CN109082588A - A kind of CrMo pole quenched and tempered steel and preparation method thereof - Google Patents

A kind of CrMo pole quenched and tempered steel and preparation method thereof Download PDF

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Publication number
CN109082588A
CN109082588A CN201810938805.9A CN201810938805A CN109082588A CN 109082588 A CN109082588 A CN 109082588A CN 201810938805 A CN201810938805 A CN 201810938805A CN 109082588 A CN109082588 A CN 109082588A
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steel
temperature
furnace
quenched
pole
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CN109082588B (en
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郑桂芸
张佩
欧阳峥容
李金浩
张冠锋
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Shandong Iron and Steel Group Co Ltd SISG
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Shandong Iron and Steel Group Co Ltd SISG
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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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a kind of CrMo pole quenched and tempered steel and preparation method thereof, the chemical component mass percent of the pole quenched and tempered steel is as follows: C:0.38%~0.45%, Si :≤0.40%, Mn:0.60%~0.90%, P :≤0.025%, S:0.020~0.035%, Cr:0.90%~1.20%, Ni :≤0.20%, Mo:0.15%~0.30%, Alt: >=0.020%, H≤2.5 × 10‑4%, T.O≤18 × 10‑4%, surplus are Fe and inevitable impurity.Preparation methods steps are electric furnace smelting, refining furnace smelting, refining furnace smelting, continuous casting, rolling, heat treatment.CrMo pole quenched and tempered steel of the present invention has the characteristics that harden ability, stable mechanical performance, can meet processing and requirement.

Description

A kind of CrMo pole quenched and tempered steel and preparation method thereof
Technical field
The present invention relates to metallurgical technology fields, belong to steel alloy class, are related to a kind of CrMo pole quenched and tempered steel and its preparation side Method.
Background technique
It can be used to produce grinding rod, individual prop, suspending strut rod, oil cylinder, piston rod etc. after round steel is quenched.CrMo pole After quenched, it is widely used in the large and medium-sized the modern designs of plastics of engineering machinery and petroleum deep-well drilling rod and fishing tool, some strength and toughness Tool, directly cuts the parts such as lead screw, the machine tool chief axis of the machining tool used mechanically.
When selecting rod iron heat-treatment production line, need to look at equipment concrete configuration how, whole heat treatment process Whether scheme is able to satisfy specific requirement.Reasonable equipment should be equipped with digital power supply device, various quenching modules, automatic life Produce device etc..
It is reasonably made steel, after continuous casting, steel rolling and hardening and tempering process by formulating rod iron, makes rod iron that there is high tough Cutting free Performance, meet processing requirement.
Summary of the invention
The present invention provides a kind of CrMo pole quenched and tempered steel and preparation method thereof.CrMo pole quenched and tempered steel of the present invention has through hardening The characteristics of property, stable mechanical performance, processing and requirement can be met.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of CrMo pole quenched and tempered steel, chemical component mass percent are as follows:
C:0.38%~0.45%, Si≤0.40%, Mn:0.60%~0.90%, P≤0.025%, S:0.020~ 0.035%, Cr:0.90%~1.20%, Ni :≤0.20%, Mo:0.15%~0.30%, Alt: >=0.020%, H≤2.5 ×10-4%, T.O≤18 × 10-4%, surplus are Fe and inevitable impurity.
, according to the invention it is preferred to, CrMo pole quenched and tempered steel, chemical component mass percent is as follows:
C:0.39%~0.42%, Si 0.20%~0.30%, Mn:0.70%~0.80%, P≤0.020%, S: 0.020~0.030%, Cr:1.00%~1.12%, Ni :≤0.20%, Mo:0.18%~0.20%, Al:0.020%~ 0.035%, H≤2.5 × 10-4%, T.O≤15 × 10-4%, surplus are Fe and inevitable impurity.
The present invention provides the preparation method of above-mentioned CrMo pole quenched and tempered steel, the preparation method is comprised the following steps that
(1) electric furnace smelting
60% or more that quality is dosage is added in molten iron and waste steel ingredient, molten iron；Lime 40 is added in blending process ~45kg/t steel, dolomite 9~12kg/t steel, in fusing early stage spray carbon dust making foamed slag, when aim carbon is lower than 0.10%, by upper Limit is flowed with tapping is added 1.5~2.5kg/t of steel-core-aluminium steel, according to the supplying alloy adjustment of ingredient lower limit, synthesis when ladle alloying Slag dosage 18 ± 2kg/t steel, P≤0.012% when control is tapped, 1620~1660 DEG C of tapping temperature；
(2) refining furnace is smelted
Control basicity of slag 3.0 ± 0.5, slag ingredient CaO 50%~55%, SiO25%~10%, Al2O310%~ 15%, (FeO+MnO≤1.0%), refining process keep white slag；After being sufficiently stirred under white slag, a sample complete analysis is taken, takes one Before secondary sample, 0.5~1.5m/t of aluminum steel steel is fed, according to a sample analysis as a result, by internally controlling requirement adjustment C, Si, Mn, Cr, Mo etc. Component content；Before LF refining furnace tapping, Holo-Al content target is pressed 0.020~0.035% in feeding aluminum steel adjustment control steel 1.0~1.5m/t steel feeds sulphur line, feeds calcium line by 1.0~2.5m/t steel, the white slag retention time is greater than 20min.
(3) VD furnace vacuum refining
Vacuum degree is less than retention time >=14 minute 67Pa, soft argon blowing time >=20 minute after the processing of VD furnace, VD furnace soft blow Upper steel temperature: 1572~1592 DEG C of the first furnace of continuous casting is controlled after argon processing, 1542~1570 DEG C since the second furnace；
(4) continuous casting
800 ± 50mm of pouring basket liquid level, liquid level fluctuation of crystallizer ± 2mm, the tundish degree of superheat press 15~30 DEG C of target controls System, 1537~1547 DEG C of the first furnace temperature of tundish, 1517~1527 DEG C later of the second furnace；Casting speed control 180mm × 220mm base Type is controlled according to 0.95~1.15m/min；260mm × 300mm base type is controlled according to 0.50~0.60m/min, and slab is into straightening Machine temperature >=900 DEG C enter and cheat slow cooling time >=24 hour, cheat temperature≤250 DEG C out；
(5) it rolls
550~850 DEG C of preheating section temperature, 1180~1240 DEG C of bringing-up section temperature, 1180~1220 DEG C of soaking section temperature； The cold base heating time >=2.5h of 180mm × 220mm, hot base heating time >=1.5h, 180mm × 220mm start rolling temperature is 1120 ~1200 DEG C；260mm × 300mm cold base heating time >=3.5h, hot base heating time >=2.5h, start rolling temperature is 1100~ 1180℃；The stocking of Φ >=60mm guarantees 930~1030 DEG C of finishing temperature；The stocking guarantee finishing temperature 950 of Φ < 60mm~ 1050℃。
(6) it is heat-treated
(1) the quenched steel workpiece of CrMo is placed in controllable temperature sub-cooled equipment, there are gaps between workpiece；(2) controllable temperature The medium system of being water-cooled is adopted in sub-cooled equipment, by steel workpiece with the traveling of 1.1m~1.6m/min speed.Maximum heating temperature: 930-940 DEG C, enter water cooling temperature: 820-840 DEG C；(3) enter furnace and carry out high tempering, 600 DEG C of tempering temperature, keep the temperature 120min, furnace cooling are come out of the stove.
, according to the invention it is preferred to, step (1) molten iron and waste steel ingredient, molten iron be added quality be dosage 60%~ 80% or more；40~45kg/t of lime steel, dolomite 9~12kg/t steel, in fusing early stage spray carbon dust are added in blending process Making foamed slag when aim carbon is lower than 0.10%, is flowed with tapping by the upper limit and 2.0~2.5kg/t of steel-core-aluminium steel, ladle alloying is added When according to ingredient lower limit supplying alloy adjustment, control tapping when P≤0.012%, 1620~1660 DEG C of tapping temperature.
, according to the invention it is preferred to, vacuum degree is less than the 67Pa retention time 14~16 minutes in step (3), the processing of VD furnace Soft argon blowing time 15~20 minutes afterwards.
, according to the invention it is preferred to, in step (4), casting speed control: 180mm × 220mm base type is according to 1.10 ± 0.02m/ Min control, 260mm × 300mm base type according to 0.62 ± 0.02m/min control, slab into 920~1000 DEG C of withdrawal straightening machine temperature, Enter to cheat slow cooling time 25~30 hours.
, according to the invention it is preferred to, in step (5), divide specifications control, 180mm × 220mm cold base heating time 2.5h~ 3.5h, hot base heating time 1.5h~2.5h, 180mm × 220mm start rolling temperature are 1120~1200 DEG C；260mm × 300mm is cold Base heating time 3.5h~4.5h, hot base heating time 2.5h~3.5h, start rolling temperature is 1100~1180 DEG C；Φ >=60mm's Stocking guarantees 930~1030 DEG C of finishing temperature；The stocking of Φ < 60mm guarantees 950~1050 DEG C of finishing temperature.
Operation of the present invention is easy, low in cost, three-waste free discharge, and the intensity and plasticity of steel are high, and impact flexibility is high.
Beneficial effects of the present invention are as follows:
1, the addition of element sulphur improves the cutting ability of material；
2., every mechanical property of material ensure that by reasonable Composition Control and production process control；And material Through hardening performance；Service performance requirement after meeting postorder processing.
Detailed description of the invention
Fig. 1 be the embodiment of the present invention 1 made from steel hot-rolled state metallographic structure figure (pearlite+ferrite) 100 ×；
Fig. 2 is steel modifier treatment state metallographic structure figure (tempered sorbite+a small amount of geneva made from the embodiment of the present invention 1 Body) 500 ×.
Specific embodiment
Any feature is disclosed to obtain in this specification, it unless specifically stated, can be equivalent or with similar purpose by other Alternative features are replaced.Unless specifically stated, each feature is an example in a series of equivalent or similar characteristics ?.It is described to understand the present invention just for the sake of help, it should not be considered as to concrete restriction of the invention.
With the drawings and specific embodiments, the present invention is described in further detail below.
Embodiment 1
Embodiment below is for illustrating the present invention, but protection scope of the present invention is not limited to following embodiment.
The technological process of production are as follows: ingredient → electric arc furnace smelting → LF refining furnace refining → VD vacuum refining furnace refining → generous Base continuous casting → semi-tandem rolling mill milling → Tempering and Quenching.
Test produces 4 heats, respectively number 1#, 2#, 3# and 4#.
(1) electric arc furnace smelting
60% or more that quality is dosage is added in molten iron and waste steel ingredient, molten iron；Lime 40 is added in blending process ~45kg/t steel, dolomite 9~12kg/t steel, aim carbon be lower than 0.10% when, by the upper limit with tapping stream addition steel-core-aluminium 1.5~ 2.5kg/t steel, according to the supplying alloy adjustment of ingredient lower limit, synthetic slag dosage 18 ± 2kg/t steel, control tapping when ladle alloying When P≤0.012%, 1620~1660 DEG C of tapping temperature；By heat, the main technological parameter that controls is listed in table 1.
1 electric arc furnace smelting main technologic parameters of table
(2) LF refining furnace is smelted
Control basicity of slag 3.0 ± 0.5, slag ingredient CaO 50%~55%, SiO25%~10%, Al2O310%~ 15%, (FeO+MnO≤1.0%), refining process keep white slag；After being sufficiently stirred under white slag, a sample complete analysis is taken, takes one Before secondary sample, 0.5~1.5m/t of aluminum steel steel is fed, according to a sample analysis as a result, by internally controlling requirement adjustment C, Si, Mn, Cr, Mo etc. Component content；Before LF refining furnace tapping, Holo-Al content target is pressed 0.020~0.035% in feeding aluminum steel adjustment control steel 1.0~1.5m/t steel feeds sulphur line, feeds calcium line by 1.0~2.5m/t steel, the white slag retention time is greater than 20min.Ladle bottom blowing Argon gas stirring, using SiC diffusive deoxidation.Main control technological parameter and finishing slag main component are listed in table 2 and table 3 respectively.
2 LF refining furnace of table smelts main control technological parameter
3 LF refining furnace of table smelts finishing slag main component (mass percent, %)
(3) VD furnace vacuum refining
Vacuum degree is less than retention time >=14 minute 67Pa, soft argon blowing time >=20 minute after the processing of VD furnace, VD furnace soft blow Upper steel temperature: 1572~1592 DEG C of the first furnace of continuous casting is controlled after argon processing, 1542~1570 DEG C since the second furnace；Ladle enters VD Before furnace, 50% or so clinker is removed；After ladle to furnaceman VD position, the main technological parameter that controls is listed in table 4.
4 VD furnace vacuum refining of table mainly controls technological parameter
(4) continuous casting
800 ± 50mm of pouring basket liquid level, liquid level fluctuation of crystallizer ± 2mm, the tundish degree of superheat press 15~30 DEG C of target controls System, 1537~1547 DEG C of the first furnace temperature of tundish, 1517~1527 DEG C later of the second furnace；Casting speed control 180mm × 220mm base Type is controlled according to 0.95~1.15m/min；260mm × 300mm base type is controlled according to 0.50~0.60m/min, and slab is into straightening Machine temperature >=900 DEG C enter and cheat slow cooling time >=24 hour, cheat temperature≤250 DEG C out；
Three machine three of conticaster stream, casting blank specification 260 ㎜ × 300 ㎜.Continuous casting is using the envelope protection of big packet long nozzle argon, tundish Low-carbon coverture and carbonization rice husk is added to keep the temperature, the tundish molten steel liquid level ㎜ of 750 ㎜~800, crystallizer submersed nozzle protection is poured Note mode.Hydraulic non-sine oscillation；Mould liquid level automatically controls；Using M-EMS, parameter 300A/3.0HZ；Two The cold weak cold mode cooling using dynamic control one mist of gas；3 points of slab alignings.Continuous casting control technological parameter is listed in table 5.
5 continuous casting of table controls technological parameter
(5) it rolls
550~850 DEG C of preheating section temperature, 1180~1240 DEG C of bringing-up section temperature, 1180~1220 DEG C of soaking section temperature； The cold base heating time >=2.5h of 180mm × 220mm, hot base heating time >=1.5h, 180mm × 220mm start rolling temperature is 1120 ~1200 DEG C；260mm × 300mm cold base heating time >=3.5h, hot base heating time >=2.5h, start rolling temperature is 1100~ 1180℃；The stocking of Φ >=60mm guarantees 930~1030 DEG C of finishing temperature；The stocking guarantee finishing temperature 950 of Φ < 60mm~ 1050℃；Slab hot sending rolling, is heat-fed 650 DEG C~700 DEG C of casting blank surface temperature, is packed into 500 DEG C of heating furnace casting blank surface temperature ~530 DEG C.Roll control technological parameter is listed in table 6.
6 roll control technological parameter of table
(6) modifier treatment
(1) the quenched steel workpiece of CrMo is placed in controllable temperature sub-cooled equipment, there are gaps between workpiece；(2) controllable temperature The medium system of being water-cooled is adopted in sub-cooled equipment, by steel workpiece with the traveling of 1.1m~1.6m/min speed.Maximum heating temperature: 930-940 DEG C, enter water cooling temperature: 820-840 DEG C；(3) enter furnace and carry out high tempering, 600 DEG C of tempering temperature, keep the temperature 120min, furnace cooling are come out of the stove.930-940 DEG C of mid frequency induction hardening maximum temperature, enters coolant-temperature gage: 820-840 DEG C, travel speed 50HZ can guarantee steel through hardening.High tempering temperature determines 600 DEG C, tempering insulation time 2 hours.
Result data
(1) ingredient
The present embodiment is at being respectively in table 7.
7 ingredient of the embodiment of the present invention of table (mass percent, %)
(2) stocking service check result
The present embodiment low power, micro test and Jominy test are listed in table 8, table 9 and table 10 respectively.
The macroscopic examination of 8 embodiment of the present invention of table
The micro test of 9 embodiment of the present invention of table
The Jominy test of 10 embodiment of the present invention of table
Mechanical property after the entirety of 11 embodiment of the present invention of table is quenched
Steel hot-rolled state metallographic structure figure (pearlite+ferrite) 100 made from the embodiment of the present invention 1 × as shown in Figure 1； Steel modifier treatment state metallographic structure figure made from the embodiment of the present invention 1 (tempered sorbite+a small amount of martensite) 500 × such as Fig. 2 It is shown.
By 8~table of table 11 and FIG. 1 to FIG. 2 it can be seen that CrMo pole quenched and tempered steel macrostructure of the present invention is good, field trash grade The advantages that not low, gas content is low, and crystal grain is tiny, dense structure, and end hardenability significantly improves and stablizes, mechanical property is good.
Technological parameter (such as temperature, time) section bound value of the invention and interval value can realize this law, Embodiment numerous to list herein.
Ordinary skill in the art knowledge can be used in the unspecified content of the present invention.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention Scope of the claims in.

Claims (7)

1. a kind of CrMo pole quenched and tempered steel, which is characterized in that the chemical component mass percent of the pole quenched and tempered steel is as follows:
C:0.38%~0.45%, Si :≤0.40%, Mn:0.60%~0.90%, P :≤0.025%, S:0.020~ 0.035%, Cr:0.90%~1.20%, Ni :≤0.20%, Mo:0.15%~0.30%, Alt: >=0.020%, H≤2.5 ×10-4%, T.O≤18 × 10-4%, surplus are Fe and inevitable impurity.
2. a kind of CrMo pole quenched and tempered steel according to claim 1, which is characterized in that the pole quenched and tempered steel chemistry at Divide mass percent as follows:
C:0.39%~0.42%, Si:0.20%~0.30%, Mn:0.70%~0.80%, P :≤0.020%, S:0.020 ~0.030%, Cr:1.00%~1.12%, Ni :≤0.20%, Mo:0.18%~0.20%, Alt:0.020%~ 0.035%, H≤2.5 × 10-4%, T.O≤15 × 10-4%, surplus are Fe and inevitable impurity.
3. the preparation method of CrMo pole quenched and tempered steel as claimed in claim 1 or 2, the preparation method include the following steps:
1) electric furnace smelting
60% or more that quality is dosage is added in molten iron and waste steel ingredient, molten iron；In blending process be added lime 40~ 45kg/t steel, dolomite 9~12kg/t steel, in fusing early stage spray carbon dust making foamed slag, when aim carbon is lower than 0.10%, with tapping 1.5~2.5kg/t of steel-core-aluminium steel is added in stream, according to the ingredient lower limit supplying alloy adjustment of quenched and tempered steel, synthesis when ladle alloying Slag dosage 18 ± 2kg/t steel, P≤0.012% when control is tapped, 1620~1660 DEG C of tapping temperature；
2) refining furnace is smelted
Control basicity of slag 3.0 ± 0.5, slag ingredient CaO 50%~55%, SiO25%~10%, Al2O310%~15%, FeO+MnO≤1.0%, refining process keep white slag；After being sufficiently stirred under white slag, a sample complete analysis is taken, before taking a sample, 0.5~1.5m/t of aluminum steel steel is fed, according to a sample analysis as a result, adjusting C, Si, Mn, Cr, Mo component content by internally controlling requirement； Before LF refining furnace tapping, Holo-Al content target is 0.020~0.035% in feeding aluminum steel adjustment control steel, by 1.0~1.5m/t Steel feeds sulphur line, feeds calcium line by 1.0~2.5m/t steel, the white slag retention time is greater than 20min；
3) VD furnace vacuum refining
Vacuum degree is less than retention time >=14 minute 67Pa, soft argon blowing time >=20 minute after the processing of VD furnace, at VD furnace soft blow argon The upper steel temperature of control after reason: the first furnace of continuous casting: 1572~1592 DEG C, since the second furnace: 1542~1570 DEG C；
4) continuous casting
800 ± 50mm of pouring basket liquid level, liquid level fluctuation of crystallizer ± 2mm, the tundish degree of superheat press 15~30 DEG C of target controls, in Between wrap 1537~1547 DEG C of the first furnace temperature, 1517~1527 DEG C after the second furnace；Casting speed control: 180mm × 220mm base type is pressed It is controlled according to 0.95~1.15m/min；260mm × 300mm base type is controlled according to 0.50~0.60m/min, and slab is into withdrawal straightening machine temperature >=900 DEG C of degree, enters and cheats slow cooling time >=24 hour, cheats temperature≤250 DEG C out；
5) it rolls
550~850 DEG C of preheating section temperature, 1180~1240 DEG C of bringing-up section temperature, 1180~1220 DEG C of soaking section temperature；180mm The cold base heating time >=2.5h of × 220mm, hot base heating time >=1.5h, 180mm × 220mm start rolling temperature is 1120~1200 ℃；
The cold base heating time >=3.5h of 260mm × 300mm, hot base heating time >=2.5h, start rolling temperature is 1100~1180 DEG C； The stocking of Φ >=60mm guarantees 930~1030 DEG C of finishing temperature；The stocking of Φ < 60mm guarantees 950~1050 DEG C of finishing temperature；
6) it is heat-treated
The quenched steel workpiece of CrMo is placed in controllable temperature sub-cooled equipment, there are gaps between workpiece；Controllable temperature sub-cooled is set The medium system of being water-cooled is adopted in standby, by steel workpiece with the traveling of 1.1m~1.6m/min speed；Maximum heating temperature: 930-940 DEG C, Enter water cooling temperature: 820-840 DEG C；Enter furnace and carry out high tempering, furnace cooling is come out of the stove.
4. the preparation method of CrMo pole quenched and tempered steel according to claim 3, which is characterized in that in step 1), molten iron and useless 60%~80% that quality is dosage is added in steel ingredient, molten iron；In fusing early stage spray carbon dust making foamed slag, aim carbon is lower than When 0.10%, is flowed by the upper limit with tapping and 2.0~2.5kg/t of steel-core-aluminium steel is added.
5. the preparation method of CrMo pole quenched and tempered steel according to claim 3, which is characterized in that in step 3), vacuum degree is small Soft argon blowing time 15~20 minutes after the 67Pa retention time 14~16 minutes, the processing of VD furnace.
6. the preparation method of CrMo pole quenched and tempered steel according to claim 3, which is characterized in that in step 4), casting speed control: 180mm × 220mm base type is controlled according to 1.10 ± 0.02m/min, and 260mm × 300mm base type is controlled according to 0.62 ± 0.02m/min System, slab enter to cheat slow cooling time 25~30 hours into 920~1000 DEG C of withdrawal straightening machine temperature.
7. the preparation method of CrMo pole quenched and tempered steel according to claim 3, which is characterized in that in step 5), 180mm × 220mm cold base heating time 2.5h~3.5h, hot base heating time 1.5h~2.5h；260mm × 300mm cold base heating time 3.5h~4.5h, hot base heating time 2.5h~3.5h.
CN201810938805.9A 2018-08-17 2018-08-17 CrMo round bar quenched and tempered steel and preparation method thereof Active CN109082588B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109913755A (en) * 2019-03-22 2019-06-21 山东钢铁股份有限公司 A kind of peritectic steel and preparation method thereof
CN111363967A (en) * 2020-03-13 2020-07-03 山东钢铁股份有限公司 High-strength and high-toughness CrMo series connecting rod steel and manufacturing method thereof
CN111945056A (en) * 2020-09-03 2020-11-17 大冶特殊钢有限公司 High-sulfur steel and preparation method thereof
CN113564457A (en) * 2021-06-25 2021-10-29 江苏沙钢集团有限公司 Tempered and pre-hardened plastic die steel plate and preparation method thereof
CN114959479A (en) * 2022-05-30 2022-08-30 包头钢铁（集团）有限责任公司 Steel for rare earth wear-resistant alloy steel bar and production method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010222696A (en) * 2009-03-25 2010-10-07 Nisshin Steel Co Ltd Quenched and tempered steel strip, and method for producing the same
CN104372258A (en) * 2014-10-21 2015-02-25 山东钢铁股份有限公司 CrNiMo high-strength pinion steel and preparation method thereof
CN106119706A (en) * 2016-06-27 2016-11-16 舞阳钢铁有限责任公司 Quenching and tempering type adds S easy-cutting die steel plate and production method thereof
CN106521324A (en) * 2016-12-08 2017-03-22 山东钢铁股份有限公司 Steel for wind power intermediate shaft gear carburization and preparation method thereof
CN107177804A (en) * 2017-04-07 2017-09-19 江阴兴澄特种钢铁有限公司 A kind of high tough quenched round steel of Cutting free and its manufacture method
CN107746910A (en) * 2017-11-12 2018-03-02 湖南华菱湘潭钢铁有限公司 A kind of production method of CrNiMo alloys round steel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010222696A (en) * 2009-03-25 2010-10-07 Nisshin Steel Co Ltd Quenched and tempered steel strip, and method for producing the same
CN104372258A (en) * 2014-10-21 2015-02-25 山东钢铁股份有限公司 CrNiMo high-strength pinion steel and preparation method thereof
CN106119706A (en) * 2016-06-27 2016-11-16 舞阳钢铁有限责任公司 Quenching and tempering type adds S easy-cutting die steel plate and production method thereof
CN106521324A (en) * 2016-12-08 2017-03-22 山东钢铁股份有限公司 Steel for wind power intermediate shaft gear carburization and preparation method thereof
CN107177804A (en) * 2017-04-07 2017-09-19 江阴兴澄特种钢铁有限公司 A kind of high tough quenched round steel of Cutting free and its manufacture method
CN107746910A (en) * 2017-11-12 2018-03-02 湖南华菱湘潭钢铁有限公司 A kind of production method of CrNiMo alloys round steel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109913755A (en) * 2019-03-22 2019-06-21 山东钢铁股份有限公司 A kind of peritectic steel and preparation method thereof
CN111363967A (en) * 2020-03-13 2020-07-03 山东钢铁股份有限公司 High-strength and high-toughness CrMo series connecting rod steel and manufacturing method thereof
CN111945056A (en) * 2020-09-03 2020-11-17 大冶特殊钢有限公司 High-sulfur steel and preparation method thereof
CN113564457A (en) * 2021-06-25 2021-10-29 江苏沙钢集团有限公司 Tempered and pre-hardened plastic die steel plate and preparation method thereof
CN114959479A (en) * 2022-05-30 2022-08-30 包头钢铁（集团）有限责任公司 Steel for rare earth wear-resistant alloy steel bar and production method thereof
CN114959479B (en) * 2022-05-30 2023-08-25 包头钢铁（集团）有限责任公司 Steel for rare earth wear-resistant alloy steel bar and production method thereof

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