Hot Rolled Q355B H Beam Steel Profile for Construction & Structural Projects | High Strength Structural Steel Beam Supplier
| Comparison Item | Chinese GB (GB/T 1591)Q355B | European EN (EN 10025-2)S355JR / S355JO | American ASTM (A572/A572M)Grade 50 [345] |
| Naming Significance | Q: Stand for Yield strength 355: Yield value ≥355 MPa B: Quality Grade B (20°C Impact test) |
S: Structural Steel 355: Yield value ≥355 MPa JR: Impact test at 20°C JO: Impact test at 0°C |
Grade 50: Yield strength ≥50 ksi(approx. 345 MPa) |
| Yield Strength | ≥355 MPa(for thickness ≤16mm) | ≥355 MPa(for thickness ≤16mm) | ≥50 ksi(≥345 MPa) |
| Tensile Strength | 470−630 MPa | 470−630 MPa | ≥65 ksi(≥450 MPa) |
| Elongation | ≥22% (for thickness ≤40mm) | ≥22% (for thickness ≤40mm) | ≥18% (in 200mm gauge length) ≥21% (in 50mm gauge length) |
| Impact Toughness | Longitudinal impact energy at 20°C:≥34 J | JR: Impact energy ≥27 J at 20°C JO: Impact energy ≥27 J at 0°C |
Not mandatory in standard(unless requested by the buyer as a supplementary requirement, e.g., CVN test) |
| Chemical Composition (MAX) | C: ≤0.20% Mn: ≤1.60% Si: ≤0.50% P: ≤0.030% S: ≤0.030% | C: ≤0.24% (for thickness ≤40mm) Mn: ≤1.60% Si: ≤0.55% P: ≤0.035% S: ≤0.035% | C: ≤0.23% Mn: 0.50−1.35% (varies with thickness) Si: ≤0.40% P: ≤0.040% S: ≤0.050% |
| Carbon Equivalent (CEV) | ≤0.45% (Hot rolled condition) | ≤0.45% (for thickness ≤30mm) | Not rigidly limited by CEV, but strictly regulates alloying elements (V, Nb, Ti, etc.) |
| Element | Content (%) |
| Carbon (C) | ≤ 0.20–0.24 |
| Silicon (Si) | ≤ 0.55 |
| Manganese (Mn) | ≤ 1.60 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Nb + V + Ti | ≤ 0.12 |
| Chromium (Cr) | ≤ 0.30 |
| Nickel (Ni) | ≤ 0.50 |
Yield Strength (MPa)
| Thickness (mm) | Yield Strength |
| ≤ 16 | ≥ 355 |
| 16 – 40 | ≥ 345 |
| 40 – 63 | ≥ 335 |
| 63 – 80 | ≥ 325 |
| 80 – 100 | ≥ 315 |
| 100 – 150 | ≥ 305 |
| 150 – 200 | ≥ 285 |
Tensile Strength (MPa)
| Thickness Range | Tensile Strength |
| ≤ 80 mm | 470 – 630 |
| 80 – 150 mm | 450 – 600 |
| ≥ 150 mm | 450 – 600 |
Elongation
| Property | Value |
| Elongation (%) | ≥ 21–22 |
Impact Test (Q355B Grade)
| Item | Requirement |
| Test Temperature | 20°C |
| Impact Energy | ≥ 27 J |
Equivalent Steel Grades
| Standard | Equivalent Grade |
| EN | S355JR |
| ASTM | A572 Gr.50 |
Hot Rolled H Beam cross-section consists of a web (the vertical center section) and flanges (the horizontal sections on either side). The flanges have parallel inner and outer surfaces, and the transition to the web is arc-shaped. This design offers the following advantages:
Strong flexural strength: The high section modulus significantly increases the load-bearing capacity of traditional I-beams and channels at the same weight.
High structural stability: The uniform flange width provides excellent lateral stiffness, making it suitable for supporting bidirectional loads.
High material efficiency: The stress concentration problem associated with traditional steel sections is reduced, saving 10% to 30% of steel.
Parameters
| Technical Item | Specifications & Detailed Parameters |
| Standard | Chinese National Standard: GB/T 1591-2018 |
| Steel Grade | Q355B High-Strength Low-Alloy Structural Steel H Beam |
| International Equivalents | • European Standard: EN 10025 S355JR • American Standard: ASTM A572 Grade 50 • Japanese Standard: JIS G3101 SS400 (Used as a high-strength upgrade/substitution in specific construction contexts) |
| Web Height (H) | 100 mm - 900 mm (Customized sizes available) |
| Flange Width (B) | 50 mm - 400 mm |
| Web Thickness (t1) | 5 mm - 30 mm |
| Flange Thickness (t2) | 7 mm - 50 mm |
| Length | 6m, 9m, 12m, or customized lengths according to client blueprints |
| Manufacturing Process | Hot Rolled or Welded / HF (High-Frequency) Welded |
| Surface Treatment | • Bare / Black Steel • Anti-rust Primed Coating • Hot-Dip Galvanized (Provides superior corrosion resistance for outdoor applications) |
| Mechanical Properties | • Yield Strength: ≥355 MPa (for thickness ≤16mm) • Tensile Strength: 470−630 MPa• Impact Test: Longitudinal impact energy ≥34 J at 20°C |
| Quality Certification | • MTC (Mill Test Certificate) compliant with EN 10204 3.1 provided • Supports third-party on-site sampling and testing by SGS, BV (Bureau Veritas), or TUV |
| Key Applications | • Structural frameworks for large-scale industrial plants and high-rise buildings • Bridges and civil infrastructure construction• Equipment supports, foundations, and mining shoring frames • Prefabricated building systems |
- Black bare steel: Ideal for indoor use and secondary on-site processing.
