High-strength steel plate with 900 Mpa-level yield strength and preparation method of steel plate
A technology of high-strength steel plate and manufacturing method, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of low low temperature impact toughness, high cost, long process time, etc. The effect of low temperature toughness and excellent cold bending performance
Active Publication Date: 2013-04-03
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0005] CN1840724A discloses a high-strength steel plate above 960MPa, which is rolled by TMCP, water-cooled to Ms-Ms+100°C after rolling, and then reheated offline to 350-550°C for tempering. The process takes a long time and costs high, and the added alloy elements are also More, there is no advantage in cost, and its low temperature impact toughness is not high, the actual -40 ℃ A kv Only 33-50J
[0006] Therefore, the current low-alloy 900MPa grade high-strength steel plate cannot fully meet the requirements of high and low temperature toughness.
Method used
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Embodiment 1
[0054] The molten steel smelted according to the proportions in Table 1 is subjected to vacuum degassing and then continuous casting or die casting. The thickness of the slab is 80 mm. Rolled into a steel plate with a thickness of 6mm, the total reduction ratio is 94%, and the final rolling temperature is 880°C, then water cooled to 220°C at 50°C / s and then rapidly heated online to 480°C for tempering, and then air-cooled to room temperature;
[0055] The metallographic structure of part of the steel plate in this embodiment is as follows: figure 1 shown.
[0056] The detailed composition of Examples 2-5 is shown in Table 1 and the process is the same as that of Example 1, and the process parameters are shown in Table 2.
[0057]
[0058] Table 2 Process parameters and steel plate thickness of Embodiment 1-5 of the present invention
[0059]
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Abstract
The invention relates to a high-strength steel plate, comprising the following chemical ingredients in percentage by weight: 0.07-0.11% of C, 0.10-0.35% of Si, 1.0-1.4% of Mn, not greater than 0.015% of P, not greater than 0.010% of S, 0.02-0.04% of Al, 0.01-0.03% of Ti, not greater than 0.006% of N, not greater than 0.005% of Ca, more than one of not greater than 0.70% of Cr, not greater than 0.30% of Ni and not greater than 0.30% of Mo, and the balance of iron and inevitable impurities. A preparation method comprises the following steps of: heating a continuous casting blank or a steel blank at 1100-1250 DEG C, and then performing one-pass rolling or multi-pass rolling on the continuous casting blank or the steel blank, wherein the total reduction rate is not less than 70%, and the finish rolling temperature is not lower than 860 DEG C; carrying out water cooling the rolled steel plate to a temperature range from 220 to 260 DEG C at a cooling speed ranging from the critical cooling speed Vmin of martensite to 50 DEG C / s, and carrying out air cooling for 5-60 seconds; and conveying the steel plate in an online induction heating furnace and rapidly heating the cooled steel plate to 480-520 DEG C at a speed of 1-10 DEG C / s, tempering for 15-25 seconds, and then discharging from a furnace and carrying out air cooling. The obtained steel plate which is 6-25 mm thick has a yield strength of not less than 900 MPa, an elongation A50 of not less than 18%, and Akv of not less than 150 J at minus 60 DEG C, and is excellent in cold-bending performance.
Description
technical field [0001] The invention relates to a high-strength steel plate, in particular to a high-strength steel plate with a yield strength above 900 MPa and a manufacturing method thereof. The steel plate of the invention has better low-temperature toughness, and is suitable as a high-yield steel plate for high-strength impact-resistant structural parts such as automobiles and engineering machinery. Background technique [0002] As an important steel material, low-alloy high-strength steel is widely used in automobiles, mining machinery, construction machinery, agricultural machinery, and railway transportation. With the rapid development of my country's industry, the complexity, large-scale and lightweight of various mechanical equipment have put forward higher requirements for this type of steel, that is, the low-alloy high-strength steel plates used to manufacture these equipment not only require higher Hardness, strength, but also requires good toughness and formabi...
Claims
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IPC IPC(8): C22C38/54C22C38/50C22C38/28B21B37/00C21D9/00
Inventor 张爱文焦四海袁向前
Owner BAOSHAN IRON & STEEL CO LTD