Rare earth element doped and multi-component microalloyed cylinder sleeve cast iron based on Tarkall-C alloy and preparation method of rare earth element doped and multi-component microalloyed cylinder sleeve cast iron

Abstract

The invention discloses rare earth element doped and multi-component microalloyed cylinder sleeve cast iron based on Tarkall-C alloy and a preparation method of the rare earth element doped and multi-component microalloyed cylinder sleeve cast iron, and belongs to the field of ship low-speed engines. The invention aims to solve the problems that the gray cast iron is easy to abrade and damage due to surface fatigue under the working conditions of high cylinder temperature, high load and low speed. The rare earth element doped and multi-component microalloyed cylinder liner cast iron based on the Tarkall-C alloy is composed of rare earth elements, Ni, Cr, Mo, V, Nb, C, Si, Mn, P, S, Cu and the balance Fe. The method comprises the steps of 1, modeling; 2, weighing; 3, smelting; 4, inoculation; and 5, pouring. The rare earth element doped and multi-component microalloyed cylinder sleeve cast iron based on the Tarkall-C alloy and the preparation method of the cylinder sleeve cast iron are provided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of low-speed engine of ship. BACKGROUND

[0002] Gray cast iron is a multi-element iron-based alloy mainly composed of Fe-C-Si, which has been widely used in friction and wear parts such as cylinder liners of low-speed engines of ships as a traditional material. Its main advantages are low cost, good castability, moderate strength and wear resistance. However, with the increasing demand for engine performance in the shipbuilding industry, especially the demand for low friction, low energy consumption and long service life, the traditional gray cast iron gradually exposes its shortcomings in terms of friction and wear performance. Specifically, under the working conditions of high cylinder temperature, high load and low speed, gray cast iron is prone to accelerated wear and surface fatigue damage, which leads to shortened service life of the cylinder liner, increased energy consumption and increased maintenance frequency. Moreover, the high-temperature strength of gray cast iron decreases rapidly above 400℃, and the spheroidization of pearlite matrix and the decomposition of cementite lead to a sharp decline in the friction and wear performance of gray cast iron cylinder liners, which further causes engine failure due to cylinder scoring and seriously affects the service life and safety of the parts. SUMMARY

[0003] The present application aims to solve the problem of accelerated wear and surface fatigue damage of gray cast iron under the working conditions of high cylinder temperature, high load and low speed, and further provides a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy and a preparation method thereof.

[0004] A rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy, which is composed of 0.026%~0.032% rare earth elements, 0.099%~0.121% Ni, 0.108%~0.132% Cr, 0.081%~0.099% Mo, 0.067%~0.082% V, 0.108%~0.132% Nb, 2.565%~3.135% C, 0.954%~1.166% Si, 0.747%~0.913% Mn, 0.284%~0.347% P, 0.026%~0.032% S, 1.152%~1.408% Cu and the balance of Fe by mass percentage;

[0005] The rare earth element is La or Ce.

[0006] A preparation method of a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy, which is carried out according to the following steps:

[0007] I. Molding:

[0008] The sand mixing, compacting and mold stripping are completed, then the mold is closed and locked at the mold closing station, and the pouring and gating are set;

[0009] II. Weighing:

[0010] The raw materials are weighed according to the rare earth elements of 0.026% to 0.032%, 0.099% to 0.121% of Ni, 0.108% to 0.132% of Cr, 0.081% to 0.099% of Mo, 0.067% to 0.082% of V, 0.108% to 0.132% of Nb, 2.565% to 3.135% of C, 0.954% to 1.166% of Si, 0.747% to 0.913% of Mn, 0.284% to 0.347% of P, 0.026% to 0.032% of S, 1.152% to 1.408% of Cu, and the balance of Fe, and then 75 ferrosilicon inoculant is weighed according to the total mass of the raw materials;

[0011] The rare earth elements are La or Ce;

[0012] III. Melting:

[0013] The weighed raw materials are placed in a medium-frequency induction furnace and heated and melted to obtain molten iron;

[0014] IV. Inoculation:

[0015] The stream inoculation method is adopted, and the 75 ferrosilicon inoculant is added to the molten iron and stirred to obtain inoculated molten iron;

[0016] V. Pouring:

[0017] The inoculated molten iron is poured into a mold, and finally cooled to room temperature to obtain a rare earth element doped and multi-component micro-alloyed cylinder sleeve cast iron based on Tarkall-C alloy.

