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

High-strength dual-phase steel dp780 applied to construction machinery vehicles and its production method

A technology of DP780, production method, applied in the field of metallurgy, can solve the problems of poor toughness, low mechanical strength, high yield-to-strength ratio, etc.

Active Publication Date: 2021-08-20
HANDAN IRON & STEEL GROUP +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the content of martensite or M / A islands in the steel is large and the distribution is uneven, the steel mainly shows the characteristics of high mechanical strength but poor toughness, and the yield ratio is high; on the contrary, when the steel When the content of ferrite in the steel is more, the steel mainly shows a lower mechanical strength.
The low mechanical properties or high yield ratio of steel products cannot meet the requirements of users for steel products

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
  • High-strength dual-phase steel dp780 applied to construction machinery vehicles and its production method
  • High-strength dual-phase steel dp780 applied to construction machinery vehicles and its production method
  • High-strength dual-phase steel dp780 applied to construction machinery vehicles and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment is applied to the high-strength dual-phase steel DP780 for construction machinery vehicles with a thickness of 30 mm, and its chemical composition and mass percentage are shown in Table 1.

[0033] The production method of this embodiment applied to the high-strength dual-phase steel DP780 for construction machinery vehicles includes converter smelting, LF refining, continuous casting, heating, controlled rolling, and controlled cooling. The specific process steps are as follows:

[0034] (1) Converter smelting process: O: 600ppm in steel is controlled, and the amount of slag after tapping is 0.01% of molten steel to ensure the cleanliness of molten steel;

[0035] (2) LF refining process: control the refining time for 35 minutes, operate under 0Pa micro-positive pressure throughout the process to prevent molten steel from absorbing nitrogen; use 6kg / t steel lime, 1.4kg / t steel aluminum wire, and 1kg / t steel aluminum pellets to make white slag Desulfurizat...

Embodiment 2

[0042] This embodiment is applied to the high-strength dual-phase steel DP780 for construction machinery vehicles with a thickness of 30 mm, and its chemical composition and mass percentage are shown in Table 1.

[0043] The production method of this embodiment applied to the high-strength dual-phase steel DP780 for construction machinery vehicles includes converter smelting, LF refining, continuous casting, heating, controlled rolling, and controlled cooling. The specific process steps are as follows:

[0044] (1) Converter smelting process: O: 550ppm in steel is controlled, and the amount of slag after tapping is 0.006% of molten steel to ensure the cleanliness of molten steel;

[0045] (2) LF refining process: control the refining time for 40 minutes, and operate under 20Pa micro-positive pressure throughout the whole process to prevent molten steel from absorbing nitrogen; use 5kg / t steel lime, 1.3kg / t steel aluminum wire, and 0.8kg / t steel aluminum particles to make white ...

Embodiment 3

[0052] This embodiment is applied to the high-strength dual-phase steel DP780 for construction machinery vehicles with a thickness of 25mm, and its chemical composition and mass percentage are shown in Table 1.

[0053] The production method of this embodiment applied to the high-strength dual-phase steel DP780 for construction machinery vehicles includes converter smelting, LF refining, continuous casting, heating, controlled rolling, and controlled cooling. The specific process steps are as follows:

[0054] (1) Converter smelting process: control O: 500ppm in steel, and 0.008% molten steel amount of slag after tapping to ensure the cleanliness of molten steel;

[0055] (2) LF refining process: control the refining time for 38 minutes, and operate under a slight positive pressure of 50 Pa throughout the process to prevent molten steel from absorbing nitrogen; use 10kg / t steel lime, 1.1kg / t steel aluminum wire, and 0.7kg / t steel aluminum particles to make white Slag desulfuri...

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
yield strengthaaaaaaaaaa
yield ratioaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-strength dual-phase steel DP780 applied to engineering machinery vehicles and a production method thereof. The chemical composition and mass percentage are: C: 0.06-0.08%, Mn: 1.55-1.65%, Nb: 0.020 ~0.030%, Ti: 0.010~0.025%, Cr: 0.20~0.30%, B: 0.0008~0.0016%, Als: 0.015~0.045%, the rest is Fe and unavoidable impurities; production methods include converter smelting, LF refining, Continuous casting, heating, controlled rolling, controlled cooling process. The invention optimizes the temperature-controlled rolling and controlled cooling process through reasonable composition design, the mechanical properties of the product meet the requirements of GB / T 20887.3-2010, and the yield ratio of the product is ≤0.67, which better satisfies the requirements of the current large construction machinery vehicles. need.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength dual-phase steel DP780 applied to engineering machinery vehicles and a production method thereof. Background technique [0002] Yield strength ratio refers to the yield point of steel, that is, the ratio of yield strength to tensile strength. This index is an important coefficient to measure the strength reserve of steel. Generally, when the yield strength of a steel material is relatively high, it indicates that the material has strong deformation resistance and is not easy to undergo plastic deformation under the action of external force, but the material has poor resistance to external impact and has a high risk of brittle failure. The reliability of the material is also lower. When the yield strength of the steel material is relatively low, it indicates that the material has good plasticity, has a high work hardening rate, and has no discontin...

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 Patents(China)
IPC IPC(8): C22C38/38C22C38/26C22C38/28C22C38/32C22C38/06C21D8/02
CPCC21D8/0226C21D2211/002C21D2211/008C22C38/06C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 李玉谦孙电强吕德文张瑞超张卫攀成慧梅檀丽静
Owner HANDAN IRON & STEEL GROUP
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