CN108856964A - A kind of production method preventing the irrelevant magnetic particle indications of steel-casting - Google Patents
A kind of production method preventing the irrelevant magnetic particle indications of steel-casting Download PDFInfo
- Publication number
- CN108856964A CN108856964A CN201810686968.2A CN201810686968A CN108856964A CN 108856964 A CN108856964 A CN 108856964A CN 201810686968 A CN201810686968 A CN 201810686968A CN 108856964 A CN108856964 A CN 108856964A
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- China
- Prior art keywords
- wlding
- steel
- casting
- welding
- magnetic particle
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
A kind of production method preventing the irrelevant magnetic particle indications of steel-casting, this method is wlding into wlding ingredient similar in component selections and base material composition, and Nieq/Creq >=0.42 of wlding ingredient；Preheating temperature in the range of 200 ~ 400mm of defect and its periphery is 150 ~ 200 DEG C by preheating before welding；Control Welding Process chooses welding parameter corresponding with wlding, and reaches the interlayer temperature of weld seam within the scope of 200 ~ 300 DEG C；Holding temperature >=575 DEG C of post weld heat treatment, and soaking time >=7h.Using method of the invention, the process flow of steel-casting is not increased, simple and easy, strong operability achieves significant effect in test and practical batch production.
Description
Technical field
The present invention relates to a kind of production methods for preventing the irrelevant magnetic particle indications of steel-casting, are particularly suitable for low-carbon martensite
The irrelevant magnetic particle indications of stainless steel weld joint melt run prevent, and belong to Foundry Production technical field.
Background technique
The Low Carbon Martensite Stainless Steel steel-casting that the present invention is used primarily directed to large hydropower station unit, such steel-casting
The web etc. generally combined by crown, lower ring and blade and these steel-castings.Such steel-casting product material, it is external normal
See that the trade mark is ASTM A743 Grade CA-6NM, GX4CrNi13-4, it is domestic then have ZG06Cr13Ni4Mo,
The trades mark such as ZG06Cr13Ni5Mo, ZG00Cr13Ni4Mo, ZG00Cr13Ni5Mo, ZG04Cr13Ni4Mo, ZG04Cr13Ni5Mo.
It is to avoid that cavitation corrosion and sand erosion occur in bad working environments use for Low Carbon Martensite Stainless Steel steel-casting, reduces fatigue and split
Line, increases reliability, the stability of generating efficiency, and industry standard suffers from very high want to the inside and outside quality of these steel-castings
It asks, the nondestructive inspections such as VT, MT, UT, PT even RT need to be carried out to steel-casting and detected, the steel-casting for being tested with major defect carries out
Processing is scrapped, exceeded but not serious defect needs are excavated completely, carry out soldering according to the welding procedure of standard requirements.After soldering
Post weld heat treatment stress-removal is integrally carried out to steel-casting, and hardness determination, nondestructive inspection reinspection are carried out to soldering region.In reality
In production, when carrying out MT detection to steel-casting welding position, discovery soldering position melt run part or whole melt run exists
The magnetic trace that magnetism powder accumulation is shown is similar to welding incomplete fusion defect.But it uses PT to detect again for magnetic particle indications position, does not show
Show defect.By 2 ~ 10mm of this magnetic particle indications position polishing, still visible clearly magnetic particle indications when Magnetic testing are carried out again, but right
The magnetic particle indications position uses PT to detect again, without display defect.Metallographic inspection is carried out to the position cutting sampling for there are magnetic particle indications
The presence for the defects of testing, not finding crackle, slag inclusion at melt run magnetic particle indications, therefore can be determined that this magnetic particle indications are non-
Related magnetic particle indications.
For above-mentioned irrelevant magnetic particle indications, by various detections proof welding position, that there is no is unacceptable
Defect, and not on all such material steel-castings or some steel-casting, all welding positions this phenomenon occur, but non-
Related magnetic particle indications, which have the position magnetism for illustrating to weld melt run magnetic particle indications and neighbouring base material or weldering meat, biggish difference,
I.e. organization type or form have biggish difference；Due to this species diversity, lead to irrelevant magnetic particle indications, it is therefore desirable to reduce this
Difference, advanced optimizes steel-casting quality, needs to invent a kind of method for preventing the irrelevant magnetic particle indications of weld-fusion line thus.
Summary of the invention
The present invention is directed to the irrelevant magnetic particle indications in Low Carbon Martensite Stainless Steel steel-casting soldering area, invents one kind and meets cast steel
Part actual production process, simple and easy prevention method, further increase steel-casting quality.
