CN116536570B - G26CrMo4 cast steel without casting crack and application thereof - Google Patents
G26CrMo4 cast steel without casting crack and application thereof Download PDFInfo
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- CN116536570B CN116536570B CN202310571552.7A CN202310571552A CN116536570B CN 116536570 B CN116536570 B CN 116536570B CN 202310571552 A CN202310571552 A CN 202310571552A CN 116536570 B CN116536570 B CN 116536570B
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- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 111
- 238000005266 casting Methods 0.000 title claims abstract description 97
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000007689 inspection Methods 0.000 claims description 8
- 238000010583 slow cooling Methods 0.000 claims description 8
- 239000006247 magnetic powder Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 20
- 238000004519 manufacturing process Methods 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 239000011572 manganese Substances 0.000 description 16
- 238000007711 solidification Methods 0.000 description 13
- 230000008023 solidification Effects 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 239000011651 chromium Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 7
- 229910052748 manganese Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010921 in-depth analysis Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
Abstract
The invention relates to a G26CrMo4 cast steel without casting cracks, which comprises the following components: c:0.22-0.29%, si less than or equal to 0.6%, mn:0.5-0.8%, cr:0.8-1.2%, mo:0.15-0.3%, al:0.3-0.8%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, and the balance is Fe and unavoidable impurities, and the casting temperature T of the G26CrMo4 cast steel after casting meets the following conditions: t (T) 2 ≤T≤T 1 Wherein: t (T) 1 =518‑14.6[C]‑12.52[Mn]‑18.45[Cr]‑10.22[Mo]+3.63[Si]+24.8[Al]Unit deg.c; t (T) 2 =416+128.5[C]+197.2[S]‑3.62[Si]‑3.43[Mn]‑2.58[Cr]‑1.17[Mo]‑1.81[Al]Unit deg.c; [ C]、[Mn]、[Cr]、[Mo]、[Si]、[Al]、[S]Respectively represent the mass percent of C, mn, cr, mo, si, al, S in cast steel.
Description
Technical Field
The invention relates to cast steel, in particular to G26CrMo4 cast steel without casting cracks, which is suitable for parts such as train couplers, valve bodies, cylinders, bogies and the like.
Background
Cast steel has strength, toughness and plasticity, and is therefore widely used in various mechanical parts. G26CrMo4 is a European standard cast steel grade, and in recent years, more and more factories begin to produce cast steel products made of the material. However, in actual production, the G26CrMo4 cast steel has been found to have a lot of casting cracks, affecting various mechanical properties of the cast steel. After the casting of the G26CrMo4 steel casting is finished, a repair welding mode is generally adopted in a factory to repair cracks, however, the repair welding increases the process cost and the labor cost on one hand, and on the other hand, the welded HAZ often generates secondary crack defects or influences toughness and other mechanical properties, so that the casting performance cannot reach the standard, and the rejection rate of the steel casting is higher. Therefore, the production cost of the current high-quality G26CrMo4 cast steel is high.
Disclosure of Invention
The G26CrMo4 cast steel without casting cracks provided by the invention has good casting quality, the cast is free from cracks after magnetic powder inspection, repair operations such as repair welding and the like are not needed, and the product yield is high, so that the working procedure, manpower and production cost are greatly reduced, and the low-cost batch production of high-quality G26CrMo4 cast steel is facilitated.
The technical purpose of the invention is realized by the following means.
The invention aims to provide a G26CrMo4 cast steel without casting cracks, which comprises the following components in percentage by weight: c:0.22-0.29%, si less than or equal to 0.6%, mn:0.5-0.8%, cr:0.8-1.2%, mo:0.15-0.3%, al:0.3-0.8%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, and the balance is Fe and unavoidable impurities, and the casting temperature T of the G26CrMo4 cast steel after casting meets the following conditions: t (T) 2 ≤T≤T 1 Wherein:
T 1 =518-14.6[C]-12.52[Mn]-18.45[Cr]-10.22[Mo]+3.63[Si]+24.8[Al]unit deg.c;
T 2 =416+128.5[C]+197.2[S]-3.62[Si]-3.43[Mn]-2.58[Cr]-1.17[Mo]-1.81[Al]unit deg.c;
[C] the contents of (Mn), (Cr), (Mo), (Si), (Al) and (S) respectively represent the mass percentage of C, mn, cr, mo, si, al, S in the cast steel.
The principle of the composition design of the present invention will be described.
In the production practice process, the inventor finds the problem of cracking of the G26CrMo4 cast steel, and carries out in-depth analysis on the cracking, and the reasons for the cracking are mainly as follows: firstly, the cast steel has a wider solidification temperature interval, when the surface layer of the cast is solidified and only a plurality of dense dendrites are formed in the cast, some molten steel is still present between dendrites, the strength of the steel is low, and cracks are generated when the shrinkage of the cast is hindered. Secondly, the time of box breaking has important influence on the cracks of the steel castings, the box breaking temperature is too high, the castings are still at a higher temperature, the overall strength of the castings is poor, the steel castings lose the support of the casting mould, the cracks are initiated, the box breaking temperature is too low, the castings shrink under the restraint of sand cores, the casting mould and the like, and the castings generate larger stress, so that the castings become starting points of the cracks.
Accordingly, the inventors of the present invention have made a great deal of practical exploration based on the above knowledge. Finally, the discovery is that under the element component system of the G26CrMo4 cast steel, a certain amount of Al is added to narrow the solidification temperature interval of the cast steel and slow down cracks, in addition, the casting temperature is required to be precisely controlled, and the G26CrMo4 cast steel without casting cracks is finally obtained.
The tapping temperature, i.e. the tapping temperature, described in the present invention refers to the temperature of the casting at the time of tapping (tapping), which can be obtained by monitoring after casting of the cast steel by laying thermocouples in advance in the cavity or on the side walls of the cavity, as a non-limiting description.
As described above, the inventors have studied that the upper limit of the case-breaking temperature is closely related to the capability of resisting deformation and cracks at a specific temperature of the cast steel, and the lower limit of the case-breaking temperature is mainly influenced by the solidification shrinkage of the cast steel, and the shrinkage of the cast steel is forcedly restrained by a sand core, a casting mold, and the like, so that cracks appear. That is, the boxing temperature of the present invention needs to be controlled within a range of such a temperature interval: i.e. the steel casting has sufficient strength to resist deformation and cracking without starting to shrink by a large amount of deformation.
The inventor finds that the two temperatures are related to the components of cast steel through repeated experiments and researches, so that the inventor finally determines the upper limit T of the casting temperature on the basis of a large number of experiments by combining the specific element system and the Al content of the G26CrMo4 cast steel 1 And lower limit T 2 And is determined and expressed by the following formula, namely:
T 1 =518-14.6[C]-12.52[Mn]-18.45[Cr]-10.22[Mo]+3.63[Si]+24.8[Al]unit deg.c;
T 2 =416+128.5[C]+197.2[S]-3.62[Si]-3.43[Mn]-2.58[Cr]-1.17[Mo]-1.81[Al]unit deg.c;
[C] the contents of (Mn), (Cr), (Mo), (Si), (Al) and (S) respectively represent the mass percentage of C, mn, cr, mo, si, al, S in the cast steel.
In other words, in the casting process of the cast steel, the casting temperature range meeting the requirements can be rapidly determined by only detecting the components of the cast steel liquid before casting or casting a test block separately, water quenching the test block after casting and detecting the components, so that the production is better guided, and the G26CrMo4 cast steel without casting cracks is ensured to be obtained.
The invention finally obtains the crack-free G26CrMo4 cast steel through the control of the Al content and the control of the casting temperature. Compared with the conventionally produced G26CrMo4 cast steel, the G26CrMo4 cast steel does not need repair welding because of no casting crack, simplifies the production process, reduces the production cost, improves the yield of products, and realizes the large-scale and low-cost production of the G26CrMo4 cast steel.
Next, the roles of the elements of the present invention are described on the basis of the foregoing principle.
Carbon: carbon is an element that ensures strength and hardness of cast steel, but too high a carbon content affects plasticity and toughness of cast steel. And the inventors found that the carbon content has a significant effect on the shrinkage during cooling of cast steel. The invention controls the carbon content to be 0.22-0.29%.
Silicon: silicon is an element for ensuring strength and hardness of cast steel, and contributes to improvement of casting fluidity, but when the silicon content is too high, plasticity and toughness of cast steel are affected, and silicon is liable to segregate and cause formation of nonmetallic inclusions, deteriorating performance of cast steel. The silicon content is controlled to be below 0.6%.
Manganese: manganese is an element for improving the strength of cast steel, if it is too low, the strength is not ensured, if it is too high, the toughness and plasticity are deteriorated, and manganese is an element for improving the hardenability, and the tendency of crack initiation in the solidification process of cast steel increases when the manganese content is too high. The invention controls the manganese content to be 0.5-0.8%.
Chromium: chromium is an element for improving the strength and wear resistance of cast steel, and if it is too low, the strength and wear resistance are not ensured, and if it is too high, the toughness and plasticity are deteriorated, and chromium is an element for improving hardenability, and if it is too high, the crack initiation tendency in the solidification process of cast steel is increased. The invention controls the manganese content to be 0.8-1.2%.
Molybdenum: molybdenum is an element for improving strength, if it is too low, strength is not ensured, if it is too high, toughness and plasticity are deteriorated, and molybdenum is an element for improving hardenability, and if it is too high, the tendency of crack initiation during solidification of cast steel is increased. The manganese content is controlled to be 0.15-0.3%.
Aluminum: in the invention, aluminum is an element which is specially added, and the inventor discovers that 0.3 to 0.8 percent of aluminum can narrow the solidification temperature range of cast steel and inhibit the occurrence of cracks in the solidification process in a G26CrMo4 cast steel system. When the aluminum content is too low, the effect is not obvious, and when the aluminum content is too high, segregation and nonmetallic inclusion occur, but casting cracks occur, so that the performance of cast steel is deteriorated. The invention controls the aluminum content to be 0.3-0.8%.
Phosphorus, sulfur: phosphorus and sulfur are both impurity elements in cast steel. P is easy to increase brittleness of cast steel, S is easy to form inclusion, and the performance of cast steel is influenced, in particular, the S content has an important influence on the shrinkage rate of the cast steel in the cooling process, so that the P and S contents are controlled to be less than 0.02 percent.
In addition to the above elements, the present invention also provides for upper and lower limits of steel casting box-making temperatures, as previously described.
T 1 =518-14.6[C]-12.52[Mn]-18.45[Cr]-10.22[Mo]+3.63[Si]+24.8[Al]Unit deg.c;
T 2 =416+128.5[C]+197.2[S]-3.62[Si]-3.43[Mn]-2.58[Cr]-1.17[Mo]-1.81[Al]unit deg.c;
[C] the contents of (Mn), (Cr), (Mo), (Si), (Al) and (S) respectively represent the mass percentage of C, mn, cr, mo, si, al, S in the cast steel.
In the production process of the cast steel, the box forming temperature T needs to be controlled to meet the following conditions: t (T) 2 ≤T≤T 1 . The casting temperature is too high, and the crack resistance of the steel casting is insufficient, so that casting cracks appear, and the casting cracks appear due to the forced constraint of the shrinkage of the cast steel by the sand core, the casting mould and the like when the casting temperature is too low. That is, the boxing temperature of the present invention needs to be controlled within a range of such a temperature interval: i.e. the cast steel has sufficient strength to resist deformation and cracking, without starting to shrink by a large amount of deformation.
Therefore, the cast steel with the components of the invention can be cast without casting cracks by controlling the casting temperature in the corresponding interval after casting, so that the repair welding step of unordered crack repair is simplified, the production process is simplified, the production cost is reduced, the yield of products is improved, and the large-scale and low-cost production of the G26CrMo4 cast steel is realized.
The G26CrMo4 cast steel provided by the invention has no cracks after magnetic powder inspection, has excellent casting quality, greatly improves the production efficiency and the yield, and reduces the production cost.
As a further improvement, the G26CrMo4 cast steel is placed in a heat treatment furnace for slow cooling after being cast, and the temperature stress of the cast steel after being cast can be reduced, the stress concentration is avoided, and the stability and reliability of mechanical properties of the cast steel in the later service process are further improved through slow cooling after being cast.
As a further improvement, the cooling speed of the slow cooling is controlled to be 2-10 ℃/h. The slower the slow cooling speed is, the more favorable is to avoid stress concentration, but the too slow cooling speed is uneconomical in cost, is unfavorable for improving the production efficiency and reducing the production cost, and the too fast slow cooling speed is insufficient in stress release and is easy to influence the later service life of the steel castings.
By way of non-limiting illustration, the G26CrMo4 cast steel of this invention is applied to train couplers, valve bodies, cylinders, bogies, and the like, but is not limited to these.
The invention also provides a train coupler head which is prepared from the G26CrMo4 cast steel without casting cracks, and the G26CrMo4 cast steel without casting cracks has good stability and excellent mechanical property after long-term service, so that the prepared train coupler head has strong reliability and safety. The trains include, but are not limited to, subway trains, railway passenger or freight trains, motor train units or high-speed rails and the like.
The invention has the following technical effects.
According to the invention, a certain amount of Al is added under the G26CrMo4 cast steel element component system, so that the solidification temperature interval of cast steel can be narrowed, and the occurrence of cracks is slowed down, meanwhile, the invention also combines specific components to accurately control the casting temperature, provides a corresponding casting temperature range interval, and can quickly obtain the most suitable casting temperature by combining specific cast steel components by production staff, thereby better guiding production and ensuring that the G26CrMo4 cast steel without casting cracks is obtained. Compared with the G26CrMo4 cast steel produced conventionally, the G26CrMo4 cast steel provided by the invention has no casting crack, so that repair welding repair is not needed, the production process is simplified, the production cost is reduced, the yield of the product is improved, and the performance of the steel casting is ensured.
Detailed Description
In order to enable those skilled in the art to fully understand the technical scheme and the beneficial effects of the present invention, the following description is made with reference to specific test examples.
Molten steel is smelted according to the design components, on-line inspection is carried out on the molten steel before casting, and then each furnace molten steel is cast into a plurality of steel ingots, wherein the steel ingots are in a rectangular shape (the thickness of the steel ingots is 60mm, the width of the steel ingots is 100mm, and the two side lengths of the steel ingots are 300 mm), so that the casting quality of common surfaces can be detected, and the casting quality of right-angle turning positions (namely positions where stress concentration is easy to occur) can be detected, and the specific components are shown in table 1. After casting, the casting operation was performed with reference to the casting temperature T of table 2, cast steel after casting was air-cooled to room temperature, and then subjected to magnetic powder inspection, and whether cast steel had casting crack defects or not was detected and described in table 2, wherein: t (T) 1 And T 2 Calculated by referring to the formula described in the specification。
Table 1: the components of each cast steel are in percent and the balance is Fe.
And controlling different boxing temperatures T of cast steel with test numbers 1-9 in the cooling process, and performing magnetic powder inspection on the finally obtained casting to detect whether cracks exist or not, wherein the results are shown in Table 2.
Table 2: and (5) the box-breaking temperature and the crack detection result.
The above examples and comparative examples are further described by way of analysis with reference to tables 1 to 2.
Test numbers 1 to 6 in Table 1 all meet the composition requirements of the present invention. In Table 2, the case number 1-2, 1-3, 2-2, 2-3, 3-2, 3-3, 4-2, 4-3, 5-2, 5-3, 6-2, 6-3 in case of the case temperature is T calculated from the corresponding components 2 ~T 1 And finally, the obtained cast steel is subjected to magnetic powder inspection and has no cracks in the range. The box-breaking temperatures T of the box-breaking serial numbers 1-1, 1-4, 2-1, 2-4, 3-1, 3-4, 4-1, 4-4, 5-1, 5-4, 6-1 and 6-4 are not T 2 ~T 1 And finally, the obtained cast steel part is subjected to magnetic powder inspection to find crack defects. Therefore, it was confirmed that the G26CrMo4 cast steel free of casting cracks of the present invention could not be obtained if only the composition satisfies the requirements of the invention without controlling the casting temperature. The casting temperature is too high, and the crack resistance of the steel casting is insufficient, so that casting cracks appear, and the casting cracks appear due to the forced constraint of the shrinkage of the cast steel by the sand core, the casting mould and the like when the casting temperature is too low. This demonstrates that the casting temperature of the cast steel needs to be controlled within a reasonable range to facilitate obtaining a G26CrMo4 cast steel without casting cracks. However, the G26CrMo4 cast steel without casting cracks was also not obtained by mere control of the casting temperature, as further described below in connection with test numbers 7-9.
Test numbers 7 to 9 in table 1 do not meet the requirements of the invention.
Test No. 7 shows that Al was not added to the cast steel according to test No. 4, and that the cast steel was obtained by casting the cast steel according to the composition calculation, as in the conventional cast steel according to G26CrMo4, at T as shown by casting numbers 7-1 and 7-2 2 ~T 1 In the range, the finally obtained G26CrMo4 cast steel still has crack defects, which shows that the addition of Al plays an important role in narrowing the solidification temperature interval of cast steel and resisting casting cracks.
Test No. 8 shows that the addition amount of Al is reduced based on test No. 5, and is lower than the required range of the Al content of the present invention, and it is known from the box numbers 8-1 and 8-2 that even if the box forming temperature is T obtained by the calculation of the components 2 ~T 1 In the range, the finally obtained G26CrMo4 cast steel still has crack defects, which indicates that the solidification temperature interval of cast steel can be effectively narrowed and casting cracks can be resisted by proper addition of Al, and the effect of excessively low Al content on narrowing the solidification temperature interval of cast steel and resisting the casting cracks is not obvious.
Test No. 9 shows that the addition amount of Al is increased based on test No. 6, and is higher than the required range of the Al content of the present invention, and it is known from the box numbers 9-1 and 9-2 that even if the box forming temperature is T obtained by the calculation of the components 2 ~T 1 In the range, the finally obtained G26CrMo4 cast steel still has crack defects, which indicates that the solidification temperature interval of the cast steel can be effectively narrowed and casting cracks are resisted by proper addition of Al, the segregation is easily caused by the excessively high Al content, nonmetallic inclusions are increased, and the cast steel becomes a starting point of crack initiation.
It is obvious from the above that the obtaining of the G26CrMo4 cast steel without casting cracks requires not only adding a proper amount of Al, but also precise control of the casting temperature. According to the invention, through component improvement and precise control of the box-forging temperature, the G26CrMo4 cast steel piece without casting cracks is finally obtained.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The G26CrMo4 cast steel without casting cracks is characterized in that the G26CrMo4 cast steel comprises the following components: c:0.22-0.29%, si less than or equal to 0.6%, mn:0.5-0.8%, cr:0.8-1.2%, mo:0.15-0.3%, al:0.3-0.8%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, and the balance is Fe and unavoidable impurities, and the casting temperature T of the G26CrMo4 cast steel after casting meets the following conditions: t (T) 2 ≤T≤T 1 Wherein:
T 1 =518-14.6[C]-12.52[Mn]-18.45[Cr]-10.22[Mo]+3.63[Si]+24.8[Al]unit deg.c;
T 2 =416+128.5[C]+197.2[S]-3.62[Si]-3.43[Mn]-2.58[Cr]-1.17[Mo]-1.81[Al]unit deg.c;
[C] the contents of (Mn), (Cr), (Mo), (Si), (Al) and (S) respectively represent the mass percentage of C, mn, cr, mo, si, al, S in the cast steel.
2. The cast steel of claim 1, wherein the cast steel is crack-free by magnetic powder inspection.
3. The cast steel of claim 1, wherein the cast steel is placed in a heat treatment furnace for slow cooling after being cast and cased.
4. A G26CrMo4 cast steel free of casting cracks according to claim 3, wherein the cooling rate of said slow cooling is controlled to be 2-10 ℃/h.
5. The cast steel of claim 1, wherein the cast steel is used in train coupler, valve body, cylinder, and bogie components.
6. A train coupler knuckle prepared from the cast steel G26CrMo4 free of casting cracks according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310571552.7A CN116536570B (en) | 2023-05-21 | 2023-05-21 | G26CrMo4 cast steel without casting crack and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310571552.7A CN116536570B (en) | 2023-05-21 | 2023-05-21 | G26CrMo4 cast steel without casting crack and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116536570A CN116536570A (en) | 2023-08-04 |
| CN116536570B true CN116536570B (en) | 2024-04-12 |
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