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ZM Coated Steel Technology
Solar farms last 25 years — and so should the steel beneath them. ZM coated steel (Zn-Al-Mg) self-repairs at the cut edge; providing 2× longer durability at half the thickness compared to HDG. Supply from 4 manufacturers: Magnelis®, PosMAC®, Shougang and HBIS — EN 10346 and ISO 8353:2024 certified, each batch verified by bath analysis.
Summary
Why ZM?
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50µm Thin but strong
ZM620 single-sided coating — 2× less material than HDG, longer lifespan.
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>50year Field life
ZM430 — ArcelorMittal Magnelis® design data, class C2/C3.
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10× Edge protection
Self-healing at the cut edge — a unique feature that HDG cannot provide.
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EN 10346 Standard
ZM310 / ZM430 grades + S350GD–S450GD steel. ISO 8353:2024 compliant.
Dictionary
ZM, Magnelis®, PosMAC®, Shougang, HBIS, HDG — they are not the same thing.
Terminology is the foundation of purchasing language. Brand, class, family—the key distinctions. ISOTEC verifies all manufacturers, including Magnelis®, PosMAC®, Shougang, and HBIS, through batch-based bath analysis and integrates them into its supply chain.
ZM
Within the scope of EN 10346 general Zn-Al-Mg coating family. Brand-independent technical grade. Al+Mg total %1.5–8, Mg ≥ %0.2. ISOTEC keeps 4 manufacturers from this family in its approved supply line.
Magnelis®
ArcelorMittal'Trademark of [Company Name]. Bathroom chemistry Zn-%3,5Al-%3Mg. Brand solution within the ZM class.
PosMAC® 3.0
POSCO'Trademark of [Company Name]. Bathroom chemical Zn-%3Mg-%2,5Al. ISOTEC 3.1 certified supply line.
Shougang Zn-Al-Mg
Shougang Group (China, China) production line. Bath chemicals. Zn-%3Al-%3Mg — Standardized according to ISOTEC specifications. Each batch is verified by EN 10204 Type 3.1 certification and independent testing/analysis laboratory bath chemistry analysis. ISOTEC approved supply line.
HBIS Zn-Al-Mg
HBIS Group (Hansteel / Laoting lines, China) production line. Bath chemicals. Zn-%3Al-%3Mg — Standardized according to ISOTEC specifications. Each batch is verified by EN 10204 Type 3.1 certification and independent testing/analysis laboratory bath chemistry analysis. ISOTEC approved supply line.
HDG
Hot-dip galvanizing. After manufacturing, the part is immersed in the bath; from ZM. different Process and strength profile.
Design life
How durable is ZM in C1–C5 corrosion classes?
ISO 9223 classifications — field reference for ZM310 and ZM430; not warranty period.
| Corrosion Class | ZM310 | ZM430 | ZM620* |
|---|---|---|---|
| C1 Indoor / sheltered | >50year | >50year | >50year |
| C2 Rural / low pollutant | >50year | >50year | >50year |
| C3 City / medium pollutant | 30–50year | 40–50year | >50year |
| C4 Industrial / medium salt | 15–30year | 20–40year | 30–50year |
| C5 High salt / aggressive | 8–15year | 10–20year | 15–30year |
Reference frame
Standards & Tests
Three references for procurement: EN 10346, ISO 8353:2024, EN 10204 Type 3.1.
EN 10346
Standard for continuously hot-dip coated flat steel products. ZM classes (ZM310, ZM430, ZM620…), steel grades (S350GD, S420GD, S450GD), and coating mass test methods are defined in this standard.
ISO 8353:2024
International product standard for ZM coated steel, published at the end of 2024. Al–Mg composition range, mass ratios, performance classification — a reference for new projects.
Test Methods
Coating thickness XRF (ISO 3497), basic steel chemistry OES (ASTM E415), corrosion ISO 9227 salt spray, coating mass EN 10346 Annex A Stripping test. Document level EN 10204 Type 3.1.
Test / Analysis
Which lab can perform the ZM test?
To independently verify the Al/Mg ratio, coating thickness, and corrosion performance of ZM coatings, you need a test/analysis laboratory operating according to ISO/IEC 17025 compliant methods. See a map of laboratories in 13 countries worldwide that can perform XRF composition analysis, GD-OES depth profiling, salt spray testing, and more.
Verification
Are all the ZM products on the market genuine?
