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Low-cost aging resistant household appliance color coated sheet and production method thereof

A time-resistant and low-cost technology, which is applied in the field of iron and steel smelting, can solve the problems of low strength and hardness of steel base, easy and easy scrapping of refrigerator outer panels, etc., achieve good stamping performance, strong time resistance, and increase the yield of finished products Effect

Inactive Publication Date: 2014-01-08
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention does not take into account the influence of artificial aging on the hot-dip galvanized sheet during the production process of color coating, which makes the outer panel of the refrigerator prone to tensile strain lines and is easily scrapped
Baosteel invented a color-coated steel sheet / strip with anti-baking aging and its manufacturing method (patent application number is 200910045844.7), and its composition mass percentage content (wt%) is C: ≤0.003, Si: 0.15~0.25, Mn: 0.5~0.8, P: 0.06~0.08, S: ≤0.01, Ti: 0.04~0.07, B: 0.0004~0.0008, N: ≤0.003, Al: 0.025~0.065, the rest is Fe and unavoidable inclusions, through electro-galvanizing After coating the organic film, this invention can produce aging-resistant color-coated boards. However, because this invention uses IF steel (interstitial-free steel, also known as interstitial-free steel) as the substrate to produce home appliance color-coated boards, not only the cost is high, Moreover, the strength and hardness of the steel base will be low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]In this example, the low-cost aging-resistant home appliance color-coated board is made of the following raw materials in weight percentage: C: 0.030%, Si: 0.028%, Mn: 0.35%, P: 0.015%, S: 0.017%, Als: 0.050 %, Ti: 0.017%, N: 0.0024%, and the balance is Fe and other unavoidable impurities.

[0027] A method for manufacturing color-coated sheets for low-cost aging-resistant household appliances, which includes the following steps in sequence: molten iron steelmaking, continuous casting, hot rolling, pickling, cold rolling, hot-dip galvanizing, skin pass, tension leveling, and color coating, wherein the The continuous annealing temperature in the hot-dip galvanizing step is 795°C, and the sum of the elongation in the skin-passing step and the stretching step is 1.2%.

[0028] After inspection, the thickness specification of the color-coated plate for low-cost and aging-resistant household appliances in this embodiment is 0.60 mm, and the weight of the hot-dip galvanized co...

Embodiment 2

[0030] This example is basically the same as Example 1, except that in this example, the low-cost aging-resistant home appliance color-coated board is made of the following raw materials in weight percentage: C: 0.020%, Si: 0.023%, Mn: 0.30 %, P: 0.016%, S: 0.015%, Als: 0.060%, Ti: 0.015%, N: 0.0031%, and the balance is Fe and other unavoidable impurities.

[0031] In the manufacturing method of low-cost aging-resistant color-coated sheets for household appliances, the continuous annealing temperature in the hot-dip galvanizing step is 792. ℃

[0032] After inspection, the thickness specification of the color-coated plate for low-cost and aging-resistant household appliances in this embodiment is 0.50 mm, and the weight of the hot-dip galvanized coating is 100 g / m 2 (double-sided), the thickness of the paint film on the front of the color-coated plate is 21 μm, and the yield strength R P0.2 It is 245MPa; after 2 months of use by the user, there is no wrinkle or edge in the s...

Embodiment 3

[0034] This example is basically the same as Example 1, except that in this example, the low-cost aging-resistant home appliance color-coated board is made of the following raw materials in weight percentage: C: 0.020%, Si: 0.020%, Mn: 0.25 %, P: 0.012%, S: 0.011%, Als: 0.030%, Ti: 0.012%, N: 0.0023%, and the balance is Fe and other unavoidable impurities.

[0035] In the manufacturing method of color-coated sheets for low-cost aging-resistant household appliances, the continuous annealing temperature in the hot-dip galvanizing step is 790°C, and the sum of the elongation in the skin-passing step and the tension-leveling step is 1.1%.

[0036] After inspection, the thickness specification of the color-coated plate for low-cost and aging-resistant household appliances in this embodiment is 0.45 mm, and the weight of the hot-dip galvanized coating is 100 g / m 2 (both sides), yield strength R P0.2 It is 230MPa; after 3 months of use by the user, there is no wrinkle and edge in th...

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Abstract

The invention discloses a low-cost aging resistant household appliance color coated sheet. The color coated sheet is made of, by weight, 0.010-0.030% of C, no more than 0.030% of Si, 0.015-0.35% of Mn, no more than 0.020% of P, no more than 0.020% of S, 0.020-0.060% of A1s, 0.005-0.020% of Ti, no more than 0.0040% of N, and the balance Fe and other unavoidable impurities. The invention further discloses a production method of the household appliance color coated sheet. The method comprises the steps of molten iron steelmaking, continuous casting, hot rolling, acid pickling, cold rolling, hot galvanizing, finishing, pulling correcting and color coating. In the hot galvanizing step, the continuous annealing temperature is 785-795 DEG C. The sum of the ductility of the finishing step and the ductility of the pulling connecting step is 1.0-1.2%. The low-cost aging resistant household appliance color coated sheet and the production method thereof are simple in technology, high in strength and rigidity, good in stamping property, aging resistant, low in cost, and capable of being widely used in the technical field of the iron and steel smelting technology.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a low-cost aging-resistant color-coated plate for household appliances and a production method thereof. Background technique [0002] With the increasing emphasis on energy saving and emission reduction at home and abroad, color-coated steel sheets for home appliances, which are an important direction for the development of coated steel sheets in the future, have been widely used in the home appliance industry. In the production process of color coating, the baking and curing process of color-coated panels for home appliances is an artificial aging process, and the color-coated panels for home appliances need to be placed for a period of time (generally 3 to 6 months) in the subsequent circulation process. Due to natural aging, it is easy to cause tensile strain lines on the surface of the home appliance color-coated board during the stamping process, which not on...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D1/26C21D8/02
Inventor 白会平涂元强陈园林柳长福宋乙峰杜蓉蔡捷黄道兵
Owner 武汉钢铁有限公司
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