A casting and melting process for M35-1 material

Abstract

The present invention relates to a casting and smelting process of M35-1 material, and belongs to the technical field of alloy casting. The present invention creatively divides the smelted liquid into two parts in the casting and smelting process of M35-1 material, one part is kept at a constant temperature, and the other part is cooled, and then a mixture composed of graphite and calcium is added to the smelting liquid of the cooling part for pre-degassing, and then the smelting liquid of the constant temperature part is added to remix, and the temperature is raised for secondary smelting, and a mixture composed of silicon calcium manganese, rare earth ferrosilicon alloy and FeTi70-A is used as a degasser for final degassing, and oxygen is further removed, and finally after slag removal, pouring, cooling, and polishing steps, an M35-1 material is obtained, which has a lower oxygen content, effectively improves the formation of pores and the generation of inclusions on the grain boundaries of the M35-1 material during solidification caused by residual gas, and the quality of the casting is more excellent.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy casting, and in particular relates to a casting and melting process of an M35-1 material. Background Art

[0002] Monel alloy, also known as nickel alloy, is an alloy based on nickel metal and added with other elements such as copper, iron, and manganese. It has excellent properties such as good corrosion resistance and easy brazing, and is widely used in chemical industry, shipbuilding and other fields. Among them, M35-1 material is a kind of monel alloy. Compared with ordinary monel alloy, it has more outstanding performance and very high use value. However, M35-1 material is difficult to produce in actual production, and a slight change in composition may have an adverse effect on its performance. In particular, from the perspective of the main components, the Ni and Cu components in the M35-1 material are very easy to oxidize and absorb air during the smelting process, which leads to the formation of a large number of pores and / or a large number of inclusions on the grain boundaries during solidification, which ultimately seriously affects the performance of the M35-1 material and reduces the quality of the casting. Therefore, it is of practical significance to provide a process for casting and smelting M35-1 material with low oxygen content. Summary of the invention

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a casting and smelting process for M35-1 material. In the casting and smelting process for M35-1 material, the present invention creatively divides the smelted molten liquid into two parts after smelting, one part is kept at a constant temperature, and the other part is cooled, then a mixture composed of graphite and calcium is added to the molten liquid in the cooling part for pre-degassed, and then the molten liquid in the constant temperature part is added to remix, and the temperature is raised for smelting for a second time, and a mixture composed of silicon calcium manganese, rare earth silicon iron alloy and FeTi70-A is used as a degassing agent for final degassing to further remove oxygen, and finally after slag removal, pouring, cooling and polishing steps, an M35-1 material with a lower oxygen content is obtained, which effectively improves the formation of pores and the generation of inclusions on the grain boundaries of the M35-1 material during solidification caused by residual gas, and the quality of the casting is better.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A M35-1 material casting and melting process, the M35-1 material casting and melting process comprising the following steps:

[0006] (1) Material preparation: batching and mixing according to the chemical composition of material M35-1 to obtain material A;

[0007] (2) Melting: introducing an inert gas into a medium frequency induction melting furnace, then adding the material A, heating and melting to obtain a molten liquid A, and dividing the molten liquid A into two parts to obtain a molten liquid A1 and a molten liquid A2;

[0008] (3) Pre-degassing: the smelting liquid A2 is kept at a constant temperature; the smelting liquid A1 is cooled, and after the cooling is completed, a carbon-calcium mixture of 0.3-0.5% by weight of the smelting liquid A is added, and the temperature is kept for 3-5 minutes, and finally the smelting liquid A2 is added to obtain a smelting liquid B;

[0009] (4) Secondary smelting: heating the smelting liquid B to obtain smelting liquid C;

[0010] (5) Final degassing: adding a degassing agent in an amount of 0.1-0.3% by weight of the smelting liquid C to the smelting liquid C at a constant temperature for degassing for 15-30 minutes, removing slag, and obtaining a smelting liquid D;

[0011] (6) Pouring: The molten liquid D is cooled, poured into a casting mold, naturally cooled to room temperature, and polished, and the process is completed.

[0012] As a preferred technical solution of the present invention, the chemical composition of step (1) is as follows: by wt%, C≦0.35%; Si≦1.25%; Mn≦1.5%; P≦0.03%; S≦0.02%; Cu=26-33%; Fe≦3.5%; Nb≦0.5%; the remainder is Ni.