[0018] The beneficial effects of the present application are:

[0019] After the gray cast iron is doped with rare earth elements, the material's friction and wear performance can be significantly improved in the following ways: first, the rare earth elements can form fine rare earth compound particles in the material, which act as a strengthening phase and can effectively improve the hardness and wear resistance of the material; second, the rare earth elements can change the microstructure of the material, refining the grains and thus improving the strength and toughness of the material; in addition, the rare earth elements can also form a dense oxide film on the surface of the material, which plays a good lubricating and anti-wear role, thereby reducing the friction coefficient and prolonging the service life of the material.

[0020] The present application realizes fine crystal, low white mouth, high flow in the casting link by Ni+Cr+Mo+V+Nb multi-element synergistic micro-alloying, and the subsequent structure is "tough pearlite + dispersed MC / M2C3 hard phase". The elements are complementary: Ni and Cu synergistically promote graphitization and improve thermal conductivity; Cr and Mo solid solution strengthening and stabilizing carbide, V and Nb refining grains and pinning dislocations. Therefore, the above rare earth-multiple synergistic system significantly improves the comprehensive service performance of the cylinder liner through the three mechanisms of microstructure refinement, strengthening and lubrication.

[0021] Therefore, the addition of rare earth elements and Ni+Cr+Mo+V+Nb multi-component micro-alloying elements to gray cast iron cylinder liners can refine graphite, enhance the hardness of pearlite matrix and phosphorus eutectic structure, significantly improve the mechanical properties and friction and wear properties of gray cast iron cylinder liners; refined graphite is more likely to fall off to form self-lubricating effect, thereby improving wear resistance, reducing friction coefficient and wear amount, while effectively inhibiting micro-crack propagation, significantly improving anti-seizure and wear life. The preparation method of the present application is simple and easy to operate, and is suitable for industrial production.

[0022] The present application develops a new type of rare earth doped and Ni+Cr+Mo+V+Nb multi-component micro-alloyed gray cast iron alloy based on rare earth element doping, which is used for ship low-speed engine cylinder liners, can realize the cylinder liner outer diameter of φ450 mm~φ1200 mm, wall thickness of 35mm~120mm, length of 1500mm~3200mm, and is suitable for large internal combustion engines such as marine two-stroke diesel engines, so it has important research significance and application value. This new alloy not only can significantly improve the service life, friction and wear properties and anti-tightening performance of the material under high temperature, high pressure and low speed working conditions, but also can reduce the cost, and provide an efficient and energy-saving material solution for the shipbuilding industry. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The microstructure of Tarkall-C alloy and the Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb prepared in Example 1, a is Tarkall-C alloy, b is Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb;

[0024] Figure 2 The sample physical map of the Tarkall-C alloy and the Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb prepared in Example 1 after friction and wear test;

[0025] Figure 3 The friction coefficient change comparison chart of the Tarkall-C alloy and the Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb prepared in Example 1.

[0026] Figure 4 The cross-sectional wear amount of the Tarkall-C alloy and the Tarkall-C alloy with rare earth element La and Ni+Cr+Mo+V+Nb doping is compared. DETAILED DESCRIPTION

[0027] Specific embodiment one: a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy, which is composed of 0.026%~0.032% rare earth elements, 0.099%~0.121% Ni, 0.108%~0.132% Cr, 0.081%~0.099% Mo, 0.067%~0.082% V, 0.108%~0.132% Nb, 2.565%~3.135% C, 0.954%~1.166% Si, 0.747%~0.913% Mn, 0.284%~0.347% P, 0.026%~0.032% S, 1.152%~1.408% Cu and the balance of Fe by mass percentage;

[0028] The rare earth element is La or Ce.

