CN104561815B - A kind of high homogenizing big specification superhigh intensity rod iron and production method thereof - Google Patents
A kind of high homogenizing big specification superhigh intensity rod iron and production method thereof Download PDFInfo
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Abstract
The invention discloses a kind of high homogenizing big specification superhigh intensity rod iron, its chemical composition mass percent is: C0.25 0.40, Mn0.50 1.50, Si1.20 2.50, Cr0.80 1.20, Ni4.50 6.50, Mo0.40 1.00, V≤0.35, Nb≤0.20, S≤0.005%, P≤0.01%, O≤20PPm, N≤25PPm, remaining for Fe.Additionally providing the production method of this rod iron, its Forging Technology includes Heating Steel Ingots, a jumping-up pulling, the pulling of secondary jumping-up, three jumping-up pullings and pulling simultaneously.The high homogenizing big specification superhigh intensity rod iron good mechanical performance of the present invention, macrostructure: white macula, skin dark stain, warp-wise are to the west, year colyliform segregation all reaches AAAA rank, lateral performance reaches more than the 90% of longitudinal performance, reaches homogenizing effect.
Description
Technical field
The present invention relates to unimach field, be specifically related to a kind of high homogenizing big specification superhigh intensity rod iron, and this rod iron
Production method.
Background technology
In prior art, forging method about high strength steel is related to following report:
(1) the overall pulling first of the forging method of a CN101920304A large steel shaft forging is to be heated by forging
To initial forging temperature, forging hammer pulls out with flat anvil, reach more than effective hole seam temperature of 900 DEG C deflection 29～
31%%, to eliminate forging internal flaw；Overall pulling is that forging is heated to initial forging temperature again, enters with flat anvil on forging hammer
Row pulling, reaches deflection 15-20% more than the final forging temperature of 800 DEG C；When last setting down shapes, the single of each section becomes
Shape amount should be not less than 20%.
(2) Forging Technology 1 of the macrotype axes series parts such as CN102172766A nuclear power rotor) use WHF method to be pulled out by steel ingot
A length of flat；2) this flat is carried out vertical material jumping-up；3) WHF method is used again to pull out the steel billet after jumping-up into flat；4)
This flat is carried out the compacting of center, four sides；
(3) CN101176906 method for forging cake series forgeable piece with different directions 1) it is compacted steel ingot jaw, chamfered edge, cuts ingot tail: compacting jaw
Part, removes the corner angle of steel ingot, cuts away the rising head of steel ingot tail end, 2) axial jumping-up: by steel ingot jumping-up vertically, become oblate
Shape Forging, 3) pulling blank, cuts associated jaw portion, and oblate forging is drawn into the cuboid of square-section, and 4) will be drawn into
The cuboid forging jumping-up of square-section to cube, 5) change forging direction, by cube forging upset 90 ° carry out break-in
Forging, a upset ratio of upsetting process is reduced to 3-4 by 4-5, and 6) by cube forging chamfered edge, round as a ball one-tenth cylinder,
7) cylinder forging is upset as cheese.Upset ratio of the upsetting process described in reduction, to avoid tear zone.
(4) moulding process (1) first fire of a CN102039364A fan shaft, initial forging temperature is 1250+20
DEG C, final forging temperature is 850+20 DEG C, by steel ingot blank through pressing tongs handle, chamfered edge two step, is then placed in jumping-up drain cap, jumping-up
To diameter 1600+30mm, height is 700+30mm, with upper flat plate, lower turntable by ultra-wide anvil pulling program large deformation four times:
(2) second fire, initial forging temperature is 1230+20 DEG C, and final forging temperature is 750+20 DEG C, with the flat anvil up and down of width 600mm
Extract the first paragraph step of a diameter of 610+16mm and the second segment step of a diameter of 670+16mm, and guarantee first paragraph and
The a length of 1750+30mm of second segment, the most round as a ball, chop deflashing pincers handle, bodice rolls clearly, removes the oxide skin on surface,
Place in special drain cap, first with jumping-up disk jumping-up, then change the hydraulic press anvil gyratory compaction that width is 600mm, then
Blank is put in mould and guarantee that upper mold is full of, then the demoulding is taken out, round as a ball to diameter 1350+30mm with upper flat plate, lower turntable,
Forging is put into special drain cap again, is 600mm with width?Hydraulic press anvil on anvil gyratory compaction, upper mold is taken out, after being full of
After the most plastic after the flange step of each section of finishing.
