CN108130476A - Large high-strength alloy steel hook forging and production method - Google Patents
Large high-strength alloy steel hook forging and production method Download PDFInfo
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- CN108130476A CN108130476A CN201711251082.7A CN201711251082A CN108130476A CN 108130476 A CN108130476 A CN 108130476A CN 201711251082 A CN201711251082 A CN 201711251082A CN 108130476 A CN108130476 A CN 108130476A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The present invention relates to a kind of total height up to 2840mm, the wide 2030mm of coupler body, net weight 7.7t, unit lifting tonnage be 4500t large high-strengths alloy steel hook forging and production method, mass percent (%)：C 0.13~0.18, Si 0.17~0.37, Mn 0.30~0.60, Cr 0.90~1.20, Mo 0.20~0.27, V 0.03~0.08, Ni 2.60~3.00, Cu≤0.25, P≤0.020, S≤0.015, remaining Fe.Advantage：It is that forging surface quality and ultrasonic examination should meet the requirement of CCS classification societies；Second is that the low-temperature impact work of the material is effectively improved, Akv2 (30 DEG C) >=42J.
Description
Technical field
It is up to 2840mm, the wide 2030mm of coupler body, net weight 7.7t, unit lifting tonnage the present invention relates to a kind of total height
4500t large high-strengths alloy steel hook forging and production method belong to suspension hook manufacturing field.
Background technology
The exploitation of large high-strength steel alloy hanging product is for marine engineering ship (such as large-scale crane ship, pipe laying barge, digging
Mud ship, large-scale shipyard gantry crane and drilling platforms etc.) in large-scale crampon, with the development of industrial level, in nuclear power, ship
Application and development on oceangoing ship marine industry is swift and violent, in the case that the volume and weight of single mechanism part is increasing, only big
The lower assembling work that could complete large ship and nuclear power projects of type crane auxiliary.Such as offshore crane mechanical equipment be across
Extra large bridge construction, Oversea wind, power plant, oil drilling platform construction, marine ships, which go through dangers to rescue, builds essential
Heavy equipment is one of important equipment of marine engineering operation.As global Oil Gas is in great demand and crude oil price Continued, sea
The demand of upper drilling well service also continues to increase, and the construction of Wind Power Plant at Sea is also increasingly emerging under national new energy plan support
It rises, the demand of following sea lifting equipment will further increase, and lifting tonnage further expands.
Invention content
Purpose of design：At home on the basis of material, design a kind of large-scale hoisting weight and hung for 4500t high strength alloy steels
Hook and production method.
In order to realize above-mentioned purpose of design, the present invention according to 4500t high-strength alloys steel hook there is finishing shape to answer
It is miscellaneous, build is huge --- total height reach 2840mm, the wide 2030mm of coupler body, net weight 7.7t, unit lifting tonnage be 4500t, size essence
High processing characteristic is spent, on design of material, mass percent (%)：C 0.13~0.18, Si 0.17~0.37, Mn
0.30~0.60, Cr 0.90~1.20, Mo 0.20~0.27, V 0.03~0.08, Ni 2.60~3.00, Cu≤0.25, P
≤ 0.020, S≤0.015, remaining Fe.In order to meet low-temperature impact toughness value of the product at -30 DEG C, as defined in material satisfaction
The special content for being added to chemical element Al on the basis of chemical composition requirement.Al is added in steelmaking process as end-deoxidizer, refining
Steel final deoxidizing addition can play crystal grain thinning, it is tough to improve impact generally 1% or so, and in the presence of Al is as trace element
The effect of property.Also there is inoxidizability and corrosion resistance simultaneously.With reference to this item purpose component requirements, the amount of the inserting control of Al elements
System exists：0.020~0.035%.
