CN104212955B - Reduce carbide liquid-extraction level method for distinguishing in high-carbon-chromium bearing steel - Google Patents

Reduce carbide liquid-extraction level method for distinguishing in high-carbon-chromium bearing steel Download PDF

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CN104212955B
CN104212955B CN201410439803.7A CN201410439803A CN104212955B CN 104212955 B CN104212955 B CN 104212955B CN 201410439803 A CN201410439803 A CN 201410439803A CN 104212955 B CN104212955 B CN 104212955B
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angle
heating
time
scopes
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CN104212955A (en
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陈庆丰
许竹桃
杜方
陈华强
余爱华
孙晶
李献忠
汪菊华
黄海玲
张青山
张贤忠
张渊普
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Baowu group Echeng Iron and Steel Co., Ltd
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Wuhan Iron and Steel Group Corp
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Abstract

The invention discloses and a kind of reduce carbide liquid-extraction level method for distinguishing in high chromium bearing steel, the method comprises the steps: 1) when smelting, control the Steel Melt for Continuous Casting degree of superheat 10~25 DEG C of scopes;2) continuous casting steel billet that heating obtains after smelting, controls bringing-up section temperature and soaking zone temperature;3) heat time heating time is controlled according to the cross dimensions of continuous casting steel billet;4) utilizing adjustable plate in nozzle, burn in the commutation cycle at heating furnace, control heating furnace flame in the following manner and spray into angle: burning time, flame sprays into even angle and adjusts to n ° from m °, during commutation, adjustable plate in nozzle is recalled to original place;Described m=9~11, described n=14~18.Compared with prior art, heating furnace burner noz(zle) only need to be added an adjustable plate by the present invention, the air-flow angle making burning has slight adjustment, Important Adjustment is made without reforming equipment with to technique, namely can ensure that the strand homogeneous temperature of heating in stove, thus reaching to control or reduce carbide liquid-extraction rank in bearing steel.

Description

Reduce carbide liquid-extraction level method for distinguishing in high-carbon-chromium bearing steel
Technical field
The present invention relates to the production method of a kind of high-carbon-chromium bearing steel, reduce carbide liquid-extraction level method for distinguishing in high-carbon-chromium bearing steel particularly to one, belong to iron and steel processing technique field.
Background technology
(in standard, regulation high-carbon-chromium bearing steel has high-carbon-chromium bearing steel: GCr4, GCr15, GCr15SiMn, GCr15SiMo, 5 grades of steel such as GCr18Mo, wherein with GCr15 for representative) it is primarily used for manufacturing the material of bearing roller, the tissue of high-carbon-chromium bearing steel is the carbide being dispersed with surplus on martensitic matrix, this is because carbon content is high in high-carbon-chromium bearing steel, and possibly together with a certain amount of chromium, strand has substantial amounts of eutectic carbide, these carbides are when heating steel billet, major part melt back is in austenite, but there is a small amount of carbide not melt, and molten part precipitates out when rolling or during roller repairing again, form carbide liquid-extraction, carbide strip, carbide network tissue.Bearing in use, can reduce its wearability because being in the peeling of the carbide of epidermis;Carbide particle because being in inside strengthens crack sensitivity, the generation of fatigue crack extends and reduces fatigue life.
It is generally acknowledged that carbide liquid-extraction is carbon and alloying element enrichment and the metastable eutectic ledeburite that produces, be fractured into during hot-working irregular broken soon, be chain along rolling direction or strip be distributed.High-carbon-chromium bearing steel strand is when heating, ferritic transformation is after austenite, former carbide position carbon atom concn is higher, therefore carbide starts melt back in austenite, reorganize realization mainly by interstitial carbon therein to the self-diffusion of austenite diffusion and iron atom generation and the crystal lattice of carbide itself.
In actual production, GCr15 steel billet is by heating, roll and cooling, though carbide rank can be reduced, but is difficult to eliminate carbide in steel.Regulation in mark " high-carbon-chromium bearing steel " GB/T18254-2002 of native land: bearing steel carbide liquid-extraction is according to material different shape, delivery condition of heat treatment, dimensions requirement, liquation≤0.5~2.5 grade.
