CN104209361A - Preparation method of 30CrMnSiA hexagonal cold drawn material - Google Patents
Preparation method of 30CrMnSiA hexagonal cold drawn material Download PDFInfo
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- CN104209361A CN104209361A CN201310217606.6A CN201310217606A CN104209361A CN 104209361 A CN104209361 A CN 104209361A CN 201310217606 A CN201310217606 A CN 201310217606A CN 104209361 A CN104209361 A CN 104209361A
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Abstract
The invention discloses a preparation method of a 30CrMnSiA hexagonal cold drawn material; through the steps of coiled blank annealing treatment, coiled surface defect treatment, coiled pre-coating lubricating treatment, coiled cold drawn finished product front-end deformation treatment, coiled cold drawn finished product molding treatment and the like, the produced hexagonal fastener steel 30CrMnSiA steel type meets requirements of high-quality materials, moreover, the surface of the cold drawn material has no decarburization layer and no lookable defects, the qualification rate of the finished product can reach 99.4% or more, the production cost is greatly reduced, and the high-quality raw material quality requirement in fastener manufacturing industries are met.
Description
Technical field
The present invention relates to the preparation technology of cold-drawn material, more particularly, relate to a kind of preparation method of 30CrMnSiA hexagon cold-drawn material.
Background technology
Structural alloy steel is a kind of steel alloy, and 30CrMnSiA is a kind of structural alloy steel, as the securing member making steel that structural alloy steel class is high-grade.And structural alloy steel cold-drawn material refers to: adopt cold-drawing technology technology, the alloy structure product made from steel of production, shape of product has, hexagon etc.
30CrMnSiA structural alloy steel, as making steel for fastener material, is for the manufacture of the securing member in the engine of all kinds of high-quality requirement, plant equipment.30CrMnSiA as the feature of structural alloy steel is: carbon content is 0.28 ~ 0.35%, silicone content is 0.90 ~ 1.20%, and Fe content is 0.80 ~ 1.10%, and chromium content is 0.80 ~ 1.20%, nickel content≤0.40% refining material, makes the raw material of steel for fastener through smelting, rolling, cold working.
At present, the hexagon cold-drawn material product of 30CrMnSiA structural alloy steel, supply of material standard scores regular grade, premium grade.(regular grade) of 30CrMnSiA structural alloy steel hexagon cold-drawn material supplies standard:
(1) supply of material state is delivered goods with cold drawn bar form;
(2) main performance requirements of cold drawn state delivery: decarburized layer≤1.5%S(D) mm(S refers to the distance of hexagonal steel opposite side, D refers to the diameter of circular steel), at hardness number (cold drawn)≤269HBW.
(3) surface quality: steel surface should be smooth, must not have macroscopic crackle, folding, scab and the defect such as drawing crack, and the degree of depth is no more than the defects such as indivedual pits, cut and the pit of half of steel diameter tolerance and allows to exist.
(premium grade) of 30CrMnSiA structural alloy steel hexagon cold-drawn material supplies standard:
(1) supply of material state is with cold drawn bar or coil form delivery;
(2) its main performance requirements: decarburized layer≤0.03 ㎜, hardness number (cold drawn)≤269HBW.
(3) surface quality: steel surface should be smooth, must not have macroscopic crackle, folding, scab and the defect such as drawing crack.
And at present the conventional cold-drawn material of the hexagon cold-drawn material of 30CrMnSiA structural alloy steel is prepared the technological process of production and is: circle → annealing → single-edge grinding 0.15-0.20mm → → cold drawn first hexagonal → dress annealing tubes → pickling → cold drawn second hexagonal → → cold drawn finished product hexagonal of coating lime of deoiling of coating lime of detecting a flaw → deoil is returned in pickling → cold drawn.
Adopt above-mentioned conventional manufacturing techniques, the hexagon cold-drawn material product of the 30CrMnSiA structural alloy steel of preparation, following products (regular grade) can be reached and to supply standard:
1, decarburized layer deepness is :≤1.5%S(D) mm.
