CN-122007565-A - Alloy powder for improving weld strength of ultra-high strength steel, preparation method thereof and welding method

CN122007565ACN 122007565 ACN122007565 ACN 122007565ACN-122007565-A

Abstract

The application discloses alloy powder for improving the weld strength of ultra-high strength steel, a preparation method thereof and a welding method. The preparation method comprises the steps of providing corresponding content of element components according to component requirements of alloy powder for welding the ultra-high-strength steel weld joints, mixing the element components to obtain powder mixture, adding adhesive into the powder mixture to obtain bonding mixture, drying the bonding mixture at the temperature of 360-420 ℃ to form bonding mixture blocks, crushing and screening the bonding mixture blocks to obtain the alloy powder with the required particle size and capable of improving the ultra-high-strength steel weld joints. According to the preparation method of the alloy powder for improving the strength of the ultra-high-strength steel weld joint, the alloy powder can be used for transferring alloy elements to the weld joint, and the alloy powder is combined with a welding wire to improve the overall strength of the ultra-high-strength steel weld joint, so that materials formed in the weld joint are matched with an ultra-high-strength steel base metal.

Inventors

ZHANG YONGLIN
LIANG WEN
GUO QINGXIAN
XU BO
ZHOU JIANFENG
Liang yuandong
LIANG LIANG
LIU XUHUI
LIU NING
TANG YING
XIAO AIDA
ZENG WEIMIN
YU TAO
YU QIANG

Assignees

湖南华菱涟钢特种新材料有限公司
湖南华菱涟源钢铁有限公司

Dates

Publication Date: 20260512
Application Date: 20260318

Claims (10)

