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Low-carbon boron-added steel for inhibiting precipitation of tertiary cementite of strip steel along grain boundary
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A technology of carbon-boron-added steel and inhibition band, which is applied in the field of low-carbon boron-added steel, can solve problems such as stamping cracking and waste of raw materials
Active Publication Date: 2021-07-02
德龙钢铁有限公司
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Problems solved by technology
When a large amount of tertiary cementite is precipitated along the grain boundary and concentrated in a certain area, the crack sensitivity of this area is increased due to brittleness. If the product is used for stamping, a large number of local stamping cracks will occur. This will lead to the waste of raw materials, which will bring huge pressure on the cost and yield of downstream customers
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Embodiment 1
[0025] Embodiment 1: The weight percentage of the chemical composition of the low-carbon boron-added steel of the present invention is as follows: C: 0.033%, Mn: 0.20%, Si: 0.015%, P: ≤0.022%, S: ≤0.024%, B: 0.0030%, Ce : 0.001%, Mo: 0.0020%, and the rest are iron and unavoidable impurities.
[0029] Metallographic analysis: There is no mixed crystal phenomenon, and the tertiary cementite is extremely low at grade 0.5.
Embodiment 2
[0030] Embodiment 2: The weight percentage of the chemical composition of the low-carbon boron-added steel of the present invention is as follows: C: 0.040%, Mn: 0.18%, Si: 0.011%, P: ≤0.022%, S: ≤0.024%, B: 0.0025%, Ce : 0.0015%, Mo: 0.0028%, Ti: 0.020%, Ni: 0.0157%, Nb: 0.0012%, and the rest are iron and unavoidable impurities.
[0036] Embodiment 3: The weight percentage of the chemical composition of the low-carbon boron-added steel of the present invention is as follows: C: 0.050%, Mn: 0.17%, Si: 0.022%, P: ≤0.022%, S: ≤0.024%, B: 0.0016%, Ce : 0.001%, Mo: 0.0013%, Ti: 0.016%, Ni: 0.015%, Nb: 0.001%, and the rest are iron and unavoidable impurities.
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Abstract
The invention discloses low-carbon boron-added steel for inhibiting precipitation of tertiarycementite of strip steel along a grain boundary. The low-carbon boron-added steel comprises the following chemical components in percentage by weight: 0.033-0.050% of C, 0.17-0.20% of Mn, 0.011-0.023% of Si, less than or equal to 0.022% of P, less than or equal to 0.024% of S, 0.0016-0.0032% of B, 0.001-0.0017% of Ce, 0.0013-0.0030% of Mo and the balance of Fe and inevitable impurities. In order to solve the problem of precipitation of the tertiarycementite of the strip steel along the grain boundary of the low-carbon boron-added steel, the composition proportion of the low-carbon boron-added steel is improved, and a control formula of the boron equivalent in the low-carbon boron-added steel is provided through an analysis test, so that the adding amount of all alloy elements in the low-carbon boron-added steel is accurately controlled; and various mechanical properties of the low-carbon boron-added steel are guaranteed, precipitation of the tertiarycementite along the grain boundary is effectively inhibited, mixed crystals are eliminated or weakened, the influence of the tertiary cementite on the stamping performance of the steel grade is eliminated and reduced, and the elongation rate of a product is obviously improved.
Description
technical field [0001] The invention relates to a low-carbon steel, in particular to a low-carbon boron-added steel which suppresses the precipitation of tertiary cementite along the grain boundary of strip steel. Background technique [0002] The addition of a small amount of boron to carbon steel can significantly improve the hardenability of the steel, and the boron content of traditional boron-containing steel generally does not exceed 0.003%. The boron content in steel can replace the role of elements such as manganese, chromium, molybdenum and nickel within an appropriate range, and improve the overall performance of steel while reducing production costs. However, when boron is added to low carbon steel, since boron preferentially precipitates coarse boron nitride particles at high temperature, the grain boundary is inhibited, which affects the nucleation of ferrite, changes the nucleation rate of ferrite, and promotes the triple infiltration. The carbon body precipit...
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