High-strength toughness carburized and air-cooled steel for tunneling tool and production method thereof
A high-strength and toughness, air-cooled technology, applied in the field of materials, can solve problems such as reducing strength and toughness, and achieve the effects of improving hardenability, strength and toughness, and increasing tempering temperature.
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Embodiment 1
[0013] A method for producing steel for high-strength and toughness carburized air-cooled excavation tools, comprising the following steps:
[0014] C: 0.28%, Si: 1.05%, Mn: 2.2%, Mo: 0.28%, V: 0.10%, Cr: 1.8%, rare earth elements Ce, La: 0.012%, and the balance is iron.
[0015] (1) The above proportioned materials are smelted into ingots, forged and rolled at 1100°C, then heated at 900°C and then air-cooled: bainite structure is obtained at a cooling rate of 50°C / min, and have excellent strength after tempering at 250°C. toughness;
[0016] (2) The steel is conventionally air-cooled at a cooling rate of 100°C / min after carburizing at 900°C. After testing: the surface hardness is HRC62.4, there is no internal oxidation defect, the core part is HRC54.1, and the absolute value of the surface compressive stress (negative value) reaches more than 400MPa.
Embodiment 2
[0018] A method for producing steel for high-strength and toughness carburized air-cooled excavation tools, comprising the following steps:
[0019] C: 0.1%, Si: 0.7%, Mn: 1.7%, Mo: 0.3%, V: 0.2%, Cr: 0.70%, rare earth elements Ce, La: 0.02%, and the balance is iron.
[0020] (1) The materials with the above proportions are smelted into ingots, forged and rolled at 1100°C, then heated at 900°C and then air-cooled: 100°C / min cooling rate to obtain bainite + martensite structure, tempered at 100°C. Has excellent strength and toughness;
[0021] (2) The steel is conventionally air-cooled at a cooling rate of 200°C / min after carburizing at 920°C. After testing: the surface hardness is HRC63, there is no internal oxidation defect, the core part is HRC55, and the absolute value of the surface compressive stress (negative value) reaches more than 400MPa.
Embodiment 3
[0023] A method for producing steel for high-strength and toughness carburized air-cooled excavation tools, comprising the following steps:
[0024] C: 0.40%, Si: 1.3%, Mn: 2.4%, Mo: 0.3%, V: 0.04%, Cr: 2.0%, rare earth elements Ce, La: 0.001%, and the balance is iron.
[0025] (1) The materials with the above ratio are smelted into ingots, forged and rolled at 1100°C, then heated at 900°C and then air-cooled: bainite + martensite structure is obtained at a cooling rate of 200°C / min, and tempered at 300°C. Has excellent strength and toughness;
[0026] (2) The steel is conventionally air-cooled at a cooling rate of 10°C / min after carburizing at 900°C. After testing: the surface hardness is HRC57, without internal oxidation defects, the core is HRC38, and the absolute value of the surface compressive stress (negative value) reaches more than 400MPa.
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