CN110205559A - A kind of tensile strength >=510MPa grades of the axle housing steel and production method of excellent surface quality - Google Patents

A kind of tensile strength >=510MPa grades of the axle housing steel and production method of excellent surface quality Download PDF

Info

Publication number
CN110205559A
CN110205559A CN201910478370.9A CN201910478370A CN110205559A CN 110205559 A CN110205559 A CN 110205559A CN 201910478370 A CN201910478370 A CN 201910478370A CN 110205559 A CN110205559 A CN 110205559A
Authority
CN
China
Prior art keywords
slab
steel
rolling
axle housing
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201910478370.9A
Other languages
Chinese (zh)
Other versions
CN110205559B (en
Inventor
魏兵
梁文
张扬
张鹏武
刘登文
徐峰
习天辉
杜明
王世森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Iron and Steel Co Ltd
Original Assignee
Wuhan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Iron and Steel Co Ltd filed Critical Wuhan Iron and Steel Co Ltd
Priority to CN201910478370.9A priority Critical patent/CN110205559B/en
Publication of CN110205559A publication Critical patent/CN110205559A/en
Application granted granted Critical
Publication of CN110205559B publication Critical patent/CN110205559B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper

Landscapes

  • Chemical & Material Sciences (AREA)
  • 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 Sheet Steel (AREA)
  • Metal Rolling (AREA)

Abstract

A kind of tensile strength >=510MPa grades of axle housing steel of excellent surface quality, chemical component and wt% are as follows: C:0.10 ~ 0.20%, Si:0.40 ~ 0.50%, Mn:1.4 ~ 1.6%, S :≤0.005%, P :≤0.015%, Cu:0.020 ~ 0.030%, Als:0.025 ~ 0.050%；Production method: slab is heated after smelting and being cast into base；To slab fixed width；Roughing；Finish rolling；Section cooling；It batches.The present invention is enriched with Cu element in matrix and iron scale interface, since Cu shows liquid under high temperature, so that slab belt steel surface iron scale after high-pressure water descaling be made to completely remove by adding a certain amount of Cu on the basis of C-Si-Mn component system.And entire hot-rolled process controls simple possible, improves the qualification rate of product to 95% or more, production cost reduces by 200 ~ 300 yuan/ton of steel.

