CN106694768A - Manufacturing method of H13 hollow core rod - Google Patents

Manufacturing method of H13 hollow core rod Download PDF

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Publication number
CN106694768A
CN106694768A CN201510776758.9A CN201510776758A CN106694768A CN 106694768 A CN106694768 A CN 106694768A CN 201510776758 A CN201510776758 A CN 201510776758A CN 106694768 A CN106694768 A CN 106694768A
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temperature
forging
cooled
soaking time
hollow core
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CN106694768B (en
Inventor
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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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 invention relates to a manufacturing method of an H13 hollow core rod and belongs to the technical field of mold manufacturing processes. According to the manufacturing method, a vertical extruding technology of black metal is combined with a rotating precision hollow forging technology, a pipe blank is prefabricated through vertical extruding, and the purposes of saving energy, improving the effect and improving the product quality can be achieved through rotating precision hollow hole shrinkage forging and forming. According to the manufacturing method, a water-cooled steel ingot subjected to high temperature homogenizing treatment is subjected to upsetting, hole punching and vertical extruding to form the pipe blank; rotating precision hollow hole shrinkage forging is performed in a multi-pass small-deformation manner; the outer diameter size tolerance of the forged core rod reaches +/-0.5 mm, the inner diameter size tolerance reaches +/-2 mm, and by optimizing the process parameters, the H13 hollow core rod with the mechanical performance meeting that RP0.2>=930 MPa, Rm>=1150 MPa, A>=10% and AKV2>=30J is obtained.

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, belong 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 be 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 universal, big specification or the big specification H13 steel cores of 350 ~ 460mm of φ series in 230 ~ 350mm of φ 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, and easily fracture is produced in connecting portion during use, especially because plug is long overweight, easily produces flexibility It is excessive the problems such as cause rolled steel tube wall thickness overproof.Therefore, high-quality H13 hollow core rods are developed, mitigates plug weight, be current Domestic and international mould steel manufactures industry problem demanding prompt solution.
Then past, China 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 has that Forging Equipment Speed is slow, low production efficiency, and allowance is big etc. asks There is waste of material again, along with H13 Steel materials particularity in itself, seriously constrain in topic, machine drilling The application and development of H13 hollow core rods.
The content of the invention
It is an object of the invention to provide one kind can energy-conservation, synergy, plug external 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, improved Molten Steel Cleanliness；
2）Casting：Cast using water cooled mo(u)ld, increased the setting rate of steel ingot, to reduce segregation, improved metallurgical quality；
3）High temperature homogenization treatment：Using ladder mode of heating, ingot composition and tissue is set to uniform as much as possible, it is to avoid the later stage Because deformation produces banded structure；
4）Vertical extruding：Pipe will be squeezed into through the steel ingot of jumping-up, perforation using ferrous metal vertical extruder, carried out after extruding Grain refining+expansion hydrogen heat treatment；
5）Rotation finish forge：Using rotary swaging machine, by way of multi-pass small deformation, hollow undergauge forging is carried out to extrusion tube blank Make, enter the empty double medium alternate cycles cooling treatments of water-filling after forging immediately；
6）Heat treatment：Isothermal spheroidizing+high temperature normalizing+modifier treatment；High temperature normalizing is carried out before modifier treatment, product can be improved Comprehensive mechanical property, isothermal spheroidizing, high temperature normalizing and quenching use pit furnace, and tempering is using the formula heating of rotation well 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, aluminium content is controlled in refining process Free oxygen content≤6ppm in molten steel is controlled after 0.008% ~ 0.025%, VD treatment.
Further：Step 2）Cast using water cooled mo(u)ld, ensure that molten steel temperature is not less than 1560 DEG C, cooling tube hydraulic pressure during cast It is 0.15 ~ 0.4MPa, 30 ~ 45 DEG C of outlet temperature position not only ensures enough cooling velocities, and can 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, it is to avoid produce tissue overheat.
Further：Step 4）Using vertical extruding precast hollow plug pipe, extrusion temperature is 1270 ~ 1290 DEG C, extruding After carry out the heat treatment of grain refining+expansion hydrogen, the workpiece after extruding is air cooled to 320 ~ 350 DEG C first, soaking time is 3 ~ 5h, then is added To 1030 ~ 1050 DEG C, soaking time is 3 ~ 5h to heat, then is air cooled to 710 ~ 720 DEG C, and soaking time is 20 ~ 30h.