[0013] As a preferred technical solution of the present invention, the inert gas in step (2) is argon, and the flow rate of the inert gas is 10-15 lpm.

[0014] As a preferred technical solution of the present invention, the heating and melting in step (2) refers to heating to 1620-1650°C at a rate of 20-25°C / min and melting for 10-15 minutes.

[0015] As a preferred technical solution of the present invention, the weight of the smelting liquid A1 in step (2) is 25-35% of the smelting liquid A.

[0016] As a preferred technical solution of the present invention, the cooling in step (3) refers to cooling to 900-1000°C at a rate of 10-15°C / min.

[0017] As a preferred technical solution of the present invention, the carbon-calcium mixture in step (3) is a mixture of graphite and calcium, and the weight ratio of the graphite to the calcium is 7-8:2-4.

[0018] As a preferred technical solution of the present invention, the heating and melting in step (4) refers to heating to 1620-1650°C at a rate of 20-25°C / min and melting for 5-10 minutes.

[0019] As a preferred technical solution of the present invention, the degassing agent in step (5) is a mixture of silicon calcium manganese, rare earth ferrosilicon alloy and FeTi70-A, and the weight ratio of the silicon calcium manganese, the rare earth ferrosilicon alloy and the FeTi70-A is 5-8:3-4:1-2.

[0020] As a preferred technical solution of the present invention, the cooling in step (6) refers to cooling to 1470-1500°C at a rate of 5-10°C / min.

[0021] As a preferred technical solution of the present invention, the grinding in step (6) refers to grinding away a surface layer with a thickness of 0.1-0.3 mm.

[0022] Beneficial effects of the present invention:

[0023] (1) The present invention creatively divides the molten liquid into two parts in the casting and smelting process of the M35-1 material, one part is kept at a constant temperature, and the other part is cooled. Then, a mixture of graphite and calcium is added to the molten liquid in the cooled part for pre-degassed, and then the molten liquid in the constant temperature part is added to remix them, and the temperature is raised for smelting for the second time. A mixture of silicon calcium manganese, rare earth silicon iron alloy and FeTi70-A is used as a degassing agent for final degassing to further remove oxygen. Finally, after the steps of slag removal, pouring, cooling and polishing, an M35-1 material with a lower oxygen content is obtained, which effectively improves the formation of pores and the generation of inclusions on the grain boundaries of the M35-1 material during solidification caused by residual gas, and the quality of the casting is better.

[0024] (2) The present invention creatively divides the smelting liquid into two parts after smelting, one part is kept at a constant temperature, and the other part is cooled. At the same time, a certain weight ratio of graphite and calcium is added to the smelting liquid in the cooled part to perform pre-degassing. When the addition is just started, graphite plays a leading role. Graphite is carbon, which has a strong deoxidation ability and can combine with oxygen to escape and be removed in the form of carbon monoxide. When the smelting liquid in the constant temperature part is added again and the secondary smelting is performed, the temperature of the system begins to gradually increase. Based on the high vapor pressure of calcium, calcium gradually evaporates and becomes calcium vapor. Since calcium vapor has a strong binding energy with oxygen, it can play a deoxidation role. Through the separation of smelting liquid - constant temperature / cooling - addition of graphite and calcium - The remixing and heating method allows calcium to evaporate from the inside of the system and gradually escape to the surface in the form of free diffusion, which greatly increases the probability of contact with oxygen and better achieves the deoxidation effect. In addition, after the secondary smelting, the present invention also adds a mixture of silicon calcium manganese, rare earth silicon iron alloy and FeTi70-A in a certain weight ratio as a degassing agent for final degassing. FeTi70-A can undergo a large amount of oxidation reaction in the molten state. Through the synergistic effect of the three, the possible residual oxygen can be further removed. Finally, after the steps of slag removal, pouring, cooling and polishing, an M35-1 material is obtained, which has a low oxygen content, effectively reduces the formation of pores and inclusions in the material, and the casting quality is better. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0026] Example 1

[0027] A M35-1 material casting and melting process, the M35-1 material casting and melting process comprising the following steps:

[0028] (1) Material preparation: batching and mixing according to the chemical composition of material M35-1 to obtain material A;

