CN113564516A - Simplified heat treatment process for container corner fittings - Google Patents
Simplified heat treatment process for container corner fittings Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000008569 process Effects 0.000 title claims abstract description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005256 carbonitriding Methods 0.000 claims abstract description 22
- 238000005255 carburizing Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000004321 preservation Methods 0.000 abstract description 3
- 238000010791 quenching Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 7
- 238000005496 tempering Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003818 cinder Substances 0.000 description 2
- 239000012611 container material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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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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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention relates to a simplified heat treatment process for container corner fittings, which comprises the following steps: s1: carbonitriding, namely cleaning container corner pieces, then placing the container corner pieces into a carburizing furnace, controlling the temperature of the carburizing furnace at 800-840 ℃, introducing a nitrogen supply agent into the furnace, wherein the nitrogen supply agent accounts for 38% of the volume of furnace gas, and the heat preservation time is 150-200min, and discharging the workpiece out of the furnace for cooling after carbonitriding treatment; s2: normalizing at 910-. The heat treatment process can completely replace the traditional heat treatment process of the container corner fittings, simplify the heat treatment process, reduce the production cost, improve the production efficiency and create great economic benefits for enterprises.
Description
Technical Field
The invention relates to the technical field of container materials, in particular to a simplified heat treatment process for a container corner fitting.
Background
The container corner fittings, as the most important stressed parts on the container, must bear the change from the hot equator to the cold regions of the polar region, not only can bear the static pressure of 7 layers of piles, but also can bear the randomly changed load generated by the bumpiness and binding of the marine storm and the impact and tensile load during hoisting, the service condition is bad, the performance requirement is higher, and once the container is broken at sea or during hoisting, the consequences are unreasonable. Therefore, each ship inspection mechanism sets strict inspection standards for the product. The container corner fittings are usually low-carbon low-alloy steel castings, and in order to meet the performance requirements of the inspection standard, the container corner fittings need to be subjected to heat treatment.
In the prior art, however, as disclosed in chinese patent No. CN110055470B, a container corner fitting is disclosed, which belongs to the field of container materials, and the alloy components constituting the container corner fitting are composed of the following elements in percentage by mass: 0.09-0.15% of C, 0.95-1.40% of Mn, 0.27-0.36% of Si, 0.19-0.26% of Ni, 0.15-0.22% of Cr, 0.007-0.015% of Al, at most 0.03% of P, at most 0.03% of S, at most 0.08% of Mo, at most 0.17% of Cu, at most 0.01% of V, and the balance of Fe and inevitable impurities. Wherein Ni/Cr is 1.00-1.25; Mn/Si is 3.0-3.8; the mass percentage of Ni + Cr + Mo + Cu is less than or equal to 0.72 percent.
The heat treatment process of the container corner fitting comprises the following steps:
firstly, carburizing: carburizing at 920-940 ℃, allowing carburizing time to be 220-240 min, and air cooling after carburizing;
secondly, quenching: heating the container corner piece subjected to carburization and air cooling to 890-910 ℃, and then quenching, wherein the quenching step is step quenching, quenching is carried out in an alkaline bath furnace at the temperature of 370 ℃ for heat preservation, the container corner piece is taken out from the alkaline bath furnace after the internal temperature and the external temperature are uniform, and air cooling is carried out to the room temperature;
thirdly, tempering: the tempering temperature is 200-230 ℃, the tempering heat preservation time is 60-80 min, and air cooling is carried out after tempering.
The above prior art solutions have the following drawbacks: although the process improves the performance of the angle piece material and can meet the corresponding mechanical requirements, the process has more steps, low production efficiency, high energy consumption and high production cost. And after heat treatment, the oxide skin is relatively serious and is difficult to clean. Therefore, on the premise of meeting the mechanical property requirement of the container corner fitting, the simplified heat treatment process of the container corner fitting needs to be researched and developed urgently, the production cost is reduced, the production efficiency is improved, and great economic benefits are created for enterprises.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a simplified heat treatment process for container corner fittings, which can completely replace the traditional heat treatment process for container corner fittings, simplify the heat treatment process, reduce the production cost, improve the production efficiency and create great economic benefits for enterprises.
