At present, the annual output of steel casting has reached 11 million tons, and the molding sand mainly includes furan resin self-hardening sand, ester hardening alkali phenolic resin self-hardening sand and ester hardening water glass sand. Among them, 8 million tons of steel castings are made of water glass sand molding (core) process, and the rest are alkali phenolic aldehyde and furan resin sand and other processes. Because furan resin sand is used in steel casting production, it is prone to crack. Although the raw materials of water glass sand are cheap and the surface quality of the castings is good, but the knock-out performance is poor and the regeneration of the old sand is difficult, so it is difficult to meet the requirements of high quality, high precision and high performance required by the equipment such as large hydrogenerators and thermal generators. Many large and medium-sized steel casting enterprises in China have adopted new organic ester water glass sand and ester hardening alkali phenolic resin sand. With the continuous expansion of clean, energy-saving, lightweight, digital and intelligent concepts and continue to become the research and development focus of the cast steel industry, it is imperative to improve and upgrade the green casting equipment of low carbon emissions, energy saving and low pollution, and renewable recycling and sustainable development of cast steel.
The surface sand of large steel castings generally uses special sand such as chromite ore, and the price of these raw sand is much higher than that of silica sand. Therefore, the separation technology of chromite ore and quartz sand in the old sand recycling system is also a key technology. However, there are also pearl sand instead of zircon sand in the casting of steel core will be applied.
At present, ester hardening water glass self-hardening sand has been recognized as the most likely to achieve green casting steel production sand process. Its colorless, tasteless, non-toxic, in the sand mixing, modeling, casting and sand drop process without irritating odor and toxic gas production, no harm to the human body, as well as good casting performance and other characteristics, in the casting industry is generally recognized. But the only disadvantage is that it is difficult to regenerate, which will cause greater solid pollution. If the problems such as the regeneration of water glass sand can be solved, water glass sand casting will take the lead in entering the ranks of green casting, and the most key is to achieve the improvement and upgrading of casting equipment.
In the face of the future of China's high-end and large steel casting in the field of huge demand, foreign manufacturers are accelerating research and development, expand intelligent casting equipment production capacity to fight for the Chinese market share, domestic enterprises should seize the opportunity, take positive measures to meet the challenges in the competition.
Changshu Hongqiao Cast Steel Co., Ltd. mainly produces various specifications of carbon steel, high, middle and low alloy steel, stainless steel, heat-resistant steel, high manganese steel, high chromium cast iron. For petroleum, chemical industry, metallurgy, mining machinery, coal mining machinery, wind power, nuclear power, Marine and other industries to provide high-quality steel casting, and export abroad. Changshu Hongqiao cast steel Co., LTD. Custom cast steel Marine cast steel ABS Marine engineering service Cast steel for BOP cast steel production