1800MPa-level plating-free thermoforming steel with low high-temperature friction coefficient and preparation method of 1800MPa-level plating-free thermoforming steel

A hot forming steel and friction coefficient technology, applied in the field of metallurgy, can solve the problems affecting the profile size and surface quality, unfavorable cold bending performance of parts, unfavorable plastic toughness of parts, etc., so as to improve the hot forming stamping environment, make the process easier to control, The effect of improving the service life

Inactive Publication Date: 2020-04-21
MAANSHAN IRON & STEEL CO LTD
View PDF10 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of 0.41-0.50% C in this patent increases the hardness of the quenched martensite, but it is actually not conducive to the plasticity and toughness of the formed part; the addition of 1.6-2.0% Mn is easy to produce a banded structure, which is harmful to the formed part. The cold bending performance is unfavorable;

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
  • 1800MPa-level plating-free thermoforming steel with low high-temperature friction coefficient and preparation method of 1800MPa-level plating-free thermoforming steel
  • 1800MPa-level plating-free thermoforming steel with low high-temperature friction coefficient and preparation method of 1800MPa-level plating-free thermoforming steel
  • 1800MPa-level plating-free thermoforming steel with low high-temperature friction coefficient and preparation method of 1800MPa-level plating-free thermoforming steel

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0094] A method for preparing 1800MPa grade uncoated hot-formed steel with low high-temperature friction coefficient, the steps are:

[0095] 1) Steelmaking production

[0096] Based on the role of mold slag in the steelmaking process (1. to isolate molten steel from the air; 2. to lubricate during continuous casting), for 1800MPa grade hot forming steel, due to the difference in composition, high-carbon mold slag is preferred.

[0097] 2) Continuous casting + hot rolling production

[0098] The casting slab is preferentially organized in the way of hot charging, on the one hand, in order to improve the production tempo, and on the other hand, in order to reduce the risk of cracks in the casting slab; Enter the heat preservation pit for slow cooling treatment. The purpose of slow cooling treatment is twofold. One is to reduce the risk of cracks, and the other is to slowly cool and expand hydrogen to reduce the hydrogen content inside the slab.

[0099] Furnace temperature: 1...

Embodiment 1

[0132] In this embodiment, the surface roughness Ra is 2.0 μm, and the average high temperature friction coefficient is 0.76.

[0133] The surface morphology of the steel strip is as Figure 5 , Figure 6 As shown, the high temperature friction coefficient of the strip is as Figure 11 shown.

[0134] like Figure 14 As shown, there is a thicker oxide layer on the surface of the part.

Embodiment 2

[0136] In this embodiment, the surface roughness Ra is 0.8 μm, and the average high temperature friction coefficient is 0.64.

[0137] The surface morphology of the steel strip is as Figure 7 , Figure 8 As shown, the high temperature friction coefficient of the strip is as Figure 12 shown.

[0138] like Figure 16 As shown, there is no obvious oxide layer on the surface of the part, but there is a slight carbonization of anti-rust oil.

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
Surface roughnessaaaaaaaaaa
Surface roughnessaaaaaaaaaa
Login to view more

Abstract

The invention discloses 1800MPa-level plating-free thermoforming steel with a low high-temperature friction coefficient and a preparation method of the 1800MPa-level plating-free thermoforming steel.Main chemical components of the 1800MPa-level plating-free thermoforming steel comprise, by mass percent, 0.25%-0.35% of C, not larger than 0.5% of Si, 0.5%-1.5% of Mn, not larger than 0.020% of P, not larger than 0.010% of S, not larger than 0.50% of Cr, 0.01%-0.06% of Al, not larger than 0.04% of Ti, not larger than 0.5% of Nb+V+Mo, not larger than 0.003% of B and the balance Fe and inevitable impurities. Through optimization to components and processes, the surface state of the plating-free thermoforming steel raw material is improved, and a good thermoforming steel raw material is providedfor subsequent preparation of thermoforming parts.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a 1800MPa grade non-coated hot-formed steel with a low and high-temperature friction coefficient and a preparation method thereof. Background technique [0002] With the continuous development of hot forming technology, the amount of hot stamping steel is also increasing. At present, the hot-formed steel widely used in the market is divided into coated products and uncoated products according to the coating state. [0003] For coated plate products, there is no need for a protective atmosphere in the furnace during the thermoforming process, and the presence of the coating makes it have good high-temperature oxidation resistance during the thermoforming process, and there is no need for shot blasting and oiling treatment after thermoforming, so it has been favored by many OEMs. However, since Al-Si coated hot-forming steel is restricted by patents and its functions depend on im...

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
IPC IPC(8): C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/04C22C38/02C22C33/04C21D1/74C21D8/02C21D1/26C21D9/56C21D9/663
CPCC22C38/32C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/04C22C38/02C22C38/002C22C33/04C21D1/74C21D8/0205C21D8/0247C21D8/0226C21D8/0236C21D1/26C21D9/56C21D9/663C21D2211/008
Inventor 詹华晋家春王蕾崔磊刘永刚李子涛张军谷海容肖洋洋彭梦都
Owner MAANSHAN IRON & 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