Description

A kind of tensile strength >=510MPa grades of the axle housing steel and production method of excellent surface quality
Technical field
The present invention relates to many automobile steels and production methods, in particular to a kind of tensile strength >=510MPa grades of axle housing steel And production method.
Background technique
Hot Rolling Automobile axle housing is to install the basic part of main reducing gear, differential mechanism, semiaxis, wheel hub and suspension, while it is protected Each component in transmission system, dosage is big in China's commercial vehicle, is widely used in each commercial vehicle enterprise.It is a large amount of to use 14 The hot rolled steel plate of~20mm thickness makes press axle housing.There are mainly two types of press axle housing forming modes: the first be drop stamping at Shape, hot press-formed used steel plate thickness is 14~20mm, and steel plate is heated to 800~900 DEG C in induction furnace, high temperature mould Have stamping.Second is cold punching pressing formation, but the thickness of axle housing steel is reduced to 12mm, forming technology by 14~16mm It is relatively easy, stock utilization is high, production cost is low.Regardless of which kind of forming mode used, raw material are required to good Forming property, cold-bending property, therefore such steel grade is all made of the carbon manganese component system of " the high silicon of high-carbon ", addition when ingredient designs The V-N steels such as a small amount of Nb, Ti, meet its performance requirement.In general axle housing steel, silicone content 0.3~0.6%, due to Si is first oxidized to SiO under the high temperature conditions2, then SiO2It reacts to form fayalite phase with the FeO in surface oxide layer (Fe2SiO4), it is easily enriched at the faying face of iron scale and matrix and the inside of iron scale, enhances iron scale Adhesive force makes belt steel surface iron scale not completely remove clean and generate serious tiger fur line defect.Product is after user After continuous blasting process, the roughness of belt steel surface is inconsistent, the roughness of tiger fur line fault location and the roughness Rz phase normally located Poor 10um, steel surface roughness is inconsistent, and frictional force is different when leading to punching press, and piece surface can have different degrees of drawing Hair, influences the quality of part, while also needing to repair mold, influences the efficiency of the production of user.Therefore, how effectively Reduction axle housing steel tensile strength be greater than the surface 510MPa tiger fur line defect be this field one of technological difficulties urgently to be resolved.
Through retrieving:
The document that Chinese Patent Application No. is 200910063835.0, it discloses a kind of " tensile strength 510MPa grades of vapour Automobile-used hot rolling stamping axle housing steel and preparation method thereof ".Its chemical component and weight percent content are as follows: C:0.12~ 0.20%%, Si:0.20~0.60%, Mn:1.20~1.60%, P≤0.03%, S≤0.008%, Als:0.01~ 0.06% and Ti:0.005~0.030%, remaining is Fe, and continuous casting steel billet heating temperature is at 1160~1200 DEG C, roughing outlet temperature 1040~1080 DEG C, 810~850 DEG C of finishing temperature, 580~620 DEG C of coiling temperature of degree.Strip after finish to gauge is after section cooling It batches, 35 DEG C of the coolant water temperature < of section cooling, cooling velocity >=20 DEG C/s, by above measure, obtaining has high intensity With excellent press formability, welding performance energy, product is not only suitable for hot press-formed technique, and is suitable for cold punching pressing formation work Skill, stamping rebound is small, shape retention is excellent.
The document that Chinese Patent Application No. is 201410432234.3, disclose " a kind of 600MPa grades of automobile axle housing steel and Its production method ", at being grouped as are as follows: C:0.21~0.26%%, Si:0.51~0.60%, Mn:1.10~1.50%, P≤ 0.02%, S≤0.01%, V:0.05~0.06%, N:0.012~0.016%, Als:0.01~0.06% and Ti:0.005~ 0.030%, remaining is Fe and inevitable impurity, wherein V:N≤5: slab is heated to 1150 DEG C by the document in heating furnace ~1220 DEG C, heating time 180min, roughing rolls 6~8 passages, and finish rolling rolls 6 or 7 passages, controls entry temperature at finishing It is 950~990 DEG C, finishing temperature is 800~840 DEG C, carries out section cooling using front end refrigerating mode, opens cold temperature and be not less than It 780 DEG C, is batched, coiling temperature is 540~560 DEG C.The document is by accurate V, N content and cooling controlling and rolling controlling process window Mouthful, 600MPa grades of automobile axle housing hot-strips are produced, coil of strip has good intensity and toughness, while can guarantee 800 DEG C Every mechanical performance index of the above hot forming rear axle housing.
