About Color Painting Color-coated steel sheets, also known as coated sheets or color steel sheets, are products made by using metal coils as the substrate. Various organic coatings are continuously applied to the substrate after surface pretreatment and then baked and cured. They not only have colorful decorative effects but also possess excellent durability, corrosion resistance, and formability. After color-coated steel sheets were first introduced in the United States in 1936, they were initially used for movable blinds, rain shields, etc. Starting from the 1950s to 1960s, relatively complete production and processing industries for color-coated steel sheets were established in the United States, Japan, and Europe, with a steady increase in production volume. The production process has also been improved from the initial one - coating and one - baking to two - coating and two - baking or three - coating and three - baking. Color-coated steel sheets are widely used in construction, automobiles, containers, instrument casings, and other fields. In the late 1980s, Baosteel produced the first batch of color-coated steel sheets in mainland China. Classification of Applications Composition of the Coating The coating of color-coated steel sheets generally consists of resins, pigments, solvents, additives and other raw materials. The durability and corrosion resistance of color-coated steel sheets are most closely related to the resins and pigments, while the rich colors of the coating are associated with the pigments. Types of Coatings According to the different coatings of color-coated steel sheets, the coatings can be divided into three categories: topcoat, primer and backcoat, and the corresponding coating types and functions are different. Primer The commonly used primers for color-coated steel sheets are mainly divided into three types: polyester, polyurethane and epoxy. There are certain differences in aspects such as adhesion, flexibility and corrosion resistance among different primers. Backcoat At present, the commonly used coating structures are 2/1, 2/2 and 2/1M. For the 2/1 and 2/1M structures, foaming and adhesion on the back are required. Generally, the backcoat has relatively low requirements for weather resistance and corrosion resistance. In the 2/2 coating structure, polyester coating is usually used. For some special requirements, different backcoats can be selected through negotiation. Product Specifications About Color Coating Production Line The annual designed production capacity of Shinmade's color-coated production line is 150,000 tons, and it has multi-faceted advantages. 1、The Siemens electrical control system ensures more stable production. 2、Equipped with a weld seam or riveted joint tracking system, the production operation is smoother. 3、The coating machine is equipped with a pressure sensor, enabling more precise control of the product's paint film. 4、Three-roll coating is applied on the front side, making the thickness of the paint film on the product surface more uniform and the paint surface texture more aesthetically pleasing. 5、The extra-long oven allows for precise temperature control, ensuring more complete curing and cross-linking of the paint. 6、With the installation of a tension leveler, the shape of the product panels is better guaranteed.
About Galvalume Steel Coil Galvalume steel sheets generally refer to steel sheets with a 55% aluminum - zinc coating. That is, aluminum (for passivation protection) is added to the zinc - based coating on the steel sheet. The coating composition is 55% aluminum, 43.5% zinc, and 1.5% silicon. It has excellent resistance to atmospheric corrosion, and its corrosion resistance is 2 - 4 times that of galvanized sheets with the same coating thickness. It also has the high - temperature corrosion resistance of aluminum sheets. The 55% aluminum - zinc coating was first introduced by Bethlehem Steel Corporation in the United States in the late 1960s and was first commercially produced in 1972, with the trademark name Galvalume, abbreviated as GL. The plating bath temperature is about 595 - 605°C. Silicon is added to prevent the growth of a brittle iron - aluminum - zinc alloy layer. It is used for building roofs, walls, automobiles, household appliances, or as the substrate for color coating. Classification of Applications Galvalume Steel Coil Characteristics Corrosion Resistance The corrosion resistance of galvalume alloy steel sheets stems from the barrier - protection function of aluminum and the sacrificial - protection function of zinc. When zinc provides sacrificial protection at cut