- Anti-rust primer coating: Prevents oxidation and rust during ocean transportation and short-term storage.
- Hot-dip galvanizing: Creates a thick, robust zinc coating for long-term corrosion resistance. It is the optimal choice for coastal, humid, industrial and harsh outdoor environments to extend structural service life.
1. High Structural Performance & Cost Savings
Thanks to the optimized cross-section, our H-beams feature an excellent strength-to-weight ratio. Under identical load requirements, they cut steel consumption by 15%–30% versus conventional I-beams, slashing material costs and structural dead weight. The lighter frame also allows for simpler, more cost-effective foundation work, bringing down overall project expenses.
2. Full Compliance with International Standards for Easy Application
Our products meet widely recognized global specifications, including EN 10025 (S355JR/S355JO) and ASTM A572 Gr 50. Engineers and buyers can directly use them as a replacement without adjusting construction drawings, which avoids extra technical reviews and modification costs.
3. Reliable Mechanical Performance & Structural Safety
With yield strength reaching 355 MPa and tensile strength ranging from 470 to 630 MPa, the beams deliver strong load capacity, great bending rigidity and reliable seismic resistance. We strictly control carbon content and carbon equivalent, ensuring outstanding weldability for both factory processing and on-site construction, keeping steel structures stable and durable long-term.
4. Diversified Surface Treatments for Corrosion Resistance
We provide multiple surface finishes: raw black steel, anti-rust primer and hot-dip galvanizing. The uniform galvanized layer offers robust protection against corrosion, ideal for coastal, humid and harsh industrial environments. It effectively lengthens service life and lowers routine maintenance frequency.
5. Factory Direct Sales & Rigorous Quality Control
Sourced directly from the factory, we offer competitive bulk pricing with no intermediate markups. Every batch is accompanied by mill test certificates complying with EN 10204 3.1. Third-party inspections by SGS, BV, TUV and other authoritative institutions are fully supported, and product quality is fully traceable.
Civil & Commercial: High-rise skyscraper columns, airports, stadiums, and prefabricated building systems.
Industrial & Logistics: Heavy-duty crane runways, factory trusses, and wide-span logistics warehouses.
Infrastructure & Energy: Highway/railway bridges, petrochemical pipe racks, and solar/wind mounting platforms.
Marine & Heavy Machinery: Port terminals, offshore platform topsides, mining equipment frames, and foundation shoring.
Standard Packaging: Export seaworthy packing. Bundled with strong steel strips for safe handling and transit.
Surface Protection: Anti-rust oiled, primed coating, or hot-dip galvanized finishes according to customer specifications.
Identification: Waterproof product tags attached to each bundle, showing heat number, grade, size, length, and weight.
Shipping Methods: Supplied in bulk vessels (for large shipments) or packed into 20ft/40ft containers (for fixed lengths up to 11.8m).
Delivery Condition: Hot rolled or welded, fully traceable with Mill Test Certificates (MTC compliant with EN 10204 3.1).
Lead Time: 7-30 days, Fast factory direct shipping, with third-party inspections by SGS, BV, or TUV fully supported before loading.
Q1: Can GB Q355B H-beams directly replace EN S355JR and ASTM A572 Gr.50?
A: Yes. Q355B matches S355JR and ASTM A572 Gr.50 in core mechanical properties, with a minimum yield strength of 345–355 MPa. It serves as a perfect direct replacement, requiring no adjustments to structural calculations or construction drawings.
Q2: What is the impact toughness difference between Q355B and S355JO?
A: Q355B features a 20°C longitudinal impact test (≥34 J), equivalent to European S355JR grade. For cold-region projects that demand S355JO standard (0°C impact resistance), we can adjust micro-alloying components during production to meet 0°C impact requirements, with customized official mill test certificates provided for verification.
Q3: What standard lengths are offered, and how do they affect shipping?
A: Our regular stock lengths are 6m, 9m and 12m.
- Container shipment: To fit standard 20ft/40ft containers (max internal length 11.8m), we recommend lengths below 11.8m to avoid loading issues.
- Bulk vessel shipment: Full 12m lengths and custom longer sizes are available for large-scale project orders.
Q4: Are anti-corrosion surface treatments available for outdoor applications?
A: Yes. We provide flexible surface finishing options for different project scenarios:
- Black bare steel: Ideal for indoor use and secondary on-site processing.
- Anti-rust primer coating: Prevents oxidation and rust during ocean transportation and short-term storage.
- Hot-dip galvanizing: Creates a thick, robust zinc coating for long-term corrosion resistance. It is the optimal choice for coastal, humid, industrial and harsh outdoor environments to extend structural service life.
Q5: How is product quality and full traceability guaranteed?
A: All shipments support full traceability. Each batch is supplied with an official EN 10204 3.1 mill test certificate, covering complete heat number, chemical composition and mechanical performance data. We also fully support pre-loading third-party sampling and inspections by authoritative institutions including SGS, BV and TUV.
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