CN109136760B - It is a kind of can heat resistanceheat resistant processing deposited metal - Google Patents
It is a kind of can heat resistanceheat resistant processing deposited metal Download PDFInfo
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- CN109136760B CN109136760B CN201811107568.8A CN201811107568A CN109136760B CN 109136760 B CN109136760 B CN 109136760B CN 201811107568 A CN201811107568 A CN 201811107568A CN 109136760 B CN109136760 B CN 109136760B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Heat Treatment Of Steel (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses it is a kind of can heat resistanceheat resistant processing deposited metal, including following mass percent component: C≤0.05%, Si≤0.18%, Mn0.8~1.8%, S≤0.01%, P≤0.01%, Cu 0.1~0.25%, Cr 0.1~0.25%, Ni 1.0~3.0%, Mo0.5~1.5%, Ti+RE 0.02~0.1%, 0.8≤RE/Ti≤1.2,1.5≤(Ti+RE)/O≤2.5, remaining is Fe and inevitable impurity element.Deposited metal of the present invention can satisfy different heat treatment technique (650 DEG C, 1h；580 DEG C, 4h；620 DEG C, 10h) front and back is provided with stable toughness and tenacity, within the tensile strength of heat treatment state is compared to as-welded decline 15%, within heat treatment state low-temperature impact work is compared to as-welded decline 30%.
Description
Technical field
The present invention relates to a kind of deposited metal, more particularly to it is a kind of can heat resistanceheat resistant processing deposited metal.
Background technique
Post weld heat treatment is a kind of common welding post-processing means, and main purpose is the welding residual stress that relaxes, subtracts
Small distortion discharges pernicious gas in weld seam, final to improve base material and joint performance.In existing correlative technology field, pass through weldering
After be heat-treated, be most common requirement to obtain the good welding structure performance of obdurability.For example, being manufactured in oil gas pipeline
In, hot-bending bends, which have to pass through high tempering (550 DEG C -650 DEG C, 1h), just can guarantee that weld seam has enough tensile strength and low
Warm toughness (most down to -40 DEG C)；Low-temperature pressure container manufacture in, welding deposited metal need through a long time heat treatment (580 DEG C,
After 4h), still has good tensile strength and low-temperature flexibility (generally -50 DEG C)；It is welded in pressurized-water reactor nuclear power plant nuclear island primary device
In connecing, intensity and low-temperature flexibility be not bright afterwards in heat treatment (620 DEG C, 10h) for the welding deposited metal of the components such as steam generator
It is aobvious to reduce, and reach technology of nuclear power design condition.
But the deposited metal of the low alloy welding wires preparation of prior art report (such as Publication No. CN103350289A,
The Chinese patent of CN102728966A, CN1433869A etc.) only can guarantee it is as-welded under the obdurability of deposited metal meet the requirements,
Deposited metal performance after not can guarantee heat treatment.Publication No. CN102019517A, CN108213770A, CN108188614A
The Chinese patent method that reports improvement or improve deposited metal tensile strength after heat treatment, but these belong to stainless steel
Or nickel-base alloy, it is not belonging to low-alloy scope.It is low that the Chinese patent of Publication No. CN106425164A discloses -50 DEG C of one kind
Warm spherical tank high strength electrode, the deposited metal of preparation after heat treatment still have excellent toughness and tenacity, but this special
Versatility is not had with deposited metal prepared by welding rod, do not can guarantee when higher temperature (such as 620 DEG C) are heat-treated or are longer
Between deposited metal performance after (such as 10h).
Summary of the invention
In view of the above-mentioned defects in the prior art, the present invention provides it is a kind of can heat resistanceheat resistant processing deposited metal, can satisfy
Different heat treatment technique (650 DEG C, 1h；580 DEG C, 4h；620 DEG C, 10h) front and back is provided with stable toughness and tenacity, reach pipe
The technical requirements in the fields such as line, low pressure vessel, nuclear power.
Technical solution of the present invention is as follows: it is a kind of can heat resistanceheat resistant processing deposited metal, including following mass percent component: C
≤ 0.05%, Si≤0.18%, Mn0.8~1.8%, S≤0.01%, P≤0.01%, Cu 0.1~0.25%, Cr 0.1~
0.25%, Ni 1.0~3.0%, Mo0.5~1.5%, Ti+RE 0.02~0.1%, 0.8≤RE/Ti≤1.2,1.5≤(Ti+
RE)/O≤2.5, remaining is Fe and inevitable impurity element.
