CN107378311A

CN107378311A - A kind of high tenacity for 460MPa steel is seamless submerged arc flux-cored wire

Info

Publication number: CN107378311A
Application number: CN201710720346.2A
Authority: CN
Inventors: 朱官朋; 亢天佑; 徐飞; 方子春
Original assignee: LUOYANG SHUANGRUI SPECIAL ALLOY MATERIAL Co Ltd
Current assignee: 725th Research Institute of CSIC
Priority date: 2017-08-21
Filing date: 2017-08-21
Publication date: 2017-11-24
Anticipated expiration: 2037-08-21
Also published as: CN107378311B

Abstract

The present invention relates to a kind of seamless submerged arc flux-cored wire of the high tenacity for 460MPa steel, is made up of the mild-carbon steel strip and internal medicine core powder of periphery, the mass percent of each component is in the medicine core powder：Nickel powder 8% 13%, molybdenum-iron 0.5% 1.5%, manganese metal 12% 20%, rare earth ferrosilicon 3% 7%, ferrotianium 2% 5%, ferro-boron 1% 3%, cryolite 0.5% 1%, fluorite 1% 2%, surplus is iron powder and inevitable impurity；The seamless submerged arc flux-cored wire of the present invention coordinates with fluorine alkaline type sintered flux SR SJ613, and 40 DEG C of Charpy-V impact powers reach more than 110J, diffusible hydrogen≤5ml/100g, the welding available for 460MPa steel.

Description

A kind of high tenacity for 460MPa steel is seamless submerged arc flux-cored wire

Technical field

The present invention relates to field of welding material, the specifically a kind of seamless submerged arc medicine core of high tenacity for 460MPa steel Welding wire.

Background technology

Offshore engineering structure Service Environment is severe, and steel plate thickness of slab used is general thicker, and constraint stress is big during welding, cold crack Sensitiveness is larger, thus proposes higher requirement, it is necessary to possess good low-temperature flexibility and good crack resistance welding material. When 460MPa levels or higher intensity steel plate weld, the diffusible hydrogen content of Resistance of Weld Metal requires harsher, external automatic submerged arc welding When welding some important features, typically typically used with welding wire using seamless submerged arc flux-cored wire, current domestic automatic submerged arc welding Solid welding wire.And seamless submerged arc flux-cored wire has advantages below compared with solid welding wire：（1）Arc stability, spreadability are good, with Mother metal fusion character is good, the defects of being less prone to incomplete fusion, undercut and slag inclusion, is particularly suitable for the welding of cut deal；（2）Composition adjustment Convenient, delivery cycle is short, advantage of lower cost, and comprehensive mechanical property is excellent.Seamless submerged arc flux-cored wire and seamed cored wire Compare, medicinal powder is nonhygroscopic, and diffusible hydrogen is low, convenient storage.

In the prior art, there is the seamless submerged arc flux-cored wire for yield strength 550MPa steel, its yield strength is more than 550MPa, tensile strength are more than 670MPa, are adapted to the welding of 550MPa level high-strength steel；There is the nothing for yield strength 690MPa steel Submerged arc flux-cored wire is stitched, its yield strength is more than 690MPa, and tensile strength is more than 770MPa, is adapted to the weldering of 690MPa level high-strength steel Connect.

At present, not available for the seamless submerged arc flux-cored wire and phase that yield strength is the welding of 460MPa high-strength steel inside the Pass Hold.

The content of the invention

It is an object of the invention to provide a kind of seamless submerged arc flux-cored wire of the high tenacity for 460MPa steel.

In order to solve the above technical problems, the technical solution adopted by the present invention is：

A kind of high tenacity for 460MPa steel is seamless submerged arc flux-cored wire, mild-carbon steel strip and internal medicine core powder group by periphery Into the mass percent of each component is in the medicine core powder：It is nickel powder 8%-13%, molybdenum-iron 0.5%-1.5%, manganese metal 12%-20%, dilute Native ferrosilicon 3%-7%, ferrotianium 2%-5%, ferro-boron 1%-3%, cryolite 0.5%-1%, fluorite 1%-2%, surplus are iron powder and can not kept away The impurity exempted from.

