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

Method for improving internal quality of ship plate steel

An internal quality, ship plate steel technology, applied in the direction of manufacturing converters, etc., can solve the problems of the gap in the qualification rate of steel plate inspection, high air humidity, and hydrogen addition in molten steel, so as to improve the inspection qualification rate, improve user satisfaction, reduce The effect of production costs

Pending Publication Date: 2022-07-05
ANGANG STEEL CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the inspection results of finished steel plates, the existing ship plate steel plate layering phenomenon is more obvious, and there is still a gap between the qualified rate of steel plate flaw detection and the same industry, which affects the satisfaction of ship plate users.
[0003] Due to the high air humidity in coastal areas, the hydrogenation of molten steel is relatively serious during the process of smelting molten steel, which affects the performance of the steel plate and the qualified rate of steel plate flaw detection is low
In order to reduce the hydrogen content of molten steel, it is necessary to increase the RH refining process for dehydrogenation of molten steel, which increases the cost of the process and the complexity of the process

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
  • Method for improving internal quality of ship plate steel
  • Method for improving internal quality of ship plate steel
  • Method for improving internal quality of ship plate steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Taking furnace number 18ND3166 and steel grade AH36 as an example, the specific embodiments of the present invention are further described, but are not intended to limit the scope of the present invention:

[0038] An AH36 high-strength ship plate steel with a thickness of 36mm contains the following chemical components by mass percentage: C: 0.14%, Si: 0.14%, Mn: 1.47%, P: 0.018%, S: ≤ 0.006%, Ni: 0.008% , V: 0.0031%, Nb: 0.0042%, Ti: 0.016%, Als: 0.018%, and the balance is Fe.

[0039] The turnover time of the turnover tank is 92min, the tapping temperature of the converter is 1697℃, the high carbon ferromanganese is 1.99t, no recarburizer is added, the smelting cycle of the LF furnace is 26min, the heating time is 5.02min, the hydrogen content of the molten steel is 1.7ppm, the steel plate is not stacked, and the steel plate is not stacked. The qualified rate of flaw detection is 88.46%.

Embodiment 2

[0041]Taking furnace number 18ND4318 and steel grade AH36 as examples, the specific embodiments of the present invention are further described, but are not intended to limit the scope of the present invention:

[0042] An AH36 high-strength ship plate steel with a thickness of 24-25mm contains the following chemical components by mass percentage: C: 0.135%, Si: 0.135%, Mn: 1.46%, P: 0.013%, S: 0.005%, Ni: 0.0068 %, V: 0.03%, Nb: 0.018%, Ti: 0.015%, Als: 0.020%, and the balance is Fe.

[0043] The turnover time of the turnover tank is 88min, the tapping temperature of the converter is 1696℃, the high carbon ferromanganese is 1.79t, no recarburizer is added, the smelting cycle of the LF furnace is 25min, the heating time is 2.12min, the hydrogen content of the molten steel is 3.2ppm, and the stacking temperature of the steel plate is 264℃. The stacking time is 24.8h, and the qualified rate of steel plate flaw detection is 100%.

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of ship plate steel production, in particular to a method for improving the internal quality of ship plate steel. The preparation method comprises a molten iron pretreatment process, a converter smelting process, an argon blowing treatment process, an LF refining process, a continuous casting process, a heating process, a rolling process and a stack cooling process. (1) in the converter smelting process, the tapping temperature of a converter is higher than 1640 DEG C, and high-carbon ferromanganese is used for alloying in the converter; a heat transfer tank is used, and the interval time from the completion of continuous casting pouring to the beginning of tapping of the next heat is shorter than 160 min; (2) in the LF refining process, the smelting period of an LF furnace is controlled within 40 min; (3) in the continuous casting process, the baking time of a tundish is longer than 120 min; (4) in the continuous casting process, the hydrogen content of the molten steel is measured, and if the hydrogen content of the molten steel is controlled to be 2.0 ppm or below, steel plate stacking after rolling is not conducted; and if the hydrogen content of the molten steel is larger than 2.0 ppm, the rolled steel plates are stacked, and the steel plates are stacked after hot straightening. The internal quality of ship plate steel is improved, the flaw detection qualification rate of products is increased, and the use satisfaction of customers is improved.

Description

technical field [0001] The invention relates to the technical field of ship plate steel production, in particular to a method for improving the internal quality of ship plate steel. Background technique [0002] Shipbuilding industry is one of the pillar industries of my country's national economy. It has developed rapidly in recent years, providing broad application prospects for the application of hull structural steel. Shipbuilding steel plates are the main raw materials for shipbuilding. In the weight of the hull, steel accounts for 90%, of which Plates account for 70% to 80% of steel. Marine steel is mainly used for the deck, outer plate, bottom plate and cabin structure of the hull. With the accelerated pace of green and high-quality development in my country, the development of light-weight and high-quality ship plate steel is still the development direction of ship materials. However, judging from the inspection results of finished steel plates, the existing ship pl...

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): C22C33/06C21C5/28C21C7/00B22D11/16
CPCC22C33/06C21C5/28C21C7/00B22D11/16
Inventor 苏小利马成杨生田吕志勇田永久吴玉治张坤罗军
Owner ANGANG 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