In order to realize above-mentioned purpose of design, the present invention devises following forging technology scheme to obtain enough forgings
Than.A. steel ingot is come out of the stove after soak, uses jumping-up between spherical surface upset plate upper flat plate, lower platform and heavy reduction diameter
To flattening side's pulling (like this process upsetting pull twice)；B. ejection is preforming, and heat chops riser；C. the jumping-up in drain cap, and use
Special drain cap impression；D. bar portion is clamped, after putting on the special tooling side of pulling out to process requirement, finishing, alignment molding.By above-mentioned
The practical forging ratio of coupler body of process program forging molding has reached 5.5, and the forging ratio more than 3.0 much larger than general provision will
It asks.Meanwhile the special tooling used in forging process, the effect inside compacting coupler body is not only acted as, and greatly reduce
Machining amount during forging blank to roughing semi-finished product, reduces manufacturing cost, shortens the process-cycle.
In order to realize above-mentioned purpose of design, the present invention is in forging process：Suspension hook forging weight 27.5t, select 35t plum blossoms ingot into
Row forging；1250 ± 20 DEG C of initial forging temperature；800 ± 20 DEG C of final forging temperature；Coupler body part forging ratio 5.5；Bar portion forging ratio
16.8；Five fire time completion of forging point, i.e.,：
First fire, chamfered edge is round as a ball after steel ingot is come out of the stove and the fervent mouth of a river, cleaning both ends of the surface, returns stove heat, sees Fig. 4；
Second fire, blank band spherical surface upset plate jumping-up to 2100mm, and the pulling of heavy reduction flattening side is returned to ￠ 1350mm
Stove heat is shown in Fig. 5-1 and 5-2；
Third fire, the blank band secondary jumping-up of spherical surface upset plate to 2100mm, and heavy reduction flattening side is pulled out to ￠
1450mm, number print, ejection is preforming, and heat chops riser, returns stove heat；
Preforming blank is put into drain cap gathering stock to 1810mm about 1250mm high by the 4th fire, then with special drain cap
Jumping-up, impression to 2100mm about 920mm high, return stove heat；
5th fire, clamps bar portion, and behind the special drain cap side of pulling out to process requirement, Fig. 8-1 is shown in finishing, alignment molding
And 8-2.
In order to realize above-mentioned purpose of design, during heat treatment after forging of the present invention：Due to containing Cr, Ni, Mo, V member in steel alloy
Element is susceptibility of flake formation steel, so the forging that steel ingot is swaged into will carry out heat treatment after forging into stove in time.
The heat treatment after forging of forging should take normalizing to add temper.300 DEG C or so should be subcooled to after forging process for fuel
Heat preservation 10 hours by being fully subcooled, makes forging center portion be cooled to isothermal temperature, to improve core structure, then difficult to understand through recrystallization
After family name's body, 300 DEG C of ± 10 DEG C of heat preservations are subcooled to, 650 DEG C of ± 10 DEG C of heat preservations is heated to and expands hydrogen.The process advan is brilliant in refinement
Grain uniform formation, and the effect for expanding hydrogen is more preferable.The specific normalizing of suspension hook forging+tempering process curve is as shown in Figure 2.
In order to realize above-mentioned purpose of design, the quality of final heat treatment effect, for the synthesis mechanical property of alloy steel forging
Can, particularly low-temperature impact toughness has a direct impact.It is seen according to the situation of trial-production, each link of final heat treatment, it all should son
It is thin to consider, it just can guarantee the forging after heat treatment in this way, through physical and chemical testing, once reach technical standard requirement.For this reason, it may be necessary to handle
Hold following heat treatment process main points：
A. quenched preceding increase normalizing process
Increase normalizing process before modifier treatment to be necessary, especially for the forging of larger cross-section, it appears even more important.Just
Fiery temperature selection is higher, and soaking time selection is longer, it is therefore an objective to and alloying element is made fully to be dissolved and homogenize, it can be into one
Crystal grain thinning is walked, uniform formation performs tissue preparation for modifier treatment.
B. it is fully cooled during quenched quenching
Cooling during quenched quenching, be alloy steel forging heat treatment key link, no matter technics institution and technological operation
Implement, all should give attention, it has to be noted that the following：The forging mode of being loaded will ensure that forging heating and cooling are uniformly abundant,
Being loaded when being particularly heat-treated is more very important, and forging should keep enough metric spaces；Water temperature is less than always during quenching
It 50 DEG C, when particularly water temperature is high, more should strictly control；Achieve the purpose that forging is fully cooled in water, cooling pond will have
Enough capacity, while in quenching process, the water in pond can carry out big flow cycle, fully supplement cold water.Simultaneously,
Intensely stirred with compressed air, forging in water can also upper and lower play, make hot water around forging and bubble quickly
Convention diffusion.