By that will have irrelevant magnetic particle indications region and nothing but the melt run metallographic structure of associated magnetic trace display area, hardness pair
Than discovery, there is undesirable white δ-ferritic structure to occur in irrelevant magnetic particle indications site tissue, and at melt run postwelding heat
Hardness is 300 ~ 340 HB after reason, is much higher than weld seam and base material hardness.Site tissue without irrelevant magnetic particle indications is basic
For normal martensitic structure, occur without undesirable white δ-ferritic structure, and melt run hardness≤300HB and weld seam
And base material nonhomogeneous hardness is smaller.It can determine that melt run tissue and hardness and perienchyma and nonhomogeneous hardness are aobvious by comparative analysis
It writes, magnetic conductivity is caused to have differences, regional area occur the case where magnetic trace accumulation display.It is fused around testing result from improvement
Line metallographic structure reduces melt run hardness, improves verification experimental verification, forms effective measure method.
A kind of production method preventing the irrelevant magnetic particle indications of steel-casting, includes the following steps：
Wlding is at component selections：Wlding ingredient similar in selection and base material composition, and Nieq/Creq >=0.42 of wlding ingredient.
Preheating before welding：Preheating temperature is 150 ~ 200 DEG C in the range of 200 ~ 400mm of defect and its periphery.
Control Welding Process：Welding parameter corresponding with wlding is chosen, and the interlayer temperature of weld seam is made to reach 200 ~ 300 DEG C
In range.
Post weld heat treatment：Holding temperature >=575 DEG C of post weld heat treatment, and soaking time >=7h.
In order to preferably realize the present invention, the wlding is in component selections step, the quality of the main component of the wlding
Percentage is C：0.03~0.06%,Si：0.20~0.40%,Mn：0.40~0.70%,Cr：10.5~12.5%,Mo：0.40~0.80%,
Ni：3.5~4.8%.
In order to preferably realize the present invention, in the Control Welding Process step, the welding parameter includes core diameter
For φ 4.0 ~ φ 5.0mm, welding current is 220 ~ 260A, and arc voltage is 20 ~ 24V, 5 ~ 7mm of arc length, and speed of welding is
14~23cm/min。
The present invention has following remarkable result：
It is used by a large number of experiments and scene, it is comprehensive to use production method of the invention, reduce or eliminate weld metal zone melt run
The harmful structure for locating weld metal and base metals, makes each regional organization of steel-casting tend to be close, and nonhomogeneous hardness reduces, and prevents low
The irrelevant magnetic particle indications of carbon martensitic stainless steel weld-fusion line, live practice significant effect, further improve casting
Quality.
Using method of the invention, the process flow of steel-casting is not increased, simple and easy, strong operability is being tested
And significant effect is achieved in practical batch production.
Material type and method involved by this patent also can be close and relevant material and the irrelevant magnetic in soldering area
Trace, which is shown, offers reference.
Specific embodiment
In order to illustrate more clearly of the technical solution that the present invention is implemented, technical solution of the present invention is done further below
Explanation.
A kind of production method preventing the irrelevant magnetic particle indications of steel-casting provided by the invention is suitable for low-carbon martensite not
The rust irrelevant magnetic particle indications of steel weld-fusion line prevent, and such material chemical component is mainly（Mass percent %）：C≤
0.06,Si≤0.60,Mn：0.40~1.50,P≤0.0040,S≤0.030,Cr：11.5-14.0,Mo ≤1.0,Ni：3.0-
5.5, N≤0.020；Mechanical property main indicator：Tensile strength Rm >=750 ~ 780MPa, Rp0.2 >=550 ~ 580MPa, elongation percentage
A >=18 ~ 20%, contraction percentage of area Z >=50 ~ 55%, 0 ~ 20 DEG C impact flexibility Akv >=50 ~ 100J, 220 ~ 300HB of ontology hardness.
A kind of production method preventing the irrelevant magnetic particle indications of steel-casting, mainly includes the following steps that：
Wlding is at component selections：
Low Carbon Martensite Stainless Steel cast steel part defect soldering, selection and wlding ingredient similar in base material composition, and wlding ingredient
Nieq/Creq≥0.42.Wlding main component is essentially（Mass percent, %）：C：0.03~0.06,Si：0.20~0.40,Mn：
0.40~0.70,Cr：10.5~12.5,Mo：0.40~0.80,Ni：3.5~4.8.Wherein Nieq and Creq recommend according to reference books
Formula calculate, i.e. Nieq=Ni+30*（C+N）+ 0.5Mn, Creq=Cr+Mo+1.5Si, each element is matter in formula
Measure percentage.It is can guarantee in weld structure and base material so substantially without δ-ferrite, and comprehensive performance is preferable.
