CN110280925A

CN110280925A - A kind of welding wire for submerged-arc welding for high building structure refractory steel

Info

Publication number: CN110280925A
Application number: CN201910638443.6A
Authority: CN
Inventors: 孟令明; 邓伟; 楚觉非; 崔强; 陈林恒; 唐春霞; 李松
Original assignee: Nanjing Iron and Steel Co Ltd
Current assignee: Nanjing Iron and Steel Co Ltd
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2019-09-27
Anticipated expiration: 2039-07-16
Also published as: CN110280925B

Abstract

The invention discloses a kind of welding wire for submerged-arc welding for high building structure refractory steel, the chemical element weight percent content of the welding wire for submerged-arc welding is C:0.03~0.16%；Si:0.10~0.20%；Mn:0.40~1.00%；Ni:0.20~0.50%；Mo:0.05~0.20%；Ti:0.01~0.05%；B:0.0005~0.002%；Nb:0.01~0.04%；Al:0.01~0.04%；V:0.01~0.04%；N:0.001~0.004%；Remaining is Fe and inevitable impurity element.Welding wire for submerged-arc welding ingredient of the invention is simple, and the deposited metal and welding point for welding formation have excellent comprehensive mechanical property, higher high temperature tensile properties and higher low-temperature impact work, at low cost, has a good application prospect.

Description

A kind of welding wire for submerged-arc welding for high building structure refractory steel

Technical field

The present invention relates to field of welding material, and in particular to a kind of welding wire for submerged-arc welding for high building structure refractory steel, More particularly to a kind of welding wire for submerged-arc welding for 345MPa grades of high building structure refractory steels of yield strength.

Background technique

With the fast development of skyscraper, based on safety, economy, handsome in appearance, space utilization rate etc. It is required that refractory steel is high-strength with its, light weight, fire resisting, the antidetonation and advantages such as pollution-free will become generation compared to for fireproof coating The preferred material of various countries, boundary heavy construction structure.

Refractory steel ordinary circumstance is to carry at normal temperature, so it should have higher intensity at normal temperature, however, building Building structure in use, will inevitably bear the disasters such as earthquake, fire and carry out the work such as interim impact, high temperature, distortion With, therefore refractory steel should have excellent impact flexibility and elevated temperature strength.Refractory steel is encountering 600 DEG C of fire or so high temperature When keeping 3h or so, intensity is not less than the 2/3 of its room temperature design strength, to guarantee the safety of building structure.In addition, fire resisting Steel should also have the performances such as good weldability, shock resistance and processing forming.

Since in construction steel structure is constructed, the combination connection of steel member will use welding technique on a large scale, it is based on The requirement of steel construction safety factor, the welding of refractory steel are also that it develops and uses important content, are closed according in Fire-resistant Steels Used in Buildings Gold dollar cellulose content and mechanical property match corresponding welding material, so that weld seam be made to obtain excellent comprehensive mechanical property. Its mechanical property, especially high-temperature behavior similarly need to reach the performance requirement of Fire-resistant Steels Used in Buildings, that is, are encountering fire 600 DEG C or so high temperature when keeping 3h or so, intensity is not less than the security intensity of its structure design, to guarantee the safety of building structure Property.

Building structure refractory steel welding wire generally has reached its elevated temperature strength using the design method of high Mo, however a large amount of Mo The addition of element inevitably considerably increases the cost of material.Chinese patent CN108857140 and CN108941972 disclose welding wire 0.20%~0.59% Mo element is added in ingredient；Chinese patent CN108788518 is disclosed in gas protecting welding wire It is added to 0.60%~1.00% Mo element；0.25%~0.60% Mo member is added in Chinese patent CN102717206 Element；It is strong to reach excellent drawing by high temperature that these are added to the Mo element of more mass fraction in welding wire about refractory steel Degree, but there is a problem of that processing cost is high.

Summary of the invention

Goal of the invention: the present invention proposes a kind of submerged-arc welding for 345MPa grades of high building structure refractory steels of yield strength Silk, welds the deposited metal to be formed and welding point room temperature intensity with higher and elevated temperature strength using the welding wire, has simultaneously There is preferable low-temperature flexibility.

Technical solution: the technical scheme adopted by the invention is that a kind of submerged-arc welding for high building structure refractory steel Silk, the chemical element weight percent content of the welding wire for submerged-arc welding are C:0.03~0.16%；Si:0.10~0.20%；Mn: 0.40~1.00%；Ni:0.20~0.50%；Mo:0.05~0.20%；Ti:0.01~0.05%；B:0.0005~ 0.002%；Nb:0.01~0.04%；Al:0.01~0.04%；V:0.01~0.04%；N:0.001~0.004%；Remaining For Fe and inevitable impurity element.

