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Straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method

A low-alloy steel and slab continuous casting technology, which is applied in the field of metal continuous casting slab cooling and surface quality control, can solve the problems such as the inability to completely eliminate corner transverse crack defects, eliminate corner transverse crack defects, and improve cooling uniformity. The effect of good ductility and plasticity

Inactive Publication Date: 2008-03-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the continuous casting slab of the existing straight arc type casting machine cannot completely eliminate the defect of the transverse crack at the corner, the technical problem to be solved by the present invention is to provide a straight arc type casting machine low alloy steel slab continuously cast with a narrow foot roll section. Surface cooling method, which can effectively eliminate the generation of transverse crack defects at the corners of low-alloy steel slabs

Method used

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  • Straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method
  • Straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method
  • Straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method

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Embodiment 1

[0027] A converter steelmaking plant adopts the technology of the present invention to control the transverse crack defect at the corner of the P510L steel billet for automobile beam plate. The chemical composition of P510L steel except Fe and a small amount of impurities is shown in Table 1. In continuous casting production, the nozzle structure shown in Figure 1 is used, which is composed of three parts: nozzle 2, coupling screw 1 and coupling nut 3, and the nozzle is designed according to the nozzle pressure-flow characteristics shown in Table 2. The foot roller section is narrow See Figure 2 and Figure 3 for the schematic diagrams of the layout of the surface nozzles along the longitudinal and transverse directions. Before casting, the width of the slab is set to 1050mm, the thickness of the slab is set to 200mm, the casting speed of the casting machine is 1.40m / min during continuous casting, and the water volume of the narrow surface of the foot roll section is set to 67....

Embodiment 2

[0033]A converter steelmaking plant adopts the technology of the present invention to control the transverse crack defect at the corner of the P510L steel billet for automobile beam plate. The chemical composition of P510L steel except Fe and a small amount of impurities is shown in Table 1. During continuous casting production, the same nozzles as in Example 1 are used, and the layout schematic diagrams of the narrow surface nozzles of the foot roll section along the longitudinal and transverse directions are shown in Figure 2 and Figure 3 . Before casting, the width of the slab is set to 1300mm, the thickness of the slab is set to 200mm, the casting speed of the casting machine is 0.80m / min during continuous casting, and the water volume of the narrow surface of the foot roll section is set to 45.2L / min. After the casting is completed, the surface inspection and low-magnification inspection of the produced slab are carried out. The inspection shows that the depth of the vibr...

Embodiment 3

[0035] A converter steelmaking plant adopts the technology of the present invention to control the transverse crack defect at the corner of the P590L steel billet for automobile beam plate. The chemical composition of P590L steel except Fe and a small amount of impurities is shown in Table 3. During continuous casting production, the same nozzles as in Example 1 are used, and the layout schematic diagrams of the narrow surface nozzles of the foot roll section along the longitudinal and transverse directions are shown in Figure 2 and Figure 3 . Before casting, the width of the slab is set to 1100mm, the thickness of the slab is set to 200mm, the casting speed of the casting machine is 1.20m / min during continuous casting, and the water volume of the narrow surface of the foot roll section is set to 59.8L / min. After the casting is completed, the surface inspection and low-magnification inspection of the produced slab are carried out. The inspection shows that the depth of the vib...

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Abstract

The present invention discloses a straight-curved type casting machine low-alloy steel slab continuous casting full-rolling section narrow face cooling method, and is aimed at solving the problem of that on the casting blank surface corner portion of low-alloy steel the transverse crack can be easily produced. Said invention belongs to the field of metal continuous casting blank cooling and surface quality control technology. Said method is characterized by that in the full-rolling section of continuous casting straight-curved type casting machine slab said invention utilizes the nozzles which are symmetrically mounted at left side and right side of casting blank pouring direction to cool the narrow face of said casting blank, and adopts rectangular nozzles to symmetrically and simultaneously cool the narrow faces of left and right two sides of casting blank. Said invention also discloses a kind of rectangular nozzle for said method, the water outlet hole of its sprayer is a hole with rectangular section. Said invention can reduce casting blank cooling strength of full-rolling section under the crystallizer and can improve casting blank cooling uniformity, so that it can eliminate casting blank surface corner portion transverse crack defect of continuously-cast high-strength low-alloy steel whose steel quality is P510L, P590L, J55 and X52, etc.

Description

technical field [0001] The invention relates to the technical field of metal continuous casting slab cooling and surface quality control, in particular to a metal continuous casting slab cooling method for eliminating transverse crack defects at corners of low alloy steel casting slabs. Background technique [0002] At present, vanadium-containing microalloyed steels are highly sensitive to cracks. In the process of continuous casting, because V in solid solution at high temperature is dynamically precipitated or statically precipitated at the austenite grain boundary in the form of V(CN) when the temperature is lowered, the crack sensitivity is increased. Especially for straight-arc caster slab casters, the slab is subjected to compressive stress and tensile stress on the inner and outer arc sides of the slab in the bending area, while in the straightening area, the inner and outer arc sides of the slab are subjected to compressive stress and tensile stress respectively. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/22
Inventor 陈永赵代琼吴国荣曾建华杨素波
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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