(5) CN101972830A ultra-large type ring forging larger ratio of height to diameter ingot casting hot upsetting technique: 1) by the larger ratio of height to diameter of heating
High temperature ingot casting hangs on recessed mould, it is ensured that ingot casting and recessed mould centrage overlap, by workbench conveying ingot casting and recessed
Mould enters forcing press；2) adjust epirelief die location and guarantee that epirelief mould centrage overlaps with ingot casting, recessed mould centrage；
3) driven epirelief mould to move down by the actuating unit of forcing press, slowly apply pressure to ingot casting: start ingot casting upper surface centerline
Deforming, the outer of ingot casting lower surface deforms simultaneously, and along with epirelief mould continues to move down, the upper surface of ingot casting is gradually pasted
Mould, the cavity between lower surface and the recessed mould of ingot casting gradually fills with；4) move down further along with epirelief mould, ingot casting Gao Jing
Ratio constantly diminishes；5) by being upset the ingot casting reversing to patch mould state, movable workbench, recessed mould is replaced with flat board
Mould, has good positioning the ingot casting of reversing on flat plate mold, and epirelief mould declines further, and ingot casting ratio of height to diameter constantly diminishes, and makes
Obtain the upsetting of ingot casting lower end to put down, ingot casting upper end patch mould；6) ingot casting of above-mentioned steps will be completed, hang on another bigger forcing press, will
Epirelief mould is replaced by flat plate mold, and then the flat plate mold of top declines further, and ingot casting ratio of height to diameter constantly diminishes so that casting
Ingot upsetting is put down to required blank height dimension, completes the ingot casting hot upsetting of larger ratio of height to diameter, obtains jumping-up blank.
(6) CN101491822 open die forging ratio of height to diameter ultralimit jumping-up method and jumping-up anvil 1, a kind of open die forging ratio of height to diameter ultralimit
Jumping-up method, comprises the technical steps that:
1) upper and lower indent anvil is positioned, it is ensured that upper and lower indent anvil centrage overlaps；
2) the round ingot casting that L/D ratio is more than 3 hangs on lower indent anvil, adjusts position and guarantees aluminium alloy round cast ingot
Centrage overlaps with upper and lower indent anvil centrage；
3) after adjusting, actuating unit drive upper indent anvil to move down, slowly press to aluminium alloy round cast ingot: start aluminum
The outer of alloy circle ingot casting upper and lower end face deforms, along with upper indent anvil constantly declines, between circle ingot casting both ends of the surface and indent anvil
Cavity progressively fill up, indent anvil to circle ingot casting end face force direction the most gradually overlap with its axial line；
4) along with the further decline of upper indent anvil, extrusion ingot length is justified with diameter ratio also with the carrying out of upsetting process, its ratio
Constantly diminish；
5) will be upset round ingot casting forging fixture location to a certain extent, lower table moves, by lower indent anvil
Being replaced with flat anvil and hang on lower flat anvil by this ingot, upper indent anvil declines further, makes circle ingot casting shape in step (3), (4)
The arc lower end become is put down by upsetting；
6) upper indent anvil is replaced by flat anvil, the ingot casting of above-mentioned work step will be completed, hang, toward another, upper and lower flat anvil is installed
On bigger press, upper flat anvil continuous decrease, the arc-shaped upper ends making circle ingot casting be formed in step (3), (4) is put down to required by upsetting
Forging embryo height dimension, be finally completed L/D ratio more than 3 aluminium alloy round cast ingot jumping-up.
