CN105463171B - A kind of preparation method of nuclear-power reactor austenitic stainless steel bar material - Google Patents
A kind of preparation method of nuclear-power reactor austenitic stainless steel bar material Download PDFInfo
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- CN105463171B CN105463171B CN201510822585.XA CN201510822585A CN105463171B CN 105463171 B CN105463171 B CN 105463171B CN 201510822585 A CN201510822585 A CN 201510822585A CN 105463171 B CN105463171 B CN 105463171B
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- stainless steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
Abstract
A kind of preparation method the invention provides nuclear-power reactor with austenitic stainless steel bar material, comprises the following steps：First, the first roller die drawing is carried out to austenitic stainless steel bar base, obtains the first drawing bar stock；2nd, the first solution treatment is carried out to the first drawing bar stock；3rd, the second roller die drawing is carried out, obtains the second drawing bar stock；4th, die drawing is fixed to the second drawing bar stock to pull out；5th, the second solution treatment is carried out；6th, stretcher leveling and roll straightening are electrically heated, obtains nuclear-power reactor austenitic stainless steel bar material.Nuclear-power reactor prepared by the present invention is not more than 0.02mm with the dimensional tolerance of austenitic stainless steel bar material, linearity is not more than 0.2mm/m, mechanical property fully meets the requirement of ASTM A276 technical conditions, and microscopic structure is uniformly tiny, and crystal boundary clearly has no obvious Carbide Precipitation.
Description
Technical field
The invention belongs to stainless steel material processing technique field, and in particular to a kind of nuclear-power reactor austenitic stainless steel
The preparation method of bar.
Background technology
Key function, structural material of the nuclear-power reactor by the use of austenitic stainless steel bar material as nuclear reactor, extensively should
For control assembly and fuel assembly.Specific application environment determines the processing side to " core level " austenitic stainless steel bar material
Formula, material property, dimensional accuracy and Non-Destructive Testing have very harsh requirement.
Nuclear-power reactor is typically combined with austenitic stainless steel bar material using hot-working with stent cold drawing at present
Preparation technology；Aligned during finishing using roll leveller, be then ground, polished；But existing processing technology is present
Following technical deficiency：
First, heat processing technique can cause stainless steel bars process after tissue it is thick, cooldown rate is not in cooling procedure
It stainless steel bars is separated out substantial amounts of carbide, influence its corrosive nature.
Secondly, requirement during stent drawing process cold worked stainless steel bar to lubricating condition is very high, easily and mould
Sticking together influences production efficiency；The mode of texturing of metal is surface metal stream when stainless steel bars uses stent drawing simultaneously
Flowing mode, bar deformation is uneven, influences its mechanical property.
Again, because the intensity of " core level " austenitic stainless steel is larger, the requirement to dimensional accuracy is very harsh, therefore tradition
Roll leveller aligning after bar linearity be difficult to reach requirement, and need repeatedly to be aligned, production efficiency is relatively low.
Therefore, a kind of good quality of product, production efficiency height, the nuclear-power reactor suitable for large-scale industrial production are needed badly
With the preparation method of austenitic stainless steel bar material.
