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Yield strength 890mpa grade high-strength high-toughness steel plate and production method thereof

A yield strength and production method technology, applied in the field of medium and heavy plate production, can solve the problems of low final cooling temperature, unstable steel plate performance, low low temperature impact toughness, etc., and achieve the effects of excellent mechanical properties and significant social benefits.

Active Publication Date: 2017-01-11
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the patent document of the Chinese patent application number "201310083414.0" titled "A High Yield Strength S89OQL Structural Steel Plate and Its Production Method", a low-carbon design is adopted, and precious metal elements such as Cr and Ni are moderately added to prepare a yield strength of 890MPa. Grade steel plate, but the final cooling temperature of the steel plate is 450-550°C, the final cooling temperature is low, and it is not easy to control the shape of the steel plate
[0004] In the patent document of Chinese patent application number "200910011958.X" titled "A quenched and tempered steel plate with yield strength of 900MPa and its manufacturing method", it is prepared by adopting low-carbon composition design, adding some alloy elements, and adding quenching and tempering process through TMCP 900MPa high-strength steel for engineering machinery, but its low-temperature impact toughness is low, about 21J at -40°C, and the tempering temperature of the steel plate is low, so it is not easy to release the internal stress of the steel plate
[0005] In the patent document of Chinese patent application number "201210147571.9" titled "a 900MPa grade ultra-high toughness low-alloy steel and its manufacturing method", the ultra-low carbon and ultra-high manganese design was adopted, and the yield strength 900MPa grade steel plate was prepared through the TMCP+tempering process , but practice has proved that the performance of the steel plate with a yield strength of 890 MPa and above prepared by the TMCP + tempering process is very unstable, and it is not suitable for large-scale industrial production

Method used

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  • Yield strength 890mpa grade high-strength high-toughness steel plate and production method thereof
  • Yield strength 890mpa grade high-strength high-toughness steel plate and production method thereof
  • Yield strength 890mpa grade high-strength high-toughness steel plate and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0073] The slab to be rolled after smelting and continuous casting is put into a heating furnace, the heating time is 260 minutes, and the soaking time is 40 minutes. The mass percentage of the chemical composition of the slab is: C0.13%, Si0.33%, Mn1.70%, P0.006%, S0.002%, Als0.024%, Nb0.048%, V0.063 %, Ti0.014%, Cr0.30%, Mo0.28%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 10 mm, the detailed rolling and heat treatment process is shown in Table 1, and its mechanical properties are shown in Table 2.

Embodiment 2

[0075] Put the slab to be rolled after smelting and continuous casting into the heating furnace, the heating time is 250 minutes, and the soaking time is 30 minutes. The mass percentage of the chemical composition of the slab is: C0.14%, Si0.28%, Mn1.65%, P0.012%, S0.003%, Als0.027%, Nb0.040%, V0.070 %, Ti0.012%, Cr0.28%, Mo0.25%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 16 mm, the detailed rolling and heat treatment process is shown in Table 1, and its mechanical properties are shown in Table 2.

Embodiment 3

[0077] The slab to be rolled after smelting and continuous casting is put into a heating furnace, the heating time is 300 minutes, and the soaking time is 45 minutes. The mass percentage of the chemical composition of the slab is: C0.15%, Si0.34%, Mn1.55%, P0.0015%, S0.003%, Als0.030%, Nb0.038%, V0.065 %, Ti0.015%, Cr0.20%, Mo0.22%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 20 mm, the detailed rolling and heat treatment process is shown in Table 1, and its mechanical properties are shown in Table 2.

[0078] like figure 1 Shown, be the metallographic photograph of embodiment 3 rolled state among the present invention; As figure 2 Shown, be the metallographic photograph of embodiment 3 quenched state among the present invention; As image 3 Shown is the metallographic photograph of embodiment 3 tempered state among the present invention.

[0079] from figure 1 It can be seen that the as-rolled structure of the steel plate ...

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Abstract

The invention discloses a high-strength high-toughness steel plate with yield strength 890Mpa grade, which comprises the following chemical components by weight: 0.13-0.18% of C, 0.25%-0.40% of Si, 1.40-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.030% of Als, 0.035-0.050% of NB, 0.050-0.070% of V, 0.010-0.015% of Ti, 0.15-0.30% of Cr, 0.20-0.30% of Mo and the balance of Fe and impurity. The invention also discloses a production method of the high-strength high-toughness steel plate with yield strength 890Mpa grade. The high-strength high-toughness steel plate with yield strength 890Mpa grade has excellent mechanical property, the yield strength of the steel plate in each embodiment is greater than 930 MPa, tensile strength is 980-1010 MPa, the elongation percentage is greater than 14.0%, and the impact energy of the steel plate can reach more than 100J under the temperature of -20 DEG C.

Description

technical field [0001] The invention relates to a medium-thick plate production technology, in particular to a high-strength and high-toughness steel plate with a yield strength of 890 MPa and a production method thereof. Background technique [0002] Low-alloy high-strength steel is widely used in various types of construction machinery. With the development of large-scale, high-efficiency, and lightweight construction machinery and equipment, high-strength construction machinery steel is widely used in construction machinery manufacturing. Steel for construction machinery needs to have high strength, good low temperature toughness, good fatigue resistance, good cold forming performance, good welding performance, etc. At present, high-strength and high-toughness steel plates with a yield strength of 890 MPa have been widely used. [0003] In the patent document of the Chinese patent application number "201310083414.0" titled "A High Yield Strength S89OQL Structural Steel P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/28C21D8/02
Inventor 刘泽田陆斌张大治李浩黄楠吴鹏飞岳祎楠高军华国龙王皓赵超孙长玉张晓燕惠鑫刘丹
Owner INNER MONGOLIA BAOTOU STEEL UNION