Steel plate strip for 14.9-grade high-strength fastener and preparation method of steel plate strip

A technology for high-strength fasteners, applied in the field of 14.9 grade steel wire rods for high-strength fasteners and its preparation, can solve problems that do not involve delayed fracture performance of bolts, achieve enhanced hydrogen trap effect, and good resistance to delayed fracture Performance, easy effect of alloy system

Active Publication Date: 2019-11-19
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there are no clear standards or regulations on the delayed fracture of tempered martensitic fastener steel at home and abroad. Although there are some invention patents for the delayed fracture performance of high-strength fasteners or high-strength bolts, due to the The level is low and does not exceed 1300MPa level, and does not involve the delayed fracture performance of bolts with higher strength levels

Method used

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  • Steel plate strip for 14.9-grade high-strength fastener and preparation method of steel plate strip
  • Steel plate strip for 14.9-grade high-strength fastener and preparation method of steel plate strip
  • Steel plate strip for 14.9-grade high-strength fastener and preparation method of steel plate strip

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: The chemical composition of steel wire rod contains C: 0.47%, Si: 0.12%, Mn: 0.65%, P: 0.008%, S: 0.002%, Cr: 1.32%, Mo: 0.72%, Nb: 0.035%, V: 0.3%, Ti: 0.04%, Ni: 0.08%, Cu: 0.15%, Alt: 0.035%, N: 0.0085%, H: 0.00010%, O: 0.0012%, the balance is Fe and Impurities. The specific preparation process scheme is shown in Table 1.

[0027] The preparation process scheme of table 1 embodiment 1

[0028]

[0029] Table 2 shows the test results of the technical indicators of the finished steel wire rod prepared by the above preparation scheme.

[0030] The steel wire rod technical index detection result of table 2 embodiment 1

[0031]

[0032] This embodiment also provides a group of experimental materials to verify the changes in Mo content and V, Nb, Ti content, and the performance difference of the steel wire rod. The chemical composition of the specific experimental materials is shown in the table below. Except for the above-mentioned decisive elemen...

Embodiment 2

[0038] Embodiment 2: the chemical composition of steel wire rod contains C: 0.46%, Si: 0.14%, Mn: 0.68%, P: 0.008%, S: 0.003%, Cr: 1.25%, Mo: 0.65%, Nb: 0.041%, V: 0.32%, Ti: 0.046%, Ni: 0.06%, Cu: 0.13%, Alt: 0.032%, N: 0.0087%, H: 0.00011%, O: 0.0014%, and the balance is Fe and Impurities. The specific preparation process scheme is shown in Table 4.

[0039] The preparation process scheme of table 4 embodiment 2

[0040]

[0041]

[0042] Table 5 shows the test results of the technical indicators of the finished steel wire rod prepared by the above preparation scheme.

[0043] The steel wire rod technical index detection result of table 5 embodiment 2

[0044]

Embodiment 3

[0045] Embodiment 3: the chemical composition of steel wire rod contains C: 0.44%, Si: 0.2%, Mn: 0.80%, P: 0.015%, S: 0.010%, Cr: 1.0%, Mo: 0.60%, Nb: 0.03%, V: 0.50%, Ti: 0.06%, Ni: 0.2%, Alt: 0.05%, N: 0.016%, H: 0.00015%, and the balance is Fe and impurities. The specific preparation process scheme is shown in Table 6.

[0046] The preparation process scheme of table 6 embodiment 3

[0047]

[0048]

[0049] The test results of the technical indicators of the finished steel wire rod prepared by the above preparation scheme are shown in Table 7.

[0050] The steel wire rod technical index detection result of table 7 embodiment 3

[0051]

[0052]

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Abstract

The invention discloses a steel plate strip for a 14.9-grade high-strength fastener and a preparation method of the steel plate strip. The steel plate strip is prepared from the chemical components inpercentage by mass: 0.44-0.48% of C, smaller than or equal to 0.20% of Si, 0.40-0.80% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, 1.0-1.5% of Cr, 0.6-0.8% of Mo, 0.03-0.06% of Nb, 0.2-0.5% of V, 0.03-0.06% of Ti, smaller than or equal to 0.20% of Ni, smaller than or equal to 0.20% of Cu, 0.010-0.050% of Alt, 0.0080-0.0160% of N, smaller than or equal to 0.00015% of H, smaller than or equal to 0.0015% of O, and the balance of Fe and impurities. According to the steel plate strip for the 14.9-grade high-strength fastener, the tensile strength of a finishedbolt can be improved, and the excellent delayed fracture resistance is achieved.

Description

technical field [0001] The invention relates to a steel for fasteners and a preparation method thereof, in particular to a 14.9 grade steel wire rod for high-strength fasteners and a preparation method thereof. Background technique [0002] The rapid development of the automobile industry has increased the demand for steel materials. Although my country has been the world's largest steel producer for many years, the steel used for automobile engines and key component fasteners is still mainly imported products due to the limitation of strength. The development trend of high performance and light weight of automobiles puts forward higher requirements for the design stress and light weight of automobile fasteners, and high strength steel for fasteners is the most effective way to solve this requirement. [0003] At present, the high-strength bolts used in automobile engines, chassis and body are mainly 8.8, 10.9 and 12.9 grades, and the steel wire rods for high-strength fastene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/44C22C38/46C22C38/48C22C38/50C22C38/42C22C38/22C22C38/26C22C38/24C22C38/20C22C38/28C22C38/06C21D8/06
CPCC21D8/065C22C38/001C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 郑宏伟王磊刘文学陈兆勇
Owner NANJING IRON & STEEL CO LTD
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