2, surface quality: the degree of depth is no more than the defects such as indivedual pits, cut and the pit of half of steel diameter tolerance and allows existence.
But adopting above-mentioned conventional manufacturing techniques, there is following weak point in the hexagon cold-drawn material product (premium grade) of the 30CrMnSiA structural alloy steel of preparation:
1, decarburized layer deepness is comparatively large, is size≤1.5%S (D) mm, directly has influence on modified case hardness.
What 2, surface quality existed is no more than the defects such as pit, cut and the pit of half of steel diameter tolerance, directly has influence on the quality making securing member.
3, qualified low (being only about 86%), production cost is higher.
In sum, how preparing the 30CrMnSiA structural alloy steel hexagon cold-drawn material product of premium grade, is a technical barrier, is badly in need of effectively solving.
Summary of the invention
For the above-mentioned shortcoming existed in prior art, the object of this invention is to provide a kind of preparation method of 30CrMnSiA hexagon cold-drawn material, the hexagon cold-drawn material produced meets premium grade requirement completely.
For achieving the above object, the present invention adopts following technical scheme:
The preparation method of this 30CrMnSiA hexagon cold-drawn material, comprises the following steps:
A. adopt 30CrMnSiA hot rolling to coil as raw material, in the strong convection bell type furnace with nitrogen hydrogen protective atmosphere, carry out annealing in process, to recover plasticity;
B. blemish process is carried out to coiling after annealing;
C. off-line surface precoated shet lubricated is carried out to coiling;
D. will coil and carry out drawing deformation process on continuous drawing device, and form accurate hexagon and coil;
E. aligning hexagon is coiled and is carried out cold drawn finished product forming processes.
In step, the control overflow of described annealing in process is: be warmed up to 700 ~ 720 DEG C with stove, is incubated after 4 ~ 6 hours, is cooled to 140 DEG C or following temperature to come out of the stove.
In stepb, specifically comprise the following steps:
B1. uncoiling aligning, setting feed speed is 10 ~ 20m/min;
B2. cut, cutterhead rotating speed is controlled at 2600 ~ 3000RPM;
B3. abrasive band polishing, controls belt sander rotating speed≤230 ~ 250RPM;
B4. rolling, to obtain surface roughness≤0.8 μm, decarburized layer deepness≤0.03mm coils.
In step C, specifically comprise the following steps:
C1. degreasing, adopt concentration to be 15 ~ 20% degreasing agents, temperature controls at 40 ~ 50 DEG C, and the time is 50 ~ 70 minutes, to remove Liquid Residue during blemish process;
C2. rinse;
C3. epithelium film, adopt total acidity to be 35 ~ 40, free acidity is D3 ~ D35 film agent solution of 5.6 ~ 7.0, and dipping temperature is 65 ~ 85 DEG C, and dip time is 5 ~ 10min;
C4. rinse;
C5. go up lubricant, adopt solubility to be 5 ~ 7%, solution pH value is the LS-2 model lubricating fluid of 8 ~ 9, and dipping temperature is 75 ~ 85 DEG C, and dip time is 4 ~ 5 minutes;
C6. dry up.
In step D, specifically comprise the following steps:
D1. uncoiling and de-distortion is carried out to coiling;
D2. accurate hexagon is formed by drawing;
D2. the online hexagon that is as the criterion of collecting is coiled.
In step e, specifically comprise the following steps:
D1. aligning hexagon is coiled and is carried out de-distortion;
D2. be hexagon by cold drawing deformation;
D3. twist or essence rectify;
D4. shear and collect.
