JP3245039B2 - High wear resistant high Mn cast steel and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high wear resistant and high Mn cast steel used for a wear resistant member subjected to impact and a method for producing the same, and particularly to a liner material for a crusher such as a cone crusher or a jaw crusher. High wear resistance used M
The present invention relates to an n cast steel and a method for producing the same.

[0002]

2. Description of the Related Art High Mn cast steels have both work hardening characteristics and toughness and have been used as wear-resistant members subjected to impact. Since high Mn cast steel has excellent wear resistance, it is frequently used as a wear-resistant member of a crusher. Improvement of the processing capacity of the crusher is required, and the size of the crusher is increased and the crushing pressure is increased. For this reason, a high-Mn cast steel having a performance that can withstand severe use conditions is required for a wear-resistant member used in a crusher. Similarly, there is a great demand for high-Mn cast steel capable of coping with severer use conditions for other wear-resistant members subjected to impact.

[0003] As a means of improving the performance of high Mn cast steel, improvement of mechanical properties has been studied. As a result, it has been reported that refinement of crystal grains is effective for improving mechanical properties. For example, I. Henych; Giesserei, Vol. 60 (1973) P453-P457, Muto et al .; Iron and Steel, Vol. 42 (1956) P873-P874;
Electric Steelmaking, Vol. 33, No. 4, (1962) P248-P26
There are 9 mag reports. These reports are 0.9-1.3%
C, a steel grade having a composition of 11 to 14% Mn (JIS G5131
Equivalent), refine the crystal grains of high Mn cast steel,
This improves the mechanical properties of the high Mn cast steel. The grain refinement was performed by lowering the casting temperature or increasing the cooling rate. However, these methods did not improve the wear resistance of the high Mn cast steel.

Therefore, in order to improve the wear resistance, the aforementioned JI
A 16-32% Mn cast steel in which the amount of C is increased and an appropriate amount of Mn is adjusted from a high Mn cast steel equivalent to SG5131 has been developed. Further, high Mn cast steels having improved wear resistance by adding carbide forming elements such as Cr, Mo, and V have been developed. For example, Japanese Patent Publication Nos. 57-17937, 63-8181, 1-14303, and 2-
15623, JP-A-62-139855, JP-A-1-1-1
No. 42058, and the like.

[0005] JIS G51 used for crusher liner materials (for example, the maximum thickness of the ingot is 40 to 150 mm)
The crystal grain size of 11 to 14% Mn cast steel equivalent to 31 is a coarse grain size of about 1 mm. 16-32% Mn of high alloy
The crystal grain size of the cast steel is 11-14 corresponding to JIS G 5131.
% Mn tends to be larger than the grain size of cast steel. It is known that lowering the casting temperature is effective for refining crystal grains.
It is difficult to lower the casting temperature due to problems such as ladle maintenance).

[0006] 1.0 to 2.
0% C-16 to 25% Mn steel, substantially 1.6 to 1.
Casting temperature of 9% C-19-22% Mn steel is 1390-1
It is stated that between 460 ° C. is suitable. It is described that the casting temperature is varied depending on the alloy composition of the Mn steel and the mold, and the casting temperature should be as low as practical. The liquidus temperature for this alloy composition is 1235-
It is estimated to be between 1385 ° C. When the casting temperature and the minimum value of the liquidus temperature are compared with the maximum value of the casting temperature and the liquidus temperature, the temperature difference between the casting temperature and the liquidus temperature is 70%.
℃ is exceeded. Furthermore, 1.6 to 1.9%, which is a substantial alloy disclosed in Japanese Patent Publication No. 1-14303, C-19 to 22%
The liquidus temperature of the Mn steel is estimated to be between about 1250 to 1320 ° C., and in this case, it is estimated that the liquidus temperature exceeds 70 ° C. even at the lower casting temperature. It is higher than the casting temperature of the present invention.

[0007] These 16-32% Mn cast steels have a fine grain size other than the above-mentioned means for lowering the casting temperature in order to minimize the deterioration of mechanical properties and the difficulty of the production method due to the high alloying. The law has been considered. Ti, V, Nb, Zr,
A method for refining crystal grains by adding a refining element such as B has been studied and implemented. By this method, a high Mn cast steel having improved wear resistance has been put to practical use as a wear-resistant member subjected to impact. In particular, the performance of the crusher and the like has been improved by using it for wear-resistant members such as the crusher.