(7) CN101491822 open die forging ratio of height to diameter ultralimit jumping-up method and jumping-up anvil
1) upper and lower indent anvil is positioned, it is ensured that upper and lower indent anvil centrage overlaps；
2) the round ingot casting that L/D ratio is more than 3 hangs on lower indent anvil, adjusts position and guarantees aluminium alloy round cast ingot
Centrage overlaps with upper and lower indent anvil centrage；
3) after adjusting, actuating unit drive upper indent anvil to move down, slowly press to aluminium alloy round cast ingot: start aluminum
The outer of alloy circle ingot casting upper and lower end face deforms, along with upper indent anvil constantly declines, between circle ingot casting both ends of the surface and indent anvil
Cavity progressively fill up, indent anvil to circle ingot casting end face force direction the most gradually overlap with its axial line；
4) along with the further decline of upper indent anvil, extrusion ingot length is justified with diameter ratio also with the carrying out of upsetting process, its ratio
Constantly diminish；
5) will be upset round ingot casting forging fixture location to a certain extent, lower table moves, by lower indent anvil
Being replaced with flat anvil and hang on lower flat anvil by this ingot, upper indent anvil declines further, makes circle ingot casting shape in step (3), (4)
The arc lower end become is put down by upsetting；
6) upper indent anvil is replaced by flat anvil, the ingot casting of above-mentioned work step will be completed, hang, toward another, upper and lower flat anvil is installed
On bigger press, upper flat anvil continuous decrease, the arc-shaped upper ends making circle ingot casting be formed in step (3), (4) is put down to required by upsetting
Forging embryo height dimension, be finally completed L/D ratio more than 3 aluminium alloy round cast ingot jumping-up.
(8) CN1390972 ultrahigh-strength low-alloy steel one ultrahigh-strength low-alloy steel, in addition to ferrum Fe element,
The content of other elements % by weight is as follows: carbon C:0.30-0.40；Si:0.15-0.40；Mn:0.80-0.80；P:
≤0.020；S≤0.015；Cr:0.80-1.25；Mo :≤0.30；Cu :≤0.20；Ni :≤0.10；V :≤0.15；
Its grain size should be not less than 7 grades；Its yield strength σ s=860-1200Mpa, tensile strength sigma b=1000-1300Pa,
Elongation percentage δ=15-25%, impact flexibility: 0 DEG C of horizontal full-scale >=33J；This steel grade trade mark, have alloying element few, close
Gold content is low, intensity is high, production technology is simple, low cost and other advantages, it is adaptable to superhigh intensity, high collapse-resistance, ultradeep well and
Deep-sea petroleum casing pipe and box cupling.
(9) CN102212760A high-ductility ultrahigh-strength steel.A kind of high-ductility ultrahigh-strength steel, chemical composition matter
Amount percent is: C:0.20-0.35%, Mn:0.5-2.0%, Si:1.25-2.25%, Cr:2.0-5.0%, Ni:0.5-2.5
%, Mo:0.3-0.8%, Nb:0.01-0.10%, V:0.05-0.3%, S :≤0.005%, P :≤0.01%, surplus:
Fe。
(10) JP2010280962comprises (in%) copper (0.1-0.4), silicon (Si) (2.5or less),
manganese(Mn)(0.5-2),aluminum(0.05or less),niobium(0.05or less),titanium(0.05or less),
vanadium(V)(0.05or less),chromium(Cr)(2or less),molybdenum(Mo)(0.5or less),nickel(Ni)
(1or less),boron(0.005or less)and impurities(0.3-0.6)。
Above prior art can only produce the rod iron less than 400mm.
Summary of the invention
The technical problem to be solved in the present invention is to provide the big specification superhigh intensity rod iron of a kind of high homogenizing, and this rod iron specification exceedes
400mm, provides the production method of the big specification superhigh intensity rod iron of this high homogenizing simultaneously.
The technical scheme is that, a kind of high homogenizing big specification superhigh intensity rod iron, its chemical composition mass percent is: C
0.25-0.40, Mn0.50-1.50, Si1.20-2.50, Cr0.80-1.20, Ni4.50-6.50, Mo0.40-1.00,
V≤0.35, Nb≤0.20, S≤0.005%, P≤0.01%, O≤20PPm, N≤25PPm, remaining for Fe.