Additionally, due to heating furnace flame ignition temperature inhomogeneities, even if present many oven inner liners are mounted with heat accumulation plate, heating in-furnace temperature can be made uniform to some extent, but steel billet each spot temperature fluctuation is still very big, thus causing the inhomogeneities of carbide liquid-extraction in GCr15 steel billet.Because carbide liquid-extraction inspection is random, in order to ensure steel liquation qualification rate, only it is improved billet heating temperature, time, makes carbide uniformly lose.
By controlling in bearing steel, carbide liquid-extraction is to improve the patent of the performance of high-carbon-chromium bearing steel, article a lot, and method is different, concludes, is mainly: 1. reduces superheat of liquid steel during continuous casting, and quickly cools down when steel billet solidifies, makes primary crystallization carbide tiny;2. at high temperature long-time heating, is made crystalloid carbide dissolution austenite in strand, and is diffused by C element concentration difference, reach supersaturation C atom and be uniformly distributed in austenite, thus eliminating or reducing carbide liquid-extraction.But these methods had both wasted the energy, increase again the production time, reduce productivity ratio, also can result in bearing steel billet simultaneously and produce micro-crack, inevitably to increase in steel production process cost, operation, time of delivery.
Such as, patent " heating means of a kind of continuous-casting bearing steel bloom " (ZL200710202792.6) mainly controls the heating means of bloom, each temperature, the period such as including preheating section, bringing-up section and soaking zone, carbide liquid-extraction in steel is not controlled.Patent " a kind of method of producing high-carbon chromium bearing steel by double retarded cooling process " (ZL200810227811.3) is by continuous casting billet slow cooling, stocking slow cooling, discharge the hydrogen content in strand, round steel and stress, it is ensured that stocking low multiple quality exists without Light spots crack defect.Patent " a kind of bearing ball annealing process of thermal treatment method " (ZL201210075317.4) then relates to a kind of rolling rear bearing steel ball annealing heat-treatment technology method.Patent " method reducing net level of bearing steel wire rod carbide " (ZL200910062664.8) is although being control bearing steel carbide, but it is by rate of cooling before and after controlled rolling, reduces the method for net carbide in steel.
Article " research of GCr15 steel carbide liquid-extraction and heating process relation " describes the carbide liquid-extraction of GCr15 bearing steel and heating-up temperature, relation between heat time heating time, although carbide liquid-extraction rank in steel can be controlled or reduce, but need to improve temperature, extend heat time heating time, economically lose.Article " bearing steel carbide liquid-extraction defects controlling craft discussion " is then by taking control heating-up temperature, control blank dress, speed of coming out of the stove, control stable furnace condition, adopt the technological measures such as Process of Hot Transfering And Hot Charging, effectively prevent and control the generation of bearing steel carbide liquid-extraction defect.The article technical measures of carbide eliquation rank " reduce " is then for rolling different size round steel, adjusts preheating section, bringing-up section temperature and heat time heating time, makes in steel billet carbide diffusion time more than Theoretical Calculation required time, thus reducing carbide liquid-extraction.It is then employing electromagnetic agitation that article " improves the technical study of bearing steel carbide inhomogeneities ", slow down setting rate, low-temperature heat steel billet, roll the measures such as rear twice pressure cooling, spheroidizing, improves bearing steel net carbide.
Summary of the invention
It is an object of the invention to provide carbide liquid-extraction level method for distinguishing in the high chromium bearing steel of a kind of reduction, the method by control continuous casting time molten steel the degree of superheat and when strand heat adjustment heating furnace flame spray into angle, make whole piece steel billet temperature uniform, guarantee carbide liquid-extraction uniformity consistency, thus reducing carbide liquid-extraction rank.