Further：Step 5）Using accurate hollow undergauge forging and molding is rotated, initial forging temperature is 1160 ~ 1180 DEG C, finish-forging Temperature >=950 DEG C, total forging ratio >=2.0, single pass undergauge coefficient is 0.80 ~ 0.92, and axial feed velocity is 3 ~ 4m/min, week It is 10 ~ 16o to the anglec of rotation, the forging frequency is 180 ~ 240min-1, it is ensured that undergauge forging dimensional accuracy, outside dimension deviation ± 0.5mm, internal diameter size deviation ± 2mm, and eliminate the overheated structure that extruding is produced；Enter the empty double media of water-filling after forging immediately to replace Circulating cooling treatment, workpiece enters coolant-temperature gage and is not less than 900 DEG C, and single water-cooled and air cooling time are 60 ~ 90s, it is ensured that workpiece goes out Surface highest rise temperature is 320 ~ 350 DEG C after water, and workpiece interface temperature is 320 ~ 500 DEG C, prevents the precipitation of net carbide And the generation of cold crack；When highest rise temperature in surface is less than 320 DEG C after workpiece water outlet of the present invention, workpiece turns because there is martensite Become and crack, when surface highest rise temperature is higher than 350 DEG C after workpiece water outlet, 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/h Speed stove be cooled to 790 DEG C, then air cooling of being come out of the stove after 600 DEG C is cooled to the speed stove of≤20 DEG C/h；High temperature normalizing heating-up temperature is 1030 ~ 1050 DEG C, soaking time is 4 ~ 6h, and air cooling of coming out of the stove is again heated to 760 ± 10 DEG C, is incubated 6 ~ 8h, and stove is cooled to≤500 DEG C Come out of the stove air cooling；Quenching temperature is 1030 ~ 1040 DEG C, and soaking time is 4 ~ 6h, water-cooled of coming out of the stove；Tempering heating-up temperature be 610 ~ 645 DEG C, soaking time is 8 ~ 10h, and air cooling of coming out of the stove, tempering is carried out twice, and second tempering is higher than first time temperature by 10 ~ 15 ℃。
The present invention by jumping-up, perforation, is vertically squeezed into pipe to the water-cooled steel ingot processed through high temperature homogenization, uses Multi-pass small deformation mode carries out the accurate hollow undergauge forging of rotation, and plug external 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 the purpose of energy-conservation, synergy, improve product quality.
Brief description of the drawings
Fig. 1 is the inventive method process chart.
Specific embodiment
Embodiment 1
After now specific embodiment of the 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 >=0.15% is controlled to, Al content control free Control for Oxygen Content after 0.008 ~ 0.025%, VD is≤6ppm in refining process, Hydrogen content is controlled to≤1.5ppm；
2）After melting, to be cast using water cooled mo(u)ld, molten steel temperature is not less than 1560 DEG C during casting, cooling tube hydraulic pressure is 0.3 ~ 0.4MPa, outlet temperature is 35 ~ 45 DEG C, and argon protective device is used in casting cycle, prevents molten steel secondary oxidation, and strictly Coutroi velocity；
3）After the steel ingot demoulding, high temperature homogenization treatment is carried out, preheating temperature is 550 ~ 600 DEG C, and soaking time is 3h, heating-up temperature It it is 1250 ~ 1260 DEG C, soaking time is 25h；
4）Jumping-up, perforation are carried out to the steel ingot processed through high temperature homogenization using 150MN hydraulic presses, then using 360MN black Perforation base is squeezed into hollow core rod pipe by metallic vertical extruder, and extruding heating-up temperature is 1270 DEG C, and soaking time is 5h, is squeezed Pressure tube blank size is φ 762mm × φ 582mm × 6700mm（External diameter × internal diameter × length）；Grain refining+expansion hydrogen is carried out after extruding Heat treatment, is air cooled to 320 ~ 350 DEG C by the workpiece after extruding first, and soaking time is 3 ~ 5h, is again heated to 1030 ~ 1050 DEG C, Soaking time is 4h, then is air cooled to 710 ~ 720 DEG C, and soaking time is 26 ~ 30h.