[0029] In the casting process of steel and iron, rare earth elements can well improve the performance of cast iron, and rare earth elements have the effect of refining molten iron and eliminating the harmful effects of impurity elements. The gray cast iron material doped with rare earth elements can significantly improve the wear resistance and service life of the engine. Alloying elements realize the leap of cast iron in strength, heat resistance, wear resistance, corrosion resistance, fatigue and other comprehensive performance through multiple mechanisms such as solid solution strengthening, carbide / nitride dispersion strengthening, graphite morphology and matrix structure control, and oxidation film formation, which are especially suitable for high-end parts such as large low-speed diesel engine cylinder liners, brake discs and rolls.

[0030] The beneficial effects of the present embodiment are:

[0031] After the gray cast iron is doped with rare earth elements, the friction and wear performance of the material can be significantly improved in the following ways: first, rare earth elements can form fine rare earth compound particles in the material, which can effectively improve the hardness and wear resistance of the material as a strengthening phase; second, rare earth elements can change the microstructure of the material and refine the grains, thereby improving the strength and toughness of the material; in addition, rare earth elements can also form a dense oxide film on the surface of the material, which plays a good lubricating and anti-wear role, thereby reducing the friction coefficient and prolonging the service life of the material.

[0032] The embodiment realizes fine crystal, low white mouth, high flow at the casting link, and the subsequent structure is "tough pearlite + dispersed MC / M2C3 hard phase" through Ni+Cr+Mo+V+Nb multi-element synergistic micro-alloying. The elements are complementary: Ni and Cu synergistically promote graphitization and improve thermal conductivity; Cr and Mo solid solution strengthening and stabilizing carbide, V and Nb refining grains and pinning dislocations. Therefore, the above rare earth-multiple synergistic system significantly improves the comprehensive service performance of the cylinder liner through the three mechanisms of microstructure refinement, strengthening and lubrication.

[0033] Therefore, the addition of rare earth elements and Ni+Cr+Mo+V+Nb multi-component micro-alloying elements to gray cast iron cylinder liners can refine graphite, enhance the hardness of pearlite matrix and phosphorus eutectic structure, and significantly improve the mechanical properties and friction and wear properties of gray cast iron cylinder liners; refining graphite is more likely to fall off to form self-lubricating effect, thereby improving wear resistance, reducing friction coefficient and wear amount, while effectively inhibiting micro-crack propagation, significantly improving anti-seizure and wear life. The preparation method of the embodiment is simple and easy to operate, and is suitable for industrial production.

[0034] The embodiment develops a new type of rare earth doped and Ni+Cr+Mo+V+Nb multi-component micro-alloyed gray cast iron alloy based on rare earth element doping, which is used for cylinder liners of marine low-speed engines, and can realize an outer diameter of the cylinder liner of φ450 mm~φ1200 mm, a wall thickness of 35 mm~120 mm, and a length of 1500 mm~3200 mm, and is suitable for large internal combustion engines such as marine two-stroke diesel engines, so it has important research significance and application value. This new alloy not only can significantly improve the service life, friction and wear properties, and anti-tightening performance of the material under high temperature, high pressure, and low speed working conditions, but also can reduce the cost, and provides an efficient and energy-saving material solution for the marine industry.

