A70950W Corten Weathering Steel
ASTM A709 Grade 50W is a high-strength, low-alloy weathering structural steel. It is primarily used in the fabrication of bridges and heavy load-bearing structures.
Known for its enhanced atmospheric corrosion resistance, this weathering steel is engineered to develop a protective oxide outer layer (patina) when exposed to dry-wet cycles in the atmosphere.
With an atmospheric corrosion index of 6.00 or higher (calculated per ASTM G101), ASTM A709-50W offers significantly better corrosion resistance than conventional carbon steel with or without copper addition. When properly designed, it is highly suitable for use in the bare (unpainted) condition, lowering long-term maintenance costs and minimizing environmental impact.
Chemical composition & Mechanical property
For more property in A709 Gr.50W steel plate, please check them in following;
A709 Grade 50S Chemical composition Heat analysis
| Element | Chemical % |
| C, max | 0.23 |
| Mn | 0.50-1.60A |
| Si ,max | 0.40 |
| V ,max | 0.15B |
| Nb ,max | 0.05B |
| P ,max | 0.035 |
| S ,max | 0.045 |
| Cu ,max | 0.60 |
| Ni xma | 0.45 |
| Cr ,max | 0.35 |
| Mo ,max | 0.15 |
A 709 Gr. 50S mechanical property
| A709 Grade | Thick mm |
Yield [MPa] |
Tensile [MPa] | Elongtation Min % | reduction Min % |
HB | |||
| Steel Plate | Structural steel | ||||||||
| 8in[200mm] | 2in[50mm] | 8in[200mm] | 2in[50mm] | ||||||
| 36[250] | ≤100 | [250]min | 400-550 | 20 | 23 | 20 | 21 | … | … |
| [250]min | 400min | … | … | 20 | 19 | … | … | ||
| 50[345] | ≤100 | 345min | 450min | 18 | 21 | 18 | 21F | … | … |
| 50S[345S] | G | 345-450HI | 450minH | … | … | 18 | 21 | … | … |
| 50W[345W] HPS50W[HPS345W] |
≤100 | 345min | 485min | 18 | 21 | 18 | 21J | … | … |
| HPS70W[HPS485W] | ≤100 | 485min | 585-760 | … | 19K | … | … | … | … |
| 100 [690], 100W [690W],HPS100W [HPS690W] | ≤65 | 690minB | 760-895 | … | 18K | … | … | L | 235-293M |
| 100 [690], 100W [690W], | 65-100 | 620minB | 690-895 | … | 16K | … | … | L | … |
3. Key Applications
ASTM A709-50W is utilized across heavy civil and structural engineering projects where durability, weight savings, and atmospheric corrosion resistance are critical:
Bridge Engineering:
Main Girders: Used as primary load-carrying longitudinal members.
Deck Panels (Decks): Suitable for steel deck applications requiring high strength-to-weight ratios.
Trusses: Fabricated into complex truss structures for long-span crossings.
Highway Infrastructure:
Highway Guardrails and Posts: Provides long-term structural resilience against roadside atmospheric moisture without requiring constant zinc-galvanizing maintenance.
Overpasses & Viaducts: Excellent for highway crossings, railroad bridges, and elevated viaduct structures where painting or maintenance shutdowns are highly disruptive.
Heavy Building Structures: Utilized in industrial frameworks, high-rise structural elements, and exposed architectural steel framing where weathering aesthetics are preferred.
4,A709 Gr50W PROJECT
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