5）Undergauge forging and molding is carried out to extrusion tube blank using 16MN rotary swaging machines, it is small using multi-pass in forging process Mode of texturing, initial forging temperature is 1160 ~ 1180 DEG C, 950 ~ 960 DEG C of final forging temperature, total forging ratio >=2.0, single pass undergauge coefficient Be 0.86 ~ 0.92, axial feed velocity be 3 ~ 3.3m/min, the angle that rotates in a circumferential direction be 10 ~ 11o, forging the frequency be 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, outside dimension tolerance reaches ± 0.5mm, and internal diameter size tolerance reaches ± 2mm；After forging Enter the empty double medium alternate cycles cooling treatments of water-filling immediately, workpiece enters coolant-temperature gage and is not less than 900 DEG C, the single water-cooled time 80 ~ 90s, 70 ~ 80s of single air cooling time, it is ensured that surface highest rise temperature is 320 ~ 350 DEG C, workpiece interface temperature after workpiece water outlet It is 320 ~ 500 DEG C, prevents the precipitation of net carbide and the generation of cold crack；Surface highest is gone up warm after workpiece water outlet of the present invention When degree is less than 320 DEG C, workpiece is cracked because there is martensite transfor mation, and highest rise temperature in surface is higher than after workpiece water outlet 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, is cooled to the speed stove of≤10 DEG C/h 790 DEG C, then air cooling of being come out of the stove after 600 DEG C is cooled to the speed stove of≤20 DEG C/h；High temperature normalizing heating-up temperature is 1030 ~ 1040 DEG C, Soaking time is 4 ~ 5h, and air cooling of coming out of the stove is again heated to 760 ± 10 DEG C, is incubated 6 ~ 8h, and stove is cooled to≤500 DEG C of air coolings of coming out of the stove；Quenching Heating-up temperature is 1030 ~ 1040 DEG C, and soaking time is 4 ~ 6h, water-cooled of coming out of the stove；Tempering heating-up temperature is 610 ~ 645 DEG C, during insulation Between be 8 ~ 10h, air cooling of coming out of the stove, tempering is carried out twice, and second tempering is higher than first time temperature 10 ~ 15 DEG C.Isothermal spheroidizing Annealing, 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 specific embodiment of the 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 >=0.15% is controlled to, Al content control free Control for Oxygen Content after 0.008 ~ 0.025%, VD is≤6ppm in refining process, Hydrogen content is controlled to≤1.5ppm；
2）After melting, to be cast using water cooled mo(u)ld, molten steel temperature is not less than 1560 DEG C during casting, cooling tube hydraulic pressure is 0.3 ~ 0.4MPa, outlet temperature is 35 ~ 45 DEG C, and argon protective device is used in casting cycle, prevents molten steel secondary oxidation, and strictly Coutroi velocity；
3）After the steel ingot demoulding, high temperature homogenization treatment is carried out, preheating temperature is 550 ~ 600 DEG C, and soaking time is 3h, heating-up temperature It it is 1250 ~ 1260 DEG C, soaking time is 25h；
4）Jumping-up, perforation are carried out to the steel ingot processed through high temperature homogenization using 150MN hydraulic presses, then using 360MN black Perforation base is squeezed into hollow core rod pipe by metallic vertical extruder, and extruding heating-up temperature is 1270 DEG C, and soaking time is 5h, is squeezed Pressure tube blank size is φ 762mm × φ 582mm × 6700mm（External diameter × internal diameter × length）；Grain refining+expansion hydrogen is carried out after extruding Heat treatment, is air cooled to 320 ~ 350 DEG C by the workpiece after extruding first, and soaking time is 3 ~ 5h, is again heated to 1030 ~ 1050 DEG C, Soaking time is 4h, then is air cooled to 710 ~ 720 DEG C, and soaking time is 26 ~ 30h.
5）Undergauge forging and molding is carried out to extrusion tube blank using 16MN rotary swaging machines, it is small using multi-pass in forging process Mode of texturing, initial forging temperature is 1160 ~ 1180 DEG C, 950 ~ 960 DEG C of final forging temperature, total forging ratio >=2.0, single pass undergauge coefficient Be 0.83 ~ 0.92, axial feed velocity be 3.4 ~ 3.6m/min, the angle that rotates in a circumferential direction be 11 ~ 13o, forging the frequency be 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, outside dimension tolerance reaches ± 0.5mm, and internal diameter size tolerance reaches ± 2mm；After forging Enter the empty double medium alternate cycles cooling treatments of water-filling immediately, workpiece enters coolant-temperature gage and is not less than 900 DEG C, the single water-cooled time 80 ~ 90s, 70 ~ 80s of single air cooling time, it is ensured that surface highest rise temperature is 320 ~ 350 DEG C, workpiece interface temperature after workpiece water outlet It is 320 ~ 500 DEG C, prevents the precipitation of net carbide and the generation of cold crack；Surface highest is gone up warm after workpiece water outlet of the present invention When degree is less than 320 DEG C, workpiece is cracked because there is martensite transfor mation, and highest rise temperature in surface is higher than after workpiece water outlet 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, is cooled to the speed stove of≤10 DEG C/h 790 DEG C, then air cooling of being come out of the stove after 600 DEG C is cooled to the speed stove of≤20 DEG C/h；High temperature normalizing heating-up temperature is 1040 ~ 1050 DEG C, Soaking time is 4 ~ 5h, and air cooling of coming out of the stove is again heated to 760 ± 10 DEG C, is incubated 6 ~ 8h, and stove is cooled to≤500 DEG C of air coolings of coming out of the stove；Quenching Heating-up temperature is 1030 ~ 1040 DEG C, and soaking time is 4 ~ 6h, water-cooled of coming out of the stove；Tempering heating-up temperature is 610 ~ 645 DEG C, during insulation Between be 8 ~ 10h, air cooling of coming out of the stove, tempering is carried out twice, and second tempering is higher than first time temperature 10 ~ 15 DEG C.Isothermal spheroidizing Annealing, high temperature normalizing and quenching use pit furnace, and tempering is using rotation pit furnace.
