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Hydroelectric 800 MPa low-alloy high-strength steel welded rod and preparation method thereof

An 800mpa, low-alloy technology, used in welding equipment, metal processing equipment, welding media, etc., can solve the problems of reduced weldability, increased crack susceptibility, and increased welding difficulty of high-strength steel, and can inhibit softening and deposition rate. Fast, spatter-less effect

Active Publication Date: 2016-03-30
SICHUAN XIYE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As the grade of high-strength steel increases, the weldability of high-strength steel decreases, welding difficulty increases, post-weld stability decreases, plastic toughness deteriorates, crack sensitivity increases, and a series of defects such as softening and embrittlement are prone to occur in the heat-affected zone

Method used

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  • Hydroelectric 800 MPa low-alloy high-strength steel welded rod and preparation method thereof
  • Hydroelectric 800 MPa low-alloy high-strength steel welded rod and preparation method thereof
  • Hydroelectric 800 MPa low-alloy high-strength steel welded rod and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take marble 35% by weight percentage; Fluorite 23%; High temperature pretreatment mixed powder (rutile, silicon micropowder, TiO 2 , MgO, Al 2 o 3 Minerals and chemical raw materials are uniformly mixed according to a certain proportion) 22%; reducing agent (ferromanganese and ferrosilicon) 10.0%; alloying agent (a mixture of chromium powder, nickel powder, molybdenum powder and titanium alloy powder) 9.20%; rare earth fluorine Compound powder 0.80%; (2) pretreatment mixed powder sintering temperature is 900 DEG C, and the time is 2 hours, control the particle size of each component powder in the above (1) to 40~180 mesh, place it in a mixer and stir evenly; (3 ) was added to the lithium-potassium-sodium water glass mixed uniformly and left to stand for 1 hour, and the Baume concentration was 37°Bé. Continue to stir, the stirring speed is 25n / min, the time is 20min, and then use the rolling powder mixing equipment for rolling, the rolling speed is 20n / min, and the...

Embodiment 2

[0037] (1) take marble 32% by weight percentage; Fluorite 21%; High temperature pretreatment mixed powder (rutile, silica powder, TiO 2 , MgO, Al 2 o 3 Minerals and chemical raw materials are uniformly mixed according to a certain proportion) 24%; reducing agent (ferromanganese and ferrosilicon) 11.0%; alloying agent (a mixture of chromium powder, nickel powder, molybdenum powder and titanium alloy powder) 10.0%; rare earth fluorine Compound powder 2.0%; (2) pretreatment mixed powder sintering temperature is 900 ℃, time is 2 hours, the particle size of each component powder in (1) is controlled to be 40~180 mesh, is placed in the mixer and stirred evenly; (3) Add the lithium-potassium-sodium water glass that is mixed evenly and stand for 1 hour, and the Baume concentration is controlled at 39°Bé. Continue to stir, the stirring speed is 25n / min, the time is 20min, and then use the rolling powder mixing equipment for rolling, the rolling speed is 20n / min, and the rolling time ...

Embodiment 3

[0041] (1) take marble 40% by weight percentage; Fluorite 24%; High temperature pretreatment mixed powder (rutile, silica powder, TiO 2 , MgO, Al 2 o 3 Minerals and chemical raw materials are uniformly mixed according to a certain proportion) 17.2%; reducing agent (ferromanganese and ferrosilicon) 9.0%; alloying agent (a mixture of chromium powder, nickel powder, molybdenum powder and titanium alloy powder) 8.6%; rare earth fluorine Compound powder 1.20%; (2) The sintering temperature of the pretreated mixed powder is 900°C, and the time is 2 hours. The particle size of each component powder in (1) is controlled to 40-180 mesh, and placed in a mixer to stir evenly; (3) Add lithium-potassium-sodium water glass which is mixed well and let stand for 1 hour. Continue to stir, the stirring speed is 25n / min, the time is 20min, and then use the rolling powder mixing equipment for rolling, the rolling speed is 20n / min, and the rolling time is 8min; (4) Prepare the drug skin in the d...

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Abstract

The invention discloses a hydroelectric 800 MPa low-alloy high-strength steel welded rod and a preparation method thereof. The hydroelectric 800 MPa low-alloy high-strength steel welded rod comprises a core wire and a microalloyed coating wrapping the surface of the core wire. Welded rod deposited metal is composed of, by weight, 0-0.06% of C, 0.20%-0.45% of Si, 1.40%-1.70% of Mn, 0.20%-0.40% of Cr, 1.80%-2.60% of Ni, 0.25%-0.45% of Mo, 0-0.005% of S, 0-008% of P, 0-0.020% of Ti, 0-0.001% of Re and the balance Fe. The welded rod can be applied to welding of 800 MPa high-strength steel thick plates in construction of water pumping and energy storage power stations. Welding metal still has good comprehensive mechanical properties under the work condition of minus 60 DEG C, and the safety and reliability of welded joints in high and cold regions are improved. The welded rod preparation method is feasible in process, and production and manufacturing can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of electrode development, and in particular relates to an 800MPa low-alloy high-strength steel electrode for hydropower. Background technique [0002] With the advancement of smelting and controlled rolling technology, the strength level of low-alloy high-strength steel has been able to reach above 1100MPa. However, in large-scale hydroelectric generating units, the components are bulky and require high thickness and size of steel plates. Therefore, in large power stations such as the Three Gorges and Xiluodu, 600MPa low-alloy high-strength steel is mainly used. With the continuous improvement of unit capacity and the rapid development of pumped storage power stations, there is a demand for higher-strength steel applications. 800MPa-grade steel plates have been used in the pressure pipes of domestic pumped storage units such as Hohhot, Baoquan, and Ming Tombs, and in the manufacture of volutes in Ertan Powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3053B23K35/40
Inventor 朱藤辉蔡力生李达罗涛张敏敏刘丽
Owner SICHUAN XIYE NEW MATERIAL
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