In the aluminum profile industry, "quality" is the foundation of a company's market presence and the core strength for earning long-term customer trust. Since its establishment, Shandong Kangdi Aluminum has consistently prioritized quality as its core development principle. From meticulous raw material selection to every production and processing step, and finally to rigorous inspection of finished products, the company adheres to stringent standards throughout the entire process, ensuring "zero defects" through unwavering dedication. This commitment to excellence has earned it a solid reputation for quality within the industry and earned it the reputation of "reliable aluminum profiles" among its customers.
"Quality products begin with quality raw materials"—this is the unwavering belief of Shandong Kangdi Aluminum's quality management team. In aluminum profile production, the quality of the aluminum alloy raw materials directly determines key indicators such as the final product's strength, corrosion resistance, and processing performance. To select the best raw materials, the company has established a rigorous raw material supplier access and assessment mechanism to prevent substandard raw materials from entering the production process. When selecting suppliers, Shandong Kangdi Aluminum only partners with large-scale aluminum ingot manufacturers with comprehensive qualifications, a strong reputation, and stable production capacity. Each supplier undergoes multiple rounds of on-site inspections, sample testing, capacity assessments, and reputation audits. Only those that meet all these criteria are included in the company's "Qualified Supplier List." The company also regularly conducts dynamic assessments of its suppliers, providing comprehensive ratings based on factors such as raw material quality stability, delivery timeliness, and after-sales service. Suppliers with substandard scores are promptly terminated to ensure a consistently high level of raw material supply.
When raw materials arrive at the warehouse, the company's quality inspection team conducts a comprehensive inspection of each batch of aluminum ingots. These inspections include using a spectrometer to verify that the chemical composition of the ingots meets national standards, using a tensile testing machine to verify that the raw materials meet mechanical properties, and even inspecting the raw materials' appearance and dimensions. Only after all inspections pass will the raw materials enter the production workshop. If any abnormality is detected, the entire batch will be rejected, ensuring that "problematic raw materials" are not allowed to enter the next process. This "zero tolerance" approach to raw material control builds the first "firewall" for product quality.
If raw materials are the foundation of quality, then meticulous control throughout the production and processing stages is the key to transforming "good raw materials" into "good products." Shandong Kangdi Aluminum understands that aluminum profile production involves dozens of processes, including melting, extrusion, aging, and surface treatment. Even the slightest oversight in any one step can impact the quality of the final product. To this end, the company, centered around the goal of "constantly striving for excellence in every process," has established a comprehensive "Process Quality Control System" covering the entire production process, integrating quality requirements into every detail of production.
During the melting and casting process, technicians precisely mix alloying elements based on the performance requirements of each product. Using an intelligent temperature control system, they maintain a constant temperature tolerance of ±2°C, ensuring uniform composition and impurity-free molten aluminum. Samples are also retained from each batch of molten aluminum for traceability, enabling rapid identification of any quality issues. In the extrusion process, the company has introduced several state-of-the-art CNC extrusion presses, coupled with independently developed die preheating and extrusion speed control technologies. This ensures that aluminum profiles maintain stable dimensional accuracy during the forming process. For high-precision aluminum profiles, the dimensional tolerance can be controlled within 0.1mm, far exceeding the industry average.
In the surface treatment process, whether it is anodizing, electrophoretic painting, or powder coating, each step adheres to strict process parameter standards. For powder coating, for example, the company utilizes a fully automated spraying line. Before spraying, the profile surface undergoes a "triple cleaning" (degreasing, pickling, and passivation) to ensure that the surface is free of oil, dirt, and oxide layers. During the spraying process, electrostatic adsorption control and spray thickness measurement are used to ensure that the coating uniformity error does not exceed 5μm. After spraying, the coating undergoes high-temperature curing at 200°C and salt spray and impact resistance testing to ensure that the coating meets standards for adhesion and corrosion resistance. To ensure that quality requirements are met at every process, the company has implemented a "Process Quality Responsibility System." Each process has a designated "quality person." These people are required to conduct self-inspections and peer-inspections of the product quality within their respective processes. Only products that pass these self-inspections can be transferred to the next process. Furthermore, the company's quality inspection team conducts spot checks on each process at regular intervals. If any quality issues are discovered, production is immediately halted and resumed only after the problem is resolved. This "everyone manages quality, every step controls quality" model ensures that high quality becomes the norm throughout the production process.
