WO2009107282A1 - 破断分離性及び被削性に優れた熱間鍛造用非調質鋼及び熱間圧延鋼材、並びに熱間鍛造非調質鋼部品 - Google Patents
破断分離性及び被削性に優れた熱間鍛造用非調質鋼及び熱間圧延鋼材、並びに熱間鍛造非調質鋼部品 Download PDFInfo
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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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/001—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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/12—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/121—Use of special materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/02—Constructions of connecting-rods with constant length
- F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
- F16C9/04—Connecting-rod bearings; Attachments thereof
- F16C9/045—Connecting-rod bearings; Attachments thereof the bearing cap of the connecting rod being split by fracturing
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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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- 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
- C21D2211/009—Pearlite
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2204/00—Metallic materials; Alloys
- F16C2204/60—Ferrous alloys, e.g. steel alloys
- F16C2204/64—Medium carbon steel, i.e. carbon content from 0.4 to 0,8 wt%
Definitions
- Non-heat treated and hot-rolled steel for hot forging with excellent fracture separation and machinability, and hot-forged non-heat treated steel parts Technical Field
- the present invention relates to a non-heat treated steel for hot forging and hot-rolled steel excellent in fracture separability and machinability, and a hot-forged non-heat treated steel part used for steel parts used by breaking and dividing. Is. Background art
- Non-tempered steel is a steel that has been designed to achieve excellent mechanical properties after hot forging and remain air-cooled or air-cooled.
- the conrod is a component that transmits the movement of the engine's pistons to the crankshaft ⁇ and consists of two parts: a cap and a rod.
- the rod is attached to the crankshaft by clamping the crankshaft and fitting the cap and the rod into the large end and fastening them with bolts.
- the mating surface of the cap and the rod is processed with high precision by machining. Has been created by.
- pin processing is often performed so that the mating surfaces do not deviate, and the processing process becomes more complicated, resulting in high manufacturing costs.
- C 70 S 6 is superior in break separation due to its small deformation at break, but its structure is coarser than ferrite and pearlite structures of medium carbon non-heat treated steel, which is the current steel for conrod.
- yield ratio yield strength and tensile strength
- the perlite structure was inferior in machinability, so it did not spread widely
- Japanese Laid-Open Patent Publication No. 2 0 2 — 2 5 6 3 94 describes a technique for refining the structure by adjusting the balance between ⁇ and Al and ⁇ and N.
- Pb is used as a means to ensure machinability.
- Japanese Laid-Open Patent Publication No. 2 0 0 3 — 1 9 3 1 8 4 describes a technique for improving fracture separability and machinability by defining the amount of C and V and the ferrite area ratio. .
- the ferrite area ratio is as low as 20% or less, the yield ratio is low and it cannot be applied to high-strength rods.
- Japanese Laid-Open Patent Publication No. 2 0 0 3-3 0 1 2 3 8 describes a technique that refines the structure by increasing the number of M n S to increase the yield strength and at the same time improve the fracture separation. Has been. This technology disperses a large amount of MnS with an equivalent circle diameter of about 1 m. However, such a large amount of S inevitably accompanies the formation of coarse Mn S with a large aspect ratio that stretches in the rolling and forging directions.
- JP 2 0 0 0-7 3 1 4 1 specifies the number of sulfide inclusions with a width of 1 m or more, and further defines the aspect ratio to reduce ductility * toughness and break. Separation Techniques for improving performance are described.
- the present invention is not subjected to hot tempering for hot forging, which does not impair manufacturability and mechanical properties, and is excellent in fracture separation and machinability without adding Pb or the like. It aims to provide steel and hot rolled steel, and hot forged non-tempered steel parts.
- the present invention optimizes the amounts of C and V to improve fracture separation, and further controls the amount of addition of the three components Zr, Ca, and A1 simultaneously to make a large amount of MnS inclusions fine. It has been found that this makes it possible to further improve the breaking separation performance without sacrificing mechanical properties and manufacturability, and at the same time, improve machinability without adding Pb, etc.
- the present invention has been completed and the gist thereof is as follows.
