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Skip-plating-free pre-coating hot-forming steel plate with low crack sensitivity and manufacturing method

A manufacturing method and sensitive technology, applied in the direction of coating, hot dip plating process, metal material coating process, etc., to achieve the effect of strong fracture resistance

Active Publication Date: 2021-10-01
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the heat treatment process of the steel strip before pre-coating mainly relies on radiation heat transfer to keep the steel strip at a certain temperature, it is almost impossible to obtain a uniform thickness without affecting the peak force through the annealing process + atmosphere adjustment on the industrial line. Decarburization layer effect; In addition, the current existing technology only pays attention to the failure of the material when it cracks, and does not pay attention to the impact of crack propagation after cracking

Method used

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  • Skip-plating-free pre-coating hot-forming steel plate with low crack sensitivity and manufacturing method
  • Skip-plating-free pre-coating hot-forming steel plate with low crack sensitivity and manufacturing method
  • Skip-plating-free pre-coating hot-forming steel plate with low crack sensitivity and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A non-spill-coated pre-coated hot-formed steel sheet with low crack sensitivity in this embodiment, the base steel sheet contains the following components in terms of mass percentage: C: 0.10-0.36%, Si: ≤0.5%, Mn: 0.5 -1.5%, P: ≤0.020%, S: ≤0.010%, Cr: ≤0.50%, Al: 0.01-0.06%, Nb+V+Ti≤0.15%, Mo: ≤0.5%, the rest is Fe and unavoidable impurities, by adjusting the C content of the matrix, a sufficiently high peak force of cold bending can be obtained under a certain thickness of the decarburized layer; during cold bending, when the peak force of cold bending is reached, the slope between the cold bending force and the displacement As the thickness of the decarburization layer changes, that is, the thickness of the decarburization layer will have a certain impact on the crack growth. The slower the crack growth rate, the stronger the fracture resistance of the material.

[0058] Further, more than one of the three elements in the Nb, V, and Ti are combined, and the effect of...

Embodiment 2

[0060] A non-spill-coated pre-coated hot-formed steel sheet with low crack sensitivity in this embodiment has the same basic structure as that of Embodiment 1, the difference and improvement are: for the 1500MPa strength level, the base steel sheet contains The following components are: C: 0.23-0.24%, Si: ≤0.5%, Mn: 1.2-1.3%, P: ≤0.020%, S: ≤0.010%, Cr: ≤0.50%, Al: 0.01-0.06%, Nb +V+Ti≤0.15%, B: 0.002%~0.005%, the rest is Fe and unavoidable impurities.

[0061] Further, two or more of the three elements of Nb, V and Ti are combined, and the Ti: 0.015-0.035%.

Embodiment 3

[0063] A non-spill-coated pre-coated hot-formed steel sheet with low crack sensitivity in this embodiment has the same basic structure as that of Embodiment 2, the difference and improvement are: for the 1800MPa strength level, the base steel sheet contains The following components are: C: 0.33-0.36%, Si: ≤0.5%, Mn: 1.2-1.3%, P: ≤0.020%, S: ≤0.010%, Cr: ≤0.50%, Al: 0.01-0.06%, Nb +V+Ti≤0.15%, Mo:≤0.5%, the rest is Fe and unavoidable impurities.

[0064] Further, such as figure 1 , 2 , 4, more than one of the three elements of Nb, V, and Ti are combined, the Nb: 0.03% to 0.05%, when the Nb content is less than 0.03%, it is easy to cause the grain refinement effect is not obvious ; When the Nb content is greater than 0.05%, it will cause unnecessary waste.

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Abstract

The invention discloses a skip-plating-free pre-coating hot-forming steel plate with low crack sensitivity and a manufacturing method and relates to the technical field of hot galvanizing. According to the skip-plating-free pre-coating hot-forming steel plate with the low crack sensitivity and the manufacturing method, the matrix steel plate comprises the following ingredients of, in percentage by mass, 0.10-0.36% of C, less than or equal to 0.5% of Si, 0.5-1.5% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.50% of Cr, 0.01-0.06% of Al, less than or equal to 0.15% of Nb+V+Ti, less than or equal to 0.5% of Mo and the balance Fe and inevitable impurities. By means of control of all technological process parameters and the matrix C content, a decarburized layer with the depth ranging from 5 micrometers to 10 micrometers is obtained, the steel plate matrix is made to obtain uniform ferrite and pearlite tissue, meanwhile, the cold bending performance after hot forming is improved, and the material is made to have the low crack sensitivity and the skip-plating prevention performance.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanizing, in particular to a leak-free pre-coated hot-formed steel sheet with low crack sensitivity and a manufacturing method. Background technique [0002] For thermoformed parts, the strength after thermoforming can reach 1500MPa, and even some products can reach 2000MPa, but there are also problems such as insufficient plasticity and toughness. The elongation after thermoforming is only about 5%, and the VDA cold bending angle is only about 55° (aluminum silicon coated board). [0003] With the continuous deepening of the research on the safety performance of car body collision, it is found that when the car body collides, the first part failure will occur due to the failure of material strain. Some researchers also compared and analyzed the relationship between the crash performance of parts and the basic performance of materials, and found that the VDA bending angle is the best relevant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/24C22C38/26C22C38/28C23C2/12C23C2/40C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/24C22C38/28C22C38/26C21D8/0205C21D8/0226C21D8/0236C21D8/0247C23C2/12C23C2/40C21D2211/005C21D2211/009
Inventor 晋家春周世龙王蕾崔磊邓宗吉陈直朋谷海容刘永刚詹华何丹丹
Owner MAANSHAN IRON & STEEL CO LTD
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