The content of the invention
The technical problems to be solved by the invention are to be directed to above-mentioned the deficiencies in the prior art, there is provided a kind of nuclear-power reactor
With the preparation method of austenitic stainless steel bar material.The chi of the nuclear-power reactor austenitic stainless steel bar material prepared using this method
Very little tolerance is not more than 0.02mm, and linearity is not more than 0.2mm/m, and mechanical property fully meets wanting for ASTM A276 technical conditions
Ask, microscopic structure is uniformly tiny, and crystal boundary clearly has no Carbide Precipitation, and grain size is finally rated 8.5~9 grades.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of nuclear-power reactor austenite stainless
The preparation method of Steel Bar, it is characterised in that this method comprises the following steps：
Step 1: carrying out the first roller die drawing to austenitic stainless steel bar base, the first drawing bar stock is obtained；First roller
Die drawing is pulled out as cold drawing, and the working modulus of first roller die drawing is 60%~85%；
Step 2: heated to the first drawing bar stock described in step 1, make the first drawing bar stock with 300 DEG C/min~
400 DEG C/min heating rate is warming up to 1050 DEG C~1150 DEG C the first solution treatment of progress, then water cooling to 25 DEG C of room temperatures；
Step 3: carrying out the second roller die drawing to the first drawing bar stock after water cooling in step 2, the second drawing rod is obtained
Base；Second roller die drawing is cold drawing, and the working modulus of second roller die drawing is 40%~90%；
Pulled out Step 4: die drawing is fixed to the second drawing bar stock described in step 3, the second drawing bar stock is returned circle；Institute
It is cold drawing to state stent drawing, and the working modulus of the stent drawing is 3%~10%；
Step 5: to return in step 4 circle after the second drawing bar stock heat, make the second drawing bar stock with 300 DEG C/
Min~400 DEG C/min heating rate is warming up to 950 DEG C~1150 DEG C the second solution treatment of progress, then water cooling to 25 DEG C of rooms
Temperature；
Step 6: stretcher leveling is electrically heated to the second drawing bar stock after the second solution treatment in step 5, then
Roll straightening is carried out to the second drawing bar stock after electrical heating stretcher leveling, is ground and polishing, finally given afterwards
It is shaped as the nuclear-power reactor austenitic stainless steel bar material of cylinder, nuclear-power reactor austenitic stainless steel bar material
Diameter of section is 5.5mm~12.5mm, and dimensional tolerance is not more than 0.02mm, and linearity is not more than 0.2mm/m.
The preparation method of above-mentioned a kind of nuclear-power reactor austenitic stainless steel bar material, it is characterised in that in step 1
The austenitic stainless steel bar base is cylindrical bar stock, and the diameter of section of the austenitic stainless steel bar base is 30mm~45mm.
The preparation method of above-mentioned a kind of nuclear-power reactor austenitic stainless steel bar material, it is characterised in that in step 1
The working modulus of first roller die drawing is 75%~80%.
The preparation method of above-mentioned a kind of nuclear-power reactor austenitic stainless steel bar material, it is characterised in that in step 3
The working modulus of second roller die drawing is 55%~65%.
The preparation method of above-mentioned a kind of nuclear-power reactor austenitic stainless steel bar material, it is characterised in that in step 4
The working modulus of the stent drawing is 3%~5%.
The preparation method of above-mentioned a kind of nuclear-power reactor austenitic stainless steel bar material, it is characterised in that in step 6
The temperature of the electrical heating stretcher leveling is 700 DEG C~800 DEG C.
The preparation method of above-mentioned a kind of nuclear-power reactor austenitic stainless steel bar material, it is characterised in that in step 6
The nuclear-power reactor is 8.5mm~11.5mm with the diameter of section of austenitic stainless steel bar material.
The present invention has advantages below compared with prior art：
1st, the processing mode that the present invention is combined using roller die drawing with stent drawing, wherein roller die drawing technique are processed
Be rolling friction during stainless steel bars, it is not necessary to lubricant and machining deformation amount is larger, deformation is uniform, but due to roller die drawing after
Bar stock ovality and dimensional tolerance it is larger, therefore it is final carry out returning circle using the stent drawing of small deformation amount, so as to protect
Demonstrate,prove product specification.
2nd, current roller die drawing equipment is used for silk material processing, is generally used in conjunction with curled hair roller, after bar can be caused to process
Larger radian is produced, is unfavorable for aligning.Roller die drawing is used for bar field by the present invention, makes full use of the processing of roller die drawing special
Property, beneficial to the stainless steel bars for preparing higher quality.
3rd, because requirement of the nuclear-power reactor austenitic stainless steel for intensity is higher, and to finished product bar size precision
Requirement it is very harsh, the present invention is carried out using the straightening process that electrical heating stretcher leveling and roll straightening are combined to bar
Aligning.The selection of straightening temperature is particularly important during heating-straightening, and temperature is too high to cause rod mechanical performance to decline, and temperature is too low
Leveling effect is not had then, while possible carbide precipitate influences its corrosive nature, therefore the present invention is by paying a large amount of creation
Property engineer testing determine heating-straightening temperature, final optimization pass goes out heating-straightening temperature for 700 DEG C~800 DEG C.
