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Non polluting process for carburizing steel in a molten salt bath. EP0147011: 1985-07-03: A non-cyanide salt bath and process for carburization of ferrous metals and alloys. EP0421236: 1991-04-10: Process for the nitrocarburizing of steel pieces. EP0408168: 1991-01-16: Method of pretreating metallic works and method of nitriding steel ...
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worldwide state of low-temperature nitriding and carburizing of austenitic stainless steels (Ref 1, 8). In addition, several academic confer-ences have been held in the past two decades on the topic of low-temperature thermochemical surface treatments of stainless steels (Ref 9–13). On the commercial front, several entities adver-
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The process is called carburizing. As you are talking about making knifes I figure you want the home gamer version and aren't planning on spending thousands on an industrial carburizing furnace. Basically you need a source of carbon, generally tha...
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May 16, 2003· RE: Compatibility of Molten Sulphur and 304L SS. hacksaw (Mechanical) 29 Apr 03 11:22. typically carbon steel is the material of choice.surprised that external cracking is reported; most sulfur tanks are insulated. suspect that you are operating in a coastal environment and pulling in salt laden air during sulfur transfers.
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For the steel-making industry, the most suitable carbon additive is calcined petroleum coke with fixed carbon of 98.5%min. Sulfur in calcined petroleum coke is a crucial element, for sulfur impacts the quality of steel. The lower the sulfur, the better quality …
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Carbon Additive. Carbon Additive. There may be wide variation in the characteristics of recarburizers, depending on the grade of steel that is being prepared, and the other components being added. It is used to adjust the carbon content of the steel while it is still liquid before casting. Coal used / Benefits: Synthetic Graphite / very high ...
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Premelted calcium aluminates have been employed as synthetic steelmaking slag desulfurizers since around 1937 in France, when Rene Perrin utilized a separate furnace to provide a molten addition of 50% calcium oxide and 50% aluminum oxide to a ladle of molten deoxidized steel which achieved an 80% drop in sulfur from 0.025% to 0.005% during ...
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The main raw material is Ningxia unique high quality anthracite, with characteristic of low ash and low sulfur. Carbon additive has two main uses, namely as the fuel and additive. When being used as the carbon additive of steel-smelting, and casting, the fixed carbon may achieve above 95%.
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Alloy Steel. Steels that contain specified amounts of alloying elements — other than carbon and the commonly accepted amounts of manganese, copper, silicon, sulfur, and phosphorus — are known as alloy steels. Alloying elements are added to change mechanical or physical properties. A steel is considered to be an alloy when the maximum of the ...
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Carbon Raiser. The requirements for recarburizers for top-blown converter steelmaking are: 1. The fixed carbon is higher. 2. The content of ash, volatile matter and impurities such as sulfur, phosphorus, nitrogen should be low. 3. Dry, clean, and moderate particle size.
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A method of making ultra-low carbon, ultra-low sulfur content steel comprising introducing molten metal and slag into a vacuum decarburizer to reduce the carbon content of the metal to below 0.005%, followed by deoxidizing the molten steel, deoxidizing the slag and mixing the slag with the molten steel to reduce the sulfur content to below 0.005%.
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8 2.2.1 Theory of carburizing Carburizing is usually done at an elevated temperature with a chemical agent such as solid or molten salt, gaseous medium, which can supply an adequate. ... Lainnya. Carburizing Effect On Impact Toughness Of Low Carbon Steel. #Effect Of Martempering Process On Plain Carbon Steel. 24 0 0
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Graphitization can reduce the content of impurities, increase the carbon content and reduce the sulfur content. Carburizing agent is widely used in steel-making, casting, smelting and other industries. The use of carburizing agent in casting can greatly increase the amount of scrap steel, reduce the amount of pig iron or no pig iron.
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High quality carburizing agent is essential to producing high quality steel auxiliary additives. Usage: For 1-5 T furnace: - while a small amount molten iron in the furnace, - or with some molten iron remained, add the carbon additive one-time, - then add the other material. which can make carbon additive …
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HEAT TREATING MOLTEN SALTS. AUSTEMPERING SALTS. HIGH SPEED STEEL SALTS. NEUTRAL SALTS RUBBER CURING SALTS. NU QUENCH 275 RCS is a high purity, eutectic mixture of nitrate and nitrite salts, formulated specifically for curing extruded rubber profiles at the lowest possible temperature ranges. It is used as a molten liquid salt bath and is ...
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Apr 29, 2010· 31. Removes the risk of hot shortness and hot cracking when the ratio of manganese to sulfur is greater than 20:1 by forming a higher melting-point eutectic with sulfur than iron sulphide 32. Has a major influence on the anisotropy of toughness in wrought steels due to the ability to deform manganese sulfides during hot working 33.
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Aug 06, 2019· Common Steel Alloying Agents. Below is a list of commonly used alloying elements and their impact on steel (standard content in parentheses): Aluminum (0.95-1.30%): A deoxidizer. Used to limit the growth of austenite grains. Boron (0.001-0.003%): A hardenability agent that improves deformability and machinability.
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90-150MM FOUNDRY COKE FOR STEEL FACTORY,LOW ASH, LOW SULPHER . Product Name: Foundry Coke. Description: Foundry Coke is the main fuel of melting iron in the oven. have the characteristics of big block, low re-activity, small porocity, enough anti-crush strength, low ash and low sulfur.
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Graphitized Petroleum Coke GPC GPC Steel making Carbon additive Low S and N good quality black. $380.00 - $990.00 / Metric Ton. The Factory Supply Competitive Price of Calcined Anthracite Coal Carburizing Agent. $400.00 - $900.00 / Metric Ton. GD-GCA-01 /Carbon Additive…
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Ad. Low Sulphur Calcined Anthracite Advantage and competitive of caclined anthracite: 1. strong supply capability 2. fast transportation 3. lower and reasonable price for your reference 4. low sulphur, low ash 5. fixed carbon:95% -90% 6. sulphur:lower than 0.3% Application : Carbon additive has two main uses, namely as the fuel and additive Used in steel mill ladles, melting, holding and blast ...
