CN104611632A - Wear-resistant and impact-resistant section bar for bracket beam and welding process thereof - Google Patents
Wear-resistant and impact-resistant section bar for bracket beam and welding process thereof Download PDFInfo
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- CN104611632A CN104611632A CN201510068906.1A CN201510068906A CN104611632A CN 104611632 A CN104611632 A CN 104611632A CN 201510068906 A CN201510068906 A CN 201510068906A CN 104611632 A CN104611632 A CN 104611632A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Materials Engineering (AREA)
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- Optics & Photonics (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a wear-resistant and impact-resistant section bar for a bracket beam. The section bar is prepared from a steel blank comprising the following chemical components in percentage by weight: 0.03-0.08% of C, 0.20-0.30% of Si, 0.20-0.46% of Mn, 0.85-1.0% of Cr, 0.16-0.22% of Mo, 0.015-0.030% of N, 0.05-2% of Cu, 0.02-0.10% of Ce, 0.02-0.10% of La, 0.04-0.05% of P, 0.03-0.04% of S, 0.01-0.25% of Nb, 0.18-0.36% of V, 4.8-5.9% of Al and the balance of Fe and impurities. The section bar is prepared by the following steps sequentially: feeding; electroplating; drawing; annealing; insulating; pickling; drying and putting in storage. The invention further designs a treatment process of the wear-resistant and impact-resistant section bar for the bracket beam. The welding flux selected is prepared from the following chemical components in percentage by weight: 0.03-0.07% of C, 0.15-0.45% of Si, 0.5-3.5% of Cr, 1.5-1.8% of Mn, 3.0-3.6% of Ni, 0.45-1.25% of Cr, 0.8-1.5% of Mo, 0.005-0.025% of Ti and the balance of Fe and inevitable impurities. According to the wear-resistant impact-resistant section bar for the bracket beam disclosed by the invention, the wear-resistant and impact-resistant capacities of the bracket beam are remarkably improved, and moreover, the process is simple to operate and energy-saving and environment-friendly.
Description
Technical field
The invention belongs to alloy profile and process field thereof, particularly a kind of wear resistant and impact resistant type bracket beam section bar and weldprocedure thereof.
Background technology
Current existing bracket beam section bar, owing to using common iron, after bend tension process, the material of crooked position is through extending, and thinner compared with other positions, crooked position is once occur breakage, and knockout pipe is often directly scrapped, cannot re-use, cause great waste; If bracket beam section bar two of thickening is welded on shelf respectively, due in conventional bonding technique, degenerate owing to welding the material property that causes, thus affect the original performance of weldment, or weld seam is due to welding stress or under other cause crisp factor acting in conjunction, crack and pore etc., in use procedure, easy breakage comes off, and produces high temperature and a large amount of obnoxious flavoures in welding process, neither energy-conservation also not environmentally, slightly carelessly will cause damage to staff, health risk.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of wear resistant and impact resistant type bracket beam section bar and weldprocedure thereof, can significantly improve the wear resistant and impact resistant ability of bracket beam section bar, and technological operation is simultaneously simple, energy-conserving and environment-protective.