4th, the nuclear-power reactor prepared using the present invention is not more than 0.02mm with the dimensional tolerance of austenitic stainless steel bar material,
Linearity is not more than 0.2mm/m, and mechanical property fully meets the requirement of ASTM A276 technical conditions, and microscopic structure is uniformly tiny,
Crystal boundary clearly has no Carbide Precipitation, and grain size is finally rated 8.5~9 grades.
The present invention is described in further detail with reference to the accompanying drawings and examples.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of nuclear-power reactor austenitic stainless steel bar material prepared by the embodiment of the present invention 1.
Embodiment
Embodiment 1
The preparation method of the present embodiment nuclear-power reactor austenitic stainless steel bar material comprises the following steps：
Step 1: selected shape is cylinder, diameter of section is 30mm austenitic stainless steel bar base, then using roller die
Drawbench carries out the first roller die drawing to austenitic stainless steel bar base, obtains the first drawing bar stock；First roller die drawing is
Cold drawing, the working modulus of first roller die drawing is 75%；The cross sectional shape of the first drawing bar stock is subcircular, section
The average-size of diameter is 15mm；
Step 2: the first drawing bar stock described in step 1 is heated using the method being powered, while using infrared
Temperature measurer is monitored in real time to the temperature of the first drawing bar stock, and electrical current is adjusted according to measured temperature, makes
One drawing bar stock is warming up to 1150 DEG C of first solution treatment of progress with 350 DEG C/min heating rate, then water cooling to 25 DEG C of rooms
Temperature；
Step 3: the first drawing bar stock in step 2 after the first solution treatment and water cooling is entered using roller die drawing machine
The roller die drawing of row second, obtain the second drawing bar stock；Second roller die drawing is cold drawing, and second roller die drawing adds
Work rate is 55%；The cross sectional shape of the second drawing bar stock is subcircular, and the average-size of diameter of section is 10mm；
Pulled out Step 4: die drawing is fixed to the second drawing bar stock described in step 3 using drawbench, make the second drawing
Bar stock returns circle；The stent drawing is cold drawing, and the working modulus of the stent drawing is 3%；After the stent drawing
The cross sectional shape of second drawing bar stock is circle, and the average-size of diameter of section is 9.9mm；
Step 5: the second drawing bar stock after stent drawing in step 4 is heated using the method being powered, together
Shi Caiyong infrared radiation thermometers are monitored in real time to the temperature of stent drawing bar stock, and electrical current is entered according to measured temperature
Row regulation, the second drawing bar stock is set to be warming up to 1100 DEG C of second solution treatment of progress, Ran Houshui with 350 DEG C/min heating rate
It is cooled to 25 DEG C of room temperatures；
Step 6: using electrical heating tension flattening machine to the second drawing bar stock after the second solution treatment in step 5 in temperature
Spend to be electrically heated stretcher leveling under conditions of 750 DEG C, then using roll leveller to after electrical heating stretcher leveling
Two drawing bar stocks carry out roll straightening, and the diameter of section of the second drawing bar stock after aligning is 9.9mm, and ovality is not more than
0.01mm, the bar after aligning is processed with polishing the finishing process being combined using grinding afterwards, finally gives nuclear power
Reactor austenitic stainless steel bar material.
Nuclear-power reactor austenitic stainless steel bar material manufactured in the present embodiment is shaped as cylinder, and diameter of section is
9.7mm, length 4000mm, the dimensional tolerance of bar are not more than 0.02mm, and linearity is not more than 0.2mm/m.It is prepared by the present embodiment
Nuclear-power reactor with the metallographic structure of austenitic stainless steel bar material as shown in figure 1, the fine microstructures of the bar are equal as can be seen from Figure 1
Even, crystal boundary is clear and carbides-free separates out, and final grain size is rated 8.5~9 grades.Nuclear-power reactor manufactured in the present embodiment is used
Austenitic stainless steel bar material mechanical performance data is shown in Table 1.
The mechanical performance data of 1 embodiment of table, 1 made bar
As shown in Table 1, nuclear-power reactor manufactured in the present embodiment austenitic stainless steel bar material excellent in mechanical performance, completely
Meet the requirement of ASTM A276 technical conditions.
