Quality Stainless Steel Sheet & Steel Tin Plate Factory

The term “stainless steel” is used to describe more than two hundred different grades, with each one tailored to give outstanding performance in specific applications. All metals react with oxygen in the air or water to form a film or oxide on the surface.   The oxide formed on ordinary steel allows the oxidation to continue producing the typical rusty appearance. However, since stainless steels contain more than 10.5% chromium, the characteristics of the oxide are changed. The chromium reacts with oxygen in the air or water to form the protective passive layer. The passive film is self-healing (in most situations) if damaged. Nickel improves corrosion resistance and formability, and molybdenum improves resistance to localized corrosion.   Stainless steel surfaces can show rusty stains if ferrous contamination on the surface prevents the formation of a continuous passive film. Furthermore, accumulation of dirt may lead to concentrations of corrosive substances that can break down the passive film.  

The final operation after fabrication or heat treatment is cleaning to remove surface contamination and restore corrosion resistance of the exposed surfaces. Degreasing to remove cutting oils, grease, crayon markings, fingerprints, dirt, grime and other organic residues is the first step.   DEGREASING Non-chlorinated solvents should be used in order to avoid leaving residues of chloride ions in crevices and other locations where they can initiate crevice attack, pitting, and/or stress corrosion later on when the equipment is placed in service.   MACHINED COMPONENTS After degreasing, machined components are sometimes “passivated” in 10% nitric acid. Nitric acid enhances the natural oxide surface film.   FABRICATIONS After degreasing, metallic surface contaminants such as iron embedded in fabrication shop forming and handling, weld splatter, heat tint, inclusions and other metallic particles must be removed in order to restore the inherent corrosion resistance of the stainless steel surface. Nitric-HF pickling, (10% HNO3, 2% HF at 49C to 60C (120 to 140F), is the most widely used and effective method removing metallic surface contamination. Pickling may be done by immersion or locally using a pickling paste.   ELECTRO POLISHING Electro polishing is using oxalic or phosphoric acid for the electrolyte; a copper bar or plate for the cathode can be equally effective. Electro-polishing may be done locally to remove heat tint alongside of welds or over the whole surface. Both pickling and electro polishing remove a layer several atoms deep from the surface. Removal of the surface layer has the further benefit of removing surface layers that may have become somewhat impoverished in chromium during the final heat treatment operation.   GLASS BEAD OR WALNUT SHELL BLASTING Glass bead or walnut shell blasting are very effective in removing metallic surface contamination without damaging the surface. It is sometimes necessary to resort to blasting with clean sand to restore heavily contaminated surfaces such as tank bottoms, but care must be taken to be certain the sand is truly clean, is not recycled and does not roughen the surface. Steel shot blasting should not be used as it will contaminate the stainless steel with an iron deposit.   Stainless steel wire brushing or light grinding with clean aluminum oxide abrasive discs or flapper wheels are helpful. Grinding or polishing with grinding wheels or continuous belt sanders tend to overheat the surface layers to the point where resistance cannot be fully restored even with subsequent pickling.

There are many types of quality ordinary steel sheets sold in the market, and the thickness of quality ordinary steel sheets also has some specifications.   What are the thickness specifications of quality ordinary steel sheets?According to the thickness of quality ordinary steel sheets, the thickness of the sheet is between 0.14 mm and 0.5 mm, while the width is between 650 mm and 1100 mm.   These ETP Tinplate are usually used in food cans, general chemical cans and aerosol cans. Welcome inquiry.

