High-strength steel capable of resisting hydrogen-induced delayed cracking and preparation method thereof
A technology for delayed cracking and high-strength steel, applied in the field of high-strength steel, can solve problems such as delayed cracking, impact on automobile safety, and increased sensitivity to delayed fracture, and achieve improved strength and toughness, good resistance to hydrogen-induced delayed cracking, and suppression of hydrogen The effect of diffusion
Active Publication Date: 2017-11-17
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
However, as the strength of the material increases, its sensitivity to delayed fracture generally increases. Like other high-strength steels, hot stamping steel may cause delayed cracking when the steel contains a small amount of hydrogen, which seriously affects the safety of the car.
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[0023] The invention provides a high-strength steel resistant to hydrogen-induced delayed cracking and a preparation method. The high-strength steel is composed of: C: 0.22-0.25%, Si: 0.25-0.35%, Mn: 1.2-1.4%, S: ≤0.005 %, P: ≤0.02%, Al: 0.02~0.05%, Ti: 0.02~0.05%, Cr: 0.11~0.2%, B: 0.002~0.0035%, Nb: 0.025~0.055%, N: N / (Ti+ Nb)=1 / 8~1 / 6, Fe: balance.
[0024] See Table 1 for the weight percentages of the chemical components of the high-strength steel with hydrogen-induced delayed cracking resistance after microalloying treatment according to the present invention and the comparative example alloy steel. Each embodiment of the present invention and comparative example are all produced according to the following steps:
[0025] 1) Smelting in a 50KG vacuum induction furnace;
[0026] 2) Molten steel is cast into an ingot and forged into a billet with a thickness of 30mm×width 160mm×length;
[0027] 3) Saw and cut into blanks with thickness 30mm×width 160mm×length 70mm;
[00...
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Abstract
The invention provides high-strength steel capable of resisting hydrogen-induced delayed cracking and a preparation method thereof, and belongs to the technical field of high-strength steel. The high-strength steel comprises, by mass percentage, 0.22-0.25% of C, 0.25-0.35% of Si, 1.2-1.4% of Mn, less than or equal to 0.005% of S, less than or equal to 0.02% of P, 0.02-0.05% of Al, 0.02-0.05% of Ti, 0.11-0.2% of Cr, 0.002-0.0035% of B, 0.025-0.055% of Nb, N and the balance Fe, wherein N / (Ti+Nb) is equal to 1 / 8-1 / 6. The high-strength steel and the preparation method have the advantages that the trace Nb and the trace N are added into 22MnB5 steel so as to achieve Ti, Nb and N composite micro-alloying, and nano-scale (<10nm) carbon nitrides which are dispersively distributed can be separated out in the tissue of a material; the precipitate can form a hydrogen trap and has a pinning effect on hydrogen, the diffusion of hydrogen is inhibited, the hydrogen is uniformly distributed in a matrix so that hydrogen atoms can be prevented from gathering into hydrogen groups, and therefore the steel has the capacity of resisting hydrogen induced delayed cracking; and the steel also has the good mechanical property, and the yield strength and the toughness of the steel are better than the yield strength and the toughness of the same material with the Nb content beyond the range.
Description
technical field [0001] The invention relates to the technical field of high-strength steel, in particular to a high-strength steel resistant to hydrogen-induced delayed cracking and a preparation method thereof. Background technique [0002] Lightweight, low pollution, and high safety are the goals pursued by the new generation of automobiles, making it inevitable to replace traditional low-strength steel plates with advanced high-strength steels. Through the reasonable matching of body parts thinning and high strength, not only the weight of the body can be effectively reduced, the fuel consumption can be reduced, but also the safety and comfort of the vehicle can be improved. [0003] At present, advanced high-strength steels that have been developed include DP steel, TRIP steel, MS steel, and high-hole expansion steel. Steel plate hot stamping technology is a new technology developed and applied in the past 30 years. As an effective way to obtain ultra-high-strength stam...
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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/28C22C38/32C22C38/26C21D8/02
CPCC21D8/0226C21D8/0236C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/32
Inventor 李晓刚黄运华程学群董超芳肖葵范恩点
Owner UNIV OF SCI & TECH BEIJING