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

Production method of steel hot-rolled steel strip with yield of 460 MPa for cold stamping axle housing

A production method and cold stamping technology are applied in the field of production of hot-rolled steel strips for yielding 460MPa cold-stamped axle housings, which can solve the problem of low strength level, unstable steel coil passing performance, and difficulty in meeting the fatigue of the axle bench test. cycle and other issues to achieve the effect of high hole expansion performance

Pending Publication Date: 2021-01-22
TANGSHAN STAINLESS STEEL +1
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the stamping process of axle housing steel mainly adopts heating first and then stamping. Heating will change the properties of steel, resulting in a low strength level, which is not conducive to material thinning and vehicle weight reduction. Lower C is generally used for axle housing steel materials. content, Nb or Ti microalloying, there is a problem of unstable coil performance, and due to composition design problems, it is difficult to meet the stamping process without cracking and the subsequent fatigue cycle of the axle bench test

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
  • Production method of steel hot-rolled steel strip with yield of 460 MPa for cold stamping axle housing
  • Production method of steel hot-rolled steel strip with yield of 460 MPa for cold stamping axle housing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the specification of the hot-rolled steel strip for the yield 460MPa cold stamping axle housing is 9.0mm. The chemical composition and mass percentage of the hot-rolled steel strip are shown in Table 1. Billet continuous casting, heating, rough rolling, finish rolling, cooling and coiling process, the specific process steps are as follows:

[0023] (1) Converter smelting process: molten iron and steel scrap are added in converter smelting, the total charge is 105t; the carbon at the end point of converter smelting is 0.020%, the number of supplementary blowing is 1 time, the standing time at the end point is 140s, the temperature at the end point of converter smelting is 1660°C, and the tapping method is double Gear (slide block slag + slag block mark) to reduce the amount of slag; blowing is carried out by high-strength supplementary blowing method, and post-stirring operation is adopted before the final tapping;

[0024] (2) Refining process of LF ...

Embodiment 2

[0033] In this embodiment, the specification of the hot-rolled steel strip for the yield 460MPa cold stamping axle housing is 10.0mm. The chemical composition and mass percentage of the hot-rolled steel strip are shown in Table 1. Billet continuous casting, heating, rough rolling, finish rolling, cooling and coiling process, the specific process steps are as follows:

[0034] (1) Converter smelting process: molten iron and steel scrap are added in converter smelting, with a total charge of 110t; the carbon at the end point of converter smelting is 0.040%, the number of supplementary blowing is 1 time, the resting time at the end point is 160s, the temperature at the end point of converter smelting is 1680°C, and the tapping method is double Gear (slide block slag + slag block mark) to reduce the amount of slag; blowing is carried out by high-strength supplementary blowing method, and post-stirring operation is adopted before the final tapping;

[0035] (2) Refining process of ...

Embodiment 3

[0044] In this example, the specification of the hot-rolled steel strip for yielding 460MPa cold stamping axle housing is 10.5mm. The chemical composition and mass percentage of the hot-rolled steel strip are shown in Table 1. The production methods include converter smelting, LF furnace refining, plate Billet continuous casting, heating, rough rolling, finish rolling, cooling and coiling process, the specific process steps are as follows:

[0045] (1) Converter smelting process: molten iron and steel scrap are added in converter smelting, the total charge is 105t; the carbon at the end point of converter smelting is 0.030%, the number of supplementary blowing is 1 time, the standing time at the end point is 160s, the temperature at the end point of converter smelting is 1680°C, and the tapping method is double Gear (slide block slag + slag block mark) to reduce the amount of slag; blowing is carried out by high-strength supplementary blowing method, and post-stirring operation...

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
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a production method of a steel hot-rolled steel strip with the yield of 460 MPa for a cold stamping axle housing. The production method comprises the procedures of converter smelting, LF refining, slab continuous casting, heating, rough rolling, finish rolling, cooling and coiling. By reasonably designing a hot rolling temperature system and a cooling strategy, adopting a high finish rolling temperature of 820-870 DEG C, fully exerting the strengthening effect of niobium and titanium microalloys and adopting means of fine grain strengthening, precipitation strengtheningand the like, the steel hot-rolled steel strip with the yield strength of 460 MPa for the cold stamping axle housing can still guarantee high hole expansion performance while having high strength, and can be used for manufacturing automobile parts with complex shapes. According to the steel hot-rolled steel strip with the yield of 460 MPa for the cold stamping axle housing, the tensile strength Rm ranges from 550 MPa to 720 MPa, the yield strength is larger than or equal to 460 MPa, the percentage elongation after fracture A is larger than or equal to 20%, the hole expansion rate is larger than or equal to 60%, and impact energy at 0 DEG C is larger than or equal to 200 J.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of a hot-rolled steel strip with a yield of 460MPa cold-stamped axle housing steel. Background technique [0002] With the increasing requirements of the automobile market for energy saving, environmental protection, safety, and comfort, the lightweight of automobile bodies has become an important development direction of today's automobile technology development. Due to the needs of environmental protection and energy saving, automobile lightweight has become a top priority, and it is also the trend of world automobile development. Especially in the industry of large passenger cars, heavy trucks, special vehicles, and semi-trailers, the application of higher-strength materials to auto parts can significantly reduce the weight of the vehicle, increase the load, and improve the service life of vehicle components, bringing logistics companies. Th...

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
IPC IPC(8): C21D8/02C22C38/04C22C38/02C22C38/14C22C38/12C22C38/06
CPCC21D8/0226C22C38/04C22C38/02C22C38/14C22C38/12C22C38/06
Inventor 闫萍张玉文尹宽李建设赵建勇王朋飞王立杰吕苗苗任振远
Owner TANGSHAN STAINLESS STEEL
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