Preferably, the mass percent that the mass percent of the Ti is 0.01~0.05%, RE is 0.01~0.05%.
Preferably, the mass percent of the O is 0.02~0.04%.
Preferably, the RE is one or more of rare earth element La and Ce, Y.
Further, the ferrite of crystallite dimension≤3 μm in the as-welded microstructure of the deposited metal accounts for percent by volume
>=81%, the ferrite of crystallite dimension≤3 μm accounts for percent by volume >=90% in the heat treatment state tissue of the deposited metal, institute
Stating heat treatment is 580~650 DEG C, 1~10h tempering.
Further, the open grain structure in the as-welded microstructure of the deposited metal is grain boundary ferrite, the crystal boundary iron element
Crystallite dimension >=10 μm of body, account for percent by volume≤1%, and the open grain structure in the heat treatment state tissue of the deposited metal is
Bainite, bainite crystallite dimension >=10 μm, account for percent by volume≤3.5%.
Further, the as-welded microstructure middle rare earth of the deposited metal be mingled with occupied area percentage be 0.04~
0.06%, the size that the rare earth oxide is mingled with is less than 1 μm.
Further, the heat treatment state tissue middle rare earth of the deposited metal is mingled with occupied area percentage and is
0.02~0.04%, the size that the rare earth oxide is mingled with is less than 1 μm.
The effect of each element is as follows in the present invention:
Ti, RE: the key element of titanium and rare earth element in the present invention.On the one hand, titanium and rare earth element are to purification deposition
The cleanliness of metal is advantageous；On the other hand, titanium and rare earth combine in deposited metal with oxygen, form the oxide folder of Dispersed precipitate
It is miscellaneous, it creates conditions for fine ferrite grain forming core in deposited metal；In addition, the oxide that titanium and rare earth are formed, which is mingled with, to be had compared with Gao Rong
Point, is influenced smaller by high-temperature heat treatment, becomes the second nucleation center of fine ferrite grain, to the deposition gold after high-temperature heat treatment
Accessory plays the role of refined crystalline strengthening and improves low-temperature flexibility.RE/Ti is controlled 0.8~1.2, forms RE-Ti-O type duplex impurity
Object ensure that inclusion size within 1 μm, avoid generation RE-O Ti-O type from easily gathering pairs of toughness and tenacity of growing up harmful
Large-sized inclusions.And preferably, the O in deposited metal is 0.02~0.04%, (RE+Ti)/O is 1.5~2.5
Within, nanoscale field trash can be made to reach sufficient density, to guarantee deposited metal in as-welded and heat treatment state toughness and tenacity.
C: appropriate carbon has invigoration effect to deposited metal, and the carbide that can form Dispersed precipitate improves the compacted of material
Denaturation energy, but excessively high carbon content will lead to excessive alloying element and be precipitated, and make deposited metal in follow-up heat treatment process
Intensity, toughness bad stability.Meanwhile higher carbon content can make weldability be deteriorated.
Si: effective deoxidant element in welding process, and also have element silicon addition in solder flux.
Mn: manganese element is good deoxidation and desulfurizing agent, can effectively reduce impurity content, while being had to deposited metal important
Invigoration effect, but manganese element content is too high can reduce the ferritic stability of high temperature.
S, P: sulphur and phosphorus are the impurity element in deposited metal, generally easily in crystal boundary segregation or form low melting point product, sternly
Ghost image rings the toughness and tenacity and heat resistanceheat resistant processing capacity of deposited metal.
Cu: for copper with the precipitation of ε-Cu particle under as-welded, Dispersed precipitate can prevent moving for sub boundary in crystal boundary and transgranular
It moves and improves creep strength.But when copper content is excessively high, ε-Cu easily aggregation roughening in heat treatment weakens strengthening effect, and
It is unfavorable to toughness.
Cr: appropriate chromium is advantageous to performance after deposited metal high-temperature heat treatment, can significantly improve creep rupture strength and
Creep strength plays solution strengthening effect in the base, but chromium is excessively high reduces welding seam toughness instead.