In order to solve above technical problem, the invention provides a kind of wear resistant and impact resistant type bracket beam section bar, the weight percent chemical composition of selection steel blank is: C:0.03-0.08%, Si:0.20-0.30%, Mn:0.20-0.46%, Cr:0.85-1.0%, Mo:0.16-0.22%, N:0.015-0.030%, Cu:0.05%-2%, Ce:0.02-0.10%, La:0.02-0.10%, P:0.04-0.05%, S:0.03-0.04%, Nb:0.01-0.25%, V:0.18-0.36%, Al:4.8-5.9%, all the other are Fe and impurity, charging is comprised successively during shape extrusion, plating, drawing, annealing, insulation, pickling, dry and warehouse-in operation, wherein:
In electroplating work procedure, pre-metallization solution pH value is 1.0-1.8, and main plating liquor pH value is 0.5-1.2;
In drawing procedure, steel blank is placed in after process furnace is heated to 900-950 DEG C and carries out drawing, and immediately carry out carburizing treatment, the treatment time is 5-7 hour, after be cooled to 200-260 DEG C and be incubated, soaking time is 30-40 minute;
Annealing operation comprises the following steps: be incubated 1 hour after 1. section bar being heated to 400 DEG C, reheats to 600 DEG C of insulations 1 hour, is finally heated to 800 DEG C; 2. start annealing operation after water-cooled section bar to 600 DEG C, annealing process is noted keeping furnace pressure 0.3 MPa;
In insulation operation, adopt twice refrigerating work procedure that section bar is cooled to 200-250 DEG C, and be incubated 2.5-3.5 hour;
First refrigerating work procedure: adopt oil cooling with the rate of cooling of 15-17 DEG C/s by section bar water-cooled to 380-400 DEG C;
Second refrigerating work procedure: adopt water-cooled with the rate of cooling of 3-5 DEG C/s by section bar water-cooled to 200-250 DEG C;
When cooling, if use water-cooled merely, in water, cooling stress is large, the easy strain cracking of workpiece; Alone oil cooling, then speed of cooling is slow, and through hardening diameter is little, and workpiece is through hardening not easily; The present invention adopts the method for first oil cooling, rear water-cooled, and not only ensure that there are enough speed of cooling in workpiece heart portion, and it is excessive to avoid speed of cooling, causes inside workpiece to cause workpiece deformation or cracking due to the uneven internal stress that causes of expanding with heat and contract with cold;
Technique effect: it is lower that the steel blank that the present invention selects belongs to carbon content, both the low strength hardness of soft steel and low wear resistance had not been had, also poor unlike high carbon steel thermohardening, hardening capacity is low, C content is within the scope of 0.03-0.08%, both ensure that steel had certain snappiness, also the yield-point of steel and tensile strength is made to raise, meet certain hardness and wear resistance, there is good comprehensive mechanical property, the maximum hardness that can reach is about HRC55 (HB538), and σ b is 550-850MPa;
Mn content is 0.20-0.46%, Mn too high levels, then make steel blank fragility strengthen, become frangible, the manganese of appropriate content has good deoxidizing capacity, the FeO in steel can be reduced into iron, improve the quality of steel; MnS can also be formed with sulphur, thus alleviate the deleterious effect of sulphur; The fragility of steel can be reduced simultaneously, improve the hot workability of steel; Manganese energy major part is dissolved in ferrite, forms substitutional solid solution, ferrite is strengthened, then improves intensity and the hardness of steel.
The technical scheme that the present invention limits further is:
Further, aforesaid wear resistant and impact resistant type bracket beam section bar, the weight percent chemical composition of steel blank is: C:0.04%, Si:0.24%, Mn:0.30%, Cr:0.90%, Mo:0.18%, N:0.022%, Cu:0.10%, Ce:0.06%, La:0.06%, P:0.04%, S:0.03%, Nb:0.25%, V:0.24%, Al:5.1%, all the other are Fe and impurity.
Aforesaid wear resistant and impact resistant type bracket beam section bar, the weight percent chemical composition of steel blank is: C:0.05%, Si:0.25%, Mn:0.40%, Cr:0.90%, Mo:0.30%, N:0.020%, Cu:0.15%, Ce:0.08%, La:0.08%, P:0.05%, S:0.03%, Nb:0.15%, V:0.25%, Al:5.2%, all the other are Fe and impurity.
Aforesaid wear resistant and impact resistant type bracket beam section bar, in electroplating work procedure, pre-metallization solution pH value is 1.6, and main plating liquor pH value is 0.8;
In drawing procedure, steel blank is placed in after process furnace is heated to 920 DEG C and carries out drawing, and immediately carry out carburizing treatment, the treatment time is 6 hours, after be cooled to 240 DEG C and be incubated, soaking time is 35 minutes.
