I. Current Status of the Stainless Steel Industry Currently, stainless steel has become an indispensable material in modern industry, with applications spanning construction, petroleum, chemical, food, aviation, and medical fields. With the development of society, economy, and technology, the application of stainless steel is becoming increasingly widespread. In 2019, global stainless steel production exceeded 50 million tons, with China's production exceeding 29 million tons, accounting for nearly 60% of global stainless steel production, making it the world's largest stainless steel producer. However, the stainless steel industry also faces some problems, such as market supply and demand imbalances, imperfect industry standards, low technological levels, and inconsistent product standards. These problems constrain the industry's development, requiring close cooperation between upstream and downstream sectors of the industrial chain, and the adoption of effective strategies and methods to steadily move forward. II. Future Trends of the Stainless Steel Industry In the future, the stainless steel market will continue to expand, exhibiting the following trends: 1. High-end…

I. Definition and Types of Tolerance Tolerance refers to the maximum allowable deviation range of a part, and is one of the indicators for measuring the precision requirements of a part. Although stainless steel has excellent corrosion resistance, some deviations can still occur during processing, therefore tolerance control is crucial. Common tolerance types include ordinary tolerance, limiting tolerance, basic tolerance, and grade tolerance. Ordinary tolerance refers to tolerance without specific specifications, limiting tolerance refers to tolerance with some specifications, basic tolerance refers to the tolerance limit for achieving a certain precision grade, and grade tolerance refers to tolerance specified according to grade standards. II. Calculation Formulas for Tolerance The calculation formulas for tolerance vary depending on the type of tolerance. Here are some commonly used tolerance calculation formulas: 1. Ordinary Tolerance: Tolerance value = Upper tolerance - Lower tolerance 2. Limiting Tolerance: Tolerance value = Maximum limit - Minimum limit 3. Basic Tolerance: Basic tolerance = Maximum…

I. What is Precision Casting of Stainless Steel? When producing stainless steel products, some products have unusual shapes that cannot be produced using processes like pipe bending. To produce these irregularly shaped products (hollow or solid inside), a process is used: wax mold → sand mold → liquid material filling and molding. Advantages: A variety of styles can be created based on different wax molds. Disadvantages: The precision of the molded blank is not high, and the surface roughness is relatively large. II. Precision Casting Process Flow 1. Make molds according to different product shapes. Molds are divided into upper and lower concave molds, completed through a combination of processes such as turning, planing, milling, etching, and EDM. The shape and size of the concave mold are consistent with half of the product. Because wax molds are mainly used for industrial wax pressing, aluminum alloy materials with low melting point, low hardness, low requirements, low price, and light weight are selected for the molds. 2. Use aluminum alloy molds to produce a large number of solid industrial wax models. Under normal circumstances, an industrial…

Impurities are crucial elements affecting the purity and transparency of the oxide film on stainless steel precision castings. Its thickness, porosity, purity, and sealing quality directly interfere with the mirror finish of the casting. For example, a higher impurity content in the oxide film reduces purity and decreases the transparency of the casting. To ensure a mirror finish on stainless steel precision castings, the impurity content in the oxide film must be reduced. Therefore, the thickness, porosity, purity, and sealing quality of the film must be carefully controlled to minimize impact on processing. Impurities in the oxide film of stainless steel precision castings primarily originate from the casting itself, with some coming from the oxidation bath. Therefore, appropriately reducing the content of alloying elements in the casting can minimize impurity levels. Stainless steel precision casting is a low- or no-cutting casting process, a superior technology in the casting industry with wide applications, suitable not only for casting various types and alloys. ...

1. Precision castings are formed by pouring molten metal into a mold and then cooling it. There are many casting processes for precision castings, including metal mold casting, pressure casting, investment casting, lost foam casting, and V-process casting. Precision casting produces relatively precise finished products that require little or no further machining. It can also produce castings with complex shapes and thin thicknesses, easily handling both small and large parts. Currently, precision casting technology is developing rapidly worldwide and has a wide range of applications. 2. Ordinary casting, also known as forging casting, produces relatively rougher parts compared to precision castings. Die casting uses pressure casting. Under high pressure, molten metal is poured into a casting mold at a high speed. The pressure then causes it to solidify. Ordinary casting often uses multiple raw materials…

Casting is a widely applicable method for producing various precision steel castings, as well as castings of aluminum alloys, ferroalloys, and zinc alloys. For brittle alloys with poor plasticity, such as ordinary cast iron, casting is the only viable forming process. Cast steel parts possess a certain dimensional accuracy, generally exceeding that of ordinary forgings and welded parts. Furthermore, castings have low processing costs, good overall economic performance, and are superior to other metal forming methods in terms of energy and material consumption and production costs. However, cast steel has a high melting point, resulting in a correspondingly high pouring temperature. At high temperatures, the interaction between molten steel and the mold material easily leads to sand adhesion defects. Therefore, artificially produced quartz sand with high refractoriness should be used for the mold, and the mold surface should be coated with a coating made of quartz powder or zirconium sand powder. This is to significantly reduce gas sources and improve the fluidity of the molten steel…

The development of silica sol precision casting in China is relatively recent. The manufacturing process requires high precision, necessitating a deeper understanding of the process in both theory and practice, and continuous improvement of fundamental professional knowledge. Silica sol precision casting enriches practical experience, streamlining the entire precision casting production process and producing higher-quality products. During the filling process, the foam model needs to be liquefied and decomposed, generating many small-molecule gases and foam ash. These substances are harmful to humans to some extent. Operators must strictly follow the operating manual in daily work, both in actual operation and with auxiliary protective equipment. Proficiency in the operating procedures is essential. Silica sol precision casting…