For achieving the above object, the method for the present invention comprises the steps:
1) when smelting, the Steel Melt for Continuous Casting degree of superheat is controlled 10~25 DEG C of scopes;
2) continuous casting steel billet that heating obtains after smelting, bringing-up section temperature controls 1100~1220 DEG C of scopes, and soaking zone temperature controls 1150~1220 DEG C of scopes;
3) according to continuous casting steel billet different section size 150 × 150mm~240 × 240mm, control heat time heating time is 130~240min;
4) in heating furnace nozzle, add an adjustable plate, make ejection air-flow and horizontal direction angle adjustable within the scope of m °~n °, cause that heating furnace combustion flame is adjustable within the scope of m °~n ° with the angle (namely flame sprays into angle) of steel billet;Utilizing adjustable plate in nozzle, burn in the commutation cycle (including burning time and truce time) at heating furnace, control flame in the following manner and spray into angle: burning time, flame sprays into even angle and adjusts to n ° from m °;(cease fire the time) during commutation, adjustable plate in nozzle is recalled to original place, it is ensured that flame burning time of next burning commutation cycle sprays into even angle and adjusts to n ° from m °;Described m=9~11, described n=14~18.
Further, described step 1) in, the continuous casting degree of superheat is controlled 10~22 DEG C of scopes;Described step 2) in, bringing-up section being controlled temperature 1150~1220 DEG C of scopes, soaking zone temperature is 1155~1220 DEG C of scopes.
Further, described step 3) in, the control of heating steel billet time is 130~210min.
Further, described step 4) in, n=16~18.
Further, described step 4) in, the heating furnace burning commutation cycle is 100~180s, and angle step when flame sprays into angle adjustment is 1~1.5 °, and time step is 10~15s.
Compared with prior art, heating furnace burner noz(zle) only need to be added an adjustable plate by the present invention, the air-flow angle making burning has slight adjustment, without transforming any production equipment, without existing production technology is made Important Adjustment, namely can ensure that the strand homogeneous temperature of heating in stove, thus reaching to control or reduce carbide liquid-extraction rank in bearing steel.
Secondly, regulate combustion flame angle and can make the steel billet temperature Quick uniform of heating, so that it may reduce heating-up temperature and heat time heating time, reduce production cost, namely save the energy, protection environment, improve again cost performance and the market competitiveness of product.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in more detail.
The method of the present invention comprises the steps:
1) when smelting, the Steel Melt for Continuous Casting degree of superheat is controlled 10~25 DEG C of scopes;
2) continuous casting steel billet that heating obtains after smelting, bringing-up section temperature controls 1100~1220 DEG C of scopes, and soaking zone temperature controls 1150~1220 DEG C of scopes;
3) according to continuous casting steel billet different section size 150 × 150mm~240 × 240mm, control heat time heating time is 130~240min;
4) in heating furnace nozzle, add an adjustable plate, make ejection air-flow and horizontal direction angle adjustable within the scope of m °~n °, cause that heating furnace combustion flame is adjustable within the scope of m °~n ° with the angle of steel billet;Utilize adjustable plate in nozzle; burn in the commutation cycle at heating furnace; control heating furnace flame in the following manner and spray into angle: burning time; make flame spray into even angle to adjust to n ° from m °; (cease fire the time) during commutation and adjustable plate in nozzle is recalled to original place, it is ensured that flame burning time of next burning commutation cycle sprays into even angle and adjusts to n ° from m °;Described m=9~11, described n=14~18.The burning commutation cycle of heating furnace is 100~180s.
Embodiment 1
GCr15 bearing steel A is mainly composed of: [C]: 1.01%, [Si]: 0.24%, [Mn]: 0.36%, [Cr]: 1.52%, [P]: 0.013%, [S]: 0.002%, [Mo]: 0.04%, [Cu]: 0.15%, [Ni]: 0.04%, all the other are ferrum and impurity.
