Introduction

For international structural steel projects, standards compliance is one of the most important factors affecting cost, production schedule, quality control, and final project acceptance.

Different countries and regions use different structural design and fabrication systems. These differences are not limited to structural calculations. They can also affect the entire manufacturing process, including:

• Material selection

• Welding procedures

• High-strength bolted connections

• Dimensional tolerances

• Corrosion and fire protection

• Quality control and documentation

For steel structure manufacturers serving overseas projects, understanding the governing standard before production begins is essential.

This article provides a practical comparison of seven commonly encountered structural steel standard systems:

China GB, U.S. AISC/AWS, European Eurocode/EN, British BS, Australian AS/NZS, Saudi SBC, and Japanese JIS.

Note: Actual requirements may vary depending on the project specification, execution class, steel grade, member thickness, loading conditions, local regulations, and client requirements. The governing project documents should always take precedence.

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1. Overview of the Seven Major Structural Steel Standard Systems

Before comparing fabrication requirements, it is useful to understand the general positioning of each system.

China GB

Commonly referenced standards include:

• GB 50017

• GB 50205

• JGJ 81

The Chinese system is widely used for industrial buildings, commercial buildings, infrastructure, warehouses, workshops, and other structural steel projects in China.

Its fabrication and acceptance requirements cover material inspection, welding, dimensional tolerances, bolted connections, surface treatment, and installation quality.

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United States — AISC / AWS / ASTM

Typical U.S. structural steel projects may involve:

• AISC structural steel requirements

• ASTM material specifications

• AWS D1.1 welding requirements

• RCSC requirements for high-strength bolted connections

The U.S. system is widely used in North America and is also frequently specified for international industrial, infrastructure, oil & gas, and EPC projects.

AISC-based projects place strong emphasis on:

• Material traceability

• Welding procedure qualification

• High-strength bolting

• Fabrication tolerances

• Inspection documentation

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Europe — Eurocode / EN Standards

European projects commonly combine:

• Eurocode 3 for structural steel design

• EN 1090 for execution and fabrication

• EN 10025 for structural steel materials

• ISO/EN welding standards

Steel fabrication under EN 1090 is typically classified by Execution Class, such as:

• EXC1

• EXC2

• EXC3

• EXC4

Higher execution classes generally require more stringent fabrication, welding, inspection, and documentation controls.

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British Standards — BS

British projects may reference BS or BS EN standards depending on project specifications.

Traditional British steel structure requirements are known for detailed controls covering:

• Fabrication

• Welding

• Inspection

• Dimensional accuracy

• Surface protection

British-standard-based specifications are also encountered in some Commonwealth and international projects.

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Australia and New Zealand — AS/NZS

Common standards include:

• AS/NZS 3678

• AS/NZS 3679

• AS/NZS 5131

• AS/NZS 1554

• AS/NZS 1252

Australian steel projects typically place considerable emphasis on:

• Welding control

• Material traceability

• Inspection

• Coating systems

• Environmental durability

• Fabrication documentation

These requirements are particularly important for infrastructure, mining, industrial and coastal projects.

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Saudi Arabia — SBC

Saudi Building Code requirements are commonly combined with internationally recognized standards such as ASTM, AISC, AWS, or relevant project specifications.

For projects in Saudi Arabia and the Middle East, additional attention is often required for:

• High temperatures

• Strong UV exposure

• Desert environments

• Salt exposure

• Coastal corrosion

• Wind and sand

Material and coating systems therefore need to be adapted to the local environmental conditions.

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Japan — JIS

Japanese structural steel projects commonly use JIS material and fabrication standards.

JIS-based projects often emphasize:

• Dimensional accuracy

• Welding quality

• Material consistency

• Seismic performance

• Toughness

• Detailed factory quality control

Japanese specifications are also frequently encountered in Japanese-invested industrial projects in Southeast Asia.

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2. Material Selection: Steel Grades, Tolerances and Traceability

Material control is the foundation of structural steel fabrication.

Different systems use different steel grades and certification requirements.

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Key Material Control Differences

Material Certificates

International projects normally require steel materials to be traceable back to:

• Steel mill

• Heat number

• Batch number

• Material grade

• Plate or section identification

The traceability system should remain intact during:

Receiving → Cutting → Fabrication → Welding → Inspection → Shipment

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Toughness Requirements

Depending on:

• Steel grade

• Thickness

• Service temperature

• Structural importance

• Seismic requirements

projects may specify Charpy impact testing or other toughness requirements.