Embodiment 2
The preparation method of the present embodiment nuclear-power reactor austenitic stainless steel bar material comprises the following steps：
Step 1: selected shape is cylinder, diameter of section is 35mm austenitic stainless steel bar base, then using roller die
Drawbench carries out the first roller die drawing to austenitic stainless steel bar base, obtains the first drawing bar stock；First roller die drawing is
Cold drawing, the working modulus of first roller die drawing is 80%；The cross sectional shape of the first drawing bar stock is subcircular, section
The average-size of diameter is 15.65mm；
Step 2: the first drawing bar stock described in step 1 is heated using the method being powered, while using infrared
Temperature measurer is monitored in real time to the temperature of the first drawing bar stock, and electrical current is adjusted according to measured temperature, makes
One drawing bar stock is warming up to 1100 DEG C of first solution treatment of progress with 350 DEG C/min heating rate, then water cooling to 25 DEG C of rooms
Temperature；
Step 3: the first drawing bar stock in step 2 after the first solution treatment and water cooling is entered using roller die drawing machine
The roller die drawing of row second, obtain the second drawing bar stock；Second roller die drawing is cold drawing, and second roller die drawing adds
Work rate is 60%；The cross sectional shape of the second drawing bar stock is subcircular, and the average-size of diameter of section is 9.9mm；
Pulled out Step 4: die drawing is fixed to the second drawing bar stock described in step 3 using drawbench, make the second drawing
Bar stock returns circle；The stent drawing is cold drawing, and the working modulus of the stent drawing is 4%；After the stent drawing
The cross sectional shape of second drawing bar stock is circle, and the average-size of diameter of section is 9.7mm；
Step 5: the second drawing bar stock after stent drawing in step 4 is heated using the method being powered, together
Shi Caiyong infrared radiation thermometers are monitored in real time to the temperature of stent drawing bar stock, and electrical current is entered according to measured temperature
Row regulation, the second drawing bar stock is set to be warming up to 1100 DEG C of first solution treatment of progress, Ran Houshui with 350 DEG C/min heating rate
It is cooled to 25 DEG C of room temperatures；
Step 6: using electrical heating tension flattening machine to the second drawing bar stock after the second solution treatment in step 5 in temperature
Spend to be electrically heated stretcher leveling under conditions of 750 DEG C, then using roll leveller to consolidating after electrical heating stretcher leveling
Cover half drawing bar stock carries out roll straightening, and the diameter of section of the second drawing bar stock after aligning is 9.7mm, and ovality is not more than
0.01mm, the bar after aligning is processed with polishing the finishing process being combined using grinding afterwards, finally gives nuclear power
Reactor austenitic stainless steel bar material.
Nuclear-power reactor austenitic stainless steel bar material manufactured in the present embodiment is shaped as cylinder, and diameter of section is
9.5mm, length 4000mm, the dimensional tolerance of bar are not more than 0.02mm, and linearity is not more than 0.2mm/m.It is prepared by the present embodiment
Nuclear-power reactor it is uniform with the fine microstructures of austenitic stainless steel bar material, crystal boundary is clear and carbides-free separates out, final crystal grain
Degree is rated 8.5~9 grades.Nuclear-power reactor manufactured in the present embodiment is shown in Table 2 with austenitic stainless steel bar material mechanical performance data.
The mechanical performance data of 2 embodiment of table, 2 made bar
As shown in Table 2, nuclear-power reactor manufactured in the present embodiment austenitic stainless steel bar material excellent in mechanical performance, completely
Meet the requirement of ASTM A276 technical conditions.