Mechanical experimental results are shown in Table 2

Claims (8)

1. a kind of manufacture method of H13 hollow core rods, it is characterised in that accurate by rotating using prefabricated pipe is vertically extruded Hollow undergauge forging, plug external diameter dimensional tolerance reaches ± 0.5mm after forging, and internal diameter size tolerance reaches ± 2mm, is made mechanical property R can be metP0.2>=930MPa, Rm>=1150MPa, A >=10%, AKV2The H13 hollow core rods of >=30J.
2. the manufacture method of a kind of H13 hollow core rods according to claim 1, it is characterised in that manufacture method step is such as Under：
1）Steel-making：Smelted using the method for electro-smelting+LF refining+VD treatment；
2）Casting：Cast using water cooled mo(u)ld；
3）High temperature homogenization treatment：Using ladder mode of heating；
4）Vertical extruding：Pipe will be squeezed into through the steel ingot of jumping-up, perforation using ferrous metal vertical extruder, 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, enter the empty double medium alternate cycles cooling treatments of water-filling 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.
3. a kind of manufacture method of H13 hollow core rods according to claim 2, it is characterised in that step 1）Electric furnace steel tapping Carbon content >=0.15% in preceding control molten steel, aluminium content controls steel after being controlled to 0.008% ~ 0.025%, VD treatment in refining process Free oxygen content≤6ppm in liquid.
4. a kind of manufacture method of H13 hollow core rods according to claim 2, it is characterised in that step 2）Using water-cooled Mould is cast, and ensures that molten steel temperature is not less than 1560 DEG C during cast, and cooling tube hydraulic pressure is 0.15 ~ 0.4MPa, and outlet temperature is 30 ~ 45℃。
5. a kind of manufacture method of H13 hollow core rods according to claim 2, it is characterised in that step 3）High temperature homogeneous When changing treatment, firing rate is not higher than 80 DEG C/h, and preheating temperature is 550 ~ 600 DEG C, and 2 ~ 3h of soaking time, heating-up temperature is 1250 ~ 1270 DEG C, soaking time is 25 ~ 30h.
6. a kind of manufacture method of H13 hollow core rods according to claim 2, it is characterised in that step 4）Using vertical Extruding precast hollow plug pipe, 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, and soaking time is 3 ~ 5h, then it is air cooled to 710 ~ 720 DEG C, soaking time is 20 ~ 30h.
7. a kind of manufacture method of H13 hollow core rods according to claim 2, it is characterised in that step 5）Using rotation Accurate hollow undergauge forging and molding, initial forging temperature is 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, it is ensured that plug external diameter dimensional tolerance reaches ± 0.5mm after forging, and internal diameter size tolerance reaches ± 2mm, and eliminates Extrude the overheated structure for producing；Enter the empty double medium alternate cycles cooling treatments of water-filling after forging immediately, it is not low that workpiece enters coolant-temperature gage In 900 DEG C, single water-cooled and air cooling time are 60 ~ 90s, it is ensured that surface highest rise temperature is 320 ~ 350 after workpiece water outlet DEG C, workpiece interface temperature is 320 ~ 500 DEG C, suppresses the precipitation of net carbide and the generation of cold crack.
8. a kind of manufacture method of H13 hollow core rods according to claim 2, 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 cooled to the speed stove of≤10 DEG C/h, then with≤20 DEG C/the speed stove of h comes out of the stove air cooling after being cooled to 600 DEG C；High temperature normalizing heating-up temperature is 1030 ~ 1050 DEG C, and soaking time is 4 ~ 6h, Come out of the stove air cooling, be again heated to 760 ± 10 DEG C, be incubated 6 ~ 8h, stove is cooled to≤500 DEG C of air coolings of coming out of the stove；Quenching temperature be 1030 ~ 1040 DEG C, soaking time is 4 ~ 6h, water-cooled 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 is carried out twice, and second tempering is higher than first time temperature 10 ~ 15 DEG C.
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