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Help CenterSeamless Steel Pipe With 3.1 Inspection Certificate and Warranty 6 Inch Sch 80
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Welcome to Hemaokang Steel (Shandong) Co., Ltd. – your reliable partner for high-quality seamless steel pipes. As a newly established but rapidly growing manufacturer with an annual export value of US$50 million to US$100 million and a dedicated team of 51–100 employees, we are proud to offer the 6 Inch Schedule 80 Seamless Steel Pipe with a 3.1 Inspection Certificate and comprehensive warranty. This product is engineered to meet the most demanding industrial requirements, ensuring superior strength, durability, and safety in high-pressure applications. Our commitment to quality is backed by ISO9001 certification and a global customer base spanning North America, South America, Europe, Asia, Africa, and Oceania.
Our seamless steel pipes are manufactured using advanced hot-rolling or cold-drawing processes, delivering a uniform structure without any weld seams. The 6-inch (DN150) Schedule 80 specification provides a thick wall that can withstand high internal pressures and extreme environments. Each pipe is accompanied by a 3.1 Inspection Certificate (EN 10204 Type 3.1), which documents material traceability, chemical composition, and mechanical properties – giving you full confidence in the product's integrity.
Key Features & Technical Specifications
- Seamless Construction: No welded joints ensure uniform strength and resistance to cracking under pressure cycles.
- Schedule 80 Wall Thickness: Approximately 0.432 inches (10.97 mm) for 6-inch nominal size, providing excellent pressure rating.
- Material Options: Standard carbon steel grades (ASTM A106 Gr.B, A53 Gr.B, API 5L Gr.B) or customized upon request.
- Full Traceability: Each pipe is heat-numbered and tested to meet the 3.1 certificate requirements.
- Surface Finish: Black painted, varnished, or as specified; ends are beveled with plastic caps for protection.
- Length & Dimensional Tolerance: Random length 5.8–6.1 m, or fixed length available; tolerances per ASTM A999.
- Warranty Coverage: 12 months against manufacturing defects, with technical support from our team.
| Parameter | Value |
|---|---|
| Nominal Size | 6 inch (DN150) |
| Schedule | 80 |
| Outside Diameter | 6.625 in (168.3 mm) |
| Wall Thickness | 0.432 in (10.97 mm) |
| Weight per Foot | 28.57 lb/ft (42.56 kg/m) |
| Pressure Rating (ASTM A106 Gr.B) | Approx. 2,890 psi at 100°F (design per ASME B31.3) |
| Certificate | 3.1 per EN 10204 + ISO9001 |
Benefits for Your Business: By choosing our 6-inch Sch 80 seamless pipe, you gain a product that reduces downtime, lowers maintenance costs, and ensures safe operation in high-pressure piping systems. The 3.1 inspection certificate provides independent verification of material quality, which is often required for critical applications in oil & gas, petrochemical, and power generation industries. Our pipes are also suitable for structural applications, water treatment, and mechanical engineering.
Our manufacturing facility in Liaocheng, Shandong, is equipped with modern production lines and rigorous testing equipment. We conduct non-destructive testing (ultrasonic, hydrostatic) on every pipe to ensure zero defects. With a strong export portfolio and a network of satisfied clients across 20+ countries, we guarantee timely delivery and responsive after-sales service.
Why Partner with Hemaokang Steel?
- ISO9001 Certified Quality Management System – ensures consistent product quality and process control.
- Annual Export Value US$50M–US$100M – proven capability to handle large volume orders.
- 51–100 experienced employees dedicated to manufacturing, quality control, and customer service.
- Global Market Presence – serving North America, Europe, Asia, Africa, Oceania, and more.
- Flexible Customization – we can adjust length, coating, end finish, and packaging to meet your specific requirements.
- Competitive Pricing & Short Lead Times – thanks to our efficient supply chain and direct factory production.
Contact us today to request a quotation or to discuss your project needs. Our team is ready to provide technical support, sample testing, and a seamless purchasing experience. Trust Hemaokang Steel for your critical piping requirements – where quality meets reliability.
Frequently Asked Questions (FAQ)
Q1: What does the 3.1 Inspection Certificate cover?
A1: The 3.1 certificate (EN 10204 Type 3.1) provides traceability from the steel mill to the final product. It includes chemical composition, mechanical properties (yield, tensile, elongation), heat treatment details, and test results. It is issued by the manufacturer and verified by an independent inspector.
Q2: What is the exact wall thickness of 6-inch Schedule 80 pipe?
A2: For 6-inch nominal pipe, Schedule 80 wall thickness is 0.432 inches (10.97 mm). The outside diameter is 6.625 inches (168.3 mm). Tolerances per ASTM A999 apply.
Q3: Can you provide custom lengths?
A3: Yes, we offer random lengths (5.8–6.1 m) as standard, but we can also supply fixed lengths (e.g., 6 m, 12 m) upon request. Please specify your requirement when ordering.
Q4: What materials are available besides carbon steel?
A4: Our standard production focuses on carbon steel grades (ASTM A106 Gr.B, A53 Gr.B, API 5L Gr.B). For other materials such as alloy steel or stainless steel, please contact us to discuss availability and lead time.
Q5: What is the warranty period and what does it cover?
A5: We provide a 12-month warranty from the date of shipment against manufacturing defects (e.g., material flaws, dimensional deviation). The warranty does not cover damage caused by improper installation, misuse, or external factors.
Q6: What are the typical delivery times?
A6: For standard sizes and quantities (e.g., 20–50 tons), delivery is usually 15–25 days after order confirmation. Larger orders or custom specifications may require 30–45 days. We will confirm the lead time in the quotation.
Q7: Do you accept small trial orders?
A7: Yes, we welcome small orders for testing and qualification. Minimum order quantity (MOQ) is typically 1 ton for stock sizes, but we can discuss flexibility for first-time cooperation.
Q8: How do you ensure the pipes arrive in good condition?
A8: Each pipe is individually wrapped with plastic caps on both ends, bundled with steel straps, and loaded in containers with proper bracing. For open-top containers, we use waterproof covers if needed. We also arrange cargo insurance for your peace of mind.
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