In late January, during the National Symposium on the Management of Storage, Sales, and Use of Chlorofluorocarbons (CFCs) in Luzhou, Zhejiang Province, concerns were raised about the covert use of CFCs in refrigeration systems by some companies. Delegates at the event urged national authorities to enhance oversight of CFC storage, sales, and usage to ensure proper management after production has been phased out.
CFCs have long played a critical role in various industries, including refrigeration, air conditioning, cleaning, and aerosol manufacturing. However, their harmful impact on the ozone layer led to their classification as ozone-depleting substances, prompting global efforts to phase them out. Under the Montreal Protocol, China committed to accelerating the elimination of CFCs. In June 2007, the State Environmental Protection Administration signed a production phase-out agreement with six major CFC manufacturers in Jiangsu Province, marking a significant step toward compliance.
As of July 1, 2007, all CFC production except for one line at Zhejiang Suihua Fluorine Chemical Co., Ltd. was halted. This company is allowed to produce 550 tons annually for pharmaceutical aerosol use over two years, ahead of the scheduled deadline. By this time, China had successfully eliminated approximately 100,000 tons of CFCs, accounting for around 90% of its total production.
Despite these achievements, challenges remain. Some companies have been found using CFC-11 in disguised ways, disrupting the production of F141b, an approved alternative. The State Administration of Environmental Protection has since issued a draft plan to regulate HCFC storage, sales, and usage, aiming to support legal consumption in refrigeration and pharmaceutical sectors from 2008 to 2010.
Experts emphasize that effective CFC management requires coordinated efforts from government agencies, industry groups, businesses, and consumers. To meet future needs, the state has stockpiled 500 tons of CFC-11 and 3,000 tons of CFC-12 between 2006 and 2007. Zhejiang Suihua Fluorine Chemical Co., Ltd. adhered strictly to quotas, producing 333 tons of CFC-11 and 2,067 tons of CFC-12 last year.
Looking ahead, continued vigilance and improved regulations are essential to ensure full compliance with international commitments and protect the ozone layer effectively.
Ship Building Steel Plate
Marine Steel Plate refer to the steel used to manufacture the hull structure of sea-going ships and inland watercrafts, usually high-quality carbon steel and high-quality low-alloy steel. Marine steel plate is required to have certain strength, toughness, and low temperature resistance and corrosion resistance, as well as good welding performance.
General strength hull structure steel is divided into 4 grades: A, B, D, E. The yield strength (not less than 235N/mm^2) and tensile strength (400~520N/mm^2) of these 4 grades of steel The same, but the impact energy is different at different temperatures.
High-strength hull structure steel is divided into strength grades according to its minimum yield strength, and each strength grade is divided into A, D, E, F 4 grades according to its impact toughness.
Due to the harsh working environment of the ship, the hull of the hull is subject to seawater chemical corrosion, electrochemical corrosion, marine organisms, and microbial corrosion; the hull bears greater wind and wave impact and alternating loads; the shape of the ship makes the processing method complicated, so it is not Shipboard steel plates have strict requirements. First of all, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, welding performance, processing and forming performance and surface quality are required.
High strength shipbuilding steel grades include AH, DH, EH, and FH with a specified minimum yield point of 46 ksi [315MPa], 51 ksi [350MPa], or 57 ksi [390MPa].
Grades AH32, DH32, EH32 and FH32's yield strength is not less than 315MPa, and the tensile strength is 440~570Mpa. Grades AH36, DH36, EH36 and FH36's yield strength is not less than 355MPa, and the tensile strength is 490~620MPa. Meanwhile, the yield strength of AH40, DH40, EH40 and FH40 is not less than 390MPa, and the tensile strength is 510~660MPa.
Marine Grade Steel Plate,Shipbuilding Steel Plate,Marine steel sheet,marine cover plate
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