The document that Chinese Patent Application No. is 201510490392.9, it discloses a kind of " cold machine-shaping axle housing steels And its manufacturing method ", chemical component and mass percent meter contain are as follows: C:0.08~0.18%%, Si:0.10~0.45%, Mn:1.20~2.5%, P≤0.02%, S≤0.010%, Als:0.02~0.35% and Ti:0.01~0.05%, V:0.02 ~0.10%, Nb:0.015~0.10%, Cr:0.02~0.5%, remaining is Fe；Process flow, which is that KR desulfurization → complete three are de-, to be turned Furnace smelting → LF refining → continuous casting → heating furnace reheating → roughing → finish rolling → section cooling → is batched, wherein heating of plate blank temperature Degree is 1230~1300 DEG C, five passes of roughing, and slab adds up reduction ratio and is greater than 75%, roughing outlet temperature 970~1050 DEG C, seven passes of finish rolling control last passes reduction ratio more than or equal to 8%, and controlled rolling finishing temperature is 830~ 870 DEG C, refrigerating mode is concentrated using leading portion, section cooling is carried out to strip, coiling temperature is 520~580 DEG C.It finally obtains low Cost, cold forming axle housing steel of good performance.
To sum up state document it is found that there is deficiency below: document above is essentially all the ingredient of the C-Si-Mn of use System Design, while it being added to a small amount of Nb, V, Ti microalloy, all it is to be accounted for from the angle of product development, does not consider The problems such as scale on surface defect of axle housing steel product.Meanwhile Cu is not added in the component system of existing axle housing steel, mainly Since the melting temperature of Cu is low, it is easy to form enrichment at the interface of matrix and iron scale during heating, when temperature is higher than At 1083 DEG C of the melting temperature of Cu, the liquid richness Cu phase of formation is invaded from iron scale/basal body interface to austenite grain boundary, is reduced Intergranular binding force, and accelerate the oxidation of steel, so cracked in continuous casting or the operation of rolling, the surface quality such as peeling are asked Topic.Easily cause axle housing steel molding cracking, therefore, the component system of axle housing steel be all using C-Si-Mn, add a small amount of Nb, V, Ti microalloy realizes >=510MPa grades of related kind existence.For the equipment of present hot rolling producing line, the life of axle housing steel Produce it is relatively easy, but the surface quality of product to material application play decisive role, serious scale on surface is asked Topic, such as tiger fur line defect, will lead to the risk that great quality objection occurs in material, reduces the competitiveness of product.
Summary of the invention
The invention reside in the shortcomings of the prior art is overcome, provide a kind of by the basis of C-Si-Mn component system On, a certain amount of Cu is added, and optimize to heating of plate blank technique, to control the scale structure of steel slab surface, makes slab Iron scale based on FeO, Cu element is enriched at matrix and iron scale interface, to keep belt steel surface iron scale complete Tensile strength >=510MPa grades of the axle housing steel and production method of removal.
Realize the measure of above-mentioned purpose:
A kind of tensile strength >=510MPa grades of axle housing steel of excellent surface quality, chemical component and weight percent content Are as follows: C:0.10~0.20%, Si:0.40~0.50%, Mn:1.4~1.6%, S :≤0.005%, P :≤0.015%, Cu: 0.020~0.030%, Als:0.025~0.050%, remaining is Fe and inevitable impurity.
Preferably: the weight percent content of the Cu is 0.020~0.027%.
A kind of method for reducing by tensile strength >=510MPa grades of axle housing steel surface tiger fur line is produced, step:
1) heat after smelting and being cast into base to slab: total heating time inside furnace is controlled in 180min~210min, and Keep positive pressure in 10~12Pa in furnace；
A, slab stops 60~70min under conditions of inputting and heating without coal gas in preheating section；
B, it is heated into bringing-up section, total heating time control is in 80~100min, in which:
One section of heating is 0.9~1.0 40~60min of lower heating in air-fuel ratio；
Two sections of heating be 1.15~1.25 in air-fuel ratio under be heated to 1220~1260 DEG C, heating time control 40~ 50min；
C, soaking is carried out, 35~50min of soaking under being 1.05~1.1 in air-fuel ratio, soaking temperature is 1220~1260；
2) fixed width is carried out to slab:
As slab width≤1550mm, the operation of rolling takes wide rolling, is not necessarily to fixed width, and slab is only empty to cross constant width machine；
As 1550 < slab width≤1800mm, the iron scale of steel slab surface is removed completely, according still further to routine first Carry out fixed width；
3) roughing is carried out
After the first milling train pair rolling, 5 passes are carried out into the second milling train, and complete in the rolling of 5 passages Portion carries out squama, and controls outlet temperature at 1020~1060 DEG C；
4) roughing terminates to carry out finish rolling immediately, controls finishing temperature at 820~850 DEG C；
In the finish rolling stage:
In crossing process, lubricating oil is in closed state；Threading terminates and stablizes into when finish rolling, using lubricating process It is rolled；
The reduction ratio of each passage distributes successively in finish rolling are as follows: and first time is 30~40%, and the second passage is 30~40%, Third passage is 30~35%, and four-pass is 20~25%, and the 5th passage is 15~20%, and the 6th passage is 10~15%, 7th passage is 5~10%；
After finish rolling when taking the lead to have passed through 7 rack, with i.e. by mill speed control in 2m/s~4m/s；
5) section cooling is carried out, it is cooling only with leading portion, and it is cooled to coiling temperature；