Wherein, chemical element N, C energy and microalloy element Nb, V, Ti form the second phase；Further, described second It is mutually carbide or nitride, plays precipitation strength.

Wherein, the deposited metal room temperature tensile tensile strength that the welding wire for submerged-arc welding is formed is 502~551Mpa, drawing by high temperature Yield strength is 240~282MPa, and -40 DEG C of low-temperature impact toughness with higher.

Wherein, it after the welding wire for submerged-arc welding welds yield strength 345MPa rank refractory steel, is formed by welding and connects Head room temperature tensile tensile strength is 511~571Mpa, and drawing by high temperature yield strength is 241~290MPa, and -40 DEG C of heat affected area Low-temperature impact toughness is more excellent.

Specifically, the N element that joined 0.001~0.004% in welding wire for submerged-arc welding of the invention, only it is added to 0.05%~ 0.20% Mo element, wherein N element and C element can be capable of forming the second phase carbon or nitridation with microalloy element Nb, V, Ti Object plays the role of precipitation strength, and the microalloy element being solid-solution in matrix under 600 DEG C of high temperature can be precipitated, and further increases resistance to The high-temperature behavior of fiery steel, to reach excellent high temperature tensile properties.

The utility model has the advantages that welding wire for submerged-arc welding ingredient of the invention is simple, the deposited metal and welding point for welding formation are all had Excellent comprehensive mechanical property, higher high temperature tensile properties and higher low-temperature impact work, it is at low cost, have and answers well Use prospect.

Specific embodiment

Below with reference to embodiment, further description of the technical solution of the present invention.

Embodiment 1

The preparation of welding wire for submerged-arc welding uses existing equipment and technology, and chemical component mass percent is shown in Table 1, and welding is with plate Q345FRE refractory steel, with a thickness of 40mm, thermal weld stress is 15KJ/cm and 75KJ/cm；Welding groove size, sample position and Test method etc. is executed according to national standard GB/T 12470, and the judgement of test result is executed according to national standard GB/T 28415-2012, By cooperating welding to obtain the deposited metal with excellent combination mechanical property with XUN121 solder flux.

Embodiment 2

The preparation of welding wire for submerged-arc welding uses existing equipment and technology, and chemical component mass percent is shown in Table 1, welding procedure mistake Journey is the same as embodiment 1.

Embodiment 3

The mechanical property for detecting deposited metal and welding point in embodiment 1 to 3, the results are shown in Table 2 and table 3.

1 welding wire for submerged-arc welding chemical component mass percent (wt.%) surplus Fe of table

2 deposited metal mechanical property of table

3 welding joint mechanical property of table

From table 2 and table 3 as can be seen that deposited metal and welding point that welding wire for submerged-arc welding of the invention is formed are with higher Low-temperature impact toughness；Its high-temperature yield strength reaches 2/3 of room temperature or more, can satisfy 345MPa grades of skyscrapers of yield strength The welding process requirement of structure fire resistance steel.

Claims

1. a kind of welding wire for submerged-arc welding for high building structure refractory steel, it is characterised in that: the chemical element of the welding wire for submerged-arc welding Weight percent content is C:0.03~0.16%；Si:0.10~0.20%；Mn:0.40~1.00%；Ni:0.20~ 0.50%；Mo:0.05~0.20%；Ti:0.01~0.05%；B:0.0005~0.002%；Nb:0.01~0.04%；Al: 0.01~0.04%；V:0.01~0.04%；N:0.001~0.004%；Remaining is Fe and inevitable impurity element.

2. a kind of welding wire for submerged-arc welding for high building structure refractory steel according to claim 1, it is characterised in that: described Chemical element N, C energy and microalloy element Nb, V, Ti form the second phase.

3. a kind of welding wire for submerged-arc welding for high building structure refractory steel according to claim 2, it is characterised in that: described Second phase is carbide or nitride, plays precipitation strength.

4. a kind of welding wire for submerged-arc welding for high building structure refractory steel according to claim 1, it is characterised in that: described Welding wire for submerged-arc welding formed deposited metal room temperature tensile tensile strength be 502~551Mpa, drawing by high temperature yield strength be 240~ 282MPa。

5. a kind of welding wire for submerged-arc welding for high building structure refractory steel according to claim 1, it is characterised in that: described After welding wire for submerged-arc welding welds yield strength 345MPa rank refractory steel, it is formed by welding point room temperature tensile tensile strength For 511~571Mpa, drawing by high temperature yield strength is 241~290MPa.