The high homogenizing of one big specification superhigh intensity rod iron according to the present invention, it is preferred that material therefor specification ∮ 400～∮
500mm；Vertical mixing coefficient requires: tensile strength Rm >=1760MPa, yield strength Rp0.2 >=1350MPa, elongation percentage A
>=8%, contraction percentage of area Z >=40%, impact flexibility Ak >=60J, transverse impact toughness requires to reach more than the 90% of longitudinal performance.
ASTMA604-93 inspection pressed by macrostructure, and the qualified rank of macrostructure reaches table 1 and specifies.
The qualified rank of table 1 macrostructure
| Black speck | White macula | Radially deflection | Annular tissue |
| A | A | B | B |
The chemical Composition Control of invention steel is specified by table 2, steel through high temperature refinery, be sufficiently stirred for and cast cold, pour into a mould ∮ 720mm
Steel ingot, the steel ingot annealed polishing final vacuum self-consuming furnace molten ∮ 810mm*2650mm of weight, ingot annealing rear car light, to ∮ 800mm, turns
4000 tons of quick forging machines produce.
The chemical composition of table 2 steel and control
Present invention also offers the production method of above-mentioned high homogenizing big specification superhigh intensity rod iron, water including vacuum induction melting
Injecting electrode, electrode anneal reconditioning, consumable electrode vacuum furnace remelted ingot, annealing car light, forging, annealing operation,
In described forging process, pull out including Heating Steel Ingots, a jumping-up pulling, the pulling of secondary jumping-up, three jumping-ups and pull out
Long；
Heating Steel Ingots: steel ingot cold ingot shove charge, charging temperature :≤650 DEG C；Steel ingot programming rate :≤100 DEG C/h, temperature
Rise to 800 DEG C ± 20 DEG C and be incubated 3～4 hours；Steel ingot continues to heat up, and programming rate :≤100 DEG C/h, when temperature reaches 1220
DEG C ± 20 DEG C time, steel ingot come out of the stove head forge ∮ 350mm*450mm clamp handle, ratio of height to diameter more than 3.0, steel ingot melts down insulation
Within 3～5 hours, come out of the stove forging；Steel ingot overturns after heating furnace is incubated 1-3 hour；
Jumping-up pulling: by being placed on flat anvil with ∮ 400mm-∮ 500mm hole with the steel ingot of pincers handle, clamp handle
Insert in ∮ 400mm-∮ 500mm hole, first with elongated upper anvil light compressed steel ingot, it is ensured that steel ingot two is smooth, vertical level
And reach steady statue；Then, at steel ingot upper ends flat board hammering block, quick forging machine is the most afterburning after gently pressing, and steel ingot upsetting pressure is to former
Highly less than 1/2, it is ensured that upset ratio is more than or equal to 2；The steel ingot direct drawing out of jumping-up, uses wide anvil to suppress method pulling, if
Occurring big crackle during pulling, blank melts down heating, and heating-up temperature 1200 DEG C ± 10 DEG C insulation is come out of the stove for 50-70 minute, continues
Pulling, by the octagonal forging stock of steel ingot pulling to 780mm side's chamfering；Forging stock melts down heating, heating-up temperature 1200 DEG C ± 10
DEG C insulation 80-120 minute；
Secondary jumping-up pulls out: forging stock jumping-up of coming out of the stove is to height less than 1/2, it is ensured that upset ratio is more than or equal to 2；Jumping-up steel billet pulls out extremely
To 780mm side's chamfering, blank melts down heating, and heating-up temperature 1200 DEG C ± 10 DEG C is incubated 80-120 minute；
Three jumping-up pullings: steel billet jumping-up of coming out of the stove is to height less than 1/2, it is ensured that upset ratio is more than or equal to 2；Jumping-up steel billet pulls out extremely
To 750mm side's chamfering, blank melts down heating, and heating-up temperature 1160 DEG C ± 10 DEG C is incubated 80-120 minute；
Pulling: using wide anvil to suppress method pulling, a fire forging is to finished product ∮ 400～∮ 500mm, final forging temperature 750 DEG C～850 DEG C；
Annealing is sent in forging after heat, uses normalizing+high tempering to process, and heat send temperature: 300～500 DEG C, programming rate≤100 DEG C, temperature
Degree rises to 900 DEG C ± 10 DEG C and is incubated 8～10 hours, and it is little that air cooling is warming up to 650 DEG C ± 10 DEG C insulations >=30 again to 190-210 DEG C
Time stove be cooled to 470-530 DEG C of air cooling.
