AISI4340 prestress steel bar manufacturing method
A technology of prestressed steel bar and manufacturing method, which is applied in the manufacturing field of AISI4340 prestressed steel bar, can solve the problems of delayed lag cracks, easy cracks, inability to spread evenly, etc. The effect of mechanical strength
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Embodiment 1
[0029] A kind of manufacturing method of AISI4340 prestressed steel bar provided by the present embodiment comprises the following steps:
[0030] Step (1): Taking AISI4340MOD steel as the blank, the component content of AISI4340MOD steel includes the following components by mass percentage, carbon: 0.3%, silicon: 0.18%, manganese: 0.50%, chromium: 0.90%, molybdenum: 0.20% , phosphorus: 0%, sulfur: 0%, hydrogen: 1.0ppm, nickel: 0%, vanadium: 0%, copper: 0-0.30%, 0-0.9% residual elements, the rest is Fe;
[0031] The blank is smelted and finished rolled to the prestressed steel rod forging billet of the required size, and the smelting temperature is 800°C;
[0032] Step (2): Heat the prestressed steel rod forging billet obtained in step (1) to 890°C for 360 minutes, air cool to 310°C for 180 minutes, then heat to 615°C for 650 minutes, and cool in the furnace to 380°C out of the oven and air-cooled;
[0033] Step (3): Roughly process the prestressed steel rod forging billet a...
Embodiment 2
[0037] A kind of manufacturing method of AISI4340 prestressed steel bar provided by the present embodiment comprises the following steps:
[0038] Step (1): Taking AISI4340MOD steel as the blank, the component content of AISI4340MOD steel includes the following components by mass percentage, carbon: 0.32%, silicon: 0.36%, manganese: 0.70%, chromium: 1.10%, molybdenum: 0.30% , phosphorus: 0.02%, sulfur: 0.025%, hydrogen: 1.8ppm, nickel: 0.40%, vanadium: 0.03%, copper: 0.30%, 0-0.9% residual elements, the rest is Fe;
[0039] The billet is smelted and finished rolled to the prestressed steel rod forging billet of the required size, and the smelting temperature is 850°C;
[0040]Step (2): Heat the prestressed steel rod forging billet obtained in step (1) to 870°C for 360 minutes, air-cool to 290°C for 180 minutes, then heat to 585°C for 650 minutes, and cool in the furnace to 340°C out of the oven and air-cooled;
[0041] Step (3): Roughly process the prestressed steel rod forg...
Embodiment 3
[0045] A kind of manufacturing method of AISI4340 prestressed steel bar provided by the present embodiment comprises the following steps:
[0046] Step (1): Taking AISI4340MOD steel as the blank, the component content of AISI4340MOD steel includes the following mass percentages: carbon: 0.31%, silicon: 0.28%, manganese: 0.6%, chromium: 1%, molybdenum: 0.25% , phosphorus: 0.01%, sulfur: 0.02%, hydrogen: 1.6ppm, nickel: 0.30%, vanadium: 0.02%, copper: 0.20%, 0.8% residual elements, the rest is Fe;
[0047] The blank is smelted and finished rolled to the prestressed steel rod forging billet of the required size, and the smelting temperature is 825°C;
[0048] Step (2): Put the prestressed steel rod forging billet obtained in step (1) into the furnace, heat it to 880°C and hold it for 360 minutes, air cool it to 300°C and hold it for 180 minutes, then heat it to 600°C and hold it for 650 minutes, and cool it in the furnace to 360°C out of the oven and air-cooled;
[0049] Step (...
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