Ultrafine grained hot rolled dual-phase steel with tensile strength of above 750MPa and manufacturing method of plate thereof

A hot-rolled dual-phase steel, tensile strength technology, applied in the field of steel rolling

Inactive Publication Date: 2010-11-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the production of traditional hot-rolled dual-phase steel, the present invention provides a low-cost high-strength ultra-fine-grained hot-rolled dual-phase steel and a manufacturing method thereof

Method used

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  • Ultrafine grained hot rolled dual-phase steel with tensile strength of above 750MPa and manufacturing method of plate thereof
  • Ultrafine grained hot rolled dual-phase steel with tensile strength of above 750MPa and manufacturing method of plate thereof
  • Ultrafine grained hot rolled dual-phase steel with tensile strength of above 750MPa and manufacturing method of plate thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The chemical composition of the experimental steel A is shown in Table 1. The initial thickness of the billet is 60 mm, and the thickness of the finished product is 3 mm. In order to completely dissolve the carbonitrides of Nb and Ti, the blank was heated to 1200°C in a box-type resistance furnace for 1 hour and then rolled and deformed 9 times. The deformation system is shown in Table 2. The rolling process is carried out on a Φ450×450 two-roll reversing hot rolling experimental unit. Continuous cooling is adopted after final rolling, and the coiling temperature is lower than 350°C. The cooling process parameters are shown in Table 3. The mechanical properties of the steel plates are listed in Table 4.

[0061] The chemical composition (%) of table 1 embodiment 1 experimental steel A

[0062]

[0063] The rolling schedule of table 2 embodiment 1

[0064]

[0065] The temperature and cooling system of table 3 embodiment 1

[0066]

[0067] The mechanical pr...

Embodiment 2

[0073] Example 2 The chemical composition of experimental steel B is shown in Table 5. The initial thickness of the billet is 60 mm, and the thickness of the finished product is 3 mm. The billet is heated to 1200° C. for 1 hour in a box-type resistance furnace, and then rolled and deformed for 9 passes. The deformation system is the same as in Example 1. The rolling process is carried out on a Φ450×450 two-roll reversing hot rolling experimental unit. Continuous cooling is adopted after final rolling, and the coiling temperature is lower than 350°C. The cooling process parameters are shown in Table 6. The mechanical properties of the steel plates are listed in Table 7.

[0074] The chemical composition (%) of table 5 embodiment 2 experimental steel B

[0075]

[0076] Temperature regime and cooling rate of table 6 embodiment 2

[0077]

[0078] The mechanical properties and tissue volume fraction of table 7 embodiment 2

[0079]

[0080] The final structure of exper...

Embodiment 3

[0082] Example 3 The chemical composition of experimental steel C is shown in Table 8. The initial thickness of the billet is 75 mm, and the thickness of the finished product is 4 mm. The billet was heated to 1200°C in a box-type resistance furnace for 1 hour and then rolled and deformed for 9 passes. The deformation system is shown in Table 9. The rolling process is carried out on a Φ450×450 two-roll reversing hot rolling experimental unit. Continuous cooling is adopted after final rolling, and the coiling temperature is lower than 350°C. The cooling process parameters are shown in Table 10. The mechanical properties of the steel plates are listed in Table 11.

[0083] The chemical composition (%) of table 8 embodiment 3 experimental steel C

[0084]

[0085] The rolling schedule of table 9 embodiment 3

[0086]

[0087] Temperature regime and cooling rate of table 10 embodiment 3

[0088]

[0089] The mechanical properties and tissue volume fraction of table 11 ...

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Abstract

The invention relates to ultrafine grained hot rolled dual-phase steel with tensile strength of above 750MPa and a manufacturing method of a plate thereof, belonging to the technical field of steel rolling, and the dual-phase steel comprises the following chemical components by weight percentage: 0.06-0.16% of C, 0.10-0.50% of Si, 1.00-2.00% of Mn, 0.02-0.06% of Al, 0.01-0.08% of Nb, 0-0.03% of Ti, not more than 0.1 of P, not more than 0.05 of S and the balance of Fe. The manufacturing method of the dual-phase steel comprises the following steps: 1) heating, heating a plate blank with the thickness of not less than 60mm to 1100-1250 DEG C, and keeping the temperature for 1-4h; 2) rolling and adopting the two-stage controlled rolling, wherein the reduction rate in a recrystallization zone is larger than 60%, the reduction rate in a non-recrystallization zone is larger than 70%, the initial rolling temperature of the recrystallization zone is 1100-1150 DEG C, the initial rolling temperature of the non-recrystallization zone is 880-940 DEG C, and the final rolling temperature is 770-860 DEG C; and 3) cooling, and adopting the continuous cooling after final rolling, wherein the cooling rate is 30-40 DEG C/s, the coiling temperature is lower than 350 DEG C, and the thickness of a finished product is 2-10mm. The manufacturing method can obtain the high-performance steel plate with high strength, low yield-strength ratio and good extension property, and the steel plate can be suitable for forming processing of high-strength automobiles, other industrial mechanical parts and the like.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a low-cost, high-strength, ultra-fine-grained hot-rolled dual-phase steel and a method for manufacturing the same. Specifically, it relates to a tensile strength (TS) above 750 MPa, and an elongation ≥ 21%. Strength ratio ≤ 0.67, that is, high-strength steel with excellent strength and formability. The high-strength steel plate of the invention is suitable for industrial fields such as automobiles, constructions, petroleum, ships and machinery. Background technique [0002] In recent years, the automobile industry has developed rapidly, and two main problems have arisen: one is that with the increase in the number of automobiles and the increase in speed, people have put forward higher requirements for the safety performance of automobiles. One of the important measures is to strengthen the automobile components. The second is energy shortage and environmental pollution. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 许云波董毅于永梅侯晓英吴迪王国栋
Owner NORTHEASTERN UNIV
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