6) it is batched, coiling temperature is at 570~600 DEG C.
The effect and mechanism of each element and main technique of the present invention:
C: carbon is cheap solution strengthening element, according to the application range of this steel grade, is mainly used for processing automobile axle housing, adopt With cold forming or thermoforming+welding mode, therefore it is required that material mechanical property with higher and good welding performance. If its content, less than 0.10%, the intensity of material can not meet requirement；If its content is greater than 0.20%, it is not able to satisfy The good welds performance of material.So its content is limited to 0.10~0.20%
Si: silicon is cheap and effective deoxygenation of liquid steel element, while being also solution strengthening element.If its content < 0.40%, the intensity of material is inadequate；If its content > 0.5%, can deteriorate hot rolled sheet metal surface quality, generated in surface of steel plate Serious tiger fur line defect.So its content is limited between 0.4~0.5%.
Mn: manganese is the effective element for improving intensity and toughness.If its content is lower than 1.4%, it is not able to satisfy material Intensity requirement；But if adding the Mn of volume, the harden ability of steel will increase, due to welding the appearance of hardened layer, and keep crackle quick Perception increases, and therefore its content is limited between 1.4~1.6% by the cost of alloy for increasing material
P: in order to avoid the toughness of welding performance, punching performance, material deteriorates, its content is limited to 0.015% Below.
S: harmful element exists in the form of manganese sulfide in steel.It is this that be mingled with to the impact flexibility of steel be unfavorable.And it makes At the anisotropy of performance, therefore, it is necessary to control more lower better by the sulfur content in steel.Based on to Steel Sheet technique And the considerations of manufacturing cost, its content is defined in 0.005% or less.
Cu: since there is Si stronger solution strengthening effect to be added in steel higher to guarantee the performance of material Si amount, and the interface that Si is easily enriched in matrix and iron scale forms olivine phase (Fe2SiO4), once in iron scale and base Continuous Fe is formed between body2SiO4Layer, can play iron scale " pinning ", and iron scale is caused to lack during the rolling process It falls into, deteriorates the surface quality of hot rolled steel plate, influence material subsequent use.Therefore it is directed to the steel of this high Si content, in steel A certain amount of Cu is added, makes Cu in matrix and Fe2SiO4Interface enrichment, the fusing point of Cu is 1083 DEG C, at 1100~1200 DEG C When, Cu is liquid, and high pressure water is made easier to remove scale on surface.Cu also functions to the work of certain reinforced ferrite simultaneously With adding certain copper in ferrite, its corrosion resistance in certain reductants can be improved and improve the tough of steel Property.Especially when being used in combination with P, steel can be improved to the slushing oil of atmosphere.When its content is less than 0.20%, add Cu's Effect is unobvious, but when its content is greater than 0.30%, is easy to produce hot-short, causes the plasticity of material to significantly reduce, cause material Expect stamping cracking.Therefore, its content is limited between 0.020~0.030%, preferably the content of Cu be 0.020~ 0.027%, so that the tiger fur line defect of belt steel surface be greatly reduced.
Als: aluminium formation is added for deoxidation, when Als content is less than 0.020%, cannot play its effect；If Als too high levels are easy to form alumina inclusion in belt steel surface, therefore, the control of the content of Als 0.025~0.050% it Between.
Why the present invention in preheating section does not input mixed gas flow, but gives steel billet to carry out by the heat radiation of back segment Preheating takes full advantage of thermal energy, reduces energy consumption, decreases production cost.
Why the present invention controls the air-fuel ratio of one section of heating 0.9~1.0, is since one plus section needs are heated slowly to Target temperature, while guaranteeing that slab temperature is uniform.If air-fuel ratio is too small, heating efficiency is low, is unable to reach target temperature；Air-fuel Than excessive, slab oxidization burning loss increases, and lumber recovery reduces.
Why the present invention controls two sections of air-fuel ratios of heating and is heated to 1220~1260 DEG C under 1.15~1.25, when heating Between control in 40~50min, be to need slab in a relatively short period of time due to two sections of the heating heating process using short time high temperature It is raised to target temperature, shortens slab residence time at high temperature.If air-fuel is relatively low, target temperature is not achieved in slab；If Air-fuel is relatively high, and residence time is longer at high temperature for slab, is easy to produce surface defect.
Why the present invention controls soaking zone air-fuel ratio 1.05~1.1, is since soaking zone main purpose is to make slab Temperature is uniform.Air-fuel ratio is excessively high, it will increases scaling loss, is easy to produce surface defect；Air-fuel ratio is too low, and wave easily occurs in board briquette Dynamic, uniformity is poor.
