Как проверить производителя зданий со стальным каркасом

KXD Steel Technical & Project Team | Engineering & Project Delivery, Qingdao KXD Steel Structure Co., Ltd. | Published: August 21, 2026

Проверка производителя зданий со стальным каркасом сводится к документам, которые можно запросить и проверить: область действия сертификата, а не изображения сертификатов; записи о процедурах сварки; программное обеспечение для деталировки и специалист, который с ним работает; строительные нормы, по которым будет спроектирован каркас; а также то, что не входит в коммерческое предложение.

Certificate validity dates move, so request current copies rather than relying on any published summary, including this one.

Ask for the certificate scope, not the certificate image

A scanned certificate proves a certificate exists. It does not tell you what it covers.
Every management-system and product certificate carries a scope statement naming the activities, products and sites it applies to. Request the scope page. A certificate issued to a trading office does not cover a fabrication plant, and a certificate covering light steel does not automatically extend to heavy welded sections.

What to request: the certificate number, the issuing body, the validity dates, and the scope text. Then check the number against the issuing body’s public register.

What does EN 1090 actually cover on your project?

For any building going to the European market, CE marking under EN 1090 is the gate.

The European Commission states that CE marking on construction products indicates conformity with declared performance assessed under a harmonised European standard or a European Technical Assessment, and Commission material references EN 1090 specifically for structural products. A fabricator without EN 1090 factory production control cannot legally supply CE-marked structural steelwork into that market.

EN 1090 certification is scoped rather than blanket. Ask which product types and execution requirements the supplier’s certification covers, and confirm your building sits inside that scope before contract, not during customs clearance.

KXD lists CE (EN 1090) among its certifications, alongside ISO 9001, ISO 14001 and ISO 45001.

Request the WPQR before welding starts

Welding Procedure Qualification Records document that a specific welding procedure has been tested and qualified. They are the closest thing to direct evidence that the joints in your building will be made a known way.

KXD lists WPQR as available on request. That phrasing is worth noting: the records exist as project documentation rather than as a marketing download, which is normal in this trade. Ask for the ones relevant to your connection types and steel grades, not a generic sample.

A supplier who cannot produce any WPQR for the joints in your drawing is telling you something useful.

Three ISO certificates, three different questions

These get quoted as a block. They answer separate things.

ISO defines ISO 9001 as its quality-management-system standard, ISO 14001 as its environmental-management-system standard, and ISO 45001 as its occupational-health-and-safety management-system standard.

The practical use of this table is negative: it stops you from accepting ISO 9001 as an answer to a structural engineering question. Those are different conversations with different documents.

Separate the technical credentials from the commercial ones

This is where buyers most often go wrong, and it costs nothing to fix.

Suppliers publish a mix of credentials. Some are technical. Some are financial or administrative, issued by tax authorities or credit rating bodies, and they say nothing about welding, design or fabrication tolerance.

KXD lists all five categories, including an AISC certification as Building Fabricator with Complex Coating Endorsement P1, and an A-level taxpayer rating for eight consecutive years from 2016 to 2023. For North American projects, the American Institute of Steel Construction is the authoritative reference for what its fabricator certification and coating endorsements cover.

The commercial credentials are real and worth knowing. They belong in a payment-terms conversation, not a technical evaluation.

Who does the detailing, and in what software?

Detailing is where design intent becomes fabrication drawings, and it is routinely outsourced without the buyer being told.

Ask two questions. Is detailing done in-house or subcontracted? And which software produces the shop drawings?

KXD’s disclosed in-house engineering tools are Tekla, PKPM and 3D3S. Tekla output matters if you or your local erector need a model to coordinate against; PKPM and 3D3S are relevant to Chinese-code analysis. If a supplier cannot name the software or the team, the drawings are probably coming from somewhere they do not control, and revision turnaround will show it.

Design code is a project decision, not a supplier default

A frame designed to one national code and installed under another is a permitting problem discovered late.