C. it is tempered in time after quenching, reasonably selects temperature
It should be tempered in time after quenched quenching, remove quenching stress, forging is made to obtain good comprehensive mechanical property.Tempering temperature
Degree determines, has to consider the actual conditions of heat-treatment furnace, the actual temperature of stove no more than 925 steel lower change point,
Otherwise abnormal phenomena will occur in performance, and the intensity of such as tempered rear forging, hardness raising, plasticity toughness reduce.
After above-mentioned analysis, the best quenching-and-tempering process curve obtained is as shown in Figure 3.
Technical solution 1：A kind of high-strength alloy steel hook forging of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies, quality
Percentage (%)：C 0.13~0.18, Si 0.17~0.37, Mn 0.30~0.60, Cr 0.90~1.20, Mo 0.20~
0.27th, V 0.03~0.08, Ni 2.60~3.00, Cu≤0.25, P≤0.020, S≤0.015, remaining Fe.
Technical solution 2：A kind of system of the high-strength alloy steel hook forging of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies
Make method, it is characterized in that carrying out product three-dimensional modeling using SIEMENS NX UG softwares, product difficult point and error-prone point are carried out
Simulating cutting is verified：(1) forging process：Suspension hook forging weight 27.5t, selects 35t plum blossoms ingot to carry out forging；Initial forging temperature
1250±20℃；800 ± 20 DEG C of final forging temperature；Five fire time completion of forging point；Coupler body part forging ratio 5.5；Bar portion forging ratio
16.8；First fire, chamfered edge is round as a ball after steel ingot is come out of the stove and the fervent mouth of a river, cleaning both ends of the surface, returns stove heat；Second fire, blank dribbling
Face upset plate jumping-up is to 2100mm, and the pulling of heavy reduction flattening side returns stove heat to Ф 1350mm；Third fire, blank dribbling
Upset plate secondary jumping-up in face is to 2100mm, and the pulling of heavy reduction flattening side, to Ф 1450mm, number print, ejection is preforming, and heat
Chop riser, return stove heat；Preforming blank is put into drain cap gathering stock to 1810mm, about 1250mm high, then use by the 4th fire
Drain cap jumping-up, about impression to 2100mm, 920mm high, return stove heat；5th fire clamps bar portion, the band drain cap side of pulling out to process
After it is required that, finishing, alignment molding；(2) heat treatment after forging：It is white point sensitivity due to containing Cr, Ni, Mo, V element in steel alloy
Property steel, so the forging that is swaged into of steel ingot will carry out heat treatment after forging into stove in time；The heat treatment after forging of forging should take normalizing to add
Temper；300 DEG C ± 10 DEG C should be subcooled to after forging process for fuel and keeps the temperature 10 hours, by being fully subcooled, makes forging center portion
Isothermal temperature is cooled to, to improve core structure, then after recrystallizing austenitizing, is subcooled to 300 DEG C of ± 10 DEG C of heat preservations, then add
Heat expands hydrogen to 650 DEG C of ± 10 DEG C of heat preservations；The process advan is in crystal grain thinning uniform formation, and the effect for expanding hydrogen is more preferable；(3) it is final
Heat treatment：A. quenched preceding increase normalizing process：Increase normalizing process before modifier treatment to be necessary, especially for larger cross-section
Forging, it appears even more important, normalizing temperature selection is higher, and soaking time selection is longer, it is therefore an objective to make alloying element abundant
Solid solution and homogenization, can further crystal grain thinning, uniform formation, for modifier treatment perform tissue preparation；B. during quenched quenching
It is fully cooled：Cooling during quenched quenching, water temperature is less than 50 DEG C always during quenching, and forging is made to be fully cooled in water, cools down
Pond will have enough capacity, and simultaneously in quenching process, and the water in pond can carry out big flow cycle, fully supplement cold
Water simultaneously, is intensely stirred with compressed air, forging in water can also upper and lower play, make the heat around forging
Water and bubble Convention diffusion quickly；C. it is tempered in time after quenching, reasonably selects temperature.It should be tempered in time after quenched quenching,
Quenching stress is removed, forging is made to obtain good comprehensive mechanical property；Temperature determines, has to consider heat-treatment furnace
Actual conditions, the actual temperature of stove no more than steel alloy lower change point, otherwise performance abnormal phenomena will occur, such as pass through back
The intensity of forging, hardness raising, plasticity toughness reduce after fire.
