China National Heavy Machinery Corporation was granted an invention patent: “A method for controlling hydrogen content in the production of large-scale cast steel components””

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China National Heavy Machinery Corporation has been granted an invention patent: “A method for controlling hydrogen content in the production of large-scale cast steel parts”. According to news from Securities Star dated November 13, 2025, data from the Tianyancha app shows that China National Heavy Machinery Corporation (601106) has received a new invention patent titled “A method for controlling hydrogen content in the production of large-scale cast steel parts”. The patent application number is CN202310783482.1, and it was granted on November 11, 2025. Patent Abstract: The present invention relates to a method for controlling hydrogen content in the production of large cast steel parts, and belongs to the field of casting technology. Including: manufacturing molds, preparing molding sand ； Shape ； Core making ； Use paint to spray the sand cores and cavities of cast steel parts, dry them with flame, apply the paint to the exposed surfaces of the cast steel parts, and then ignite it ； core assembly ； melting ； Hot air is blown into the cavity of the cast steel part through the gate, and the hot air is removed 20–30 minutes before pouring ； 15–20 minutes before pouring, argon is blown into the mold cavity through the sprue cup ； Once argon blowing is complete, move the ladle to align it with the pouring cup. Place an argon protection ring above the pouring cup; a steel tube is installed on this protection ring. A paper cap holder and an aluminum cap are placed above it. Argon is introduced 10–30 seconds before pouring, then the ladle is lowered for pouring ； After pouring is complete, a covering agent is poured into the Ming riser ； Use gas cutting or mechanical processing to remove risers and excess material ； Dehydrogenation heat treatment and performance heat treatment are carried out to obtain the cast steel part. The cast steel parts produced by the method of this invention have a low hydrogen content. Since the beginning of this year, China has obtained 90 new patent approvals, a 3.23% decrease compared to the same period last year. Based on the company’s financial figures for the first half of 2025, the company invested 156 million yuan in research and development during this period, a 19.28% increase compared to the previous year. According to big data analysis by Tianyancha, China National First Heavy Machinery Corporation has made investments in 33 companies in total and participated in 3,610 bidding projects ； Regarding property-related clues, there are 8 trademark records, 2,154 patent records, and 2 copyright records ； In addition, the company holds 338 administrative licenses.