According to EN 10346, the minimum total Al+Mg content of ZM coatings should be %1.5–8 and Mg ≥ %0.2. Products below these thresholds are not technically classified as ZM and do not possess self-healing properties.
Low Al/Mg Ratio
Mg <%0,2 → no self-healing. Al <%1,5 → ZM microstructure does not form. Risk of corrosion at cut edges.
Insufficient Coating Thickness
The label is ZM310, but the actual thickness is 15–18 µm (it should be 24 µm). Design life tables become invalid.
3.1 Missing Certificate
The quality name, coating class, mechanical test results, or coating mass value is missing — the document is invalid.
ZM620 Misconception
ZM620 is not included in the EN 10346:2015 standard table. The document labeled "EN 10346 ZM620" is technically incorrect.
Original brand vs. generic — can you see the difference?
Original brands provide a consistent composition; batch-based control in ISOTEC spec supply ensures this consistency; generics remain within a wide range. Self-healing requires Mg ≥%2.
| Covering | Al | Mg | Self-healing |
|---|---|---|---|
| Original brands — consistent composition | |||
| PosMAC® 3.0 (POSCO) | %2,5 | %3,0 | Optimal ✓ |
| Magnelis® (ArcelorMittal) | %3,5 | %3,0 | Optimal ✓ |
| ZM EcoProtect® (thyssenkrupp) | ≥%1 | ≥%1 | Yes ✓ |
| ISOTEC spec-compliant supply — batch-based verification. | |||
| Shougang Zn-Al-Mg (Chinese) | %3,0 | %3,0 | Optimal ✓ |
| HBIS Zn-Al-Mg (Chinese) | %3,0 | %3,0 | Optimal ✓ |
| Generic products — a wide range | |||
| Low Mg generic | %1–4 | %0,2–0,5 | No ✗ |
| Medium Mg generic | %1–3 | %0.5–1.5 | Weak ~ |
Mg <%0.5 → self-healing is practically zero. Mg ~%1.5 → weak/delayed. Mg ≥%3 → optimal (Magnelis/PosMAC target point).
How do you verify it?
The quality name (S350GD), coating class (ZM430), mechanical properties (Rp0.2/Rm/A80), and coating mass — all four fields must be complete.
Measurement of Zn/Al/Mg at least at 3 points according to ISO 3497. Al ≥%1.5 and Mg ≥%1.0 must be verified.
3.1 The temperature rating on the certificate must exactly match the rating on the delivery note and the physical product label.
EN 10346 Annex A verification by stripping method. ZM430 → total of two surfaces ≥430 g/m², single surface ≥150 g/m².
To compare
HDG vs ZM — which project is which?
Same zinc family, different processes. In cutting/drilling intensive applications like GES, the edge behavior of ZM makes a critical difference.
Process
HDG: Post-production part dipping (batch). ZM: continuous coating (coil) during production.
Cut edge
HDG: Unprotected, requires additional repairs. ZM: By passing Mg ions to the edge self-repair.
Typical lifespan (C3)
HDG 8020–30 years. ZM430: 40–50 years (Magnelis design data).
Thin sections
HDGPost-process immersion is restricted. ZM: Since it is applied during the coil stage, it is suitable for thin profiles.
Cost logic
HDGLow upfront cost per m². ZMHigh front finish, but no edge repair/refurbishment → Total cost of ownership could decrease over 25 years.
When is ZM?
Laser/plasma/shear-cut thin profile, solar panel carrier, coastal (C4/C5) applications, construction where a long life cycle is desired.
Same lifespan, less material.
Targeted 25-year service life in C4 environment: While ISO 1461 requires HDG to coat 4 mm steel with 70 µm coating, ZM430 only requires 3 mm steel with 35 µm coating.
| Criterion | HDG (ISO 1461) | ZM310 / ZM430 |
|---|---|---|
| C3 — Urban / moderate pollutant environment | ||
| Steel thickness | 3 mm (55 µm HDG) | 2.5–3 mm (ZM310 is sufficient) |
| Coating weight | ~550 g/m² | 310 g/m² |
| life expectancy | 25–35 years | 30–50 years |
| C4 — Industrial / medium salt environment | ||
| Steel thickness | 4 mm (70 µm HDG) | 3 mm (ZM430 is sufficient) |
| Coating weight | ~600 g/m² | 430 g/m² |
| life expectancy | ~23 years | 20–40 years |
| Cutting edge protection | Unprotected | Self-healing (Mg ions) |
| Weight saving (C4, 50×30 profile) | ~10.2 kg/m | ~7,6 kg/m (%25 daha hafif) |
Source: ISO 1461:2022, SCI 2024 independent review, ArcelorMittal Magnelis® technical publication.
