Yield strength 420mpa grade cold-rolled low-alloy high-strength steel and manufacturing method thereof
A technology of yield strength and manufacturing method, which is applied in the field of cold-rolled low-alloy high-strength steel with a yield strength of 420MPa and its manufacture, can solve the problems of high cost and high cost of ferroniobium alloy, and achieve the effect of increasing strength and stabilizing production
Active Publication Date: 2019-10-15
LIUZHOU IRON & STEEL +1
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The traditional cold-rolled low-alloy high-strength steel adopts the composite strengthening mechanism of niobium and titanium. Through the addition of niobium and titanium, carbides of niobium and titanium are formed, and niobium carbon and nitrogen compounds are formed by using niobium and carbon, nitrogen and other elements in the steel to achieve precipitation strengthening and The effect of precipitation strengthening can achieve the improvement of material strength and play the role of strength improvement. Due to the high cost of ferroniobium alloy, the cost is high
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0019] A cold-rolled low-alloy high-strength steel with a yield strength of 420MPa, the main chemical composition range of which is calculated by weight percentage: C: 0.06-0.10Wt%, Si: 0.10-0.25Wt%, Mn: 1.25-1.70Wt%, P ≤0.025Wt%, S≤0.015Wt%, Alt: 0.020~0.050Wt%, Ti: 0.031-0.05Wt%; the balance is Fe and unavoidable trace elements.
[0020] According to the above design scheme, embodiments of the present invention are as follows:
[0021] Product chemical composition (wt%)
[0022] example C Si mn P S Alt Ti Example 1 0.09 0.20 1.58 0.013 0.004 0.034 0.039 Example 2 0.07 0.22 1.64 0.015 0.006 0.038 0.032 Example 3 0.07 0.20 1.70 0.015 0.010 0.032 0.031 Example 4 0.09 0.18 1.25 0.013 0.008 0.034 0.050 Example 5 0.06 0.21 1.45 0.015 0.006 0.034 0.035
[0023] A method for manufacturing cold-rolled low-alloy high-strength steel with a yield strength of 420MPa. The chemical composition range is ca...
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
| Property | Measurement | Unit |
|---|---|---|
| yield strength | aaaaa | aaaaa |
| elongation | aaaaa | aaaaa |
| yield strength | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses cold-rolled low alloy and high strength steel with the yield strength of 420 MPa and a manufacturing method of the cold-rolled low alloy and high strength steel. The cold-rolled low alloy and high strength steel mainly comprises chemical components including, by weight percent, 0.06%-0.10% of C, 0.10%-0.25% of Si, 1.25%-1.70% of Mn, smaller than or equal to 0.025% of P, smaller than or equal to 0.015% of S, 0.020-0.050% of Alt, 0.031%-0.05% of Ti and the balance Fe and inevitable microelements. The cold-rolled low alloy and high strength steel has the beneficial effectsthat the product yield strength Rp0.2 ranges from 420 MPa to 480 MPa, the tensile strength Rm ranges from 490 MPa to 590 MPa, and the elongation rate A80 mm is larger than or equal to 19%. Due to optimal design of components, only a small amount of the titanium element is added, niobium is not added, a carbon nitride compound of titanium is formed by titanium and elements such as carbon and nitrogen in steel, the functions of precipitation strengthening and settling strengthening are achieved, and therefore the strength of the steel is improved, stable production of the product is achieved, and the cold-rolled low alloy and high strength steel with stable mechanical performance and good cold forming performance is obtained.
Description
technical field [0001] The invention relates to the technical field of steel production and manufacturing, in particular to a cold-rolled low-alloy high-strength steel with a yield strength of 420 MPa and a manufacturing method thereof. Background technique [0002] Cold-rolled low-alloy high-strength steel is to add a small amount of alloying elements such as niobium and titanium to low-carbon steel to refine the grain and form carbides with carbon, nitrogen and other elements, and the nitrides are precipitated on the ferrite matrix to improve the strength of the steel. strength. This kind of steel has good formability, high strength and welding performance, and is mainly used in the automotive industry or machining industry, such as automotive door hinge reinforcement plates, beams and other structural parts. [0003] At present, the composition design of this level of cold-rolled low-alloy high-strength steel is generally strengthened by adding niobium and titanium compo...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D8/02C21D1/26
Inventor 叶姜杨跃标邓深樊雷袁勤攀张广川李显强
Owner LIUZHOU IRON & STEEL