How to Match Steel Material to Local Standards (ASTM, EN, AS Guide)

Steel grade names mean different things in different regions.

How to Match Material to Local Standards

Complete Global Guide for Roll Forming & Structural Steel

1️⃣ Why Local Standards Matter

Steel grade names mean different things in different regions.

For example:

G550 in Australia
ASTM A653 Grade 80 in USA
S550GD in Europe

They may be equivalent — but not always identical.

If you supply the wrong standard:

Project may fail inspection
Material may be rejected
Warranty voided
Structural compliance compromised

Matching material to local standards is critical in global supply.

2️⃣ The Four Key Elements to Match

When aligning material to local standards, you must confirm:

✔ Yield strength
✔ Tensile strength
✔ Coating type & weight
✔ Thickness tolerance

Grade name alone is not enough.

3️⃣ Major Global Steel Standards

United States

ASTM A653 (galvanized)
ASTM A792 (Galvalume)
ASTM A1003 (structural framing)
Yield expressed in ksi (33 ksi, 50 ksi, 80 ksi)

Europe

EN 10346
Grades like S250GD, S350GD, S550GD
Coatings like Z275, AZ150

Australia / New Zealand

AS 1397
Grades: G250, G350, G550
Coating: Z275, AZ150

Middle East & Africa

Often use mix of:

ASTM
EN
Australian standards

Asia

Often use:

JIS standards (Japan)
GB standards (China)
Or ASTM equivalents

4️⃣ Matching Yield Strength

Example equivalence:

Region	Example Grade	Approx Yield Strength
Australia	G550	550 MPa
Europe	S550GD	550 MPa
USA	Grade 80	550 MPa

Always compare:

Actual minimum yield (MPa or ksi) — not just name.

5️⃣ Matching Coating Weights

Coating standards vary:

USA:

G90 (~275 g/m²)

Europe:

Z275

Australia:

Z275

AZ coatings:

AZ150 (150 g/m² Al-Zn)

Names may differ but coating mass must match.

6️⃣ Base Metal Thickness (BMT) vs Total Coated Thickness (TCT)

Some countries specify:

BMT (Base Metal Thickness)

Others reference:

Total thickness including coating.

If not clarified, this creates serious mismatch.

Always confirm BMT when calculating developed width.

7️⃣ Structural Code Requirements

Matching steel grade is not enough.

Local building codes may specify:

✔ Minimum yield strength
✔ Fire performance
✔ Deflection limits
✔ Coating class for corrosion zone
✔ Wind uplift standards

Material must match structural code.

8️⃣ Roofing Example: USA vs Australia

Australia roofing commonly:

0.42 mm G550 AZ150

USA roofing may use:

26 ga Grade 80 G90

Yield strength may align
But coating system may differ.

Always compare:

✔ Yield MPa
✔ Coating mass
✔ Thickness in mm

9️⃣ Purlin Example: Europe vs USA

Europe:

S350GD Z275

USA:

ASTM A653 Grade 50

Grade 50 ≈ 345 MPa
Close to S350GD (350 MPa)

But confirm coating and tolerance.

🔟 Environmental Classification Matching

Europe uses:

Corrosion categories C1–C5

Other regions specify:

Coastal / industrial / rural

Match coating class to environment classification.

Example:

C5 marine → AZ150 or heavier coating recommended.

1️⃣1️⃣ Mill Certificates & Documentation

To match local standards, request:

✔ Mill Test Certificate (MTC)
✔ Chemical composition
✔ Mechanical properties
✔ Coating weight test
✔ Thickness tolerance

Never rely on invoice description alone.

1️⃣2️⃣ Common Mistakes in International Projects

❌ Matching by grade name only
❌ Ignoring coating weight
❌ Confusing gauge with mm
❌ Ignoring local building code
❌ Not checking certification requirements

Compliance is documentation-driven.

1️⃣3️⃣ Machine & Forming Considerations

Different standards may allow:

Different thickness tolerances.

If thickness tolerance changes:

Developed width changes slightly.

High tensile equivalent may also:

Increase springback.

Machine must handle specified grade.

1️⃣4️⃣ Practical Matching Checklist

When exporting steel or machines:

Confirm local required standard
Identify required yield strength
Match coating class
Confirm BMT specification
Confirm tolerance range
Confirm corrosion classification
Verify compliance documentation

Only then approve supply.

1️⃣5️⃣ Example Cross-Reference Table

Australia	Europe	USA	Approx Yield
G250	S250GD	Grade 33	250 MPa
G350	S350GD	Grade 50	350 MPa
G550	S550GD	Grade 80	550 MPa

Always verify latest official specification.

1️⃣6️⃣ Why This Matters for Roll Forming Machines

If machine designed for:

G250

But project requires:

S550GD

Machine may experience:

Increased springback
Higher forming load
Tooling stress

Material standard affects machine design.

1️⃣7️⃣ Engineering Summary

To match material to local standards:

✔ Compare yield strength
✔ Compare coating weight
✔ Confirm BMT vs TCT
✔ Check corrosion classification
✔ Review local building code
✔ Validate with mill certificate

Never match by name alone.

Material equivalence requires data comparison.

FAQ Section

Is G550 the same as Grade 80?

Approximately equivalent yield strength, but verify specification details.

Is Z275 the same as G90?

Very similar (~275 g/m² zinc), but confirm standard tolerance.

Can I export Australian steel to USA?

Yes, but it must meet ASTM requirements and documentation.

Does grade name guarantee equivalence?

No. Always compare mechanical properties.

Should machine capacity match highest grade?

Yes. Always design for maximum specified yield strength.

Is coating standard important for roofing?

Absolutely. Corrosion classification determines coating selection.