GB/T 6728-2025 Standard Guide | Full Technical Overview, Key Updates & Download Resource

GB/T 6728-2025 is the latest Chinese national standard for cold-formed structural steel sections, officially implemented on March 1, 2026.

Yes, our name appears in the official drafting committee list.Open up the official GB/T 6728-2025 document, skip to the preamble page, and look at the drafting committee. Tianjin Yuantai Derun Steel Pipe Manufacturing Group Co., Ltd. is right there, black on white.

We aren't just a mill that reads the rules; we are the ones who helped write them.

Tianjin Yuantai Derun Pipe Manufacturing Group Co., Ltd. participated in the drafting of GB/T 6728-2025 as one of the contributing manufacturers in China’s structural steel industry standard revision process.

Why should you care? Because during the multi-year drafting phase, our engineers didn't just sit in an office. We took actual fabrication data from our million-ton square and rectangular tube lines, combined it with real-world feedback from international job sites, and fought to bridge the gap between Chinese domestic manufacturing and western engineering codes like EN 10219 or ASTM A500. We pushed for tighter, more practical metrics because we know how frustrating it is when a delivered batch doesn't fit the weld prep on site.

This 2025 update is a major structural overhaul. The committee did something long overdue: they merged the old GB/T 6728 (structural hollow sections) and GB/T 6723 (cold-formed open profiles) into one unified framework.

To give you a clearer picture without making you read through the entire regulatory textbook, our engineering team put together this quick, no-nonsense comparison table based strictly on the revised official clauses:

Overall, the revision introduces tighter dimensional control and broader technical coverage.

How to Match Your Specifications？When your overseas client sends over a drawing specified in European or American standards, your technical team needs to map those chemical and mechanical properties instantly. The 2025 edition streamlines this cross-referencing process.

Here is the quick-lookup material mapping table we use internally at Yuantai Derun to guide international EPC bids:

Let's look at the real data that everyone is searching for. Under the old 2017 text, the tolerance window for cold-formed welded tubes was broader, which occasionally led to discussions during third-party inspections at the port.

Beyond the dimensional tighter limits in Appendix B, GB/T 6728-2025 reshapes how material compliance is documented for global markets. If you are bidding for a high-stakes infrastructure contract, your material submittal package needs to look as professional as your engineering blueprints. 

The updated requirements place greater emphasis on consistent material verification and supporting inspection records.For every batch of hollow sections produced under the new code, the MTC includes verifiable chemical heat analysis and specific mechanical test data that can be cross-verified instantly. 

When preparing your technical presentation for overseas consultants, don’t just send a generic catalog. Pair the English reference translation with your batch MTC data.This can help reduce additional review requests or repeated material verification.

Finding official, clean copies of Chinese technical regulations online is usually a nightmare of paywalls and sketchy links. Because we helped draft this code, Yuantai Derun has made the technical reference files open-access for global engineers and trade partners. 

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