[0035] Specific embodiment two: the embodiment is a preparation method of a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy, which is carried out according to the following steps:

[0036] I. Molding:

[0037] The molding of the mold cavity is completed through sand mixing, compaction, and mold removal, and then the mold is closed and locked at the box setting station and the pouring riser is set;

[0038] II. Weighing:

[0039] The raw materials are weighed according to 0.026%-0.032% of rare earth elements, 0.099%-0.121% of Ni, 0.108%-0.132% of Cr, 0.081%-0.099% of Mo, 0.067%-0.082% of V, 0.108%-0.132% of Nb, 2.565%-3.135% of C, 0.954%-1.166% of Si, 0.747%-0.913% of Mn, 0.284%-0.347% of P, 0.026%-0.032% of S, 1.152%-1.408% of Cu and the balance of Fe, and then 75 ferrosilicon inoculant is weighed according to the total mass of the raw materials;

[0040] The rare earth elements are La or Ce;

[0041] III. Melting:

[0042] The weighed raw materials are placed in a medium-frequency induction furnace to be heated and melted to obtain molten iron;

[0043] IV. Inoculation:

[0044] The 75 ferrosilicon inoculant is added into the molten iron to obtain inoculated molten iron by using the stream inoculation method;

[0045] V. Pouring:

[0046] The inoculated molten iron is poured into a mold to be cooled to room temperature to obtain a Tarkall-C alloy-based cylinder sleeve cast iron doped with rare earth elements and multi-component micro-alloying.

[0047] Specific embodiment three: different from the specific embodiment two, in the step one, the water glass sand high-pressure molding is used in the molding process of the mold cavity, and the cold iron is pre-embedded, and the compaction rate of the molding sand is 35%-45%. The others are the same as those in the specific embodiment two.

[0048] Specific embodiment four: different from the specific embodiment two or three, in the step two, the raw materials are Q10 pig iron, phosphorus iron block, ferrosilicon block, manganese iron block, 45 steel, copper, chromium iron alloy, niobium iron alloy, nickel plate, vanadium iron alloy, molybdenum iron alloy and rare earth element block. The others are the same as those in the specific embodiment two or three.

[0049] Specific embodiment five: different from the specific embodiment two to four, the rare earth element block is lanthanum iron block or cerium iron block. The others are the same as those in the specific embodiment two to four.

[0050] Specific embodiment six: different from the specific embodiment two to five, in the step two, the mass ratio of the total mass of the raw materials to the mass of the 75 ferrosilicon inoculant is 1:(0.05%-0.10%). The others are the same as those in the specific embodiment two to five.

[0051] Seventh Embodiment: Different from one of the second to sixth embodiments, the particle size of the 75 ferrosilicon inoculant in step two is 1mm-2.5mm. The others are the same as the second to sixth embodiments.

[0052] Eighth Embodiment: Different from one of the second to seventh embodiments, the weighed raw materials are placed in a medium-frequency induction furnace in step three, and then heated to 1500℃-1560℃ and melted. The others are the same as the second to seventh embodiments.

[0053] Ninth Embodiment: Different from one of the second to eighth embodiments, the inoculated molten iron is poured into a mold at a pouring temperature of 1345℃-1400℃ in step five. The others are the same as the second to eighth embodiments.

[0054] Tenth Embodiment: Different from one of the second to ninth embodiments, the cooling in step five is a sand mold cooling method. The others are the same as the second to ninth embodiments.

[0055] The beneficial effects of the present application are verified by the following examples:

[0056] Example One:

[0057] A preparation method of a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy, which is carried out according to the following steps:

[0058] I. Molding:

[0059] The molding of the mold cavity is completed by sand mixing, compacting and demolding, and then the mold is closed and locked at the box setting station and the pouring riser is set;

[0060] II. Weighing:

[0061] The raw materials are weighed according to 0.029% of La, 0.11% of Ni, 0.12% of Cr, 0.09% of Mo, 0.075% of V, 0.12% of Nb, 2.85% of C, 1.06% of Si, 0.83% of Mn, 0.315% of P, 0.029% of S, 1.28% of Cu and the balance of Fe, and then 75 ferrosilicon inoculant is weighed according to the total mass of the raw materials;

