Trip-type two-phase martensitic steel and ultrahigh-strength-steel processed article obtained therefrom
An ultra-high-strength, martensitic technology that can be used in manufacturing tools, furnace types, furnaces, etc., to solve problems such as insufficient high-strength materials
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Embodiment 1
[0083] A sample slab of steel type A composed of the composition shown in Table 1 was manufactured by continuous casting (the unit in the table is mass %, the rest is Fe and unavoidable impurities), and the slab is reheated to the 1250°C zone After hot rolling, pickling, and machining, a forging test piece composed of a square bar with a thickness of 20 mm, a length of 80 mm and a width of 32 mm was manufactured from a steel bar with a diameter of 32 mm and a length of 80 mm. The test piece was made at 950°C Heating for more than 1 second, forging, and then cooling to 430°C at an average cooling rate of 20°C / s, and then cooling to the isothermal transformation temperature shown in Table 2 at an average cooling rate of 20°C / s, At this temperature, an isothermal phase change treatment (IT treatment) is performed and cooled to room temperature. Thereafter, under the conditions shown in Table 2, carbon enrichment treatment (P treatment: holding at 200 to 400° C. for 1000 seconds) w...
Embodiment 2
[0107] In this Example 2, various characteristics of the case where the isothermal transformation temperature (IT treatment temperature) was changed were studied, and a sample slab of steel type B composed of the composition shown in Table 1 was produced by continuous casting (in the table) The unit is mass%, the remainder is Fe and unavoidable impurities). After reheating the slab to a zone of 1250°C, it is hot rolled, pickled and then mechanically processed. From bar steel with a diameter of 32mm and a length of 80mm A forging test piece composed of a square bar with a thickness of 20 mm, a length of 80 mm and a width of 32 mm was produced. The test piece was heated at 950°C for 1 second or longer, forged, and then cooled to an average cooling rate of 20°C / s. 430°C, and then cool to the isothermal phase change treatment temperature shown in Table 3 at an average cooling rate of 20°C / s, perform isothermal phase change treatment (IT treatment) at this temperature, and cool to ro...
Embodiment 3
[0112] In this Example 3, similar to the above-mentioned Example 2, various characteristics of the case where the isothermal transformation temperature (IT processing temperature) is changed were studied, and the steel composed of the composition shown in Table 1 was produced by continuous casting. A sample slab (the unit in the table is mass%, the rest is Fe and unavoidable impurities). After reheating the slab to the 1250°C zone, it is hot rolled, pickled and then mechanically processed. A steel bar with a diameter of 32 mm and a length of 80 mm was used to produce a forging test piece composed of a square bar with a thickness of 20 mm, a length of 80 mm, and a width of 32 mm. The test piece was heated at 950°C for 1 second or longer, and then forged was performed at 20°C. Cooled to 430°C at an average cooling rate of 20°C / s, then cooled to the isothermal phase change treatment temperature shown in Table 4 at an average cooling rate of 20°C / s, performed isothermal phase change...
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Abstract
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