Standards Reference
A clear reference page for buyers who need to connect standards, inspection expectations, and manufacturing scope before placing an order.
EN 1090 project support
Used where structural steel execution and project documentation requirements are specified by the buyer or project standard.
ISO 3834 welding quality
A framework for welding quality control, procedure discipline, welder qualification, and inspection planning.
MTC 3.1 / MTC
Material certificate traceability for heat number, grade, chemical composition, mechanical properties, and mill source.
NDT and dimensional inspection
UT, MT, VT or other inspection methods can be planned according to drawings, order scope, and third-party requirements.
Product-specific requirements
Safety grating, platforms, stair treads, battery cabinets and wind components require different dimensional and surface criteria.
Project-specific standards
Share your specification early. We will confirm what can be manufactured, inspected, documented, and packed under the agreed scope.
Important note on standards
Standards are not just names to place on a web page. They define responsibilities, inspection points, acceptance criteria and documentation. For each project, the applicable standard should be confirmed in the drawing, purchase order, inspection plan or technical specification. We avoid vague promises and prefer to confirm the exact scope before production.
Understanding Manufacturing Standards for Steel Fabrication
Manufacturing standards define the minimum requirements for quality, safety, and traceability in steel fabrication. For international buyers sourcing structural components, understanding which standards apply — and what they actually require — is essential for avoiding costly misunderstandings between design intent and factory execution.
EN 1090: Structural Steel Execution Classes
EN 1090 (Execution of Steel Structures) classifies fabrication into four execution classes (EXC1 through EXC4) based on consequence class, service category, and production category. EXC2 covers most commercial and industrial structures. EXC3 applies to bridges, crane runways, and fatigue-loaded structures. Each class defines specific requirements for welding qualification, NDT extent, dimensional tolerances, and documentation. Our factory holds EN 1090-2 certification with capability up to EXC3, verified through annual audits by notified bodies.
ISO 3834: Welding Quality Requirements
ISO 3834 establishes quality requirements for fusion welding of metallic materials. Part 2 (Comprehensive Quality Requirements) is the most commonly specified level for structural fabrication. It mandates documented welding procedures (WPS per ISO 15614), qualified welders (ISO 9606), welding coordination personnel (IWE/IWT per ISO 14731), and systematic inspection planning. Our welding quality management system operates under ISO 3834-2, with qualified welding coordinators overseeing procedure development, welder qualification, and in-process inspection.
MTC 3.1: Material Test Certificates
EN 10204 Type 3.1 certificates (commonly called MTC 3.1) provide material traceability from the steel mill to the finished product. Each certificate documents the heat number, chemical composition (ladle analysis), mechanical properties (yield strength, tensile strength, elongation), and impact test results at specified temperatures. For structural applications, MTC 3.1 certificates are mandatory to verify that incoming material meets the specified grade (S235, S355, S460, etc.) and delivery condition (N, M, Q, QL, QL1).
NDT Standards and Acceptance Criteria
Non-destructive testing for welded structures follows ISO 17635 for method selection, with specific technique standards including ISO 17640 (UT), ISO 17638 (MT), ISO 17637 (VT), and ISO 17636 (RT). Acceptance criteria are defined by ISO 5817 weld quality levels (B, C, or D) as specified in the design documentation. The NDT extent — percentage of welds inspected and which methods apply — depends on the execution class, joint type, and material thickness. We maintain qualified NDT Level II operators for UT, MT, and VT, with third-party RT and PAUT available through accredited laboratories.
Related Products & Services
Access EN1090, ISO 3834, MTC & Inspection Guides needs
Reviewed by
Zhang Wei
Chief Quality Architect — ASNT / ISO 9712 Level III NDT
Leads multinational FAT validation and material traceability for EPC and OEM export projects.
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