[0029] (2) Melting: introducing an inert gas into a medium frequency induction melting furnace, then adding the material A, heating and melting to obtain a molten liquid A, and dividing the molten liquid A into two parts to obtain a molten liquid A1 and a molten liquid A2;

[0030] (3) Pre-degassing: the temperature of the molten liquid A2 is kept constant; the temperature of the molten liquid A1 is cooled, and after the cooling is completed, a carbon-calcium mixture of 0.3% by weight of the molten liquid A is added, and the temperature is kept for 3 minutes, and finally the molten liquid A2 is added to obtain a molten liquid B;

[0031] (4) Secondary smelting: heating the smelting liquid B to obtain smelting liquid C;

[0032] (5) Final degassing: adding a degassing agent in an amount of 0.1% by weight of the smelting liquid C to the smelting liquid C at a constant temperature for degassing for 15 minutes, removing slag, and obtaining a smelting liquid D;

[0033] (6) Pouring: The molten liquid D is cooled, poured into a casting mold, naturally cooled to room temperature, and polished, and the process is completed.

[0034] The chemical composition of step (1) is as follows: by wt%, C=0.35%; Si=1.25%; Mn=1.5%; P=0.03%; S=0.02%; Cu=26%; Fe=3.5%; Nb=0.5%; and the balance is Ni.

[0035] The inert gas in step (2) is argon, and the flow rate of the inert gas is 10 lpm.

[0036] The heating and smelting in step (2) refers to heating to 1620° C. and smelting for 10 min at a rate of 20° C. / min.

[0037] In step (2), the weight of the smelting liquid A1 is 25% of the smelting liquid A.

[0038] The cooling in step (3) refers to cooling to 900°C at a rate of 10°C / min.

[0039] The carbon-calcium mixture in step (3) is a mixture of graphite and calcium, and the weight ratio of the graphite to the calcium is 7:2.

[0040] The heating and smelting in step (4) refers to heating to 1620°C at a rate of 20°C / min and smelting for 5 minutes.

[0041] The degassing agent in step (5) is a mixture of silicon calcium manganese, rare earth ferrosilicon alloy and FeTi70-A, and the weight ratio of the silicon calcium manganese, the rare earth ferrosilicon alloy and the FeTi70-A is 5:3:1.

[0042] The cooling in step (6) refers to cooling to 1470°C at a rate of 5°C / min.

[0043] The grinding in step (6) refers to grinding away the surface layer with a thickness of 0.1 mm.

[0044] Example 2

[0045] A M35-1 material casting and melting process, the M35-1 material casting and melting process comprising the following steps:

[0046] (1) Material preparation: batching and mixing according to the chemical composition of material M35-1 to obtain material A;

[0047] (2) Melting: introducing an inert gas into a medium frequency induction melting furnace, then adding the material A, heating and melting to obtain a molten liquid A, and dividing the molten liquid A into two parts to obtain a molten liquid A1 and a molten liquid A2;

[0048] (3) Pre-degassing: the temperature of the molten liquid A2 is kept constant; the temperature of the molten liquid A1 is cooled, and after the cooling is completed, a carbon-calcium mixture of 0.5% by weight of the molten liquid A is added, and the temperature is kept for 5 minutes, and finally the molten liquid A2 is added to obtain a molten liquid B;

[0049] (4) Secondary smelting: heating the smelting liquid B to obtain smelting liquid C;

[0050] (5) Final degassing: adding a degassing agent in an amount of 0.3% by weight of the smelting liquid C to the smelting liquid C at a constant temperature for degassing for 30 minutes, removing slag, and obtaining a smelting liquid D;

[0051] (6) Pouring: The molten liquid D is cooled, poured into a casting mold, naturally cooled to room temperature, and polished, and the process is completed.

[0052] The chemical composition of step (1) is as follows: by wt%, C=0.35%; Si=1.25%; Mn=1.5%; P=0.03%; S=0.02%; Cu=33%; Fe=3.5%; Nb=0.5%; and the balance is Ni.

[0053] The inert gas in step (2) is argon, and the flow rate of the inert gas is 15 lpm.

[0054] The heating and melting in step (2) refers to heating to 1650° C. and melting for 15 minutes at a rate of 25° C. / min.

[0055] In step (2), the weight of the smelting liquid A1 is 35% of the smelting liquid A.

[0056] The cooling in step (3) refers to cooling to 1000° C. at a rate of 15° C. / min.

