Address：Shandong Keman Import and Export Co., Ltd.
Black square tube
Houses, bridges, metal structures, uses
According to your size, we stock A513 or A500 Grade B
Classification :
PRODUCT DETAILS
Keywords: Keman Import and Export
Product introduction
If the cold rolled steel is heated to the annealing temperature, the surface color becomes black due to high temperature contact with air, it is called black annealing; Its surface is black without light treatment; The physical properties become soft, which is convenient for further welding into steel pipes; The common hardness is 57HRB, which can also be reduced to different hardness as required.
The black retreat square tube is a treated A3 square tube, which is designed to prevent the square tube from rusting; When the treated black square tube is welded, it will tear if it is not well treated. Of course, this kind of situation is relatively rare. There are many reasons for tearing, such as water on the surface of the welding matrix, rust on the surface, incorrect selection of welding rod, etc; In terms of performance, it is similar to stainless steel square tube; However, stainless steel looks more high-end, but the cost is much higher.
Packing And Delivery
Since its establishment, the company has always focused on the import and export trade of the steel industry and has established an extensive and stable domestic and foreign sales network. With a keen insight and accurate grasp of market trends, it continuously optimizes its product structure to meet the diverse needs of different customers.
QUALITY DETECTION
Our products are exported to many countries including Saudi Arabia, Iran, Russia, Turkey, Chile, Mexico, Brazil, Germany, Canada, Kuwait, Poland, Uzbekistan, Egypt, South Africa, Azerbaijan, etc. Strict testing is carried out before each shipment to ensure product quality.
CUSTOMER FEEDBACK
Over the years, the company has won wide recognition and trust from domestic and foreign customers with its good reputation, high-quality products, and professional services. Its business scope has been continuously expanded, and its mar
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