In technique scheme, the preparation method of 30CrMnSiA hexagon cold-drawn material of the present invention is by coiling blank anneal process, coil blemish process, coil precoated shet lubricated, coil cold drawn finished product front road deformation process, coil the steps such as cold drawn finished product forming processes, the hex head fastener steel 30CrMnSiA steel grade produced reaches premium grade material requirements, and the surface of cold-drawn material is without decarburized layer, without macroscopic defect, the qualification rate of finished product can reach more than 99.4%, production cost significantly declines, meet the quality requirements of raw materials that securing member makes industry high-quality.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the preparation method of hexagon cold-drawn material of the present invention.
Detailed description of the invention
Technical scheme of the present invention is further illustrated below in conjunction with drawings and Examples.
Shown in Fig. 1, the preparation method of 30CrMnSiA hexagon cold-drawn material of the present invention mainly comprises following step: coil blank anneal process, coil blemish process, coil precoated shet lubricated, coil cold drawn finished product front road deformation process, coil cold drawn finished product forming processes.Wherein, coiling blank anneal process is coil 30CrMnSiA hot rolling to anneal, and recovers plasticity; Coiling blemish process is removed face crack, scratch defect that hot rolling coils by surperficial machine cut, removed skin decarburization simultaneously; Coiling precoated shet lubricated is carry out surperficial degreasing, lubricated, to reach the surface requirements that surperficial cold-drawn is produced; Coiling cold drawn finished product front road deformation process is on continuous drawing unit, by surperficial precoated shet lubricated Hou Pan garden, takes the cold drawn one-tenth of certain deflection hexagonal front road abnormal shape to coil; Coiling cold drawn finished product forming processes is on continuous drawing device, adopts certain deflection, hexagonal front road abnormal shape is coiled to be produced into hexagon steel finished product and to coil or bar.Concrete steps are as follows:
One, blank anneal process is coiled
Ferrite+the pearlitic structrure being organized as sheet coiled by 30CrMnSiA steel grade due to hot rolling, and its plasticity extreme difference, can not adapt to drawing plastic deformation, and therefore, coiling after hot rolling takes annealing in process to recover plasticity, is convenient to carry out cold drawn plastic deformation.
The main technique main points of wire coils process are as follows:
Coil and anneal in the strong convection bell type furnace with nitrogen hydrogen protective atmosphere, this strong convection bell type furnace important technological parameters:
Effective dimensions is diameter: 3000mm; Highly: 3700mm; Protection gas type: N2, dew point :≤-60 DEG C; Nitrogen and hydrogen mixture: dew point≤-60 DEG C; Oxygen content :≤5ppm; Maximum batch 13 tons.
The control overflow of wire coils process is: be warmed up to 700 ~ 720 DEG C with stove, is incubated and is cooled to 140 DEG C or following temperature to come out of the stove after 4 ~ 6 hours.
Two, blemish process is coiled
Coil after the process of hot rolling wire coils, usually there is the defects such as scratch, crackle, decarburization in surface, in order to ensure finished surface zero defect after follow-up drawing, without the requirement of decarburization, must take coiling scarfing process, coils surface with what obtain high-quality.
Coil blemish handling process as follows:
Coil → uncoiling aligning → cutting → abrasive band polishing → rolling
Its main technique main points:
Setting feed speed 10 ~ 20m/min, cutterhead rotating speed controls at 2600 ~ 3000RPM; 1,2, No. 3 belt sander rotating speed≤230-250RPM(are stepless adjustable), after 80# abrasive band polishing, coil surface roughness Ra≤0.8 μm.The degree of depth≤the 0.03mm of decarburized layer.
Three, precoated shet lubricated is coiled
30CrMnSiA steel grade is coiled after coiling blemish process, surface zero defect, very bright and clean, remained on surface cutting fluid simultaneously, follow-up cold-drawn can not be suitable for produce, therefore, need before cold drawn finished product distortion to carry out special off-line surface precoated shet lubricated, namely first carry out Liquid Residue when degreasing removes blemish process, then carry out precoated shet lubricated.