Embodiment 3
The preparation method of the present embodiment nuclear-power reactor austenitic stainless steel bar material comprises the following steps：
Step 1: selected shape is cylinder, diameter of section is 30mm austenitic stainless steel bar base, then using roller die
Drawbench carries out the first roller die drawing to austenitic stainless steel bar base, obtains the first drawing bar stock；First roller die drawing is
Cold drawing, the working modulus of first roller die drawing is 75%；The cross sectional shape of the first drawing bar stock is subcircular, section
The average-size of diameter is 15mm；
Step 2: the first drawing bar stock described in step 1 is heated using the method being powered, while using infrared
Temperature measurer is monitored in real time to the temperature of the first drawing bar stock, and electrical current is adjusted according to measured temperature, makes
One drawing bar stock is warming up to 1050 DEG C of first solution treatment of progress with 300 DEG C/min heating rate, then water cooling to 25 DEG C of rooms
Temperature；
Step 3: the first drawing bar stock in step 2 after the first solution treatment and water cooling is entered using roller die drawing machine
The roller die drawing of row second, obtain the second drawing bar stock；Second roller die drawing is cold drawing, and second roller die drawing adds
Work rate is 65%；The cross sectional shape of the second drawing bar stock is subcircular, and the average-size of diameter of section is 8.9mm；
Pulled out Step 4: die drawing is fixed to the second drawing bar stock described in step 3 using drawbench, make the second drawing
Bar stock returns circle；The stent drawing is cold drawing, and the working modulus of the stent drawing is 5%；After the stent drawing
The cross sectional shape of second drawing bar stock is circle, and the average-size of diameter of section is 8.6mm；
Step 5: the second drawing bar stock after stent drawing in step 4 is heated using the method being powered, together
Shi Caiyong infrared radiation thermometers are monitored in real time to the temperature of stent drawing bar stock, and electrical current is entered according to measured temperature
Row regulation, the second drawing bar stock is set to be warming up to 950 DEG C of second solution treatment of progress, Ran Houshui with 300 DEG C/min heating rate
It is cooled to 25 DEG C of room temperatures；
Step 6: use electrical heating tension flattening machine to the drawing bar stock after the second solution treatment in step 5 temperature for
Stretcher leveling is electrically heated under conditions of 800 DEG C, then second after electrical heating stretcher leveling is drawn using roll leveller
Spike pulling base carries out roll straightening, and the diameter of section of the second drawing bar stock after aligning is 8.6mm, and ovality is not more than 0.01mm,
The bar after aligning is processed with polishing the finishing process being combined using grinding afterwards, finally gives nuclear-power reactor use
Austenitic stainless steel bar material.
Nuclear-power reactor austenitic stainless steel bar material manufactured in the present embodiment is shaped as cylinder, and diameter of section is
8.5mm, length 4000mm, the dimensional tolerance of bar are not more than 0.02mm, and linearity is not more than 0.2mm/m.It is prepared by the present embodiment
Nuclear-power reactor it is uniform with the fine microstructures of austenitic stainless steel bar material, crystal boundary is clear and carbides-free separates out, final crystal grain
Degree is rated 8.5~9 grades.Nuclear-power reactor manufactured in the present embodiment is shown in Table 3 with austenitic stainless steel bar material mechanical performance data.
The mechanical performance data of 3 embodiment of table, 3 made bar
As shown in Table 3, nuclear-power reactor manufactured in the present embodiment austenitic stainless steel bar material excellent in mechanical performance, completely
Meet the requirement of ASTM A276 technical conditions.
Embodiment 4
The preparation method of the present embodiment nuclear-power reactor austenitic stainless steel bar material comprises the following steps：
Step 1: selected shape is cylinder, diameter of section is 40mm austenitic stainless steel bar base, then using roller die
Drawbench carries out the first roller die drawing to austenitic stainless steel bar base, obtains the first drawing bar stock；First roller die drawing is
Cold drawing, the working modulus of first roller die drawing is 85%；The cross sectional shape of the first drawing bar stock is subcircular, section
The average-size of diameter is 15.5mm；
Step 2: the first drawing bar stock described in step 1 is heated using the method being powered, while using infrared
Temperature measurer is monitored in real time to the temperature of the first drawing bar stock, and electrical current is adjusted according to measured temperature, makes
One drawing bar stock is warming up to 1150 DEG C of first solution treatment of progress with 400 DEG C/min heating rate, then water cooling to 25 DEG C of rooms
Temperature；
Step 3: the first drawing bar stock in step 2 after the first solution treatment and water cooling is entered using roller die drawing machine
The roller die drawing of row second, obtain the second drawing bar stock；Second roller die drawing is cold drawing, and second roller die drawing adds
Work rate is 40%；The cross sectional shape of the second drawing bar stock is subcircular, and the average-size of diameter of section is 12.0mm；