The medicine core powder accounts for the 9%-15% of welding wire gross mass.

A diameter of 3.2mm, 4.0mm or 5.0mm of the welding wire.

The mass ratio of the Ti and B are 2.5-4.

The mass percent of each component is in the medicine core powder：Nickel powder 11%, molybdenum-iron 0.9%, manganese metal 15%, rare earth ferrosilicon 5%th, ferrotianium 3.5%, ferro-boron 3%, cryolite 0.7%, fluorite 1.5%, surplus are iron powder and inevitable impurity.

The mass percent of each component is in the medicine core powder：Nickel powder 8%, molybdenum-iron 0.5%, manganese metal 12%, rare earth ferrosilicon 3%th, ferrotianium 5%, ferro-boron 3%, cryolite 1%, fluorite 2%, surplus are iron powder and inevitable impurity.

The mass percent of each component is in the medicine core powder：Nickel powder 13%, molybdenum-iron 1.5%, manganese metal 20%, rare earth ferrosilicon 7%th, ferrotianium 2%, ferro-boron 1%, cryolite 0.5%, fluorite 1%, surplus are iron powder and inevitable impurity.

Beneficial effects of the present invention：

It is seamless flux-cored wire provided by the present invention for the seamless submerged arc flux-cored wire of high tenacity of 460MPa steel, anti-moisture absorption By force, the diffusible hydrogen content of weld metal is advantageously reduced；The seamless submerged arc flux-cored wire of the present invention and fluorine alkaline type sintered flux SR- SJ613 coordinates, and -40 DEG C of Charpy-V impact powers reach more than 110J, diffusible hydrogen≤5ml/100g, the welding available for 460MPa steel； Nickel powder is added in medicine core powder, the low-temperature flexibility and tensile strength of weld metal can be improved；Molybdenum-iron is added in medicine core powder can improve weldering Stitch the tensile strength of metal；Adding manganese metal in medicine core powder can be with deoxidation, while can improve the tensile strength of weld metal, adds Enter amount it is too low when deoxidation deficiency easily produce stomata, but the plasticity and toughness of weld seam will be significantly reduced during manganese metal too high levels, The addition control of manganese metal is optimal in 12%-20%；, adding rare earth ferrosilicon in medicine core powder can deoxidation.Si and Mn combined deoxidations, Most of deoxidation products is set to enter slag, while rare earth element refines the residual inclusion size in weld metal, reaches folder The purpose that debris is modified, promotion organization refinement；In medicine core powder add ferrotianium can deoxidation, can also improve field trash chemistry into Point, the easy forming core acicular ferrite of field trash containing Ti, improve low-temperature flexibility；Titanyl compound can form stronger hydrogen trap, energy Solidify substantial amounts of hydrogen, so as to effectively reduce the content of deposited metal diffusible hydrogen, the addition control of ferrotianium is optimal in 2%-5%；Medicine Add ferro-boron in core powder, the Ti synergy in appropriate B and weld seam can reach the effect of toughening weld metal, Ti in weld seam It is optimal in 2.5-4 with B ratio Ti/B controls；Cryolite is added in medicine core powder, stable electric arc can be played a part of, dropped simultaneously The diffusible hydrogen of low weld metal；Fluorite is added in medicine core powder, can effectively reduce the diffusible hydrogen of weld metal.

Embodiment

With reference to embodiment, the present invention is further elaborated.

A kind of high tenacity for 460MPa steel is seamless submerged arc flux-cored wire, mild-carbon steel strip and internal medicine core by periphery Powder forms, and the mass percent of each component is in the medicine core powder：Nickel powder 8%-13%, molybdenum-iron 0.5%-1.5%, manganese metal 12%- 20%th, rare earth ferrosilicon 3%-7%, ferrotianium 2%-5%, ferro-boron 1%-3%, Ti/B 2.5-4, cryolite 0.5%-1%, fluorite 1%-2%, Surplus is iron powder and inevitable impurity.

