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No, Grade 43 steel is not equivalent to S275N, though they share similarities in yield strength (both ~275 MPa). Grade 43 (from the obsolete British Standard BS 4360) is a basic non-alloy structural steel, primarily equivalent to S275JR (EN 10025-2), with no mandatory low-temperature impact testing or normalization. S275N (EN 10025-3) is a normalized fine-grain steel with specified impact toughness at -20°C (47 J longitudinal), making it more suitable for cold environments than Grade 43.
Grade 43 variants like 43D or 43DD come closer to S275N due to optional impact requirements, but S275N's normalization provides finer grain and better ductility. For exact substitution in modern projects, use S275N or ASTM A572 Gr. 50 (equivalent to S275N's toughness).
|
Property |
Grade 43 (BS 4360) |
S275N (EN 10025-3) |
|---|---|---|
|
Yield Strength (MPa) |
275 (≤16 mm) |
275 (≤16 mm) |
|
Tensile Strength (MPa) |
370–530 |
370–530 |
|
Elongation (%) |
21–23 |
23 |
|
Impact Toughness |
Not mandatory (optional for D/DD variants at 0°C/ -20°C) |
47 J at -20°C (mandatory) |
|
Delivery Condition |
As-rolled |
Normalized (+N) |
|
CEV |
~0.40 |
≤0.40 |
|
Grain Structure |
Coarse |
Fine-grain (normalized) |
|
Typical Applications |
General construction, buildings |
Cold environments (bridges, offshore) |
Notes: Grade 43 lacks S275N's mandatory normalization and impact, reducing its suitability for low temperatures. Substitution requires code verification.
Grade 43 is cost-effective for mild conditions but may underperform in cold or high-strain scenarios without impact testing. S275N's fine-grain normalization ensures better ductility and fracture resistance, complying with modern Eurocode requirements. For equivalents, Grade 43A ≈ S275JR, Grade 43D ≈ S275J2, but S275N ≈ ASTM A572 Gr. 50.
Gangsteel supplies S275N with custom certifications for seamless upgrades.
Grade 43 steel is not S275N; it's equivalent to S275JR, lacking mandatory impact and normalization. S275N's -20°C toughness (47 J) and fine-grain structure make it superior for cold applications, closer to A572 Gr. 50. Use S275N for projects needing enhanced cold performance.
Grade 43 (BS 4360) is as-rolled without specified impact, equivalent to S275JR; S275N requires normalization and 47 J at -20°C.
Grade 43D ≈ S275J2 (impact at -20°C), but S275N adds normalization for better ductility.
No — S275N's fine-grain and impact ensure cold fracture resistance; test Grade 43 or use S275N.
Mandatory -20°C impact (47 J) and normalization for finer grain, improving cold toughness.
A572 Grade 50, with 345 MPa yield and impact options matching S275N's toughness.
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