Continuous casting method of heat-resistance stainless steel for steam turbine blade
A technology for heat-resistant stainless steel and steam turbine blades, which is applied in the field of heat-resistant stainless steel continuous casting for steam turbine blades, can solve the problems of low comprehensive yield, difficulty in continuous casting, longitudinal cracks in continuous casting billets, etc., and achieve the effect of reducing production costs.
Active Publication Date: 2012-05-23
SHANXI TAIGANG STAINLESS STEEL CO LTD
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AI Technical Summary
Problems solved by technology
Since the carbon content in 1Cr11MoV steel is in the most sensitive area for longitudinal cracking of the slab, continuous casting is very difficult. The continuous casting slab produced by the existing continuous casting method has longitudinal crack defects, and the longitudinal crack is generally in the center of the slab width, with a depth of 10 to 15mm. , 2-8mm long (sometimes there are longitudinal cracks in the whole furnace billet)
Therefore, 1Cr11MoV is produced by injection molding, and the overall yield is low.
Method used
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Experimental program
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Effect test
Embodiment Construction
[0040] The specific implementation of the continuous casting method of heat-resistant stainless steel for 1Cr11MoV steam turbine blades is described in detail below in conjunction with the examples, but the specific implementation of the continuous casting method of heat-resistant stainless steel for 1Cr11MoV steam turbine blades is not limited to the following examples.
[0041] The dimensions of the slab are 2500mm long, 1015mm wide and 160mm thick.
[0042] (1) Ladle pouring
[0043] The weight of ladle molten steel is 45 tons, the temperature is 15650°C, and the mass percentage ratio of chemical composition of molten steel is:
[0044] C: 0.14% Si: 0.34% Mn: 0.42% P: 0.032% S: 0.005%
[0045] Cr: 10.55% Ni: 0.18% V: 0.34% Mo: 0.62, and the rest are Fe and unavoidable impurities.
[0046] After the ladle containing molten steel is sedated on the continuous casting fork arm for 8 minutes, the ladle is introduced into the tundish through the long nozzle, and the connection ...
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The invention relates to a continuous casting method of heat-resistance stainless steel for a steam turbine blade. The continuous casting method comprises the following steps of: (1) ladle pouring: keeping the temperature of molten steel at 1,560-1,570 DEG C, and after the molten steel stands for 8-10min on a continuous casting fork arm, leading the ladle into a tundish, wherein a connecting part of a long nozzle and a ladle is sealed by adopting argon; (2) tundish pouring: keeping the temperature of the molten steel in the tundish at 1,520-1,540 DEG C, and when the molten steel in the tundish reaches 12 tons, leading the molten steel in the tundish into a crystallizer; (3) blank pulling: beginning blanking pulling after the tundish pouring lasts for 80-10 seconds, and after reaching atarget pulling speed, carrying out blank pulling with a constant pulling speed; slowly reducing the pulling speed within last 8-10 minutes of the continuous casting; when left molten steel in the tundish is 2-4 tons, carrying out a capping operation by continuous casting; (4) cutting: keeping the temperature of casting blanks not lower than 700 DEG C; (5) casting blank annealing: sending the casting blanks into an annealing furnace when the casting blanks are heated for annealing at an annealing temperature of 760+ / -30 DEG C and then preserving heating for 4-6 hours; and taking the casting blanks out of the furnace for cooling in heap. The continuous casting blanks cast by the invention have no longitudinal cracks.
Description
technical field [0001] The invention relates to a continuous casting method of heat-resistant stainless steel for steam turbine blades, in particular to a continuous casting method for heat-resistant stainless steel for 1Cr11MoV steam turbine blades. Background technique [0002] 1Cr11MoV (GB / TB8732-2004) is a martensitic stainless heat-strength steel, which is a good material for manufacturing steam turbine and gas turbine blades used below 540 °C. Since the carbon content in 1Cr11MoV steel is in the most sensitive area for longitudinal cracking of the slab, continuous casting is very difficult. The continuous casting slab produced by the existing continuous casting method has longitudinal crack defects, and the longitudinal crack is generally in the center of the slab width, with a depth of 10-15mm. , 2 to 8mm long (sometimes there are longitudinal cracks in the whole furnace slab). Therefore, 1Cr11MoV is produced by injection molding, and the overall yield is low. Cont...
Claims
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IPC IPC(8): B22D11/00C22C38/46C22C38/24
Inventor 范新智刘承志李俊
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD