Classification of Carbon Steel

Classification of Carbon SteelA. Low-carbon steelsHas ≤ 0.30% Carbon. Generally supplied in the form of flat-rolled products (sheet or strip), the condition of cold-rolled and annealed condition. For high-formability steels, the carbon content of less than 0.10% with levels up to 0.40% manganesium, used for automobile body panels, tin plate, and wire products.For rolled steel structural plates and sections, the carbon content to 0.30% with manganesium levels up to 1.5%, is used for stampings, forgings, seamless tube, and boiler plate.
2. Medium-carbon steelsCarbon content of 0.30-0.60% with levels between 0.60-1.65% manganesium. If the carbon content to 0.5% and with the addition of levels manganesium the medium carbon steel can be used in the quenched condition and temper.Kegunaan of medium carbon steels manganesium include shafts, axles, gears, crankshafts, coupling, and forgings. Steel with carbon content, 0.60% 0:40 can also be used for rails, railway wheels and rail axles.
3. High-carbon steelsHas a carbon content of 0.60-1.00% and 0.30-0.90% unsure manganesium between. High-carbon steels have good wear resistance due to the high surface hardness. High-carbon steels used for spring materials and high-strength wires.
4. Ultrahigh-carbon steelsAre still being studied, generally has a carbon content of 1.25-2.0% C. These steels are processed to produce thermomechanical micro structure is very smooth and rounded with granulated size discontinuous proeutectoid carbide particles.Standard organization
• AISI, American Iron Steel Institute• SAE, the Society for Automotive Engineering• UNS (Unified Numbering System)• ASTM, American Standard for Testing and Materials• JIS, Japanese Industrial Standard• DIN, Deutsches Institut fur Normung• ASME (American Society of Mechanical Engineers)• CEN, European Committee de normalization• ISO, International Standardization Organization• NF, Association française de normalization (AFNOR) JIS• Grouped on the basis of chemical composition (AISI,SAE, UNS)• grouped on the basis of production applications, andgrade (qualified for the particular application) (ASTM,JIS, DIN).- For example:• Chromium steel for heat resistant applications• Tubing for general application• Structural steel• Cast iron for the automotive


AISI STANDARDAISI (American Iron and Steel Institute)SAE (Society of Automotive Engineers)Represented by 4 or 5 digits:A. The first digit indicates the type of steel.eg: 1 = carbon steel; 2 = nickel steel; 3 = nickel chromium steel2. The second figure shows:a. Levels for alloy steel alloying elements is simple.eg AISI 25xx = steel nickel with 5% nickelb. Modification of alloy steel to a complex alloy steels.eg molybdenum steel AISI 40xx =; AISI 41xx = chrom-molybdenum steel3. Two or three digit last number indicates the carbon content percent percent.for example: = steel AISI 4340 chrome-molybdenum-nickel with 0.40% C4. If there is a letter then the letter in front of the figure shows the process of makingsteel.for example: B = Acid Bessemer carbon steel C = Basic opern-hearth carbon steelE = Basic electric furnace process.JIS STANDARDJIS standard developed by the Japanese Industrial Standards Committee, which is part of the ministry of industry and international trade in Tokyo.1.Diawali followed by the SS and the numbers indicate the minimum tensile strength inkg/mm2.Example of JIS SS 37 = Steel with a tensile strength ≥ 37 kg/mm22.Diawali with S and followed by numbers which indicate their chemical composition.Example of JIS S 35 C = 0.35% C steel with3. For the class of stainless steel of ASTM grade usually followed by a letter code that isSUS followed by a code number according to the SAE or AISI:Examples of Grade JIS G 4303:1998 Stainless steel SUS 304 = bars with grade SUS 304 (type or types of austenitic stainless steel)JIS (Japanese Industrial Standard) is one of several kinds of standardization in the world. JIS Japan itself issued by the state as a reference in the world of engineering. Standardization is used for adjustment of steel products to conform to the license, so that the steel products can be used safely. The use of steel, there are two things that usually do is use directly and use the product after the product is given special treatment. Whether or not special treatment performed depends on the properties of castings and their use. It is necessary to know in depth about the properties of these steels. The treatment here is the treatment of metal workpieces to facilitate work on a process, and to give specific properties and processes that allow one to obtain the desired properties of the heat treatment process.One of the references contained in the JIS namely the heat treatment of steel castings in low alloy steel SCMnCr 2 before it is used. In addition, to give certain properties to the metal before the product is ready for use. In this case I do research through the process of quenching and tempering to determine its effect on hardness (hardness) and tensile strength (tensile strength).




Based Strukturmikro


Based on the microstructure:• Steel Hypoeutectoid (% C <0.8)• Steel Eutectoid (% C = 0.8)• Steel Hypereutectoid (0.8 <% C <2%)Ferrite: soft and ductilePerlite: toughCementit: strong, hard and brittle


 Baja Hypoeutectoid