Steel Structure Certifications & Standards Compliance Center
Every certificate below is a project-enabling document: it is what lets a fabricated member clear customs, pass a consultant's audit and carry a warranty in the buyer's jurisdiction — from China's special-grade licenses to the EU's EN 1090 CE marking.
Certifications Are Part of the Deliverable
For a B2B steel structure buyer, a fabrication certificate is not decoration — it is a legal and contractual requirement. In the European Union, load-bearing structural steel cannot legally be placed on the market without CE marking under EN 1090 and its Declaration of Performance. In the United States, projects specify AISC 360 design and AWS D1.1 welding, and many general contractors only accept fabricators working to those frameworks. In China, bidding for any significant steel structure job requires the graded licenses we hold. One manufacturer, four certification worlds: this is the compliance portfolio our engineers navigate daily.
How EN 1090 Is Structured
The EN 1090 series is the European framework for executing and assessing steel and aluminium structures. It has three parts, and understanding the split is essential when you read a supplier's documents:
- EN 1090-1 — requirements for conformity assessment of structural components. This is the CE-marking route: it governs the Declaration of Performance, factory production control (FPC) and the notified-body checks that let a fabricator affix the CE mark.
- EN 1090-2 — technical requirements for the execution of steel structures. Material, fabrication, welding, tolerances, inspection and acceptance are all defined here, organised by execution class (EXC1 to EXC4).
- EN 1090-3 — technical requirements for aluminium structures. Light-gauge alloy facade and cladding support systems fall under this part; conventionally loaded hot-rolled steel members are governed by Part 2.
Execution class is the sentence that decides how much verification a project needs. EXC2 covers ordinary buildings and halls; EXC3 covers structures whose failure would have high consequences — stadiums, long-span roofs, public facilities; EXC4 is reserved for exceptional cases such as nuclear or blast-resistant structures. We execute and document to EXC3 as our standard offering.
What the Chinese Graded Licenses Mean
China regulates construction capability through graded licenses, not just management certificates. Ours are issued under the national qualification system and are checked in every tendering process:
- Steel structure engineering general contracting — Special Grade (特级): the top tier, permitting contracting of any scale, including the 229 m coal shed class of projects.
- Steel structure manufacturing — Special Grade (特级): the fabrication-side licence covering spatial grid, truss, box-section and heavy-plate manufacturing.
- Steel structure design — Grade A (甲级): design authority, so our engineers can sign, seal and stamp structural drawings — the same authority we use for design-build contracts.
These licenses are supplemented by the bolt-sphere grid manufacturing Grade One licence, a niche credential for bolted-sphere spatial grid structures that most fabricators cannot hold. When a Middle East developer asks "who is legally allowed to build a grid roof of this size in your country?", this is the document that answers.
Eight Certifications, One Audit Trail
Each item below states the certificate, its scope and the body behind it. Scanned copies are issued with every quotation; original certificates are available for physical inspection at our Xuzhou base.
Steel Structure Engineering Contracting — Special Grade
Special-grade general contracting license. Scope: steel structure projects of unlimited scale, including long-span spatial structures and multi-storey steel frames. Status: current, renewed per national cycle.
Steel Structure Manufacturing — Special Grade
Special-grade fabrication license issued under the national steel structure qualification system. Scope: grid structures, trusses, box columns, heavy plate fabrication for any project category.
Steel Structure Design — Grade A (甲级)
Class-A special design qualification for light steel structures. Scope: design authority to develop, sign and seal structural designs, giving our design-build contracts a single legal owner.
ISO 9001:2015 Quality Management
Certified by an accredited body; covers design, fabrication, erection and after-sales service of steel structures. Audited annually; the base layer under every QC commitment on this site.
ISO 14001:2015 Environmental Management
Covers the 300-acre production base: shot-blast dust control, coating VOC management, waste metal recycling and energy monitoring. Relevant to buyers with ESG requirements.
ISO 45001:2018 Occupational Health & Safety
Successor to OHSAS 18001. Covers workshops and erection sites, including the fall-protection and wind-limits rules published in our installation guide. Audited annually.
EN 1090 CE Marking — Execution Class EXC3
Factory production control to EN 1090-1 with execution documentation to EN 1090-2 EXC3. Scope: load-bearing structural steel components for the EU market, backed by a Declaration of Performance.
AAA Credit Rating
Top credit rating for construction enterprises, assessed on financial strength, contract performance and litigation record. Required for bonds, performance guarantees and large project bonding.
Chinese Standards → International Equivalents
One of the most frequent confusions in an international steel project is standard mapping: "your Q355B" vs "our S355JR". The table shows the standards we execute to and the international documents we reference to demonstrate equivalence.
| Application | Chinese Standard | International Equivalents |
|---|---|---|
| Structural steel design | GB 50017-2017 | AISC 360-22, EN 1993-1-1 (Eurocode 3) |
| Seismic design of buildings | GB 50011-2010 | ASCE/SEI 7-22, EN 1998-1 |
| Cold-formed steel design | GB 50018-2002 | AISI S100, EN 1993-1-3 |
| Execution & acceptance | GB 50205-2020 | AISC 303-22, EN 1090-2 |
| Welding of steel structures | GB 50661-2011 | AWS D1.1, EN ISO 15614-1 / ISO 3834 |
| Structural steel grades | GB/T 1591-2018, GB/T 700-2006 | EN 10025-2 (S235/S355/S420/S460), ASTM A36/A572/A709 |
| High-strength bolts (10.9S) | GB/T 1228 & GB/T 1231 | EN 14399, ASTM F3125 (A325/A490) |
| Ultrasonic testing acceptance | GB/T 11345-2023 | ISO 17640, AWS D1.1 Table 8.1 |
| Surface preparation (blasting) | GB 8923-2011 | ISO 8501-1 (Sa grades) |
| Corrosion protection of steel | GB/T 30790 series | ISO 12944 (all parts) |
Equivalence is demonstrated by comparing material properties, tolerances and test methods — not by claiming standard numbers are identical. Where a project's specification requires it, we produce a formal equivalence statement signed by our design authority.