- the M n S inclusions in the present invention include M n S, M n S as a main component, and other sulfide-forming elements such as Ca and Mg, C, and T i. And inclusions containing carbon sulfide forming elements such as Zr.
- Total MnS of MnS-based inclusions having a width of 1 or more at the 1/4 diameter position of the hot-rolled steel material comprising the steel component described in any of (1) to (3) above
- the ratio of the number of existing inclusions to system inclusions is 10% or less (including 0%), and the average aspect ratio of MnS inclusions is 10 or less.
- Fig. 1 is a diagram showing the presence of M n S inclusions in steel.
- V carbides and carbonitrides precipitate during cooling after hot forging, and the ferrite is strengthened by precipitation strengthening, and the ductility and toughness are reduced by strengthening ferritic. And the yield ratio can be increased.
- Mn S inclusions with a small aspect ratio are dispersed in a large amount and finely in the steel, so that the M n S inclusions become a crack propagation path during fracture division, and the fracture separation is improved. Cracks that pass through large and finely dispersed MnS inclusions with a width of less than 1 ⁇ m grow linearly with little branching and bending, so the amount of deformation during fracture separation is small, so that It is advantageous. On the other hand, when the amount of coarse MnS inclusions with a width of 1 m or more is large, separation occurs, and cracks parallel to the extension direction of the MnS inclusions occur, resulting in deformation during fracture separation. Increased, Breaking separability is reduced.
- Mn S inclusions with a small aspect ratio are dispersed in steel in large amounts and finely dispersed, so that machinability can be achieved without impairing mechanical properties such as fatigue properties even if the amount of S is increased. Can be improved.
- the effect of the Zr oxide as a precipitation nucleus is maximized by the composite of Ca oxide in the Zr oxide. Therefore, the simultaneous addition of trace amounts of Zr and Ca increases the crystallization and precipitation sites of effective MnS inclusions, enabling the MnS inclusions to be dispersed uniformly and finely. Become. In addition, Zr and Ca are dissolved in MnS inclusions to form complex sulfides and reduce their deformability, thereby reducing the MnS system during rolling and hot forging. Suppresses the extension of inclusions.
- a 1 2 03 decreases the O in the molten steel to be formed preferentially in the molten steel when A 1 is playful addition, M n S inclusions uniform, Z which have the effect of causing finely distributed r
- the amount of A 1 should be limited as much as possible to prevent oxide formation.
- content% of a component means the mass%.
- C is added in order to secure the tensile strength of the part and increase the fractional structure with low ductility and toughness to obtain good fracture separation. Since it becomes excessively large and the structure becomes coarse and the yield ratio decreases, it is necessary to make the range from more than 0.35% to 0.60%. The preferred range is from more than 0.35% to 0.48%.
- S i is added to strengthen the ferrite by solid solution strengthening and to obtain good fracture separation by reducing the ductility and toughness. However, if added excessively, the ferrite structure fraction becomes excessive and breaks. Since separability is lowered, it is necessary to set the content within the range of 0.5 to 2.5 to 50%. The preferred range is from 0.60% to 1.550%.
- M n is added in order to strengthen the ferrite by solid solution strengthening and to obtain good fracture separation by reducing the ductility 'toughness, but if added excessively, the lamellar spacing of the particulates will be reduced, Not only does the ductility and toughness of parlay ⁇ ⁇ increase and the fracture separability decreases, but it also facilitates the formation of a paynite structure, and the fracture separability significantly decreases.
- P is added to obtain good fracture separation by reducing the ductility and toughness of ferrite and parlite, but it is added excessively. Then, the hot ductility is reduced, and cracks and scratches are liable to occur during hot working, so it is necessary to set the content in the range of 0.0 1 0 to 0.150%. The preferred range is 0.030 to 0.070%.
- Mn S inclusions combines with M n to form M n S (M n S inclusions), and the effect of improving machinability as the addition amount is increased. In order to do so, add it positively. Furthermore, as will be described later, when a small amount of Zr and Ca are added and the amount of A 1 is limited, MnS inclusions with a small aspect ratio are dispersed in a large amount and finely dispersed in the steel. Since this becomes a propagation path of cracks at the time of fracture division, there is an effect of improving fracture separation. On the other hand, if it is added excessively, the hot ductility is lowered and cracking and scratching are likely to occur during hot working, so it is necessary to set the content in the range of 0.040 to 0.150%. The preferred range is 0.06 0 to 0.12 0%.
