Cable trays are important infrastructure used for cable laying and protection in power, communication, and industrial facilities, and their quality directly affects the stability and safety of the entire power system. In order to ensure the performance and long-term service life of cable tray products, cable tray manufacturers need to follow a series of strict standards and regulations when purchasing raw materials.
1、 Basic requirements for raw material procurement
The selection and procurement of raw materials are crucial links in the production process of cable trays. Common materials for cable trays include steel, aluminum alloy, hot-dip galvanized sheet, stainless steel, etc. When purchasing these raw materials, manufacturers need to meet the following basic requirements:
Chemical composition and physical properties of materials
The chemical composition and physical properties of raw materials must meet the design requirements of cable trays. For example, the strength, toughness, corrosion resistance, etc. of steel should meet the load-bearing and environmental adaptability requirements of the bridge.
Thickness and size requirements for materials
The thickness and size of steel plates or aluminum alloy plates must be consistent with the product design. Raw materials that do not meet the standards cannot meet production needs and may affect the load capacity and service life of the bridge.
Surface quality of materials
The surface of raw materials should be flat and smooth, without obvious defects such as cracks, bubbles, scratches, etc., which may affect subsequent processing, surface treatment, and the aesthetics of cable trays.
Source of materials and supplier qualifications
Manufacturers should choose raw material suppliers with good reputation and complete qualifications. Suppliers should have a strict quality control system and be able to provide qualified material testing reports and relevant certificates.
2、 Procurement standards for different materials
The raw materials for cable trays mainly include carbon steel, stainless steel, aluminum alloy, hot-dip galvanized sheet, etc. Different materials have different procurement standards, which will be analyzed one by one below:
1. Carbon steel (cold-rolled steel, hot-rolled steel)
Carbon steel is one of the commonly used materials in cable trays. According to their different application requirements, carbon steel can be divided into cold-rolled steel and hot-rolled steel. When purchasing carbon steel, manufacturers should pay attention to the following standards:
Chemical composition: The chemical composition of carbon steel is the basis of its mechanical properties, mainly including elements such as carbon (C), silicon (Si), manganese (Mn), etc. The content should be controlled according to standard requirements to ensure the strength and durability of the bridge.
Steel grades: Common steel grades include Q235, Q345, etc. Different grades of steel have different tensile and yield strengths, and manufacturers choose the appropriate grade based on the load-bearing requirements of the bridge.
Corrosion resistance: Although carbon steel itself is prone to rusting, its corrosion resistance can be improved through galvanizing treatment. For cable trays that need to be used in humid or highly corrosive environments, hot-dip galvanized steel should be selected.
The standards of cable tray manufacturers in raw material procurement
2. Stainless steel
Stainless steel is commonly used in the production of cable trays, especially in highly corrosive environments, due to its excellent corrosion resistance and long service life. When purchasing stainless steel, manufacturers need to pay attention to the following points:
Material grade: Common materials for stainless steel include 304, 316, 310, etc. 304 stainless steel has good corrosion resistance, while 316 stainless steel is suitable for more harsh environments such as chemical plants, marine environments, etc.
Surface treatment: Stainless steel surfaces generally require smoothness and no defects, and the quality of the surface directly affects the appearance and corrosion resistance of cable trays.
Thickness and hardness: The thickness of stainless steel is usually determined based on the usage environment and the load-bearing requirements of the bridge. Different thicknesses of stainless steel correspond to different hardness levels, and manufacturers need to choose according to the product specifications.
3. Aluminum alloy
Aluminum alloy has a relatively light weight and good corrosion resistance, making it suitable for cable trays that require light weight and are not exposed to harsh environments. The procurement standards for aluminum alloy materials are as follows:
Alloy composition: The main component of aluminum alloy is aluminum, and common alloy series include 1XXX series (pure aluminum), 6XXX series (aluminum magnesium alloy), etc. Different series of aluminum alloys have varying strengths and corrosion resistance.
Corrosion resistance: Aluminum alloys have good oxidation resistance in natural environments, but in certain special environments, aluminum alloys may require additional surface treatment to enhance their corrosion resistance.
Processing performance: Aluminum alloys are relatively soft and easy to process, but it is important to ensure that they have good mechanical processing performance during procurement, allowing for smooth cutting, bending, and welding.
4. Hot dip galvanized sheet
Hot dip galvanized sheet is widely used in cable trays, mainly to improve the corrosion resistance of the trays. When purchasing hot-dip galvanized sheet, the following factors should be considered:
Galvanized thickness: The thickness of hot-dip galvanizing directly affects the anti-corrosion ability of the material. Generally speaking, the larger the galvanized thickness, the stronger the anti-corrosion performance. Different thicknesses of galvanized layers are required in different environments.
Zinc layer adhesion: The adhesion of the zinc layer should meet the standard requirements. If the zinc layer is not firm, it is easy to fall off, which affects the anti-corrosion effect.
Substrate quality: The substrate of hot-dip galvanized sheet is usually carbon steel, so it is necessary to ensure that the quality of the substrate meets the standards to avoid unstable bridge quality caused by substrate problems.
3、 Quality control in procurement
In the process of purchasing raw materials for cable trays, manufacturers need to strictly control the quality of materials to ensure product performance and service life. The measures for quality control include:
Supplier Audit and Certification
When selecting raw material suppliers, manufacturers should conduct strict audits and require suppliers to provide relevant certifications, such as ISO 9001 quality management system certification, ISO 14001 environmental management system certification, etc. These certifications can effectively ensure the production capacity and product quality of suppliers.
Incoming Inspection
All purchased raw materials need to undergo strict incoming inspection before entering the factory. The inspection items include chemical composition, physical properties, dimensional tolerances, surface quality, etc. For materials that do not meet the standards, they should be returned or replaced in a timely manner.
third-party testing
Some key materials may need to be sent to third-party testing agencies for independent testing to ensure compliance with relevant national or industry standards.
Material Traceability
In order to ensure product quality, manufacturers usually establish a material traceability system, numbering each batch of raw materials to ensure that specific raw material sources can be traced in case of quality issues.
4、 Environmental Protection and Sustainability Requirements
With the increasingly strict environmental regulations, cable tray manufacturers also need to consider environmental requirements when purchasing raw materials. Choosing environmentally friendly and recyclable raw materials not only complies with relevant laws and regulations, but also enhances the market competitiveness of products. Specifically, it includes:
Harmless materials
The purchased raw materials should meet environmental protection requirements and not contain harmful substances such as heavy metals, lead, cadmium, etc., to ensure that the products will not cause pollution to the environment during use.
Recyclability of materials
Priority should be given to recyclable materials such as aluminum alloy and stainless steel, which have good reusability and meet the requirements of modern industry for resource conservation.