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DQ-Q&T method for 1000MPa grade steel plate with thickness less than 80mm

A technology of DQ-Q&T and steel plates for hydropower, which is applied in the field of DQ-Q&T, can solve the problems that the steel plates for hydropower cannot reach the tensile strength, and achieve the effect of excellent plasticity and low-temperature impact toughness

Active Publication Date: 2018-06-22
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the steel plate for hydroelectricity not greater than 80 mm thick produced by the above-mentioned patented method cannot meet the requirement of a tensile strength of 1000 MPa.

Method used

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  • DQ-Q&T method for 1000MPa grade steel plate with thickness less than 80mm
  • DQ-Q&T method for 1000MPa grade steel plate with thickness less than 80mm
  • DQ-Q&T method for 1000MPa grade steel plate with thickness less than 80mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Smelt molten steel according to the set composition and continuously cast it into slab, its composition by weight percentage is C 0.13%, Mn 1.2%, P 0.008%, S 0.001%, Si 0.3%, Ni 1.4%, Cr 0.35%, Alt 0.04% , Nb 0.015%, Mo0.4%, V 0.035%, Ti 0.016%, B 0.0015%, and the balance is Fe. Casting into a continuous casting slab with a thickness of 320mm, the slab has been inspected, stacked for 48 hours, and the surface of the slab has been inspected. The surface quality of the slab is good, and there is no need to grind the slab.

[0030] The slab is heated by a walking heating furnace, the first stage is heated to 700°C, the second stage is heated to 1110°C, the third stage is heated to 1200°C, the soaking time of the third heating stage is 70min, and the total heating time is 330min. Before the slab is hot-rolled, it is dephosphorized by high-pressure water to remove the iron oxide scale on the surface of the slab. The slab is rolled in two stages by using a 4700mm four-roll m...

Embodiment 2

[0035] Smelt molten steel according to the set composition and continuously cast it into slab, its composition by weight percentage is C 0.13%, Mn 1.2%, P 0.008%, S 0.001%, Si 0.3%, Ni 1.4%, Cr 0.35%, Alt 0.04% , Nb 0.015%, Mo0.4%, V 0.035%, Ti 0.016%, B 0.0015%, and the balance is Fe. Casting into a continuous casting slab with a thickness of 320mm, the slab has been inspected, stacked for 48 hours, and the surface of the slab has been inspected. The surface quality of the slab is good, and there is no need to grind the slab.

[0036] The slab is heated by a walking heating furnace, the first stage is heated to 710°C, the second stage is heated to 1100°C, the third stage is heated to 1200°C, the soaking time of the third heating stage is 60min, and the total heating time is 330min. The slab is rolled in two stages by using a 4700mm four-roll mill. The rough rolling pass is 5 passes, the starting rolling temperature is 1150°C, the final rolling temperature is 1055°C, the total...

Embodiment 3

[0041] Smelt molten steel according to the set composition and continuously cast it into slab, its composition by weight percentage is C 0.13%, Mn 1.2%, P 0.008%, S 0.001%, Si 0.3%, Ni 1.4%, Cr 0.35%, Alt 0.04% , Nb 0.015%, Mo0.4%, V 0.035%, Ti 0.016%, B 0.0015%, and the balance is Fe. Casting into a continuous casting slab with a thickness of 320mm, the slab has been inspected, stacked for 48 hours, and the surface of the slab has been inspected. The surface quality of the slab is good, and there is no need to grind the slab.

[0042] The slab is heated by a walking heating furnace, the first stage is heated to 710°C, the second stage is heated to 1110°C, the third stage is heated to 1220°C, the soaking time of the third heating stage is 70min, and the total heating time is 340min. The slab is rolled in two stages by using a 4700mm four-roll mill. The rough rolling pass is 5 passes, the starting rolling temperature is 1150°C, the final rolling temperature is 1055°C, the total...

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Abstract

The invention provides a DQ-Q&T method for 1000MPa grade steel plate with thickness less than 80mm. The steel plate comprises the chemical composition of, by weight, 0.10-0.1 9% of C, 0.15-0.50% of Si, no more than 1.45% of Mn, no more than 0.01% of P, no more than 0.002% of S, no more than 3.00% of Ni, 0.30-0.65% of Cr, no more than 0.20% of Cu, no more than 0.10% of Alt, no more than 0.08% of Nb, 0.35-0.55% of Mo, no more than 0.12% of V, no more than 0.06% of Ti, no more than 0.003% of B and the balance Fe. A 1000MPa-grade quenching and tempering steel plate for hydropower with excellent strength, plasticity and low temperature impact toughness can be obtained by the reasonable design of chemical composition matching with corresponding cooling and quenching and tempering process.

Description

technical field [0001] The invention belongs to the technical field of steel used in hydropower stations, and in particular relates to a DQ-Q&T method for a 1000MPa grade steel plate not larger than 80mm in thickness. Background technique [0002] At present, the tensile strength of steel plates for hydropower is developing towards the direction of 1000MPa. Usually, the thickness specification of the steel plate for hydropower is 10-100 mm. With the increase of thickness specifications, the microstructure and mechanical properties of the steel plate are difficult to control and guarantee. Therefore, it is necessary to ensure mechanical performance indicators such as strength and impact energy from the aspects of composition design and process path control for different thickness specifications. [0003] The patent application number 201410753679.1 proposes a quenched and tempered steel plate for hydropower and its preparation method, which can produce steel plates with a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C21D1/25C21D8/02
CPCC21D1/25C21D8/0226C21D2211/00C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 李长生陈洁金鑫王煜陈礼清
Owner NORTHEASTERN UNIV
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