Surface precoated shet lubricated flow process is as follows:
Degreasing → flushing → epithelium film → flushing → upper lubricant → dry up
Main technique main points are as follows:
1, degreasing process
Degreasing object: coil Liquid Residue during blemish process;
Composition Control: concentration is 15 ~ 20% degreasing agents;
Temperature and time: temperature controls 40 ~ 50 DEG C, 50 ~ 70 minutes time.
Epithelium film and lubricant technique
The control of D3-D35 film agent solution: total acidity (TA): 35 ~ 40, free acidity (FA): 5.6 ~ 7.0;
Film agent dipping temperature and time: temperature: 65 ~ 85 DEG C, dip time: 5 ~ 10min;
The control of lubricant solution: LS-2 model lubricating fluid solubility 5 ~ 7%, solution pH value is 8 ~ 9;
Lubricant impregnation temperature and time: lubricant temperature controls at 75 ~ 85 DEG C, dip time 4 ~ 5 minutes.
Four, cold drawn finished product front road deformation process is coiled:
Coiling after precoated shet lubricated, continuous drawing device carries out cold-drawn production, and the shape after cold-drawn becomes accurate hexagonal by circle and coils, and elementary production steps is as follows:
Coil (circle) → uncoiling and de-distortion → drawing (accurate hexagonal) → online (twisting) collection
Because the difficulty of 30CrMnSiA steel grade continuous drawing is very large, therefore, in drawing process, it is very important that the installation of cold deformation, mould and deformation velocity control, adopt the cold drawn mode of production of suitable deflection to be conducive to carrying out smoothly of continuous drawing, concrete production control main points are as follows:
1) cold drawn production
The plasticity index coiled according to annealing to 30CrMnSiA steel grade detects to be analyzed, and the maximum cold deformation of single pass can reach 55-60% in theory.But in actual production, owing to being subject to the restriction of the factors such as composition, annealing quality, surface quality and mechanical performance, in actual production, single pass cold deformation control range is between 20-40%, can guarantee that drawing is not ruptured smoothly and in drawing process, pulled, reach the requirement of cold drawn production.
2) mould requirement
The mould inner surface quality requirement that cold-drawn hexagonal steel uses: without defects such as sand holes, scuffing, pit, ring-shaped grooves, carry out essence with emery grinding grease and throw, its surface smoothness reaches minute surface requirement.
The physical dimension of cold drawn mould:
Inlet angle 60 °, Lubricanting cone 36 °, Drawing cone 24 °, calibrating strap 3 ~ 5mm, go out prostomum 60 °;
The material of cold drawn mould: YG8;
Flatness≤the 0.01mm of hex surface.
3) drawing speed and the collection parameter that twists control
30CrMnSiA steel grade is cold drawn adopts drawing speed to control at 20 ~ 40m/min by the accurate hexagon steel of the cold drawn one-tenth of circle.Meanwhile, by the adjustment trunnion axis (X-axis) of mould and the angle of vertical axis (Y-axis), to keep after cold drawn hexaplanar upwards; Undertaken by de-distortion, cold drawing deformation, the collection that twists, coil external diameter at 1000 ~ 1200mm after bending, internal diameter exists: 800 ~ 1000mm, realizes the manufacturing technique requirent coiling the front road distortion of cold drawn finished product.
Five, cold drawn finished product forming processes is coiled
The cold drawn finished product of 30CrMnSiA is shaping is hexagonally coil by de-distortion, cold drawing deformation with standard, to twist or essence is rectified, sheared collection method and carry out final processing and forming and be produced into coiling of finished product or bar.
Main technique main points:
The cold drawn cold drawn accurate hexagon by the front road of finished product of 30CrMnSiA is special-shaped, and adopt middling speed drawing, drawing speed controls be no more than 20 ~ 40m/min.Meanwhile, by the adjustment trunnion axis (X-axis) of mould and the angle of vertical axis (Y-axis), the plane of hexagonal section after cold drawn is kept upwards;
To coil being undertaken by de-distortion, cold drawing deformation, the collection that twists of the supply of material, coil external diameter at 1000 ~ 1200mm after bending, internal diameter exists: 800 ~ 1000mm, meets the manufacturing technique requirent coiling rolling.
