Q235 steel is a widely used low-carbon structural steel in China and internationally. It is non-alloyed, meaning no special alloying elements are added, and it is known for its excellent weldability, good plasticity, reliable structural strength, and cost-effectiveness.
The "Q" in Q235 stands for yield strength, and 235 MPa refers to its minimum yield point, making it suitable for industrial construction, bridges, factories, ships, and general engineering projects.
H-Beams made from Q235 steel are commonly used in steel structure frameworks, industrial facilities, warehouse buildings, bridge components, and heavy machinery supports. The steel is produced without heat treatment and is mainly available in hot-rolled plates, H-beams, I-beams, and steel sections, but not in seamless pipes.
Technical Specifications
Place of Origin: Shandong, China
Material Grade: Q235 (carbon steel)
Alloy: Non-alloy
Production Technique: Welded, Hot Rolled Molding
Shape: H-Channel / H-Bar
Length: 1–12 m (customized available)
Web Width: 100–900 mm (customized)
Web Thickness: 6–16 mm (customized)
Flange Width: 50–300 mm (customized)
Flange Thickness: 8–28 mm (customized)
Beam Thickness: 5–70 mm (customized)
Standard: ASTM, GB, EN, JIS, AISI
Tolerance: ±1%
Brand: Gnee
Mechanical and Chemical Properties of Q235
Q235 steel has reliable structural properties suitable for H-Beams and I-Beams:
Yield Strength (ReL): ≥235 MPa
Tensile Strength (Rm): 370–500 MPa
Elongation: 26–33%
Impact Performance: Depends on grade (A/B/C/D), with Q235B tested at +20°C
Typical Chemical Composition (Q235B):
Carbon (C) ≤ 0.22%
Manganese (Mn) 0.3–0.7%
Silicon (Si) ≤ 0.35%
Phosphorus (P) ≤ 0.045%
Sulfur (S) ≤ 0.045%
The low carbon content ensures excellent weldability, good plasticity, and low risk of brittle fracture, making it suitable for welding, bending, cutting, and punching during construction.
Products Applications
Q235 H-Beams are widely used in:
Industrial buildings and factory structures
Bridges and auxiliary structures
Shipbuilding and marine engineering
Warehouses and logistics centers
Heavy machinery and equipment supports
Steel residential buildings
Columns, beams, and load-bearing structural elements
Their hot-rolled manufacturing process provides high load-bearing capacity, uniform structural strength, and reliable performance under bending and compression forces.
Processing & Services
Bending, Welding, Decoiling, Punching, Cutting
Invoicing: based on theoretical weight
Sample: freely available
MOQ: 5 Tons
Packing: Sea-worthy bundle suitable for export
Delivery Time: within 7 days
Payment Terms: 30% T/T Advance + 70% Balance
Key Advantages
High Structural Efficiency: H-shaped beams distribute loads evenly, reduce bending stress, and provide excellent compression stability.
Excellent Weldability: Carbon content and non-alloyed composition allow easy welding with minimal risk of cracking.
Customizable Sizes: Wide range of lengths, widths, and thicknesses for various industrial and construction requirements.
Cost-Effective: Ideal for large-scale construction due to high performance at relatively low cost.
Durable and Reliable: Hot-rolled production ensures consistent quality and long-term stability
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1. Why is Q235 steel widely used in construction?
Q235 steel is a low-carbon, non-alloy structural steel that provides a good balance of strength, ductility, and weldability at an affordable cost. Its properties make it suitable for bridges, factories, warehouses, shipbuilding, and general structural applications, especially where heavy loads are not required.
2. What does the "B" in Q235B mean?
The letter indicates the impact test temperature for toughness.
Q235B is tested at +20°C, making it suitable for normal temperature environments.
Other grades, like C and D, are tested at 0°C and –20°C respectively, for cold-weather applications. The grade affects impact toughness, while overall strength and weldability remain consistent.
3. Can Q235 steel be heat treated?
No special heat treatment is required for Q235 steel. It is designed to be used in the as-rolled condition, which simplifies fabrication and reduces project costs. Its low carbon content ensures good toughness without additional processing.
4. What fabrication processes are suitable for Q235 H-Beams?
Q235 H-Beams are highly versatile and can undergo:
Cutting and drilling for on-site adjustments
Welding without preheating
Bending for custom structural forms
Punching or decoiling for connection holes
This makes Q235 beams ideal for modular steel construction and prefabricated structures.
5. How does Q235 perform in cold climates?
For cold-weather applications, Q235C or Q235D are recommended because they maintain impact toughness at 0°C and –20°C respectively. Q235B, tested at +20°C, is best for temperate or indoor conditions.
6. Is Q235 suitable for outdoor structures?
As a carbon steel, Q235 is prone to rust if left unprotected. To extend service life in outdoor conditions:
Apply anti-rust coatings or primer
Use paint systems such as epoxy or polyurethane
Consider hot-dip galvanizing, which can provide 15–25 years of protection
7. How do Q235 H-Beams compare with higher-strength steels like Q355?
Q235 has a yield strength of 235 MPa, suitable for medium-load structures.
Q355, with a yield strength of 345 MPa, is better for heavy-load applications, long spans, or seismic-resistant structures.
Q235 is more economical and easier to process, making it the preferred choice for general construction projects.