Why the present invention controls the reduction ratio distribution of each passage in finish rolling successively are as follows: and first time is 30~40%, the Two passages are 30~40%, and third passage is 30~35%, and four-pass is 20~25%, and the 5th passage is 15~20%, the Six passages are 10~15%, and it is with steel due to this axle housing using zerolling, finish rolling open rolling that the 7th passage, which is 5~10%, Temperature correction often rolls low 30~50 DEG C, to guarantee the operation of rolling smoothly and rolling rear good template, mm finishing mill unit F1, F2, F3 Rack reduction ratio more normally rolls big 3~5%, 3~4%, 2~3% respectively.
Compared with prior art, the features of the present invention: by adding a certain amount of on the basis of C-Si-Mn component system Cu, heating of plate blank technique is optimized, the scale structure of steel slab surface is controlled, makes Cu element in matrix and iron oxide Skin interface enrichment, since Cu shows liquid under high temperature, to make slab belt steel surface iron scale after high-pressure water descaling It completely removes.And entire hot-rolled process controls simple possible, the effective qualification rate for improving product to 95% or more, production cost Reduce by 200~300 yuan/ton.
Detailed description of the invention
Fig. 1 is axle housing steel surface appearance figure produced by the invention；
The axle housing steel surface appearance figure that Fig. 2 is produced before being the present invention.
Specific embodiment
The present invention is described in detail below:
Table 1 is various embodiments of the present invention component comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and comparative example key detection case list；
Various embodiments of the present invention produce according to the following steps:
1) heat after smelting and being cast into base to slab: total heating time inside furnace is controlled in 180min~210min, and Keep positive pressure in 10~12Pa in furnace；
A, slab stops 60~70min under conditions of inputting and heating without coal gas in preheating section；
B, it is heated into bringing-up section, total heating time control is in 80~100min, in which:
One section of heating is 0.9~1.0 40~60min of lower heating in air-fuel ratio；
Two sections of heating be 1.15~1.25 in air-fuel ratio under be heated to 1220~1260 DEG C, heating time control 40~ 50min；
C, soaking is carried out, 35~50min of soaking under being 1.05~1.1 in air-fuel ratio, soaking temperature is 1220~1260；
2) fixed width is carried out to slab:
As slab width≤1550mm, the operation of rolling takes wide rolling, is not necessarily to fixed width, and slab is only empty to cross constant width machine；
As 1550 < slab width≤1800mm, the iron scale of steel slab surface is removed completely, according still further to routine first Carry out fixed width；
3) roughing is carried out
After the first milling train pair rolling, 5 passes are carried out into the second milling train, and complete in the rolling of 5 passages Portion carries out squama, and controls outlet temperature at 1020~1060 DEG C；
4) roughing terminates to carry out finish rolling immediately, controls finishing temperature at 820~850 DEG C；
In the finish rolling stage:
In crossing process, lubricating oil is in closed state；Threading terminates and stablizes into when finish rolling, using lubricating process It is rolled；
The reduction ratio of each passage distributes successively in finish rolling are as follows: and first time is 30~40%, and the second passage is 30~40%, Third passage is 30~35%, and four-pass is 20~25%, and the 5th passage is 15~20%, and the 6th passage is 10~15%, 7th passage is 5~10%；
After finish rolling when taking the lead to have passed through 7 rack, with i.e. by mill speed control in 2m/s~4m/s；
5) section cooling is carried out, it is cooling only with leading portion, and it is cooled to coiling temperature；
6) it is batched, coiling temperature is at 570~600 DEG C.
1 various embodiments of the present invention of table and comparative example chemical component list (wt%)
2 various embodiments of the present invention of table and comparative example main technologic parameters control list
Table 3 is the situation list of various embodiments of the present invention mechanics properties testing
From table 3 it can be seen that the present invention provides a kind of reduction axle housing for the deficiency in the presence of the production of existing axle housing steel The method of steel surface tiger fur line defect, by adding a certain amount of Cu on the basis of C-Si-Mn component system, to slab plus Thermal process optimizes, and controls the scale structure of steel slab surface, is enriched with Cu element in matrix and iron scale interface, by Cu shows liquid under high temperature, so that slab belt steel surface iron scale after high-pressure water descaling be made to completely remove.This life Production method can not only obtain the axle housing steel that tensile strength is greater than 510MPa grades, and product has good surface quality, effectively The qualification rate of product is improved to 95% or more, reduces product since what surface tiger fur line occurred changes the original sentence to, production cost reduces by 200 ~300 yuan/ton, entire hot-rolled process controls simple possible.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.