Low-temperature and dynamically loaded structures typically require more stringent material toughness verification.

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Through-Thickness Properties

For thick plates or highly restrained welded joints, the project specification may require through-thickness properties to reduce the risk of lamellar tearing.

Such requirements should be confirmed before raw material procurement.

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3. Welding Requirements

Welding is one of the most critical aspects of structural steel fabrication.

International standards generally control three areas:

Welder Qualification + Welding Procedure + Weld Inspection

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3.1 Welder Qualification

Typical qualification systems may include:

Welders should be qualified for the relevant:

• Welding process

• Welding position

• Material group

• Plate thickness

• Joint configuration

before production begins.

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3.2 WPS and PQR

A Welding Procedure Specification (WPS) defines how a weld should be produced.

Typical variables include:

• Welding process

• Electrode or wire

• Shielding gas

• Current

• Voltage

• Travel speed

• Heat input

• Joint preparation

• Preheat

• Interpass temperature

Where required, the WPS should be supported by a Procedure Qualification Record (PQR) or equivalent qualification evidence.

Different standards use different qualification frameworks, but the basic objective is the same:

To demonstrate that the proposed welding procedure can consistently produce an acceptable structural weld.

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3.3 Preheating

Required preheat temperature should not be treated as one fixed value for every steel grade.

It normally depends on factors such as:

• Steel grade

• Carbon equivalent

• Material thickness

• Hydrogen level

• Heat input

• Restraint

• Ambient temperature

High-strength and thick steel plates generally require greater attention to preheat and interpass temperature control.

For international projects, preheat requirements should therefore be determined from the applicable welding standard, qualified WPS, and project specification.

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3.4 Non-Destructive Testing — NDT

Common NDT methods include:

• Visual Testing — VT

• Ultrasonic Testing — UT

• Radiographic Testing — RT

• Magnetic Particle Testing — MT

• Penetrant Testing — PT

Inspection extent depends on:

• Weld type

• Structural importance

• Execution class

• Loading condition

• Fatigue requirements

• Project specification

Full-penetration welds and critical structural connections generally require a higher level of inspection than ordinary fillet welds.

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4. High-Strength Bolted Connections

High-strength bolts are widely used for site erection and major structural connections.

Different standards may specify different bolt systems, including:

• Property Class 8.8

• Property Class 10.9

• ASTM high-strength structural bolts

• EN high-strength bolt assemblies

• AS/NZS bolt systems

• JIS high-strength bolts

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Main Control Items

Regardless of the standard system, critical bolt-control items normally include:

Bolt Identification

The bolt grade, manufacturer and batch should be identifiable.

Storage

Bolts should be protected against:

• Moisture

• Contamination

• Thread damage

• Corrosion

Installation Method

Possible methods include:

• Torque control

• Turn-of-nut

• Tension-control bolts

• Direct-tension indicators

• Other approved pretensioning methods

Slip-Critical Connections

Where slip resistance is required, special attention should be given to:

• Faying surface condition

• Surface treatment

• Slip coefficient

• Bolt pretension

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5. Dimensional Accuracy and Trial Assembly

Fabrication accuracy directly affects erection efficiency.

Commonly controlled dimensions include:

• Member length

• Column height

• Beam length

• Hole location

• End plate position

• Diagonal dimensions

• Straightness

• Camber

• Twist

• Connection geometry

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Why Trial Assembly Matters

For complex structural systems, factory trial assembly can help verify:

• Connection alignment

• Bolt hole compatibility

• Member geometry

• Installation sequence

• Interface dimensions

Trial assembly is particularly valuable for:

• Complex trusses

• Large-span structures

• Heavy industrial structures

• Seismic connections

• Complicated node assemblies

The required extent of trial assembly should be confirmed from the applicable execution standard and project specification.

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6. Corrosion Protection

Corrosion protection is highly dependent on environmental exposure.

A coating system suitable for a dry inland warehouse may not be suitable for:

• Coastal buildings

• Chemical plants

• Marine environments

• High-humidity tropical projects

• Desert industrial facilities

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Surface Preparation

Abrasive blast cleaning to approximately Sa 2½ is widely specified for many industrial coating systems.

Equivalent surface-preparation specifications may also be used depending on the governing standard and coating manufacturer.

