Various Size I-Beams in Stock for Wholesale

Excellent Mechanical Properties: The optimized cross-sectional design distributes material far from the neutral axis, resulting in a very high section modulus and moment of inertia with minimal material use. It primarily resists vertical bending loads, offering outstanding anti-bending capacity.

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1. Excellent Mechanical Properties: The optimized cross-sectional design distributes material far from the neutral axis, resulting in a very high section modulus and moment of inertia with minimal material use. It primarily resists vertical bending loads, offering outstanding anti-bending capacity.
2. Standardized Series: Manufactured in compliance with national standards (e.g., GB/T 706-2016), they form a complete model series from I10 to I63. The sectional dimensions (height, flange width, web thickness), theoretical weight, and sectional properties (e.g., moment of inertia, section modulus, radius of gyration) for each model are strictly defined, providing reliable data for structural design and calculation.
3. High Strength and Workability: Primarily made from common steels like Q235B and Q355B, they offer a good combination of strength, plasticity, and toughness. They are easily cut, drilled, welded, and bolted, meeting the processing and installation requirements of diverse engineering structures.
4. Cost-Effectiveness: The hot-rolling process is highly efficient and relatively low-cost. Their high strength-to-weight ratio reduces the structure's dead weight, lowering foundation and transportation/installation costs, resulting in significant overall economic benefits.

Product Details

Model number：

（GB/T 706-2016）l10-l63

Dimensions（mm）：

Applications：

I-beams are widely used in various construction and engineering structures:

● Building Structures: Primarily used as load-bearing beams and columns in industrial and civil buildings, such as the steel frames of factory buildings and the beams and columns of high-rises. Their excellent bending resistance makes them ideal for carrying vertical loads.

● Bridge Engineering: Used in bridge superstructures (main girders, stringers) as the primary load-bearing components.

● Vehicle Manufacturing: Used as chassis frames (longitudinal beams) for vehicles (e.g., trucks, railway wagons), providing strong support and torsional stiffness.

● Mechanical Equipment: Commonly used to manufacture the bases, brackets, and frame structures of various heavy machinery equipment.

● Temporary Structures and Support: Used for constructing temporary platforms, support structures, and scaffolding systems during construction.

Technology：

● Manufacturing Technology:

◦ Hot-rolling Technology: The primary manufacturing process. Heated steel billets are passed through a series of section mills to roll them into the final "I" shape. This technology is efficient and relatively low-cost.

◦ Welding Technology: For non-standard or extra-large sizes, welding technology can be used to join three steel plates (two flanges, one web) into an "I" shape.

● Fabrication and Connection Technology:

◦ Cutting: Typically performed using flame cutting or sawing.

◦ Connection: Mainly involves welding and high-strength bolting to meet structural integrity requirements.

● Post-processing Technology:

◦ Anti-corrosion Technology: Crucial for longevity. Common methods include spraying anti-rust paint and hot-dip galvanizing to extend service life in harsh environments.

◦ Fireproofing Technology: In building applications, applying fire-resistant coatings is often necessary to achieve the required fire resistance rating.

Standards：

● Chinese Standard (GB): GB/T 706-2016 "Hot-rolled section steel" is the most core standard in China. It specifies in detail the dimensions, shape, weight, permissible deviations, and technical requirements for the series, models, and parameters of hot-rolled I-beams.

● International Standard (ISO): ISO 657-1 applies to hot-rolled steel (Dimensions and static properties for sections), serving as a universally recognized international reference standard.

Industry applications

FAQ

Q: What is a hot-rolled I-beam?

A: A hot-rolled I-beam is a long steel section with an "I"-shaped cross-section, formed by passing a steel billet through a series of rolls at high temperatures (typically above 1200°C) in a single continuous process. This process gives it a inherent grain structure that provides good strength, toughness, and weldability.
Q: What are the main advantages of hot-rolled I-beams?

A: Its main advantages include:
● High Strength-to-Weight Ratio: Structurally efficient, capable of supporting large loads with a relatively light self-weight.
● Cost-Effectiveness: The hot-rolling process is mature, efficient, and relatively low-cost.
● Ease of Fabrication and Installation: Can be easily cut, welded, drilled, and bolted.
● Abundant Supply and Standardized Specifications: Models are serialized, making them easy to procure and select for design.
Q: What are the common materials for hot-rolled I-beams?

A: The most common materials are carbon structural steel and high-strength low-alloy steel.
● Chinese Standards: Q235B (most common, good overall properties), Q355B (higher strength, used for heavier structures).
● International Standards: Such as ASTM A36 (USA), ASTM A572 Gr. 50 (USA), etc.
Q: How to interpret the model designation, for example, I25b?

A: Taking I25b as an example:
● "I": Stands for I-beam.
● "25": Represents the nominal height, meaning the cross-sectional height is approximately 25 centimeters (250 mm).
● "b": Is a classification code. Under the same height (e.g., all 250mm high), letters a, b, c are used to differentiate between flange widths and web thicknesses. Usually, type 'a' has a thinner web, 'b' is intermediate, and 'c' has a thicker web.
Q: What surface treatments are required for hot-rolled I-beams?

A: To prevent corrosion and extend service life, surface treatment is usually necessary:
● Painting/Coating: The most common method, applying an anti-rust primer first, followed by a topcoat.
● Hot-Dip Galvanizing: Provides long-lasting anti-corrosion protection, suitable for outdoor, humid, or corrosive environments.
● Fire-Resistant Coating: Used in construction to improve the fire resistance rating of members.
Q: Can hot-rolled I-beams be welded?

A: Yes, hot-rolled I-beams have good weldability. However, attention must be paid to:
● Using welding electrodes that match the base metal.
● Preheating and/or post-heating may be required for high-strength low-alloy steels (e.g., Q355B) to prevent cracking.
● Following standard welding codes and procedures.