low middle high carbon steel

According to the difference of carbon content in steel, it can be divided into low carbon steel, medium carbon steel and high carbon steel. Different carbon content can be achieved by adding recarburizer to achieve the desired effect.

Low-carbon steel is also called mild steel. The carbon content is from 0.10% to 0.30%. Low-carbon steel is easy to accept various processing such as forging, welding and cutting. It is often used to make chains, rivets, bolts, shafts, etc，it is called mild steel because of its low strength and low hardness,it includes most ordinary carbon structural steels and some high-quality carbon structural steels, most of which are used for engineering structural parts without heat treatment, and some are used for mechanical parts that require wear resistance through carbon and other heat treatments. The annealed structure of low carbon steel is ferrite and a small amount of pearlite, which has low strength and hardness, and good plasticity and toughness. Therefore, it has good cold formability and can be cold formed by methods such as crimping, bending, and stamping. This kind of steel fin has good weldability. Low carbon steel with very low carbon content has low hardness and poor machinability. Quenching treatment can improve its machinability.

Medium carbon steel is the carbon steel with a carbon content of 0.25% to 0.60%. There are a variety of products such as killed steel, semi-killed steel, and boiling steel. In addition to carbon, it can also contain a small amount of manganese (0.70% to 1.20%). According to product quality, it is divided into ordinary carbon structural steel and high-quality carbon structural steel, it is with good thermal processing and cutting performance, but poor welding performance, strength and hardness are higher than low carbon steel, while plasticity and toughness are lower than low carbon steel, good performance of hot-rolled and cold-drawn materials make it can be used directly without heat treatment or after heat treatment. The quenched and tempered medium carbon steel has good comprehensive mechanical properties.

High carbon steel is often called tool steel, with carbon content ranging from 0.60% to 1.70%, which can be hardened and tempered. Hammers, crowbars, etc. are made of steel with a carbon content of 0.75%; cutting tools such as drills, taps, and reamers are made of steel with a carbon content of 0.90% to 1.00%.High carbon steel has poor welding performance due to its high carbon content. The welding has the following characteristics: (1) Poor thermal conductivity, there is a significant temperature difference between the welded area and the unheated part. When the molten pool is rapidly cooled, the internal stress caused in the weld will easily form cracks. (2) It is more sensitive to quenching, and the martensite structure is easily formed in the near seam area. Due to the effect of tissue stress, cold cracks are generated in the near seam area. (3) Due to the influence of high welding temperature, the grains grow up quickly, and carbides are easy to accumulate and grow on the grain boundaries, which makes the weld fragile and reduces the strength of the welded joint. (4) High carbon steel is more prone to hot cracks than medium carbon steel when welding.

If you are in different content of carbon steel, and need high quality recarburizer, Anyang Huatuo Metallurgy can provide the help, which have supply the CPC,GPC,GC,CAC etc various recarburizer for more than 10 years, so if any required ,welcome for your consult.