Ni: nickel element is the key element for improving Low Temperature Toughness of Deposited Metals, but nickel content mistake in Low Alloy Steel Welds
Ac1 point significantly reduces when high, so that deposited metal is re-formed austenite after high-temperature heat treatment, is roughened the ruler of recrystal grain
It is very little, and nickel content higher cost.
Mo: molybdenum element has in low-alloy steel improves deposited metal intensity, refines crystal grain, improves the effect of welding seam toughness
Fruit.For deposited metal after high-temperature heat treatment, molybdenum element can effectively purify crystal boundary in crystal boundary segregation, avoid the foreign atoms such as S/P
Aggregation, to improve the toughness and tenacity after deposited metal high-temperature heat treatment.
Technical solution of the present invention compared with prior art, it can be achieved that it is following the utility model has the advantages that
The as-welded heat treatment state with different process of deposited metal all has good toughness and tenacity, wherein as-welded deposited metal
Tensile strength be 650~780MPa, low-temperature impact work be Akv-40 DEG C >=132J, Akv-50 DEG C >=110 DEG C；Heat treatment state is molten
The tensile strength of metallisation be 625~755MPa, low-temperature impact work be Akv-40 DEG C >=118J, Akv-50 DEG C >=98J.
Deposited metal is after the heat treatment of different process, within the tensile strength of heat treatment state is compared to as-welded decline 15%,
Within heat treatment state low-temperature impact work is compared to as-welded decline 30%.
Detailed description of the invention
Fig. 1 is 1 deposited metal as-welded microstructure typical SEM pictures of embodiment.
Fig. 2 is 1 deposited metal heat treatment state tissue typical SEM pictures of embodiment.
Fig. 3 is 1 deposited metal inclusion distribution figure of embodiment.
Fig. 4 is 1 deposited metal field trash statistical chart of embodiment.
Specific embodiment
Below with reference to embodiment, the invention will be further described, it should be understood that these embodiments be merely to illustrate the present invention and
It is not used in and limits the scope of the invention, after the present invention has been read, those skilled in the art are to various equal similar shapes of the invention
The modification of formula is fallen in the application range as defined in the appended claims.
Embodiment 1
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.05%, Si
0.17%, Mn 1.7%, S 0.008%, P 0.006%, Cu 0.25%, Cr 0.20%, Ni 1.9%, Mo 0.8%, Ti
0.03%, RE 0.025%, remaining is Fe and inevitable impurity element.Using the K65 level steel plate in pipeline field as mother
Material opens X-type groove according to AWS standard and prepares deposited metal, in deposited metal O content be 0.03%, then to deposited metal with
650 DEG C, 1h development backfire test.Compare the tissue and performance of as-welded deposited metal and heat treatment state deposited metal: impact test
It is carried out on balance weight impact testing machine, tension test carries out on 250kN (Instron) cupping machine；Weld metal passes through
Inlay, grind, polishing and 4% nitric acid alcohol corrosion after, using metallographic microscope (ZEISS) and field emission scanning electron microscope
Structure observation is carried out, and carries out the size and content statistics of different tissues and field trash.
Embodiment 2
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.05%, Si
0.17%, Mn 0.8%, S 0.008%, P 0.006%, Cu 0.1%, Cr 0.16%, Ni 1.0%, Mo 0.5%, Ti
0.01%, RE 0.01%, remaining is Fe and inevitable impurity element.Using the K65 level steel plate in pipeline field as mother
Material opens X-type groove according to AWS standard and prepares deposited metal, in deposited metal O content be 0.008%, then to deposited metal with
650 DEG C, 1h development backfire test.Compare the tissue and performance of as-welded deposited metal and heat treatment state deposited metal: impact test
It is carried out on balance weight impact testing machine, tension test carries out on 250kN (Instron) cupping machine；Weld metal passes through
Inlay, grind, polishing and 4% nitric acid alcohol corrosion after, using metallographic microscope (ZEISS) and field emission scanning electron microscope
Structure observation is carried out, and carries out the size and content statistics of different tissues and field trash.