Electric furnace smelting, Cross Section of CC Billet are of a size of: 150 × 150mm, and continuous casting production temperature is respectively as follows: 1475 DEG C, 1470 DEG C, 1467 DEG C (GCr15 molten steel liquidus temperature is: 1450 DEG C, and the degree of superheat is respectively as follows: 25 DEG C, 20 DEG C, 17 DEG C);
Adding hot continuously cast material in long 34m × wide 9.8m passage built-in regenerative walking beam furnace, bringing-up section controls temperature 1150~1175 DEG C of scopes, and soaking zone temperature is 1155~1175 DEG C of scopes;
Control whole heat time heating time as 130min;
The heating furnace burning commutation cycle is 100s, wherein burning time and the time of truce are respectively 50s, incipient combustion flame sprays into angle and is set to 9 °, at interval of 10s clock (namely time step is 10s), utilize adjustable plate in nozzle to regulate flame and spray into angle 1 ° (namely angle step is 1 °), namely in burning time, flame sprays into angle and is respectively as follows: 10 °, 11 °, 12 °, 13 °, 14 °, burn after reversal, adjustable plate is recalled to original place (now this side nozzle unburned) again, ensure that the flame of next combustion period sprays into angle and adjusts to 14 ° from 9 °.
Actual measurement start rolling temperature is respectively as follows: 1055 DEG C, 1072 DEG C, 1093 DEG C, 1080 DEG C, 1060 DEG C, 1078 DEG C, 1095 DEG C, 1079 DEG C, 1065 DEG C, with bar steel billet maximum temperature difference: 40 DEG C.Rolling Φ 25mm round steel, belongs to the unannealed material of hot rolling.
Detecting this stove GCr15 steel carbide liquid-extraction is: 0.5 grade, 0.5 grade, 0.5 grade, 0.5 grade, and 0.5 grade (≤Φ 60mm round steel liquation criterion of acceptability≤2.0 grade, detect 5 groups of samples;> Φ 60mm round steel liquation criterion of acceptability≤2.5 grade, detect 3 groups of samples).
Embodiment 2
GCr15 bearing steel B is mainly composed of: [C]: 0.99%, [Si]: 0.29%, [Mn]: 0.33%, [Cr]: 1.49%, [P]: 0.011%, [S]: 0.001%, [Mo]: 0.04%, [Cu]: 0.12%, [Ni]: 0.03%, all the other are ferrum and impurity.
Converter smelting, Cross Section of CC Billet are of a size of: 240 × 240mm, and continuous casting production temperature is respectively as follows: 1467 DEG C, 1462 DEG C, 1460 DEG C (degree of superheat is respectively as follows: 17 DEG C, 12 DEG C, 10 DEG C);
Adding hot continuously cast material in long 24m × wide 9.8m passage built-in regenerative walking beam furnace, bringing-up section controls temperature 1185~1220 DEG C of scopes, and soaking zone temperature is 1180~1220 DEG C of scopes;
Control whole heat time heating time as 240min;
The heating furnace burning commutation cycle is 180s; wherein burning time and the time of truce are respectively 90s; incipient combustion flame sprays into angle and is set to 9 °; at interval of 15s clock; utilize the adjustable plate in nozzle to adjust flame and spray into angle 1.5 °; namely in burning time; flame sprays into angle and is respectively as follows: 10.5 °, 12 °, 13.5 °, 15 °, 16.5 °, 18 °; burn after reversal; adjustable plate is recalled to original place (now this side nozzle unburned) again, it is ensured that the flame of next combustion period sprays into angle and adjusts to 18 ° from 9 °.
Actual measurement start rolling temperature is respectively as follows: 1084 DEG C, 1092 DEG C, 1099 DEG C, 1090 DEG C, 1085 DEG C, 1096 DEG C, 1104 DEG C, 1090 DEG C, 1085 DEG C, with bar steel billet maximum temperature difference: 20 DEG C.Rolling Φ 80mm round steel, belongs to the unannealed material of hot rolling.
Detecting this stove GCr15 steel carbide liquid-extraction is: 1.0 grades, 1.0 grades, 1.0 grades.
Embodiment 3
GCr15 bearing steel C is mainly composed of: [C]: 1.00%, [Si]: 0.25%, [Mn]: 0.30%, [Cr]: 1.45%, [P]: 0.012%, [S]: 0.002%, [Mo]: 0.04%, [Cu]: 0.13%, [Ni]: 0.02%, all the other are ferrum and impurity.