[0008]

However, even if these high Mn cast steels are used for wear-resistant members such as crushers, the life of wear-resistant members has not been satisfactory. In recent years, the demand for improving the processing capacity of crushers has become increasingly severe,
High Mn with strong wear resistance and sufficient wear resistance
At present, cast steel has not been obtained. The same applies to the field of wear-resistant members that receive other impacts. Therefore, the present invention
It is an object of the present invention to improve the wear resistance of a high Mn cast steel compared with conventional materials and to provide a high wear resistant high Mn cast steel for wear resistant members having a long life. Further, the present invention provides a method for producing a high wear resistant and high Mn cast steel having excellent wear resistance.

[0009]

In order to improve the wear resistance of a high Mn cast steel, the amount of work hardening, wear resistance and crystal grain of the high Mn cast steel are changed by changing the amounts of C and Mn of the high Mn cast steel. The relationship with the diameter was investigated. Furthermore, Si, Cr, T
The effects of the addition of i, Al, etc. were also studied. From these research results, it has been found that there is a good correlation between the amount of work hardening and wear resistance. Furthermore, it has been found that the high Mn cast steel increases the amount of work hardening by refining crystal grains. In particular, the amount of C is 1.1 to 1.6.
%, When the crystal grain size of the high Mn cast steel having a Mn content of 15.0 to 35.0% is 500 μm or less, the work hardening amount is significantly increased, and as a result, it has been found that the wear resistance can be significantly improved. . In addition, by adding Si, Cr, Ti, Al, etc. , 1.1-1.6% C-15.0-35.
It has been found that the grains of 0% Mn cast steel are refined to improve wear resistance.

The particle size dependence on the work hardening characteristics is a completely new finding. In general, high Mn cast steel is known to improve mechanical properties by reducing the crystal grain size, but it has not been known until now that work hardening properties are improved.

The invention of claim 1 is based on the above findings. That is, in the invention according to claim 1, C: 1.1-1.6% and Si: 0.3-% by weight%.
1.0%, Mn: 15.0 to 35.0%, Cr: 5.0
% Or less (not including 0%), and Ti, Al
High wear resistance high Mn containing 0.01 to 0.6% of one or both of the above, and the balance being Fe and inevitable impurity elements.
Cast steel, characterized in that the average crystal grain size is 50 to 500 μm. By setting the average crystal grain size of the high wear-resistant high Mn cast steel to 50 to 500 μm, the work hardening characteristics are improved, and the wear resistance can be improved. In a high wear resistant and high Mn cast steel having an average crystal grain size of less than 50 μm, the abrasive wear resistance is significantly reduced. further,
In order to obtain excellent wear resistance, it is preferable that the average grain size of the high wear resistant and high Mn cast steel be 100 to 300 μm. Also, by adding Ti and Al, high wear resistance
Fine grain of high Mn cast steel, further improving wear resistance
it can.

The reasons for limiting the component range of the high wear-resistant and high-Mn cast steel of the present invention will be described below. (A) C: l. With an increase in the C content of 1 to 1.6%, the frequency of occurrence of deformation twins due to stacking faults during deformation increases, and the crystal grain size dependence on work hardening characteristics increases. Therefore, if the C content is less than 1.1%, the required work hardening characteristics cannot be obtained even if the crystal grain size is 500 μm or less. Furthermore, the abrasion resistance is significantly reduced.
On the other hand, if the C content exceeds 1.6%, the toughness decreases, and cracks occur during the manufacture or use of the wear-resistant member, making the manufacture difficult. In addition, work hardening characteristics are not improved due to the occurrence of cracks in the wear-resistant member.

(B) Si: 0.3 to 1.0% In order to deoxidize the molten metal at the time of melting and ensure fluidity, it is necessary to add 0.3% or more of Si. Further, when the amount of Si is 1.
If it exceeds 0%, precipitation of carbides at crystal grain boundaries is promoted, and toughness decreases.