Pulled out Step 4: die drawing is fixed to the second drawing bar stock described in step 3 using drawbench, make the second drawing
Bar stock returns circle；The stent drawing is cold drawing, and the working modulus of the stent drawing is 5%；After the stent drawing
The cross sectional shape of second drawing bar stock is circle, and the average-size of diameter of section is 11.7mm；
Step 5: the second drawing bar stock after stent drawing in step 4 is heated using the method being powered, together
Shi Caiyong infrared radiation thermometers are monitored in real time to the temperature of stent drawing bar stock, and electrical current is entered according to measured temperature
Row regulation, the second drawing bar stock is set to be warming up to 1050 DEG C of second solution treatment of progress, Ran Houshui with 400 DEG C/min heating rate
It is cooled to 25 DEG C of room temperatures；
Step 6: using electrical heating tension flattening machine to the second drawing bar stock after the second solution treatment in step 5 in temperature
Spend to be electrically heated stretcher leveling under conditions of 700 DEG C, then using roll leveller to after electrical heating stretcher leveling
Two drawing bar stocks carry out roll straightening, and the diameter of section of the second drawing bar stock after aligning is 11.7mm, and ovality is not more than
0.01mm, the bar after aligning is processed with polishing the finishing process being combined using grinding afterwards, finally gives nuclear power
Reactor austenitic stainless steel bar material.
Nuclear-power reactor austenitic stainless steel bar material manufactured in the present embodiment is shaped as cylinder, and diameter of section is
11.5mm, length 4000mm, the dimensional tolerance of bar are not more than 0.02mm, and linearity is not more than 0.2mm/m.It is prepared by the present embodiment
Nuclear-power reactor it is uniform with the fine microstructures of austenitic stainless steel bar material, crystal boundary is clear and carbides-free separates out, final crystal grain
Degree is rated 8.5~9 grades.Nuclear-power reactor manufactured in the present embodiment is shown in Table 4 with austenitic stainless steel bar material mechanical performance data.
The mechanical performance data of 4 embodiment of table, 4 made bar
As shown in Table 4, nuclear-power reactor manufactured in the present embodiment austenitic stainless steel bar material excellent in mechanical performance, completely
Meet the requirement of ASTM A276 technical conditions.
Embodiment 5
The preparation method of the present embodiment nuclear-power reactor austenitic stainless steel bar material comprises the following steps：
Step 1: selected shape is cylinder, diameter of section is 45mm austenitic stainless steel bar base, then using roller die
Drawbench carries out the first roller die drawing to austenitic stainless steel bar base, obtains the first drawing bar stock；First roller die drawing is
Cold drawing, the working modulus of first roller die drawing is 80%；The cross sectional shape of the first drawing bar stock is subcircular, section
The average-size of diameter is 20mm；
Step 2: the first drawing bar stock described in step 1 is heated using the method being powered, while using infrared
Temperature measurer is monitored in real time to the temperature of the first drawing bar stock, and electrical current is adjusted according to measured temperature, makes
One drawing bar stock is warming up to 1150 DEG C of first solution treatment of progress with 400 DEG C/min heating rate, then water cooling to 25 DEG C of rooms
Temperature；
Step 3: the first drawing bar stock in step 2 after the first solution treatment and water cooling is entered using roller die drawing machine
The roller die drawing of row second, obtain the second drawing bar stock；Second roller die drawing is cold drawing, and second roller die drawing adds
Work rate is 55%；The cross sectional shape of the second drawing bar stock is subcircular, and the average-size of diameter of section is 13.5mm；
Pulled out Step 4: die drawing is fixed to the second drawing bar stock described in step 3 using drawbench, make the second drawing
Bar stock returns circle；The stent drawing is cold drawing, and the working modulus of the stent drawing is 10%；After the stent drawing
The cross sectional shape of second drawing bar stock is circle, and the average-size of diameter of section is 12.8mm；
Step 5: the second drawing bar stock after stent drawing in step 4 is heated using the method being powered, together
Shi Caiyong infrared radiation thermometers are monitored in real time to the temperature of stent drawing bar stock, and electrical current is entered according to measured temperature
Row regulation, the second drawing bar stock is set to be warming up to 1150 DEG C of second solution treatment of progress, Ran Houshui with 400 DEG C/min heating rate
It is cooled to 25 DEG C of room temperatures；
Step 6: using electrical heating tension flattening machine to the second drawing bar stock after the second solution treatment in step 5 in temperature
Spend to be electrically heated stretcher leveling under conditions of 700 DEG C, then using roll leveller to after electrical heating stretcher leveling
Two drawing bar stocks carry out roll straightening, and the diameter of section of the second drawing bar stock after aligning is 12.8mm, and ovality is not more than
0.01mm, the bar after aligning is processed with polishing the finishing process being combined using grinding afterwards, finally gives nuclear power
Reactor austenitic stainless steel bar material.
