CN106694768B - A kind of manufacture method of H13 hollow core rods - Google Patents

A kind of manufacture method of H13 hollow core rods Download PDF

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CN106694768B
CN106694768B CN201510776758.9A CN201510776758A CN106694768B CN 106694768 B CN106694768 B CN 106694768B CN 201510776758 A CN201510776758 A CN 201510776758A CN 106694768 B CN106694768 B CN 106694768B
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temperature
forging
cooled
hollow core
soaking time
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CN106694768A (en
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孟可可
雷丙旺
胡永平
任胜利
李挺
韩彩霞
王星
海英
文海燕
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Inner Mongolia North Heavy Industries Group Co Ltd
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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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

The present invention relates to a kind of manufacture method of H13 hollow core rods, belong to mold production process technical field, the present invention combines the vertical extrusion technique of ferrous metal and the accurate hollow forging technology of rotation, using vertically extruding prefabricated pipe, by rotating accurate hollow undergauge forging and molding, it can be achieved that energy saving, synergy, the purpose of raising product quality.Water cooling steel ingot of the invention to being handled through high temperature homogenization, by jumping-up, perforation, vertically it is squeezed into pipe, the accurate hollow undergauge forging of rotation is carried out using multi-pass small deformation mode, plug outside diameter dimensional tolerance reaches ± 0.5mm after forging, internal diameter size tolerance reaches ± 2mm, and by Optimizing Process Parameters, obtain mechanical property and meet RP0.2>=930MPa, Rm>=1150MPa, A >=10%, AKV2The H13 hollow core rods of >=30J.

Description

A kind of manufacture method of H13 hollow core rods
Technical field
The present invention relates to a kind of manufacture method of H13 hollow core rods, belongs to mold production process technical field.
Background technology
H13 steel core bars are the main frocks of the new-type Continuous mill train rolling seamless steel pipe of metallurgy industry, are a kind of high added values Large consumption spare part, its regular size is 107 ~ 350mm of diameter phi.With the development of Continuous mill train manufacturing technology, large-scale company The application of milling train group is more and more common, big specification or the big specification H13 steel cores of 350 ~ 460mm of φ series in φ 230 ~ 350mm series The demand of rod is also increasing.In the H13 steel core bars that use of big specification series Continuous mill train, because belonging to ultrathin long rod part, and Weight is big, is easily produced fracture during use in connecting portion, especially because plug is long overweight, easily produces curvature Excessive the problems such as causing rolled steel tube wall thickness overproof.Therefore, high-quality H13 hollow core rods are developed, mitigates plug weight, is current Domestic and international mould steel manufactures industry urgent problem to be solved.
Then past, China are added using the method for machine drilling again using the method production H13 solid mandrels of flat-die forging Work is into H13 hollow core rods.But flat-die forging technology is there are Forging Equipment Speed is slow, low production efficiency, allowance is big etc. asks Topic, machine drilling again there are waste of material it is serious the problems such as, along with the particularity of H13 Steel materials in itself, seriously constrain The application and development of H13 hollow core rods.
The content of the invention
The object of the present invention is to provide one kind can energy saving, synergy, plug outside diameter dimensional tolerance reaches ± 0.5mm, internal diameter Dimensional tolerance reaches ± 2mm, and mechanical property meets RP0.2>=930MPa, Rm>=1150MPa, A >=10%, AKV2One kind of >=30J The manufacture method of H13 hollow core rods.
The present invention combines the vertical extrusion technique of ferrous metal with rotation fine forging technology, pre- using vertical extruding Tubulation base, by rotating accurate hollow undergauge forging and molding.