1. The preparation method of the alloy powder for improving the strength of the ultra-high strength steel weld joint is characterized by comprising the following steps: Providing corresponding content of element components according to the component requirements of the alloy powder for welding the ultra-high strength steel weld; mixing the element components to obtain a powder mixture; Adding an adhesive into the powder mixture for mixing to obtain an adhesive mixture; drying the bonding mixture at the temperature of 360-420 ℃ to form a bonding mixture group, so as to obtain a bonding mixture group; crushing and screening the bonded mixture to obtain alloy powder with required particle size and capable of improving the strength of the ultra-high strength steel weld joint.
2. The method for preparing alloy powder for improving the weld strength of ultra-high strength steel according to claim 1, wherein the elemental components include components ：C＜0.05wt.%,Si 0.05wt.%~0.2wt.%,Mn 0.5wt.%~0.6wt.%,Cr 0.51wt.%~0.61wt.%,Mo 0.11wt.%~0.26wt.%,Ni 0.5wt.%~0.8wt.%,V 0.02wt.%~0.05wt.%,Nb 0.02wt.%~0.07wt.%,Ti 0.02wt.%~0.04wt.%,P、S in the following amounts of <0.005wt.%, balance Fe; Optionally, in the step of providing the element components with the corresponding content, the average particle size of the element components used is 200-500 meshes.
3. The method for producing an alloy powder for improving the weld strength of an ultra-high strength steel according to claim 1, wherein the binder used in the step of adding and mixing the powder mixture is one or a mixture of two or more of an inorganic binder and an organic binder.
4. The method for preparing the alloy powder for improving the weld strength of the ultra-high strength steel according to claim 3, wherein the inorganic adhesive is one or a combination of two of a sodium silicate solution and a potassium silicate solution, wherein the modulus of the sodium silicate solution and/or the potassium silicate solution is 2.4-2.8, and/or, The organic adhesive is selected from one or more of carboxymethyl cellulose, polyvinyl butyral, polyethylene glycol and acrylic resin.
5. The method for preparing the alloy powder for improving the weld strength of the ultra-high-strength steel according to claim 4, wherein the mass ratio of the inorganic adhesive to the powder mixture is (10% -15%) (85% -90%); Optionally, the mass ratio of the organic adhesive to the powder mixture is (7.5% -15%) (85% -92.5%).
6. The method for preparing alloy powder for improving the weld strength of ultra-high strength steel according to claim 1, wherein in the step of crushing and screening the bonded mixture, a 30-60 mesh sieve is used for screening the crushed bonded mixture to obtain the alloy powder for improving the weld strength of ultra-high strength steel.
7. The alloy powder for welding the ultra-high-strength steel weld joint, which is characterized by being prepared by a preparation method of the alloy powder for improving the strength of the ultra-high-strength steel weld joint according to any one of claims 1 to 6, wherein the alloy powder for welding the ultra-high-strength steel weld joint comprises the following components ：C＜0.05wt.%,Si 0.05wt.%~0.2wt.%,Mn 0.5wt.%~0.6wt.%,Cr 0.51wt.%~0.61wt.%,Mo 0.11wt.%~0.26wt.%,Ni 0.5wt.%~0.8wt.%,V 0.02wt.%~0.05wt.%,Nb 0.02wt.%~0.07wt.%,Ti 0.02wt.%~0.04wt.%,P、S in percentage by mass, wherein the content is less than 0.005 weight percent, and the balance is Fe; Optionally, the average grain size of the alloy powder for improving the welding seam strength of the ultra-high strength steel is 0.25-0.6 mm.
8. A welding method, characterized in that the welding treatment is performed using the alloy powder for ultra-high-strength steel bead welding according to claim 7, comprising: The arc welding method comprises the steps of taking a consumable electrode waste inert gas shielded welding arc as a welding heat source, and taking an argon-rich mixed gas as a welding shielding gas, wherein the volume ratio of CO 2 in the argon-rich mixed gas is 3% -4%, or the volume ratio of O 2 in the argon-rich mixed gas is 1.5% -2.5%, and the balance is argon; And then using the welding wire and alloy powder for welding the ultra-high-strength steel weld joint as welding materials, carrying out welding treatment on a filling weld bead, and finally carrying out welding treatment on a cover weld bead of the weld joint by using the welding wire.
9. The welding method according to claim 8, wherein in the steps of welding the backing pass of the weld bead with the wire, and finally welding the cap pass of the weld bead with the wire, the welding voltages U are 13V to 27V, the welding currents I are 120a to 240a, and the welding speeds V 0 satisfy the following formula (1): V 0 =0.048×U×I/E 0 (1), Wherein E 0 is a welding heat input, and E 0 is determined according to the following relation (2): E 0 =k 0 ×δ (2), Wherein k 0 is a plate thickness coefficient, the value is 1.1-1.5, and delta is the plate thickness.
10. The welding method according to claim 8, wherein in the step of welding the filler bead using the welding wire and the alloy powder for ultra-high strength steel bead welding as the welding material, the welding voltage U is 13V to 27V, the welding current I is 120a to 240a, and the welding speed V 1 satisfies the following formula (3): V 1 =0.048×U×I/E 1 (3), wherein E 1 is a welding heat input, and E 1 is determined according to the following relation (4): E 1 =k 1 ×δ (4), Wherein k 1 is a plate thickness coefficient, the value is 1.4-1.8, and delta is the plate thickness; h=2.5k 1 -1 (5), h is the spreading thickness of alloy powder for welding the ultra-high strength steel weld; Optionally, in the step of welding the filling weld bead by using the welding wire and the alloy powder for welding the ultra-high strength steel weld bead as welding materials, the filling weld bead can be subjected to multiple welding treatments; optionally, the welding wire comprises the following components ：C 0.08wt.%～0.1wt.%,Si 0.72wt.%～0.85wt.%,Mn 1.65wt.%～1.85wt.%,Cr 0.25wt.%～0.42wt.%,Mo 0.46wt.%～0.58wt.%,Ni 2.0wt.%～2.5wt.%,Nb 0.02wt.%～0.04wt.%,Ti 0.05wt.%～0.09wt.%,Cu 0.11wt.%～0.12wt.%,P≤0.008wt.%、S≤0.008wt.%, in percentage by mass and the balance of Fe; optionally, in the welding process, the flow rate of the argon-rich mixed gas is 18L/min-22L/min.

