Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of steel wire rod for 14.9 grade high-strength fasteners and its preparation method

A high-strength, steel wire rod technology, applied in the field of steel wire rods for 14.9 high-strength fasteners and its preparation, can solve problems that do not involve delayed fracture performance of bolts, achieve enhanced hydrogen traps, and facilitate mass production , Good resistance to delayed fracture performance

Active Publication Date: 2021-07-13
NANJING IRON & STEEL CO LTD
View PDF0 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of steel wire rod for 14.9 grade high-strength fasteners and its preparation method
  • A kind of steel wire rod for 14.9 grade high-strength fasteners and its preparation method
  • A kind of steel wire rod for 14.9 grade high-strength fasteners and its preparation method

Examples

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]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
reduction of areaaaaaaaaaaa
strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a 14.9-grade steel wire rod for high-strength fasteners and a preparation method thereof. Its chemical composition contains: C: 0.44-0.48%, Si: ≤0.20%, Mn: 0.40-0.80% in mass percentage , P: ≤0.015%, S: ≤0.010%, Cr: 1.0‑1.5%, Mo: 0.6‑0.8%, Nb: 0.03‑0.06%, V: 0.2‑0.5%, Ti: 0.03‑0.06%, Ni: ≤0.20%, Cu: ≤0.20%, Alt: 0.010‑0.050%, N: 0.0080‑0.0160%, H: ≤0.00015%, O: ≤0.0015%, the balance is Fe and impurities; the steel wire rod can improve the finished product The tensile strength of the bolt is high, and it has excellent resistance to delayed fracture.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com