Flat Products
Langzo Steel is located in the Chinese steel base-Boxing city, Shandong Province, China which is a steel group company integrating steel industry and international trade, our subsidiaries are: Shandong Langzo New Materials Co., Ltd.; Vanten Metal Corporation Limited and Tangshan Jingjin ColdRolled Galvanizing Co.. Ltd.etc. Our main products are flat products of Galvanized Steel Coils, Galvalume Steel Coils, Color Coated Steel Coils, Corrugated Steel Roofing Sheet, Cold Rolled FullHard, Aluminum Color Coating Coils, Tinplate, TFS, etc and long products of Angles, channel, H beam, Wire rod, Rebar/ Deformed Bar, steel pipe, steel strips. etc.
Why Choose US
Our Factory
Tangshan Xunzhuo International Trade Co., Ltd. is a steel group company integrating the steel industry and international trade. We have 7 production lines, more than 500 employees, and a monthly production capacity of 100,000 tons, completing orders for customers efficiently and timely.
Production Market
With more than 10 years development, Xunzhuo has gained a very good reputation of our clients from Europe, Africa, Latin America, Southeast Asia and Middle East, etc.The personnel in each position of the company have more than many years of experience in foreign trade.
Quality Assurance
Professional technical quality inspection personnel conduct quality inspections on the products ordered by customers. From production, packaging to transportation, they carefully conduct quality tracking throughout the entire process to ensure that customers receive satisfactory products.
Excellent Service
We have a professional service team and a complete sales process. We promise that from the client's order to the customer's receipt of the goods, the whole process will allow clients to be 100% at ease!
Types of Flat Products
There Are Mainly the Following Types
Galvanized Sheet
Galvanized sheet, also known as galvanized steel sheet, is a versatile and widely used material in various industries and applications.
Hot Dipped Galvanized Steel Sheet
A hot dipped galvanized steel sheet is a type of steel that has been coated with a layer of zinc through a process called hot-dip galvanizing. This process involves immersing the steel sheet into a molten bath of zinc, which bonds with the steel to create a protective layer that helps to prevent corrosion and increase the sheet's lifespan.
Pre-Painted Wooden Pattern Steel Coil
Pre-Painted Wooden Pattern Steel Coil is a specific type of coated steel product, combining advanced material properties of steel with aesthetic and practical advantages.
Pre-Painted Gavalnized Steel Corrugated Sheet
Pre-Painted gavalnized steel corrugated sheet is a versatile, durable, and aesthetically appealing building material.
Hot Dipped Galvanized Steel Strip
Hot Dipped Galvanized Steel Strip is processed by ordinary steel strip pickling, galvanizing, packaging and other processes.
Galvanized Steel Roofing Panel
Classification of Galvanized Steel Roofing Panel: Profiled steel plates are usually classified in a variety of ways depending on the application site.
GL Coil
During the refining process, the substrate of theGL Coil is a steel strip for coating paint. The front and back of the color-coated plate are extremely important.
Advantages of Flat Products
Hot Dipped Galvanized Steel Sheet
1. Corrosion resistance
The corrosion resistance of hot galvanized galvanized is stronger than cold galvanized. This is because the hot -dip galvanized zinc layer is thicker and is not easily destroyed, which can more effectively protect the surface of the steel parts from corrosion.
2. Stable performance
The performance stability of hot -dip galvanized is also better than cold galvanized. During the hot galvanized process, the metal of the steel parts and the melting zinc spread to each other, forming a steel zinc alloy layer. This alloy layer has better stability and can continue to maintain the performance of steel parts.
3. Surface smoothness
The surface of hot galvanized is also more smooth, without precipitation and water stains, the gloss is better, and the appearance is more beautiful. The surface of cold galvanized is prone to sediments and spots, and the appearance is not as good as hot galvanized.
Hot Dipped Galvanized Steel Coil
1. Super protection: Galvanized steel coil can prevent corrosion on the surface of the steel plate and prolong its usable time. Every inch of galvanized steel coil is protected, even the sharp edges and hard-to-reach cracks.
2. Low maintenance: The steel that lacks protective coating needs more maintenance to keep the appearance and structure of the product safe.
3. Economically: The initial choice of galvanized steel coil may seem more expensive, but in the long run, it is a huge investment. In addition, galvanizing is actually cheaper than many other protective steel coatings.
4.Long durability: The life expectancy of the galvanized steel coating can reach 50 years, and it can withstand the exposure of cities and coastal areas.
