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Q&P steel compounded with vanadium and titanium and manufacturing method thereof

A technology of composite addition and manufacturing method, which is applied in the field of Q&P steel with titanium composite addition and its manufacture, and vanadium, which can solve the problems of difficult control of quenching temperature, etc., and achieve the effects of low production cost, excellent strength and toughness matching, and low energy consumption

Active Publication Date: 2017-03-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in the production process between the one-step Q&P process containing titanium and vanadium and the two-step method, the main reason is that the quenching temperature is difficult to control

Method used

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  • Q&P steel compounded with vanadium and titanium and manufacturing method thereof
  • Q&P steel compounded with vanadium and titanium and manufacturing method thereof
  • Q&P steel compounded with vanadium and titanium and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, smelting and continuous casting are carried out according to the above composition range, and then the composition of the slab is detected, as shown in Table 1 below.

[0030] Table 1 Slab composition (wt.%)

[0031]

[0032] The hot rolling adopts the following process: heat the prepared slab from room temperature to 1200°C, keep it warm for 2 hours, start rolling at 1150°C, and finish hot rolling at 900°C. When the billet is air-cooled to 800°C, water cooling starts, the cooling rate is 20°C / s, and coiling starts when the billet is cooled to below 190°C. At this time, the structure of the hot-rolled sheet is ferrite + martensite + bainite, see figure 2 , The thickness of the hot-rolled plate is 3.6mm. The cold-rolling process is as follows: the hot-rolled plate is pickled and then cold-rolled, the cold-rolled reduction rate is 58%, and the thickness of the cold-rolled plate is 1.5mm. The following three examples are taken for different distribution tempe...

Embodiment 2

[0038] First, smelting and continuous casting are carried out according to the above composition range, and then the composition of the slab is detected, see Table 3 below.

[0039] Table 3 Slab composition (wt.%)

[0040]

[0041] The hot rolling adopts the following process: heating the prepared slab from room temperature to 1170°C, holding it for 1.7 hours, starting the rolling temperature at 1150°C, and finishing the hot rolling at 920°C; When the billet is air-cooled to 820°C, water cooling starts, the cooling rate is 25°C / s, and coiling starts when the billet is cooled to below 190°C. At this time, the structure of the hot-rolled sheet is ferrite + martensite + bainite, see figure 2 , The thickness of the hot-rolled plate is 3.5mm. The cold-rolling process is as follows: the hot-rolled plate is pickled and then cold-rolled, the cold-rolled reduction rate is 70%, and the thickness of the cold-rolled plate is 2.45mm. The following three examples are taken for differ...

Embodiment 3

[0047] First, smelting and continuous casting are carried out according to the above composition range, and then the composition of the slab is detected, see Table 5 below.

[0048] Table 5 Slab Composition (wt.%)

[0049]

[0050] The hot rolling adopts the following process: heat the prepared slab from room temperature to 1220°C, keep it warm for 1.5 hours, start rolling at 1150°C, and finish hot rolling at 890°C. When the billet is air-cooled to 780°C, water cooling starts, the cooling rate is 15°C / s, and coiling starts when the billet is cooled to below 190°C. At this time, the structure of the hot-rolled sheet is ferrite + martensite + bainite, see figure 2 , The thickness of the hot-rolled plate is 4.5mm. The cold-rolling process is as follows: the hot-rolled plate is pickled and then cold-rolled, the cold-rolled reduction rate is 50%, and the thickness of the cold-rolled plate is 2.1mm. The following three examples are taken for different distribution temperature...

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Abstract

The invention discloses Q&P steel with vanadium and titanium added in a compounded manner and a manufacturing method of the Q&P steel and belongs to the field of third-generation automobile steel research. The Q&P steel with vanadium and titanium added in the compounded manner is capable of saving energy and efficient and comprises the components of, by weight, 0.17% to 0.22% of C, 1.3% to 1.6% of Si, 1.5% to 2.2% of Mn, not larger than 0.010% of P, not larger than 0.008% of S, 0.03% to 0.070% of V, 0.02% to 0.04% of Ti, the balance being Fe and inevitable impurities. The grain refinement effect is achieved through Ti in the steel and the precipitation strengthening effect is achieved through V. The manufactured energy-saving efficient Q&P steel is of a polygonal ferrite structure, a martensite structure and a retained austenite structure, the yield strength ranges from 550 MPa to 650 MPa, the tensile strength ranges from 1350 MPa to 1450 MPa, the percentage elongation after fracture is larger than or equal to 15.0%, and the product of strength and elongation is larger than or equal to 22.0 GPa*%.

Description

technical field [0001] The invention belongs to the field of Q&P steel production and research of third-generation automobile steel, in particular to a Q&P steel with energy-saving and high-efficiency vanadium and titanium composite addition and a manufacturing method thereof. Background technique [0002] Since the advent of the first generation of automobiles in the 1880s, especially since the 1960s and 1970s, the automobile industries in North America, Japan and Western Europe have developed rapidly. Automobile is one of the pillar industries of my country's national economy, which plays a very important role in stimulating the national economy and ensuring employment. In recent years, my country's automobile production and sales have increased year by year. In 2013, my country's automobile production was 22.1168 million, and sales volume was 21.9841 million; in 2014, my country's automobile production and sales both exceeded 23 million; 25 million vehicles. In the past ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 于浩宋成浩卢军李莉莉
Owner UNIV OF SCI & TECH BEIJING
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