The present invention is compared with background technology, first, forging surface quality and ultrasonic examination should meet the requirement of CCS classification societies；
Second is that the low-temperature impact work of the material is effectively improved, Akv2 (- 30 DEG C) >=42J.
Description of the drawings
Fig. 1 is large high-strength alloy steel hook finished product schematic diagram.
Fig. 2 is the specific normalizing of suspension hook forging+tempering process curve synoptic diagram.
Fig. 3 is the specific quenching-and-tempering process curve synoptic diagram of suspension hook forging.
Fig. 4 is the fiery schematic diagram of forging first.
Fig. 5-1 and 5-2 is the fiery schematic diagram of forging second.
Fig. 6-1 and 6-2 is forging third fire schematic diagram.
Fig. 7-1 and 7-2 is the fiery schematic diagram of forging the 4th.
Fig. 8-1 and 8-2 is the fiery schematic diagram of forging the 5th.
Specific embodiment
Embodiment 1：A kind of high-strength alloy steel hook forging of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies, feature
It is mass percent (%)：C 0.13~0.18, Si 0.17~0.37, Mn 0.30~0.60, Cr 0.90~1.20, Mo
0.20~0.27, V 0.03~0.08, Ni 2.60~3.00, Cu≤0.25, P≤0.020, S≤0.015, remaining Fe.
Embodiment 2：On the basis of embodiment 1, add in the amount of the inserting control of Al elements and Al elements 0.020~
0.035%.
Embodiment 3：With reference to attached drawing 1-8.A kind of high strength alloy steel of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies is hung
The production method of hook forging carries out product three-dimensional modeling, to product difficult point and error-prone click-through using SIEMENS NX UG softwares
Row simulating cutting is verified：
(1) forging process：Suspension hook forging weight 27.5t, selects 35t plum blossoms ingot to carry out forging；Initial forging temperature 1250 ±
20℃；800 ± 20 DEG C of final forging temperature；Five fire time completion of forging point；Coupler body part forging ratio 5.5；Bar portion forging ratio 16.8；
First fire, chamfered edge is round as a ball after steel ingot is come out of the stove and the fervent mouth of a river, cleaning both ends of the surface, returns stove heat；
Second fire, blank band spherical surface upset plate jumping-up to 2100mm, and the pulling of heavy reduction flattening side is returned to Ф 1350mm
Stove heat；
Third fire, the blank band secondary jumping-up of spherical surface upset plate to 2100mm, and heavy reduction flattening side is pulled out to Ф
1450mm, number print, ejection is preforming, and heat chops riser, returns stove heat；
Preforming blank is put into drain cap gathering stock to 1810mm, about 1250mm high by the 4th fire, then with drain cap upsetting
Slightly, impression returns stove heat to 2100mm, about 920mm high；
5th fire, clamps bar portion, and with behind the drain cap side of pulling out to process requirement, finishing, alignment are molded；
(2) heat treatment after forging：It is susceptibility of flake formation steel, so steel ingot due to containing Cr, Ni, Mo, V element in steel alloy
The forging being swaged into will carry out heat treatment after forging into stove in time；
The heat treatment after forging of forging should take normalizing to add temper；300 DEG C or so should be subcooled to after forging process for fuel
Heat preservation 10 hours by being fully subcooled, makes forging center portion be cooled to isothermal temperature, to improve core structure, then difficult to understand through recrystallization
After family name's body, 300 DEG C of ± 10 DEG C of heat preservations are subcooled to, 650 DEG C of ± 10 DEG C of heat preservations is heated to and expands hydrogen；The process advan is brilliant in refinement
Grain uniform formation, and the effect for expanding hydrogen is more preferable；
(3) final heat treatment：
A. quenched preceding increase normalizing process
Increase normalizing process before modifier treatment to be necessary, especially for the forging of larger cross-section, it appears it is even more important, just
Fiery temperature selection is higher, and soaking time selection is longer, it is therefore an objective to and alloying element is made fully to be dissolved and homogenize, it can be into one
Crystal grain thinning is walked, uniform formation performs tissue preparation for modifier treatment；
B. it is fully cooled during quenched quenching
Cooling during quenched quenching, water temperature is less than 50 DEG C always during quenching, forging is made to be fully cooled in water, cooling water
Capacity enough Chi Yaoyou, and simultaneously in quenching process, the water in pond can carry out big flow cycle, fully supplement cold water,
Simultaneously, intensely stirred with compressed air, forging in water can also upper and lower play, make hot water around forging and
Bubble Convention diffusion quickly；
C. it is tempered in time after quenching, reasonably selects temperature
It should be tempered in time after quenched quenching, remove quenching stress, forging is made to obtain good comprehensive mechanical property；Tempering temperature
Degree determines, has to consider the actual conditions of heat-treatment furnace, the actual temperature of stove no more than steel alloy lower change point,
Otherwise abnormal phenomena will occur in performance, and the intensity of such as tempered rear forging, hardness raising, plasticity toughness reduce.
Alloy steel hook mechanical property：687~834MPa of tensile strength, yield strength >=461MPa, elongation (%) >=
15%, Akv2 (- 30 DEG C) >=42J.
It is to be understood that：Although above-described embodiment contrasts to the mentality of designing of the present invention, detailed word is retouched
It states, but these word descriptions, only the simple text of mentality of designing of the present invention is described rather than to mentality of designing of the present invention
Limitation, any combination, increase or modification without departing from mentality of designing of the present invention each fallen in protection scope of the present invention.
Claims (5)
1. a kind of high-strength alloy steel hook forging of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies, it is characterized in that quality percentage
Number (%)：C 0.13~0.18, Si 0.17~0.37, Mn 0.30~0.60, Cr 0.90~1.20, Mo 0.20~0.27, V
0.03~0.08, Ni 2.60~3.00, Cu≤0.25, P≤0.020, S≤0.015, remaining Fe.
2. the high-strength alloy steel hook forging of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies according to claim 1,
It is characterized in that：The amount of the inserting control of Al elements and Al elements is added in the ingredient of above-mentioned power 1 0.020~0.035%, optimization
Chemical composition mass percent (%) afterwards：
3. the high-strength alloy steel hook forging of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies according to claim 1,
It is characterized in that alloy steel hook mechanical property：687~834MPa of tensile strength, yield strength >=461MPa, elongation (%) >=
15%, Akv2 (- 30 DEG C) >=42J.