The above object of the present invention is achieved by the following technical solutions:
a simplified heat treatment process for corner fittings of a container comprises the following steps:
s1: carbonitriding, namely cleaning container corner pieces, then placing the container corner pieces into a carburizing furnace, controlling the temperature of the carburizing furnace at 800-840 ℃, introducing a nitrogen supply agent into the furnace, wherein the nitrogen supply agent accounts for 38% of the volume of furnace gas, keeping the temperature for 200min, and discharging the workpiece out of the furnace for cooling after carbonitriding treatment;
s2: normalizing at 910-.
The present invention in a preferred example may be further configured to: in step S1, the carburizing furnace temperature is controlled at 820 ℃, and the holding time is 175 min.
The present invention in a preferred example may be further configured to: in the step S2, the normalizing temperature is 945 ℃, and the normalizing time is 70 min.
The present invention in a preferred example may be further configured to: in the step S2, the normalizing temperature is 960 ℃, and the normalizing time is 65 min.
The present invention in a preferred example may be further configured to: in step S2, the normalizing temperature is 930 ℃ and the normalizing time is 75 min.
Through the technical scheme.
The present invention in a preferred example may be further configured to: the alloy components of the container corner fitting are composed of the following elements in percentage by mass: 0.12-0.15% of C, 1.11-1.35% of Mn, 0.36-0.40% of Si, 0.27-0.34% of Ni, 0.13-0.18% of Cr, 0.007-0.015% of Al, at most 0.008% of P, at most 0.012% of S, at most 0.04% of Mo, at most 0.17% of B, at most 0.01% of Ti, at most 0.013% of W, and the balance of Fe and inevitable impurities.
The present invention in a preferred example may be further configured to: the alloy components for forming the corner fittings of the container are composed of the following elements in percentage by mass: 0.123% of C, 1.23% of Mn, 0.37% of Si, 0.29% of Ni, 0.16% of Cr, 0.012% of Al, 0.007% of P, 0.001% of S, 0.03% of Mo, 0.15% of B, 0.008% of Ti, 0.011% of W, and the balance of Fe and inevitable impurities.
The present invention in a preferred example may be further configured to: the alloy components for forming the corner fittings of the container are composed of the following elements in percentage by mass: 0.138% of C, 1.26% of Mn, 0.38% of Si, 0.31% of Ni, 0.15% of Cr, 0.011% of Al, 0.006% of P, 0.012% of S, 0.04% of Mo, 0.16% of B, 0.008% of Ti, 0.010% of W, and the balance of Fe and inevitable impurities.
In summary, the invention includes at least one of the following beneficial technical effects:
the invention adopts the processing technology of one-time carbonitriding and one-time normalizing, and adds a carbonitriding layer with hardness between the high-hardness surface layer and the low-hardness matrix of the carbonitriding of the container corner fitting, thereby obviously relieving the hardness gradient from the high-hardness surface layer to the low-hardness matrix and effectively avoiding the scale cinder from peeling off after heat treatment.
The container corner fitting produced by the heat treatment process not only can be suitable for worse working conditions, but also can prolong the service life of a workpiece, so that the structure and the performance of a carbonitriding layer are improved to a certain extent. The process can completely replace the traditional heat treatment process of the container corner fittings, simplifies the heat treatment process, reduces the production cost, improves the production efficiency and can create great economic benefits for enterprises.
The mechanical property which is not much different from quenching and high-temperature tempering can be obtained by adopting one-time normalizing treatment, the formation of coarse polygonal ferrite is inhibited by the faster cooling speed during normalizing, the structure is refined, the strength and the toughness of steel are improved, the utilization rate of equipment is improved by the normalizing treatment, and the normalizing treatment is effective and cheap for alloy steel of container corner fittings. The yield strength Rp of a sample is more than 300MPa, the tensile strength Rm of the sample is more than 500MPa, the elongation A of the sample after fracture is more than 30%, the reduction of area Z is more than 50%, and the impact energy Ax of minus 40 ℃ is more than 50J, and all indexes meet the requirements of classification society.
