Q345 Channel Steel

Q345 Channel Steel is a hot-rolled structural steel channel belonging to the Chinese low-alloy high-strength structural steel grade Q345. It is one of the most widely used steel profiles in construction and industrial applications due to its excellent mechanical properties, good weldability, and cost-effectiveness.

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Detailed Description

Q345 Channel steel is a hot-rolled structural steel channel belonging to the Chinese low-alloy high-strength structural steel grade Q345. It is one of the most widely used steel profiles in construction and industrial applications due to its excellent mechanical properties, good weldability, and cost-effectiveness.

Product Name	Q345 Channel Steel
Standard	AISI, ASTM, DIN, JIS, GB,JIS, SUS, EN, etc.
Material	Q345
Surface	black painted, anti rust varnished, PE coated, anti rust oiled, galvaniZed, checkered, color coated
Commonly Used Size（h×b×d, mm）	50×37×4.5,63×40×4.8,80×43×5.0,100×48×5.3,120×53×5.5,140×58×6.0,or as per your request
h	50~400mm, according to customer's requirement
b	37~104mm,or as per your request
d	4.5~14.5mm,or as per your request
Technical Methods	Hot Rolled/Cold Rolling
Packaging	According to customer required
Application	Applied in multiple fields such as architecture, bridges, machinery, energy, etc. etc.
Packing	Standard Seaworthy Packing (Plastic film in the first layer,second layer is Kraft paper. Third layer is galvanized sheet)
MOQ	1 Ton, more quantity price will be lower

Key Characteristics and Advantages

High Strength-to-Weight Ratio: Q345 steel offers significantly higher yield and tensile strength than common carbon steels like Q235. This allows for the design of lighter structures without compromising load-bearing capacity, leading to material savings and easier installation.

Excellent Weldability and Formability: The chemical composition of Q345, which includes elements like manganese (Mn), provides good ductility. It can be easily welded using all standard methods (e.g., arc welding, gas welding) and formed into required shapes without cracking, making it highly versatile for fabrication.

Good Impact Toughness: It maintains good toughness and resistance to brittle fracture at lower temperatures, making it suitable for structures in various environmental conditions.

Cost-Effectiveness: As a readily available standard section, Q345 channel steel provides an optimal balance of performance and cost, making it an economical choice for a vast range of projects.

Chemical Composition and Mechanical Properties

A typical chemical composition (by weight, %) includes:

Carbon (C): ≤ 0.20%

Silicon (Si): ≤ 0.55%

Manganese (Mn): ≤ 1.70%

Phosphorus (P): ≤ 0.035%

Sulfur (S): ≤ 0.035%

Other alloys (V, Nb, Ti, etc.) in small quantities.

Key mechanical properties (for nominal sizes):

Yield Strength (ReH): ≥ 345 MPa (for thickness ≤16mm)

Tensile Strength (Rm): 470 - 630 MPa

Elongation (A): ≥ 21%

Impact Energy (KV2 @ 20°C): ≥ 34 Joules

Common Applications

Q345 Channel Steel is a fundamental building block in many industries:

Building and Construction: Used as frames, beams, columns, and braces in industrial plants, commercial buildings, stadiums, and bridges.

Heavy Machinery and Vehicles: Employed in the fabrication of frames for trucks, trailers, cranes, and agricultural equipment.

Industrial Structures: Ideal for constructing support frames, conveyor systems, platform girders, and storage racking systems.

Infrastructure Projects: Used in various structural components for bridges, transmission towers, and tunnel supports.

General Fabrication: A popular choice for making brackets, frames, and bases for machines and other equipment.

Available Forms and Specifications

It is primarily supplied in the standard "U" or C-shaped cross-section, defined by its depth (height of the web), flange width, and web thickness. Common specifications are designated by their dimensions, for example: 100x50x5mm (Depth x Flange Width x Web Thickness).

It is typically available in random lengths or fixed lengths as per customer requirement, with a mill scale surface. It can also be supplied shot-blasted, primed, or galvanized for enhanced corrosion protection.