The prepared surface should be checked for:

• Cleanliness

• Dust

• Oil contamination

• Surface profile

• Rust

• Residual abrasive

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Coating Systems

Typical protective systems may include:

Zinc-Rich Primer
↓
Epoxy Intermediate Coat
↓
Polyurethane / Other Finish Coat

The required dry film thickness should be determined according to:

• Corrosivity category

• Design service life

• Coating manufacturer

• Project specification

• Local environmental exposure

A higher total coating thickness is often required for more severe environments.

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Coastal and Middle Eastern Projects

Projects exposed to:

• Salt spray

• High temperatures

• UV radiation

• Sand

• High humidity

typically require enhanced corrosion-protection systems.

Fasteners, gutters, flashing and secondary steel should also be considered — not only the main structural members.

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7. Fire Protection

Structural steel loses strength as temperature increases.

Depending on building regulations, steel structures may therefore require:

• Intumescent coating

• Cementitious fireproofing

• Fire-resistant boards

• Concrete encasement

• Other tested fire-protection systems

Common international fire-resistance test systems may include project-specific requirements based on:

• ASTM

• EN

• BS

• AS

• JIS

Fire-resistance ratings are usually specified in terms of required duration, such as:

• 1 hour

• 2 hours

• 3 hours

• or other project-specific ratings

The required system should be selected according to the governing building and fire code.

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8. Quality Control and Documentation

For overseas steel structure projects, manufacturing quality alone is not enough.

Documentation is part of the product.

A complete quality dossier may include:

Material Documents

• Mill Test Certificates

• Heat number records

• Material traceability reports

Welding Documents

• WPS

• PQR

• Welder qualification certificates

• Welding consumable records

• Preheat records where required

Inspection Documents

• Visual inspection reports

• UT reports

• MT reports

• RT reports where required

• Dimensional inspection records

Bolting Documents

• Bolt certificates

• Bolt installation records

• Calibration records where applicable

Coating Documents

• Surface preparation inspection

• Paint batch records

• Dry film thickness reports

• Environmental condition records

Final Documentation

• Inspection and Test Plan

• Final dimensional report

• Packing list

• Certificate of conformity where applicable

• Third-party inspection reports

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9. Key Differences Between Major Standard Systems

From a fabrication-management perspective, the most important differences can be summarized as follows.

U.S. Projects

Typically place strong emphasis on:

• ASTM material compliance

• AWS welding

• High-strength bolting

• Fabrication quality systems

• Traceable inspection documentation

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European Projects

Commonly emphasize:

• EN 1090 execution requirements

• Execution Class

• Factory Production Control

• Welding coordination

• CE-related documentation where applicable

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Australian Projects

Often require particularly strong controls over:

• Welding

• Material traceability

• Inspection

• Coating durability

• Documentation

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Saudi and Middle Eastern Projects

In addition to structural compliance, particular attention may be required for:

• High temperatures

• UV exposure

• Coastal salt

• Sand

• Corrosion protection

• Project-specific international standards

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Japanese Projects

Often emphasize:

• Dimensional accuracy

• Welding quality

• Material consistency

• Seismic-related fabrication quality

• Detailed inspection records

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10. How Steel Fabricators Should Manage Multi-Standard Projects

For an overseas steel structure project, the manufacturing standard should be confirmed before quotation and raw-material purchasing.

A practical workflow is:

Step 1 — Confirm Governing Standards
↓
Step 2 — Review Drawings and Project Specifications
↓
Step 3 — Confirm Material Grades
↓
Step 4 — Review Welding Requirements
↓
Step 5 — Confirm Bolt System
↓
Step 6 — Define Fabrication Tolerances
↓
Step 7 — Confirm Corrosion / Fire Protection
↓
Step 8 — Prepare Inspection & Test Plan
↓
Step 9 — Complete Manufacturing and Inspection
↓
Step 10 — Prepare Final Quality Documentation

This process helps reduce:

• Material substitution risks

• Welding requalification

• Production delays

• Rework

• Inspection rejection

• Documentation gaps

• Site installation problems

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Conclusion

The key challenge in international structural steel fabrication is not simply producing steel components.

It is producing them according to the correct project standard, fabrication specification, inspection requirements, and documentation system.

The main areas that should be confirmed before production include:

Material Grades → Welding → High-Strength Bolts → Fabrication Tolerances → Corrosion Protection → Fire Protection → Quality Documentation

For manufacturers handling multiple overseas markets, the ability to adapt production processes to different standards is an important part of project delivery capability.

ZSJH STEEL provides customized structural steel fabrication for overseas industrial and commercial projects, supporting drawing review, engineering coordination, manufacturing, welding, quality inspection, surface treatment, packaging, export, and installation guidance.

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