Production method of medium-low carbon high-strength steel homogenized casting blank

A production method and technology for high-strength steel, applied in the field of casting, can solve the problems of high requirements for stable operation of steelmaking and continuous casting, difficult to control the uniformity of the cast slab structure, and complicated control models, so as to improve the HIC inspection pass rate, eliminate the Axial/Central Segregation and Internal Cracks, Simple Process Effect

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 Improve s

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-low carbon high-strength steel. The production method described in this embodiment is to cast a continuous casting slab of S355 steel with a cross-section of 250mm×1850mm on a straight-curved mold double-strand slab continuous casting machine. Known: Tundish temperature T tundish 1530.3~1539.8℃; the casting speed V of the continuous casting machine casting The chemical composition and mass percentage (wt%) of the cast S355 steel are shown in Table 1:

[0024] Table 1

[0025] C

Si

mn

Ni

Cu

V

Mo

Cr

S

P

0.16～0.19

0.25～0.3

1.2～1.4

0.03

0

0

0

0.03

0～0.003

0～0.01

[0026] According to the chemical composition of the steel grades shown in Table 1 and their mass percentages (wt%), the liquidus temperature T of the cast S355 steel liqudus =1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1510.3~1514.8°...

Embodiment 2

[0040] The invention discloses a method for producing a homogeneous cast slab of medium-low carbon high-strength steel. The production method described in this embodiment is to cast the pipeline steel Х65 continuous casting slab with a cross-section of 300mm×2000mm on a straight-curved mold double-strand slab continuous casting machine. Known: Tundish temperature T tundish 1538~1547℃; the casting speed V of the continuous casting machine casting The chemical composition and mass percentage (wt%) of the cast Х65 continuous casting billet are shown in Table 2:

[0041] Table 2

[0042] C

Si

mn

Ni

Cu

V

Mo

Cr

S

P

0.08～0.1

0.25～0.35

1.2～1.4

0

0

0.03～0.04

0

0

0～0.002

0～0.01

[0043] According to its mass percentage (wt%) of the chemical composition of the steel grade shown in Table 2, the liquidus temperature T of the cast X65 continuous casting slab liqudus =1537-(88C+8Si+5Mn+4Ni+5Cu+...

Embodiment 3

[0057] The invention discloses a method for producing a homogeneous cast slab of medium-low carbon high-strength steel. The production method described in this embodiment is to cast a Q235B 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 1531.9~1543.8℃; the casting speed V of the continuous casting machine casting The chemical composition and mass percentage (wt%) of the cast Q235B steel are shown in Table 3:

[0058] table 3

[0059] C

Si

mn

Ni

Cu

V

Mo

Cr

S

P

0.15～0.2

0.25～0.35

0.6～0.8

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 Q235B steel liqudus =1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1511.9-1518...

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Abstract

The invention relates to a production method of a medium-low carbon high-strength steel homogenized casting blank. The invention adopts the technical scheme as follows: the production method comprises the following step: feeding a cold steel belt into medium-low carbon high-strength molten steel inside a continuous casting machine crystallizer or an ingot mold, wherein the cold steel belt accounts for 0.3-1.0% of the medium-low carbon high-strength molten steel by weight; the cold steel belt feeding speed Vband is equal to A*Vcasting*(Ttundish-Tliqudus)/Tliquidus; the vibration frequency of a belt feeder is 50-35000 Hz; the cold steel belt comprises 0.2-0.65% of C or 1-3% of silicon by weight; the melting point of the cold steel belt is 3-30 DEG C lower than that of the cast casting blank; the surface of the cold steel belt is coated with anti-rusting oil; the thickness of the cold steel belt is 1-6 mm. The production method disclosed by the invention is simple in process, low in cost and convenient to operate; the macrostructure of the produced medium-low carbon high-strength steel homogenized casting blank is obviously improved, the axial/center segregation and internal cracks caused by chemical elements are obviously weakened or eliminated, the ductility and the toughness of the rolled steel plate are improved, the HIC detection qualification rate of the engineering structure steel and the corrosion-resisting steel is increased.

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-low carbon 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 and c...

Claims

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Application Information

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IPC IPC(8): B22D11/116
CPCB22D11/116
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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