In Heating Steel Ingots, the purpose of upset is to make steel ingot homogeneous temperature, the most partially temperature, prevents from bending during jumping-up；Jumping-up pulling
In, jumping-up firmly just otherwise easily to slant because steel ingot is oversize, mid portion easily forms the most bifilar type of eel-like figure；Pulling technique
In, the purpose using normalizing+high tempering to process is to refine steel crystal grain.
The production method of the high homogenizing big specification superhigh intensity rod iron according to the present invention, it is preferred that described vacuum induction melting
Watering in injecting electrode operation, 1530～1560 DEG C of cast ∮ 720mm electrodes, electrode is incubated 18-22 hour stove through 650 DEG C ± 10 DEG C
Polish after being cooled to 450-550 DEG C of air cooling annealing；Electrode is through consumable electrode vacuum furnace remelting ∮ 810mm steel ingot, and steel ingot is through 650 DEG C～670
DEG C insulation 28-32 hour annealing rear car light.
Further, described 650 DEG C ± 10 DEG C temperature retention times are 20 hours.
Further, described 650 DEG C～670 DEG C of temperature retention times are 30 hours.
Further, in described pulling operation, it is cold that air cooling to 200 DEG C is warming up to >=30 hours stoves of 650 DEG C ± 10 DEG C insulations again
To 500 DEG C of air coolings.
The invention has the beneficial effects as follows:
The invention have the characteristics that employing VIM+VAR smelting process, manufacture ∮ 810mm large steel ingot, VIM uses Gao Zhen
Empty smelt, cast cold and being sufficiently stirred for, it is ensured that chemical composition and residual elements control requirement, and cast cold reduces segregation simultaneously；
VAR weight molten process melting speed at a slow speed, rapid solidification and fine vacuum dissolve control, and further degassing simultaneously manufactures high homogenizing
Steel ingot；Steel ingot is through 1200 DEG C～1240 DEG C of samming heating, after 3 jumping-up pullings of 4000 tons of quick forging machines to 750 side's chamferings,
Blank is come out of the stove after melting down 1160 DEG C ± 10 DEG C insulations 80-120 minute, forging ∮ 400～∮ 500mm rod iron；Rod iron after forging
Using 900 DEG C ± 10 DEG C to be incubated 8～10 hours, it is cold that air cooling to 200 DEG C is warming up to >=30 hours stoves of 650 DEG C ± 10 DEG C insulations again
Process to 500 DEG C of air coolings；The sampled inspection of rod iron, macrostructure: white macula, skin dark stain, warp-wise are to the west, year colyliform segregation all reaches
To AAAA rank, lateral performance reaches more than the 90% of longitudinal performance, reaches homogenizing effect.
Detailed description of the invention
Embodiment 1
(1) VIM melting is sufficiently stirred for, and 1530 DEG C of cast ∮ 720mm electrode (steel ingot), electrode is through 650 DEG C ± 10 DEG C insulations
Polish after within 20 hours, stove is cooled to 500 DEG C of air cooling annealing.Electrode is through consumable electrode vacuum furnace remelting ∮ 810mm × 2650mm steel ingot, steel
Ingot through 30 hours annealing rear car light of 650 DEG C～670 DEG C insulations to ∮ 800mm × 2650mm (ratio of height to diameter 3.3).