The present invention have also been devised a kind of welding process of wear resistant and impact resistant type bracket beam section bar, the weight percent chemical composition of solder is selected to be: C:0.03-0.07%, Si:0.15-0.45%, Sb:0.5-3.5%, Mn:1.5-1.8%, Ni:3.0-3.6%, Cr:0.45-1.25%, Mo:0.8-1.5%, Ti:0.005-0.025%, all the other are Fe and inevitable impurity;
In the solder selected, the content of Sb is 0.5-3.5%, not only can the tissue of refinement welding flux alloy, reduce fusing point, improve intensity and the wettability of solder, Sb content can be avoided excessive and cause the fragility of solder to increase simultaneously, affecting the reliability of machining property and solder joint; Ni content is 3.0-3.6%, also too much can not increase the fragility of solder, prevent the formation of crackle while improving mobility; Mo content is 0.8-1.5%, and molybdenum preferentially forms carbide in sintering, and direct effect is dispersion-strengthened, improves the intensity of sintered part, hardness and wear resistance, improves stability, reduces fragility;
Wherein:
First carry out thermal pretreatment to it before welding, preheating temperature is 100-200 DEG C; After having welded, slowly heating bracket beam section bar is incubated to 450-550 DEG C, and soaking time T calculates according to section bar thickness d, and concrete formula is T=d/35, and wherein, the unit of soaking time T is hour, and the unit of d is millimeter, final vacuum slow cooling to room temperature.
The welding process of aforesaid wear resistant and impact resistant type bracket beam section bar, the weight percent chemical composition of solder is selected to be: C:0.06%, Si:0.35%, Sb:2.8%, Mn:1.6%, Ni:3.4%, Cr:0.85%, Mo:1.25%, Ti:0.015%, all the other are Fe and inevitable impurity, wherein:
First carry out thermal pretreatment to it before welding, preheating temperature is 160 DEG C; After having welded, slowly heating bracket beam section bar to 480 DEG C being incubated, soaking time T calculates according to section bar thickness d, and concrete formula is T=d/35, and wherein, the unit of soaking time T is hour, and the unit of d is millimeter, final vacuum slow cooling to room temperature;
According to thickness of workpiece, control heat treated soaking time, remove while welding stress, not only reduce the probability welding the material property that causes and degenerate, and avoid to a great extent cracking and the problem such as pore, make weld more firm.
Embodiment
embodiment 1
A kind of wear resistant and impact resistant type bracket beam section bar that the present embodiment provides, the weight percent chemical composition of selection steel blank is: C:0.04%, Si:0.24%, Mn:0.30%, Cr:0.90%, Mo:0.18%, N:0.022%, Cu:0.10%, Ce:0.06%, La:0.06%, P:0.04%, S:0.03%, Nb:0.25%, V:0.24%, Al:5.1%, all the other are Fe and impurity, charging, plating, drawing, annealing, insulation, pickling, oven dry and warehouse-in operation is comprised successively during shape extrusion, wherein:
In electroplating work procedure, pre-metallization solution pH value is 1.5, and main plating liquor pH value is 0.8;
In drawing procedure, steel blank is placed in after process furnace is heated to 920 DEG C and carries out drawing, and immediately carry out carburizing treatment, the treatment time is 5 hours, after be cooled to 240 DEG C and be incubated, soaking time is 35 minutes;
Annealing operation comprises the following steps: be incubated 1 hour after 1. section bar being heated to 400 DEG C, reheats to 600 DEG C of insulations 1 hour, is finally heated to 800 DEG C; 2. start annealing operation after water-cooled section bar to 600 DEG C, annealing process is noted keeping furnace pressure 0.3 MPa;
In insulation operation, adopt twice refrigerating work procedure that section bar is cooled to 220 DEG C, and be incubated 2.8 hours;
First refrigerating work procedure: adopt oil cooling with the rate of cooling of 15 DEG C/s by section bar water-cooled to 380 DEG C;
Second refrigerating work procedure: adopt water-cooled with the rate of cooling of 3 DEG C/s by section bar water-cooled to 200 DEG C;
In electroplating work procedure, pre-metallization solution pH value is 1.6, and main plating liquor pH value is 0.8;
In drawing procedure, steel blank is placed in after process furnace is heated to 920 DEG C and carries out drawing, and immediately carry out carburizing treatment, the treatment time is 6 hours, after be cooled to 240 DEG C and be incubated, soaking time is 35 minutes.
