CN102085603B

CN102085603B - Fluorine-base type sintered flux used for reducing sulfur and phosphorus contents of welding joint and used in submerged arc hardfacing

Info

Publication number: CN102085603B
Application number: CN200910242004XA
Authority: CN
Inventors: 王立志; 王清宝; 刘景凤; 石立鹏; 郑代龙; 白波
Original assignee: MCC WELDING TECHNOLOGY Co Ltd; Central Research Institute of Building and Construction Co Ltd MCC Group
Current assignee: Central Research Institute of Building and Construction Co Ltd MCC Group; China Jingye Engineering Corp Ltd
Priority date: 2009-12-02
Filing date: 2009-12-02
Publication date: 2012-11-28
Anticipated expiration: 2029-12-02
Also published as: CN102085603A

Abstract

The invention discloses a fluorine-base type sintered flux used for reducing sulfur and phosphorus contents of a welding joint and used in submerged arc hardfacing, relating to the flux technology. The fluorine-base type sintered flux comprises the following components in percent by weight: 30-35 percent of magnesium oxide (MgO), 16-21 percent of calcium fluoride (CaF2), 17-22 percent of aluminium oxide (Al2O3), 14-19 percent of silica (SiO2), 3-5 percent of manganese oxide (MnO), less than 3 percent of ferrous oxide (FeO), 1-3 percent of rare earth fluoride compound additive, 0.3-0.6 percent of sodium oxide (Na2O), 0.15-0.3 percent of potassium oxide (K2O), not more than 0.03 percent of sulphur (S) and not more than 0.04 percent of phosphorus (P).Through controlling the basicity range of the flux and adding the rare earth fluoride compound additive, the oxygen content, the sulfur and phosphorus contents and the impurities in the flux are reduced, and the purity of weld metal is ensured, and higher flexibility and cracking resistance are obtained by hardfacing deposited metal.

Description

Reduce the fluorine alkaline type sintered flux that weld seam sulphur phosphorus content is used for the submerged arc hardfacing

Technical field

The present invention relates to the solder flux technical field, is the fluorine alkaline type sintered flux that a kind of effective reduction weld metal sulphur phosphorus content is used for the submerged arc hardfacing.

Background technology

Industries such as metallurgy, mine, machinery, building materials and Coal Transport all need be used a large amount of high-abrasive materials.In order to improve the service life of wear-resisting spare part, satisfy the hard material of above-mentioned performance usually at its surface overlaying one deck, the service life of improving spare part.Automatic submerged-arc bead welding is advantages such as automaticity is higher, deposition rate very fast, forming, has become the most extensively recovery technique of built-up welding sector application.Because it is the resurfacing welding material of these spare parts requires hardness high, and needs continuous built-up welding, strict especially to the requirement of solder flux; Pinch roll surface like metallurgy industry should have performances such as better hardness, crack property, thermal fatigue resistance, and when the built-up welding pinch roll, bead-welding technology requires interlayer temperature to be higher than 300 ℃; Performances such as continuous built-up welding; Require solder flux to have the good removability of slag and mouldability, welding bead surface flawless after the built-up welding, characteristics such as obdurability is good.Adopt existing solder flux can not well satisfy the welding requirements of this type of hardfacing.

Summary of the invention

The objective of the invention is deficiency to prior art; A kind of fluorine alkaline type sintered flux that weld seam sulphur phosphorus content is used for the submerged arc hardfacing that reduces is provided, and it is arc stability in welding process, and the high temperature deslag performance is good; Appearance of weld is attractive in appearance; Transitions smooth can be used with multiple hardfacing welding wire, when taking into account wearability, has toughness and crack resistance preferably.

For achieving the above object, the present invention solves the technical scheme that its technical problem takes and is:

A kind ofly reduce the fluorine alkaline type sintered flux that weld seam sulphur phosphorus content is used for the submerged arc hardfacing, its component is magnesia (MgO) 30～35, calcirm-fluoride (CaF by weight percentage ₂) 16～21, alundum (Al (Al ₂O ₃) 17～22, silica (SiO ₂) 14～19, manganese oxide (MnO) 3～5, oxidation industry iron (FeO)＜3, rare earth fluoride compound additive 1～3, sodium oxide molybdena (Na ₂O) 0.3～0.6, potassium oxide (K ₂O) 0.15～0.3, sulphur (S)≤0.03, phosphorus (P)≤0.04.

Described fluorine alkaline type sintered flux, its basicity (B _IIW) scope is 2.1～2.5.

Described fluorine alkaline type sintered flux, its said rare earth fluoride compound additive by weight percentage, consists of: rare earth fluoride 42%, calcium oxide 33% and calcium-silicon 25%.

Described fluorine alkaline type sintered flux; It is characterized in that: said, rare earth fluoride, by weight percentage; Comprise: lanthanum (La) 15.1%, cerium (Ce) 36.1%, praseodymium (Pr) 3.9%, rubidium (Nd) 14.4%, fluorine (F) 27.7%; Calcium-silicon by weight percentage, comprising: calcium (Ca) 412%, silicon (Si) 48.7%.

Advantage that the present invention has and effect:

1, the present invention makes welding slag have appropriate melting point, viscosity, surface tension etc. through optimizing the solder flux composition, and solder flux has arc stability, and the high temperature deslag performance is good, and appearance of weld is attractive in appearance, the comprehensive welding technological properties that transitions smooth etc. are good.