(2) forging
Heating Steel Ingots: charging temperature: 650 DEG C；Steel ingot programming rate: 100 DEG C/h, it is little that temperature rises to 800 DEG C of insulations 3
Time after, steel ingot continues to heat up, and programming rate: 90 DEG C/h, when temperature reaches 1220 DEG C, and steel ingot is come out of the stove and forged ∮ at head
350mm*450mm clamps handle, and steel ingot turns in heating furnace insulation and turn 90 degrees steel ingot and melt down insulation and within 2 hours, come out of the stove forging for 2 hours.
Jumping-up pulling: will be placed on the circular flat hammering block with ∮ 400mm hole with the steel ingot of pincers handle, pincers are inserting
In ∮ 400mm hole, first with elongated upper anvil light compressed steel ingot, it is ensured that steel ingot two is smooth, and vertical level also reaches stable shape
State；Then, at steel ingot upper ends flat board hammering block, quick forging machine is the most afterburning after gently pressing, and steel ingot upsetting pressure, to former mid-height, is entered
Row pulling, pulls out steel ingot to 780mm side's chamfering (one-tenth octagonal) forging stock；Forging stock melts down heating, heating-up temperature 1200
DEG C insulation 100 minutes.
Secondary jumping-up pulls out: forging stock jumping-up of coming out of the stove pulls out to 780mm side's chamfering, blank to height less than 1/2, jumping-up steel billet
Melting down heating, heating-up temperature 1200 DEG C ± 10 DEG C is incubated 100 minutes；
Three jumping-ups pulling: steel billet jumping-up of coming out of the stove is to height less than 1/2, and little angle is fallen in the pulling of jumping-up steel billet to 750mm side, base
Material melts down heating, and heating-up temperature 1160 DEG C ± 10 DEG C is incubated 100 minutes；
Pulling: using wide anvil to suppress method pulling, a fire forging is to finished product ∮ 400, ∮ 500mm, final forging temperature 800 DEG C.After forging
Heat send annealing, heat to send temperature: 300～500 DEG C, programming rate≤100 DEG C, temperature rises to 900 DEG C ± 10 DEG C insulations 8～10
Hour, air cooling to 200 DEG C is warming up to >=30 hours stoves of 650 DEG C ± 10 DEG C insulations again and is cooled to 500 DEG C of air coolings.
Embodiment 2
(1) VIM melting is sufficiently stirred for, and 1550 DEG C of cast ∮ 720mm electrode (steel ingot), electrode is through 650 DEG C ± 10 DEG C insulations
Polish after within 20 hours, stove is cooled to 500 DEG C of air cooling annealing.Electrode is through consumable electrode vacuum furnace remelting ∮ 810mm × 2650mm (ratio of height to diameter
3.3) steel ingot, steel ingot is through 30 hours annealing rear car light of 650 DEG C～670 DEG C insulations.
(2) forging
Heating Steel Ingots: charging temperature: 650 DEG C；Steel ingot programming rate: 90 DEG C/h, it is little that temperature rises to 800 DEG C of insulations 3.5
Time after, steel ingot continues to heat up, and programming rate: 90 DEG C/h, when temperature reaches 1230 DEG C, and steel ingot is come out of the stove and forged ∮ at head
350mm*450mm clamps handle, and steel ingot turns over turnback steel ingot for 3 hours in heating furnace insulation and melts down insulation and within 1 hour, come out of the stove forging.
Jumping-up pulling: will be placed on the circular flat hammering block with ∮ 400mm hole with the steel ingot of pincers handle, pincers are inserting
In ∮ 400mm hole, first with elongated upper anvil light compressed steel ingot, it is ensured that steel ingot two is smooth, and vertical level also reaches stable shape
State；Then, at steel ingot upper ends flat board hammering block, quick forging machine is the most afterburning after gently pressing, and steel ingot upsetting pressure, to former mid-height, is entered
Row pulling, pulls out steel ingot to 780mm side's chamfering (one-tenth octagonal) forging stock；Forging stock melts down heating, heating-up temperature 1200
DEG C ± 10 DEG C be incubated 100 minutes.