Claims (3)

1. a kind of tensile strength >=510MPa grades of axle housing steel of excellent surface quality, chemical component and weight percent content Are as follows: C:0.10 ~ 0.20%, Si:0.40 ~ 0.50%, Mn:1.4 ~ 1.6%, S :≤0.005%, P :≤0.015%, Cu:0.020 ~ 0.030%, Als:0.025 ~ 0.050%, remaining is Fe and inevitable impurity.
2. a kind of tensile strength >=510MPa grades of axle housing steel of excellent surface quality as described in claim 1, it is characterised in that: institute The weight percent content for stating Cu is 0.020 ~ 0.027%.
3. a kind of production method for reducing by tensile strength >=510MPa grades of axle housing steel surface tiger fur line as described in claim 1, Step:
1) heat after smelting and being cast into base to slab: total heating time inside furnace control is protected in 180min ~ 210min, and in furnace Positive pressure is held in 10 ~ 12Pa；
A, slab stops 60 ~ 70min under conditions of inputting and heating without coal gas in preheating section；
B, it is heated into bringing-up section, total heating time control is in 80 ~ 100min, in which:
One section of heating is 0.9 ~ 1.0 40 ~ 60min of lower heating in air-fuel ratio；
Two sections of heating be 1.15 ~ 1.25 in air-fuel ratio under be heated to 1220 ~ 1260 DEG C, heating time controls in 40 ~ 50min；
C, soaking is carried out, 35 ~ 50min of soaking under being 1.05 ~ 1.1 in air-fuel ratio, soaking temperature is 1220 ~ 1260；
2) fixed width is carried out to slab:
As slab width≤1550mm, the operation of rolling takes wide rolling, is not necessarily to fixed width, and slab is only empty to cross constant width machine；
As 1550mm < slab width≤1800mm, the iron scale of steel slab surface is removed first it is clean, according still further to routine into Row fixed width；
3) roughing is carried out
After the first milling train pair rolling, carry out 5 passes into the second milling train, and in the rolling of 5 passages all into Row squama, and outlet temperature is controlled at 1020 ~ 1060 DEG C；
4) roughing terminates to carry out finish rolling immediately, controls finishing temperature at 820 ~ 850 DEG C；
In the finish rolling stage:
In crossing process, lubricating oil is in closed state；Threading terminates and stablizes into when finish rolling, is carried out using lubricating process Rolling；
The reduction ratio of each passage distributes successively in finish rolling are as follows: first time is 30 ~ 40%, and the second passage is 30 ~ 40%, third passage It is 30 ~ 35%, four-pass is 20 ~ 25%, and the 5th passage is 15 ~ 20%, and the 6th passage is 10 ~ 15%, and the 7th passage is 5 ~ 10%；
After finish rolling when taking the lead to have passed through 7 rack, with i.e. by mill speed control in 2m/s ~ 4m/s；
5) section cooling is carried out, it is cooling only with leading portion, and it is cooled to coiling temperature；
6) it is batched, coiling temperature is at 570 ~ 600 DEG C.
CN201910478370.9A 2019-06-03 2019-06-03 Axle housing steel with excellent surface quality and tensile strength of more than or equal to 510MPa and production method thereof Active CN110205559B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910478370.9A CN110205559B (en) 2019-06-03 2019-06-03 Axle housing steel with excellent surface quality and tensile strength of more than or equal to 510MPa and production method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910478370.9A CN110205559B (en) 2019-06-03 2019-06-03 Axle housing steel with excellent surface quality and tensile strength of more than or equal to 510MPa and production method thereof