Steel Grades We Fabricate & Their Global Equivalents
These are the grades that move through our 200,000-ton production lines. Equivalents are approximate — always confirm Charpy impact requirements and supply condition with the project spec.
Q235B
fy 235 MPa, fu 370–500 MPa. Secondary members, purlins, bracing, light portal frames. Approximate equivalents: S235JR (EN 10025-2), A36 (ASTM), SS400 (JIS).
Q355B
fy 355 MPa, fu 470–630 MPa. The workhorse grade for primary beams and columns. Approximate equivalents: S355JR (EN 10025-2), A572 Gr.50 / A992 (ASTM).
Q420B
fy 420 MPa, fu 520–680 MPa. High-load columns and heavily loaded hybrid sections. Approximate equivalents: S420 (EN 10025-4), A572 Gr.65 class.
Q460C
fy 460 MPa, impact tested at 0 °C (≥ 34 J). Ultra-heavy members and special structures. Approximate equivalents: S460MC / S460N (EN), A709 Gr.65/70 class (limited).
Q355GNH (Weathering)
Atmospheric-corrosion-resistant grade for facades and open structures where painting maintenance is impractical. Approximate equivalents: S355J0WP (EN 10025-5), A588 (ASTM).
Cold-Region Supply
The Antarctic Ross Sea station steelwork ran on low-temperature impact-tested grades with -40 °C Charpy verification — the same material control logic we apply to any cold-climate project, mapped against the client's local code.
As a dual-certification workshop, we can issue material documentation in either system: a Chinese mill certificate per GB/T 1591, an EN 10204 3.1 inspection certificate, or an ASTM-compliant mill test report for the same heat — the buyer's engineer chooses the format the contract requires. For projects that demand Grade A design sign-off, our in-house design institute stamps the shop drawings under GB 50017 before fabrication begins; for EU-destined members the same drawings carry an EN 1090-2 execution-class review. This is why a single consignment can ship with GB, EN and ASTM paperwork without a second round of material qualification, and why a customs or consultant audit typically clears our documentation on the first review.
CE Declaration of Performance & Execution Class EXC3
For buyers placing structural steel on the European market, two documents carry the entire commercial risk of the purchase: the Declaration of Performance (DoP) and the execution class declaration. Here is what ours contain.
The Declaration of Performance (EN 1090-1)
The DoP is the manufacturer's formal statement that a product meets the declared performance, issued under the Construction Products Regulation. Our DoP identifies the product type (hot-rolled welded structural steel components), the harmonised standard applied (EN 1090-1), the execution class (EXC3), and the declared performances: geometric tolerances, component identification through traceable marking, connection types, and the FPC certificate reference. The CE mark on the component carries the notified body number responsible for the factory production control audit, so a customs officer or a site inspector can trace the mark back to an audited factory, not a PDF sent by email. We issue DoPs per consignment, matched to material certificates, so a consignment's paperwork can be checked against each other in minutes.
What EXC3 Actually Requires of a Fabricator
Execution classes in EN 1090-2 run EXC1 to EXC4, and the step from EXC2 to EXC3 changes the verification burden noticeably: every welding procedure must be qualified with a WPQR to EN ISO 15614-1 (a prequalified WPS is no longer enough); welders must hold EN ISO 9606 certificates for the exact process and position; NDT operators must be qualified to EN ISO 9712 level 2; inspection documentation moves to type 3.1/3.2 certificates with independent verification where specified; and the frequency of visual and dimensional inspection rises. We standardise on EXC3 not because every project needs it, but because it gives our European customers headroom: an EXC3 factory can execute EXC2 work trivially, while the reverse is not true. If your project requires EXC4 elements, we scope those joints separately rather than inflate the whole order.
Beyond Europe: How the Same Records Serve Other Markets
The certification system is designed so one audit trail serves multiple markets, because the underlying evidence — mill certificates, WPQRs, NDT reports, dimensional records — is standard-neutral. For an American project we re-map the same evidence against AISC 360/W (with AWS D1.1 weld acceptance) and issue an equivalence statement. For the Gulf region we layer the project's chosen code (often American or British) over our GB-licensed execution. For Chinese domestic projects the graded licenses and GB 50205 records apply directly. One factory, one audit trail, four document formats — that is what "compliance center" means on this page.
Two practical notes for buyers. First, certification copies in a tender are only as useful as their validity dates: our certificates are renewed on schedule, and we date-stamp every copy we issue so an auditor can confirm currency at a glance. Second, a certificate proves a management system exists — it does not by itself prove that a specific batch of steel was produced under it. That is why every certificate on this page is paired with batch-level documents: mill certificates, weld maps and NDT reports. The certificate plus the batch file is the combination a seasoned procurement engineer actually checks, and it is the combination we ship with every order.
Need the Full Certification File for a Tender?
Send us the document list your tender requires and we will compile the matching certificates, DoPs and equivalence statements, usually within 48 hours. For immediate needs, the core certificate pack is in our download center.
Download Complete Certification Documents