Description

Alloy powder for improving weld strength of ultra-high strength steel, preparation method thereof and welding method Technical Field The application belongs to the technical field of steel welding materials, and particularly relates to alloy powder for improving the welding seam strength of ultra-high-strength steel, a preparation method thereof and a welding method thereof. Background According to GB/T28909-2012 heat-treated Steel plate for ultra-high Strength Structure, steel with yield Strength of 1030MPa or more belongs to ultra-high-strength Steel. Compared with common high-strength steel, the ultra-high-strength steel has higher strength, can bear larger load in the service process, is an effective means for realizing the light weight of equipment by adopting the ultra-high-strength steel instead of the high-strength steel, and is successfully applied to large-scale equipment in the fields of engineering machinery, port machinery, coal mine machinery and the like, such as products of large-tonnage cranes, ultra-large-tonnage port cranes and the like. According to related reports, at present, a large crane production enterprise in China successfully applies low alloy ultra-high strength steel (national standard Q1300E) with the yield strength of 1300MPa to the production of large tonnage crane booms, and the yield strength of the steel is more than or equal to 1300MPa, and the tensile strength of the steel is more than or equal to 1550MPa. In the application process of the ultra-high strength steel, the ultra-high strength steel can undergo the procedures of cutting, forming, welding, machining and the like. Among them, welding is a very important process, and is one of the most important connection modes of steel structures. In general, the welding needs equal-strength matching, so that the weld joint is ensured to have the bearing capacity consistent with that of the parent metal. However, the welding wire with the highest strength level on the market at present is generally the welding wire meeting the requirements of GB/T39281G 96A4, and the tensile strength is 960-1160 MPa, which is far lower than the tensile strength 1550MPa of the ultra-high strength steel with the yield strength of 1300 MPa. Moreover, since large equipment is limited in size, the weld cannot be heat-treated and strengthened after welding. Therefore, the strength of the existing ultra-high strength steel weld joint is far lower than that of the ultra-high strength steel parent metal, and improvement is needed. Disclosure of Invention The embodiment of the application provides alloy powder for improving the strength of an ultra-high-strength steel weld joint, a preparation method thereof and a welding method thereof. According to the first aspect, the application provides a preparation method of alloy powder for improving the strength of an ultra-high strength steel weld joint, which comprises the steps of providing corresponding content of element components according to component requirements of the alloy powder for ultra-high strength steel weld joint welding, mixing the element components to obtain a powder mixture, adding an adhesive into the powder mixture to obtain an adhesive mixture, drying the adhesive mixture at a temperature of 360-420 ℃ to enable the adhesive mixture to be agglomerated to obtain an adhesive mixture mass, and crushing and screening the adhesive mixture mass to obtain the alloy powder for improving the strength of the ultra-high strength steel weld joint with required particle size. According to an embodiment of the first aspect of the application, the elemental composition comprises the following amounts of composition ：C＜0.05wt.%,Si 0.05wt.%~0.2wt.%,Mn 0.5wt.%~0.6wt.%,Cr 0.51wt.%~0.61wt.%,Mo 0.11wt.%~0.26wt.%,Ni 0.5wt.%~0.8wt.%,V 0.02wt.%~0.05wt.%,Nb 0.02wt.%~0.07wt.%,Ti 0.02wt.%~0.04wt.%,P、S <0.005wt.%, balance Fe. According to an embodiment of the first aspect of the present application, in the step of providing the element components in the respective contents, the average particle diameter of the element components used is 200 mesh to 500 mesh. According to an embodiment of the first aspect of the present application, in the step of mixing the elemental ingredients, the elemental ingredients are powder-sprayed and mixed with blown air to obtain a powder mixture. According to an embodiment of the first aspect of the present application, in the step of adding a binder to the powder mixture, the binder used is one or a mixture of two or more of an inorganic binder and an organic binder. According to an embodiment of the first aspect of the present application, the inorganic binder is selected from one or a combination of two of a sodium silicate solution and a potassium silicate solution, wherein the modulus of the sodium silicate solution and/or the potassium silicate solution is 2.4-2.8. According to an embodiment of the first aspect of the application, the organic binder is selected from one or m