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Manganese in Steel The element sulfur is present in all steels as an impurity element, as illustrated in Table 6.2. There are two unique facts about sulfur in iron that lead to a potential for sulfur impurities causing embrittlement of steel when present at even extremely low concentrations: (1) The solu-
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Ferritic nitrocarburizing or FNC, also known by the proprietary names Tenifer, Tufftride and Melonite as well as ARCOR, is a range of proprietary case hardening processes that diffuse nitrogen and carbon into ferrous metals at sub-critical temperatures during a salt bath. Other methods of ferric nitrocarburizing include gaseous process such as Nitrotec and ion (plasma) ones.
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Carburizing process is carried out to improve the power quality of a low carbon steel with a low cost. The material used is a type of low carbon steel with a carbon value of 0.25%. Carburizing process on low carbon steel at a temperature of 900 0C with a holding time of 90 minutes using goat bone and coconut shell char medial.
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An additive composition for use in steel making, which comprises 84.8-99.3 % by weight of an oxide component; 0.5-1.6 % by weight of a metal component; and 0.04-0.07 % by weight of a rare-earth element component, is used in such a way that its four aliquots are each added in blast furnace. The amount of the composition to be added is dependent on the steel to be produced.
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Steelmaking has played a crucial role in the development of ancient, medieval, and modern technological societies. Early processes of steel making were made during the classical era in Ancient Iran, Ancient China, India, and Rome.. Cast iron is a hard, brittle material that is difficult to work, whereas steel is malleable, relatively easily formed and a versatile material.
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Smelter coke oven, high carbon steel method, petroleum coke as impurity less carburizer selection. The regulations of carburizing agent for top blown converter steelmaking are as follows: fixed a fixed high carbon content, low ash, volatile, sulfur, phosphorus, nitrogen and other impurities, particle size data distribution, dry, clean, moderate
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Buy these low sulfur carbon additive carburizing at Alibaba.com for their exceptional performance in many fields. These low sulfur carbon additive carburizing are …
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Sep 16, 2016· As shown in Figure 4, for a 10-second cooling, a low-carbon steel (0.2%C) produces ferrite, then pearlite and Bainite, while a high-carbon steel (0.7%C) produces martensite only. Figure 5 The result of the carburizing has been used as an input for the quenching simulation with heat transfer coefficients (HTC) corresponding to the typical oil ...
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50Hz, silica lining). Metallic charge included molten iron heel (17-50%) and steel scrap (50-83%). Each recarburizer was added as 4…6 parts (25-30 Kg) in the steel scrap charge. Finally, the 15min holding time was applied (Table 3). Results and Discussion The results of the carbon and sulphur dissolution studies are presented
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recarburizer. Recarburizer, also know as carbon additive, carbon raiser. It is a product for increasing the carbon element (C). During the steel making process, various factors may cause the carbon content in the molten steel to decrease. This will affect the quality of the finished steel. So, steel mills usually purchase carbon reductants to ...
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Apr 20, 2016· Per definition, carburizing material is usually low-carbon steel, normally with a carbon content of ≤ 0.25 wt.%. In the past, plain carbon steels, such as SAE 1020, were used; however, with the demand of carrying a heavier load, more alloy steels have been developed and carburized, such as SAE 4320, 8620, and 9310 and 17CrNiMo6/18CrNiMo7-6 ...
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Nov 15, 2002· Advances in Thermal Management with Additive Metals ... alloys with low sulfur ... is likely to have poorer wear resistance than the carbon-rich case of a carburized steel …
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After years of research and development in Qingdao and combined with customer experience in the production of carburizing agent, with high carbon, low sulfur, low nitrogen, less harmful impurities and other excellent characteristics, the product is a new material for improving the process and quality of Molten Steel in steel-making industry.
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Dec 26, 2013· Carbon additives has added the structures of high carbon, Low sulphur petroleum coke, low nitrogen and dangerous layers, Carbon Raiser can be used in the steel manufacture for endorse the steel excellence in steel-melting, now this creation is broadly used in foundry plant life,handbrake pads and rub substantial produce possibilities.. Carbon Manufacturer retails fine and likes a respectable ...
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This is a new type of high-efficiency alloy material,which is made of high-purity carbon powder,metal silicon powder and low sulfur and low nitrogen carbon material by special processing technology.The product has high density,high purity,no pollution to liquid steel,high recovery rate and stable effect,So it can replace part of 70/72 ...
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Jun 09, 2016· Steelmaking using carburizing agent and cast iron using carburizing agent, and some other materials are also useful for adding to the carburizing agent, such as brake pads with additive, friction material.Recarburizer belongs to external steel and iron carbon materials. High quality carburizing agent additive is essential for production of high quality steel.
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Jul 20, 2018· Vacuum degassing is a procedure that is used to improve the internal cleanliness of steel after the initial melt has occurred. The principle of the process is to reduce the atmospheric pressure above the liquid steel in the vacuum re-melt furnace. The air pressure over the molten steel is reduced to approximately 1mm of mercury (Hg).
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Other salts for carburizing and carbonitriding Product Application Working temp. in °C CECONSTANT® 80 One-salt system to achieve a surface carbon level 850 – 950 CECONSTANT® 110 of approx. 0.8 resp. 1.1 % C. CECONSTANT® 80 A Starter salts for the initial filling. CECONSTANT® 110 A GS 540 / C 3 This two-salt system is also suitable for carbonitriding 700 – 950
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