Publications (2)

Publication Number Publication Date
CN110205559A true CN110205559A (en) 2019-09-06
CN110205559B CN110205559B (en) 2021-03-02

Family

ID=67790512

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910478370.9A Active CN110205559B (en) 2019-06-03 2019-06-03 Axle housing steel with excellent surface quality and tensile strength of more than or equal to 510MPa and production method thereof

Country Status (1)

Country Link
CN (1) CN110205559B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113403536A (en) * 2021-06-16 2021-09-17 北京理工大学重庆创新中心 Hot stamping formed steel with super-strong high-temperature oxidation resistance and preparation method thereof
CN113957355A (en) * 2021-10-28 2022-01-21 攀钢集团攀枝花钢铁研究院有限公司 Axle housing steel for 510 MPa-level hot stamping and preparation method thereof
CN114015934A (en) * 2021-10-18 2022-02-08 武汉钢铁有限公司 600 MPa-level hot continuous rolling dual-phase structure axle housing steel and production method thereof
CN115011774A (en) * 2022-06-15 2022-09-06 武汉钢铁有限公司 Method for producing high-surface-quality automobile girder steel by adopting CSP (cast Steel plate)
CN115109905A (en) * 2022-06-28 2022-09-27 武汉钢铁有限公司 Automobile crossbeam steel plate with excellent surface quality and manufacturing method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008274355A (en) * 2007-04-27 2008-11-13 Jfe Steel Kk Method for manufacturing hot-rolled steel plate superior in surface quality, fracture toughness and sour corrosion resistance
CN102247985A (en) * 2011-07-01 2011-11-23 河北省首钢迁安钢铁有限责任公司 Method for producing steel for stirring tank with limit specification through hot rolling
CN102864384A (en) * 2012-08-31 2013-01-09 中国重汽集团济南动力有限公司 High-strength automobile axle housing material and method for manufacturing axle housing
CN103212571A (en) * 2013-04-18 2013-07-24 湖南华菱湘潭钢铁有限公司 Method for producing oxide scale capable of preventing steel plate surface from getting rusty
CN106001128A (en) * 2016-05-19 2016-10-12 首钢京唐钢铁联合有限责任公司 Weather-resistant steel coil surface quality control method and hot rolling process heating furnace

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008274355A (en) * 2007-04-27 2008-11-13 Jfe Steel Kk Method for manufacturing hot-rolled steel plate superior in surface quality, fracture toughness and sour corrosion resistance
CN102247985A (en) * 2011-07-01 2011-11-23 河北省首钢迁安钢铁有限责任公司 Method for producing steel for stirring tank with limit specification through hot rolling
CN102864384A (en) * 2012-08-31 2013-01-09 中国重汽集团济南动力有限公司 High-strength automobile axle housing material and method for manufacturing axle housing
CN103212571A (en) * 2013-04-18 2013-07-24 湖南华菱湘潭钢铁有限公司 Method for producing oxide scale capable of preventing steel plate surface from getting rusty
CN106001128A (en) * 2016-05-19 2016-10-12 首钢京唐钢铁联合有限责任公司 Weather-resistant steel coil surface quality control method and hot rolling process heating furnace

