure applications.
- Size Range: 1/2 inch (DN15) to 12 inch (DN300) – available in both metric and imperial nominal sizes.
- End Connections: Plain end (standard); beveled ends available for welding.
- Length: Standard 6 meters (20 feet) or custom lengths up to 12 meters.
- Certifications: ISO 9001:2015 quality management system.
Dimensional & Pressure Data (Sample)
| Nominal Size (inch) | Outside Diameter (mm) | Wall Thickness (mm) | Weight (kg/m) | Max Working Pressure (MPa)* |
|---|---|---|---|---|
| 1/2" | 21.34 | 2.77 | 1.27 | 17.5 |
| 1" | 33.40 | 3.38 | 2.50 | 14.2 |
| 4" | 114.30 | 6.02 | 16.07 | 9.8 |
| 12" | 323.85 | 10.31 | 79.66 | 6.5 |
* Max working pressure based on ASME B31.3 allowable stress for 304 SS at 100°F (38°C). Actual values may vary with temperature and application. Consult engineering for design.
Advantages & Customer Benefits
- Exceptional Corrosion Resistance: 304 stainless steel offers excellent resistance to a wide range of chemicals, including acids, alkalis, and organic compounds. This ensures long service life in harsh environments like chemical plants, refineries, and water treatment facilities.
- High Strength & Durability: Schedule 40 wall thickness provides robust mechanical strength, capable of withstanding high internal pressures and external loads. The seamless construction eliminates weak points, reducing the risk of leaks or failures.
- Superior Surface Quality: The 2B finish ensures a smooth, non-porous surface that is easy to clean, resists pitting, and maintains aesthetic appeal. It is ideal for sanitary applications (food processing, pharmaceuticals) where hygiene is critical.
- Versatile Sizing: With sizes from 1/2 to 12 inch, this pipe can be used for small-scale instrumentation lines up to large process piping. Custom lengths and end preparations are available to meet specific project requirements.
- Cost-Effective Solution: Compared to higher alloys (e.g., 316L), 304 stainless steel offers excellent value for money without compromising performance for most standard applications. Lower initial cost combined with minimal maintenance leads to reduced total cost of ownership.
- Ease of Fabrication: 304 SS is easily welded, cut, bent, and threaded, allowing for quick installation and modification on site. The material is also compatible with standard fittings and flanges.
At Hemaokang Steel, we understand that every project is unique. Our team works closely with clients to ensure that the pipe specifications match the exact requirements – from pressure ratings to dimensional tolerances. We also provide third-party inspection reports, mill test certificates, and other documentation upon request to guarantee traceability and quality.
Why Choose Hemaokang Steel?
Hemaokang Steel (Shandong) Co., Ltd. was established in 2025, yet we have quickly built a reputation for reliability and excellence in the global steel market. Our annual export value ranges from US$50 million to US$100 million, serving markets across North America, South America, Europe, Southeast Asia, Africa, Oceania, the Middle East, and beyond. With a skilled workforce of 51–100 employees, we operate a modern facility in Liaocheng, Shandong – a region known for its steel manufacturing expertise.
We are proud to hold ISO 9001:2015 certification, which reflects our commitment to quality management and continuous improvement. Every batch of pipes undergoes rigorous testing – including dimensional checks, hydrostatic pressure tests, and chemical composition analysis – to ensure compliance with ASTM A312 and customer specifications. Our professional sales team provides prompt response, competitive pricing, and flexible shipping solutions (FOB, CIF, CFR, etc.).
Don’t compromise on quality. Whether you need a small quantity for a repair job or a large volume for a major pipeline project, Hemaokang Steel is your reliable partner. Contact us today for a quote or technical consultation. We look forward to building a long-term relationship with you.
Frequently Asked Questions
1. What is the difference between ASTM A312 and ASTM A269?
ASTM A312 covers seamless and welded stainless steel pipe for high-temperature and general corrosive service, with larger sizes and heavier walls. ASTM A269 covers smaller-diameter tubing for heat exchangers and condensers. Our product is ASTM A312, suitable for standard piping systems.
2. Can this pipe be used for potable water systems?
Yes, 304 stainless steel is commonly used in water supply systems due to its corrosion resistance and hygienic properties. However, local codes and water chemistry should be considered. We recommend consulting your local regulations.
3. What is the maximum operating temperature for Schedule 40 304 SS pipe?
304 stainless steel can be used continuously at temperatures up to 870°C (1600°F) in oxidizing atmospheres, but for pressure applications, the allowable stress decreases significantly above 500°C (932°F). Refer to ASME B31.1 or B31.3 for design limits.
4. Do you provide hydrostatic testing and mill certificates?
Yes, we offer hydrostatic testing as standard, and mill test certificates (EN 10204 3.1) can be provided for each batch. Third-party inspection services are also available upon request.
5. How long is the delivery time for a typical order?
For standard sizes and quantities (e.g., 20-50 tons), delivery is usually 15-25 days after order confirmation. Large or custom orders may require 30-40 days. We can expedite based on stock availability.
6. Can I get a sample before placing a bulk order?
Absolutely. We provide samples (courier cost covered by customer, refundable upon bulk order). Please contact our sales team to arrange sample shipment.
7. Is the pipe suitable for high-pressure steam applications?
304 stainless steel can be used for steam service, but the maximum allowable pressure decreases with temperature. Schedule 40 is typically adequate for moderate pressure steam (e.g., up to 150 psi at 366°F). For higher pressures, consider Schedule 80 or 160.
8. What is the packaging standard for export?
Our pipes are packed in bundles with steel straps, covered with waterproof material, or in wooden crates for smaller sizes. We ensure seaworthy packaging to prevent damage during transit.
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