2, the present invention adds the rare earth fluoride compound additive through the basicity scope of control solder flux, reduces oxygen and sulphur phosphorus content and impurity in the solder flux, guarantees the degree of purity of weld metal, improves the toughness and the crack resistance of weld metal.

3, the present invention and ZY-YJ101N-S bead welding wire are used, and are used for the build-up welding continuous-casting roller, and the deposited metal summer is satisfied the instructions for use of continuous casting roller than impact absorbing energy Akv:8～15J.

The specific embodiment

The fluorine alkaline type sintered flux of a kind of effective reduction weld metal sulphur phosphorus content of the present invention, its major technique means that improve weld metal toughness and crack resistance have: the basicity (B of control solder flux _IIW) scope is 2.1～2.5; Add rare earth fluoride compound additive deoxidization desulfuration phosphorus; Reduce the objectionable impurities that brings in the raw material as far as possible, guarantee the degree of purity of weld metal.Viscosity, surface tension and fusing point etc. through adjustment solder flux slag improve appearance of weld and high temperature deslag performance, guarantee the face of weld quality thereby improve the submerged arc overlay welding processing performance.

Embodiment one:

1, solder flux component (wt%): MgO 34, CaF ₂20, Al ₂O ₃20, SiO ₂18, MnO3, FeO 1.28, rare earth fluoride compound additive 3, Na ₂O 0.453, K ₂O 0.213, and S 0.024, and P 0.030.

2, preparation method: carry out proportioning according to prescription and weigh, carry out dried stir about 20～30min then, the back that stirs adds the potassium sodium mixing water glass of dry powder weight about 18～20%; Stir, the wet-milling that stirs is sent into comminutor and is carried out granulation, after the granulation; Solder flux in drying oven 250 ℃ the oven dry about 1 hour; Solder flux after the oven dry sieves, and the solder flux in the screening place standard particle size scope is sent into sintering furnace and carried out sintering, 850 ℃ of sintering temperatures; About 1 hour of sintering, the packing of checking and sieve after the cooling of coming out of the stove.

3, the main chemical compositions of deposited metal after the cooperation ZY-YJ101N-S built-up welding.

The main chemical compositions (wt%) of deposited metal is as shown in table 1 after the embodiment 1 cooperation ZY-YJ101N-S built-up welding:

Table 1

C	Cr	S	P	N
					0.04	12.9	0.008	0.02	0.09

Embodiment two:

1, solder flux component (wt%): MgO 34, CaF ₂20, Al ₂O ₃20, SiO ₂18, MnO 3, and FeO 1.29, rare earth fluoride compound additive 3, Na ₂O 0.435, K ₂O 0.218, and S 0.026, and P 0.031.

2, the preparation method is identical with embodiment one.

Embodiment three:

1, solder flux component (wt%): MgO 32, CaF ₂21, Al ₂O ₃22, SiO ₂18, MnO 3, and FeO 1.35, rare earth fluoride compound additive 2, Na ₂O 0.397, K ₂O 0.198, and S 0.020, and P 0.035.

2, the preparation method is identical with embodiment one.

Solder flux of the present invention arc stability in welding process, the high temperature deslag performance is good, and appearance of weld is attractive in appearance; Transitions smooth; Can be used with multiple hardfacing welding wire,, when taking into account wearability, have toughness and crack resistance preferably as cooperating ZY-YJ101N-S welding wire built-up welding continuous casting roller.

Comparative Examples:

Solder flux adopts commercially available SJ400.

The main chemical compositions (wt%) of deposited metal is as shown in table 2 behind the Comparative Examples cooperation ZY-YJ101N-S welding wire built-up welding:

Table 2

C	Cr	S	P	N
					0.041	13	0.02	0.029	0.087

See that from table 1, table 2 after contrasting commercially available SJ400 and cooperating the ZY-YJ101N-S welding wire built-up welding, deposited metal S, the P content of solder flux of the present invention effectively reduce.

Three embodiment and Comparative Examples are after built-up welding (cooperating the ZY-YJ101N-S welding wire) test, and its results of property contrast is as shown in table 3:

Table 3

Performance	As-welded average hardness (HRC)	Ballistic work (J)
			1#	?45	11.5
2#	?46	11.1
			3#	?46	10.4
Comparative Examples	?44	8

Claims

1. one kind is reduced the fluorine alkaline type sintered flux that weld seam sulphur phosphorus content is used for the submerged arc hardfacing, it is characterized in that: its component is magnesia 30～35, calcirm-fluoride 16～21 by weight percentage; Alundum (Al 17～22, silica 1 4～19, manganese oxide 3～5; Ferrous oxide＜3, rare earth fluoride compound additive 1～3, sodium oxide molybdena 0.3～0.6; Potassium oxide 0.15～0.3, sulphur≤0.03, phosphorus≤0.04;

Wherein, said rare earth fluoride compound additive by weight percentage, consists of: rare earth fluoride 42%, calcium oxide 33% and calcium-silicon 25%; Said rare earth fluoride by weight percentage, comprising: lanthanum 15.1%, cerium 36.1%, praseodymium 3.9%, rubidium 14.4%, fluorine 27.7%; Calcium-silicon by weight percentage, comprising: calcium 41.2%, silicon 48.7%.

2. fluorine alkaline type sintered flux as claimed in claim 1 is characterized in that: basicity B _{II W}Scope is 2.1～2.5.