Secondary jumping-up pulls out: forging stock jumping-up of coming out of the stove pulls out to 780mm side's chamfering, blank to height less than 1/2, jumping-up steel billet
Melting down heating, heating-up temperature 1200 DEG C ± 10 DEG C is incubated 100 minutes；
Three jumping-ups pulling: steel billet jumping-up of coming out of the stove is to height less than 1/2, and little angle is fallen in the pulling of jumping-up steel billet to 750mm side, base
Material melts down heating, and heating-up temperature 1160 DEG C ± 10 DEG C is incubated 100 minutes；
Pulling: using wide anvil to suppress method pulling, a fire forging is to finished product ∮ 400, ∮ 500mm, final forging temperature 820 DEG C.After forging
Heat send annealing, heat to send temperature: 300～500 DEG C, programming rate≤100 DEG C, temperature rises to 900 DEG C ± 10 DEG C insulations 8～10
Hour, air cooling to 200 DEG C is warming up to >=30 hours stoves of 650 DEG C ± 10 DEG C insulations again and is cooled to 500 DEG C of air coolings.
The chemical composition of steel of the present invention is as shown in table 3.
The chemical composition (wt%) of table 3. embodiment of the present invention steel ingot
| C | Mn | Si | S | P | Ni | Cr | Mo | V | O | N | |
| Embodiment 1 | 0.31 | 0.76 | 1.78 | 0.001 | 0.003 | 5.60 | 1.17 | 0.64 | 0.12 | 0.0005 | 0.0010 |
| Embodiment 2 | 0.32 | 0.75 | 1.85 | 0.001 | 0.003 | 5.65 | 1.12 | 0.62 | 0.14 | 0.0005 | 0.0011 |
Steel of the present invention big specification rod iron mechanical property is as shown in table 4.
Table 4 ∮ 500 rod iron mechanical property
Steel of the present invention produces ∮ 400, the inspection of ∮ 500 rod iron horizontal macrostructure as shown in table 5.
Table 5 ∮ 400, ∮ 500 rod iron macrostructure are graded
The present invention obtains above-mentioned material and first has to obtain chemical composition and the steel ingot of even tissue, smelting process: use vacuum induction
Stove+consumable electrode vacuum furnace molten smelting refusion and smelting technique of weight；Vaccum sensitive stove cast ∮ 720mm electrode steel ingot, electrode steel ingot is annealed
Rear polishing, the consumable electrode vacuum furnace molten ∮ 810mm*2650mm of weight, ingot annealing rear car light is up to 3 to ∮ 800mm, ratio of height to diameter
Above.By the improvement to smelting process and Forging Technology, the present invention has obtained the high intensity rod iron of a kind of big specification of high homogenizing,
High homogenizing be mainly reflected in mirco structure and macrostructure uniformly, vertically and horizontally mechanical property reach unanimity.Macrostructure: white macula,
Skin dark stain, warp-wise are to the west, year colyliform segregation all reaches AAAA rank, and lateral performance reaches more than the 90% of longitudinal performance, reaches
To homogenizing effect.
Claims (6)
1. a production method for high homogenizing big specification superhigh intensity rod iron, waters injecting electrode, electrode anneal reconditioning, consumable electrode vacuum furnace remelted ingot, annealing car light, forging, annealing operation including vacuum induction melting, it is characterised in that:
The chemical composition mass percent of described rod iron is: C 0.25-0.40, Mn 0.50-1.50, Si 1.20-2.50, Cr 0.80-1.20, Ni 4.50-6.50, Mo 0.40-1.00, V≤0.35, Nb≤0.20, S≤0.005, P≤0.01, O≤20ppm, N≤25ppm, remaining for Fe；
In described forging process, including Heating Steel Ingots, a jumping-up pulling, the pulling of secondary jumping-up, three jumping-up pullings and pulling；
Heating Steel Ingots: steel ingot cold ingot shove charge, charging temperature :≤650 DEG C；Steel ingot programming rate :≤100 DEG C/h, temperature rises to 800 DEG C ± 20 DEG C and is incubated 3～4 hours；Steel ingot continues to heat up, programming rate :≤100 DEG C/h, and when temperature reaches 1220 DEG C ± 20 DEG C, steel ingot is come out of the stove and forged φ 350mm*450mm pincers handle, ratio of height to diameter more than 3.0 at head, and steel ingot melts down and is incubated forging of coming out of the stove for 3～5 hours；Steel ingot overturns after heating furnace is incubated 1-3 hour；