16th,Jan 2022 our company held the 2022 annual staff commendation conference, Congratulations to Wuxi Talat steel Co.ltd for achieving brilliant performance in 2022 with annual sales exceeding 10,000 tons pipes. Our 34CrMo4 alloy pipe is a chromium-molybdenum alloy steel. Its composition (approximately 0.34% C, 1% Cr, 0.2% Mo) endows it with the following key properties: High strength and good toughness: A combination of high strength and good toughness can be achieved through quenching and tempering (quenching + high-temperature tempering). Excellent heat resistance: The addition of molybdenum significantly improves the steel's high-temperature strength and creep resistance, allowing for long-term operation at relatively high temperatures (typically -40°C to +500°C, depending on the operating pressure). Good fatigue strength: Suitable for components subjected to alternating loads. Decent corrosion resistance: Chromium provides basic resistance to atmospheric and weak media corrosion, superior to ordinary carbon steel. Good weldability and machinability: Appropriate preheating and post-heating measures are required. Main Applications Based on the above properties, 34CrMo4 seamless steel pipes are mainly used in the following fields: 1. Petrochemical and Energy Industries (Most Typical Applications) High-Pressure Pipelines and Manifolds: Used in drilling equipment, wellheads, and fracturing equipment for transporting high-pressure oil, gas, and water. Heat Exchangers and Boiler Tubes: Used in the manufacture of high-temperature and high-pressure heat exchange tubes and superheater tubes in petrochemical plants and power plant boilers. Hydrogenation Reactors and Supporting Pipelines: Selected due to its resistance to high temperature and pressure and its resistance to hydrogen corrosion. 2. Machinery Manufacturing and Heavy Equipment Hydraulic Supports and Cylinders: Used in mining hydraulic supports and hydraulic cylinders for engineering machinery (such as excavators and cranes), requiring high strength and pressure resistance. Drive Shafts and Drive Shafts: Used as drive shaft tubes in heavy vehicles, ships, and wind power generation equipment, bearing torque and bending stress. Rollers and Bearing Sleeves: Used for rollers and bearing components in papermaking machinery and steel rolling equipment. 3. Automotive and Aerospace High-performance chassis and roll cages: Used in racing and special vehicles to manufacture structural components requiring high strength and lightweight. Landing gear components and engine mounts: Used in the aerospace field to manufacture certain load-bearing structural components (usually with more stringent aerospace-grade material standards).

Problems and Solutions in the Application of Tinplate 1. Corrosion and RustProblem Manifestations: Localized Corrosion (Pit Corrosion, Crevice Corrosion): The base iron is exposed at points where the tin plating is damaged, leading to electrochemical corrosion in humid or electrolyte environments. Overall Rust: High humidity in the storage or use environment causes oxidation of the tin plating or rusting of the base iron. Content Corrosion: Acidic or sulfur-containing foods (such as tomato sauce, meat) may corrode the tin plating, leading to tin dissolution or sulfide spots. Solutions: Optimize Plating Process: Increase the thickness of the tin plating or use differential tin plating (thicker inner layer, thinner outer layer) to improve corrosion resistance. Inner Wall Coating Protection: For corrosive contents, apply an organic coating (such as epoxy phenolic resin, acrylic resin) to the inner wall. Environmental Control: Keep the storage environment dry (relative humidity ≤60%) and avoid excessive temperature differences that may cause condensation. Alloy Layer Treatment: Form a dense FeSn₂ alloy layer through a remelting process to enhance corrosion resistance. 2. Welding Difficulties and Poor Weld Quality Problem Manifestations: Melting of the tin layer during welding leads to electrode contamination, resulting in weak solder joints or missed welds. The weld seam is prone to rusting or leakage. Solutions: Use high-frequency resistance welding (TFS chrome-plated iron is more suitable): Chrome-plated iron has better weldability than tinplate. Laser welding or TIG welding: Use more precise welding processes for high-requirement products (such as chemical tanks). Weld seam repair coating: Apply a repair coating to the inner wall weld seam after welding to prevent corrosion.

How we solved the defects of a beverage company's tinplate cans - Our Success Story         In 2023, a US juice manufacturer had a 12% defect rate for its 250 ml cans - tiny seam leaks caused the cans to be damaged during transportation. Its original tinplate supplier blamed it on "processing errors", but internal testing confirmed that the material was the root cause: 1. Inconsistent thickness (0.20-0.23 mm, while the order thickness was 0.19 mm). 2. Weak tin plating (1.1/1.1 g/m2 peeling at the seams). 3. Rust spots after pasteurization.        The customer needed to find a solution within 8 weeks of the peak season.        Our factory team simulated a 120°C pasteurization cycle on samples from its original supplier and then readjusted the material - using 0.19 mm DR-8M CA tinplate to enhance seam strength. In addition, 2.8/2.8 g/m2 of tin plating was used instead of the original 1.1/1.1 g/m2 (the inner coating is thicker and more acid-resistant).        In the end, the customer produced 50,000 test cans at a speed of 1,800 cans per minute, and its defect rate dropped from the original 12% to 0.3%.        The customer's "crisis" was successfully resolved, and we received the customer's recognition and trust. In the subsequent cooperation, the customer gradually strengthened the cooperation with us, and the order volume is also increasing year by year!