edges, scratches, and abraded coating areas, aluminum forms an insoluble oxide layer, playing a barrier - protection role. Long - term atmospheric exposure tests of 55% aluminum - zinc coating in various regions around the world, such as rural areas, industrial areas, general coastal areas, and harsh marine areas, have confirmed that, with the same coating thickness, 55% aluminum - zinc coating is 2 - 4 times more corrosion - resistant than galvanized coating. Heat Resistance The heat resistance of galvalume alloy steel sheets is superior to that of galvanized steel sheets. It can be used in high - temperature environments up to 315°C without discoloration or contamination, while galvanized steel sheets are not suitable for environments above 230°C. The 55% aluminum - zinc alloy steel sheet has a high reflectivity, making it a heat barrier, with excellent high - temperature oxidation resistance and heat reflectivity. Formability The galvalume alloy coating has a higher hardness than the galvanized coating. However, due to its excellent adhesion to the steel sheet, as long as the minimum bending radius and lubricating oil coating operations as specified are followed, it still has the same formability as galvanized steel sheets, meeting the requirements for applications such as drawing quality (DQ) and deep drawing quality (DDQ) materials. Paintability Galvalume steel is highly suitable for painting applications. Its unique coating structure can provide excellent paint film adhesion and good ductility, showing outstanding performance. Weldability Since the aluminum content in the galvalume coating reaches 55%, the welding conditions differ from those of general galvanized steel sheets. Welding current, welding cycle, and welding pressure should be adjusted. Suitable welding methods include: a. Resistance spot welding; b. Projection welding; c. High/low - frequency welding; d. Gas metal arc welding (It is a welding method where a consumable welding wire is continuously fed to generate arc heat with the base metal, melting the weld bead. Then, a shielding gas is used around the arc and the weld pool. It was initially called MIG (Metal Inert Gas) welding. Later, to adapt to the welding of various materials, various mixed - gas shielding welding methods were developed, also known as MAG (Metal Active Gas) welding). Product Specifications Production Process Pre-treatment: After uncoiling, the steel coils pass through the degreasing section and reduction furnace, where they are cleaned and reduced to a level that is suitable for the next process of galvanizing. Central section: After passing through the zinc pot, the zinc layer is plated on the surface of the steel coils, and then cooled and shaped in the cooling tower. Post-treatment: After skin-passing, tension-leveling, and passivation, the coils will be rolled onto the coilers. About Galvalume Steel Coil Production Line Shinmade owns 2 galvalume production lines with an annual designed production capacity of 550,000 tons. 1、Siemens electrical control system 2、German EMG correction CPC/EPC system 3、l9-stage cleaning system 4、High-efficiency electrolytic cleaning and magnetic filtration 5、Ultra-long horizontal annealing furnace 6、Protective gas heating system 7、Dual zinc pot configuration 8、Zinc ash removal device 9、Advanced air knife system 10、Online X-Ray coating thickness measurement gauge 11、lWet finishing design (skin- pass strength 5000kN） 12、Double-bending and tension-leveling ( wet leveling and straightening )process 13、Double coating (passivate and AFP) and baking configuration
About Zinc Aluminum Magnesium Zinc - aluminum - magnesium coated steel sheets refer to coated steel sheets where a certain amount of Al and Mg is added to the hot - dip galvanized coating, or a certain amount of Mg element is added to the hot - dip galvalume coating. They are characterized by high corrosion resistance and high cut - edge protection. Results of publicly available laboratory acceleration tests and outdoor exposure tests show that within a certain range, an increase in the content of Al and Mg can improve corrosion resistance by several to more than ten times. Another major advantage after adding Mg to the coating is the enhanced corrosion resistance of the cut edges of the steel sheet. The Zn - based corrosion products containing Mg will cover the surface of the cut edge, thus protecting the cut. Zinc - aluminum - magnesium products are usually classified into three categories according to the aluminum content in the coating: low - aluminum products, medium - aluminum products, and high - aluminum products. Prodect