Selection summary
Overview
Z275 is an EN 10346 zinc-coating designation for continuously hot-dip coated steel flat products. It belongs to the EN system and is not presented as a universal exact synonym for ASTM G90: ordering and acceptance must retain the selected standard, substrate designation, test method, tolerances and surface condition.
This page separates standard-oriented limits from typical reference data. Purchase acceptance comes from the ordered specification and certified material test report.
Names and systems
Identity & standards
Similar designations across ASTM, EN, JIS, and other systems are not automatically interchangeable. Product form and ordered standard control chemistry, properties, dimensions, condition, and testing.
Reference chemistry
Composition
| Element | Reference range | Why it matters |
|---|---|---|
| Zinc coating | Designation-system controlled | Atmospheric corrosion protection for the coated sheet system |
| Steel substrate | Ordered separately | Carries strength, formability and dimensional requirements |
Concise grade-family reference only. Confirm every element limit against the current standard for the exact product ordered.
Condition matters
Reference properties
A designation is meaningful only with its governing standard, edition and product form.
Typical web values are screening information, not purchase acceptance limits.
Environment first
Corrosion behavior
Coating life depends on coating system, exposure, drainage, cut edges, fabrication damage and maintenance.
A coating designation does not establish universal service life or suitability.
Temperature, concentration, deposits, crevices, stress, surface finish, cleaning, and fabrication quality can change service performance.
Service limits
Temperature & service
Confirm temperature limits through the governing design code, product standard and complete material system.
Delivery condition
Heat treatment & condition
Do not infer heat treatment or temper from an incomplete designation.
State the ordered condition or temper and verify it on the certificate.
Process route
Fabrication
Qualify forming, welding, joining and surface-repair procedures for the ordered product form.
Preserve material or coating traceability after cutting and secondary processing.
Magnetic response: The steel substrate is ferromagnetic.
Decision boundaries
Comparisons & substitution
G60 and G90 are ASTM A653/A653M designations with ASTM ordering rules.
Designation conversion alone cannot prove product equivalence or service life.
Where it is used
Applications
Ordering scope
Product forms & standards
Continuously galvanized flat product under EN 10346
Decision support
Selection guidance
Choose this grade when
- The order is based on EN 10346 and explicitly specifies Z275.
- Substrate designation, surface quality and treatment are also defined.
Review another grade when
- The contract is written to ASTM or JIS and needs a documented cross-standard review.
- Edges, welds or aggressive exposure dominate corrosion risk.
Before ordering
Procurement checklist
State the coating standard, ordered edition and exact coating designation.
State substrate grade, delivery condition, thickness, width, tolerances and quantity.
State surface treatment, oil/passivation, spangle, intended forming and cut-edge controls.
Require coating evidence, substrate certificate, coil traceability, marking and dry export packing.
Traceable evidence