Manufacture method step is as follows：
1）Smelt：Smelted using the method for arc melting+LF external refining+VD applications of vacuum, it is pure to improve molten steel Cleanliness；
2）Casting：Cast using water cooled mo(u)ld, increase the setting rate of steel ingot, to reduce segregation, improve metallurgical quality；
3）High temperature homogenization processing：Using ladder mode of heating, ingot composition and tissue is uniformed as much as possible, avoid Later stage produces banded structure because of deformation；
4）Vertical extruding：Steel ingot through jumping-up, perforation is squeezed into by pipe using ferrous metal vertical extruder, after extruding Carry out grain refining+expansion hydrogen heat treatment；
5）Rotate finish forge：Using rotary swaging machine, by way of multi-pass small deformation, hollow contracting is carried out to extrusion tube blank Footpath is forged, and carries out the empty double medium alternate cycles cooling treatments of water after forging immediately；
6）Heat treatment：Isothermal spheroidizing+high temperature normalizing+modifier treatment；High temperature normalizing is carried out before modifier treatment, can be improved Product comprehensive mechanical property, isothermal spheroidizing, high temperature normalizing and quenching use pit furnace, and tempering is added using rotation well formula Hot stove, to reduce workpiece thermal deformation, and improves tempering uniformity.
Further：Step 1）Carbon content >=0.15% in molten steel is controlled before electric furnace steel tapping, in refining process aluminium content control be Free oxygen content≤6ppm in molten steel is controlled after 0.008% ~ 0.025%, VD processing.
Further：Step 2）Cast using water cooled mo(u)ld, ensure that molten steel temperature is not less than 1560 DEG C during cast, cooling tube hydraulic pressure For 0.15 ~ 0.4MPa, 30 ~ 45 DEG C of outlet temperature position, not only ensures enough cooling velocities, but also can be to avoid cold crack Produce.
Further：Step 3）Firing rate is not higher than 80 DEG C/h, and preheating temperature is 550 ~ 600 DEG C, and soaking time is 2 ~ 3h, Heating-up temperature is 1250 ~ 1270 DEG C, and soaking time is 25 ~ 30h, and steel ingot preheating can reduce internal-external temperature difference, reduce equal after heating The warm time, avoids producing tissue overheating.
Further：Step 4）Using vertical extruding precast hollow plug pipe, extrusion temperature is 1270 ~ 1290 DEG C, extruding Grain refining+expansion hydrogen heat treatment is carried out afterwards, the workpiece after extruding is air-cooled to 320 ~ 350 DEG C first, and soaking time is 3 ~ 5h, then is added Heat is to 1030 ~ 1050 DEG C, and soaking time is 3 ~ 5h, then is air-cooled to 710 ~ 720 DEG C, and soaking time is 20 ~ 30h.
Further：Step 5）Using the accurate hollow undergauge forging and molding of rotation, initial forging temperature is 1160 ~ 1180 DEG C, finish-forging Temperature >=950 DEG C, total forging ratio >=2.0, single pass undergauge coefficient are 0.80 ~ 0.92, and axial feed velocity is 3 ~ 4m/min, week It is 10 ~ 16o to rotation angle, the forging frequency is 180 ~ 240min-1, guarantee undergauge forging dimensional accuracy, outer diameter deviation ± 0.5mm, internal diameter size deviation ± 2mm, and eliminate the overheated structure that extruding produces；The empty double medium alternatings of water are carried out after forging immediately Circulating cooling processing, workpiece enter coolant-temperature gage not less than 900 DEG C, and single water cooling and air cooling time are 60 ~ 90s, ensure that workpiece goes out Water rear surface highest rise temperature is 320 ~ 350 DEG C, and workpiece interface temperature is 320 ~ 500 DEG C, prevents the precipitation of net carbide And the generation of cold crack；When workpiece water outlet rear surface highest rise temperature of the present invention is less than 320 DEG C, workpiece turns because martensite occurs Become and crack, when workpiece water outlet rear surface highest rise temperature is higher than 350 DEG C, workpiece center portion grain boundaries easily form continuous net Shape carbide；
Further：Step 6）Isothermal spheroidizing heating-up temperature is 860 ~ 870 DEG C, and soaking time is 10 ~ 15h, with≤10 DEG C/speed of h is furnace-cooled to 790 DEG C, then be furnace-cooled to after 600 DEG C with the speed of≤20 DEG C/h come out of the stove it is air-cooled；High temperature normalizing heating temperature To spend for 1030 ~ 1050 DEG C, soaking time is 4 ~ 6h, is come out of the stove air-cooled, is again heated to 760 ± 10 DEG C, keeps the temperature 6 ~ 8h, be furnace-cooled to≤ 500 DEG C come out of the stove it is air-cooled；Quenching temperature is 1030 ~ 1040 DEG C, and soaking time is 4 ~ 6h, water cooling of coming out of the stove；Tempering heating-up temperature For 610 ~ 645 DEG C, soaking time is 8 ~ 10h, is come out of the stove air-cooled, and tempering carries out twice, and second of tempering is than first time temperature It is 10 ~ 15 DEG C high.
