Nb-microalloyed high manganese steel lining plate for mine grate ball mill and preparation method
A high-manganese steel liner and micro-alloying technology, which is applied in the field of metal materials, can solve the problems of high cost and achieve the effects of improving hardenability, uniform distribution of alloying elements, and good toughness
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Embodiment 1
[0040] The chemical composition of niobium microalloyed high manganese steel liners for grid type ball mills by weight percentage: C 1.20%, Si0.70%, Mn 14.20%, Cr 1.99%, Nb 0.034%, P, S≤0.006%, balance It is Fe and unavoidable impurities.
[0041] A niobium microalloyed high manganese steel liner plate for a grid type ball mill and a preparation method thereof, comprising the following steps:
[0042] (1) Ingredients: select high-quality crushed steel sheets, ferrosilicon, recarburizer, pure manganese, high-carbon chromium, and ferroniobium according to the weight percentage of the alloy composition;
[0043](2) Melting: adopt medium-frequency induction furnace, start the process through cold furnace, that is, heat the charge for 1 hour after it is red hot, and then melt it with high power; add crushed steel material at the bottom of the furnace, add carbon agent and pure iron, so as to achieve close stacking; After the furnace material is melted, slag is removed; when the te...
Embodiment 2
[0048] Design composition and batching, smelting and casting molding steps are the same as embodiment 1.
[0049] The heat treatment process is as follows: the temperature is raised to 1100°C at 8°C / min, then kept for 1.0h, and then water-cooled to room temperature.
[0050] The performance test of the obtained liner shows that the tensile strength is 953.2MPa, the yield strength is 427.1MPa, the hardness is 222HBW, and the impact toughness of the standard U-shaped notch is 156.1J / cm 2 .
[0051] Compared with Example 1, from image 3 It can be seen that the austenite grains are relatively fine, indicating that under the heat treatment system in Example 1, the holding time is longer, and the grains grow a little, so the yield strength of the test steel in Example 1 is somewhat reduced. However, due to the more uniform distribution of alloying elements, its toughness has been greatly improved.
Embodiment 3
[0053] The chemical composition of niobium microalloyed high manganese steel liners for grid type ball mills by weight percentage: C 1.17%, Si0.72%, Mn 14.20%, Cr 2.00%, Nb 0.074%, P, S≤0.006%, balance It is Fe and unavoidable impurities.
[0054] A niobium microalloyed high manganese steel liner plate for a grid type ball mill and a preparation method thereof, comprising the following steps:
[0055] (1) Ingredients: select high-quality crushed steel sheets, ferrosilicon, recarburizer, pure manganese, high-carbon chromium, and ferroniobium according to the weight percentage of the alloy composition;
[0056] (2) Melting: adopt medium-frequency induction furnace, start the process through cold furnace, that is, heat the charge for 1 hour after it is red hot, and then melt it with high power; add crushed steel material at the bottom of the furnace, add carbon agent and pure iron, so as to achieve close stacking; After the furnace material is melted, slag is removed; when the t...
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