[0062] The raw materials are Q10 pig iron, phosphorus iron block, ferrosilicon block, manganese iron block, 45 steel, copper, chromium iron alloy, niobium iron alloy, nickel plate, vanadium iron alloy, molybdenum iron alloy and lanthanum iron block;

[0063] The mass ratio of the total mass of the raw materials to the mass of the 75 ferrosilicon inoculant is 1:0.05%;

[0064] The particle size of the 75 ferrosilicon inoculant is 1 mm to 2.5 mm;

[0065] III. Melting:

[0066] The weighed raw materials are placed in a medium-frequency induction furnace, and then heated to 1500°C to 1560°C and melted to obtain molten iron;

[0067] IV. Inoculation:

[0068] The 75 ferrosilicon inoculant is added to the molten iron by the stream inoculation method to obtain inoculated molten iron;

[0069] V. Pouring:

[0070] The inoculated molten iron is poured into a mold at a pouring temperature of 1345°C to 1400°C, and then cooled to room temperature by the sand mold cooling method to obtain the Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb.

[0071] In the molding process of the step one, the sodium silicate sand high-pressure molding is used, cold iron is pre-embedded, and the compaction rate of the molding sand is 38%.

[0072] Table 1 Composition table of Tarkall-C alloy (wt. %)

[0073]

[0074] Table 2 Composition table of Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb (wt. %) of Example 1

[0075]

[0076] Figure 1 The microstructure of the Tarkall-C alloy and the Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb prepared in Example 1, a is the Tarkall-C alloy, and b is the Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb; as shown in the figure, after the Tarkall-C alloy is doped with rare earth La and Ni+Cr+Mo+V+Nb, the graphite organization becomes fine and long.

[0077] Friction and wear test: The friction and wear test was carried out on a ball-disc high temperature friction and wear tester (Lanzhou Zhongke Kaihua HT-1000). The grinding material was GCR15 ball. In order to simulate the real working conditions of cylinder sleeve-piston ring under high cylinder temperature, high load and low speed, point contact friction test was adopted. The load was set to 20 N, the frequency was 2 Hz, the time was 1 h, and the temperature was 100 DEG C. Under this parameter, the contact pressure of point contact ball-disc friction can be calculated according to Hertz contact theory, the contact position of friction pair interface, and the load can reach hundreds of MPa or even higher. According to the flash temperature theory, the flash temperature in the friction process can be calculated, and the contact position of friction pair interface, and the instantaneous high temperature of contact temperature can reach thousands of DEG C or even higher. Therefore, the rotation speed is set to 2 Hz, which can simulate the real working condition of low speed engine cylinder sleeve under high cylinder temperature, high load and low speed.

[0078] Figure 2 The sample physical map of Tarkall-C alloy and the Tarkall-C alloy cylinder sleeve doped with rare earth La and Ni+Cr+Mo+V+Nb prepared in example one after friction and wear test; from the figure, it can be seen that after the Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb multi-component micro-alloying modification, the width and depth of the wear scar are significantly reduced, and the wear resistance is obviously improved.

[0079] Figure 3 The friction coefficient change comparison chart of Tarkall-C alloy and Tarkall-C alloy cylinder sleeve doped with rare earth La and Ni+Cr+Mo+V+Nb prepared in example one; from the figure, it can be seen that after the Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb multi-component micro-alloying modification, the friction coefficient is significantly reduced, and the friction reduction performance is improved. Through experiment and data calculation, the average friction coefficient of Tarkall-C alloy is 0.672, and the average friction coefficient of the cylinder sleeve after Tarkall-C alloy doped with rare earth La and Ni+Cr+Mo+V+Nb multi-component micro-alloying modification is 0.084.