The present embodiment additionally provides a kind of welding process of wear resistant and impact resistant type bracket beam section bar, the weight percent chemical composition of solder is selected to be: C:07%, Si:0.30%, Sb:2.7%, Mn:1.6%, Ni:3.2%, Cr:0.85%, Mo:1.2%, Ti:0.010%, all the other are Fe and inevitable impurity;
First carry out thermal pretreatment to it before welding, preheating temperature is 160 DEG C; After having welded, slowly heating bracket beam section bar to 480 DEG C being incubated, soaking time T calculates according to section bar thickness d, and concrete formula is T=d/35, and wherein, the unit of soaking time T is hour, and the unit of d is millimeter, final vacuum slow cooling to room temperature.
embodiment 1
A kind of wear resistant and impact resistant type bracket beam section bar that the present embodiment provides, the weight percent chemical composition of selection steel blank is: C:0.05%, Si:0.25%, Mn:0.40%, Cr:0.90%, Mo:0.30%, N:0.020%, Cu:0.15%, Ce:0.08%, La:0.08%, P:0.05%, S:0.03%, Nb:0.15%, V:0.25%, Al:5.2%, all the other are Fe and impurity, charging, plating, drawing, annealing, insulation, pickling, oven dry and warehouse-in operation is comprised successively during shape extrusion, wherein:
In electroplating work procedure, pre-metallization solution pH value is 1.0-1.8, and main plating liquor pH value is 0.5-1.2;
In drawing procedure, steel blank is placed in after process furnace is heated to 940 DEG C and carries out drawing, and immediately carry out carburizing treatment, the treatment time is 6 hours, after be cooled to 240 DEG C and be incubated, soaking time is 30-40 minute;
Annealing operation comprises the following steps: be incubated 1 hour after 1. section bar being heated to 400 DEG C, reheats to 600 DEG C of insulations 1 hour, is finally heated to 800 DEG C; 2. start annealing operation after water-cooled section bar to 600 DEG C, annealing process is noted keeping furnace pressure 0.3 MPa;
In insulation operation, adopt twice refrigerating work procedure that section bar is cooled to 240 DEG C, and be incubated 3.2 hours;
First refrigerating work procedure: adopt oil cooling with the rate of cooling of 16 DEG C/s by section bar water-cooled to 390 DEG C;
Second refrigerating work procedure: adopt water-cooled with the rate of cooling of 4 DEG C/s by section bar water-cooled to 240 DEG C;
The present embodiment have also been devised a kind of welding process of wear resistant and impact resistant type bracket beam section bar, the weight percent chemical composition of solder is selected to be: C:0.06%, Si:0.35%, Sb:2.8%, Mn:1.6%, Ni:3.4%, Cr:0.85%, Mo:1.25%, Ti:0.015%,, all the other are Fe and inevitable impurity;
First carry out thermal pretreatment to it before welding, preheating temperature is 180 DEG C; After having welded, slowly heating bracket beam section bar to 520 DEG C being incubated, soaking time T calculates according to section bar thickness d, and concrete formula is T=d/35, and wherein, the unit of soaking time T is hour, and the unit of d is millimeter, final vacuum slow cooling to room temperature.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (6)
1. a wear resistant and impact resistant type bracket beam section bar, it is characterized in that, the weight percent chemical composition of selection steel blank is: C:0.03-0.08%, Si:0.20-0.30%, Mn:0.20-0.46%, Cr:0.85-1.0%, Mo:0.16-0.22%, N:0.015-0.030%, Cu:0.05%-2%, Ce:0.02-0.10%, La:0.02-0.10%, P:0.04-0.05%, S:0.03-0.04%, Nb:0.01-0.25%, V:0.18-0.36%, Al:4.8-5.9%, all the other are Fe and impurity, charging is comprised successively during shape extrusion, plating, drawing, annealing, insulation, pickling, dry and warehouse-in operation, wherein:
In described electroplating work procedure, pre-metallization solution pH value is 1.0-1.8, and main plating liquor pH value is 0.5-1.2;
In described drawing procedure, steel blank is placed in after process furnace is heated to 900-950 DEG C and carries out drawing, and immediately carry out carburizing treatment, the treatment time is 5-7 hour, after be cooled to 200-260 DEG C and be incubated, soaking time is 30-40 minute;
Described annealing operation comprises the following steps: be incubated 1 hour after 1. described section bar being heated to 400 DEG C, reheats to 600 DEG C of insulations 1 hour, is finally heated to 800 DEG C; 2. start annealing operation after section bar to 600 described in water-cooled DEG C, annealing process is noted keeping furnace pressure 0.3 MPa;
In described insulation operation, adopt twice refrigerating work procedure that described section bar is cooled to 200-250 DEG C, and be incubated 2.5-3.5 hour;
Described first refrigerating work procedure: adopt oil cooling with the rate of cooling of 15-17 DEG C/s by described section bar water-cooled to 380-400 DEG C;
Described second refrigerating work procedure: adopt water-cooled with the rate of cooling of 3-5 DEG C/s by described section bar water-cooled to 200-250 DEG C.