Confirm in writing which code governs your building. Across KXD’s product lines, GB, ASTM, AISI, JIS, BS, DIN and EN references appear depending on the product. The applicable one is set by

your site’s approval authority, not by the fabricator’s habit.

Two follow-ups worth asking:

• Which code edition, since editions change load factors
• Who is responsible for local authority submission and any re-engineering it requires

Match the published spec sheet to your building

Certificates tell you about the company. The spec sheet tells you whether the product fits.

For the Custom Steel Structure Building:

Two lines here do real work in a vetting conversation. The MOQ of 600 m² sets a floor below which this product is not available, whatever the enquiry says. And the capacity figure should be treated as a catalog product-page value rather than a universal company-wide number, because older-style pages carry different figures. Ask what capacity is allocated to your delivery window specifically, which is the number that affects your schedule.

Some products carry no published price at all and are quotation-only. That is not evasion; it reflects configurations where span, height and crane loading move the figure too far for a range to mean anything.

Where This Checklist Has Limits

Document-based vetting is the best remote tool available. It is not complete, and pretending otherwise would be its own form of sales pitch.

Certificates confirm systems and scope. They do not predict whether a particular project team will hit a particular schedule, and they do not detect the coordination failures that cause most delivery problems. A supplier can be fully certified and still mismanage a project.

Over-specification is a real cost as well. Requiring EN 1090 for a building going to a market that does not require it, or commissioning full third-party inspection on a simple low-span shed, adds cost without adding protection. Match the documentation demand to the actual risk and destination.

There is also a category of competent smaller fabricators who never pursued export certification because their market never asked for it. Ruling them out on paperwork alone may be correct for an EU-bound project and wrong for a domestic one.

Часто задаваемые вопросы

Q: What certificates should a steel structure building manufacturer have?

A: It depends on destination. For the EU, CE marking under EN 1090 is a legal precondition. ISO 9001, 14001 and 45001 cover management systems. WPQR covers welding procedures. AISC certification is the relevant reference for North American fabricator assessment.

Q: How do I verify a certificate is genuine?

A: Take the certificate number and issuing body from the scope page and check it against that body’s public register. Do not rely on a scanned image alone.

Q: Does ISO 9001 mean the steel quality is good?

A: No. ISO defines it as a quality management system standard, meaning documented and audited processes. Structural performance is confirmed through design calculations, material certificates and welding records.

Q: What is a WPQR and why does it matter?

A: A Welding Procedure Qualification Record documents that a welding procedure has been tested and qualified. It is direct evidence about how the joints in your building will be made. KXD lists it as available on request.

Q: How much does a steel structure building cost from a manufacturer?

A: The Custom Steel Structure Building is published at USD 40–100/m² for the structural package. Some other configurations are quotation-only. Freight, duty, foundations and erection sit outside these figures.

Q: What is the minimum order?

A: 600 m² for the Custom Steel Structure Building. Certain product lines, including PEB and multi-storey steel buildings, are listed at 200 m².

Q: Should I insist on third-party inspection?

A: On higher-value or crane-loaded projects, generally yes, and it should be scoped and priced in the contract. On simple low-span structures it may cost more than the risk it covers.

What to Send in the First Email

A vetting request that gets useful answers rather than a brochure contains four asks: the scope pages of the relevant certificates, the name and software of the detailing team, the design code the supplier proposes for your site, and a quotation with an explicit exclusions list.

One area this checklist does not cover, and which matters once you have shortlisted two or three suppliers: how to structure payment terms and inspection milestones so that documentation obligations remain enforceable after the deposit is paid. Certificates verified at enquiry stage carry no weight if the contract never references them.

About the author: The KXD Steel Technical & Project Team works on design, detailing, fabrication and delivery of prefabricated steel structures for industrial, commercial, logistics, agricultural and infrastructure applications, with steel-structure expertise dating to 1997 and project experience across more than 80 countries and regions.