[0080] Figure 4The cross-section wear amount of Tarkall-C alloy and Tarkall-C alloy with rare earth La and Ni+Cr+Mo+V+Nb doping is compared. As shown in the figure, after the modification of Tarkall-C alloy with rare earth La and Ni+Cr+Mo+V+Nb multi-component micro-alloying, the wear depth and width of Tarkall-C alloy are significantly reduced, and the friction and wear performance is improved. Through experiments and data calculation, the wear width of Tarkall-C alloy is 1383.333 μm, and the wear width of Tarkall-C alloy with rare earth La and Ni+Cr+Mo+V+Nb multi-component micro-alloying is 183.333 μm; the wear depth of Tarkall-C alloy is 63.158 μm, and the wear width of Tarkall-C alloy with rare earth La and Ni+Cr+Mo+V+Nb multi-component micro-alloying is 1.579 μm.

Claims

1. A rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy, characterized in that It is composed of 0.026%~0.032% rare earth elements, 0.099%~0.121% Ni, 0.108%~0.132% Cr, 0.081%~0.099% Mo, 0.067%~0.082% V, 0.108%~0.132% Nb, 2.565%~3.135% C, 0.954%~1.166% Si, 0.747%~0.913% Mn, 0.284%~0.347% P, 0.026%~0.032% S, 1.152%~1.408% Cu and the balance of Fe by mass percentage; The rare earth element is La or Ce.

2. A method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 1, characterized in that It is carried out in the following steps: I. Molding: The molding of the cavity is completed by sand mixing, compaction and mold stripping, and then the mold is closed and locked at the mold box station and the pouring and feeding head is set; II. Weighing: The raw materials are weighed according to the mass percentage of 0.026%~0.032% rare earth elements, 0.099%~0.121% Ni, 0.108%~0.132% Cr, 0.081%~0.099% Mo, 0.067%~0.082% V, 0.108%~0.132% Nb, 2.565%~3.135% C, 0.954%~1.166% Si, 0.747%~0.913% Mn, 0.284%~0.347% P, 0.026%~0.032% S, 1.152%~1.408% Cu and the balance of Fe, and then 75 ferrosilicon inoculant is weighed according to the total mass of the raw materials; The rare earth element is La or Ce. III. Melting: The weighed raw materials are placed in a medium-frequency induction furnace and heated and melted to obtain molten iron; IV. Inoculation: The 75 ferrosilicon inoculant is added to the molten iron by stream inoculation method to obtain inoculated molten iron; V. Pouring: The inoculated molten iron is poured into the mold, and finally cooled to room temperature to obtain a rare earth element doped and multi-component micro-alloyed cylinder sleeve cast iron based on Tarkall-C alloy.

3. A method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 2, characterized in that In step I, water glass sand high-pressure molding is used in the molding process of the cavity, and cold iron is pre-embedded, and the sand compaction rate is 35%~45%.

4. The method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 2, characterized in that In step II, the raw materials are Q10 pig iron, phosphorus iron block, ferrosilicon block, manganese iron block, 45 steel, copper, chromium iron alloy, niobium iron alloy, nickel plate, vanadium iron alloy, molybdenum iron alloy and rare earth element block.

5. A method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 4, characterized in that The rare earth element block is lanthanum iron block or cerium iron block.

6. A method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 2, characterized in that In step II, the mass ratio of the total mass of the raw materials to the mass of the 75 ferrosilicon inoculant is 1:(0.05%~0.10%).

7. A method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 2, characterized in that In step II, the particle size of the 75 ferrosilicon inoculant is 1mm~2.5mm.

8. A method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 2, characterized in that In step III, the weighed raw materials are placed in a medium-frequency induction furnace, and then heated to 1500℃~1560℃ and melted.

9. A method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 2, characterized in that In step V, the inoculated molten iron is poured into the mold at a pouring temperature of 1345℃~1400℃.

10. A method of producing a rare earth element doped and multi-component micro-alloyed cylinder liner cast iron based on Tarkall-C alloy according to claim 2, characterized in that In step V, the cooling is a sand mold cooling method.

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