Converter smelting, Cross Section of CC Billet are of a size of: 200 × 200mm, and continuous casting production temperature is respectively as follows: 1471 DEG C, 1462 DEG C, 1465 DEG C (degree of superheat is respectively as follows: 21 DEG C, 12 DEG C, 15 DEG C);
Adding hot continuously cast material in long 24m × wide 9.8m passage built-in regenerative walking beam furnace, bringing-up section controls temperature 1170~1210 DEG C of scopes, and soaking zone temperature is 1175~1210 DEG C of scopes;
Control whole heat time heating time as 180min;
The heating furnace burning commutation cycle is 150s; wherein burning time and the time of truce are respectively 75s; incipient combustion flame sprays into angle and is set to 11 °; at interval of 15s clock; utilize the adjustable plate in nozzle to adjust flame and spray into angle 1 °; namely in burning time; flame sprays into angle and is respectively as follows: 12 °, 13 °, 14 °, 15 °, 16 °; burn after reversal; adjustable plate is recalled to original place (now this side nozzle unburned) again, it is ensured that the flame of next combustion period sprays into angle and adjusts to 16 ° from 11 °.
Actual measurement start rolling temperature is respectively as follows: 1071 DEG C, 1083 DEG C, 1098 DEG C, 1087 DEG C, 1075 DEG C, 1086 DEG C, 1094 DEG C, 1081 DEG C, 1073 DEG C, with bar steel billet maximum temperature difference: 27 DEG C.Rolling Φ 60mm round steel, belongs to the unannealed material of hot rolling.
Detecting this stove GCr15 steel carbide liquid-extraction is: 1.0 grades, 0.5 grade, 0.5 grade, 1.0 grades, 1.0 grades.
Embodiment 4
GCr15 bearing steel D is mainly composed of: [C]: 1.02%, [Si]: 0.22%, [Mn]: 0.32%, [Cr]: 1.49%, [P]: 0.009%, [S]: 0.001%, [Mo]: 0.02%, [Cu]: 0.12%, [Ni]: 0.03%, all the other are ferrum and impurity.
Converter smelting, Cross Section of CC Billet are of a size of: 150 × 150mm, and continuous casting production temperature is respectively as follows: 1470 DEG C, 1468 DEG C, 1464 DEG C (degree of superheat is respectively as follows: 20 DEG C, 18 DEG C, 14 DEG C);
Adding hot continuously cast material in long 24m × wide 9.8m passage built-in regenerative walking beam furnace, bringing-up section controls temperature 1165~1210 DEG C of scopes, and soaking zone temperature is 1170~1210 DEG C of scopes;
Control whole heat time heating time as 150min;
The heating furnace burning commutation cycle is 120s; wherein burning time and the time of truce are respectively 60s; incipient combustion flame sprays into angle and is set to 10 °; at interval of 10s clock; utilize the adjustable plate in nozzle to adjust flame and spray into angle 1 °; namely in burning time; flame sprays into angle and is respectively as follows: 11 °, 12 °, 13 °, 14 °, 15 °, 16 °; burn after reversal; adjustable plate is recalled to original place (now this side nozzle unburned) again, it is ensured that the flame of next combustion period sprays into angle and adjusts to 16 ° from 10 °.
Actual measurement start rolling temperature is respectively as follows: 1068 DEG C, 1082 DEG C, 1101 DEG C, 1090 DEG C, 1073 DEG C, 1091 DEG C, 1103 DEG C, 1084 DEG C, 1072 DEG C, people having the same aspiration and interest steel billet maximum temperature difference: 35 DEG C.Rolling Φ 45mm round steel, belongs to the unannealed material of hot rolling.
Detecting this stove GCr15 steel carbide liquid-extraction is: 0.5 grade, 0.5 grade, 0.5 grade, 0.5 grade, 0.5 grade.
Comparative example
Former technique beating steel GCr15 is mainly composed of: [C]: 0.99%, [Si]: 0.27%, [Mn]: 0.33%, [Cr]: 1.48%, [P]: 0.011%, [S]: 0.002%, [Mo]: 0.02%, [Cu]: 0.12%, [Ni]: 0.02%, all the other are ferrum and impurity.