Embodiment 3
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.04%, Si
0.17%, Mn 1.5%, S 0.008%, P 0.005%, Cu 0.22%, Cr 0.19%, Ni 2.0%, Mo 1.0%, Ti
0.03%, RE 0.03%, remaining is Fe and inevitable impurity element.With the 07MnNiMoDR in low-temperature pressure container field
Steel plate opens X-type groove according to AWS standard and prepares deposited metal as base material, and O content is 0.03% in deposited metal, then right
Deposited metal carries out backfire test with 580 DEG C, 4h.Compare the tissue and property of as-welded deposited metal and heat treatment state deposited metal
Can: impact test carries out on balance weight impact testing machine, and tension test carries out on 250kN (Instron) cupping machine；Weldering
Seam metal is scanned after inlaying, grinding, polish and 4% nitric acid alcohol corrodes using metallographic microscope (ZEISS) and Flied emission
Electron microscope carries out structure observation, and carries out the size and content statistics of different tissues and field trash.
Embodiment 4
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.04%, Si
0.17%, Mn 1.4%, S 0.008%, P 0.005%, Cu 0.20%, Cr 0.1%, Ni 1.4%, Mo 1.1%, Ti
0.05%, RE 0.04%, remaining is Fe and inevitable impurity element.With the 07MnNiMoDR in low-temperature pressure container field
Steel plate opens X-type groove according to AWS standard and prepares deposited metal as base material, and O content is 0.06% in deposited metal, then right
Deposited metal carries out backfire test with 580 DEG C, 4h.Compare the tissue and property of as-welded deposited metal and heat treatment state deposited metal
Can: impact test carries out on balance weight impact testing machine, and tension test carries out on 250kN (Instron) cupping machine；Weldering
Seam metal is scanned after inlaying, grinding, polish and 4% nitric acid alcohol corrodes using metallographic microscope (ZEISS) and Flied emission
Electron microscope carries out structure observation, and carries out the size and content statistics of different tissues and field trash.
Embodiment 5
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.04%, Si
0.18%, Mn 1.5%, S 0.007%, P 0.008%, Cu 0.14%, Cr 0.25%, Ni 2.8%, Mo 1.45%, Ti
0.042%, RE 0.04%, remaining is Fe and inevitable impurity element.Using the 18MND5 steel plate of nuclear power field as mother
Material opens X-type groove according to AWS standard and prepares deposited metal, in deposited metal O content be 0.04%, then to deposited metal with
620 DEG C, 10h development backfire test.Compare the tissue and performance of as-welded deposited metal and heat treatment state deposited metal: impact test
It is carried out on balance weight impact testing machine, tension test carries out on 250kN (Instron) cupping machine；Weld metal passes through
Inlay, grind, polishing and 4% nitric acid alcohol corrosion after, using metallographic microscope (ZEISS) and field emission scanning electron microscope
Structure observation is carried out, and carries out the size and content statistics of different tissues and field trash.
Embodiment 6
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.04%, Si
0.18%, Mn 1.0%, S 0.007%, P 0.008%, Cu 0.16%, Cr 0.12%, Ni 2.5%, Mo 1.5%, Ti
0.02%, RE 0.024%, remaining is Fe and inevitable impurity element.Using the 18MND5 steel plate of nuclear power field as mother
Material opens X-type groove according to AWS standard and prepares deposited metal, in deposited metal O content be 0.02%, then to deposited metal with
620 DEG C, 10h development backfire test.Compare the tissue and performance of as-welded deposited metal and heat treatment state deposited metal: impact test
It is carried out on balance weight impact testing machine, tension test carries out on 250kN (Instron) cupping machine；Weld metal passes through
Inlay, grind, polishing and 4% nitric acid alcohol corrosion after, using metallographic microscope (ZEISS) and field emission scanning electron microscope
Structure observation is carried out, and carries out the size and content statistics of different tissues and field trash.
Comparative example 1
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.04%, Si
0.17%, Mn 1.6%, S 0.007%, P 0.007%, Cu 0.2%, Cr 0.21%, Ni 1.9%, Mo 0.9%, Ti
0.01%, RE 0.01%, remaining is Fe and inevitable impurity element.Using the K65 level steel plate in pipeline field as mother
Material opens X-type groove according to AWS standard and prepares deposited metal, in deposited metal O content be 0.03%, then to deposited metal with
650 DEG C, 1h development backfire test.Compare the tissue and performance of as-welded deposited metal and heat treatment state deposited metal: impact test
It is carried out on balance weight impact testing machine, tension test carries out on 250kN (Instron) cupping machine；Weld metal passes through
Inlay, grind, polishing and 4% nitric acid alcohol corrosion after, using metallographic microscope (ZEISS) and field emission scanning electron microscope
Structure observation is carried out, and carries out the size and content statistics of different tissues and field trash.
