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Steel sheet for hot pressing and method for producing hot pressed member using same

A technology for hot-pressing steel plates and manufacturing methods, which is applied in the field of hot-pressing steel plates, can solve problems such as poor appearance, decreased coating adhesion, and damage to molds, and achieve excellent coating adhesion, excellent oxidation resistance, and Excellent pitting resistance

Inactive Publication Date: 2014-02-19
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this hot pressing, since the steel sheet is heated to a high temperature of about 950°C before hot pressing, oxide scale (iron oxide) is formed on the surface of the steel sheet, and the scale peels off during hot pressing, resulting in damage to the mold Or the problem of damaging the surface of the component after hot pressing
In addition, the scale remaining on the surface of the parts becomes a cause of poor appearance and decreased coating adhesion
Therefore, pickling, shot blasting, etc. are usually performed to remove the scale on the surface of the parts, but this complicates the manufacturing process and leads to a decrease in productivity
In addition, parts such as running parts and body structural parts of automobiles also require excellent corrosion resistance, and the hot-pressed parts manufactured through the above process are not equipped with anti-rust films such as plating, so the corrosion resistance is very insufficient

Method used

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  • Steel sheet for hot pressing and method for producing hot pressed member using same
  • Steel sheet for hot pressing and method for producing hot pressed member using same
  • Steel sheet for hot pressing and method for producing hot pressed member using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach A）

[0040] A-1 steel plate for hot pressing

[0041] A-1-1) Coating

[0042] In this embodiment A, in order to suppress the formation of scale and ZnO during hot pressing, a plating layer containing 10 to 25% by mass of Ni and the balance of Zn and unavoidable impurities is provided on the surface of the steel sheet. By making the Ni content of the plating layer 10 to 25% by mass, it is possible to form 2 Zn 11 、NiZn 3 、Ni 5 Zn 21 Any one of the crystal structures has a melting point as high as the γ phase of 881°C, so the generation reaction of scale and ZnO during heating can be suppressed to a minimum. In addition, since Zn-Fe metal oxides are not formed when heated, the generation of scale accompanying cracks is also suppressed. In addition, since the plating layer remains in the form of the γ phase after hot pressing, excellent corrosion resistance is exhibited due to the sacrificial anticorrosion effect of Zn. It should be noted that the formation of the γ phase with a ...

Embodiment A

[0096] As the base steel sheet, a steel sheet containing, by mass %, C: 0.23%, Si: 0.25%, Mn: 1.2%, P: 0.01%, S: 0.01%, Al: 0.03%, N: 0.005%, and Cr: 0.2% was used. , Ti: 0.02%, B: 0.0022%, Sb: 0.008%, and the balance is composed of Fe and unavoidable impurities, and Ac 3 A cold-rolled steel sheet with a transformation point of 820°C and a thickness of 1.6 mm. On the surface of the cold-rolled steel sheet, in a plating solution containing 200g / L nickel sulfate hexahydrate and 10-100g / L zinc sulfate heptahydrate with a pH of 1.5 and a temperature of 50°C, the current density is 5-100A / dm 2 Change between them, implement electroplating treatment, and form a coating with Ni content (the balance is Zn and unavoidable impurities) and adhesion amount and η phase content shown in Tables 1 and 2. In addition, except for some cases, the coating is coated with a composition containing a solid lubricant and a compound or an organic binder shown in Tables 1 and 2, and the balance is a ...

Embodiment approach B）

[0131] B-1 steel plate for hot pressing

[0132] B-1-1) Coating

[0133] In this embodiment B, in order to suppress the diffusion of Zn in the plating layer to the base steel sheet and obtain excellent pitting corrosion resistance, a plating layer containing 60% by mass or more of Ni and the balance consisting of Zn and unavoidable impurities is provided on the surface of the steel sheet. I. When the amount of Ni in the plating layer I is less than 60% by mass, diffusion of Zn in the plating layer to the base steel sheet cannot be sufficiently suppressed, and excellent pitting corrosion resistance cannot be obtained. The amount of Ni in the plating layer I is preferably 100% by mass, but when it is less than 100% by mass, the balance is Zn having a sacrificial anti-corrosion effect and unavoidable impurities. In addition, when the adhesion on each side of the coating I is less than 0.01g / m 2 When , the effect of inhibiting the diffusion of Zn to the base steel plate cannot ...

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Abstract

Provided are: a steel sheet that is for hot pressing, has superior cold pressing properties as well, has superior oxidation resistance, and can suppress the occurrence of ZnO and scales during hot pressing; and a method for producing a hot pressed member using the steel sheet for hot pressing. The steel sheet for hot pressing is characterized by having, sequentially from the steel sheet surface: a plated layer that contains 10-25 mass% of Ni, the remainder comprising Zn and unavoidable impurities, and that is deposited at a quantity of 10-90 g / m2; and a lubricating layer containing a solid lubricant.

Description

technical field [0001] The present invention relates to a hot-pressed steel sheet suitable for manufacturing parts such as running parts and vehicle body structural parts of automobiles by hot-pressing, and a method for manufacturing hot-pressed parts using the hot-pressed steel sheet. Background technique [0002] In the past, many parts such as running parts and body structural parts of automobiles were manufactured by pressing steel plates with a predetermined strength. In recent years, from the viewpoint of protecting the global environment, the weight reduction of automobile bodies has been eagerly desired, and efforts have been made to increase the strength of the steel sheets used to reduce the thickness of the sheets. However, as the strength of the steel sheet increases, the press workability decreases, so it is often difficult to process the steel sheet into a desired part shape. [0003] Therefore, in Patent Document 1, a processing technique called hot pressing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C21D1/18C22C18/00C22C38/00C22C38/60C25D5/26
CPCC22C38/32C21D8/0205C25D5/50C23C28/322C22C38/04C22C38/28C25D3/562B32B15/013C25D7/00C25D5/36C22C38/02C22C18/00C25D7/0614C22C38/60C21D8/0242C21D1/673C23C28/34C23C28/00C22C38/18C25D3/565C25D5/48Y10T428/12549Y10T428/12569Y10T428/12757Y10T428/12799Y10T428/12806Y10T428/12972Y10T428/12979Y10T428/2495Y10T428/27Y10T428/273B05D7/14B32B15/04B32B15/043C23C28/02C23C28/021C23C28/025C23C28/3225
Inventor 三好达也中岛清次中丸裕树
Owner JFE STEEL CORP
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