Automotive cold-rolled diaphragm spring steel and production method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A cold-rolled film and leaf spring technology, applied in the field of spring steel, can solve problems such as affecting product quality, easy cracking of cast slabs, rolling fractures, etc., and achieves the effects of high elasticity, high fatigue resistance and long service life.
Active Publication Date: 2013-02-27
武汉钢铁有限公司
View PDF4 Cites 20 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] The purpose of the needle of the present invention is to solve the problems of easy rolling fracture and cracks inside the slab which affect product quality in hot rolling, so as to provide a diaphragm spring produced with high elastic limit, high yield limit, high resistance Cold-rolled diaphragm spring steel for automobiles with high fatigue limit performance and long service life and production method thereof
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0053] The present invention is described in detail below:
[0054] Table 1 is the component value list of each embodiment of the present invention and comparative example;
[0055] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;
[0056] Table 3 is each embodiment of the present invention and comparative example mechanical test result situation list;
[0057] Each embodiment of the present invention is produced according to the following steps:
[0058] Its steps:
[0059] 1) Desulfurization of molten iron;
[0060] 2) Converter smelting;
[0061] 3) Refining in LF furnace;
[0062] 4) Process in a RH vacuum furnace, and control the vacuum treatment time for not less than 18 minutes;
[0063] 5) Continuous casting billet: Electromagnetic stirring is carried out during the continuous casting process;
[0064] 6) Carry out temperature insulation of the casting slab in the insulation cover: the cooling rate i...
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
Login to view more
Abstract
The invention relates to automotive cold-rolled diaphragm spring steel and a production method thereof. The automotive cold-rolled diaphragm spring steel comprises the following components by weight percentage: C of 0.40-0.65, Si of 0.15-0.35, Mn of 0.60-1.00, P of less than or equal to 0.010. S of less than or equal to 0.007, Alt of less than or equal to 0.040, Ni of 0.20-0.50, Cr of 0.80-1.20, V of 0.27-0.55 and N of less than or equal to 0.005, and a tempered sorbite body is adopted as a control metallographic structure. The process comprises the steps of: desulphurization, smelting, refining, vacuum processing, continuous casting into a billet, thermal insulation in segments according to the temperature, heating of the cast billet, rolling, coiling, slow cooling, cutting, first annealing, first cold rolling, second annealing, second cold rolling, formation, quenching, tempering and preparation for use. The automotive cold-rolled diaphragm spring steel has excellent comprehensive mechanical properties. Difficulties in cutting and cold rolling can be reduced due to annealing, a tempered martensite structure is obtained due to heat treatment of quenching and tempering, and sufficient strength and wear resistance of the steel can be ensured due to composite reinforcing effects of micro-alloys such as Cr, Ni and V in the steel.
Description
technical field [0001] The invention relates to steel for springs, in particular to cold-rolled steel for automobile diaphragm springs and a production method thereof. Background technique [0002] Before the present invention was proposed, there were many similar technical products related to the field of alloy structural steel manufacturing, but few aimed at automobile diaphragm spring steel, especially cold-rolled automobile diaphragm spring steel. After a preliminary search, such as the patent document of the Chinese patent "Steel strip for automobile insurance belt spring leaf and its production method" patent application number CN200510110463.4, the involved steel has the following composition and mass percentage C≤0.15%, Si≤1.00%, Mn≤2.00%, Cr: 16.00~17.00%, Ni: 6.00~8.00%, P≤0.045%, S≤0.030%, and the rest is Fe and unavoidable impurities. Compared with the present invention, the cold-rolled steel strip has more Cr and Ni added to the chemical composition, higher Si ...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more