Comparative example 2
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.05%, Si
0.18%, Mn 1.6%, S 0.007%, P 0.005%, Cu 0.15%, Cr 0.22%, Ni 2.2%, Mo 1.1%, Ti
0.05%, RE 0.05%, remaining is Fe and inevitable impurity element.Using the K65 level steel plate in pipeline field as mother
Material opens X-type groove according to AWS standard and prepares deposited metal, in deposited metal O content be 0.03%, then to deposited metal with
650 DEG C, 1h development backfire test.Compare the tissue and performance of as-welded deposited metal and heat treatment state deposited metal: impact test
It is carried out on balance weight impact testing machine, tension test carries out on 250kN (Instron) cupping machine；Weld metal passes through
Inlay, grind, polishing and 4% nitric acid alcohol corrosion after, using metallographic microscope (ZEISS) and field emission scanning electron microscope
Structure observation is carried out, and carries out the size and content statistics of different tissues and field trash.
Comparative example 3
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.04%, Si
0.17%, Mn 1.7%, S 0.008%, P 0.008%, Cu 0.22%, Cr 0.24%, Ni 2.7%, Mo 1.55%, Ti
0.05%, RE 0.01%, remaining is Fe and inevitable impurity element.With the 07MnNiMoDR in low-temperature pressure container field
Steel plate opens X-type groove according to AWS standard and prepares deposited metal as base material, and O content is 0.04% in deposited metal, then right
Deposited metal carries out backfire test with 580 DEG C, 4h.Compare the tissue and property of as-welded deposited metal and heat treatment state deposited metal
Can: impact test carries out on balance weight impact testing machine, and tension test carries out on 250kN (Instron) cupping machine；Weldering
Seam metal is scanned after inlaying, grinding, polish and 4% nitric acid alcohol corrodes using metallographic microscope (ZEISS) and Flied emission
Electron microscope carries out structure observation, and carries out the size and content statistics of different tissues and field trash.
Comparative example 4
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.04%, Si
0.17%, Mn 1.5%, S 0.007%, P 0.007%, Cu 0.20%, Cr 0.23%, Ni 2.0%, Mo 1.2%, Ti
0.005%, RE 0.005%, remaining is Fe and inevitable impurity element.With low-temperature pressure container field
07MnNiMoDR steel plate opens X-type groove according to AWS standard and prepares deposited metal, O content is in deposited metal as base material
0.04%, backfire test then is carried out with 580 DEG C, 4h to deposited metal.Compare as-welded deposited metal and heat treatment state deposition gold
The tissue and performance of category: impact test carries out on balance weight impact testing machine, and tension test is stretched at 250kN (Instron) and tried
It tests on machine and carries out；Weld metal is after inlaying, grinding, polish and 4% nitric acid alcohol corrodes, using metallographic microscope
(ZEISS) and field emission scanning electron microscope carries out structure observation, and carries out the size and content of different tissues and field trash
Statistics.
Comparative example 5
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.04%, Si
0.15%, Mn 1.4%, S 0.007%, P 0.008%, Cu 0.22%, Cr 0.22%, Ni 2.5%, Mo 1.3%, Ti
0.02%, RE 0.09%, remaining is Fe and inevitable impurity element.Using the 18MND5 steel plate of nuclear power field as base material,
X-type groove is opened according to AWS standard and prepares deposited metal, and O content is 0.04% in deposited metal, then to deposited metal with 620
DEG C, 10h carry out backfire test.Compare the tissue and performance of as-welded deposited metal and heat treatment state deposited metal: impact test exists
It is carried out on balance weight impact testing machine, tension test carries out on 250kN (Instron) cupping machine；Weld metal is by edge
It is embedding, grind, polish and the corrosion of 4% nitric acid alcohol after, using metallographic microscope (ZEISS) and field emission scanning electron microscope into
Row structure observation, and carry out the size and content statistics of different tissues and field trash.