(C) Mn: 15.0-35.0% Mn increases the solid solubility limit of C, suppresses carbide precipitation in the cooling process of the water toughness treatment, and secures necessary ductility. Also, Mn
As the amount increases, the frequency of occurrence of deformation twins increases due to stacking faults during deformation, and the crystal grain size dependence on work hardening characteristics increases. Therefore, if the Mn content is less than 15.0%, the required work hardening characteristics cannot be obtained even if the crystal grain size is 500 μm or less. Furthermore, the wear resistance required for the wear-resistant member cannot be obtained. On the other hand, if the Mn content exceeds 35.0%, the toughness decreases, and the amount of carbide precipitation in the as-cast state increases, resulting in casting cracks.

(D) Cr: 5.0% or less (excluding 0%) Cr is an element effective for improving work hardening characteristics and abrasion resistance. preferable. If the Cr content exceeds 5.0%, carbide precipitation during casting and in the cooling process of the water toughness treatment becomes remarkable, and the toughness is significantly reduced.

(F) Either or both of Ti and Al: 0.01 to
The addition of 0.6% Ti and Al is effective for forming oxides, carbides or nitrides in the molten metal and refining crystal grains,
Further, it has the effect of suppressing carbide precipitation during the cooling process of the water toughness treatment. When one or both of Ti and Al are added in an amount of 0.01% or more, the effect is obtained.
Coarse inclusions are formed and toughness is reduced.

Next, the process which led to the knowledge of the present invention relating to crystal grains and work hardening characteristics will be described, and the present invention will be further described in detail. Fig. 3 shows the current JIS standard materials (SCM
nH11: 0.9 to 1.3% C-11 to 14% Mn steel)
1 shows the relationship between the service life of a cone crusher liner material and the amount of work hardening. The life ratio of the wear-resistant material is shown as a multiple of the service life of the cone crusher liner material having a work hardening amount of about 300 kgf / mm ² assuming that the service life thereof is 1. The service life was determined from the wear of the cone crusher liner material. As the amount of work hardening increases, the life of the cone crusher liner improves, and the amount of work hardening decreases by about 3
At 80 kgf / mm ² , the service life is doubled. As the amount of work hardening increases, the service life of the wear-resistant member improves. Thus, it was confirmed that the work hardening improves the wear resistance of the wear-resistant member. It was found that the correlation between the amount of work hardening and the service life of the wear-resistant member was higher than expected.

The amount of work hardening of the high Mn cast steel is effective for evaluating the service life due to wear of wear-resistant members of crushers such as cone crushers and jaw crushers. Furthermore, not only wear-resistant members for crushers, but also wear-resistant members to which impact is applied,
For example, drag chains are used as wear-resistant members for construction machinery.
As wear-resistant members for blast furnaces such as blades, buckets, bucket teeth, caterpillars, rail crossings, etc., they are also used to evaluate the wear amount of armature plates, bells and the like. Until now, in order to estimate the life of the wear-resistant members of the actual machine, the results were measured based on the measurement results of the proof stress and hardness after constant deformation of the high Mn cast steel used and the results of various wear tests at the laboratory level. Was. However, these test results do not always agree with the actual service life of the wear-resistant member, and the correlation between the measurement and the test results is still unclear. At present, it does not always agree with the test results of the actual machine.

Next, the effects of the alloy components (particularly, the amounts of C and Mn) and the crystal grain size of the high Mn cast steel on the work hardening characteristics were investigated in detail. As a test material, a steel type having a chemical composition shown in Table 1 was melted in a vacuum, and at a casting temperature shown in Table 2, an ingot of about 10 kgf (8
(5φ × 90φ × 140h). Then 110
A solution treatment was performed at 0 ° C. for 6 hours, followed by a water toughness treatment. Table 2 shows the crystal grain size of the obtained test material.

[0020]

[Table 1]

[0021]

[Table 2]

FIG. 1 shows the relationship between the crystal grain size of each sample and the amount of work hardening. Samples B, D and E indicated by black dots in FIG.
When the crystal grain size is 500 μm or less, the amount of work hardening remarkably increases. In particular, the amount of work hardening is remarkable when the crystal grain size is 300 μm or less. Samples B, D and E are high Mn cast steels having an Mn content of 20 to 24%. On the other hand, in Samples A and C indicated by white dots, the amount of work hardening increases as the crystal grain size decreases, but it is only slight. The sample A is a 1.2% C-12% Mn cast steel, and the sample C is a 1.7% C-32% Mn cast steel.

C and Mn are further added to a 12% Mn high Mn cast steel corresponding to JIS G5131, 20 to 24%
Work hardening characteristics can be remarkably improved by setting the crystal grain size of the Mn high Mn cast steel to 500 μm or less. As a result, the wear resistance of the high Mn cast steel can be improved, and the service life of the wear-resistant member to which an impact is applied can be improved.
Further, from this result and the test results (see Examples) described later, if the Mn content of the high Mn cast steel is in the range of 15.0 to 35.0%, the crystal grain size of the high Mn cast steel is set to 500 μm or less. As a result, it was confirmed that the work hardening amount was significantly increased.

The sample C having an Mn content of 32% could not obtain a sufficient work hardening amount because the C content was low at 1.7% and the test piece was cracked. The amount of work hardening did not increase. As a result, it was found that the C content of the high Mn cast steel is preferably 1.6% or less.

From the present study, it was found that one equivalent to JIS G5131
It has been found that 1 to 14% Mn cast steel cannot be expected to improve the work hardening characteristics due to the refinement of the crystal grain size. On the other hand, 15
It has been found that a high Mn cast steel of up to 35% Mn always shows a high work hardening amount by setting the crystal grain size to 500 μm or less.

The following can be considered as the cause. It is considered that the work hardening accompanying deformation of the Mn cast steel having a low Mn composition is caused by generation of stacking faults, while the work hardening of the Mn cast steel having a high Mn composition is caused by deformation twinning. When the crystal grain size is made fine, particularly 500 μm or less, this deformation twin tends to be formed in a very large amount by deformation. As a result, it is presumed that Mn cast steel having a high Mn composition has high work hardening characteristics. Therefore, the average crystal grain size is 500 μm
The present invention, which has the following, has a high work hardening amount, and has a wear resistant
It can be seen that the service life is prolonged when the battery is used. Claim
The invention described in Item 2 is based on the above findings.

Further, the present inventors have found that 1.1 to 1.6% C
A method for reducing the crystal grain size of the high wear-resistant and high-Mn cast steel containing -15.0 to 35.0% Mn as a main component to 500 µm or less was studied. The liquidus temperature of this high wear resistant high Mn cast steel +70
It has been found that by casting at a temperature of not more than ℃, the crystal grain size can be rapidly reduced, and the crystal grain size can be reduced to 500 μm or less. To adopt the liquidus temperature + 70 ℃ below pouring temperature, be carried out prevention method of casting defects were confirmed to be effective. As one of the methods for preventing casting defects, an optimization design of a riser, a runner, a mold, and the like was performed, and the casting was performed by a downward pouring method.

The invention according to claim 3 is based on the above findings. 1.1 to 1.6% C-15.0 to 35.0%
In the method for producing a Mn cast steel, the casting temperature of the molten metal of the high wear-resistant high Mn cast steel is set to a temperature range higher by 10 to 70 ° C. than the liquidus temperature of the high wear-resistant high Mn cast steel. It is.

Next, the research process which led to the present invention will be described. As described above, a casting temperature higher than the liquidus temperature + 70 ° C. is usually adopted with emphasis on manufacturing problems (productivity, ladle maintenance, etc.). If the casting temperature is lowered, casting defects are likely to occur, and the flowability of the molten metal also deteriorates. Therefore, a casting temperature higher than the liquidus temperature + 70 ° C is adopted.

By implementing measures to prevent casting defects, it was considered that the lower limit of the casting temperature of the high-alloy 15-35% Mn cast steel would be the temperature at which the flow of the molten metal becomes poor. In other words, if measures are taken to prevent casting defects, it becomes possible to lower the casting temperature to a temperature at which the flow of the molten metal becomes poor.

The relationship between the crystal grain size of the high Mn cast steel and the casting temperature is shown in Table 2 and FIG. FIG. 2 shows the relationship between the crystal grain size of the high Mn cast steel and the temperature difference between the casting temperature and the liquidus temperature, in which the casting temperature is arranged according to the liquidus temperature of the high Mn cast steel. It has been found that by casting at a liquidus temperature of + 70 ° C. or lower, the crystal grains of the high Mn cast steel are remarkably refined. In addition, the liquidus temperature of the high wear resistant high Mn cast steel is 1
At a casting temperature of less than 0 ° C., it was confirmed that the flowability of the molten metal was extremely deteriorated. As described above, by implementing the measures for preventing casting defects, it is possible to set the casting temperature of the molten metal of the high Mn cast steel to a temperature range higher by 10 to 70 ° C. than the liquidus temperature of the high Mn cast steel. became.

The high wear resistant and high Mn cast steel of the present invention is applied to a wear resistant member subjected to heavy impact and severe wear, for example, a liner material of a crusher such as a cone crusher or a jaw crusher for crushing rock. This can dramatically extend the service life. Usually, the maximum thickness of the ingot of the wear-resistant member of these crushers is 40 to 150 mm.
In order to reduce the crystal grain size of such an ingot to 500 μm or less, the liquidus temperature of the high wear-resistant and high-Mn cast steel is set to 10-7
This is made possible by casting at a higher temperature range of 0 ° C.

[0033]

EXAMPLE A steel type having a chemical composition shown in Table 3 was melted in vacuum, and a liner for a crusher was produced at a casting temperature shown in Table 3. Trial
The chemical composition and casting temperature of the material I correspond to the present invention. That
The casting temperature is in the range of about 20 to 50 ° C higher than the liquidus temperature.
Is within. Samples A1, B1, B2, F, G, H were compared
It is an example. Samples B2, F, G, and H correspond to the present invention and the chemical composition.
The casting temperature is about 20 degrees below the liquidus temperature of each steel type.
温度 50 ° C. higher temperature range. Samples A1 and B1
The invention also differs in chemical composition and casting temperature. Its casting temperature
Adopts a temperature about 80 ° C higher than the liquidus temperature of each steel type.
Was. Thereafter, a solution treatment was performed at 1100 ° C. for 6 hours, and then a water toughness treatment was performed. The crystal grain size and work hardening amount of these samples were measured.

[0034]

[Table 3]

Test pieces for measuring the crystal grain size and compression test pieces for investigating the work hardening characteristics were collected from the respective ingots. The sampling position of the test piece is a position where the thickness of the ingot is maximum, and is within a range of １ ／ of the thickness from the center of the thickness. The crystal grain size was measured by a cutting method (see JIS: G0552). In this method, a test piece is polished, and the polished surface is measured by microscopic observation. A lattice is drawn on the lens of the microscope, and the line segment of the lattice is measured by counting the number of cut crystal grains.

The amount of work hardening was measured at room temperature by performing a compression test on a test piece of 8φ × 12 h at a strain rate of 10 ⁻³ / s. The amount of work hardening was evaluated by the deformation resistance at a constant strain amount in the compression test. Since the hardness of the test piece at the time when the strain amount was 50% corresponded to the hardness of the wear surface of the cone crusher liner material of the actual machine, the measurement was performed at the strain amount of 50%.

Table 4 shows the measurement results of the crystal grain size and the work hardening amount. The crystal grain size of the samples A1 and B1 having a high casting temperature exceeding the liquidus temperature + 70 ° C. is close to 1 mm. On the other hand, the crystal grain sizes of samples B2, F, G, H and I whose casting temperature is equal to or lower than the liquidus temperature + 70 ° C. are 500 μm.
It is as follows. By adopting a casting temperature of liquidus temperature + 70 ° C. or less, the crystal grain size of the liner for the crusher is 500
μm or less. The amount of work hardening of samples A1 and B1 is about 3
The amount of work hardening of samples B2, F, G, H and I is about 360 kgf / mm ² or more with respect to 10 kgf / mm ² .

[0038]

[Table 4]

Using the liner of the above sample, a rock crushing test was conducted by a cone crusher. Table 4 shows the test results obtained by the cone crusher. Rock crushing charge is J
In sample A1 corresponding to ISG5131, the amount was 41,000 tons. Sample I Liner for Cone Crusher of Sample I
-The service life of the material is the same as that of sample A1 corresponding to JIS G5131.
2.5 times. The average crystal grain size is the same as in the present invention.
Although it is in the range of 50 to 500 μm, the present invention and the chemical composition
The different samples B2, F, G and H are also compared with the sample I of the present invention.
And the service life is short.

[0040]

As described above, according to the first aspect of the present invention , C: 1.1 to 1.6% by weight,
Si: 0.3 to 1.0%, Mn: 15.0 to 35.0
%, Cr: not more than 5.0% (not including 0%),
Further, one or both of Ti and Al are contained in% by weight.
By setting the average grain size of the high wear-resistant high Mn cast steel to 0.01 to 0.6% to 50 to 500 μm, the work hardening characteristics of the high wear-resistant high Mn cast steel can be improved, Abrasion can be improved. The service life of the wear-resistant member using the high wear-resistant high Mn cast steel can be improved. In addition, by setting the average grain size of the high wear-resistant high Mn cast steel to 50 to 500 μm, as in the conventionally developed high Mn cast steel,
It is possible to obtain a high wear-resistant and high-Mn cast steel which is inexpensive and has excellent wear resistance without adding a large amount of alloying elements. Further, adding elements such as Ti and Al
By this, the crystal grains of the high wear resistant and high Mn cast steel are refined.
To improve work hardening characteristics and improve wear resistance.
It is possible to make it rise .

According to a second aspect of the present invention, there is provided a crusher such as a cone crusher or a jaw crusher for crushing the high wear-resistant high Mn cast steel, which is subjected to heavy impact and severe wear, such as rock. By applying the present invention to the liner material, it is possible to dramatically extend the service life thereof.

According to a third aspect of the present invention, in the method for producing a high wear-resistant high Mn cast steel, the casting temperature of the molten metal of the high wear-resistant high Mn cast steel is a liquidus line of the high wear-resistant high Mn cast steel. By setting the temperature range 10 to 70 ° C. higher than the temperature, it becomes possible to produce the high wear-resistant and high-Mn cast steel having an average crystal grain size of 50 to 500 μm.

The invention according to claim 4 is characterized in that the maximum thickness of the ingot of the high wear resistant and high Mn cast steel is set to 40 to 150 mm so that the high wear resistant high used for a wear resistant member such as a crusher. It is possible to produce Mn cast steel.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between an average crystal grain size and a work hardening amount.

FIG. 2 is a diagram showing the effect of the temperature difference between the casting temperature and the liquidus temperature on the average crystal grain size.

FIG. 3 is a diagram showing the relationship between the service life of a cone crusher liner material and the amount of work hardening.

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroyuki Uchida 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kobe Steel, Ltd.Kobe Research Institute (72) Inventor Koji Minagawa Takasago City, Hyogo Prefecture 2-3-1, Niihama, Arai-cho Kobe Steel, Ltd.Takasago Works (72) Inventor Takeshi Takeshi 88-81, Fuminashi-cho, Yonago-shi, Tottori Prefecture Yonago Steel Co., Ltd. (72) Inventor Toshinao Nakai Tomitori-cho, Yonago-shi, Tottori 88-1 Yonago Steel Co., Ltd. (56) References JP-A-2-310337 (JP, A) JP-A-1-142058 (JP, A) JP-A-62-139855 (JP, A) JP-A-60 -77962 (JP, A) JP-A-57-39158 (JP, A) JP-A-54-104418 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C22C 38/00- 38/60

Claims (4)

(57) [Claims] C .: 1.1 to 1.6% by weight, S:
i: 0.3 to 1.0%, Mn: 15.0 to 35.0%,
Cr: 5.0% or less (excluding 0%), and further, one or both of Ti and Al are contained in an amount of 0.01 to 0.1%.
A high wear resistant and high Mn cast steel containing 6%, with the balance being Fe and unavoidable impurity elements, having an average crystal grain size of 50 to 50
High wear resistant and high Mn cast steel characterized by being 0 μm. 2. The high wear resistant and high Mn cast steel according to claim 1, which is used for a wear resistant member such as a crusher. 3. The method for producing a high wear-resistant, high Mn cast steel according to claim 1 , wherein the casting temperature of the molten metal of the high wear-resistant, high Mn cast steel into a mold is a liquid phase of the high wear-resistant, high Mn cast steel. A method for producing a high wear resistant and high Mn cast steel, wherein the temperature range is 10 to 70 ° C. higher than the linear temperature. 4. The method for producing a high wear-resistant high Mn cast steel according to claim 3 , wherein a maximum thickness portion of the ingot of the high wear-resistant high Mn cast steel is set to 40 to 150 mm. A method for producing a high wear resistant and high Mn cast steel used for wear resistant members such as crushers.