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Production method of structural-level galvanized steel strip with yield strength not lower than 450 MPa

A technology of galvanized steel strip and yield strength, applied in the manufacture of converters, etc., can solve many problems, such as slag removal, ash removal, temperature and time control, slag removal, workpiece hoisting, uneven surface state of the zinc layer, Operator bodily injury and other problems, to achieve the effect of high quality, good surface quality and stable product quality

Inactive Publication Date: 2016-11-09
TANGSHAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of processing process is long and complicated, and there are many links that limit the quality of the product. For example, when the steel structure is rolled, the surface oxide scale may enter the steel base, forming uneven pits in the subsequent pickling process, and finally resulting in uneven coating; For example, the solvent-treated components must be dried in a timely and complete manner, otherwise not only the surface quality is poor but also the danger of explosion may be caused; in addition, the solvent method is used in the galvanizing of the components, and the degree of automation is not high, and there are many factors affecting artificial action, such as slag removal and ash removal , temperature and time control, slag removal, workpiece hoisting, etc., all affect the surface state of the zinc layer unevenly, and the plating solution and acid solution in the galvanizing process of structural parts contain toxic and harmful substances, which may cause bodily harm to operators Dangerous and heavily polluted environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the present embodiment, the specification of the galvanized steel strip of production is 3.5 * 1200mm, and its production technology is carried out according to the following steps:

[0041](1) Converter smelting: mass percentage of molten steel controlled at the end of converter smelting: C: 0.08%, Si: 0.03%, Mn: 0.78%, P: 0.016%, S: 0.005%, Cr: 0.02%, Mo: 0.0006%, V : 0.001%, Nb: 0.025%, Ti: 0.015%, Ni: 0.0062%, Cu: 0.013%, Cev: 0.21%; the end point temperature is 1670°C, the end point oxygen position is 600ppm, and the tapping time is 5 minutes; deoxidation alloying process Start feeding when 1 / 3 of the molten steel is tapped, and finish before 2 / 3 of the tapping, the feeding sequence is: lime → aluminum manganese titanium or aluminum iron → medium carbon ferromanganese → ferroniobium, the amount of lime added is 3.5 kg / ton of steel; The slag blocking machine is used to block slag, the thickness of the lower slag is 40mm, and the final slag alkalinity is 2.4.

[...

Embodiment 2

[0049] In the present embodiment, the specification of the galvanized steel strip of production is 2.7 * 1000mm, and its production technology is carried out according to the following steps:

[0050] (1) Converter smelting: mass percentage of molten steel at the end of converter: C: 0.07%, Si: 0.01%, Mn: 0.73%, P: 0.014%, S: 0.007%, Cr: 0.018%, Mo: 0.001%, V: 0.005%, Nb: 0.021%, Ti: 0.012%, Ni: 0.016%, Cu: 0.005%, Cev: 0.20%; end point temperature 1650°C, end point oxygen position 700ppm, tapping time 5 minutes; deoxidation alloying process tapping The feeding starts at 1 / 3 of the molten steel and finishes before 2 / 3 of the steel is tapped. The feeding sequence is: lime → aluminum manganese titanium or aluminum iron → medium carbon ferromanganese → ferroniobium, the amount of lime added is 3.5 kg / ton of steel; slag is used Machine block slag, slag thickness 38mm, final slag basicity 2.6.

[0051] (2) LF refining: the entry temperature is 1580°C, the exit temperature is 1610°...

Embodiment 3

[0058] In the present embodiment, the specification of the galvanized steel strip of production is 3.0 * 1200mm, and its production technology is carried out according to the following steps:

[0059] (1) Converter smelting: mass percentage of molten steel at the end of converter: C: 0.09%, Si: 0.02%, Mn: 0.70%, P: 0.017%, S: 0.005%, Cr: 0.056%, Mo: 0.0013%, V: 0.004%, Nb: 0.030%, Ti: 0.025%, Ni: 0.005%, Cu: 0.006%, Cev: 0.19%; end point temperature 1650°C, end point oxygen position 800ppm, tapping time 6 minutes; deoxidation alloying process tapping The feeding starts at 1 / 3 of the molten steel and finishes before 2 / 3 of the steel is tapped. The feeding sequence is: lime → aluminum manganese titanium or aluminum iron → medium carbon ferromanganese → ferroniobium, the amount of lime added is 4 kg / ton of steel; slag is used Machine block slag, slag thickness 32mm, final slag basicity 2.8.

[0060] (2) LF refining: the entry temperature is 1580°C, the exit temperature is 1600°C...

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Abstract

The invention discloses a production method of a structural-level galvanized steel strip with the yield strength not lower than 450 MPa, and belongs to the technical field of production of galvanized steel strips. The production method comprises the steps of (1) converter smelting; (2) LF refining; (3) plate blank continuous casting; (4) hot rolling; (5) acid washing; and (6) continuous galvanization: the temperature of strip steel at a direct combustion section of an annealing furnace is 560-760 DEG C; the strip steel is heated by a heating section of a radiation pipe through full power; the temperature of the strip steel entering a zinc pot is 450-490 DEG C; and the temperature of zinc pot liquid is 450-470 DEG C. The production method adopts a continuous galvanization production process to produce a high-ductility structural-level galvanized steel strip with the yield strength not lower than 450 MPa, satisfies the production requirements through controlling the process parameters in all procedures, is precise in smelting components, has no defects in continuous-cast blanks, is excellent in quality of hot-rolled wound plates, is excellent in surfaces of acid-washed steel strips, and finally produces high-quality galvanized steel strips.

Description

technical field [0001] The invention relates to a production method of a structural-grade galvanized steel strip with yield strength ≥ 450 MPa, belonging to the technical field of galvanized steel strip production. Background technique [0002] Structural-grade galvanized steel strip has high strength and corrosion resistance, and is widely used in construction, home appliances, equipment manufacturing, automobiles and other industries. Generally, the strength level of structural-grade galvanized steel strip products increases, and the elongation rate will decrease accordingly. With the continuous development of industries in various application fields, the requirements for raw materials are getting higher and higher, not only requiring high strength, but also requiring complex deformation capabilities. The galvanized sheet that can meet the elongation and deformation requirements of the same level cannot meet its use requirements after processing. For example, after the ho...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/18C22C38/08C22C38/16C21C5/30C21C7/064
CPCC22C38/04C21C5/30C21C7/064C22C38/005C22C38/02C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 王力达梅淑文张斌孙璐汪云辉耿伟王海龙张星王淑华李秀景魏升辉
Owner TANGSHAN IRON & STEEL GROUP
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