- V mainly forms carbides and carbonitrides during cooling after hot forging, strengthens the ferrite by strengthening the precipitation, lowers the ductility * toughness, obtains good fracture separation, and yield It is added because it has the effect of increasing the ratio, but even if it is added excessively, the effect is saturated, so it is necessary to make it within the range of 0.1 to 0.5%.
- the preferred range is 0.20 to 0.35%.
- MnS inclusions with a small aspect ratio can be dispersed in a large amount * in steel.
- the MnS inclusions become the propagation path of cracks at the time of fracture division, and the fracture separation is improved.
- Such fine M n S system Cracks that pass through inclusions are advantageous in terms of break separation because they have little branching and bending and grow linearly, so that the amount of deformation during break separation is small.
- the amount of coarse MnS inclusions is large, separation occurs, and cracks parallel to the extension direction of the MnS inclusions cause cracking, which increases the amount of deformation during fracture separation. In addition, the break separation is reduced.
- Mn S inclusions with a small aspect ratio are dispersed in a large amount and finely dispersed in the steel, so that even if the S content is increased, machinability is not impaired without damaging the mechanical properties such as fatigue properties. Therefore, simultaneously controlling the amount of Zr, Ca, and A1 has a very important effect on both fracture separation and machinability.
- Zr is a deoxidizing element and forms a Zr oxide.
- Zr oxide becomes the crystallization and precipitation nuclei of M n S inclusions, increasing the crystallization and precipitation sites of M n S inclusions to disperse M n S inclusions uniformly and finely. effective.
- Zr also dissolves in MnS inclusions to form complex sulfides and reduces their deformability, thereby suppressing elongation of MnS inclusions during rolling and hot forging. effective. Therefore, Zr is an extremely effective element for finely dispersing MnS inclusions and improving anisotropy.
- C a is a deoxidizing element that not only improves the machinability by generating soft oxides, but also forms solid sulfides by dissolving in M n S inclusions to improve its deformability. By lowering, there is an effect of suppressing the extension of MnS inclusions during rolling or hot forging. Furthermore, a trace amount of C a By adding Ca oxide in the Zr oxide by addition, the effect of MnS-based inclusions in the Zr oxide as crystallization and precipitation nuclei is maximized. Therefore, Ca is an effective element for improving the anisotropy of MnS inclusions when a specific amount is added together with Zr.
- the preferred range is 0. 0 0 0 5 to 0.0. 0 30%, the more preferred range is 0.0.0 0 7 to 0.0.0 25, and the more preferred range is 0.0.0 0 1 0 to 0.0. 0 2 0%.
- a 1 is a strong deoxidizing element and forms A 1 2 0 3 .
- a 1 is added to the Zr, C a -added steel, A 1 2 O 3 is preferentially formed. Therefore, it has the effect of uniformly and finely dispersing M n S inclusions. Inhibits the formation of a-type oxides. As a result, a large amount of coarse MnS inclusions that impair fracture separation and mechanical properties such as fatigue are generated, so A 1 should be reduced as much as possible.
- a 1 2 0 3 is hard, it causes tool damage during cutting and promotes tool wear. Therefore, the amount of A 1 should be limited as much as possible, and should be limited to less than 0.0 10%. The preferred range is less than 0.07%. More preferably, it is 0.04% or less.
- the lower limit of A 1 that can be analyzed is 0.0 0 1%.
- N promotes ferrite transformation by forming V nitride and V carbonitride mainly during cooling after hot forging and acting as a transformation nucleus of Ferai
- it is added to suppress the formation of a bainite structure that significantly impairs the fracture separation.
- the hot ductility decreases, and cracking and scratching are likely to occur during hot working.
- the preferred range is from 0.0 0 4 0 to 0.0 1 0 0%.
- N b 0.0 0 5 to 0.0 5 0%
- Nb is added to form good carbide and carbonitride during cooling after hot forging, strengthen ferrite by precipitation strengthening, and obtain good fracture separation by reducing ductility * toughness.