Nuclear-power reactor austenitic stainless steel bar material manufactured in the present embodiment is shaped as cylinder, and diameter of section is
12.5mm, length 4000mm, the dimensional tolerance of bar are not more than 0.02mm, and linearity is not more than 0.2mm/m.
Nuclear-power reactor manufactured in the present embodiment is uniform with the fine microstructures of austenitic stainless steel bar material, and crystal boundary is clear and nothing
Carbide Precipitation, final grain size are rated 8.5~9 grades.Nuclear-power reactor austenitic stainless steel bar manufactured in the present embodiment
Material mechanical performance data is shown in Table 5.
The mechanical performance data of 5 embodiment of table, 5 made bar
As shown in Table 5, nuclear-power reactor manufactured in the present embodiment austenitic stainless steel bar material excellent in mechanical performance, completely
Meet the requirement of ASTM A276 technical conditions.
Embodiment 6
The preparation method of the present embodiment nuclear-power reactor austenitic stainless steel bar material comprises the following steps：
Step 1: selected shape is cylinder, diameter of section is 30mm austenitic stainless steel bar base, then using roller die
Drawbench carries out the first roller die drawing to austenitic stainless steel bar base, obtains the first drawing bar stock；First roller die drawing is
Cold drawing, the working modulus of first roller die drawing is 60%；The cross sectional shape of the first drawing bar stock is subcircular, section
The average-size of diameter is 19mm；
Step 2: the first drawing bar stock described in step 1 is heated using the method being powered, while using infrared
Temperature measurer is monitored in real time to the temperature of the first drawing bar stock, and electrical current is adjusted according to measured temperature, makes
One drawing bar stock is warming up to 1100 DEG C of first solution treatment of progress with 350 DEG C/min heating rate, then water cooling to 25 DEG C of rooms
Temperature；
Step 3: the first drawing bar stock in step 2 after the first solution treatment and water cooling is entered using roller die drawing machine
The roller die drawing of row second, obtain the second drawing bar stock；Second roller die drawing is cold drawing, and second roller die drawing adds
Work rate is 90%；The cross sectional shape of the second drawing bar stock is subcircular, and the average-size of diameter of section is 6mm；
Pulled out Step 4: die drawing is fixed to the second drawing bar stock in step 3 using drawbench, to the second drawing rod
Base carries out returning circle；The stent drawing is cold drawing, and the working modulus of the stent drawing is 8%；The stent drawing
The cross sectional shape of the second drawing bar stock is circle afterwards, and the average-size of diameter of section is 5.8mm；
Step 5: the bar stock of stent drawing described in step 4 is heated using the method being powered, while using red
Outer temperature measurer is monitored in real time to the temperature of the second drawing bar stock, and electrical current is adjusted according to measured temperature, is made
Second drawing bar stock is warming up to 1100 DEG C of second solution treatment of progress with 350 DEG C/min heating rate, and then water cooling is to 25 DEG C
Room temperature；
Step 6: use electrical heating tension flattening machine to stent drawing bar stock in step 5 in temperature for 750 DEG C of bar
Stretcher leveling is electrically heated under part, then the second drawing bar stock after electrical heating stretcher leveling is carried out using roll leveller
Roll straightening, the diameter of section of the second drawing bar stock after aligning is 5.8mm, and ovality is not more than 0.01mm, afterwards using mill
Cut and the bar after aligning is processed with polishing the finishing process being combined, finally give nuclear-power reactor austenite stainless
Steel Bar.
