Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Aluminum-plated steel sheet having superior corrosion resistance, hot press formed product using the same, and method for production thereof

A hot-press forming and corrosion-resistant technology, applied in hot-dip plating process, coating, transportation and packaging, etc., can solve the problems of accelerated local corrosion and corrosion, achieve easy production process, simple production conditions, and improve local corrosion resistance sexual effect

Inactive Publication Date: 2012-02-08
POHANG IRON & STEEL CO LTD
View PDF5 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such cracks are formed on the coating, although a thick alloy coating of more than 30 μm is formed by the HPF method, corrosion along the cracks will inevitably occur, so that localized corrosion, especially pitting corrosion, will be accelerated.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Aluminum-plated steel sheet having superior corrosion resistance, hot press formed product using the same, and method for production thereof
  • Aluminum-plated steel sheet having superior corrosion resistance, hot press formed product using the same, and method for production thereof
  • Aluminum-plated steel sheet having superior corrosion resistance, hot press formed product using the same, and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This example is about after HPF treatment (Fe 3 The relationship between the thickness occupancy rate of the Al+FeAl) compound layer in the entire coating and the heating temperature and heating time. The chemical composition range of the steel plate used in this experiment includes: C: 0.15-0.35wt%, Si: 0.5wt% or less, Mn: 1.5-2.2%, P: 0.025% or less, S: 0.01% or less, Al: 0.01-0.05% , N: 50-200ppm, Ti: 0.005-0.05%, W: 0.005-0.1%, B: 1-50ppm, the rest is Fe and necessary impurities, among which Ti / N: less than 3.4, Ceq: 0.48-0.58, And Ar3 temperature is 670-725°C; but not limited thereto. And, the coating bath contains 9wt% Si, and the coating weight is controlled at 20, 40 and 80g / m 2 . Under different conditions, the heating temperature was maintained at 800-970°C, (Fe 3 The target occupancy of the Al+FeAl) intermetallic compound layer is 40% or more. When the heating temperature is maintained at 3-10 minutes, the relationship is as follows figure 2 shown in ....

Embodiment 2

[0076] In this example, the (Fe 3 Steel sheets with different Al+FeAl) layer occupancy ratios. The tensile strength and corrosion resistance of these steel sheets were evaluated.

[0077] As mentioned above, there are no particular restrictions on the chemical composition system and component content of the hot-rolled steel sheet or cold-rolled steel sheet used as the raw material steel sheet for manufacturing the aluminum-coated steel sheet or the aluminum-alloy-coated steel sheet. However, it is sufficient as long as the chemical composition and hardenability of the steel sheet are sufficient to obtain the target strength and phase after hot press forming. The chemical composition ranges of the steel sheets used in this example are expressed in wt%.

[0078] The chemical composition range of available steel plates is as follows: C: 0.15-0.35wt%, Si: 0.5wt% or less, Mn: 1.5-2.2%, P: 0.025% or less, S: 0.01% or less, Al: 0.01-0.05%, N : 50-200ppm, Ti: 0.005-0.05%, W: 0.005-...

Embodiment 3

[0084] The alloy layer part of the steel plate obtained under each group of conditions in Example 2 was measured using a scanning electron microscope, and the thickness and corrosion resistance of the intermetallic compound layer in the measured coating are shown in Table 2. As a reference, the corrosion resistance is evaluated by a salt spray test (5% NaCl solution, 35° C.), and the spraying time of the salt spray is 24-96 hours.

[0085] Table 2

[0086]

[0087] As shown in Table 2 above, in the aluminum-coated steel sheets A to E, (Fe 3 The thickness occupancy ratios of the Al+FeAl) layer thickness in the entire thickness are 9.7%, 25.8%, 47.2%, 94.9% and 100%, respectively. In dry plating, the occupancy rates are 81.4% and 100%, respectively. As mentioned above, the relationship between heating temperature and time determines the thickness of the coating after HPF heat treatment (see figure 2 (a) and figure 2 (b)). If the necessary temperature and time condition...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The present invention provides a plated steel sheet and a method for production thereof, in which conditions for a plating bath are optimized during production of a hot rolled steel sheet or a cold rolled steel sheet into an aluminum-plated steel sheet, and processes are controlled during production of a hot press formed product from the steel sheet, thereby forming a plating layer having a (Fe3Al+FeAl) compound layer at a high rate at the surface of the steel sheet. The present invention also provides a hot press formed product using the steel sheet, and a method for production thereof.; In cases where the (Fe3Al+FeAl) compound layer has an appropriate occupancy rate to the thickness of the whole plating layer, superior resistance against crack and corrosion is achieved to remarkably improve a local corrosion resistance of the hot press formed product, specifically, resistance against a hole corrosion, thereby obtaining high quality hot press formed products with high productivity and low costs.

Description

technical field [0001] The invention relates to an aluminum alloy coated steel plate for hot press forming, a hot press formed product made of the steel plate and a manufacturing method thereof. More particularly, the present invention relates to an aluminum-coated steel sheet having remarkably improved localized corrosion resistance (such as pitting corrosion resistance) in an aluminum-coated steel sheet for hot press forming and a method of manufacturing an ultra-high-strength steel sheet using the same , a hot press-formed product made of such a steel plate, and a method for their manufacture. Background technique [0002] In recent years, many safety regulations for the protection of vehicle occupants and fuel efficiency regulations for the protection of the environment have been added. In this regard, strength improvement and weight reduction of structural components used in vehicles have been proposed as important research subjects. [0003] Typically, automotive par...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/12B21D22/20
CPCC23C2/02C23C2/12C23C2/26C23C2/34Y10T428/12757C23C2/022C23C2/28C23C2/29C23C2/40C23C2/30C22C38/02C22C38/04C22C38/14C22C38/001
Inventor 赵悦来金泰昊朴晟浩白应律
Owner POHANG IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com