Ultra-high-strength hot-rolled strip steel and its production method
A production method and strong heat technology, applied in the field of steel rolling, can solve the problems of high cost, time-consuming and laborious, low material strength level, etc., and achieve the effect of improving material strength and low cost
Active Publication Date: 2015-08-26
SHOUGANG CORPORATION
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Problems solved by technology
[0003] In the field of ultra-high-strength steel production, the deficiencies of existing technologies are mainly manifested in the following aspects: (1) The cost of the alloy is high, and more precious metal elements such as Mo, Cr, and Ni are added
(2) The strength level of materials produced by hot continuous rolling is low, and the strength level that can be stably produced at present is 700MPa
(3) The process of some existing ultra-high-strength steel production technologies is relatively complicated, and most of the production of ultra-high-strength steel requires quenching and tempering treatment, that is, quenching + tempering treatment, which requires steel plants to have quenching and tempering lines for production, which is time-consuming Laborious, resource consuming, costly
Method used
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Embodiment 1
[0046] The composition system of the low-cost ultra-high-strength hot-rolled steel strip provided by the embodiment of the present invention is shown in Table 1.
[0047] Table 1
[0048] Numbering
C
Si
mn
P
S
Alt
B
[N]
1
0.26
0.22
1.32
0.014
0.003
0.041
0.0034
0.004
2
0.27
0.25
1.26
0.012
0.004
0.042
0.0032
0.005
3
0.26
0.28
1.40
0.012
0.003
0.037
0.0035
0.006
[0049] The production method of the ultra-high-strength hot continuous rolling steel strip provided by the embodiment of the present invention, according to the chemical composition shown in Table 1, produces 2-6mm ultra-high-strength steel, and the production process route adopts 220 tons of converter smelting-continuous casting-heating furnace reheating - rough rolling - 6 / 7 stand finish rolling - laminar cooling - coiling into coils.
[0050] The molt...
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Abstract
The invention provides an ultrahigh-strength continuously hot-rolled steel strip, which comprises the following chemical components in percentage by mass: 0.26-0.30% of C, 0.20-0.30% of Si, 1.0-1.5% of Mn, 0.0030%-0.0035% of B, 0.01-0.06% of Al, less than or equal to 0.02% of P, less than or equal to 0.010% of S, less than or equal to 0.008% of N, and the balance of Fe and unavoidable impurities. The invention also provides a method for producing the ultrahigh-strength continuously hot-rolled steel strip. The ultrahigh-strength continuously hot-rolled steel strip is designed by using low-cost alloying elements without adding precious metal elements, and the adjustability of the tensile strength and the like is large, therefore, the cost saving is facilitated, the waste of resources is avoided, and the improvement of product safety can be facilitated.
Description
technical field [0001] The invention relates to the technical field of steel rolling, in particular to an ultra-high-strength hot continuous rolling strip steel and a production method thereof. Background technique [0002] With the rapid development of microalloying technology and controlled rolling technology, as well as the continuous improvement of equipment level and capacity of iron and steel production enterprises, high-strength steel with a yield strength of 700MPa can be stably produced by hot continuous rolling, while hot continuous rolling The production technology of rolling 1200MPa-1600MPa ultra-high-strength steel is still in its infancy. [0003] In the field of ultra-high-strength steel production, the deficiencies of existing technologies are mainly manifested in the following aspects: (1) The cost of the alloy is high, and more precious metal elements such as Mo, Cr, and Ni are added. (2) The strength level of the material produced by hot continuous rollin...
Claims
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IPC IPC(8): C22C38/06C21D8/02
Inventor 潘辉李飞朱国森代晓莉郭佳周娜赵林
Owner SHOUGANG CORPORATION