astm a335 Alloy Seamless Steel Pipe

Hot Expanded Seamless Steel Pipe – High-Quality Carbon Steel Tubing for Industrial Applications

Discover premium hot expanded seamless steel pipes—engineered for durability, precision, and cost-effective performance in demanding environments. These pipes are manufactured using advanced thermal expansion techniques that enhance dimensional accuracy while reducing wall thickness efficiently. Ideal for industries requiring large-diameter, thin-walled tubing solutions, this product bridges a critical gap in global supply chains where standard pipe sizes fall short.

Key Features:

• Outer Diameter Range: 6" to 36" (DN15–DN1200)
• Wall Thickness: 4mm to 40mm (SCH10 to SCH160 available)
• Material: Seamless carbon steel, suitable for high-pressure and structural applications
• Standards Compliance: ASTM, API, EN, DIN, GB, BS — globally recognized specifications
• Surface Finishes: Black painted, anti-rust oil, hot galvanized, cold galvanized, or 3PE coating options
• Production Capacity: Up to 30,000 metric tons per month
• Delivery Time: Approximately 20 days after deposit or L/C at sight

The hot expansion process involves heating the base pipe and then applying controlled mechanical force to increase diameter while simultaneously reducing wall thickness. This method ensures consistent material properties, minimal waste, and superior dimensional stability compared to traditional rolling methods. The resulting seamless carbon Steel Pipe offers enhanced strength-to-weight ratios, making it ideal for use in oil and gas pipelines, construction frameworks, steam systems, and fluid transport networks across various sectors including energy, infrastructure, and manufacturing.

This technology has evolved significantly over recent years, especially with improvements in thermal processing equipment and real-time parameter control systems. While domestic production standards continue to mature, international collaboration remains essential to refine quality benchmarks further—ensuring these pipes meet evolving global engineering expectations.

Common applications include low-to-medium pressure fluid conveyance, coal gas transmission, heating systems, structural supports in heavy-duty projects, and pressurized pipelines for petroleum and natural gas distribution. Whether you're sourcing for industrial fabrication, civil engineering, or offshore installations, this seamless steel tube provides reliable performance under varying operational conditions.

Users report excellent consistency in dimensions, ease of welding, and corrosion resistance when properly coated. Many appreciate the flexibility in customization—whether it’s adjusting wall thickness for specific load requirements or selecting surface treatments based on environmental exposure. The ability to produce non-standard, custom-sized tubes economically makes this solution particularly attractive for specialized projects worldwide.

Frequently Asked Questions:

What is the difference between hot expanded seamless steel pipe and conventional seamless pipe?

Hot expanded seamless steel pipe undergoes an additional thermal treatment step that increases outer diameter while reducing wall thickness uniformly. This allows for efficient production of large-diameter, thin-walled tubes without compromising structural integrity—a key advantage over traditional cold-rolled or extruded methods.

Can I request custom lengths or coatings?

Yes, we offer tailored length options from 2 to 12 meters depending on client needs. Surface finishes such as anti-rust oil, galvanization, or multi-layered 3PE protection can be applied based on project-specific environmental demands.

Is this product compliant with international standards?

Absolutely. Our seamless carbon steel pipes adhere to major global standards including ASTM A106, API 5L, EN 10216, DIN 2448, and others—ensuring compatibility with international engineering practices and regulatory frameworks.

Product Categories : Steel Pipe > Seamless Steel Pipe