Jumping-up pulling: will be placed on flat anvil with φ 400mm-φ 500mm hole with the steel ingot of pincers handle, pincers are inserting in φ 400mm-φ 500mm hole, first with elongated upper anvil light compressed steel ingot, it is ensured that steel ingot two is smooth, and vertical level also reaches steady statue；Then, at steel ingot upper ends flat board hammering block, quick forging machine is the most afterburning after gently pressing, and steel ingot upsetting pressure is to former height less than 1/2, it is ensured that upset ratio is more than or equal to 2；The steel ingot direct drawing out of jumping-up, uses wide anvil to suppress method pulling, if there is big crackle during pulling, blank melts down heating, and heating-up temperature 1200 DEG C ± 10 DEG C insulation is come out of the stove for 50-70 minute, continues pulling, by the octagonal forging stock of steel ingot pulling to 780mm side's chamfering；Forging stock melts down heating, and heating-up temperature 1200 DEG C ± 10 DEG C is incubated 80-120 minute；
Secondary jumping-up pulls out: forging stock jumping-up of coming out of the stove is to height less than 1/2, it is ensured that upset ratio is more than or equal to 2；Jumping-up steel billet pulls out to 780mm side's chamfering, and blank melts down heating, and heating-up temperature 1200 DEG C ± 10 DEG C is incubated 80-120 minute；
Three jumping-up pullings: steel billet jumping-up of coming out of the stove is to height less than 1/2, it is ensured that upset ratio is more than or equal to 2；The pulling of jumping-up steel billet is to 750mm side's chamfering, and blank melts down heating, and heating-up temperature 1160 DEG C ± 10 DEG C is incubated 80-120 minute；
Pulling: using wide anvil to suppress method pulling, a fire forging is to finished product φ 400～φ 500mm, final forging temperature 750 DEG C～850 DEG C；Annealing is sent in forging after heat, using normalizing+high tempering to process, heat send temperature: 300～500 DEG C, programming rate≤100 DEG C, temperature rises to 900 DEG C ± 10 DEG C and is incubated 8～10 hours, and air cooling is warming up to >=30 hours stoves of 650 DEG C ± 10 DEG C insulations again and is cooled to 470-530 DEG C of air cooling to 190-210 DEG C.
The production method of high homogenizing the most according to claim 1 big specification superhigh intensity rod iron, it is characterized in that, described vacuum induction melting waters in injecting electrode operation, 1530～1560 DEG C of cast φ 720mm electrodes, electrode polishes after 18-22 hour stove of 650 DEG C ± 10 DEG C insulations is cooled to 450-550 DEG C of air cooling annealing；Electrode is through consumable electrode vacuum furnace remelting φ 810mm steel ingot, and steel ingot is through 28-32 hour annealing rear car light of 650 DEG C～670 DEG C insulations.
The production method of high homogenizing the most according to claim 2 big specification superhigh intensity rod iron, it is characterised in that described 650 DEG C ± 10 DEG C temperature retention times are 20 hours.
The production method of high homogenizing the most according to claim 2 big specification superhigh intensity rod iron, it is characterised in that described 650 DEG C～670 DEG C of temperature retention times are 30 hours.
The production method of high homogenizing the most according to claim 1 big specification superhigh intensity rod iron, it is characterised in that in described pulling operation, air cooling to 200 DEG C is warming up to >=30 hours stoves of 650 DEG C ± 10 DEG C insulations again and is cooled to 500 DEG C of air coolings.
The production method of high homogenizing the most according to claim 1 big specification superhigh intensity rod iron, it is characterised in that material therefor specificationVertical mixing coefficient requires: tensile strength Rm >=1760MPa, yield strength Rp0.2>=1350MPa, elongation percentage A >=8%, contraction percentage of area Z >=40%, impact flexibility Ak >=60J, transverse impact toughness requires to reach more than the 90% of longitudinal performance.
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