Hot Dipped Galvanized Steel Strip
Corrosion Resistance
One of the primary benefits of galvanised steel strips is their exceptional resistance to corrosion. The zinc coating acts as a protective shield, preventing moisture, oxygen, and other corrosive elements from reaching the steel surface.
Durability
Galvanised steel strips are highly durable, capable of withstanding harsh conditions and heavy usage. The zinc coating provides a robust protective layer, making the steel strips resistant to scratches, impacts, and abrasion.
Cost-Effectiveness
Despite their remarkable properties, galvanised steel strips offer cost-effectiveness. Compared to other materials, galvanized steel strips may have a higher initial investment, but their long lifespan, low maintenance requirements, and resistance to corrosion ultimately reduce overall costs in the long run.
Versatility
Manufacturers can customize galvanized steel strips to meet specific requirements, showcasing their high versatility. They come in various thicknesses, widths, and lengths, allowing flexibility in design and application.
Step 1: Surface preparation
Thorough cleaning is necessary as zinc will only adhere to clean steel. This gets accomplished by:
Degreasing: A hot alkaline cleaner is used to remove oil, grease, dirt, loose particles, and any other contaminates that may exist on the surface of the material.
Acid pickling: An acid bath is used to remove mill scale and oxides.
Fluxing (dry kettle): Pre-fluxing in a zinc ammonium chloride solution to remove oxides and to prevent oxidation prior to dipping into molten zinc.
Step 2: Immersion in bath of molten zinc
During this step, the steel is immersed in a bath of molten zinc at approximately 830˚F. The mix in the bath consists of ~98% pure zinc and 2% additives (Al, Bi, Ni). The zinc reacts with the iron in steel and it forms a coating which is metallurgically bonded to the steel. Also, the zinc flows into recesses and other areas difficult to access, coating all areas of complex shapes thoroughly for corrosion protection. Hot dip galvanizing is the only coating system that protects tubular steel on the inside. The zinc goes “in, around, over, under and through” the fabrication.
Hot dip galvanizingThe size of zinc baths varies from galvanizer to galvanizer and this restricts the size of steel that can be galvanized. When choosing a galvanizer, make sure that the size of the zinc bath is big enough to accommodate the size of your products such as large structural shapes.
The final product is protected against corrosion as zinc creates a barrier between steel and the environment and also cathodically protects the base metal.
Step 3: Finishing
After the steel is withdrawn from the galvanizing bath, excess zinc is removed by draining, by vibrating or for small items, by centrifuging. The galvanized item is then cooled in air.
Step 4: Inspection
Steel is inspected after galvanizing to verify conformance with specs.
How Does Chemical Composition Affect Hot Dip Galvanization
To achieve a sound galvanization surface, according to ASTM A385 or ISO 1461, these important elements need to be kept at a level listed below:
√ Carbon content less than 0.25%
√ Manganese less than 1.3%,
√ Silicon less than 0.04% or between 0.15% and 0.24%
√ Phosphorus less than 0.04%.
Therefore, it is very import to evaluate the chemistry for an unfamiliar steel grade, the elemental composition of the steel in weight percentage should be estimated from the mill test reports for the heat. The elements listed in ASTM A385 should be compared according to the recommendations in order to achieve a coating which is of typical appearance and thickness. In particular, steels with silicon and phosphorus levels which are beyond the recommended levels are considered reactive steels. The silicon equivalent is used to evaluate the combined effect silicon and phosphorus have on the metallurgical reaction during hot-dip galvanizing.
Note: Silicon Equivalent = Si content + 2.5*(P content)
Below is the impact upon HDG by Silicon Equivalent
Silicon equivalent<0.04% or 0.15% - 0.22% - coating is of typical thickness and appearance.
Silicon equivalent 0.04% - 0.15% (Sandelin Steel) - vary in appearance and develop thicker coatings. If a nickel alloyed zinc bath is used, the Sandelin Effect is mitigated, resulting in a higher likelihood of bright coatings of typical coating thickness.
Silicon equivalent > 0.22% - matte gray and rough coatings of a thickness greater than the minimum requirements. See Sandelin curve to determine the level of reactivity and anticipated coating thickness.
The quality and surface finish of hot dip galvanized carbon steels are directly related to the chemistry of the components being processed. Fundamentally, two elements, being Silicon (Si) and Phosphorous (P) within carbon steel, influence the surface finish in terms of uniformity, color (shiny or matt dull grey) and relative smoothness.
FAQ
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