With bar production by de-distortion, cold drawing deformation, shearing scale, essence is rectified, collection method carries out final processing and forming.Shearing die installation specification is with finished product full-size+0.5mm, guarantees that end is smooth, without shearing impression; Finished product on-line straightening uses trunnion axis (X-axis) and vertical axis (Y-axis) two-way aligning, linearity≤1mm/m.
Utilize the work hardening that cold drawn rear 30CrMnSiA material cold working produces, suitable deflection reaches required hardness, and be conducive to the requirement of rigidity in the production of 30CrMnSiA structural alloy steel, HRB is: 259 ~ 269.
Produce 30CrMnSiA steel grade cold-drawn hexagonal steel example with steel production enterprise below, carry out concrete example explanation: chemical composition sees the following form the chemical composition of 1:30CrMnSiA steel
| Element | C | Si | Mn | Cr | Ni | Mo | Cu |
| Content % | 0.3 | 1.11 | 0.91 | 0.96 | 0.09 | 0.02 | 0.06 |
The 30CrMnSiA of above-mentioned Φ 8.0mm is coiled blank and carry out annealing in process (batch 12.3 tons, 710-720 DEG C is warmed up to stove, be incubated 5 hours, come out of the stove with cold 140 DEG C of stove control) → coil blemish process to Φ 7.8mm(feed speed 15 ~ 20m/min, cutterhead rotating speed controls at 2600 ~ 2700RPM, 1, 2, No. 3 polishing machine rotating speed≤240 ~ 250RPM) → (concentration is 15 ~ 20% degreasing agents to coil precoated shet lubricated, temperature controls 40 ~ 50 DEG C, 50 ~ 70 minutes time, upper D3-D35 film agent, total acidity (TA): 40, free acidity (FA): 6.0, temperature: 75 DEG C, dip time 8min, upper lubricant L S-2 liquid solubility 6%, temperature controls at 80 ~ 85 DEG C, dip time 4 ~ 5 minutes) → coil cold drawn finished product front road deformation process (be distance that 6.7mm(S refer to hexagonal steel opposite side by the cold drawn one-tenth of circular ф 7.8mm drawing speed 35m/min accurate hexagon steel S), coil external diameter at 1000 ~ 1200mm, internal diameter: 800-1000mm) → (cold drawn one-tenth hexagon steel S is 6.7mm to coil cold drawn finished product forming processes, finished product is coiled or bar S is 6.0mm, speed 30m/min).
Hexagon cold-drawn material performance after adopting this preparation method to be shaped is as follows:
1, hardness is: HRB265, decarburization: 0, meets hardness≤269HBW, the index of decarburized layer≤0.03mm;
2, the surface quality after cold drawing molding is without macroscopic defect (without pit, cut and pit etc.);
3, can cold drawn bar or coil form delivery.
In sum, the preparation method of 30CrMnSiA hexagon cold-drawn material of the present invention, its production process is smooth, be applicable to the needs produced in enormous quantities, and the hexagon cold-drawn material produced meets premium grade requirement completely, and ensure that qualification rate, considerable economic benefit can be brought to enterprise.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (6)
1. a preparation method for 30CrMnSiA hexagon cold-drawn material, is characterized in that,
Comprise the following steps:
A. adopt 30CrMnSiA hot rolling to coil as raw material, in the strong convection bell type furnace with nitrogen hydrogen protective atmosphere, carry out annealing in process, to recover plasticity;
B. blemish process is carried out to coiling after annealing;
C. off-line surface precoated shet lubricated is carried out to coiling;
D. will coil and carry out drawing deformation process on continuous drawing device, and form accurate hexagon and coil;
E. aligning hexagon is coiled and is carried out cold drawn finished product forming processes.
2. the preparation method of 30CrMnSiA hexagon cold-drawn material as claimed in claim 1, is characterized in that:
In step, the control overflow of described annealing in process is: be warmed up to 700-720 DEG C with stove, is incubated after 4 ~ 6 hours, is cooled to 140 DEG C or following temperature to come out of the stove.
