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Published 17 February 2024
What the different for cold rolled and hot rolled
Hot rolled and cold rolled are both processes for forming steel plates or profiles, and they have a great impact on the structure and properties of steel. The rolling of steel is mainly hot rolling, while cold rolling is usually only used to produce steel products with precise dimensions such as small steel sections and thin plates. Hot rolled By definition, steel ingots or billets are difficult to deform and process at room temperature. They are generally heated to 1100 to 1250°C for rolling. This rolling process is called hot rolling. The termination temperature of hot rolling is generally 800 to 900°C, and is generally cooled in the air afterwards, so the hot rolling state is equivalent to normalizing treatment. Most steel products are rolled using hot rolling methods. Steel delivered in a hot-rolled state has a layer of iron oxide scale formed on its surface due to the high temperature, so it has a certain degree of corrosion resistance and can be stored in the open air. However, this layer of iron oxide scale also makes the surface of hot-rolled steel rough and the dimensions fluctuate greatly. Therefore, steel with smooth surface, precise dimensions and good mechanical properties must...
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Published 01 February 2024
Performance feature of 3CR12 and application introduction of 3CR12 stainless steel
European standard EN1.4003 China GB T 3280-2007: 00Cr12 Taigang T4003 3CR12 is a new type of weldable low-carbon ferritic stainless steel developed by the Columbus Plant in South Africa in the 1980s. The main feature of the product is to ensure a certain degree of wear resistance under humid environmental conditions. The welding performance of thicker products is improved, but the surface finish and color processing are difficult. Due to the rich mineral resources in South Africa, this steel type is very suitable for underground hot and humid environments. It is used to make funnels and chains for mines and mine equipment. This product is used to make power transmission and transformation towers in coastal areas. The service life can be extended to more than 20 years. It can also be made. Structural parts of the bridge, but the surface is preferably painted. 3CR12 is often used to replace coated carbon steel, weathering steel and aluminum. Offers the advantages of ferritic stainless steel such as strength, corrosion and wear resistance, weldable, formable, very durable, allowing for lower maintenance. The initial application field of 3CR12 stainless steel was in the corrosion/friction environment and was limited to the processing and manufacturing of...
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Published 26 January 2024
Stainless steel tube blank preparetion process
Defects caused by smelting, ingot casting and other factors not only cannot be completely eliminated during the rolling process and remain on the tube blank, but also new defects will be generated during the rolling process. Therefore, it is impossible to completely avoid tube blank defects. possible. Therefore, the tube blanks must be strictly inspected and surface defects must be thoroughly cleaned, which is an important measure to ensure the quality of steel pipes and improve the yield rate. Pipe rolling mills with better steel pipe quality at home and abroad attach great importance to this work. Normally, tube blank inspection and surface defect cleaning should be completed at the tube blank production plant, and the tube rolling plant will conduct re-inspection according to the corresponding tube blank technical conditions. The cleaning method of the tube blank is the same as that of other steel materials. It needs to be comprehensively considered based on cleaning efficiency, cost, quality, metal loss and the properties of the tube blank itself. In order to expose the surface defects of the tube and facilitate inspection, pickling, peeling and other methods are usually used to remove the oxide scale on the surface of the tube...
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Published 22 January 2024
Stainless steel price is higher than in December,2023 And will until after Chinese Lunar New Year
Since January, due to the impact of macroeconomics, the overall performance of the futures market has been strong. As of January 19, the high point of the main stainless steel futures contract has risen to 14,235 yuan/ton, which is an increase of more than 700 yuan/ton from the low in December. The overall market performance is strong. , which formed a certain support for market confidence and spot prices, and spot prices were also relatively strong. Although some companies have been on holiday since mid-January, steel mills have reduced production due to maintenance and supply has shrunk. Market pressure has been alleviated to a certain extent. There was no obvious inventory buildup in January, which has provided certain support for prices. It can be seen from the figure that from 2023 to the beginning of 2024, the social inventory building speed has dropped significantly compared with the beginning of 2023. As of January 18, 2024, the total inventory of Wuxi stainless steel in 50 warehouses was 522,500 tons, a week-on-week decrease of 0.11%. The inventory of 200 series in Wuxi market is 54,200 tons, a week-on-week decrease of 2.52%. Among them, 200 series cold rolling decreased by 0.23% week on...
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