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113403536A (en) * 2021-06-16 2021-09-17 北京理工大学重庆创新中心 Hot stamping formed steel with super-strong high-temperature oxidation resistance and preparation method thereof
CN114015934A (en) * 2021-10-18 2022-02-08 武汉钢铁有限公司 600 MPa-level hot continuous rolling dual-phase structure axle housing steel and production method thereof
CN114015934B (en) * 2021-10-18 2023-02-28 武汉钢铁有限公司 600 MPa-level hot continuous rolling dual-phase structure axle housing steel and production method thereof
CN113957355A (en) * 2021-10-28 2022-01-21 攀钢集团攀枝花钢铁研究院有限公司 Axle housing steel for 510 MPa-level hot stamping and preparation method thereof
CN115011774A (en) * 2022-06-15 2022-09-06 武汉钢铁有限公司 Method for producing high-surface-quality automobile girder steel by adopting CSP (cast Steel plate)
CN115109905A (en) * 2022-06-28 2022-09-27 武汉钢铁有限公司 Automobile crossbeam steel plate with excellent surface quality and manufacturing method thereof

Also Published As

Publication number Publication date
CN110205559B (en) 2021-03-02

Similar Documents

Publication Publication Date Title
CN110205559A (en) A kind of tensile strength &gt;=510MPa grades of the axle housing steel and production method of excellent surface quality
CN102628148B (en) Acid-washing hot-rolled low-carbon steel without line defects on surface and production method thereof
CN107502817A (en) High grain size number pinion steel 20CrMnTiH and its production technology
CN107597844A (en) The ferrite rolling method and apparatus that endless casting rolling deep-draw is rolled up with humble carbon steel
CN102653839B (en) Low-temperature continuous-annealing interstitial-free atom cold-rolled steel plate and production method thereof
CN106319368A (en) Economical thin chain plate and manufacturing method thereof
CN106811700B (en) Thick acid-resistant X60MS hot-rolled coil and manufacturing method thereof
CN111485177A (en) Low-cost 780 MPa-grade cold-rolled dual-phase steel and production method thereof
CN102912235B (en) Hot-rolled dual-phase steel in 590MPa tensile strength grade and method for manufacturing hot-rolled dual-phase steel
CN106834886A (en) The method that Thin Specs RE65Mn steel is produced based on ESP bar strip continuous casting and rolling flow paths
CN207288353U (en) The ferrite rolling device that a kind of endless casting rolling deep-draw is rolled up with humble carbon steel
CN112430771B (en) Cold-rolled steel plate for precision stamping high-speed cutting chain saw blade and manufacturing method thereof
CN109097699A (en) A kind of 900MPa grades of hot rolling automotive frame steel and its manufacturing method
CN103556047A (en) 450MPa-grade hydrogen-induced-cracking-resistant pressure vessel steel plate and production method thereof
CN108393355A (en) A kind of manufacturing method of oil/gas well novel seamless steel tube
CN109023111A (en) A kind of 1000MPa grades of hot rolling automotive frame steel and its manufacturing method
CN107236900A (en) 700MPa containing vanadium grades of hot rolled strips used for vehicle transmission shaft, production method and applications
CN112877586A (en) Production method of high-strength and high-toughness American-standard steel rail for CR175 crane
WO2022228216A1 (en) Steel for high-temperature carburized gear shaft and manufacturing method for steel
CN115181911B (en) Super-thick Q500qE bridge steel plate and production method thereof
CN111763883A (en) Steel for hollow stabilizer bar and production method thereof
CN112159929A (en) Hot-rolled H-shaped steel for ultra-large bearing capacity buckling restrained brace and production method thereof
CN112981233B (en) Low-silicon medium-carbon gear steel suitable for cold forging processing and manufacturing method thereof
CN113462985B (en) Low-cost high-surface-hardness tool steel with excellent annealing-free bending performance
CN115261746B (en) Super-thick Q420qE bridge steel plate and production method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant