Oxide-enhanced high heat input welding steel plate

A large heat input welding and oxide technology is applied in the field of oxide-enhanced large heat input welded steel plates, which can solve the problems of reduced strength of welding heat affected zone, waste of Fe-Ti alloy, and deterioration of toughness of welded coarse grain zone, etc. Achieve the effect of ensuring welding performance

Active Publication Date: 2016-06-29
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
View PDF17 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that a large amount of precious metal element Ni needs to be added to the steel plate, which greatly increases the cost of the alloy
[0005] The second type is to reduce the C equivalent of the base steel plate through low-carbon and low-alloy design, and to form TiN particles by controlling the Ti / N ratio in the steel to prevent the formation of austenite grains in the coarse-grained region under large heat input welding conditions. grow up, so as to achieve the purpose of improving the low-temperature toughness of the welding heat-affected zone, such as patents CN201110071409, CN201110172661, CN201410643430, etc. The disadvantage of this method is that the welding heat input can only be increased to about 120kJ / cm, and continuing to increase the welding heat input will lead to The high-temperature residence time in the welding heat-affected zone is greatly prolonged, which causes a large amount of TiN particles to dissolve, which cannot effectively control the growth of austenite grains, which seriously deteriorates the toughness of the welded coarse-grained zone, and also leads to the strength of the welded heat-affected zone. reduce
[0006] The third type is to improve the low-temperature toughness of the welded heat-affected zone under the condition of large heat input welding by forming oxide particles of a specific type and size in the steel plate, but this type of method currently has the following disadvantages: ① In During the smelting process, the oxygen content in the molten steel is controlled at a relatively high level (10-600ppm), and Ti is used for deoxidation. When the oxygen content in the molten steel is high, the yield of Ti will be significantly reduced, which requires adding A large number of Fe-Ti alloys lead to waste of Fe-Ti alloys, such as patent CN100523255C; ② Reasonable constraints are not made on the content relationship between Ti, Mg, Al, O, and N elements, resulting in the number of oxide particles formed It is too small, and the proportion of oxide particles that can promote the nucleation of intragranular ferrite is too small, which makes it difficult for the welding heat input to exceed 600kJ / cm, and the low temperature toughness of the welding heat affected zone is difficult to meet the impact toughness requirement of -60 °C , such as patents CN201210062515, CN201010132582, CN201110003621, JP2005-232515A, JP2005-105322A, JP2011-74447A, etc.
[0007] In summary, there is still a lack of a steel plate that can withstand heat input welding of more than 600kJ / cm and can ensure the impact toughness of the welded heat affected zone at -60°C.

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
  • Oxide-enhanced high heat input welding steel plate
  • Oxide-enhanced high heat input welding steel plate
  • Oxide-enhanced high heat input welding steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The technical solutions of the present invention will be further described below in conjunction with preferred embodiments.

[0041] The concrete composition of embodiment 1~10# and comparative example 11~15# is shown in Table 1, produces according to following production process:

[0042] (1) During the smelting and casting process, smelting and casting into slabs are carried out in accordance with the composition range and element ratio relationship in the claims;

[0043] (2) In the heating process, the heating temperature of the slab is controlled between 1150 and 1250 ° C, and the holding time is 2 to 3 hours;

[0044] (3) In the rolling process, the cumulative rolling reduction rate is ≥ 80%;

[0045] (4) In the cooling process, directly water-cool after rolling, cool to 300-450°C at a rate of 5-30°C / s, and then air-cool to room temperature.

[0046] attached figure 1 It is a typical microstructure photo of the steel plate of the embodiment, showing that the ba...

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
diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to an oxide-enhanced high heat input welding steel plate. The steel plate comprises the following chemical components in percentage by weight: C less than or equal to 0.10%, Si less than or equal to 0.20%, 1.20-1.80% of Mn, 0.01-0.10% of Ti, Alt less than or equal to 0.01%, 0.001-0.005% of Als, 0.0005-0.0030% of Mg, N less than or equal to 0.006%, 0.0010-0.0050% of O and the balance of Fe and part alloy elements and unavoidable impurities. The steel plate disclosed by the invention has the advantages that the proportion relationship among the elements of Ti, Al, Mg, O and N is reasonably controlled to ensure that a large number of TiOx-MgAl2O4 composite oxide particles with the size of 0.2-2.0 micrometers are formed in the steel plate, so that the welding heat input that the steel plate can bear is increased to 600-1000kJ/cm and the impact energy of the welding heat-affected zone at the temperature below 60 DEG C can be guaranteed to be greater than or equal to 100J.

Description

technical field [0001] The invention belongs to the field of production of welded steel plates capable of large heat input, and in particular relates to an oxide-enhanced welded steel plate capable of large heat input. Background technique [0002] At present, as the construction of ships, pressure vessels, bridges and other structures is developing in the direction of large-scale and long-span, higher and higher requirements are put forward for welding efficiency. Therefore, many high-efficiency welding methods such as double-wire and multi-wire submerged arc welding, gas-electric vertical welding, electroslag welding, etc. are more and more widely put into industrial applications. However, with the application of such high-efficiency welding methods, the welding heat input has gradually increased from 15 to 50kJ / cm to 70 to 600kJ / cm, and even as high as 1000kJ / cm. The strength and toughness of the welded joints will seriously deteriorate and cannot meet the requirements o...

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): C22C38/04C22C38/14C22C38/02C22C38/06
CPCC22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 李小宝张宇周云
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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