[0057] The carbon-calcium mixture in step (3) is a mixture of graphite and calcium, and the weight ratio of the graphite to the calcium is 8:4.

[0058] The heating and smelting in step (4) refers to heating to 1650°C at a rate of 25°C / min and smelting for 10 minutes.

[0059] The degassing agent in step (5) is a mixture of silicon calcium manganese, rare earth ferrosilicon alloy and FeTi70-A, and the weight ratio of the silicon calcium manganese, the rare earth ferrosilicon alloy and the FeTi70-A is 8:4:2.

[0060] The cooling in step (6) refers to cooling to 1500°C at a rate of 10°C / min.

[0061] The grinding in step (6) refers to grinding away a surface layer with a thickness of 0.3 mm.

[0062] Example 3

[0063] A M35-1 material casting and melting process, the M35-1 material casting and melting process comprising the following steps:

[0064] (1) Material preparation: batching and mixing according to the chemical composition of material M35-1 to obtain material A;

[0065] (2) Melting: introducing an inert gas into a medium frequency induction melting furnace, then adding the material A, heating and melting to obtain a molten liquid A, and dividing the molten liquid A into two parts to obtain a molten liquid A1 and a molten liquid A2;

[0066] (3) Pre-degassing: the temperature of the molten liquid A2 is kept constant; the temperature of the molten liquid A1 is cooled, and after the cooling is completed, a carbon-calcium mixture of 0.4% by weight of the molten liquid A is added, and the temperature is kept for 4 minutes, and finally the molten liquid A2 is added to obtain a molten liquid B;

[0067] (4) Secondary smelting: heating the smelting liquid B to obtain smelting liquid C;

[0068] (5) Final degassing: adding a degassing agent in an amount of 0.2% by weight of the smelting liquid C to the smelting liquid C at a constant temperature for degassing for 20 minutes, removing slag, and obtaining a smelting liquid D;

[0069] (6) Pouring: The molten liquid D is cooled, poured into a casting mold, naturally cooled to room temperature, and polished, and the process is completed.

[0070] The chemical composition of step (1) is as follows: by wt%, C=0.35%; Si=1.25%; Mn=1.5%; P=0.03%; S=0.02%; Cu=30%; Fe=3.5%; Nb=0.5%; and the balance is Ni.

[0071] The inert gas in step (2) is argon, and the flow rate of the inert gas is 13 lpm.

[0072] The heating and smelting in step (2) refers to heating to 1640° C. and smelting for 13 minutes at a rate of 22° C. / min.

[0073] In step (2), the weight of the smelting liquid A1 is 30% of the smelting liquid A.

[0074] The cooling in step (3) refers to cooling to 950° C. at a rate of 13° C. / min.

[0075] The carbon-calcium mixture in step (3) is a mixture of graphite and calcium, and the weight ratio of the graphite to the calcium is 7.5:3.

[0076] The heating and smelting in step (4) refers to heating to 1630° C. and smelting for 8 minutes at a rate of 23° C. / min.

[0077] The degassing agent in step (5) is a mixture of silicon calcium manganese, rare earth ferrosilicon alloy and FeTi70-A, and the weight ratio of the silicon calcium manganese, the rare earth ferrosilicon alloy and the FeTi70-A is 6:3.5:1.5.

[0078] The cooling in step (6) refers to cooling to 1480°C at a rate of 8°C / min.

[0079] The grinding in step (6) refers to grinding away a surface layer with a thickness of 0.2 mm.

[0080] Comparative Example 1

[0081] Based on Example 1, the graphite in the carbon-calcium mixture was replaced with an equal weight of calcium, and the rest remained unchanged.

[0082] Comparative Example 2

[0083] Based on Example 1, the calcium in the carbon-calcium mixture was replaced by an equal weight of graphite, and the rest remained unchanged.

[0084] Comparative Example 3

[0085] On the basis of Example 1, the silicon, calcium and manganese in the degassing agent are replaced with rare earth ferrosilicon alloy of equal weight, and the rest remain unchanged.

[0086] Comparative Example 4

[0087] On the basis of Example 1, the silicon, calcium and manganese in the degassing agent are changed to FeTi70-A with equal weight, and the rest remain unchanged.