Regardless of soil class, EN 10346 compliant ZM coating requirements apply to the steel supporting GES (Solar Power Plant) structures. Each item depends on the standard, test method, or certification requirement.
ZM Coated Steel Support System — Technical Specifications
1. Reference Standards. Load-bearing steel profiles and fasteners are manufactured and delivered in accordance with the following standards: TS EN 10346:2015 (continuously hot-dip coated steel flat products — technical delivery conditions; ZM descriptive envelope), ISO 8353:2024 (Zn-Al-Mg coated steel sheet — first edition, December 2024; product specification), EN 1090-2 (steel structures — application class at least EXC2), EN 10204 (types of inspection certificates), ISO 9223:2012 (atmospheric corrosion categories C1–CX), ISO 9224:2012 (long-term corrosion prediction methods), ISO 12944-2:2017 (environmental classification for paint/duplex systems), EN ISO 6892-1 (metal materials — tensile test).
2. Base Steel. The base steel grade shall be S350GD (minimum yield strength Rp0.2 ≥ 350 MPa, EN 10346 Table 7) or higher. Tensile properties are verified according to EN ISO 6892-1; the results are recorded as actual measurement values in the inspection certificate.
3. Coating Class. The coating shall be Zn-Al-Mg (ZM) of minimum class ZM310 according to TS EN 10346. The total coating mass on both surfaces is verified as triple-point average ≥ 310 g/m², single-point minimum ≥ 265 g/m² (EN 10346 Table 4). Reference measurement method is ISO 1460 (gravimetric); non-destructive alternative is ISO 3497 (XRF) or ISO 2178 (magnetic). Equivalent coating thickness is approximately 24 µm/surface (ZM430: 35 µm/surface).
4. Environment Category and Contractual Guarantee Basis. The atmospheric corrosion category of the project site is determined according to ISO 9223 and ISO 12944-2. The following table shows the corrosion classifications. contractual guarantee minimum (Procurement specification base) defines these values. These values have been conservatively derived based on the ArcelorMittal Magnelis® commercial warranty ceiling (up to 25 years in certain applications) and EN 10346 coating mass-thickness data. The expected field performance (design life) generally exceeds this base by 1.5–2x. — For field performance information, please refer to the "How long does ZM last in C1–C5 corrosion classes?" table above.
| Environment (ISO 9223) | Zn rate band (µm/year) | Minimum coverage | Contractual guarantee basis* |
|---|---|---|---|
| C1 — very low (indoor, protected) | ≤ 0.1 | ZM310 | ≥ 50 years |
| C2 — low (rural, low pollution) | ≤ 0.7 | ZM310 | ≥ 50 years |
| C3 — medium (urban/rural industrial) | ≤ 2.1 | ZM310 | ≥ 25 years |
| C4 — high (heavily industrial/salty inland region) | ≤ 4.2 | ZM430 | ≥ 20 years |
| C5 — very high (coastal / heavily industrial) | ≤ 8.4 | ZM430 + duplex (ZM + ISO 12944-5 compliant paint system) | ≥ 20 years |
* The contractual guarantee base is the minimum period committed in writing by the supplier until the first red rust penetration. Design life ≠ warranty period. Field performance varies depending on microclimate, installation design (drainage, electrolytic insulation), maintenance regime, and secondary interventions. ISO 9223 Im1/Im2/Im3 categories (pure water, seawater, continuous contact with soil) are outside the scope of pure ZM; duplex systems or special engineering assessments are mandatory for these applications.
5. Coating Composition. Bath chemistry: Total Al + Mg by weight %1.5–8, Mg ≥ %0.2, remainder Zn (EN 10346 ZM definition envelope). The ISOTEC primary supply envelope is narrower than this general definition: Al %2.5–3.5 and Mg %2.5–3.5 (Magnelis®, PosMAC®, Shougang and HBIS common optimum point). Composition is verified by ISO 3497 XRF or destructive ICP-OES and recorded on the inspection certificate as a casting analysis.