2. wear resistant and impact resistant type bracket beam section bar according to claim 1, it is characterized in that, the weight percent chemical composition of described steel blank is: C:0.04%, Si:0.24%, Mn:0.30%, Cr:0.90%, Mo:0.18%, N:0.022%, Cu:0.10%, Ce:0.06%, La:0.06%, P:0.04%, S:0.03%, Nb:0.25%, V:0.24%, Al:5.1%, all the other are Fe and impurity.
3. wear resistant and impact resistant type bracket beam section bar according to claim 1, it is characterized in that, the weight percent chemical composition of described steel blank is: C:0.05%, Si:0.25%, Mn:0.40%, Cr:0.90%, Mo:0.30%, N:0.020%, Cu:0.15%, Ce:0.08%, La:0.08%, P:0.05%, S:0.03%, Nb:0.15%, V:0.25%, Al:5.2%, all the other are Fe and impurity.
4. wear resistant and impact resistant type bracket beam section bar according to claim 1, is characterized in that, in described electroplating work procedure, pre-metallization solution pH value is 1.6, and main plating liquor pH value is 0.8;
In described drawing procedure, steel blank is placed in after process furnace is heated to 920 DEG C and carries out drawing, and immediately carry out carburizing treatment, the treatment time is 6 hours, after be cooled to 240 DEG C and be incubated, soaking time is 35 minutes.
5. according to the welding process of the wear resistant and impact resistant type bracket beam section bar in Claims 1-4 described in any one claim, it is characterized in that, the weight percent chemical composition of solder is selected to be: C:0.03-0.07%, Si:0.15-0.45%, Sb:0.5-3.5%, Mn:1.5-1.8%, Ni:3.0-3.6%, Cr:0.45-1.25%, Mo:0.8-1.5%, Ti:0.005-0.025%, all the other are Fe and inevitable impurity, wherein:
First carry out thermal pretreatment to it before welding, preheating temperature is 100-200 DEG C; After having welded, slowly heating bracket beam section bar is incubated to 450-550 DEG C, and soaking time T calculates according to section bar thickness d, and concrete formula is T=d/35, and wherein, the unit of soaking time T is hour, and the unit of d is millimeter, final vacuum slow cooling to room temperature.
6. the welding process of wear resistant and impact resistant type bracket beam section bar according to claim 5, it is characterized in that, the weight percent chemical composition of solder is selected to be: C:0.06%, Si:0.35%, Sb:2.8%, Mn:1.6%, Ni:3.4%, Cr:0.85%, Mo:1.25%, Ti:0.015%, all the other are Fe and inevitable impurity, wherein:
First carry out thermal pretreatment to it before welding, preheating temperature is 160 DEG C; After having welded, slowly heating bracket beam section bar to 480 DEG C being incubated, soaking time T calculates according to section bar thickness d, and concrete formula is T=d/35, and wherein, the unit of soaking time T is hour, and the unit of d is millimeter, final vacuum slow cooling to room temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107236903A (en) * | 2017-06-28 | 2017-10-10 | 安徽华飞机械铸锻有限公司 | A kind of casting technique of alloy steel casting |
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