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Porosity and sand holes are common defects in castings, mainly caused by the following reasons: Molding sand quality issues: Insufficient permeability or excessive moisture content in the molding sand prevents gas from escaping smoothly during pouring, forming porosity. Improper pouring process: Poor pouring temperature or excessively fast pouring speed can lead to poor molten metal […]

Not necessarily. The surface effect after tungsten carbide spraying depends on various factors, including the surface treatment method and the application field. I. Overview of Tungsten Carbide Spraying Technology Tungsten carbide spraying is a commonly used surface coating technology, with tungsten carbide powder as its main raw material. Spraying tungsten carbide powder forms a thin

Castings are parts manufactured using casting processes. Due to the uncontrollable and complex nature of the manufacturing process, castings often contain defects to a certain extent. To ensure the quality of castings, it is necessary to assess the defects and classify them according to certain standards. Common casting defects include porosity, inclusions, looseness, cracks, and

Casings are prone to the following eight categories of typical defects during production, classified according to their causes and characteristics: Porosity Defects Porosity: Gas ​​fails to escape in time, forming smooth-walled circular/pear-shaped pores (divided into invasive, precipitating, and reactive types). Commonly found subsurface or internally, reducing density and fatigue strength. Shrinkage Cavities & Porosity: Caused

Tungsten carbide can typically withstand temperatures between 2000℃ and 2800℃, with the specific temperature depending on its manufacturing process and microstructure. Its long-term stable operating temperature is 550–650℃. It maintains high hardness even at high temperatures: at 800℃, the hardness retention rate is >85%, and it does not lose its protective ability due to high-temperature

Manganese steel and tungsten steel are two important metallic materials whose performance differences stem from their internal chemical composition and microstructure. Manganese steel is based on carbon steel, with the addition of manganese to form an austenitic structure. This structure allows for surface work hardening under impact, resulting in high wear resistance and toughness. Tungsten

Tungsten steel (hard alloy) is mainly characterized by its high density, extremely high hardness, extreme brittleness, weak magnetism or non-magnetism, and rust resistance. However, specific types may vary in their characteristics. Simple methods can be used for preliminary identification in daily life. How to Easily Identify: Weight: Significantly heavier for the same volume, with a

Ultra-high alloy powder metallurgy high-speed steel (e.g., S290/HOP7511): Hardness HRC 66–70, wear resistance close to tungsten steel, but with better toughness and crack resistance, suitable for heavy-duty cold-working dies and cutting difficult-to-machine materials. High-carbon, high-vanadium tool steel (e.g., PM23): Hardness HRC 64–66, wear resistance superior to ordinary high-speed steel, lower cost than tungsten steel, suitable

The precision level of lost-wax casting (investment casting) is relatively high among conventional casting processes. It allows for minimal or even no machining, significantly reducing subsequent machining workload. I. Dimensional Tolerance Accuracy The international standard follows ISO 8062, and the equivalent domestic standard is GB/T 6414. Its tolerance grades typically reach CT4-6, far exceeding the

Stainless steel and cast steel can be welded, but the following points should be noted to ensure weld quality and performance: Material Properties Analysis: Stainless Steel: Excellent corrosion resistance and heat resistance; common grades include 304 and 316. Cast Steel: Manufactured using casting processes, with a higher carbon content, making it prone to cracking during