CN108660302A - A kind of production control method of large scale seabed forging - Google Patents
A kind of production control method of large scale seabed forging Download PDFInfo
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- CN108660302A CN108660302A CN201810475619.6A CN201810475619A CN108660302A CN 108660302 A CN108660302 A CN 108660302A CN 201810475619 A CN201810475619 A CN 201810475619A CN 108660302 A CN108660302 A CN 108660302A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- 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
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Forging (AREA)
Abstract
The present invention relates to seabed forging production technical field, specially a kind of production control method of large scale seabed forging includes the following steps：Step 1：Choose blank；Step 2：Pretreatment；Step 3：Stress relief annealing；Step 4：Normalizing；Step 5：Quenching；Step 6：Steadyization；Step 7：Tempering, the beneficial effects of the invention are as follows：Process implementing after the present invention optimizes, in the centre of wall thickness, room-temperature yield strength and 100 DEG C of high temperature lower yield strengths are significantly increased, meet ferrite in project demand tissue obviously to refine, strip or acicular ferrite are become from granular ferrite, pearlite is uniformly distributed, and upper bainite disappears substantially, tissue intensity has clear improvement, and big each position of wall thickness forging disclosure satisfy that deep-sea performance requirement.
Description
Technical field
The present invention relates to seabed forging production technical field, specially a kind of production controlling party of large scale seabed forging
Method.
Background technology
The Global Oil energy is increasingly in short supply, and land, shallow sea oil gas field resource are fewer and fewer, and petrol resources exploitation turns to exploitation
The deepwater field of difficulty bigger, and deepwater field high pressure, high temperature, bad environments require pole to associated materials and parts
It is harsh, once and equipment installation it is underwater, repair relatively difficult and somewhat expensive.
Deep-sea project underwater facility, it is desirable that material is that A694 F65 not only need to meet DNV-OS-F101 and ISO
The requirement of 15590-3 standards, it is also desirable to have high intensity and good toughness, more requires good corrosion resistance, weldability；Size is big
And wall thickness is more than 100mm, temperature requires to be not less than 540 DEG C.Conventional A694 F65 forging materials can no longer meet item
Mesh requirement.
Invention content
The purpose of the present invention is to provide a kind of production control methods of large scale seabed forging, to solve under the prior art
The problem of seabed forging corrosion resistance, weldability, toughness and intensity bad control.
To achieve the above object, the present invention provides the following technical solutions：A kind of production controlling party of large scale seabed forging
Method includes the following steps：
Step 1：Choose blank：Wall thickness is chosen in 100-150mm and the low high strength alloy steel of alloying element content
(A694 F65) blank；
Step 2：Pretreatment：The riser of high-strength alloy steel blank and the mouth of a river in excision step one, riser and the mouth of a river it is total
Resection is between 5-15%；
Step 3：Stress relief annealing：By step 2, treated that blank is placed in heating furnace heats, and control temperature exists
It 150-200 DEG C, is taken out after keeping the temperature 2-3 hour, is placed under spacious environment and is cooled to room temperature and is homogenized processing, at homogenizing
Reason includes the processing of high temperature homogenizing and the processing of low temperature homogenizing；
Step 4：Normalizing：By step 3, treated that blank is placed in vacuum furnace, by heating in vacuum stove evacuation
After heat, the first heating temperature that adjusts keeps the temperature 2-2.5 hours, then with the tune of (10-15 DEG C)/min between 100-200 DEG C
Perfect square formula adjusts upward temperature, when temperature is adjusted to 200/300/400/500/600/700/800/900/1000/1100/1200
When, 1.5-2 hours persistently are kept the temperature, until adjusting temperature to after 900-1200 DEG C, keeps the temperature 45-75 minutes, jumping-up is carried out and pulls out
Long, forging ratio is between 4-6；
Step 5：Quenching：Forging made from step 4 is placed in vacuum quencher, vacuum hardening stove evacuation
Afterwards, the temperature in vacuum quencher is heated to 600-800 DEG C with the heating speed of (10-15 DEG C)/min, keeps the temperature 15-30 minutes
Afterwards, 900-1100 austenitizings are then warming up to the speed of (10-15 DEG C)/min, austenitizing holding time is 45-75 points
Clock, air quenching is carried out after the completion of heat preservation to forging, and air quenching pressure is 3 ± 0.2Pa；
Step 6：Steadyization：Forging after austenitizing in step 5 is placed under room temperature environment 20-25 hours cooling；
Step 7：Tempering：Forging after cooling in step 6 is placed in tempering furnace, by the temperature (5- in tempering furnace
12 DEG C) adjustment mode of/min adjusts upward temperature, when often rising 40-54 DEG C, keep the temperature 10-20 minutes, when temperature rises to 540 ±
After 50 DEG C, in-furnace temperature is kept 2-3 hours, stop heat preservation, and be cooled to room temperature with furnace temperature reduction, so far, the forging
Part completes.
Preferably, after being vacuumized in vacuum furnace in the step 4, heating speed is added with the speed of 10 DEG C/min
Heat is to 930 DEG C.
Preferably, after being vacuumized in vacuum quencher in the step 5, heating speed is added with the speed of 10 DEG C/min
Heat is to 930 DEG C.
Preferably, the temperature in the step 7 in tempering furnace is heated to 540 DEG C with the speed of 10 DEG C/min.
Preferably, for the temperature of the step 3 high temperature homogenizing processing at 450-500 DEG C, soaking time is 3.5-4 hours.
Preferably, the temperature of low temperature homogenizing processing keeps the temperature 3-3.5 hours at 200-250 DEG C in the step 3.
Compared with prior art, the beneficial effects of the invention are as follows：Process implementing after the present invention optimizes, in wall thickness
Centre, room-temperature yield strength and 100 DEG C of high temperature lower yield strengths are significantly increased, and meet iron element in project demand tissue
Body obviously refines, and becomes strip or acicular ferrite from granular ferrite, and pearlite is uniformly distributed, and upper bainite disappears substantially,
Tissue intensity has clear improvement, and big each position of wall thickness forging disclosure satisfy that deep-sea performance requirement.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality
It is only a part of the embodiment of the present invention to apply example, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
The every other embodiment that logical technical staff is obtained without making creative work belongs to what the present invention protected
Range.
Embodiment one
The present invention provides a kind of technical solution：A kind of production control method of large scale seabed forging, includes the following steps：
Step 1：Choose blank：Wall thickness is chosen in 136mm and the low high strength alloy steel (A694 of alloying element content
F65) blank；
Step 2：Pretreatment：The riser of high-strength alloy steel blank and the mouth of a river in excision step one, riser and the mouth of a river it is total
Resection is 10%；
Step 3：Stress relief annealing：By step 2, treated that blank is placed in heating furnace heats, and control temperature exists
It 180 DEG C, is taken out after keeping the temperature 2 hours, is placed under spacious environment and is cooled to room temperature and is homogenized processing, homogenizing processing includes
The processing of high temperature homogenizing and the processing of low temperature homogenizing；
Step 4：Normalizing：By step 3, treated that blank is placed in vacuum furnace, by heating in vacuum stove evacuation
After heat, the first heating temperature that adjusts keeps the temperature 2 hours, then adjusts upward temperature with the adjustment mode of 10/min at 150 DEG C,
When temperature is adjusted to 200/300/400/500/600/700/800/900,1.5 hours persistently are kept the temperature, until temperature is adjusted
To after 930 DEG C, 70 minutes are kept the temperature, carries out jumping-up and pulling, forging ratio is 4.5；
Step 5：Quenching：Forging made from step 4 is placed in vacuum quencher, vacuum hardening stove evacuation
Afterwards, the temperature in vacuum quencher is heated to 930 DEG C with the heating speed of 10/min, kept the temperature after twenty minutes, then with 15/
The speed of min is warming up to 930 DEG C of austenitizings, and austenitizing holding time is 50 minutes, to forging into promoting the circulation of qi after the completion of heat preservation
It quenches, air quenching pressure is 3Pa；
Step 6：Steadyization：Forging after austenitizing in step 5 is placed under room temperature environment 23 hours cooling；
Step 7：Tempering：Forging after cooling in step 6 is placed in tempering furnace, by the temperature 10 in tempering furnace
DEG C/adjustment mode of min adjusts upward temperature, when often rising 40 DEG C, 10 minutes are kept the temperature, after temperature rises to 540 DEG C, keeps stove
Interior temperature 2.5 hours stops heat preservation, and is cooled to room temperature with furnace temperature reduction, and so far, which completes.
Wherein, for the temperature of the step 3 high temperature homogenizing processing at 470 DEG C, soaking time is 3.5 hours.The step
The temperature of low temperature homogenizing processing keeps the temperature 3 hours at 220 DEG C in three.
Embodiment two
A kind of production control method of large scale seabed forging, includes the following steps：
Step 1：Choose blank：Wall thickness is chosen in 140mm and the low high strength alloy steel (A694 of alloying element content
F65) blank；
Step 2：Pretreatment：The riser of high-strength alloy steel blank and the mouth of a river in excision step one, riser and the mouth of a river it is total
Resection is between 7%；
Step 3：Stress relief annealing：By step 2, treated that blank is placed in heating furnace heats, and control temperature exists
It 170 DEG C, is taken out after keeping the temperature 2 hours, is placed under spacious environment and is cooled to room temperature and is homogenized processing, homogenizing processing includes
The processing of high temperature homogenizing and the processing of low temperature homogenizing；
Step 4：Normalizing：By step 3, treated that blank is placed in vacuum furnace, by heating in vacuum stove evacuation
After heat, the first heating temperature that adjusts keeps the temperature 2.2 hours, then adjusts upward temperature with the adjustment mode of 10 DEG C/min at 160 DEG C
Degree persistently keeps the temperature 1.8 hours when temperature is adjusted to 200/300/400/500/600/700/800/900, until by temperature tune
After whole to 950 DEG C, 55 minutes are kept the temperature, carries out jumping-up and pulling, forging ratio is 4.6；
Step 5：Quenching：Forging made from step 4 is placed in vacuum quencher, vacuum hardening stove evacuation
Afterwards, the temperature in vacuum quencher is heated to 650 DEG C with the heating speed of 10 DEG C/min, after keeping the temperature 25 minutes, then with 10
DEG C/speed of min is warming up to 1000 DEG C of austenitizings, austenitizing holding time is 60 minutes, after the completion of heat preservation to forging into
Promoting the circulation of qi is quenched, and air quenching pressure is 3.2Pa；
Step 6：Steadyization：Forging after austenitizing in step 5 is placed under room temperature environment 22 hours cooling；
Step 7：Tempering：Forging after cooling in step 6 is placed in tempering furnace, by the temperature 11 in tempering furnace
DEG C/adjustment mode of min adjusts upward temperature, when often rising 44 DEG C, 20 minutes are kept the temperature, after temperature rises to 550 DEG C, keeps stove
Interior temperature 2.1 hours stops heat preservation, and is cooled to room temperature with furnace temperature reduction, and so far, which completes.
Wherein, for the temperature of the step 3 high temperature homogenizing processing at 470 DEG C, soaking time is 3.6 hours.The step
The temperature of low temperature homogenizing processing keeps the temperature 3.2 hours at 240 DEG C in three.
Embodiment three
A kind of production control method of large scale seabed forging, includes the following steps：
Step 1：Choose blank：Wall thickness is chosen in 170mm and the low high strength alloy steel (A694 of alloying element content
F65) blank；
Step 2：Pretreatment：The riser of high-strength alloy steel blank and the mouth of a river in excision step one, riser and the mouth of a river it is total
Resection is between 8%；
Step 3：Stress relief annealing：By step 2, treated that blank is placed in heating furnace heats, and control temperature exists
It 175 DEG C, is taken out after keeping the temperature 2.3 hours, is placed under spacious environment and is cooled to room temperature and is homogenized processing, homogenizing processing packet
Include the processing of high temperature homogenizing and the processing of low temperature homogenizing；
Step 4：Normalizing：By step 3, treated that blank is placed in vacuum furnace, by heating in vacuum stove evacuation
After heat, the first heating temperature that adjusts keeps the temperature 2 hours, then adjusts upward temperature with the adjustment mode of 10 DEG C/min at 150 DEG C
Degree persistently keeps the temperature 1.5 hours when temperature is adjusted to 200/300/400/500/600/700/800/900, until by temperature tune
After whole to 970 DEG C, 45 minutes are kept the temperature, carries out jumping-up and pulling, forging ratio is 4.7；
Step 5：Quenching：Forging made from step 4 is placed in vacuum quencher, vacuum hardening stove evacuation
Afterwards, the temperature in vacuum quencher is heated to 700 DEG C with the heating speed of 10 DEG C/min, after keeping the temperature 15 minutes, then with 10
DEG C/speed of min is warming up to 930 DEG C of austenitizings, austenitizing holding time is 65 minutes, is carried out to forging after the completion of heat preservation
Air quenching, air quenching pressure are 3Pa；
Step 6：Steadyization：Forging after austenitizing in step 5 is placed under room temperature environment 25 hours cooling；
Step 7：Tempering：Forging after cooling in step 6 is placed in tempering furnace, by 8 DEG C of temperature in tempering furnace/
The adjustment mode of min adjusts upward temperature, when often rising 42 DEG C, keeps the temperature 17 minutes, after temperature rises to 530 DEG C, keeps in stove
Temperature 2 hours stops heat preservation, and is cooled to room temperature with furnace temperature reduction, and so far, which completes.
Wherein, for the temperature of the step 3 high temperature homogenizing processing at 500 DEG C, soaking time is 3.5 hours.The step
The temperature of low temperature homogenizing processing keeps the temperature 3 hours at 250 DEG C in three.
The obtained forging of above-mentioned three groups of embodiments is than the forging under the prior art, corrosion resistance, weldability, toughness and strong
Degree is significantly improved, wherein first group of obtained forging performance of embodiment is higher compared to other two groups of performances, wherein the
The material prescription such as following table that one group of embodiment is taken：
Table 1the chemical composition (%) of A694 F65
By the process implementing that first group of embodiment optimizes, in the centre of wall thickness, room-temperature yield strength reaches
495MPa, 100 DEG C of high temperature lower yield strengths also reach 456MPa, meet project demand；It is tempered at 540 DEG C simultaneously, in tissue
Ferrite obviously refines, and becomes strip or acicular ferrite from granular ferrite, pearlite is uniformly distributed, and upper bainite disappears substantially
It loses, such tissue has clear improvement to intensity.
The innovation of the invention consists in that the alloying element used requires content low, and the optimization design from component content, forging
Than control >=4: 1, optimization of Heat Treatment Process, it is ensured that large scale, big wall thickness forging are heated evenly, and each position performance satisfaction is wanted
It asks.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of production control method of large scale seabed forging, which is characterized in that include the following steps：
Step 1：Choose blank：Wall thickness is chosen in 100-150mm and the low high strength alloy steel of alloying element content（A694
F65）Blank；
Step 2：Pretreatment：Total excision at the riser of high-strength alloy steel blank and the mouth of a river in excision step one, riser and the mouth of a river
Amount is between 5-15%；
Step 3：Stress relief annealing：By step 2, treated that blank is placed in heating furnace heats, and control temperature is in 150-
It 200 DEG C, is taken out after keeping the temperature 2-3 hour, is placed under spacious environment and is cooled to room temperature and is homogenized processing, homogenizing processing packet
Include the processing of high temperature homogenizing and the processing of low temperature homogenizing；
Step 4：Normalizing：By step 3, treated that blank is placed in vacuum furnace, will after heating in vacuum stove evacuation plus
Heat, the first heating temperature that adjusts keep the temperature 2-2.5 hours between 100-200 DEG C, then with（10-15℃）The adjustment side of/min
Formula adjusts upward temperature, when temperature is adjusted to 200/300/400/500/600/700/800/900/1000/1100/1200,
1.5-2 hours persistently are kept the temperature, until adjusting temperature to after 900-1200 DEG C, 45-75 minutes is kept the temperature, carries out jumping-up and pulling,
Forging ratio is between 4-6；
Step 5：Quenching：Forging made from step 4 is placed in vacuum quencher, it, will after vacuum hardening stove evacuation
Temperature in vacuum quencher with（10-15℃）The heating speed of/min is heated to 600-800 DEG C, after keeping the temperature 15-30 minutes, so
Afterwards with（10-15℃）The speed of/min is warming up to 900-1100 austenitizings, and austenitizing holding time is 45-75 minutes, is protected
Air quenching is carried out to forging after the completion of temperature, air quenching pressure is 3 ± 0.2Pa；
Step 6：Steadyization：Forging after austenitizing in step 5 is placed under room temperature environment 20-25 hours cooling；
Step 7：Tempering：Forging after cooling in step 6 is placed in tempering furnace, by the temperature in tempering furnace（5-12
℃）The adjustment mode of/min adjusts upward temperature, when often rising 40-54 DEG C, 10-20 minutes is kept the temperature, when temperature rises to 540 ± 50
After DEG C, in-furnace temperature is kept 2-3 hours, stop heat preservation, and be cooled to room temperature with furnace temperature reduction, so far, the forging
It completes.
2. a kind of production control method of large scale seabed forging according to claim 1, it is characterised in that：The step
After being vacuumized in vacuum furnace in four, heating speed is heated to 930 DEG C with the speed of 10 DEG C/min.
3. a kind of production control method of large scale seabed forging according to claim 1, it is characterised in that：The step
After being vacuumized in vacuum quencher in five, heating speed is heated to 930 DEG C with the speed of 10 DEG C/min.
4. a kind of production control method of large scale seabed forging according to claim 1, it is characterised in that：The step
Temperature in seven in tempering furnace is heated to 540 DEG C with the speed of 10 DEG C/min.
5. a kind of production control method of large scale seabed forging according to claim 1, it is characterised in that：The step
For the temperature of three high temperatures homogenizing processing at 450-500 DEG C, soaking time is 3.5-4 hours.
6. a kind of production control method of large scale seabed forging according to claim 1, it is characterised in that：The step
The temperature of low temperature homogenizing processing keeps the temperature 3-3.5 hours at 200-250 DEG C in three.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112251572A (en) * | 2020-08-31 | 2021-01-22 | 伊莱特能源装备股份有限公司 | Manufacturing method of high-performance wind driven generator bearing retainer forging |
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| CN106222576A (en) * | 2016-08-30 | 2016-12-14 | 宝鼎科技股份有限公司 | A kind of large-scale high powered ship propeller shaft bracket steel-casting of integral casting forming |
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| CN103691860A (en) * | 2013-12-06 | 2014-04-02 | 天津重型装备工程研究有限公司 | Machining method for effectively improving quality of large forging |
| CN106222576A (en) * | 2016-08-30 | 2016-12-14 | 宝鼎科技股份有限公司 | A kind of large-scale high powered ship propeller shaft bracket steel-casting of integral casting forming |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112251572A (en) * | 2020-08-31 | 2021-01-22 | 伊莱特能源装备股份有限公司 | Manufacturing method of high-performance wind driven generator bearing retainer forging |
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