GB/T 4171 Q355GNH Corten steel plate has better corrosion resistance in the atmosphere. GB/T 4171 Q355GNH Corten steel plate major added metal elements are nickel, copper. Compared to stainless steel, only trace amounts of alloying elements, alloys such as weathering resisting steel elements of total P, Cu, Cr, Ni, Mo, Nb, V,Ti, etc.
GB/T 4171 Q355GNH Corten steel plate has good anti rust protection and welding ability and is used in shipping container,support frame of outside building etc. Also uses in manufacturing each kind of structural element which was used under the atmospheric envirenment and the caustic gas, the liquid envirenment.
GB/T 4171 Q355GNH Corten steel plate Specification
Thickness: 2-300mm
Width: 1000-4200mm
Length: 1000-12000mm
Q355NHB Chemical Composition (wt%)
| Element | C | Si | Mn | P | S | Cr | Ni | Cu |
|---|---|---|---|---|---|---|---|---|
| Content | 0.12–0.21 | 0.20–2.00 | 0.50–1.50 | ≤0.030 | ≤0.030 | 0.40–0.80 | ≤0.65 | 0.25–0.55 |
Key alloying elements:
Cu, Cr, Ni – promote formation of a compact protective oxide layer
Si & Mn – improve strength and deoxidation
Low P & S – ensure good toughness and weldability
Mechanical Properties
| Property | Requirement |
|---|---|
| Yield Strength (Rp0.2) | ≥ 355 MPa |
| Tensile Strength (Rm) | 490 – 630 MPa |
| Elongation (A) | ≥ 21 % |
| Impact Energy (KV, −20°C) | ≥ 41 J |
| Reduction of Area (Z) | ≥ 23 % |
These properties ensure that Q355NHB combines high load-bearing capacity with excellent low-temperature toughness and good plasticity.
Heat Treatment Conditions
Q355NHB steel plates can be supplied in:
- As-rolled (AR)
- Normalized (N)
- Normalized + Tempered
- Quenched & Tempered (Q+T)
- Solution & Aging
- Annealed
These processing routes allow the steel to meet different project requirements in terms of strength, toughness, and dimensional stability.
Equivalent Grades
Q355NHB is equivalent or similar to:
| Standard | Grade |
|---|---|
| ASTM | A588, A242 |
| EN | S355J2W, S355K2W |
| JIS | SPA-H |
| GB | Q355NH |
Typical Applications
Bridges & Infrastructure: Main girders, piers, coastal/river-crossing bridge components (salt spray/humidity resistance)
Building & Architecture: Steel frames, curtain walls, roof panels for stadiums/airports; natural rust patina for aesthetic integration
Transportation: Railway freight car bodies, container frames, highway guardrails (rain/snow/road salt resistance)
Coastal & Municipal: Port cranes, transmission towers, garbage treatment plants, open-air scenic facilities (low-maintenance, green construction)
Heavy Machinery: Mining/agricultural machinery frames, port handling equipment (high strength + weather resistance)
GNEE Steel offers Q355GNH plates in 1.5-60mm thickness (custom cut-to-size), 25,000+ tons spot stock, 7-day fast delivery for spot orders, with rust acceleration treatment, project certifications (ISO9001, SGS, TUV, BV), and 24/7 technical support. Exported to 50+ countries, we provide one-stop solutions for global outdoor engineering projects.
Q: What are the common delivery states of Q355NHB?
A: Common delivery states of Q355NHB include hot-rolled, controlled rolling, normalized, and customized states like quenched-tempered.
Q: What thickness, width, and length specifications of Q355NHB are available?
A: Q355NHB has common thicknesses from 10mm to 40mm, with various width and length options, and non-standard sizes can be customized.
Q: What is the maximum thickness of Q355NHB that can be supplied?
A: The maximum supply thickness of Q355NHB varies by manufacturer, and there is usually a minimum order quantity with preferential prices for bulk orders.
Q: Does Q355NHB require surface treatment before delivery?
A: Q355NHB is generally delivered without special surface treatment, but sandblasting or rust prevention can be provided as needed.
Q: What quality inspection reports are provided with Q355NHB?
A: Q355NHB is accompanied by quality inspection reports such as material certificates, performance test reports, and optional non-destructive testing reports.