Embodiment 1 ~ 5 is to be adapted to the seamless submerged arc flux-cored wire of 460MPa steel high tenacity.The filling rate of embodiment 1 is 9.5%, gage of wire 3.2mm.The filling rate of embodiment 2 is 12%, gage of wire 4.0mm.The filling rate of embodiment 3 is 14%, weldering Silk diameter 5.0mm.The composition of medicine core powder is as shown in table 1 used in embodiment 1 ~ 5.

The chemical composition of the medicine core powder of the embodiment of the present invention of table 1（Mass fraction, %）

Implementation result example

Three kinds of welding wires obtained above and SR-SJ613 solder flux are coordinated, provides, enters according to national standard GB/T 5118-2012 standards The analysis of row deposited metal composition, deposited metal Mechanics Performance Testing and deposited metal diffusible hydrogen content measure.With Φ 4.0mm Exemplified by welding wire, welding condition is：Source of welding current DC reverse connection, welding current 550-600A, weldingvoltage 30-35V, between road 100-200 DEG C of temperature, test result is as shown in Table 2-4.

The deposited metal composition of the embodiment of the present invention of table 2（Mass fraction, %）

The deposited metal mechanical property of the embodiment of the present invention of table 3

The deposited metal diffusible hydrogen ml/100g of the embodiment of the present invention of table 4

From result above, seamless submerged arc flux-cored wire of the invention, coordinate with fluorine alkaline type sintered flux SR-SJ613, welding Technique is good, good mechanical performance, especially excellent in low temperature toughness, and diffusible hydrogen is low, high-strength with 460MPa available for ocean engineering The welding of steel plate.

Claims

A kind of 1. high tenacity for 460MPa steel is seamless submerged arc flux-cored wire, it is characterised in that：By periphery mild-carbon steel strip and Internal medicine core powder forms, and the mass percent of each component is in the medicine core powder：Nickel powder 8%-13%, molybdenum-iron 0.5%-1.5%, gold Belong to manganese 12%-20%, rare earth ferrosilicon 3%-7%, ferrotianium 2%-5%, ferro-boron 1%-3%, cryolite 0.5%-1%, fluorite 1%-2%, surplus For iron powder and inevitable impurity.
2. it is used for the seamless submerged arc flux-cored wire of high tenacity of 460MPa steel as claimed in claim 1, it is characterised in that：The medicine Core powder accounts for the 9%-15% of welding wire gross mass.
3. it is used for the seamless submerged arc flux-cored wire of high tenacity of 460MPa steel as claimed in claim 1, it is characterised in that：The weldering A diameter of 3.2mm, 4.0mm or 5.0mm of silk.
4. it is used for the seamless submerged arc flux-cored wire of high tenacity of 460MPa steel as claimed in claim 1, it is characterised in that：The Ti Mass ratio with B is 2.5-4.
5. it is used for the seamless submerged arc flux-cored wire of high tenacity of 460MPa steel as claimed in claim 1, it is characterised in that：The medicine The mass percent of each component is in core powder：Nickel powder 11%, molybdenum-iron 0.9%, manganese metal 15%, rare earth ferrosilicon 5%, ferrotianium 3.5%, boron Iron 3%, cryolite 0.7%, fluorite 1.5%, surplus are iron powder and inevitable impurity.
6. it is used for the seamless submerged arc flux-cored wire of high tenacity of 460MPa steel as claimed in claim 1, it is characterised in that：The medicine The mass percent of each component is in core powder：Nickel powder 8%, molybdenum-iron 0.5%, manganese metal 12%, rare earth ferrosilicon 3%, ferrotianium 5%, ferro-boron 3%th, cryolite 1%, fluorite 2%, surplus are iron powder and inevitable impurity.
7. it is used for the seamless submerged arc flux-cored wire of high tenacity of 460MPa steel as claimed in claim 1, it is characterised in that：The medicine The mass percent of each component is in core powder：Nickel powder 13%, molybdenum-iron 1.5%, manganese metal 20%, rare earth ferrosilicon 7%, ferrotianium 2%, ferro-boron 1%th, cryolite 0.5%, fluorite 1%, surplus are iron powder and inevitable impurity.