- the preferred range is from 0.0 1 0 to 0.0 30%.
- T i mainly forms carbide and carbonitride during cooling after hot forging
- the effect is not only saturated when added excessively, but rather Since machinability may be reduced, it is necessary to set the content within the range of 0.0 0 5 to 0.0 50%.
- the preferred range is from 0.0 1 0 to 0.0 30%.
- Mg is a deoxidizing element and forms Mg oxide. Since Mg oxide becomes the crystallization and precipitation nuclei of M n S inclusions, the crystallization and precipitation sites of M n S inclusions are increased, and the M n S inclusions are uniformly and finely dispersed. effective. Mg also dissolves in MnS inclusions to form composite sulfides, and their deformation capacity is reduced, thereby suppressing elongation of MnS inclusions during rolling and hot forging. effective. Accordingly, Mg is an effective element for finely dispersing MnS inclusions and improving anisotropy.
- Te, Zn, Sn and the like can be added as long as the effects of the present invention are not impaired.
- the ratio of the number of M n S-based inclusions with a width of 1 im or more to the total M n S-based inclusions at the position of diameter 14 of hot rolled steel is 10% or less (including 0%), The reason why the average aspect ratio of M n S inclusions was set to 10 or less will be explained.
- FIG. 1 shows an observation example of MnS inclusions.
- MnS inclusions In the comparative example shown in Fig. 1 (a), there are many MnS inclusions with a width of l ⁇ m or more, and the aspect ratio exceeds 10 in many cases.
- M n S inclusions By dispersing a large amount and fine dispersion of M n S inclusions in the steel with a small aspect ratio in the steel, the M n S inclusions become a propagation path of cracks at the time of fracture division, and the fracture separation property is improved.
- Such cracks that pass through fine MnS inclusions with a width of less than 1 m grow linearly with few branches and bends, and therefore have little deformation during break separation, which is advantageous for break separation. It is.
- Mn S inclusions with an aspect ratio exceeding 10 are large, or if the amount of MnS inclusions with a width of 1 m or more is large, separation occurs and the MnS inclusions When cracks are generated parallel to the extension direction of inclusions, the amount of deformation during break separation increases, and the break separation property decreases.
- Mn S inclusions with a small aspect ratio can be dispersed in steel in large amounts and finely dispersed to improve machinability without impairing mechanical properties such as fatigue properties even if the amount of S is increased. be able to.
- the ratio of the total number of M n S inclusions of M n S inclusions with a width of 1 m or more at the center position between the center and the surface of the steel bar after hot rolling is 10 %
- the average aspect ratio of M n S inclusions must be limited to 10 or less.
- the preferred ranges are 5% or less and 8 or less, respectively.
- a more preferable range of the average aspect ratio of the M n S inclusion is 4.5 or less. Note that MnS inclusions in hot rolled steel do not grow by heating prior to hot forging.
- the steel structure has a bainitic structure fraction of 3% or less (including 0%), and the remaining structure is a ferrite-parley cocoon structure.
- the structure of the part after hot forging at normal temperature and air cooling basically becomes a ferrite-pearlite structure.
- the ferrite and pearlite structure defined in the scope of the present invention is excellent in fracture separation because it can reduce ductility and toughness. However, if the ferrite structure is mixed due to cooling conditions after hot forging, etc.
- the bainitic structure is small, and the cooling conditions after hot forging are set appropriately so that the It is necessary to suppress generation and to reduce the pay area ratio to 3% or less (including 0%). If the pay organization is less than 3%, the negative impact will be minimal.
- the ferritic structure is a mirror-polished, and when the Nital corrosion is performed to reveal the structure, the boundary with the adjacent structure is relatively A clear white structure with almost no iron carbide inside.
- the pearlite structure is a black or gray structure as observed with an optical microscope, and refers to a layered lamellar structure as observed with an electron microscope at a magnification of 10:00 to 20:00.
- the bainitic structure is a structure other than the above, and in many cases is a white structure as observed with an optical microscope, and refers to an amorphous particle on which a small amount of iron carbide is precipitated.
- the bainitic structure does not exceed 3% in hot forged parts, not only air cooling but also accelerated cooling such as blast cooling can be performed after hot forging. is there.
- Cu, Ni, and Mo do not have a special effect on the material of the non-heat treated steel of the present invention as long as they are in trace amounts, but any of them tends to generate a paynite structure depending on the amount of addition. There is an effect to.
- O is excessively present in the steel, and it is combined with S i, A 1, and Z r to form hard oxide, and the amount increases to increase the coverage. It is desirable to limit it to 0.02% or less because it reduces the machinability and makes it impossible to finely disperse the Zr oxide.
- Converter molten steel having the composition shown in Table 1 was manufactured by continuous forging, and, if necessary, a 16 2 mm square rolled material was obtained through a soaking diffusion process and a block rolling process. Next, a steel bar shape with a diameter of 45 mm was formed by hot rolling.
- the shaded and underlined parts of the comparative steel in Table 1 indicate that they are outside the scope of the present invention.
- MnS inclusions were extracted by an image processor. For each extracted MnS inclusion, the length in the rolling direction, the radial thickness, and the aspect ratio (length in the rolling direction Z thickness in the radial direction) were quantified. Measurement field 5 0 0 times, 1 field area and 9 0 0 0 X m 2, were measure for 5 0 field. From the obtained data, the average aspect ratio and the ratio of the number of MnS inclusions with a width of 1 / m or more to the total MnS inclusions were calculated.
- a test piece equivalent to a forging rod was prepared by hot forging. Specifically, a steel bar with a diameter of 45 mm is heated to 1 1 5 0 to 1 2 80 and then forged perpendicularly to the length of the steel bar to a thickness of 20 mm. Or it cooled to room temperature by the blast cooling by a blast cooling device. Manufacture No. 5 was subjected to buffered air cooling, and Manufacture No. 24 was subjected to strong air cooling. From the cooled forged material, JIS No. 4 tensile test piece, test piece for machinability evaluation, and test piece for fracture separation evaluation of the shape corresponding to the large end of the rod were processed.
- Test specimen for fracture separation evaluation is a 80 mm x 80 mm, 18 mm thick plate with a 50 mm diameter hole in the center, and the inner surface of the 50 mm diameter hole.
- 45 degrees V notch processing with depth of l mm and tip curvature of 0.5 mm at two locations facing each other at 1800 degrees in the direction perpendicular to the length direction of the steel bar before forging was given.
- a through hole with a diameter of 8 mm was drilled so that the center line was 8 mm from the side surface on the notching side.
- the test device for fracture separation evaluation consists of a split mold and a falling weight tester.
- the split mold is a cylinder formed on a rectangular steel material divided into two along the center line. With one shape, one side is fixed and one side moves on the rail. Wedge holes are machined on the mating surfaces of the two half cylinders.
- the test piece is inserted into this split mold, and a wedge is inserted and placed on the falling weight.
- the falling weight weighs 200 kg and is a mechanism that falls along the guide. When the falling weight is dropped, the wedge is driven and the specimen is pulled and broken in two.
- the periphery of the test piece is fixed so as to be pressed against the split mold so that the test piece does not separate from the split mold at the time of breaking.
- the fracture was performed at a falling weight height of 100 mm, the specimens after fracture were put together and ported, and changes in the fracture direction and the inner diameter in the direction perpendicular to the fracture direction were measured.
- Table 2 shows the results of evaluation of the various characteristics described above. As for the yield ratio, those less than 0.75 were not achieved. With respect to the breaking separability, we did not achieve the target when the amount of deformation exceeded 100. For machinability, VL 1 0 0 0 is less than 40 m Z min. Manufactured with No. 2 2 (Steel No. 2 2) Pb-added steel. The target was not achieved.
- M n S in the column of “M n S width” and “M n S average aspect ratio” in Table 2 refers to M n S inclusions.
- M n S is used for convenience.
- Production No .:! To 13 Examples of the present invention all achieved the target, and it can be seen that they have excellent fracture separation and machinability.
- the production Nos. 14 to 17 are outside the scope of the present invention, the amount of Zr, Al, Ca, and S cannot be finely dispersed in the MnS inclusions. Since the average aspect ratio of the system inclusions does not satisfy all the requirements of the present invention, the break separation property is poor.
- N o. 14 is not added with Zr, so N o.
- the fracture division method can be performed, since it is excellent in machinability, for example, the manufacturing process of a car rod can be greatly simplified, the cost can be reduced, and the weight of parts can be reduced.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Steel (AREA)
- Forging (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002681788A CA2681788A1 (en) | 2008-02-26 | 2008-11-05 | Hot-forging micro-alloyed steel and hot-rolled steel excellent in fracture-splitability and machinability, and component made of hot-forged microalloyed steel |
KR1020097016019A KR101177542B1 (ko) | 2008-02-26 | 2008-11-05 | 파단 분리성 및 피삭성이 우수한 열간 단조용 비조질강과 열간 압연 강재 및 열간 단조 비조질강 부품 |
JP2009513143A JP5251872B2 (ja) | 2008-02-26 | 2008-11-05 | 破断分離性及び被削性に優れた熱間鍛造用非調質鋼及び熱間圧延鋼材、並びに熱間鍛造非調質鋼部品 |
US12/450,567 US8715428B2 (en) | 2008-02-26 | 2008-11-05 | Hot-forging micro-alloyed steel and hot-rolled steel excellent in fracture-splitability and machinability, and component made of hot-forged microalloyed steel |
EP08872018.0A EP2246451B1 (en) | 2008-02-26 | 2008-11-05 | Hot forging micro alloyed steel and hot rolled steel material having excellent fracture splittability and machinability, and part thereof. |
PL08872018T PL2246451T3 (pl) | 2008-02-26 | 2008-11-05 | Kuta na gorąco mikrostopowa stal oraz stal walcowana na gorąco mająca doskonałą podatność na dzielenie metodą łamania i podatność na obróbkę maszynową, oraz część z niej |
CN2008800108201A CN101652493B (zh) | 2008-02-26 | 2008-11-05 | 断裂分离性和可切削性优异的热锻造用非调质钢和热轧钢材以及热锻造非调质钢部件 |
BRPI0809532-9A BRPI0809532A2 (pt) | 2008-02-26 | 2008-11-05 | aço microligado forjado a quente e aço laminado a quente excelentes em capacidade de separação por fratura e em capacidade de usinagem, e componente feito de aço microligado forjado a quente |
US14/245,048 US9255314B2 (en) | 2008-02-26 | 2014-04-04 | Hot-forging micro-alloyed steel and hot-rolled steel excellent in fracture-splitability and machinability, and component made of hot-forged microalloyed steel |
Applications Claiming Priority (2)
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JP2008045140 | 2008-02-26 | ||
JP2008-045140 | 2008-02-26 |
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US12/450,567 A-371-Of-International US8715428B2 (en) | 2008-02-26 | 2008-11-05 | Hot-forging micro-alloyed steel and hot-rolled steel excellent in fracture-splitability and machinability, and component made of hot-forged microalloyed steel |
US14/245,048 Continuation US9255314B2 (en) | 2008-02-26 | 2014-04-04 | Hot-forging micro-alloyed steel and hot-rolled steel excellent in fracture-splitability and machinability, and component made of hot-forged microalloyed steel |
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WO2009107282A1 true WO2009107282A1 (ja) | 2009-09-03 |
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PCT/JP2008/070537 WO2009107282A1 (ja) | 2008-02-26 | 2008-11-05 | 破断分離性及び被削性に優れた熱間鍛造用非調質鋼及び熱間圧延鋼材、並びに熱間鍛造非調質鋼部品 |
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US (2) | US8715428B2 (ja) |
EP (1) | EP2246451B1 (ja) |
JP (1) | JP5251872B2 (ja) |
KR (2) | KR101177542B1 (ja) |
CN (1) | CN101652493B (ja) |
BR (1) | BRPI0809532A2 (ja) |
CA (1) | CA2681788A1 (ja) |
MY (1) | MY154415A (ja) |
PL (1) | PL2246451T3 (ja) |
RU (1) | RU2431694C2 (ja) |
TW (1) | TWI470089B (ja) |
WO (1) | WO2009107282A1 (ja) |
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WO2016143812A1 (ja) * | 2015-03-09 | 2016-09-15 | 新日鐵住金株式会社 | 熱間圧延鋼材および鋼部品 |
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- 2008-11-05 WO PCT/JP2008/070537 patent/WO2009107282A1/ja active Application Filing
- 2008-11-05 KR KR1020097016019A patent/KR101177542B1/ko active IP Right Grant
- 2008-11-05 KR KR1020127009423A patent/KR20120049405A/ko not_active Application Discontinuation
- 2008-11-05 PL PL08872018T patent/PL2246451T3/pl unknown
- 2008-11-05 BR BRPI0809532-9A patent/BRPI0809532A2/pt not_active IP Right Cessation
- 2008-11-05 EP EP08872018.0A patent/EP2246451B1/en active Active
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- 2008-11-05 JP JP2009513143A patent/JP5251872B2/ja active Active
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US10036086B2 (en) | 2013-04-30 | 2018-07-31 | Nippon Steel & Sumitomo Metal Corporation | Non-heat treated steel |
JP2015183253A (ja) * | 2014-03-25 | 2015-10-22 | 愛知製鋼株式会社 | 被削性と疲労強度に優れ、硬さばらつきの小さい省v型熱間鍛造用非調質鋼と上記鋼を用いて製造された熱間鍛造部品及びその製造方法 |
WO2016143812A1 (ja) * | 2015-03-09 | 2016-09-15 | 新日鐵住金株式会社 | 熱間圧延鋼材および鋼部品 |
JPWO2016143812A1 (ja) * | 2015-03-09 | 2017-12-28 | 新日鐵住金株式会社 | 熱間圧延鋼材および鋼部品 |
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JPWO2017110910A1 (ja) * | 2015-12-25 | 2018-09-13 | 新日鐵住金株式会社 | 鋼部品 |
JP2018035422A (ja) * | 2016-09-01 | 2018-03-08 | 新日鐵住金株式会社 | 高強度熱間鍛造非調質鋼部品 |
US11111569B2 (en) | 2017-02-24 | 2021-09-07 | Nippon Steel Corporation | Non-heat treated steel bar |
US11180818B2 (en) | 2017-02-24 | 2021-11-23 | Nippon Steel Corporation | Steel bar for hot forging |
WO2019203348A1 (ja) * | 2018-04-20 | 2019-10-24 | 日本製鉄株式会社 | 鋼、機械部品及びコネクティングロッド |
JPWO2019203348A1 (ja) * | 2018-04-20 | 2020-04-30 | 日本製鉄株式会社 | コネクティングロッド用鋼材、及びコネクティングロッド |
JP7489811B2 (ja) | 2020-03-31 | 2024-05-24 | 株式会社神戸製鋼所 | 非調質鍛造用鋼および非調質鍛造部品 |
Also Published As
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US20140219858A1 (en) | 2014-08-07 |
RU2009136184A (ru) | 2011-04-10 |
CN101652493B (zh) | 2011-11-23 |
EP2246451B1 (en) | 2013-10-09 |
EP2246451A1 (en) | 2010-11-03 |
BRPI0809532A2 (pt) | 2011-11-08 |
KR20090109548A (ko) | 2009-10-20 |
CN101652493A (zh) | 2010-02-17 |
JP5251872B2 (ja) | 2013-07-31 |
KR101177542B1 (ko) | 2012-08-28 |
PL2246451T3 (pl) | 2014-02-28 |
US9255314B2 (en) | 2016-02-09 |
US20100143180A1 (en) | 2010-06-10 |
TW200936784A (en) | 2009-09-01 |
CA2681788A1 (en) | 2009-09-03 |
TWI470089B (zh) | 2015-01-21 |
JPWO2009107282A1 (ja) | 2011-06-30 |
US8715428B2 (en) | 2014-05-06 |
KR20120049405A (ko) | 2012-05-16 |
EP2246451A4 (en) | 2012-01-04 |
MY154415A (en) | 2015-06-15 |
RU2431694C2 (ru) | 2011-10-20 |
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