Converter smelting, Cross Section of CC Billet are of a size of: 200 × 200mm, and continuous casting production temperature is respectively as follows: 1469 DEG C, 1465 DEG C, 1465 DEG C (degree of superheat is respectively as follows: 19 DEG C, 15 DEG C, 15 DEG C);
Adding hot continuously cast material in long 24m × wide 9.8m passage built-in regenerative walking beam furnace, bringing-up section controls temperature 1185~1235 DEG C of scopes, and soaking zone temperature is 1190~1235 DEG C of scopes;
Control whole heat time heating time as 180min;
The heating furnace burning commutation cycle is 120s, and wherein burning time and the time of truce are respectively 60s, and combustion flame sprays into angle and immobilizes.
Actual measurement start rolling temperature is respectively as follows: 1062 DEG C, 1083 DEG C, 11124 DEG C, 1097 DEG C, 1068 DEG C, 1086 DEG C, 1130 DEG C, 1108 DEG C, 1071 DEG C, with bar steel billet maximum temperature difference: 68 DEG C.Rolling Φ 60mm round steel, belongs to the unannealed material of hot rolling.
Detecting this stove GCr15 steel carbide liquid-extraction is: 1.0 grades, 0.5 grade, 1.5 grades, 1.5 grades, 1.0 grades.
The result that the round steel assay adopting invented technology to produce in each embodiment and comparative example Central Plains technique steel grade compare is compiled in table 1, can be seen that the carbide liquid-extraction rank of steel grade of the present invention is highly uniform, and under equal rolling specs, it is substantially less than the bearing steel carbide liquid-extraction rank of former explained hereafter.
Table 1 embodiment steel grade and the contrast of former technique steel grade

Claims (5)

1. one kind is reduced carbide liquid-extraction level method for distinguishing in high-carbon-chromium bearing steel, it is characterised in that: the method comprises the steps:
1), when smelting, the Steel Melt for Continuous Casting degree of superheat is controlled 10~25 DEG C of scopes;
2) continuous casting steel billet that heating obtains after smelting, bringing-up section temperature controls 1100~1220 DEG C of scopes, and soaking zone temperature controls 1150~1220 DEG C of scopes;
3) according to continuous casting steel billet different section size 150 × 150mm~240 × 240mm, control heat time heating time is 130~240min;
4) add an adjustable plate at heating furnace burner noz(zle), make ejection air-flow and horizontal direction angle adjustable within the scope of m °~n °, cause that flame sprays into angle adjustable within the scope of m °~n °;Utilize adjustable plate in nozzle, burn in the commutation cycle at heating furnace, control heating furnace flame in the following manner and spray into angle: burning time, flame sprays into even angle and adjusts to n ° from m °, during commutation, adjustable plate in nozzle is recalled to original place, it is ensured that flame burning time of next burning commutation cycle sprays into even angle and adjusts to n ° from m °;Described m=9~11, described n=14~18.
2. carbide liquid-extraction level method for distinguishing in reduction high-carbon-chromium bearing steel according to claim 1, it is characterised in that: described step 1) in, the continuous casting degree of superheat is controlled 10~22 DEG C of scopes;Described step 2) in, bringing-up section being controlled temperature 1150~1220 DEG C of scopes, soaking zone temperature is 1155~1220 DEG C of scopes.
3. carbide liquid-extraction level method for distinguishing in reduction high-carbon-chromium bearing steel according to claim 1 and 2, it is characterised in that: described step 3) in, the control of heating steel billet time is 130~210min.
4. carbide liquid-extraction level method for distinguishing in reduction high-carbon-chromium bearing steel according to claim 1 and 2, it is characterised in that: described step 4) in, n=16~18.
5. carbide liquid-extraction level method for distinguishing in reduction high-carbon-chromium bearing steel according to claim 3, it is characterized in that: described step 4) in, the heating furnace burning commutation cycle is 100~180s, and angle step when flame sprays into angle adjustment is 1~1.5 °, and time step is 10~15s.
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