Nuclear-power reactor austenitic stainless steel bar material manufactured in the present embodiment is shaped as cylinder, and diameter of section is
5.5mm length 4000mm, the dimensional tolerance of bar is not more than 0.02mm, and linearity is not more than 0.2mm/m.It is prepared by the present embodiment
Nuclear-power reactor it is uniform with the fine microstructures of austenitic stainless steel bar material, crystal boundary is clear and carbides-free separates out, final crystal grain
Degree is rated 8.5~9 grades.Nuclear-power reactor manufactured in the present embodiment is shown in Table 6 with austenitic stainless steel bar material mechanical performance data.
The mechanical performance data of 6 embodiment of table, 6 made bar
As shown in Table 6, nuclear-power reactor manufactured in the present embodiment austenitic stainless steel bar material excellent in mechanical performance, completely
Meet the requirement of ASTM A276 technical conditions.
It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions.It is every according to invention skill
Any simple modification, change and equivalence change that art is substantially made to above example, still fall within technical solution of the present invention
Protection domain in.
Claims (7)
1. a kind of nuclear-power reactor preparation method of austenitic stainless steel bar material, it is characterised in that this method includes following step
Suddenly：
Step 1: carrying out the first roller die drawing to austenitic stainless steel bar base, the first drawing bar stock is obtained；First roller die is drawn
Pull out as cold drawing, the working modulus of first roller die drawing is 60%~85%；
Step 2: being heated to the first drawing bar stock described in step 1, make the first drawing bar stock with 300 DEG C/min~400
DEG C/min heating rate is warming up to 1050 DEG C~1150 DEG C the first solution treatment of progress, then water cooling to 25 DEG C of room temperatures；
Step 3: carrying out the second roller die drawing to the first drawing bar stock after water cooling in step 2, the second drawing bar stock is obtained；Institute
It is cold drawing to state the second roller die drawing, and the working modulus of second roller die drawing is 40%~90%；
Pulled out Step 4: die drawing is fixed to the second drawing bar stock described in step 3, the second drawing bar stock is returned circle；It is described solid
Cover half drawing is cold drawing, and the working modulus of the stent drawing is 3%~10%；
Step 5: to return in step 4 circle after the second drawing bar stock heat, make the second drawing bar stock with 300 DEG C/min~
400 DEG C/min heating rate is warming up to 950 DEG C~1150 DEG C the second solution treatment of progress, then water cooling to 25 DEG C of room temperatures；
Step 6: stretcher leveling is electrically heated to the second drawing bar stock after the second solution treatment in step 5, then to electricity
Heat the second drawing bar stock after stretcher leveling and carry out roll straightening, be ground afterwards and polishing, finally give shape
For the nuclear-power reactor austenitic stainless steel bar material of cylinder, the section of nuclear-power reactor austenitic stainless steel bar material
A diameter of 5.5mm~12.5mm, dimensional tolerance are not more than 0.02mm, and linearity is not more than 0.2mm/m.
2. a kind of preparation method of nuclear-power reactor austenitic stainless steel bar material according to claim 1, its feature exist
In austenitic stainless steel bar base described in step 1 is cylindrical bar stock, and the diameter of section of the austenitic stainless steel bar base is
30mm~45mm.
3. a kind of preparation method of nuclear-power reactor austenitic stainless steel bar material according to claim 1, its feature exist
In the working modulus of the first roller die drawing described in step 1 is 75%~80%.
4. a kind of preparation method of nuclear-power reactor austenitic stainless steel bar material according to claim 1, its feature exist
In the working modulus of the second roller die drawing described in step 3 is 55%~65%.
5. a kind of preparation method of nuclear-power reactor austenitic stainless steel bar material according to claim 1, its feature exist
In the working modulus of stent drawing described in step 4 is 3%~5%.
6. a kind of preparation method of nuclear-power reactor austenitic stainless steel bar material according to claim 1, its feature exist
In the temperature of electrical heating stretcher leveling described in step 6 is 700 DEG C~800 DEG C.
7. a kind of preparation method of nuclear-power reactor austenitic stainless steel bar material according to claim 1, its feature exist
In nuclear-power reactor described in step 6 is 8.5mm~11.5mm with the diameter of section of austenitic stainless steel bar material.
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