A kind of 20crmnti gear steel rolling production process
A production process and gear steel technology, applied in the field of 20CrMnTi gear steel rolling production process, can solve the problems of brittle cracks, hard spots, production cost waste, etc., and achieve the effect of uniform distribution, small inclusions and suitable structure
Inactive Publication Date: 2015-09-16
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology
In order to expand production and save energy consumption, many gear manufacturers currently use 20CrMnTi steel for mechanical processing without subsequent heat treatment and other processes, resulting in frequent processing problems such as brittle cracks and hard spots in the manufacturing process, and resulting in increased production costs. waste
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[0011] The 20CrMnTi round steel material prepared by the present invention has a mass percentage of its chemical composition: C0.17~0.23; Si 0.17~0.37; Mn 0.80~1.10; Cr 1.00~1.30; Ti 0.04~0.10; P≤0.025; S ≤0.020; Al 0.02~0.05; the rest is Fe, the total mass fraction is 100%. Chromium and manganese in this material are the main elements added to 20CrMnTi steel, which can improve the strength of the matrix and increase the hardenability. The addition of titanium refines the grains in the steel, prevents the grains from growing during carburizing, and improves the strength and toughness of the steel.
[0012] Before carrying out the rolling production of the 20CrMnTi round steel material, first carry out steelmaking production.
[0013] The steelmaking production process is: molten iron pretreatment→converter smelting→LF refining→VD degassing→continuous casting.
[0014] Among them, converter smelting uses desulfurized molten iron, deoxidation alloying of silicon manganese and ...
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The invention discloses a rolling production process of 20CrMnTi gear steel, which comprises the following steps: heating a round steel billet: placing the round steel billet into a heating furnace to heat, wherein a preheating stage, a first heating stage, a second heating stage, and an average heating stage are sequentially implemented on the round steel billet, the temperature of the preheating stage is less or equal to 850 DEG C, the temperature of the first heating stage is 1200-1260 DEG C, the temperature of the second heating stage is 1200-1280 DEG C, and the temperature of the average heating stage is 1150-1250 DEG C; carrying out phosphorus removal on the round steel billet: carrying out phosphorus removal on the round steel billet to remove oxide scales by using high-pressure water; cogging and rolling: carrying out cogging and rolling on the round steel billet subjected to phosphorus removal so as to obtain a primary rolled billet; carrying out rolling by using a continuous rolling unit: putting the primary rolled billet into the continuous rolling unit to roll so as to obtain rolled steel; and cooling the rolled steel: after cutting the rolled steel, cooling the rolled steel on a slow cooling bed so as to obtain a finished product. According to the rolling production process disclosed by the invention, 20CrMnTi gear steel which is good in strength, plasticity and hardness can be produced.
Description
technical field [0001] The invention relates to the field of metallurgical materials, in particular to a rolling production process of 20CrMnTi gear steel. Background technique [0002] With the development of my country's automobile industry, the amount and variety of gear steel are also increasing, and the quality requirements for gear steel are also getting higher and higher. 20CrMnTi steel is the leading variety of gear steel in China, and it is widely used in my country for gears, shafts, pistons and various special parts of automobiles and aircrafts. However, 20CrMnTi steel contains more carbide-forming elements such as Cr and Mn. The "TiN" non-deformable inclusions produced during smelting are harder than the matrix, which affects the machining accuracy. It will form a source of fatigue during use and affect the fatigue life of the gear. At the same time, this material also has the disadvantages of unstable hardenability and large deformation, and is gradually being ...
Claims
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IPC IPC(8): B21H5/00
Inventor 薛虎东宋振东周彦李平郑瑞高明星智建国涛雅
Owner INNER MONGOLIA BAOTOU STEEL UNION