Drawings
FIG. 1 is a simplified heat treatment process flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
referring to fig. 1, the simplified heat treatment process for the corner fittings of the container disclosed by the invention comprises the following steps:
s1: carbonitriding, namely cleaning container corner parts, then loading the container corner parts into a carburizing furnace, controlling the temperature of the carburizing furnace at 820 ℃, introducing a nitrogen supply agent into the furnace, wherein the nitrogen supply agent accounts for 38% of the volume of furnace gas, keeping the temperature for 175min, and discharging the workpieces from the furnace for cooling after carbonitriding treatment;
s2: normalizing at 945 deg.C for 70min, and air cooling.
The alloy components of the container corner fitting are composed of the following elements in percentage by mass: 0.12-0.15% of C, 1.11-1.35% of Mn, 0.36-0.40% of Si, 0.27-0.34% of Ni, 0.13-0.18% of Cr, 0.007-0.015% of Al, at most 0.008% of P, at most 0.012% of S, at most 0.04% of Mo, at most 0.17% of B, at most 0.01% of Ti, at most 0.013% of W, and the balance of Fe and inevitable impurities.
Specifically, the present embodiment comprises the following elements: 0.123% of C, 1.23% of Mn, 0.37% of Si, 0.29% of Ni, 0.16% of Cr, 0.012% of Al, 0.007% of P, 0.001% of S, 0.03% of Mo, 0.15% of B, 0.008% of Ti, 0.011% of W, and the balance of Fe and inevitable impurities. Wherein, Ni/Cr is 1.81, Mn/Si is 3.32.
Carrying out performance detection on the simplified heat-treated test block, wherein the surface hardness of the container corner fitting is 63HRC, and the yield strength is 510 MPa; the tensile strength is 690 MPa; the low-temperature impact energy at-40 ℃ is 55J.
Example 2:
referring to fig. 1, the simplified heat treatment process for the corner fittings of the container disclosed by the invention comprises the following steps:
s1: carbonitriding, namely cleaning container corner parts, then loading the container corner parts into a carburizing furnace, controlling the temperature of the carburizing furnace at 820 ℃, introducing a nitrogen supply agent into the furnace, wherein the nitrogen supply agent accounts for 38% of the volume of furnace gas, keeping the temperature for 175min, and discharging the workpieces from the furnace for cooling after carbonitriding treatment;
s2: normalizing at 960 deg.C for 65min, and air cooling.
The alloy components of the container corner fitting are composed of the following elements in percentage by mass: 0.12-0.15% of C, 1.11-1.35% of Mn, 0.36-0.40% of Si, 0.27-0.34% of Ni, 0.13-0.18% of Cr, 0.007-0.015% of Al, at most 0.008% of P, at most 0.012% of S, at most 0.04% of Mo, at most 0.17% of B, at most 0.01% of Ti, at most 0.013% of W, and the balance of Fe and inevitable impurities.
Specifically, the present embodiment comprises the following elements: 0.138% of C, 1.26% of Mn, 0.38% of Si, 0.31% of Ni, 0.15% of Cr, 0.011% of Al, 0.006% of P, 0.012% of S, 0.04% of Mo, 0.16% of B, 0.008% of Ti, 0.010% of W, and the balance of Fe and inevitable impurities. Wherein, Ni/Cr is 2.07, Mn/Si is 3.31.
Performing performance detection on the simplified heat-treated test block, wherein the surface hardness of the corner fitting of the container is 60HRC, and the yield strength is 513 MPa; the tensile strength is 686 MPa; the low-temperature impact energy at-40 ℃ is 53J.
Example 3:
referring to fig. 1, the simplified heat treatment process for the corner fittings of the container disclosed by the invention comprises the following steps:
s1: carbonitriding, namely cleaning container corner pieces, then putting the container corner pieces into a carburizing furnace, controlling the temperature of the carburizing furnace at 800 ℃, introducing a nitrogen supplying agent into the furnace, wherein the nitrogen supplying agent accounts for 38% of the volume of furnace gas, keeping the temperature for 200min, and discharging the workpieces from the furnace for cooling after carbonitriding treatment;
s2: normalizing at 930 deg.C for 75min, and air cooling.