"Before leaving the factory, products must undergo rigorous testing"—this is Shandong Kangdi Aluminum's commitment to its customers. To ensure that every aluminum profile delivered to customers is a "zero defect" product, the company has established an industry-leading "Finished Product Inspection Center," equipped with a comprehensive suite of testing equipment, including spectrometers, salt spray testers, universal material testing machines, and colorimeters, to conduct comprehensive performance and comprehensive inspections on finished products. During the finished product inspection phase, quality inspectors randomly select samples from each batch and conduct multiple tests, including appearance, dimensions, mechanical properties, corrosion resistance, and surface coating performance. For example, mechanical properties testing involves testing the tensile strength, yield strength, and elongation of the extrusions to ensure they meet customer requirements. Salt spray resistance testing involves placing the extrusions in a salt spray chamber simulating a marine climate for over 500 hours to observe for signs of surface corrosion. Appearance inspection involves using strong light and a magnifying glass to ensure the extrusions are free of scratches, bubbles, and color variations.
For customized products with special requirements, the company also conducts specialized testing. For example, aluminum extrusions for battery packs produced for new energy vehicle customers undergo, in addition to routine testing, airtightness testing and vibration fatigue testing to ensure they can withstand the complex operating conditions of the vehicle. Aluminum extrusions produced for medical equipment clients undergo additional surface testing for antimicrobial properties and cleanliness to ensure they meet the stringent standards of the medical industry. Only when all test items pass can a product be labeled "qualified" and shipped. If any indicator is found to be substandard, the entire batch is temporarily stored while the technical team analyzes the cause and develops a corrective plan. After the correction, the product is retested until it passes the test. For many years, Shandong Kangdi Aluminum has maintained a 100% product qualification rate. This commitment to "quality assurance through testing, trust through quality" has earned the company long-term recognition from customers. Many long-time customers with over 10 years of cooperation say, "I choose Kangdi Aluminum products because I feel assured and never have to worry about quality issues."
At Shandong Kangdi Aluminum, quality management is more than just a set of systems and processes; it is a deeply ingrained "cultural gene" within every employee. Through regular activities such as quality training, quality case sharing sessions, and skills competitions, the company integrates the "quality-first" philosophy into every employee's daily work. Upon joining the company, new employees first undergo a week-long "Quality Awareness Training" to learn about the company's quality standards, inspection procedures, and quality incident cases, understanding the harm that substandard products can cause to customers and the company. Veteran employees participate in "Skills Enhancement Training," learning new quality control techniques and process optimization methods to continuously enhance their ability to resolve quality issues. The company also holds monthly "Quality Star" selections to recognize and reward employees who demonstrate outstanding performance in quality control, process improvement, and hazard detection, ensuring that "valuing and pursuing quality" becomes a conscious action for all employees.
This deep-rooted quality culture has also fostered in employees the habit of proactively identifying problems and making suggestions. Last year, a veteran worker in the extrusion workshop noticed that a certain type of profile occasionally developed tiny surface scratches after extrusion. He proactively reported this to the technical department and, drawing on his years of experience, proposed an improvement: adjusting the die exit angle. After testing and verification, the technical team adopted this suggestion, completely resolving the scratching issue, improving product quality and reducing scrap rates. Such "quality improvement cases" occur almost daily at Shandong Kangdi Aluminum.
From meticulous raw material selection, to continuous improvement in production processes, to meticulous finished product testing, Shandong Kangdi Aluminum has demonstrated the profound meaning of "quality first" through its unwavering commitment for twenty years. Going forward, the company will continue to improve product quality with stricter standards, more refined management, and more innovative technologies. With "zero-defect" aluminum profiles, it will create greater value for customers and inject "Kangdi Power" into the high-quality development of the aluminum profile industry.
No 1066,Donghuan Road,Linqu County,Shandong Province,China
KANGDI
Copyright © 2025 by Shandong Kangdi Aluminum Industry Co., Ltd. All Rights Reserved
