Production method for medium-high carbon high-strength steel homogenized casting blank

A production method and technology of high-strength steel, applied in the field of casting, can solve problems such as high requirements for stable operation of steelmaking and continuous casting, difficulty in controlling the uniformity of billet structure, and complex control models, so as to improve the pass rate of HIC detection and eliminate Effect of axial/central segregation and internal cracks, simple process

Active Publication Date: 2015-04-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the traditional die casting process, the continuous casting process is a major technological advancement, but inherent product defects such as low equiaxed grain rate, center segregation, center looseness and center cracks restrict the quality of continuous casting products
For example, "A Control Method for Light Reduction Position of Slab Continuous Casting" (CN200510028601.4) and "Electromagnetic Stirring Technology for Horizontal Continuous Casting" (CN200510032537.7) can partially Improv...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The invention discloses a method for producing a homogeneous cast slab of medium-high carbon and high-strength steel. The production method described in this embodiment is to cast a 45# steel continuous casting slab with a cross-section of 250mm×1850mm on a straight-curved mold double-strand slab continuous casting machine. Known: Tundish temperature T tundish 1500.4~1516.7℃; the casting speed V of the continuous casting machine casting The chemical composition and mass percentage (wt%) of the cast 45# steel are shown in Table 1:

[0024] Table 1

[0025] C

Si

mn

Ni

Cu

V

Mo

Cr

S

P

0.4～0.5

0.25～0.3

0.6～0.8

0.01

0.01

0

0

0.01

0～0.01

0～0.015

[0026] According to the chemical composition and mass percentage (wt%) of the steel grades shown in Table 1, the liquidus temperature T of the cast 45# steel liqudus =1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1485.4~1496.7°C.

[...

Embodiment 2

[0040] The invention discloses a method for producing a homogeneous cast slab of medium-high carbon and high-strength steel. The production method described in this embodiment is to cast a 50# continuous casting slab with a cross section of 300mm×2000mm on a single-strand slab continuous casting machine with a straight curved mold. Known: Tundish temperature T tundish It is 1498.7~1510.6℃; the casting speed V of the continuous casting machine casting The chemical composition and mass percentage (wt%) of the cast 50# continuous casting slab are shown in Table 2:

[0041] Table 2

[0042] C

Si

mn

Ni

Cu

V

Mo

Cr

S

P

0.47～0.52

0.25～0.3

0.6～0.8

0

0

0

0

0

0～0.01

0～0.015

[0043] According to the chemical composition and mass percentage (wt%) of the steel grade shown in Table 2, the liquidus temperature T of the cast 50# continuous casting slab liqudus =1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1...

Embodiment 3

[0057] The invention discloses a method for producing a homogeneous cast slab of medium-high carbon and high-strength steel. The production method described in this embodiment is to cast a 65Mn steel continuous casting slab with a cross section of 300mm×400mm on a single-strand rectangular slab continuous casting machine with a full arc mold. Known: Tundish temperature T tundish It is 1480.5~1497.2℃; the casting speed V of the continuous casting machine casting The chemical composition and mass percentage (wt%) of the cast 65Mn steel are shown in Table 3:

[0058] table 3

[0059] C

Si

mn

Ni

Cu

V

Mo

Cr

S

P

0.6～0.7

0.25～0.4

1～1.2

0

0

0

0

0

0～0.01

0～0.015

[0060] According to the chemical composition and mass percentage (wt%) of the steel grade shown in Table 3, the liquidus temperature T of the cast 65Mn steel liqudus =1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1465.5-1477.2...

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PUM

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Abstract

The invention relates to a production method for a medium-high carbon high-strength steel homogenized casting blank. The invention adopts the technical scheme that the production method comprises the step that a compound filler cored wire is fed into medium-high carbon high-strength molten steel in a continuous casting crystallizer or an ingot mold, wherein the fed compound filler cored wire accounts for 0.3 to 1.2 percent by weight of the medium-high carbon high-strength molten steel, the feeding speed Vband of the compound-filled cored wire is equal to A*Vcasting*(Ttundish -Tliqudus)/Tliqudus, and the vibrating frequency of a band feeding machine is 50-35,000 Hz; the compound filler cored wire is a mixture of passivated iron sand and a high-melting-point carbonitride, the carbonitride accounts for 1-10 percent by weight of the compound filler cored wire, and the high-melting-point carbonitride is a carbonitride formed by Zr and/or Nb. The production method provided by the invention is simple in process, low in cost and convenient to operate; the macrostructure of the produced medium-high carbon high-strength steel homogenized casting blank is obviously improved, and axial/central segregation and internal cracks caused by chemical elements are remarkably reduced or eliminated, so that the plasticity and toughness of a rolled steel plate are improved.

Description

technical field [0001] The invention belongs to the technical field of casting. In particular, it relates to a method for producing a homogeneous cast slab of medium-high carbon and high-strength steel. Background technique [0002] Mold and ingot mold are very critical "heart" parts in casting. The solidification process of molten steel in mold and ingot mold has a decisive impact on the surface quality and internal quality of the billet. Axial / central segregation of cast slabs and blooms has a significant effect on the quality of the finished steel. The ever-increasing demand for high-quality steel makes technicians face the problem of how to reduce the axial / central segregation of continuous casting billets and blooms, and produce high-quality continuous casting billets and blooms that meet high requirements. Continuous casting billets are formed under highly extended liquid phase conditions up to tens of meters, which can seriously affect the development of structural ...

Claims

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Application Information

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IPC IPC(8): B22D11/116
CPCB22D11/001B22D11/108
Inventor 伊萨耶夫·欧列格吴开明格热斯·奥列格山大张聪
Owner WUHAN UNIV OF SCI & TECH
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