Ultra high strength hot dip aluminized steel plate and manufacturing method thereof

A hot-dip aluminized, ultra-high-strength technology, which is applied in the field of continuous production of hot-dip aluminized steel sheets, can solve problems such as reduced grain boundary cohesion, no plasticity, and reduced steel plate shape, and achieve the effect of improving comprehensive performance

Active Publication Date: 2016-03-30
ANGANG STEEL CO LTD
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The materials used in the existing thermoforming process are mainly B-containing steel, typical steel grades are 22MnB5, 30MnB, etc. Although the strength of the material has been greatly improved, the shaping of the steel plate has declined seriously, or There is basically no plasticity. In addition, the existence of B elements pollutes the grain boundary, reduces the cohesion of the grain boundary, and also precipitates Fe, C, and B compounds at the grain boundary.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Chemical composition of steel:: C0.21%, Si0.30%, Mn1.10%, P≤0.020%, S≤0.020%, Al0.80%, Mo0.5%, Cr0.40%, Nb0.06% , and the rest are Fe and some unavoidable impurity elements.

[0029] Manufacturing process: After smelting, casting, hot-rolling, pickling and cold-rolling the steel of the above composition, the steel plate is heated to 800°C in the continuous hot-dip aluminum production line, the holding temperature is 790°C, and the cooling rate is not greater than 10°C / s Cool to the temperature of hot-dip aluminizing, then perform hot-dip aluminizing, and cool at a rate not greater than 10°C / s after leaving the plating solution to obtain an ultra-high-strength hot-dip aluminized steel sheet. The composition of the plating solution is 90% Al+10% Si.

[0030] The heating and holding temperature before hot stamping should be controlled at 950°C, the cooling start temperature should be controlled at 940°C, and the cooling rate should be 50°C / s to 280°C.

[0031] The struct...

Embodiment 2

[0034] Chemical composition of steel: C0.45%, Si1.50%, Mn5.00%, P≤0.020%, S≤0.020%, Al0.02%, Ni0.40%, Mo0.30%, Ti0.08%, Ca0.0004%, Mg0.0003%, the rest is Fe and some unavoidable impurity elements.

[0035] Manufacturing process: After smelting, casting, hot-rolling, pickling and cold-rolling the steel of the above composition, the steel plate is heated to 810°C in the continuous hot-dip aluminum production line, the holding temperature is 810°C, and the cooling rate is not greater than 15°C / s Cool to the hot-dip aluminizing temperature, then perform hot-dip aluminizing, and cool at a rate of no more than 15°C / s after leaving the plating solution to obtain an ultra-high-strength hot-dip aluminized steel sheet. The composition of the plating solution is 92% Al+8% Si.

[0036] The heating and holding temperature before hot stamping should be controlled at 930°C, the cooling start temperature should be controlled at 920°C, the temperature should be cooled to 240°C, and the coolin...

Embodiment 3

[0040]Chemical composition of steel: C0.30%, Si2.00%, Mn2.50%, P≤0.020%, S≤0.020%, Al0.02%, Mo0.40%, Cr0.20%, Nb0.03%, Ti0.04%, the rest is Fe and some unavoidable impurity elements.

[0041] Manufacturing process: After smelting, casting, hot-rolling, pickling and cold-rolling the steel of the above composition, the steel plate is heated to 750°C in the continuous hot-dip aluminum production line, the holding temperature is 750°C, and the cooling rate is not greater than 12°C / s Cool to the hot-dip aluminizing temperature, then perform hot-dip aluminizing, and cool at a rate of no more than 15°C / s after leaving the plating solution to obtain an ultra-high-strength hot-dip aluminized steel sheet. The composition of the plating solution is 88% Al+12% Si.

[0042] The heating and holding temperature before hot stamping should be controlled at 850°C, the cooling start temperature should be controlled at 840°C, and the temperature should be cooled to 220°C at a cooling rate of 40°...

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
yield strengthaaaaaaaaaa
strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to view more

Abstract

The invention provides an ultra high strength hot dip aluminized steel plate, which comprises the following components by weight: 0.20%-0.50% of C, 0.30%-2.00% of Si, 1.10-5.00% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.02%-1.50% of Al, less than or equal to 1.50% of Mo, also contains at least one of 0.20%-1.00% of Cr and 0.20%-3.00% of Ni, also contains at least one of less than or equal to 0.10% of Nb and less than or equal to 0.25% of Ti, also contains at least one of less than or equal to 0.004% of Ca and less than or equal to 0.004% of Mg, and the balance Fe and inevitable impurity elements. Specifically, Cr+Mo and Ni+Mo are not less than 0.6%, and Nb+Ti is not less than 0.06%. The method includes: heating the steel plate on a continuous hot dip aluminizing line to 750DEG C-850DEG C, preserving the temperature at 750 DEG C-840DEG C, performing cooling to hot dip aluminizing temperature by a cooling speed of not greater than 20DEG C / s, then conducting hot dip aluminizing, discharging the plating solution, and then performing cooling at a speed of not greater than 20DEG C / s. The steel plate greatly enhances the plasticity and toughness of hot dip aluminized steel plate after hot stamping forming, and improves the comprehensive performance of the product.

Description

technical field [0001] The invention belongs to the field of continuous production and manufacture of hot-dip aluminum-coated steel sheets, and in particular relates to an ultra-high-strength hot-dip aluminum-coated steel sheet and a manufacturing method thereof. Background technique [0002] For a long time, steel has been the basis of the automobile industry. Although the amount of aluminum alloy, magnesium alloy, plastic and composite materials in automobile manufacturing has been increasing, high-strength steel has high potential for weight reduction, high impact absorption energy, and high fatigue. The advantages of strength, high formability and low planar anisotropy have become the main lightweight materials for the automotive industry. The automobile industry in the 21st century to reduce fuel consumption and reduce CO 2 And exhaust emissions have become the main needs of the society. In order to adapt to this development trend, the steel industry has developed many...

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): C22C38/58C22C38/50C22C38/48C22C38/38C22C38/28C22C38/26C22C38/12C22C38/14C22C33/04
Inventor 吕家舜李锋杨洪刚周芳刘仁东
Owner ANGANG STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap