CN102776337A - Press quenching and processing method for 30 MnCrNiMo armored steel plate part - Google Patents
Press quenching and processing method for 30 MnCrNiMo armored steel plate part Download PDFInfo
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Abstract
The invention discloses a press quenching and processing method of large, medium and small flat plate pieces and bending pieces being subjected to machining operation or not being subjected to machining operation, which are manufactured for 30MnCrNiMo armored steel plate with the medium thickness. The method comprises the steps of conducting the press quenching on a whole annealed armored steel plate delivered into a factory-conducting low-temperature quenching-conducting shot blasting and flattening-blanking a single part or a plurality parts in a combination, directly molding or conducting subsequent molding. According to the method, the quenching deformation of the 30MnCrNiMo armored steel plate part can be controlled effectively, and the quenching quality can be ensured.
Description
Technical field
The present invention relates to heat treating method, the especially press quenching of 30MnCrNiMo armor plating and the working method of 30MnCrNiMo (code name is 685) armor plating.
Background technology
For weight and raising protective capacities and the maneuvering ability that alleviates 4 * 4 infantry fighting vehicles; 4 * 4 infantry fighting vehicles of newly developing; The shellproof part of vehicle body need adopt the high performance homogeneous armor plating manufacturing of the 30MnCrNiMo intermediate gauge more excellent than the armoring performance of 22SiMn2TiB (code name is 616); Under equal armoring performance requriements condition, thickness of slab on average reduces 1～2mm, and these parts need quench treatment; Obtain higher hardness (as reaching 445-514HBW) and intensity (pressure quenches+low-temperaturetempering after tensile strength and ys to reach 1600MPa respectively above with more than the 1100MPa); Adopt different armor plating thickness, can do with the strike of multiple weapon such as common steel core bullet or armour piercing incendiary shell etc., also will guarantee planeness (≤2mm/m
2) and the control hammer trace degree of depth (≤0.5mm/m
2) and the visual appearance requirement of density (can not be too intensive).
The 30MnCrNiMo armor plating is a kind of new armor plating, is not also applied in the production, and its heat treating method also is in the stage of fumbling.The thermal treatment dilivery state of the 30MnCrNiMo armor plating that steel mill dispatches from the factory is an annealed state; Manufacturer need carry out follow-up quench treatment and change internal organizational structure; Handle through low-temperaturetempering again; Obtain tempered martensite+small portion of residual austenite structure, thereby obtain high hardness, intensity and ballistic performance.And the complete processing of the quench part that the middle heavy armor steel plate (like 22SiMn2TiB armor plating) of present domestic tensile strength below 1500MPa made exists quenching back plane degree, bending angle etc. 100% overproof; Need school shape; Correcting value is big, and production efficiency is low, and the part that has also can can't be proofreaied and correct because of quenching strain and scrap; Problems such as while mould consumption is big are not suitable for the processing of 30MnCrNiMo armor plating.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, propose a kind of press quenching and working method of 30MnCrNiMo armor plating part, effectively control the quenching strain of 30MnCrNiMo armor plating part, guarantee the quenching quality.
Technical scheme of the present invention is following:
The present invention be directed to intermediate gauge the manufacturing of 30MnCrNiMo armor plating have or do not have the large, medium and small flat part of machinery processing and the quenching and a processing treatment of bending part; The technological method for processing of all size Shape Parts quenching strain can be effectively controlled in employing, and step comprises: whole anneal armor plating press quenching → low-temperaturetempering → impeller blasting and leveling → single part or a plurality of part combination blanking straight forming or the following process moulding of going into factory.
(1) press quenching: earlier with the heating of quenching of roller bottom type quenching furnance; Arrive shove charge type of heating of temperature behind the armor plating closed assembly of employing single-piece or two same size sizes; 880 ± 10 ℃ of quenching temperatures; Quenching heat tracing time 2～3min/mm, heat tracing rear plating steel plate is come out of the stove with the transfer rate of 0.5m/s, water spray cooling simultaneously after compressing with Quenching press;
(2) low-temperaturetempering: mode one, with the armor plating after the press quenching, adopt the type of heating of car type furnace low-temperature primary shove charge; Do not allow any support during shove charge between armor plating and the armor plating, closed assembly armor plating total thickness≤100mm carries out the low-temperaturetempering heat tracing after the shove charge; 180～240 ℃ of tempering Heating temperatures; Soaking time 3～5min/mm, but must not be less than 5.5 hours, the air cooling of coming out of the stove after the insulation; Or mode two, the armor plating after pressure quenched adopts the repeatedly type of heating of shove charge of car type furnace continuous rolling; Preparatory tempering is heated in shove charge immediately behind every press quenching≤5, and armor plating and armor plating do not allow any support during shove charge, the total thickness≤250mm of closed assembly armor plating; 180～240 ℃ of tempering Heating temperatures, soaking time 3～5min/mm, but must not be less than 4.5 hours; Soaking time is calculated the air cooling of coming out of the stove after the insulation with the soaking time of last shove charge part.
Said car type furnace adopts the resistive band heating, and PID regulates advanced temperature control, all adopts advanced Pneumatic flexible pressed sealing device sealing between chassis and body of heater and between body of heater and fire door; Burner hearth all the other each side except that furnace roof are evenly equipped with resistive band; Furnace roof is provided with strong convection centrifugal high pressure recirculation blower, and burner hearth both sides and furnace roof are provided with flow deflector, makes furnace air convection circulation well; The temperature uniformity of this stove can reach ± and 8 ℃, good heat insulating.
(3) impeller blasting and leveling: after whole anneal armor plating press quenching and the low-temperaturetempering, its surperficial oxide debris is carried out impeller blasting with being uniformly distributed with the through type abrator that is equipped with ramming head up and down; To planeness≤5mm/m
2Directly blanking of armor plating, planeness>=5mm/m
2Armor plating carry out blanking again after adopting 11 roll-type plate straightening roll levelings;
(4) single armoring part or combination blanking of a plurality of armoring part and machine-shaping: with on the armor plating behind press quenching, low-temperaturetempering and the leveling with CUT or laser cutting machine cutting stock; Obtain the armor plating part; According to design of part, moulding such as inserted drill boring, digital controlling plasma flame planer cutting processing, manual CUT cutting processing or laser cutting machine cutting processing are adopted on surfaces such as circular hole, square hole, breach simultaneously; The welding groove face is adopted angle grinding machine polishing machine-shaping; Bending part is used the NC hydraulic press brake bending and molding.
In the inventive method; The processing of armor plating part; Because after having adopted the press quenching of whole annealing armor plating, low-temperaturetempering, impeller blasting and leveling; The technological method for processing of the combination of single part or a plurality of part blanking straight forming or following process moulding has again adopted during the press quenching cooling that Quenching press compresses, water spray cooling and lower surface injection flow rate have guaranteed whole armor plating upper and lower surfaces rapid and uniform cooling and do not had the cooling blind area greater than the type of cooling of upper surface injection flow rate the armor plating upper and lower surfaces comprehensively simultaneously; Reduced the quenching strain of armor plating; Behind low-temperaturetempering, impeller blasting and leveling, blanking or blanking leveling post-treatment form the armor plating part again, can effectively control the quenching strain of the armoring part of all size shape; Avoided the multiple kinds of molds input of press quenching behind the different shapes armor plating forming parts simultaneously, and after unsymmetrical structure part and the bending component moulding during press quenching, because of uneven quench cooled causes bigger quenching unrelieved stress and buckling deformation.Two kinds of shove charge type of heating have been adopted in press quenching and tempering respectively, can guarantee the quenching quality of armor plating part, product is formed produce in enormous quantities.
Therefore, present method can effectively be controlled the quenching strain of 30MnCrNiMo armor plating part, guarantees the quenching quality.
Description of drawings
Fig. 1 is the Quenching press water spray cooling synoptic diagram of press quenching, and 1 is the push-down head water spray chamber among the figure, and 2 is water jet column; 3 is the seaming chuck beading, and 4 is the seaming chuck water jet standpipe, and 5 is the seaming chuck water inlet pipe; 6 is seaming chuck (fixing), and 7 is armor plating, and 8 is Quenching press roller rod; 9 are push-down head (moving up and down), and 10 is the push-down head water inlet pipe.
Fig. 2 is that the thick master of 5mm subtracts the coaming plate part, and radius bend is 4 * R20, and the bending angle is 90 °, the long 619mm in bending bottom surface, and wide 313mm has 2 * φ, 180 machines to add circular hole.
Fig. 3 is a 6mm armor plating folding test part, and radius bend is R20, and the bending angle is 90 °, and the two bending length of sides are respectively 350mm, 300mm, and bending length is 500mm.
Fig. 4 is the thick riser part of the preceding end of 5mm, and radius bend is R30, and the bending angle is 105 °, and 1 bending length of side is 1009mm, and 1 bending is 403mm highly, and has the machine of 2 * φ 80 and 8 * φ 12.5 to add circular hole.
Fig. 5 is the thick first upperdeck part of 5mm, long 2845mm, wide 2054mm.14 circular holes, 6 mechanical workouts such as irregular square hole are arranged.
Fig. 6 is the thick first underdeck part of 6mm, long 2164mm, and wide 1084mm has mechanical workouts such as 6 circular holes, 2 waist shaped holes, 2 irregular square holes and complex configuration.
Fig. 7 is thick back upperdeck of 4mm and back door upper plate component parts, long 2340mm, and wide 1097mm has 27 machines to add circular hole and 1 machine adds square hole etc.11 is the back upperdeck, and 12 is the back door upper plate.
Fig. 8 is the thick side upper plate part of 5mm, long 4072mm, and wide 30MnCrNiMomm has mechanical workouts such as 1 circular hole, 2 square holes, 1 breach and angle.
Embodiment
Below specify the implementation process of the inventive method:
1, press quenching technology:, can adopt the roller bottom type steel plate to press the production line of quenching to realize press quenching for going into factory's annealing armor plating.Earlier with the roller bottom type quenching furnance in the production line to going into factory's armor plating heating of quenching of annealing; Arrive shove charge type of heating of temperature behind the armor plating closed assembly of employing single-piece or two same size sizes; Quenching temperature is got 880 ± 10 ℃; The quenching heat tracing time is got 2～3min/mm, and heat tracing rear plating steel plate is come out of the stove with the transfer rate of 0.5m/s, water spray cooling simultaneously after compressing with Quenching press.
The steel plate that adopts in the above technology presses the production line of quenching to be made up of six parts such as feeding platform, roller bottom type quenching furnance, Quenching press, discharging platform, electrical control system, Hydraulic Stations.Press quenching is accomplished from being fed to quench, but whole process manual operation or automated operation to realize serialization production, are enhanced productivity.
Concrete press quenching production process is: hang on the feeding skid with overhead traveling crane and the complete tongs of the chain type balance beam steel plate level armor plating closed assembly with single-piece or two same size sizes, open preceding fire door, the feeding of material loading bench roller rod fast rotational gets into the roller bottom type quenching furnance; Close preceding fire door after charging puts in place, open the swing at a slow speed of furnace rolls rod front and back, general swing is set to 60S; The even heating workpiece; Open the back fire door behind the heat tracing, the furnace rolls rod converts into and is just producing material fast, and transfer rate is 0.5m/s (adjustable according to envrionment temperature etc.); Quenching press roller rod 8 fast rotational chargings simultaneously; Transfer rate still is 0.5m/s (adjustable according to envrionment temperature etc.), and after the Quenching press charging put in place, seaming chuck was 6 motionless, push-down head 9 rises and compresses armor plating 7; Opening three pump moments then simultaneously forms water jet columns 2 from seaming chuck water inlet pipe 5 and a large amount of tap water of push-down head water inlet pipe 10 outputs, simultaneously to the armor plating cooling of spraying water.Armor plating water spray is cooled to (by water spraying time control) after the room temperature; Push-down head 9 descends; After putting in place, Quenching press roller rod 8 transfers the fast rotational discharging to, the discharging of discharging bench roller rod twirl; Unloading skid roller rod stopped the rotation after discharging put in place, with overhead traveling crane and the complete tongs of chain type balance beam steel plate level etc. steel plate was hung down the discharging platform discharging again.The seaming chuck 6 of Quenching press is beading 3 and water jet standpipe 4 structures, and beading length direction and Quenching press roller rod 8 axis normal compress spacing 120mm; Intermediate arrangement water jet standpipe 4 is furnished with the water spray aperture on the water pipe, the pressure head spacing 240mm of push-down head water spray chamber 1; Both sides and top staggered arrangement water spray aperture; The spiracle both sides water jet direction of last push-down head is staggered, non-blind area when guaranteeing whole steel plate quenching cooling, and the push-down head injection flow rate is greater than seaming chuck simultaneously; Thereby guarantee the cooling of steel plate upper and lower surfaces evenly, effectively control the planeness of steel plate quenching.During normal quenching, the planeness of the roller of Quenching press rod 8, last push-down head should reach 1mm/m.During continuous quenching, water temperature must be controlled at 10～40 ℃ of scopes.Fig. 1 is the water spray cooling synoptic diagram of a kind of Quenching press of selecting for use.
2, low-temperaturetempering technology: have bigger quenching stress according to the 30MnCrNiMo armor plating after product design requirement and the press quenching, need carry out low-temperaturetempering and handle.The present invention proposes to have two kinds of low-temperaturetempering processing schemes:
(1) conventional tempering scheme: the armor plating after the press quenching; Adopt the type of heating of car type furnace low-temperature primary shove charge, do not allow any support during shove charge between armor plating and the armor plating, batch can not be too big; The total thickness of process stipulation closed assembly armor plating is answered≤100mm; Carry out the low-temperaturetempering heat tracing after the shove charge, the tempering Heating temperature is adjusted according to design requirements, and my Company products is got 180～240 ℃.Soaking time is got 3～5min/mm, but soaking time must not be less than 5.5 hours, the air cooling of coming out of the stove after the insulation.
(2) rolling shove charge tempering scheme: the armor plating after the press quenching, adopt the repeatedly type of heating of shove charge of car type furnace continuous rolling, preparatory tempering is heated in shove charge immediately behind every press quenching≤5; Do not allow any support during shove charge between armor plating and the armor plating, the total thickness of closed assembly armor plating can not be too big, and the closed assembly armor plating total thickness of process stipulation is answered≤250mm; The tempering Heating temperature is adjusted according to design requirements; My Company products is got 180～240 ℃, and soaking time is got 3～5min/mm, but soaking time must not be less than 4.5 hours; Soaking time is calculated the air cooling of coming out of the stove after the insulation with the soaking time of last shove charge part.
In the practical implementation, car type furnace adopts the resistive band heating, and PID regulates temperature control; All adopt the sealing of Pneumatic flexible pressed sealing device between chassis and body of heater and between body of heater and fire door, burner hearth all the other each side except that furnace roof are evenly equipped with resistive band, and furnace roof is provided with strong convection centrifugal high pressure recirculation blower; Burner hearth both sides and furnace roof are provided with flow deflector; Make furnace air convection circulation well, like this temperature uniformity can reach ± 8 ℃, good heat insulating.
3, impeller blasting and leveling: after press quenching of monoblock armor plating and the low-temperaturetempering, its surperficial usefulness such as oxide debris is uniformly distributed with the through type abrator that is equipped with ramming head up and down and carries out impeller blasting; To planeness≤5mm/m
2Directly blanking of armor plating, planeness>=5mm/m
2Armor plating just can carry out blanking after adopting 11 roll-type plate straightening roll levelings.The level of automation of above abrator and levelling arm is high, and the production efficiency of impeller blasting and leveling is higher.
4, single armoring part or combination blanking of a plurality of armoring part and machine-shaping: the armor plating part on the armor plating after the press quenching with CUT or laser cutting machine cutting stock; According to design of part, moulding such as inserted drill boring, digital controlling plasma flame planer cutting processing, manual CUT cutting processing or laser cutting machine cutting processing are adopted on surfaces such as circular hole, square hole, breach simultaneously; The welding groove face is adopted angle grinding machine polishing machine-shaping; Bending part is used the NC hydraulic press brake bending and molding.
Below be to adopt above quenching complete processing, the example of specifically following several kinds of parts being processed
:
One, the bending part of angle of bend θ≤90 that the 30MnCrNiMo armor plating of part: t4, t5, t6mm is made ° and radius bend R>=4t (t is an armor plating thickness) such as Fig. 2 and Fig. 3 and t4, t5, t6, the large, medium and small flat part of t8mm such as Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 etc.; Require quench treatment, hardness 445～514HBW.
Two, concrete treating processes:
The press quenching processing parameter of the 30MnCrNiMo armor plating of embodiment 1:t4 and t5mm: adopt two charging modes; To warm shove charge; Quenching temperature is 880 ℃; The soaking time of t4, t5 is respectively 16～24min and 20～30min, and insulation back furnace rolls rod and Quenching press roller rod be all with the transfer rate conveying parts of 0.5m/s, and Quenching press compresses the armor plating cooling of spraying water simultaneously after putting in place; Tempering process parameters: adopt continuous rolling shove charge heating after the press quenching; Charging temperature≤180 ℃ for the first time, the shove charge of press quenching armor plating is tempering in advance once, closed assembly armor plating thickness be 120mm (processing requirement: closed assembly armor plating total thickness should≤250mm); 220 ℃ of tempering Heating temperatures; Soaking time is calculated with the part soaking time of last shove charge, is 270～300 minutes, air cooling.The armor plating specification is (t4 or t5) * 1650 * 7200.
The press quenching processing parameter of the 30MnCrNiMo armor plating of embodiment 2:t6mm: adopt the single-piece charging mode; To warm shove charge; Quenching temperature is 880 ℃; Soaking time 12～18min, insulation back furnace rolls rod and Quenching press roller rod are all carried armor plating with the transfer rate of 0.5m/s, and the back Quenching press that puts in place compresses water spray cooling simultaneously; Tempering process parameters: adopt shove charge heating; Charging temperature≤180 ℃, the thickness of closed assembly armor plating be 96mm (processing requirement: closed assembly armor plating total thickness should≤100mm), 220 ℃ of tempering Heating temperatures; Soaking time is 330～360 minutes, air cooling.The armor plating specification is t6 * 1650 * 7200.
The press quenching processing parameter of the 30MnCrNiMo armor plating of embodiment 3, t8mm: adopt the single-piece charging mode; Quenching temperature is 880 ℃; Soaking time 16～24min; Insulation back furnace rolls rod and Quenching press roller rod are all carried armor plating with the transfer rate of 0.5m/s, and the back Quenching press that puts in place compresses water spray cooling simultaneously; Tempering process parameters: adopt shove charge heating, charging temperature≤180 ℃, closed assembly armor plating thickness be 96mm (processing requirement: closed assembly armor plating total thickness should≤100mm), 220 ℃ of tempering Heating temperatures, soaking time are 330～360 minutes, air cooling.The armor plating specification is t5 * 1800 * 7200.
Finished product to three embodiment detects, and hardness is that 461～514HBW, anti-bullet performance are 2 grades of damages by the GB1496A standard test, has all reached the product design requirement; The difference of hardness of same plate is in 37～53HBW scope, and planeness is 1.0～3.5mm/m
2, metallographic structure is tempered martensite+small portion of residual austenite, has all reached the difference of hardness≤60HBW of same plate, planeness≤5mm/m
2, metallographic structure is the austenitic processing requirement of tempered martensite+small portion of residual.It is above with more than the 1100MPa that tensile strength and ys have reached 1600MPa respectively.Because of quenching strain little, without correcting direct blanking.But press the production line fluctuation of service of quenching, a small amount of spiracle to stop up or the roller rod of Quenching press, the planeness that goes up push-down head surpass 1mm/m etc. if run into, all possibly occur planeness after armor plating press quenching and the low-temperaturetempering and surpass 5mm/m because of corrosion
2, could blanking behind the necessary employing 11 roll-type plate straightening roll levelings.
Claims (5)
1. the press quenching and the working method of a 30MnCrNiMo armor plating part, this method are to the armor plating that has passed through anneal, it is characterized in that, said method comprising the steps of:
(1) press quenching: earlier with the heating of quenching of roller bottom type quenching furnance; Arrive shove charge type of heating of temperature behind the armor plating closed assembly of employing single-piece or two same size sizes; 880 ± 10 ℃ of quenching temperatures; Quenching heat tracing time 2～3min/mm, heat tracing rear plating steel plate is come out of the stove with the transfer rate of 0.5m/s, water spray cooling simultaneously after compressing with Quenching press;
(2) low-temperaturetempering: mode one, with the armor plating after the press quenching, adopt the type of heating of car type furnace low-temperature primary shove charge; Do not allow any support during shove charge between armor plating and the armor plating, the total thickness≤100mm of closed assembly armor plating carries out the low-temperaturetempering heat tracing after the shove charge; 180～240 ℃ of tempering Heating temperatures; Soaking time 3～5min/mm, but must not be less than 5.5 hours, the air cooling of coming out of the stove after the insulation; Or mode two, with the armor plating after the press quenching, adopt the repeatedly type of heating of shove charge of car type furnace continuous rolling; Preparatory tempering is heated in shove charge immediately behind every press quenching≤5; Do not allow any support during shove charge between armor plating and the armor plating, the total thickness≤250mm of closed assembly armor plating, 180～240 ℃ of tempering Heating temperatures; Soaking time 3～5min/mm; But must not be less than 4.5 hours, soaking time is calculated the air cooling of coming out of the stove after the insulation with the soaking time of last shove charge armor plating;
(3) impeller blasting and leveling: after whole anneal armor plating press quenching and the low-temperaturetempering, its surperficial oxide debris is carried out impeller blasting with being uniformly distributed with the through type abrator that is equipped with ramming head up and down; To planeness≤5mm/m
2Directly blanking of armor plating, planeness>=5mm/m
2Armor plating carry out blanking again after adopting 11 roll-type plate straightening roll levelings;
(4) single armoring part or a plurality of armoring part combination blanking and machine-shaping: according to armoring part shape requirement; On the armor plating behind press quenching, low-temperaturetempering and the leveling with CUT or laser cutting machine cutting stock; Simultaneously according to armoring design of part; Boring or machining gap adopt angle grinding machine polishing machine-shaping to the welding groove face; Bending part is used the hydrolic plate bender bending and molding.
2. the press quenching of 30MnCrNiMo armor plating according to claim 1 and working method; It is characterized in that: said step (1) is when spraying water cooling; Employing is to steel plate upper and lower surfaces water spray refrigerative mode simultaneously comprehensively, non-blind area when guaranteeing whole steel plate quenching cooling; And the injection flow rate of steel plate lower surface greater than upper surface, is guaranteed the cooling of steel plate upper and lower surfaces evenly, effectively control the planeness of steel plate quenching.
3. the press quenching of 30MnCrNiMo armor plating according to claim 1 and 2 and working method is characterized in that: the planeness of the last push-down head of said Quenching press is 1mm/m.
4. the press quenching of 30MnCrNiMo armor plating according to claim 3 and working method is characterized in that: said quench water temperature control is 10～40 ℃ of scopes.
5. the press quenching of 30MnCrNiMo armor plating according to claim 4 and working method; It is characterized in that: said car type furnace adopts the resistive band heating; PID regulates temperature control, all adopts the sealing of Pneumatic flexible pressed sealing device between chassis and body of heater and between body of heater and fire door, and burner hearth all the other each side except that furnace roof are evenly equipped with resistive band; Furnace roof is provided with strong convection centrifugal high pressure recirculation blower; Burner hearth both sides and furnace roof are provided with flow deflector, make furnace air convection circulation well, and the temperature uniformity of this stove can reach ± and 8 ℃.
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| CN103233112A (en) * | 2013-04-25 | 2013-08-07 | 北京机电研究所 | Quenching and tempering heat treatment equipment and method for 4-6mm high-strength sheet |
| CN105441660A (en) * | 2016-01-12 | 2016-03-30 | 杭州金舟科技股份有限公司 | Periodic production and stepping heat exchange double-layered U-shaped annealing furnace and control method thereof |
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| CN113850004A (en) * | 2021-10-08 | 2021-12-28 | 重庆赛迪热工环保工程技术有限公司 | Temperature calculation method during steel plate stacking |
| CN114196802A (en) * | 2021-11-29 | 2022-03-18 | 山东钢铁集团日照有限公司 | Heat treatment process suitable for steel plate production |
| CN114921638A (en) * | 2022-05-06 | 2022-08-19 | 北京机电研究所有限公司 | Accurate heat treatment method for low-carbon low-alloy high-strength thin steel plate |
| CN114921638B (en) * | 2022-05-06 | 2023-11-03 | 中国机械总院集团北京机电研究所有限公司 | Accurate heat treatment method for low-carbon low-alloy high-strength thin steel plate |
| WO2023213109A1 (en) * | 2022-05-06 | 2023-11-09 | 中国机械总院集团北京机电研究所有限公司 | Accurate heat treatment method for low-carbon low-alloy high-strength thin steel plate |
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