Specifications Mechanism of Corrosion Resistance A large number of experiments verify that AZM products have excellent corrosion resistance and are the trend in the construction field. The reasons are as follows: · Zinc provides sacrificial protection; · Aluminum provides passivation protection; · Magnesium,together with zinc and aluminum are to reduce the consumption rate of the coating. The MgZn2 formed above the coating forms an insulating protective layer at the cut and cross section; · Mg2Si formed below the coating provides barrier protection inside the coating, preventing water vapor from entering the substrate, greatly improving the corrosion resistance. Production Process Pre-treatment: After uncoiling, the steel coils pass through the degreasing section and reduction furnace, where they are cleaned and reduced to a level that is suitable for the next process of galvanizing. Central section: After passing through the zinc pot, the zinc layer is plated on the surface of the steel coils, and then cooled and shaped in the cooling tower. Post-treatment: After skin-passing, tension-leveling, and passivation, the coils will be rolled onto the coilers. Production Equipment 1、Siemens electrical control system 2、German EMG correction CPC/EPC system 3、l9-stage cleaning system 4、High-efficiency electrolytic cleaning and magnetic filtration 5、Ultra-long horizontal annealing furnace 6、Protective gas heating system 7、Dual zinc pot configuration 8、Zinc ash removal device 9、Advanced air knife system 10、Online X-Ray coating thickness measurement gauge 11、lWet finishing design (skin- pass strength 5000kN） 12、Double-bending and tension-leveling ( wet leveling and straightening )process 13、Double coating (passivate and AFP) and baking configuration
About Cold-rolled Steel Sheet Coil Cold-rolled steel sheets have good properties. We can get the cold-rolled steel sheets with thinner thickness and better tolerance control by rolling the hot-rolled steel sheets. With high flatness, gloss and bright surface,cold-rolled steel sheets are easier to be coated and processed. Cold-rolled steel sheets are mainly used in the packaging industry and used as the substrates of galvanized steel sheets, galvalume steel sheets and Zn-Al-Mg alloy coated sheets. Product Specifications About Cold-rolled Steel Lines Shinmade has 7 cold-rolled production lines with an annual capacity of 1.4 million tons. The production specification ranges from 600-1300mm in width, 0.06-2.0mm in thickness with a tolerance of ±0.01mm. The production lines are equipped with Fuzzy shape control systems, the shape measuring rollers made by ABB in Switzerland, R-700 PLC systems developed by Hitachi, and advanced PCS7 thickness control systems of Siemens.
Shinmade products can be used in industrial plants, gymnasiums, airports, stations, indoor partitions, warehouses, elevators, metal curtain walls and other places, and are exported to more than 20 countries and regions.
The 2nd phase of the 137th session of the Canton Fair concluded in Guangzhou on April 27. As a key indicator of China's foreign trade, this Canton Fair drew over 200,000 buyers from 219 countries and ...
Read more
Exhibition Preview CHINA IMPORT AND EXPORT FAIR Date： 2025/04/23 - 04/27 Address： Guangzhou-China Import and Export Complex. Booth： BZ 12.1 K33-34, 12.1 L11-12 ...
Read more
Recently, the laboratory of Shinmade Technology Materials Co., Ltd. was rigorously reviewed by the expert evaluation team appointed by the China National Accreditation Service for Conformity Ass...
Read more
On February 27th, the "2025 Steel China Third East China Metal Sheet Industry Conference" was held in Wuxi, Jiangsu. As a supporting unit of this conference, Shinmade is exploring new paths of develop...
Read more
It is known from Tianjin Custom that 544 batches of iron ore were imported at Tianjin port during the first half of 2020, totally reaching 37.859 million tons, increased by 20.6% and 13.6% respectivel...
Read more
With the EU recovering from Covid-19, it plans to modify its import restrictions on steel to deter any unhealthy market situation. The proposal will modify the EU import restrictions published two yea...
Read moreEmail :
info@shinmade.com
Shinmade,focusing on product quality and customer service,consist on the service concept of “all for customer’s convenience, confidence and honor”. We aim to strengthen regional competitiveness and sheet-strip brand establishing by transforming and upgrading to green, ecology and intellectual industry.
Scan To Wechat
English
русский
español
português
العربية
日本語
한국의
ไทย
Tiếng việt
Indonesia
Українська
