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Q355NH bridge weathering steel cutting
Q355NH bridge weathering steel cutting
Process + service, customized requirements
weathering steel
Production technology
Hot rolling process: the billet is heated to more than 1200℃, Cu, P, Cr, Ni and other alloying elements are added, and the cooling is controlled after rolling.
1. Surface treatment: naturally generated dense oxide rust layer (no coating required), or pre-rust treatment (accelerate the formation of stable rust layer).
2. Surface treatment: naturally generated dense oxide rust layer (no coating required), or pre-rust treatment (accelerate the formation of stable rust layer).
mechanical properties
| argument | Typical value (Q355NH) |
| Yield strength (ReH) | ≥355 MPa |
| Tensile strength (Rm) | 490-630 MPa |
| Elongation after fracture (A) | ≥22% |
| Impact work (Akv) | ≥34J |
Implement standard control
| Standard system | Corresponding brand | Core requirement |
| China Standard (GB) | GB/T 4171 Q355NH | Cu≥0.25%, corrosion resistance index I≥6.0 |
| American Standard (ASTM) | ASTM A588 Grade K | P≤0.04%, tensile strength ≥485 MPa |
| Japanese Standard (JIS) | JIS G3125 SPA-H | Cr≥0.30%, excellent salt spray resistance |
| European Standard (EN) | EN 10025-5 S355J0W | Cu+Cr+Ni≥0.50%, suitable for Marine climate |
Usage and application scenarios
1.Building structure
•Bridge structures, stadium roofs, art sculptures (such as the pedestal of the Statue of Liberty in New York).
2.Energy field:
•wind power tower barrel, photovoltaic bracket (suitable for desert/coastal corrosive environment).
3.Transportation
• Railway cars, container shells, highway noise barriers.
Technical parameter
- Corrosion resistance: atmospheric corrosion rate ≤0.01mm/ year (Corten A, rural environment).
- Weldability: need low hydrogen electrode (such as J507RH), preheating temperature ≥100℃ (plate thickness > 25mm).
Wear-Resistant Steel
Production technology
- Hot rolling + tempering: quenching after rolling (water-cooled/oil-cooled) + tempering to improve hardness and toughness.
- Surfacing composite: substrate (Q235) + surfacing of high carbon and high chromium alloy layer (hardness HRC58+).
mechanical properties
| argument | NM400 wear-resistant plate | HARDOX 450 |
| Brinell Hardness (HBW) | 370-430 | 425-475 |
| Tensile strength (Rm) | ≥1250 MPa | ≥1400 MPa |
| Impact energy (20℃) | ≥24J | ≥40J |
Implement standard control
| Standard system | Corresponding brand | Core requirement |
| China Standard (GB) | GB/T 24186 NM400 | Hardness HBW 370-430, tensile ≥1250MPa |
| American Standard (ASTM) | ASTM A514 Grade B | Yield ≥690 MPa, strict welding process |
| Japanese Standard (JIS) | JIS G4404 SUMIHARD-K | Hardness HV 400, suitable for construction machinery |
| European Standard (EN) | EN 10028-7 XAR 400 | Wear layer thickness ≥3mm, impact resistance |
Usage and application scenarios
- Mining machinery: excavator bucket, crusher jaw plate, mining truck container liner plate.
- Cement industry: raw material grinding roller, conveyor chute, powder separator blade.
- Agricultural equipment: combine blade, share, inner wall of feed mixer.
- Energy field: coal conveyor roller, power plant mill liner.
Technical parameter
- Wear resistance: 10-20 times longer than ordinary steel wear life (ASTM G65 wear test).
- Machinability: laser cutting requires gas protection (anti-cracking), bending radius ≥8 times the thickness of the plate.
Comparison of application fields
| sort | Weather resistant steel plate | Wear-resistant steel plate |
|---|---|---|
| unit | Bridges, curtain walls, outdoor sculptures | Factory floor, hopper liner |
| traffic | Railway cars, containers | Dump truck compartment, shovel blade |
| machine | Port crane structure | Crusher rotor, hydraulic support plate |
| Source of energy | Wind power tower, photovoltaic bracket | Coal pipeline, mill liner |
International standard comparison table
| Performance requirement | Standard for weathering steel | Standard for wear-resistant steel |
|---|---|---|
| High strength | ASTM A606 (US standard) | JIS G4404 (japan standard) |
| Low temperature toughness | EN 10025-5 (European standard) | EN 10028-7 (European standard) |
| weldability | GB/T 4171 (National standard) | ASTM A514 (US standard) |
- Weathering steel: with corrosion resistance as the core, suitable for long-term exposure to the atmospheric environment of the load-bearing structure, need to pay attention to alloying element content and rust layer stability.
- Wear-resistant steel: wear resistance as the core, suitable for high impact, high friction scenarios, need to balance hardness and toughness, preferred to choose tempering or surfacing process.
Selection suggestion:
- Coastal Projects → Select Corten A (ASTM A588) or S355J0W (EN 10025-5);
- Mine heavy equipment → Select NM450 (GB) or HARDOX 500 (European standard).
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Final Inspections, Occupancy Permits, And Project.
In the initial phases, architects and designers play a crucial role in conceptualizing and designing projects, ensuring they align with both aesthetic and functional requirements.
After price confirmed, FREE SAMPLE could be provided for your evaluation. After you confirm the sample details, the samples will be ready for delivery in 3-7days, and will be sent to you via express and arrive in 3-5days.1
Yes, our company mainly deals with wholesale deals, but if you insist buying one piece, or you just need one piece, we would be very likely to make the MOQ as 1 piece for you though.
Our company has been in Alibaba.com for 11 years, which is longer than most of our fellow suppliers, we've been golden suppliers for years. What's more, we've got quite a lot authority certificates, for example, BV, ISO9001, API, Alibaba onsite check cert