The present invention by jumping-up, perforation, is vertically squeezed into pipe, uses to the water cooling steel ingot handled through high temperature homogenization Multi-pass small deformation mode carries out the accurate hollow undergauge forging of rotation, and plug outside diameter dimensional tolerance reaches ± 0.5mm, internal diameter after forging Dimensional tolerance reaches ± 2mm, and by Optimizing Process Parameters, obtains mechanical property and meet RP0.2>=930MPa, Rm>=1150MPa, A >=10%, AKV2The H13 hollow core rods of >=30J, realize energy saving, synergy, improve the purpose of product quality.
Brief description of the drawings
Fig. 1 is the method for the present invention process flow chart.
Embodiment
Embodiment 1
After now the specific embodiment of the present invention is described in.
1）The smelting of H13 steel, C content before electric furnace steel tapping are carried out using arc melting, LF external refinings, VD applications of vacuum Controlling as >=0.15%, Al content control free Control for Oxygen Content after 0.008 ~ 0.025%, VD is≤6ppm in refining process, Hydrogen content control is≤1.5ppm；
2）After melting, cast using water cooled mo(u)ld, molten steel temperature is not less than 1560 DEG C during casting, and cooling tube hydraulic pressure is 0.3 ~ 0.4MPa, outlet temperature are 35 ~ 45 DEG C, and argon protective device is used in casting cycle, prevents molten steel secondary oxidation, And stringent coutroi velocity；
3）After the steel ingot demoulding, high temperature homogenization processing is carried out, preheating temperature is 550 ~ 600 DEG C, soaking time 3h, heating Temperature is 1250 ~ 1260 DEG C, soaking time 25h；
4）Jumping-up, perforation are carried out to the steel ingot handled through high temperature homogenization using 150MN hydraulic presses, then using 360MN Perforation base is squeezed into hollow core rod pipe by ferrous metal vertical extruder, and extruding heating-up temperature is 1270 DEG C, and soaking time is 5h, extrusion tube blank size are φ 762mm × φ 582mm × 6700mm（Outside diameter × internal diameter × length）；After extruding carry out grain refining+ Expand hydrogen heat treatment, the workpiece after extruding is air-cooled to 320 ~ 350 DEG C first, soaking time is 3 ~ 5h, is again heated to 1030 ~ 1050 DEG C, soaking time 4h, then 710 ~ 720 DEG C are air-cooled to, soaking time is 26 ~ 30h.
