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Technique for manufacturing 150-400mm thick carbon constructional steel plate by using continuous casting slabs

A carbon structure and slab technology, applied in the field of metal materials, can solve the problems of low production efficiency, low yield, and high energy consumption, and achieve the effects of high production efficiency, low cost, and increased heat preservation time

Inactive Publication Date: 2012-11-07
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the thickness of the continuous casting slab, domestic production of steel plates with flaw detection and performance protection by continuous casting slabs is generally up to 150 mm thick, and steel plates above 150 mm generally adopt the form of die-casting steel ingots, electroslag ingots, etc. The production process has low yield and energy consumption. High, low production efficiency and other shortcomings

Method used

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  • Technique for manufacturing 150-400mm thick carbon constructional steel plate by using continuous casting slabs
  • Technique for manufacturing 150-400mm thick carbon constructional steel plate by using continuous casting slabs

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: Production of 200mm thick Q235B steel plate:

[0032] 1) High-purity molten steel is smelted. After the molten steel is smelted in a converter, LF+RH double refining is carried out. LF refining fully removes inclusions and desulfurization. RH vacuum treatment maintains a vacuum degree of 100Pa for 14 minutes. After refining, the gas in the molten steel [O] 13ppm, [H]2ppm.

[0033] 2) The continuous casting process of molten steel adopts full protection pouring, and uses electromagnetic stirring, pouring at a constant speed to produce continuous casting slabs with a thickness of 250mm and the same fixed length. The analysis results of the melting composition are as follows:

[0034] Table 1 Example 1 Continuous Casting Slab Chemical Composition

[0035] chemical composition C Si mn P S Contentwt% 0.20 0.25 1.10 0.016 0.004

[0036] 3) The two 250mm thick continuous casting slabs produced are processed by milling machine to r...

Embodiment 2

[0047] Embodiment 2: Production of 200mm thick Q235B steel plate:

[0048] 1) High-purity molten steel is smelted. After the molten steel is smelted in a converter, LF+RH double refining is carried out. LF refining fully removes inclusions and desulfurization. RH vacuum treatment maintains a vacuum degree of 100Pa for 16 minutes. After refining, the gas in the molten steel [O] 12ppm, [H]2.1ppm.

[0049] 2) The continuous casting process of molten steel adopts full protection pouring, and uses electromagnetic stirring, pouring at a constant speed to produce continuous casting slabs with a thickness of 250mm and the same fixed length. The analysis results of the melting composition are shown in Table 2:

[0050] Table 2 Example 2 Continuous Casting Slab Chemical Composition

[0051] chemical composition C Si mn P S Contentwt% 0.18 0.30 1.15 0.010 0.008

[0052] 3) The two 250mm thick continuous casting slabs produced are processed by milling mach...

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Abstract

The invention discloses a technique for manufacturing a 150-400mm thick carbon constructional steel plate by using continuous casting slabs, belonging to the field of metal materials. The continuous casting slabs subjected to converter steelmaking and secondary refining are used in the technique; and the chemical components of the slabs include 0.14-0.20wt% of C, 0.20-0.50wt% of Si, 0.08-1.40wt% of Mn and less than or equal to 0.010wt% of S; at least two continuous casting slabs subjected to surface machining and cleaning are overlapped, four sides of the continuous casting slabs are combined and welded to form a big-thickness blank, the blank is arranged in a bogie-type furnace or a soaking pit furnace for heating, and then is rolled, water-cooled and subjected to heat treatment after being discharged from the furnace so as to produce the 120-400mm thick carbon constructional steel plate. The technique has the following characteristics of simple production process, high yield, high ultrasonic flaw detection rate of more than 98% and excellent performance.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to a process for manufacturing 150-400mm thick carbon structural steel plates by using continuous casting slabs. Background technique [0002] 150-400mm thick carbon structural steel plates are widely used in national economic fields such as heavy machinery manufacturing and structural processing. The product requires good ductility and internal quality. Restricted by the thickness of the continuous casting billet, domestic steel plates with flaw detection and performance protection are generally produced with a maximum thickness of 150mm. Steel plates above 150mm generally adopt the form of die-casting steel ingots and electroslag ingots. The production process has low yield and energy consumption. High, low production efficiency and other shortcomings. Contents of the invention [0003] The invention breaks through the limitation of the thickness of the continuous casting slab, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 崔健赵乾马兴云孙卫华王绍禄
Owner JIGANG GRP
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