The alloy components of the container corner fitting are composed of the following elements in percentage by mass: 0.12-0.15% of C, 1.11-1.35% of Mn, 0.36-0.40% of Si, 0.27-0.34% of Ni, 0.13-0.18% of Cr, 0.007-0.015% of Al, at most 0.008% of P, at most 0.012% of S, at most 0.04% of Mo, at most 0.17% of B, at most 0.01% of Ti, at most 0.013% of W, and the balance of Fe and inevitable impurities.
Specifically, the present embodiment comprises the following elements: 0.12% of C, 1.11% of Mn, 0.36% of Si, 0.27% of Ni, 0.13% of Cr, 0.015% of Al, 0.006% of P, 0.012% of S, 0.04% of Mo, 0.16% of B, 0.008% of Ti, 0.010% of W, and the balance of Fe and inevitable impurities. Wherein, Ni/Cr is 2.08, Mn/Si is 3.08.
Carrying out performance detection on the simplified heat-treated test block, wherein the surface hardness of the container corner fitting is 62HRC, and the yield strength is 515 MPa; tensile strength of 692 MPa; the low-temperature impact energy at-40 ℃ is 54J.
Example 4:
referring to fig. 1, the simplified heat treatment process for the corner fittings of the container disclosed by the invention comprises the following steps:
s1: carbonitriding, namely cleaning container corner pieces, then putting the container corner pieces into a carburizing furnace, controlling the temperature of the carburizing furnace at 840 ℃, introducing a nitrogen supplying agent into the furnace, wherein the nitrogen supplying agent accounts for 38% of the volume of furnace gas, keeping the temperature for 150min, and discharging the workpieces from the furnace for cooling after carbonitriding treatment;
s2: normalizing at 945 deg.C for 70min, and air cooling.
The alloy components of the container corner fitting are composed of the following elements in percentage by mass: 0.12-0.15% of C, 1.11-1.35% of Mn, 0.36-0.40% of Si, 0.27-0.34% of Ni, 0.13-0.18% of Cr, 0.007-0.015% of Al, at most 0.008% of P, at most 0.012% of S, at most 0.04% of Mo, at most 0.17% of B, at most 0.01% of Ti, at most 0.013% of W, and the balance of Fe and inevitable impurities.
Specifically, the present embodiment comprises the following elements: 0.123% of C, 1.23% of Mn, 0.37% of Si, 0.29% of Ni, 0.16% of Cr, 0.012% of Al, 0.007% of P, 0.001% of S, 0.03% of Mo, 0.15% of B, 0.008% of Ti, 0.011% of W, and the balance of Fe and inevitable impurities. Wherein, Ni/Cr is 1.81, Mn/Si is 3.32.
Carrying out performance detection on the simplified heat-treated test block, wherein the surface hardness of the container corner fitting is 65HRC, and the yield strength is 512 MPa; the tensile strength is 695 MPa; the low-temperature impact energy at-40 ℃ is 57J.
In summary, the performance of the angle steel made of different components measured after heat treatment is compared, and when the alloy components forming the container corner fitting are composed of the following elements in percentage by mass: the container corner fitting has the advantages that the container corner fitting can obtain the best performance due to the facts that 0.123% of C, 1.23% of Mn, 0.37% of Si, 0.29% of Ni, 0.16% of Cr, 0.012% of Al, 0.007% of P, 0.001% of S, 0.03% of Mo, 0.15% of B, 0.008% of Ti and 0.011% of W and the balance of Fe and inevitable impurities, the normalizing temperature is 945 ℃ and the normalizing time is 70min, and the container corner fitting is the preferred scheme.
The implementation principle of the embodiment is as follows: the invention adopts the processing technology of one-time carbonitriding and one-time normalizing, and adds a carbonitriding layer with hardness between the high-hardness surface layer and the low-hardness matrix of the carbonitriding of the container corner fitting, thereby obviously relieving the hardness gradient from the high-hardness surface layer to the low-hardness matrix and effectively avoiding the scale cinder from peeling off after heat treatment.