5）Undergauge forging and molding carries out extrusion tube blank using 16MN rotary swaging machines, uses multi-pass small in forging process Mode of texturing, initial forging temperature are 1160 ~ 1180 DEG C, 950 ~ 960 DEG C of final forging temperature, total forging ratio >=2.0, single pass undergauge coefficient For 0.86 ~ 0.92, axial feed velocity is 3 ~ 3.3m/min, and the angle that rotates in a circumferential direction is 10 ~ 11o, the forging frequency for 220 ~ 230min-1, the size of hollow core rod is φ 385mm × φ 103mm × 11700mm after forging, and product size technical requirements are φ 385mm × φ 104mm × 11000mm, outer diameter tolerance reach ± 0.5mm, and internal diameter size tolerance reaches ± 2mm；After forging The empty double medium alternate cycles cooling treatments of water are carried out immediately, workpiece enters coolant-temperature gage not less than 900 DEG C, the single water cooling time 80 ~ 90s, single 70 ~ 80s of air cooling time, it is 320 ~ 350 DEG C to ensure workpiece water outlet rear surface highest rise temperature, workpiece interface temperature For 320 ~ 500 DEG C, the precipitation of net carbide and the generation of cold crack are prevented；Workpiece water outlet rear surface highest of the present invention is gone up warm When degree is less than 320 DEG C, workpiece is cracked because occurring martensite transfor mation, and workpiece water outlet rear surface highest rise temperature is higher than At 350 DEG C, workpiece center portion grain boundaries easily form continuous net-shaped carbide；
6）Isothermal spheroidizing heating-up temperature is 860 ~ 870 DEG C, and soaking time is 10 ~ 15h, with the speed stove of≤10 DEG C/h Be cooled to 790 DEG C, then be furnace-cooled to after 600 DEG C with the speed of≤20 DEG C/h come out of the stove it is air-cooled；High temperature normalizing heating-up temperature is 1030 ~ 1040 DEG C, soaking time is 4 ~ 5h, is come out of the stove air-cooled, is again heated to 760 ± 10 DEG C, keeps the temperature 6 ~ 8h, be furnace-cooled to≤500 DEG C come out of the stove it is air-cooled； Quenching temperature is 1030 ~ 1040 DEG C, and soaking time is 4 ~ 6h, water cooling of coming out of the stove；Tempering heating-up temperature is 610 ~ 645 DEG C, is protected The warm time is 8 ~ 10h, is come out of the stove air-cooled, and tempering carries out twice, and second of tempering is 10 ~ 15 DEG C higher than first time temperature.Isothermal Spheroidizing, high temperature normalizing and quenching use pit furnace, and tempering is using rotation pit furnace.
Mechanical experimental results are shown in Table 1.
Embodiment 2
After now the specific embodiment of the present invention is described in.
1）The smelting of H13 steel, C content before electric furnace steel tapping are carried out using arc melting, LF external refinings, VD applications of vacuum Controlling as >=0.15%, Al content control free Control for Oxygen Content after 0.008 ~ 0.025%, VD is≤6ppm in refining process, Hydrogen content control is≤1.5ppm；
2）After melting, cast using water cooled mo(u)ld, molten steel temperature is not less than 1560 DEG C during casting, and cooling tube hydraulic pressure is 0.3 ~ 0.4MPa, outlet temperature are 35 ~ 45 DEG C, and argon protective device is used in casting cycle, prevents molten steel secondary oxidation, And stringent coutroi velocity；
3）After the steel ingot demoulding, high temperature homogenization processing is carried out, preheating temperature is 550 ~ 600 DEG C, soaking time 3h, heating Temperature is 1250 ~ 1260 DEG C, soaking time 25h；
4）Jumping-up, perforation are carried out to the steel ingot handled through high temperature homogenization using 150MN hydraulic presses, then using 360MN Perforation base is squeezed into hollow core rod pipe by ferrous metal vertical extruder, and extruding heating-up temperature is 1270 DEG C, and soaking time is 5h, extrusion tube blank size are φ 762mm × φ 582mm × 6700mm（Outside diameter × internal diameter × length）；After extruding carry out grain refining+ Expand hydrogen heat treatment, the workpiece after extruding is air-cooled to 320 ~ 350 DEG C first, soaking time is 3 ~ 5h, is again heated to 1030 ~ 1050 DEG C, soaking time 4h, then 710 ~ 720 DEG C are air-cooled to, soaking time is 26 ~ 30h.
5）Undergauge forging and molding carries out extrusion tube blank using 16MN rotary swaging machines, uses multi-pass small in forging process Mode of texturing, initial forging temperature are 1160 ~ 1180 DEG C, 950 ~ 960 DEG C of final forging temperature, total forging ratio >=2.0, single pass undergauge coefficient For 0.83 ~ 0.92, axial feed velocity is 3.4 ~ 3.6m/min, and the angle that rotates in a circumferential direction is 11 ~ 13o, the forging frequency for 230 ~ 240min-1, the size of hollow core rod is φ 385mm × φ 103mm × 11700mm after forging, and product size technical requirements are φ 385mm × φ 104mm × 11000mm, outer diameter tolerance reach ± 0.5mm, and internal diameter size tolerance reaches ± 2mm；After forging The empty double medium alternate cycles cooling treatments of water are carried out immediately, workpiece enters coolant-temperature gage not less than 900 DEG C, the single water cooling time 80 ~ 90s, single 70 ~ 80s of air cooling time, it is 320 ~ 350 DEG C to ensure workpiece water outlet rear surface highest rise temperature, workpiece interface temperature For 320 ~ 500 DEG C, the precipitation of net carbide and the generation of cold crack are prevented；Workpiece water outlet rear surface highest of the present invention is gone up warm When degree is less than 320 DEG C, workpiece is cracked because occurring martensite transfor mation, and workpiece water outlet rear surface highest rise temperature is higher than At 350 DEG C, workpiece center portion grain boundaries easily form continuous net-shaped carbide；
6）Isothermal spheroidizing heating-up temperature is 860 ~ 870 DEG C, and soaking time is 10 ~ 15h, with the speed stove of≤10 DEG C/h Be cooled to 790 DEG C, then be furnace-cooled to after 600 DEG C with the speed of≤20 DEG C/h come out of the stove it is air-cooled；High temperature normalizing heating-up temperature is 1040 ~ 1050 DEG C, soaking time is 4 ~ 5h, is come out of the stove air-cooled, is again heated to 760 ± 10 DEG C, keeps the temperature 6 ~ 8h, be furnace-cooled to≤500 DEG C come out of the stove it is air-cooled； Quenching temperature is 1030 ~ 1040 DEG C, and soaking time is 4 ~ 6h, water cooling of coming out of the stove；Tempering heating-up temperature is 610 ~ 645 DEG C, is protected The warm time is 8 ~ 10h, is come out of the stove air-cooled, and tempering carries out twice, and second of tempering is 10 ~ 15 DEG C higher than first time temperature.Isothermal Spheroidizing, high temperature normalizing and quenching use pit furnace, and tempering is using rotation pit furnace.
Mechanical experimental results are shown in Table 2

Claims (7)

1. a kind of manufacture method of H13 hollow core rods, it is characterised in that using prefabricated pipe is vertically extruded, by rotating precision Hollow undergauge forging, plug outside diameter dimensional tolerance reaches ± 0.5mm after forging, and internal diameter size tolerance reaches ± 2mm, mechanical property is made It can meet RP0.2>=930MPa, Rm>=1150MPa, A >=10%, AKV2The H13 hollow core rods of >=30J；
H13 hollow core rod manufacture methods are as follows：
1）Steel-making：Smelted using the method for electro-smelting+LF refining+VD processing；
2）Casting：Cast using water cooled mo(u)ld；
3）High temperature homogenization processing：Using ladder mode of heating；
4）Vertical extruding：Steel ingot through jumping-up, perforation is squeezed into by pipe using ferrous metal vertical extruder, is carried out after extruding Grain refining+expansion hydrogen heat treatment；
5）Swaging：Using rotary swaging machine, by way of multi-pass small deformation, hollow undergauge forging is carried out to extrusion tube blank Make, carry out the empty double medium alternate cycles cooling treatments of water after forging immediately；
6）Heat treatment：Isothermal spheroidizing+high temperature normalizing+modifier treatment, isothermal spheroidizing, high temperature normalizing and quenching use well Formula heating furnace, tempering is using rotation pit furnace.
A kind of 2. manufacture method of H13 hollow core rods according to claim 1, it is characterised in that step 1）Electric furnace steel tapping Carbon content >=0.15% in preceding control molten steel, aluminium content control is controls steel after 0.008% ~ 0.025%, VD processing in refining process Free oxygen content≤6ppm in liquid.
A kind of 3. manufacture method of H13 hollow core rods according to claim 1, it is characterised in that step 2）Using water cooling Mould is cast, and ensures that molten steel temperature is not less than 1560 DEG C during cast, and cooling tube hydraulic pressure be 0.15 ~ 0.4MPa, and outlet temperature is 30 ~ 45℃。
A kind of 4. manufacture method of H13 hollow core rods according to claim 1, it is characterised in that step 3）High temperature homogeneous When changing processing, firing rate is not higher than 80 DEG C/h, and preheating temperature is 550 ~ 600 DEG C, 2 ~ 3h of soaking time, heating-up temperature 1250 ~ 1270 DEG C, soaking time is 25 ~ 30h.
A kind of 5. manufacture method of H13 hollow core rods according to claim 1, it is characterised in that step 4）Using vertical Precast hollow plug pipe is extruded, extrusion temperature is 1270 ~ 1290 DEG C, and grain refining+expansion hydrogen heat treatment is carried out after extruding, first will Workpiece after extruding is air-cooled to 320 ~ 350 DEG C, and soaking time is 3 ~ 5h, is again heated to 1030 ~ 1050 DEG C, soaking time for 3 ~ 5h, then 710 ~ 720 DEG C are air-cooled to, soaking time is 20 ~ 30h.
A kind of 6. manufacture method of H13 hollow core rods according to claim 1, it is characterised in that step 5）Using rotation Accurate hollow undergauge forging and molding, initial forging temperature are 1160 ~ 1180 DEG C, final forging temperature >=950 DEG C, total forging ratio >=2.0, single track Secondary undergauge coefficient is 0.80 ~ 0.92, and axial feed velocity is 3 ~ 4m/min, and the angle that rotates in a circumferential direction is 10 ~ 16o, and the forging frequency is 180~240min-1, plug outside diameter dimensional tolerance reaches ± 0.5mm after ensureing forging, and internal diameter size tolerance reaches ± 2mm, and eliminates Extrude the overheated structure produced；The empty double medium alternate cycles cooling treatments of water are carried out after forging immediately, it is not low that workpiece enters coolant-temperature gage In 900 DEG C, single water cooling and air cooling time are 60 ~ 90s, and it is 320 ~ 350 to ensure workpiece water outlet rear surface highest rise temperature DEG C, workpiece interface temperature is 320 ~ 500 DEG C, suppresses the precipitation of net carbide and the generation of cold crack.
A kind of 7. manufacture method of H13 hollow core rods according to claim 1, it is characterised in that step 6）Isothermal spheroidizing Annealing heating temperature is 860 ~ 870 DEG C, and soaking time is 10 ~ 15h, and 790 DEG C are furnace-cooled to the speed of≤10 DEG C/h, then with≤20 DEG C/speed of h come out of the stove after being furnace-cooled to 600 DEG C it is air-cooled；High temperature normalizing heating-up temperature is 1030 ~ 1050 DEG C, and soaking time is 4 ~ 6h, Come out of the stove air-cooled, be again heated to 760 ± 10 DEG C, keep the temperature 6 ~ 8h, be furnace-cooled to≤500 DEG C come out of the stove it is air-cooled；Quenching temperature for 1030 ~ 1040 DEG C, soaking time is 4 ~ 6h, water cooling of coming out of the stove；Tempering heating-up temperature is 610 ~ 645 DEG C, and soaking time is 8 ~ 10h, sky of coming out of the stove Cold, tempering carries out twice, and second of tempering is 10 ~ 15 DEG C higher than first time temperature.
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