Comparative example 6
Deposited metal can heat resistanceheat resistant processing low-alloy welding wire for submerged-arc welding, including following mass percent component: C 0.05%, Si
0.2%, Mn 1.8%, S 0.007%, P 0.007%, Cu 0.15%, Cr 0.22%, Ni 2.2%, Mo 1.5%, Ti
0.02%, RE 0.03%, remaining is Fe and inevitable impurity element.Using the 18MND5 steel plate of nuclear power field as base material,
X-type groove is opened according to AWS standard and prepares deposited metal, and O content is 0.02% in deposited metal, then to deposited metal with 620
DEG C, 10h carry out backfire test.Compare the tissue and performance of as-welded deposited metal and heat treatment state deposited metal: impact test exists
It is carried out on balance weight impact testing machine, tension test carries out on 250kN (Instron) cupping machine；Weld metal is by edge
It is embedding, grind, polish and the corrosion of 4% nitric acid alcohol after, using metallographic microscope (ZEISS) and field emission scanning electron microscope into
Row structure observation, and carry out the size and content statistics of different tissues and field trash.
Tissue size, content statistics and the obdurability for the deposited metal different conditions that the various embodiments described above and comparative example obtain
It can be as shown in the table
Incorporated by reference to shown in Fig. 1 to Fig. 4, in above-mentioned each embodiment, deposited metal after as-welded deposited metal and heat treatment
In there are ferrite and two kinds of bainite to organize, while fine ferrite grain content and coarse-grain bainite content increased, but
As-welded and heat treatment state is using fine ferrite grain as major tissue types.There is the dilute of Nano grade in as-welded and heat treatment state
Native oxide is mingled with, and inclusion area percentage is declined after heat treatment.Heat treatment state deposited metal tensile strength is compared
As-welded deposited metal tensile strength fall is less than 15%, and heat treatment state deposited metal is in -40 DEG C and -50 DEG C of low-temperature impact works
30% is respectively smaller than and less than 25% compared to as-welded deposited metal fall.
In comparative example 1, although C, Si, Mn, S, P, Cu, Cr, Ni, Mo, Ti+RE, RE/Ti meet requirement of the invention,
RE+Ti/O is less so as to cause Ti-RE-O compound type inclusions content in as-welded and heat treatment state deposited metal less than 1.5, makes
Large scale tissue content is higher, and comparing as-welded and heat treatment state deposited metal intensity and low-temperature impact work can find, using this
Intensity can meet and requires within decline 15% deposited metal of ingredient preparation after heat treatment, but low-temperature flexibility fall is greater than
30%.
In comparative example 2, although C, Si, Mn, S, P, Cu, Cr, Ni, Mo, Ti+RE, RE/Ti meet requirement of the invention,
RE+Ti/O is greater than 2.5, and there is also the Ti-RE-O compound type inclusions of certain content in as-welded and heat treatment state deposited metal, but
Large scale tissue content is still higher in as-welded and heat treatment state, and compound type inclusions size is larger, and is unfavorable for Dispersed precipitate,
The nucleation mass point of fine ferrite grain in as-welded or heat treatment state deposited metal is not become, so as to cause portion of tissue roughening.It adopts
Intensity can meet and requires within decline 15% deposited metal prepared with the ingredient after heat treatment, but low-temperature flexibility fall
Greater than 30%.
In comparative example 3, although C, Si, Mn, S, P, Cu, Cr, Ni, Mo, Ti+RE, RE+Ti/O meet requirement of the invention,
But RE/Ti, less than 0.8, Ti-RE-O compound type inclusions content compares embodiment substantially in as-welded and heat treatment state deposited metal
It reduces, it is insufficient for as-welded and heat treatment state deposited metal tissue thinning effect, to make big ruler in as-welded and heat treatment state
Very little tissue content is higher.Using the ingredient preparation deposited metal after heat treatment intensity can meet decline 15% within require,
But low-temperature flexibility fall is greater than 30%.
In comparative example 4, although C, Si, Mn, S, P, Cu, Cr, Ni, Mo, RE/Ti meet requirement of the invention, RE+Ti is small
In 0.02, and RE+Ti/O, again smaller than 1.5, Ti-RE-O compound type inclusions content is compared in as-welded and heat treatment state deposited metal
Embodiment is greatly decreased, insufficient for as-welded and heat treatment state deposited metal tissue thinning effect, to make as-welded and hot place
It is higher to manage large scale tissue content in state.Intensity can meet decline 15% to the deposited metal prepared using the ingredient after heat treatment
Within require, but low-temperature flexibility fall be greater than 30%.