The container corner fitting produced by the heat treatment process not only can be suitable for worse working conditions, but also can prolong the service life of a workpiece, so that the structure and the performance of a carbonitriding layer are improved to a certain extent. The process can completely replace the traditional heat treatment process of the container corner fittings, simplifies the heat treatment process, reduces the production cost, improves the production efficiency and can create great economic benefits for enterprises.
The mechanical property which is not much different from quenching and high-temperature tempering can be obtained by adopting one-time normalizing treatment, the formation of coarse polygonal ferrite is inhibited by the faster cooling speed during normalizing, the structure is refined, the strength and the toughness of steel are improved, the utilization rate of equipment is improved by the normalizing treatment, and the normalizing treatment is effective and cheap for alloy steel of container corner fittings. The yield strength Rp of a sample is more than 300MPa, the tensile strength Rm of the sample is more than 500MPa, the elongation A of the sample after fracture is more than 30%, the reduction of area Z is more than 50%, and the impact energy Ax of minus 40 ℃ is more than 50J, and all indexes meet the requirements of classification society.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A simplified heat treatment process for container corner fittings is characterized in that: the method comprises the following steps:
s1: carbonitriding, namely cleaning container corner pieces, then placing the container corner pieces into a carburizing furnace, controlling the temperature of the carburizing furnace at 800-840 ℃, introducing a nitrogen supply agent into the furnace, wherein the nitrogen supply agent accounts for 38% of the volume of furnace gas, keeping the temperature for 200min, and discharging the workpiece out of the furnace for cooling after carbonitriding treatment;
s2: normalizing at 910-.
2. The simplified heat treatment process for the corner fittings of the container as claimed in claim 1, wherein: in step S1, the carburizing furnace temperature is controlled at 820 ℃, and the holding time is 175 min.
3. The simplified heat treatment process for the corner fittings of the container as claimed in claim 1, wherein: in the step S2, the normalizing temperature is 945 ℃, and the normalizing time is 70 min.
4. The simplified heat treatment process for the corner fittings of the container as claimed in claim 1, wherein: in the step S2, the normalizing temperature is 960 ℃, and the normalizing time is 65 min.
5. The simplified heat treatment process for the corner fittings of the container as claimed in claim 1, wherein: in step S2, the normalizing temperature is 930 ℃ and the normalizing time is 75 min.
6. The simplified heat treatment process for the corner fittings of the container as claimed in claim 1, wherein: the alloy components of the container corner fitting are composed of the following elements in percentage by mass: 0.12-0.15% of C, 1.11-1.35% of Mn, 0.36-0.40% of Si, 0.27-0.34% of Ni, 0.13-0.18% of Cr, 0.007-0.015% of Al, at most 0.008% of P, at most 0.012% of S, at most 0.04% of Mo, at most 0.17% of B, at most 0.01% of Ti, at most 0.013% of W, and the balance of Fe and inevitable impurities.
7. The simplified heat treatment process for the corner fittings of the container as claimed in claim 6, wherein: the alloy components for forming the corner fittings of the container are composed of the following elements in percentage by mass: 0.123% of C, 1.23% of Mn, 0.37% of Si, 0.29% of Ni, 0.16% of Cr, 0.012% of Al, 0.007% of P, 0.001% of S, 0.03% of Mo, 0.15% of B, 0.008% of Ti, 0.011% of W, and the balance of Fe and inevitable impurities.
8. The simplified heat treatment process for the corner fittings of the container as claimed in claim 6, wherein: the alloy components for forming the corner fittings of the container are composed of the following elements in percentage by mass: 0.138% of C, 1.26% of Mn, 0.38% of Si, 0.31% of Ni, 0.15% of Cr, 0.011% of Al, 0.006% of P, 0.012% of S, 0.04% of Mo, 0.16% of B, 0.008% of Ti, 0.010% of W, and the balance of Fe and inevitable impurities.
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