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Carbon structural steel controlled rolling and controlled cooling method

A carbon structural steel, controlled rolling and controlled cooling technology, applied in the direction of temperature control, metal rolling, etc., can solve the problems that cannot meet the hardness index of annealed materials, so as to save annealing costs and steel surface grinding costs, reduce production, The effect of meeting hardness requirements

Active Publication Date: 2020-10-13
建龙北满特殊钢有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the existing carbon structural steel hot-rolled products cannot meet the hardness index of annealed materials, the present invention provides a carbon structural steel controlled rolling and controlled cooling method

Method used

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  • Carbon structural steel controlled rolling and controlled cooling method
  • Carbon structural steel controlled rolling and controlled cooling method

Examples

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Effect test

Embodiment 1

[0021] The chemical composition of carbon structural steel in this embodiment includes: C0.05~0.52%, Si0.25~0.29%, Mn0.68~0.72%, P≤0.025%, S≤0.010%, Al0 .010~0.020%, the rest is Fe and unavoidable impurities.

[0022] The production process of carbon structural steel in this example is: electric furnace smelting + LF + VD → continuous casting billet → hot delivery or slow cooling → small bar rolling → slow cooling → straightening → flaw detection → inspection → delivery .

[0023] Carbon structural steel smelting process:

[0024] 1. In order to reduce the content of harmful elements as much as possible, the ingredients require pig iron or molten iron ≥ 20%,

[0025] 2. Smelting endpoint [C]≥0.20%, [P]≤0.018%.

[0026] 3. The deoxidizer in the LF refining process is aluminum particles, carbon powder, silicon carbide or ferrosilicon powder. After sampling 2, one-time aluminum supplementation is carried out according to the aluminum composition of sample 1 and the aluminum ta...

Embodiment 2

[0037] The chemical composition of carbon structural steel in this embodiment includes: C0.05~0.52%, Si0.25~0.29%, Mn0.68~0.72%, P≤0.025%, S≤0.010%, Al0 .010~0.020%, the rest is Fe and unavoidable impurities.

[0038] The production process of carbon structural steel in this example is: electric furnace smelting + LF + VD → continuous casting billet → hot delivery or slow cooling → small bar rolling → slow cooling → straightening → flaw detection → inspection → delivery .

[0039] Wherein the method for controlled rolling and controlled cooling in the rolling process that present embodiment provides is specifically:

[0040] Place the continuous casting slab with a size of 250mm×280mm in a heating furnace for heating, heat the continuous casting slab to 1120°C and keep it for 50 minutes in the first heating stage, continue heating to 1240°C and keep it for 60 minutes in the second heating stage, the temperature of the soaking section is 1230°C and hold for 70 minutes; the te...

Embodiment 3

[0044] The chemical composition of carbon structural steel in this embodiment includes: C0.05~0.52%, Si0.25~0.29%, Mn0.68~0.72%, P≤0.025%, S≤0.010%, Al0 .010~0.020%, the rest is Fe and unavoidable impurities.

[0045] The production process of carbon structural steel in this example is: electric furnace smelting + LF + VD → continuous casting billet → hot delivery or slow cooling → small bar rolling → slow cooling → straightening → flaw detection → inspection → delivery .

[0046] Wherein the method for controlled rolling and controlled cooling in the rolling process that present embodiment provides is specifically:

[0047] Place the continuous casting slab with a size of 250mm×280mm in the heating furnace for heating, heat the continuous casting slab to 1120°C and keep it for 50 minutes in the first heating stage, continue heating to 1180°C and keep it for 60 minutes in the second heating stage, the temperature of the soaking section is 1175°C and hold for 70 minutes; the te...

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Abstract

The invention relates to a carbon structural steel controlled rolling and controlled cooling method, and belongs to the technical field of steel rolling technologies. The problem that an existing carbon structural steel hot rolling material cannot meet the hardness index of annealing materials is solved. The carbon structural steel controlled rolling and controlled cooling method comprises the steps of heating of continuous casting, initial rolling, intensive pressure water cooling for the first time, finishing rolling, intensive pressure water cooling for the second time, cover buckling of acooling bed and slow cooling of lowering a pit. The intensive pressure water cooling for the first time controls the finishing rolling temperature at 850-880 DEG C; the intensive pressure water cooling for the second time controls the steel temperature on a cooling bed at 720-750 DEG C; and the cooling bed is provided with an insulation cover. According to the carbon structural steel controlled rolling and controlled cooling method, the hardness of the obtained carbon structural steel hot rolling materials reaches 194-199 HB, and the hardness requirement of the annealing materials is met. Through the accuracy control of the finishing rolling temperature and the cooling bed cooling rate, the generation of oxidized scales can further be reduced, the annealing cost and the coping cost of thesurfaces of the steel materials are saved, and the cost decreasing and benefit increasing are realized.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a controlled rolling and controlled cooling method for carbon structural steel. Background technique [0002] Carbon structural steel is a kind of carbon steel, which is mainly used in railways, bridges, various construction projects, and the manufacture of various metal components that bear static loads. In the rolling process of carbon structural steel, the hardness of the hot-rolled material often cannot meet the hardness index of the annealed material. At the same time, since the steel rolling process cannot be carried out under full vacuum conditions, iron oxide scales will be produced on the surface of the steel material in an oxidizing atmosphere within the hot rolling temperature range. Whether it is a profile, bar or plate, the surface will be covered by iron oxide scale during the hot rolling forming process. Although there is high-pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/74C22C38/02C22C38/04C22C38/06
CPCB21B1/22B21B37/74C22C38/02C22C38/04C22C38/002C22C38/06B21B2001/225
Inventor 马天超陈列董贵文刘光辉张立明李艾李庆斌
Owner 建龙北满特殊钢有限责任公司
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