4. the high-strength alloy steel hook forging of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies according to claim 2 is excellent
Change material, it is characterized in that：
5. a kind of production method of the high-strength alloy steel hook forging of the wide 2030mm net weight 7.7t of high 2840mm coupler bodies, feature
It is to carry out product three-dimensional modeling using SIEMENS NX UG softwares, simulating cutting verification is carried out to product difficult point and error-prone point：
(1) forging process：
Suspension hook forging weight 27.5t, selects 35t plum blossoms ingot to carry out forging；1250 ± 20 DEG C of initial forging temperature；Final forging temperature 800
±20℃；Five fire time completion of forging point；Coupler body part forging ratio 5.5；Bar portion forging ratio 16.8；
First fire, chamfered edge is round as a ball after steel ingot is come out of the stove and the fervent mouth of a river, cleaning both ends of the surface, returns stove heat；
Second fire, blank band spherical surface upset plate jumping-up to 2100mm, and the pulling of heavy reduction flattening side is returned stove and is added to Ф 1350mm
Heat；
Third fire, the blank band secondary jumping-up of spherical surface upset plate to 2100mm, and heavy reduction flattening side is pulled out to Ф 1450mm, number
Print, ejection is preforming, and heat chops riser, returns stove heat；
Preforming blank is put into drain cap gathering stock to 1810mm, about 1250mm high by the 4th fire, then with drain cap jumping-up, press
Trace returns stove heat to 2100mm, about 920mm high；
5th fire, clamps bar portion, and with behind the drain cap side of pulling out to process requirement, finishing, alignment are molded；
(2) heat treatment after forging：It is susceptibility of flake formation steel, so steel ingot is swaged into due to containing Cr, Ni, Mo, V element in steel alloy
Forging will in time into stove carry out heat treatment after forging；
The heat treatment after forging of forging should take normalizing to add temper；300 DEG C of ± 10 DEG C of guarantors should be subcooled to after forging process for fuel
Temperature 10 hours by being fully subcooled, makes forging center portion be cooled to isothermal temperature, to improve core structure, then through recrystallizing Ovshinsky
After body, 300 DEG C of ± 10 DEG C of heat preservations are subcooled to, 650 DEG C of ± 10 DEG C of heat preservations is heated to and expands hydrogen；The process advan is in crystal grain thinning
Uniform formation, and the effect for expanding hydrogen is more preferable；
(3) final heat treatment：
A. quenched preceding increase normalizing process
Increase normalizing process before modifier treatment to be necessary, especially for the forging of larger cross-section, it appears even more important, normalizing temperature
Degree selection is higher, and soaking time selection is longer, it is therefore an objective to and alloying element is made fully to be dissolved and homogenize, it can be further thin
Change crystal grain, uniform formation performs tissue preparation for modifier treatment；
B. it is fully cooled during quenched quenching
Cooling during quenched quenching, water temperature is less than 50 DEG C always during quenching, and forging is made to be fully cooled in water, and cooling pond will
There are enough capacity, and simultaneously in quenching process, the water in pond can carry out big flow cycle, cold water fully be supplemented, in this
Meanwhile intensely stirred with compressed air, forging in water can also upper and lower play, make the hot water and bubble around forging
Convention diffusion quickly；
C. it is tempered in time after quenching, reasonably selects temperature
It should be tempered in time after quenched quenching, remove quenching stress, forging is made to obtain good comprehensive mechanical property；Temperature
Determine, have to consider the actual conditions of heat-treatment furnace, the actual temperature of stove no more than steel alloy lower change point, otherwise
Abnormal phenomena will occur in performance, and the intensity of such as tempered rear forging, hardness raising, plasticity toughness reduce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711251082.7A CN108130476B (en) | 2017-12-01 | 2017-12-01 | Large high-strength alloy steel hook forging and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711251082.7A CN108130476B (en) | 2017-12-01 | 2017-12-01 | Large high-strength alloy steel hook forging and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108130476A true CN108130476A (en) | 2018-06-08 |
| CN108130476B CN108130476B (en) | 2019-12-10 |
Family
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112846063A (en) * | 2021-01-05 | 2021-05-28 | 洛阳中重铸锻有限责任公司 | Free forging forming method of large-scale lifting hook forging |
| CN113500157A (en) * | 2021-07-13 | 2021-10-15 | 武钢集团襄阳重型装备材料有限公司 | Manufacturing method of large metallurgy travelling crane double-lifting hook |
| CN113584264A (en) * | 2021-07-29 | 2021-11-02 | 江苏徐工工程机械研究院有限公司 | Low-carbon alloy steel, pin shaft and preparation method thereof |
| CN115740314A (en) * | 2022-11-24 | 2023-03-07 | 南京工程学院 | Anti-cracking and energy-saving forging process for high-strength large-scale forging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115740314A (en) * | 2022-11-24 | 2023-03-07 | 南京工程学院 | Anti-cracking and energy-saving forging process for high-strength large-scale forging |
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| CN108130476B (en) | 2019-12-10 |
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