In comparative example 5, although C, Si, Mn, S, P, Cu, Cr, Ni, Mo meet requirement of the invention, RE+Ti is greater than 0.1,
RE/Ti is greater than 1.2, RE+Ti/O greater than 2.5, and it is multiple that there is also the Ti-RE-O of certain content in as-welded and heat treatment state deposited metal
Mould assembly field trash, but large scale tissue content is still higher in as-welded and heat treatment state, and compound type inclusions size is larger, and not
Conducive to Dispersed precipitate, do not become the nucleation mass point of fine ferrite grain in as-welded or heat treatment state deposited metal, so as to cause portion
Divide microstructure coarsening.Using the deposited metal of ingredient preparation, intensity can meet and require within decline 15% after heat treatment, but low
Warm toughness fall is greater than 30%.
In comparative example 6, although C, Si, Mn, S, P, Cu, Cr, Ni, Mo, RE+Ti meet requirement of the invention, RE/Ti is big
Ti-RE-O compound type inclusions content is greatly decreased compared to embodiment in 1.2, as-welded and heat treatment state deposited metal, for
As-welded and heat treatment state deposited metal tissue thinning effect is insufficient, to make large scale tissue content in as-welded and heat treatment state
It is higher.Using the deposited metal of ingredient preparation, intensity can meet and require within decline 15% after heat treatment, but low-temperature flexibility
Fall is greater than 30%.
Claims (8)
1. one kind can heat resistanceheat resistant processing deposited metal, including following mass percent component: C≤0.05%, Si≤0.18%,
Mn0.8~1.8%, S≤0.01%, P≤0.01%, Cu 0.1~0.25%, Cr 0.1~0.25%, Ni 1.0~3.0%,
Mo0.5~1.5%, Ti+RE 0.02~0.1%, 0.8≤RE/Ti≤1.2,1.5≤(Ti+RE)/O≤2.5, remaining for Fe and
Inevitable impurity element.
2. it is according to claim 1 can heat resistanceheat resistant processing deposited metal, which is characterized in that the mass percent of the Ti is
The mass percent of 0.01~0.05%, RE are 0.01~0.05%.
3. it is according to claim 1 can heat resistanceheat resistant processing deposited metal, which is characterized in that the mass percent of the O is
0.02~0.04%.
4. it is according to claim 1 can heat resistanceheat resistant processing deposited metal, which is characterized in that the RE be rare-earth elements La,
One or more of Ce, Y.
5. it is according to claim 1 can heat resistanceheat resistant processing deposited metal, which is characterized in that as-welded group of the deposited metal
The ferrite of crystallite dimension≤3 μm in knitting accounts for percent by volume >=81%, crystalline substance in the heat treatment state tissue of the deposited metal
The ferrite of particle size≤3 μm accounts for percent by volume >=90%, and the heat treatment is 580~650 DEG C, 1~10h tempering.
6. it is according to claim 5 can heat resistanceheat resistant processing deposited metal, which is characterized in that as-welded group of the deposited metal
Open grain structure in knitting is grain boundary ferrite, and crystallite dimension >=10 μm of the grain boundary ferrite account for percent by volume≤1%,
Open grain structure in the heat treatment state tissue of the deposited metal is bainite, bainite crystallite dimension >=10 μm, is accounted for
Percent by volume≤3.5%.
7. it is according to claim 5 can heat resistanceheat resistant processing deposited metal, which is characterized in that as-welded group of the deposited metal
Knitting middle rare earth to be mingled with occupied area percentage is 0.04~0.06%, and the size that the rare earth oxide is mingled with is less than 1 μ
m。
8. it is according to claim 5 can heat resistanceheat resistant processing deposited metal, which is characterized in that the heat treatment of the deposited metal
It is 0.02~0.04% that state tissue middle rare earth, which is mingled with occupied area percentage, and the size that the rare earth oxide is mingled with is small
In 1 μm.
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| KR101143132B1 (en) * | 2010-08-09 | 2012-05-08 | 주식회사 포스코 | Flux cored arc welded joint |
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