It is reported that from December 1, 2009, Maanshan Iron and Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Sichuan Investment Great Wall Special Steel Co., Ltd., Anshan Iron and Steel Company, Benxi Iron and Steel Company drafted, the State Administration of Quality Supervision, Inspection and Quarantine, the State The newly revised "Waste Steel" national standard (GB4223-2004) issued by the Standardization Management Committee was officially implemented after approval. What will the new revised scrap steel national standard bring to the scrap steel market? The reporter interviewed some insiders who are engaged in scrap steel trade.
A marketing manager of a circulation enterprise that has been engaged in scrap steel recycling, processing and trade for a long time told reporters that the newly revised national standard for scrap steel will be promulgated and will play a certain role in further regulating the trading of scrap steel market. Its biggest effect will be It is reflected in three aspects. First, it is conducive to the socialization of scrap steel processing. Second, it is conducive to the finished product of scrap steel products. Third, it is conducive to environmental protection and clean production of steel mills. Because the newly revised national standard for scrap steel is compared with the original standard (GB/T4223-1996) established in 1996, the technical content has been revised. For example, the new standard cancels the definition and related content of recycled scrap in the original standard. The maximum size and maximum weight of scrap steel pieces; 4 terms in the original standard were abolished, 6 terms and definitions were added; the classification of scrap iron was changed, based on the chemical composition and outer dimensions of scrap iron. Divided scrap iron into 3 categories and 4 varieties; changed the classification of scrap steel, proposed new dimensions and single weight and corresponding acceptance conditions, and divided scrap into heavy scrap, medium scrap, small scrap, and uniform 5 types of scrap steel and light-duty scrap steel; the group of adjusted alloy scrap steel is merged and simplified into 6 steel grades and 46 steel groups by the original standard of 5 steels and 67 steel groups, and adjusted to an informative appendix; Reduce the content of S and P in scrap steel from 0.080% of the original standard to 0.050%; increase the requirements for classification of scrap steel; increase the requirements for environmental control, radioactive material control, etc., and increase inspection items.
These new contents stipulate and supplement, and put forward clear requirements for the recycling and processing of scrap steel, so that the processing of scrap steel is further developed in the direction of standardization and socialization; at the same time, the processed scrap steel is more finished. The scrap steel processed according to the new national standards for scrap steel is already a finished product for the steel mill, and can be directly smelted into the steelmaking furnace, and the steel mill no longer needs to be reworked. In the past, steel mills needed to be reclassified, processed, and inspected before scrap was put into the furnace to ensure the quality of scrap steel and the safety of smelting. In the past, a vicious accident involving a steelmaking furnace explosion due to scrap problems has occurred. If the implementation of the new standards is strictly enforced, such accidents may be eliminated in the future.
The insiders here also said that the revised national standard for scrap steel highlights environmental awareness, has clear requirements for environmental control of waste steel, control of radioactive materials, etc., and strengthens testing methods, increases inspection items and Part of the test method. These are conducive to environmental protection and are conducive to the clean production of steel mills. In addition, the industry believes that the implementation of the new national standards for scrap steel will further strengthen the quality management and standardization management of China's scrap steel industry, and will also be in line with international standards, so as to better utilize international scrap steel resources and play "two The effect of the market, two resources. Because the new standard is closer to the standards of Japan, the United States, Russia and other countries, it has taken a new step in the integration with the international community.
Some people in the industry have analyzed the problems that may arise in the implementation of the new standards. They believe that the new scrap steel standard regulates the processing of scrap steel, but increases the difficulty in recycling and processing scrap steel, and thus the market transaction of scrap steel. And scrap steel prices will change. China's scrap steel resources are very scarce. The annual gap is 15-20 million tons, and the annual import volume is about 10 million tons. Once the market is in serious demand, it is not allowed to self-study in accordance with the new standards. From the perspective of steel mills, the smelting equipment of different steel mills are different, and the differences are very large. Moreover, each steel mill has its own set of regulations on the standards and requirements of scrap steel, and has its own enterprise standards. This is because each steel mill is based on its own furnace size and equipment conditions to develop scrap steel standards that suit its production conditions. For example, in a 20-ton converter, the size of the scrap used is generally only 33 cm, while the 300-ton converter, which has a size of 1.2 m-1.5 m, can directly enter the furnace, and this scrap is not suitable for small converters. Moreover, for steel mills, they all have their own long-term scrap supply channels, and there are fixed scrap steel suppliers. After decades, they are used to the traditional standards, and the new standards can only be “referencedâ€. .
As for the integration of international scrap steel standards, China's new standards have indeed taken a new step, but there is still a certain distance. Foreign scrap standards are set higher, especially in environmental protection, which emphasizes the cleanliness of scrap and no pollution. For example, the scrap steel cleaning regulations in the US scrap steel standards: all grades of scrap steel must be free of dirt, no color metals or any foreign matter, and should not have excessive rust and corrosion. The first corner scrap is the first requirement for clean scrap. Any size shall not exceed 12 inches. Including new corner scraps in the factory (for example, sheet metal trimming and stamping scraps, etc.), excluding old cars and mudguards, plating, lining and enamel sheets and electrical steel scraps with a silicon content greater than 0.5% .
In short, the industry believes that the implementation of China's new scrap steel standards, although bringing new difficulties to scrap steel operation, will have a positive effect on regulating the scrap market and integrating with the international market, and will also promote domestic waste. The standard, orderly and healthy development of the steel market. I hope that in the implementation process, the steel mills and scrap steel trading enterprises will work together to cooperate with each other, work hard together, implement them earnestly, and further improve the new standards in practice.
Hexagon Flange Head Drilling Screw With Tapping Screw Thread
Hex flange self-drilling screw into sheet metal - with a drill - the advantage is the use without the need for pre-drilling and minimal risk of sheet deformation. Suitable for joining sheets where high joint strength is required.
A Hexagon Flange Head Drilling Screw with Tapping Screw Thread is a type of screw that features a hexagonal flange head and a tapping screw thread.
The hexagonal flange head refers to the shape of the screw head, which has six sides in the form of a hexagon. This design allows for easy gripping and tightening using a wrench or a socket.
The drilling screw thread is a type of thread that is designed to create its own hole as it is screwed into a material. This eliminates the need for pre-drilling a hole before inserting the screw.
The tapping screw thread refers to the type of thread that is designed to cut into the material it is screwed into, creating its own threads. This allows for a secure and tight fit between the screw and the material.
Overall, the Hexagon Flange Head Drilling Screw with Tapping Screw Thread is a versatile and efficient screw that combines the benefits of a flange head for easy installation and a drilling and tapping thread for creating its own hole and threads.
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