3. the preparation method of 30CrMnSiA hexagon cold-drawn material as claimed in claim 1, is characterized in that:
In stepb, specifically comprise the following steps:
B1. uncoiling aligning, setting feed speed is 10 ~ 20m/min;
B2. cut, cutterhead rotating speed is controlled at 2600 ~ 3000RPM;
B3. abrasive band polishing, controls belt sander rotating speed≤230 ~ 250RPM;
B4. rolling, to obtain surface roughness≤0.8 μm, decarburized layer deepness≤0.03mm coils.
4. the preparation method of 30CrMnSiA hexagon cold-drawn material as claimed in claim 1, is characterized in that:
In step C, specifically comprise the following steps:
C1. degreasing, adopt concentration to be 15 ~ 20% degreasing agents, temperature controls at 40 ~ 50 DEG C, and the time is 50 ~ 70 minutes, to remove Liquid Residue during blemish process;
C2. rinse;
C3. epithelium film, adopt total acidity to be 35 ~ 40, free acidity is D3 ~ D35 film agent solution of 5.6 ~ 7.0, and dipping temperature is 65 ~ 85 DEG C, and dip time is 5 ~ 10min;
C4. rinse;
C5. go up lubricant, adopt solubility to be 5 ~ 7%, solution pH value is the LS-2 model lubricating fluid of 8 ~ 9, and dipping temperature is 75 ~ 85 DEG C, and dip time is 4 ~ 5 minutes;
C6. dry up.
5. the preparation method of 30CrMnSiA hexagon cold-drawn material as claimed in claim 1, is characterized in that:
In step D, specifically comprise the following steps:
D1. uncoiling and de-distortion is carried out to coiling;
D2. accurate hexagon is formed by drawing;
D2. the online hexagon that is as the criterion of collecting is coiled.
6. the preparation method of 30CrMnSiA hexagon cold-drawn material as claimed in claim 1, is characterized in that:
In step e, specifically comprise the following steps:
D1. aligning hexagon is coiled and is carried out de-distortion;
D2. be hexagon by cold drawing deformation;
D3. twist or essence rectify;
D4. shear and collect.
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| CN105714187A (en) * | 2016-04-11 | 2016-06-29 | 宝钢集团新疆八一钢铁有限公司 | Production method for 30CrMnSiA hot rolled steel strip |
| CN109013741A (en) * | 2018-10-17 | 2018-12-18 | 江门市鸿顺金属拉丝制品有限公司 | A kind of production technology of wire product |
| TWI679070B (en) * | 2019-04-09 | 2019-12-11 | 金允成企業股份有限公司 | Forging and drawing method for aluminum alloy pipe fittings |
| CN111672927A (en) * | 2020-05-28 | 2020-09-18 | 大冶特殊钢有限公司 | Method for manufacturing cold-drawn special steel round steel without decarburized layer on surface |
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| CN105714187A (en) * | 2016-04-11 | 2016-06-29 | 宝钢集团新疆八一钢铁有限公司 | Production method for 30CrMnSiA hot rolled steel strip |
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| CN111167993A (en) * | 2019-04-09 | 2020-05-19 | 金允成企业股份有限公司 | Forging and drawing forming method for aluminum alloy pipe fitting |
| CN111672927A (en) * | 2020-05-28 | 2020-09-18 | 大冶特殊钢有限公司 | Method for manufacturing cold-drawn special steel round steel without decarburized layer on surface |
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