[0088] Comparative Example 5

[0089] On the basis of Example 1, the rare earth ferrosilicon alloy in the degassing agent is replaced with silicon, calcium and manganese of equal weight, and the rest remains unchanged.

[0090] Comparative Example 6

[0091] On the basis of Example 1, the rare earth ferrosilicon alloy in the degassing agent is replaced with FeTi70-A of equal weight, and the rest remains unchanged.

[0092] Comparative Example 7

[0093] On the basis of Example 1, FeTi70-A in the degassing agent is replaced with silicon, calcium and manganese of equal weight, and the rest remain unchanged.

[0094] Comparative Example 8

[0095] On the basis of Example 1, FeTi70-A in the degassing agent is replaced with rare earth ferrosilicon alloy of equal weight, and the rest remains unchanged.

[0096] Comparative Example 9

[0097] Based on Example 1, no carbon-calcium mixture is added in step (3), and the rest remain unchanged.

[0098] Comparative Example 10

[0099] Based on Example 1, no degassing agent is added in step (5), and the rest remain unchanged.

[0100] Comparative Example 11

[0101] On the basis of Example 1, step (2) is changed to smelting: an inert gas is introduced into a medium frequency induction smelting furnace, and then the material A is added, the temperature is increased for smelting, and a smelting liquid A is obtained; step (3) is changed to cooling the smelting liquid A, and after the cooling is completed, a carbon-calcium mixture with a weight of 0.3% of the smelting liquid A is added, and the temperature is kept for 3 minutes to obtain a smelting liquid B; the rest remains unchanged.

[0102] Comparative Example 12

[0103] On the basis of Example 1, step (2) is changed to smelting: an inert gas is introduced into a medium frequency induction smelting furnace, and then the material A is added, the temperature is increased for smelting, and a smelting liquid A is obtained; step (3) is changed to adding a carbon-calcium mixture whose weight is 0.3% of the smelting liquid A to the smelting liquid A, and the mixture is kept warm for 8 minutes to obtain a smelting liquid B; step (4) is not performed; in step (5), the smelting liquid C is changed to the smelting liquid B; and the rest remain unchanged.

[0104] Comparative Example 13

[0105] On the basis of Example 1, step (3) is changed to maintaining the temperature of the smelting liquid A2 constant; adding a carbon-calcium mixture of 0.3% by weight of the smelting liquid A to the smelting liquid A1, keeping the temperature for 3 minutes, and finally adding the smelting liquid A2 to obtain the smelting liquid B; the rest remains unchanged.

[0106] Test Example 1

[0107] Oxygen content test:

[0108] The oxygen content of the M35-1 materials obtained in Examples 1-3 and Comparative Examples 1-13 was tested respectively. The test method was carried out according to the description in the reference "Yu Yanpeng, Hu Shaocheng, Ma Hongquan, Wu Zhenning, Huang Xiaofeng, Hu Xueqiang, Wang Peng. Determination of oxygen, nitrogen and hydrogen in steel materials by pulse melting-infrared absorption thermal conductivity method [J]. Metallurgical Analysis, 2014, 34(10): 32-36."

[0109] Table 1. Oxygen content test results

[0110]

[0111]

[0112] Comparison between Example 1 and Comparative Examples 1-13 shows that:

[0113] The difference between Comparative Example 1 and Example 1 is that the graphite in the carbon-calcium mixture is replaced by an equal weight of calcium.

[0114] The difference between Comparative Example 2 and Example 1 is that the calcium in the carbon-calcium mixture is replaced by an equal weight of graphite.

[0115] The difference between Comparative Example 3 and Example 1 is that the silicon, calcium and manganese in the degassing agent are replaced by rare earth ferrosilicon alloy of equal weight.

[0116] The difference between Comparative Example 4 and Example 1 is that the silicon, calcium and manganese in the degassing agent are replaced by FeTi70-A of equal weight.

[0117] The difference between Comparative Example 5 and Example 1 is that the rare earth ferrosilicon alloy in the degassing agent is replaced by silicon, calcium and manganese of equal weight.

[0118] The difference between Comparative Example 6 and Example 1 is that the rare earth ferrosilicon alloy in the degassing agent is replaced by FeTi70-A of equal weight.

[0119] The difference between Comparative Example 7 and Example 1 is that FeTi70-A in the degassing agent is replaced by silicon, calcium and manganese of equal weight.

[0120] The difference between Comparative Example 8 and Example 1 is that FeTi70-A in the degassing agent is replaced by an equal weight of rare earth ferrosilicon alloy.

[0121] The difference between Comparative Example 9 and Example 1 is that no carbon calcium mixture is added for pre-degassing.

[0122] The difference between Comparative Example 10 and Example 1 is that no degassing agent is added for final degassing.

[0123] The difference between Comparative Example 11 and Example 1 is that the smelting liquid A is not divided into two parts before adding the carbon-calcium mixture, but is added after cooling.

[0124] The difference between Comparative Example 12 and Example 1 is that the smelting liquid A is not divided into two parts before adding the carbon-calcium mixture, and there is no process of adding after cooling.

[0125] The difference between Comparative Example 13 and Example 1 is that the carbon-calcium mixture is not added after the smelting liquid A1 is cooled.

[0126] From Test Example 1, it can be seen from the comparison between Example 1 and Comparative Examples 1-13 that the M35-1 material obtained by the M35-1 material casting and smelting process provided by the present invention has a low oxygen content, can effectively reduce the formation of pores and the generation of inclusions, and the casting quality is more excellent.

[0127] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A casting and smelting process of M35-1 material, characterized by: The M35-1 material casting and melting process comprises the following steps: (1) Material preparation: Prepare materials according to the chemical composition of material M35-1 and mix to obtain material A; (2) Melting: introducing an inert gas into a medium frequency induction melting furnace, then adding the material A, heating and melting to obtain a molten liquid A, and dividing the molten liquid A into two parts to obtain a molten liquid A1 and a molten liquid A2; (3) Pre-degassing: the temperature of the molten liquid A2 is kept constant; the temperature of the molten liquid A1 is cooled, and after the cooling is completed, a carbon-calcium mixture of 0.3-0.5% by weight of the molten liquid A is added, and the temperature is kept for 3-5 minutes, and finally the molten liquid A2 is added to obtain a molten liquid B; (4) Secondary smelting: heating the smelting liquid B to obtain smelting liquid C; (5) Final degassing: adding a degassing agent in an amount of 0.1-0.3% by weight of the smelting liquid C to the smelting liquid C at a constant temperature for degassing for 15-30 minutes, removing slag, and obtaining a smelting liquid D; (6) Pouring: Cool the molten liquid D, pour it into the casting mold, cool it naturally to room temperature, and polish it. The process is completed; The degassing agent in step (5) is a mixture of silicon calcium manganese, rare earth ferrosilicon alloy and FeTi70-A, and the weight ratio of the silicon calcium manganese, the rare earth ferrosilicon alloy and the FeTi70-A is 5-8:3-4:1-2.

2. The M35-1 material casting and smelting process according to claim 1 is characterized in that: The chemical composition of step (1) is as follows: by wt%, C≤0.35%; Si≤1.25%; Mn≤1.5%; P≤0.03%; S≤0.02%; Cu=26-33%; Fe≤3.5%; Nb≤0.5%; and the balance is Ni.

3. The M35-1 material casting and smelting process according to claim 1 is characterized in that: The heating and melting in step (2) refers to heating to 1620-1650°C at a rate of 20-25°C / min and melting for 10-15 minutes.

4. The casting and smelting process of M35-1 material according to claim 1, characterized in that: In step (2), the weight of the molten liquid A1 is 25-35% of the molten liquid A.

5. The M35-1 material casting and smelting process according to claim 1 is characterized in that: The cooling in step (3) refers to cooling to 900-1000°C at a rate of 10-15°C / min.

6. The M35-1 material casting and smelting process according to claim 1, characterized in that: The carbon-calcium mixture in step (3) is a mixture of graphite and calcium, and the weight ratio of the graphite to the calcium is 7-8:2-4.

7. The casting and smelting process of M35-1 material according to claim 1, characterized in that: The heating and melting in step (4) refers to heating to 1620-1650°C at a rate of 20-25°C / min and melting for 5-10 minutes.

8. The M35-1 material casting and smelting process according to claim 1, characterized in that: The cooling in step (6) refers to cooling to 1470-1500°C at a rate of 5-10°C / min.

9. The casting and smelting process of M35-1 material according to claim 1, characterized in that: The grinding in step (6) refers to grinding away the surface layer with a thickness of 0.1-0.3 mm.

Images