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Tianjin Yuantai Yuanda Pipeline Technology Co., Ltd. (a subsidiary of Tianjin Yuantai Derun Group) has officially achieved full-scale mass production of 4024mm extra-large diameter spiral welded steel pipes. Explore our manufacturing capabilities, global certifications, and flagship project references across water diversion and offshore energy sectors.

Pipe ovality explained: the (Dmax − Dmin) ÷ OD formula, tolerance limits per API 5L and EN 10219-2, the four causes we see on our ERW mills, and a buyer's receiving-inspection checklist.

NPS is not the OD, and schedule is not a pressure rating. Learn how steel pipe size, wall thickness, and schedule work — with charts and formulas.

Black steel pipe straightness isn't precision — ASTM A53 says "reasonably straight" plus a ~0.2% length tolerance. Real runout numbers, ERW concentricity, and when to switch to A500 HSS.

Comprehensive ERW pipe size and weight chart covering NPS 1/2 to 18 inches. View outer diameter, wall thickness (Sch 10 to XXS), and weight per foot/meter for ASTM A53 & API 5L ERW pipes.

Moment of inertia and section modulus explained in plain English, with formulas, property charts for square and rectangular tubes, and worked examples.

Can black iron gas pipe be buried underground? Learn why bare steel corrodes in soil and how coatings, joint protection, and code requirements affect selection.

A hollow section is a closed steel profile designed for structural applications. Learn about SHS, RHS and CHS, how hollow sections are manufactured, the main EN, ASTM and GB/T standards, and how they differ from conventional steel pipe.

Compare EN 10210 & EN 10219 standards to determine whether your project requires RHS steel seamless or not. Read our technical guide.

Can you substitute ASTM A500 for ASTM A501? Discover the crucial differences in manufacturing metallurgy, yield strength, AISC wall thickness calculations, and sub-zero fatigue resistance before making procurement decisions.

Choosing the right zinc coating thickness is essential for your structural steel's longevity. This guide explains how to match coating thickness to your project's exposure environment, with a focus on our high-performance 70μm+ heavy-duty galvanizing for aggressive conditions. Contact Yuantai Derun for technical support and product data for your next project.

In an era of increasing trade remedy scrutiny, EPC project success depends on supply chain resilience. As a lead drafter of the GB/T 6728-2025 standard, Yuantai Derun Group provides global infrastructure projects with "Audit-Ready" compliance documentation. We help EPC contractors build transparent evidentiary chains—from raw material traceability to international certification—to mitigate anti-dumping risks. Secure your structural steel sourcing and ensure seamless project delivery today.

The new GB/T 6728-2025 standard is officially active, replacing the 2017 edition. Authored by drafting participant Yuantai Derun, this guide breaks down core revisions: consolidated 6728+6723 frameworks, new laser cutting & mechanical property requirements, and revised Appendix B tolerances & galvanizing re-inspection rules. Get free PDF downloads of the official Chinese, English, and bilingual texts, plus grade mapping to EN 10219 & ASTM A500.

Compare EN 10255, ASTM A53 & BS 1387 steel pipes. Explore critical differences in dimensional tolerances, threading requirements, and multi-standard mill compliance.