The repair by welding of martensitic stain less steel casting at present can use two kinds of welding material：One is austenites
Stainless steel, another kind are martensitic stain less steels.When welding material is that austenitic stainless steel welds, welding can not be preheated, and postwelding can
With without post weld heat treatment, suitable for cannot achieve the casting of post weld heat treatment.But austenitic stainless steel welding region tissue,
Intensity, chemical property can not match with base material ASTM A743 CA6NM steel.So foundry enterprise selects the horse of same material
Family name's body stainless steel carrys out salvaging casting as welding material.Nieq/Creq >=0.42 need to be met to such material casting, just can guarantee
Substantially without δ-ferrite in weld structure and base material, and comprehensive performance is preferable.
Preheating before welding：Preheating temperature is 150 ~ 200 DEG C in the range of 200 ~ 400mm of defect and its periphery；Low-carbon geneva
Body cast stainless steel part organizes the low-carbon martensite relatively good for modeling, toughness since carbon content is low, although being high-alloy steel,
But weldability is preferable.Therefore in live actual mechanical process, by the lower of preheating temperature control, but lower preheating temperature, it can make
The melting area of welding seam cooling rate is accelerated, and is that harder tissue increases so as to cause fusion area structural transformation.According to 50 ~ 100 DEG C of preheating temperature
Degree welding, melt run hardness are difficult to drop to this hardness properly generally between 350 ~ 420HB, according to normal post weld heat treatment
Range.Preheating temperature is properly increased, then can reduce fusion area hardness, is welded according to 150 ~ 200 DEG C of preheating temperatures, after welding
Weld metal hardness can control in≤340 HB, can be reduced to melt run hardness suitably by normal post weld heat treatment
Range.
Control Welding Process：Welding parameter corresponding with wlding is chosen, and the interlayer temperature of weld seam is made to reach 200 ~ 300 DEG C
In range；Welding parameter includes：Core diameter be 4.0 ~ φ of φ 5.0mm, welding current be 220 ~ 260A, arc voltage be 20 ~
24V, 5 ~ 7mm of arc length, speed of welding are 14 ~ 23cm/min.
Post weld heat treatment：Holding temperature >=575 DEG C of post weld heat treatment, and soaking time >=7h.Higher postwelding temperature
With sufficient soaking time, the martensite in weld metal and the tissue of heat affected area melt run can be made adequately to be decomposed
Melt run hardness can be reduced to≤300HB by softening, post weld heat treatment in this way.Seam organization gradually tends to and base material
Tissue it is close, reduce the nonhomogeneous hardness of heat affected area melt run hardness and base material and weld metal, magnetic conductivity tends to be close,
Eliminate the irrelevant magnetic particle indications of melt run.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and wants according to right of the present invention
Made equivalent variations is sought, is still belonged to the scope covered by the invention.
Claims (3)
1. a kind of production method for preventing the irrelevant magnetic particle indications of steel-casting, which is characterized in that include the following steps：
Wlding is at component selections：Wlding ingredient similar in selection and base material composition, and Nieq/Creq >=0.42 of wlding ingredient；
Preheating before welding：Preheating temperature is 150 ~ 200 DEG C in the range of 200 ~ 400mm of defect and its periphery；
Control Welding Process：Welding parameter corresponding with wlding is chosen, and the interlayer temperature of weld seam is made to reach 200 ~ 300 DEG C of ranges
It is interior；
Post weld heat treatment：Holding temperature >=575 DEG C of post weld heat treatment, and soaking time >=7h.
2. a kind of production method for preventing the irrelevant magnetic particle indications of steel-casting according to claim 1, which is characterized in that institute
Wlding is stated in component selections step, the mass percent of the main component of the wlding is C：0.03~0.06%,Si：0.20~
0.40%,Mn：0.40~0.70%,Cr：10.5~12.5%,Mo：0.40~0.80%,Ni：3.5~4.8%.
3. a kind of production method for preventing the irrelevant magnetic particle indications of steel-casting according to claim 1, which is characterized in that institute
It states in Control Welding Process step, the welding parameter includes, and core diameter is 4.0 ~ φ of φ 5.0mm, and welding current is 220 ~
260A, arc voltage are 20 ~ 24V, and 5 ~ 7mm of arc length, speed of welding is 14 ~ 23cm/min.
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| CN201810686968.2A CN108856964A (en) | 2018-06-29 | 2018-06-29 | A kind of production method preventing the irrelevant magnetic particle indications of steel-casting |
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Cited By (1)
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| CN110434503A (en) * | 2019-07-29 | 2019-11-12 | 沈阳露天采矿设备制造有限公司 | A kind of welding procedure of A743-CA6NM material |
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Application publication date: 20181123 |