6. Inspection Certificate. An EN 10204 Type 3.1 inspection certificate will be provided for each batch. The certificate will be signed by an authorized inspection representative independent of the production department and will contain at least the following information: (i) material quality name (e.g., S350GD+ZM310), (ii) heat/cast number (matching the stamp on the material), (iii) chemical composition (casting analysis), (iv) mechanical test results (Rp0.2, Rm, A80), (v) coating mass measurement value (triple-point and single-point), (vi) order reference and TS EN 10346 declaration of conformity. Type 2.1 and 2.2 certificates are not accepted — the traceability chain is broken.
7. Incoming Quality Control. The buyer reserves the right to perform (a) certificate ↔ material heat no match, (b) visual surface inspection (cracks, abrasions, coating peeling), (c) ISO 3497 XRF thickness measurement (minimum 3 points/surface per lot) for each batch. Batches found to be non-conforming will be subjected to arbitration testing using the EN 10346 Annex A gravimetric method.
8. Supplier Guarantee. The supplier shall declare in writing the red rust penetration warranty for the delivered coated product, appropriate to the applied coating class and project environment category. The declared period cannot be less than the minimum values in the table in Clause 4. The warranty certificate shall clearly define: (i) the environment category (ISO 9223), (ii) the coating class (EN 10346), (iii) the applied product code, and (iv) the exclusions from the warranty — unauthorized cutting/drilling/welding/grinding on site, improper transport or storage, chemical contact, continuous contact with water/soil, breach of maintenance. In a C5 environment, the warranty depends on the duplex system application; pure ZM430 coating alone is not covered under the C5 warranty.
9. Rejection Criteria. The following situations are grounds for batch rejection: (a) Heat/cast number does not match the material stamp on the certificate, (b) Triple-point coating mass measurement < 310 g/m² or single-point < 265 g/m², (c) Al+Mg total < %1.5 or Mg < %0.2, (d) EN 10204 Type 3.1 inspection certificate is missing or signed by the production department, (e) Mechanical test values Rp0.2 < 350 MPa, (f) Supplier warranty statement is missing or below the minimum periods specified in Article 4 table. Conditional acceptance (with additional evidence): Manufacturer classes not included in the EN 10346:2015 normative table (e.g., "ZM620") are only accepted with manufacturer EN 10204 Type 3.1 certification and an independent testing/analysis laboratory report; otherwise, they will be rejected. ZM310 offers in C4 environments are only evaluated with project-specific corrosion analysis (micro-climate measurement, field exposure report); the corporate base coating is ZM430. Manufacturer offers without a registered trademark (Shougang, HBIS, etc.) are only accepted if manufacturer EN 10204 Type 3.1 certification, independent testing/analysis laboratory bath chemistry analysis (Al, Mg, Zn), and EN 10346 Annex A gravimetric coating mass report are submitted together for each batch.
10. Dispute Resolution. In case of measurement discrepancies, gravimetric testing according to EN 10346 Annex A is performed by an independent testing/analysis laboratory (using the appropriate method according to ISO/IEC 17025). The test cost is borne by the supplier if a discrepancy is found.
Admission — measurable evidence.
- TS EN 10346 minimum ZM310 (triple-point ≥ 310 g/m², single-point ≥ 265 g/m²)
- Base steel S350GD (Rp0.2 ≥ 350 MPa, EN ISO 6892-1)
- Compound Al+Mg %1.5–8, Mg ≥ %0.2 (ISO 3497 XRF / ICP-OES)
- EN 10204 Type 3.1 certificate — independent signature + heat no match
- ISO 1460 gravimetric measurement arbitration method
Red — direct return
- Heat/cast no certificate ↔ material stamp mismatch
- Measured mass < 310 g/m² (triple-point) or < 265 g/m² (single-point)
- Mg < %0,2 or Al+Mg < %1,5 — ZM outside the definition envelope
- EN 10204 Type 2.1/2.2 certificate — traceability broken.
- Non-standard class (e.g., ZM620) — additional offer without proof.
Only the main specification text is copied; the acceptance/rejection cards are summaries. For full review, “Enlarge” → Download PDF.
Technical library
Brochure, specifications, 5 technical reports
Download in your user language. Turkish is available; English and Democratic will be automatically activated when the translation is complete.
Report 1 — ZM General Review
General technical review of ZM coating and Magnelis technology within the EN 10346 framework.
Report 2 — Specification & Test Control
Procurement specification, incoming quality control plan, test methods.
Report 3 — C1–C5 Corrosion Resistance
Design life tables, warranty interpretation, field practice recommendations.
Frequently Asked Questions
