F+P+B type low-yield-ratio and high-strength medium steel plate and production method thereof

A technology with low yield ratio and production method, applied in the field of high-strength medium and heavy plate steel, can solve the problems of increased production cycle, high alloy cost and high process cost, and achieve short production cycle, low alloy cost and social resource saving. Effect

Inactive Publication Date: 2013-04-03
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Prior to the present invention, patent number: 201010599469 A kind of 800Mpa low yield ratio structural steel plate and its production method, using TMCP process and tempering heat treatment, the thickness specification of the steel plate is 10-40mm, yield strength ≥ 550Mpa, tensile strength ≥ 800Mpa, yield strength ratio<0.70, the disadvantage is that the steel uses Nb, V, Ti microalloying elements and high noble metal elements Ni, Mo and Cu are added at the same time, the alloy cost is high; the process adopts post-rolling tempering treatment , the process cost is also high
The disadvantage is that the steel uses Nb and Ti microalloying elements while adding higher noble metal elements Ni, which leads to high alloy cost;

Method used

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  • F+P+B type low-yield-ratio and high-strength medium steel plate and production method thereof
  • F+P+B type low-yield-ratio and high-strength medium steel plate and production method thereof
  • F+P+B type low-yield-ratio and high-strength medium steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This implementation is the production process of F+P+B type low-yield ratio high-strength steel plate with a specification of 16mm, and its composition weight percentage is C: 0.09%, Si: 0.3%, Mn: 1.95%, P: 0.009%, S: 0.006%, Al: 0.03%, Nb: 0.055%, Ti: 0.015%, V: 0.06%, Cr: 0.15%, B: 0.0015%, and the balance is Fe and unavoidable inclusions.

[0033] The production process is carried out according to the following procedures:

[0034] (1) Smelting: Smelting in a 50kg vacuum induction furnace and casting into ingots of 120mm*120mm*300mm.

[0035] (2) Controlled rolling, waiting temperature and ultra-fast controlled cooling parameters:

[0036] Heating temperature: The billet heating temperature in this test is set at 1180°C, and the heating time is 4 hours.

[0037]Controlled rolling: Two-stage controlled rolling is adopted. The starting rolling temperature in the rough rolling stage is 1160°C, and the pass reduction rate is 25%; the thickness of the rolled piece to b...

Embodiment 2

[0040] This example is a production process of F+P+B type low-yield-ratio high-strength steel plate with a specification of 40mm, and its composition weight percentage is C: 0.10%, Si: 0.28%, Mn: 1.97%, P: 0.01%, S : 0.006%, Al: 0.03%, Nb: 0.06%, Ti: 0.014%, V: 0.055%, Cr: 0.16%, B: 0.0016%, and the balance is Fe and unavoidable inclusions.

[0041] The production process is carried out according to the following procedures:

[0042] (1) Smelting: Smelting in a 50kg vacuum induction furnace and casting into ingots of 120mm*120mm*300mm.

[0043] (2) Controlled rolling, waiting temperature and ultra-fast controlled cooling parameters:

[0044] Heating temperature: The billet heating temperature in this test is set at 1180°C, and the heating time is 4 hours.

[0045] Controlled rolling: Two-stage controlled rolling is adopted. The starting rolling temperature in the rough rolling stage is 1160°C, and the pass reduction rate is 20%; the thickness to be warmed in the middle of t...

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PUM

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Abstract

The invention discloses an F+P+B type low-yield-ratio high-strength medium steel plate and a production method thereof, and belongs to the technical field of high-strength medium steel plates. The steel plate comprises the following chemical compositions by weight percentage: 0.05-0.12% of C, 0.2-0.4% of Si, 1.7-2.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.02-0.05% of Al, 0.04-0.09% of Nb, 0.01-0.02% of Ti, 0.03-0.07% of V, 0.1-0.2% of Cr, 0.001-0.002% of B, and the balance of Fe and unavoidable impurities. The steel plate adopts a smelting, controlled rolling and mild ultra-fast cooling technology system, and has the advantages that precious metal elements such as Ni, Mo or Cu are not adopted, so that the alloy cost is low; thermal treatment techniques such as quenching or tempering are not adopted, so that the production cost is low; the production period is short; high-toughness, low-yield-ratio and high-strength steel can be produced stably; and the steel plate is applicable to fields of engineering machinery, coal machine industry and the like.

Description

technical field [0001] The invention belongs to the technical field of high-strength medium-thick plate steel, and in particular relates to an F (ferrite)+P (pearlite)+B (bainite) type low yield ratio high-strength medium-thick steel plate and a production method thereof. Background technique [0002] With the development of large-scale and light-weight construction machinery, steel plates used in steel structures must have high strength, good elongation performance, cold bending performance, welding performance and impact resistance. However, when the structural strength level is increased, the risk of brittle fracture of the structure increases, and the requirements for ductility-plasticity and yield-strength ratio are also more stringent, especially the yield-strength ratio. Yield strength ratio is a parameter that characterizes the overall uniform plastic deformation ability of materials due to overload. A lower yield strength ratio means that the steel plate has a highe...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C33/04C21D8/02
Inventor 张苏渊邹扬朱振华刘春明姜中行麻庆申王海宝王卫华
Owner SHOUGANG CORPORATION
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