High-manganese non-magnetic steel containing niobium and preparation method thereof
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A technology of non-magnetic steel and high manganese is applied in the field of non-magnetic steel production to achieve the effects of energy saving, grain refinement and simple preparation method
Inactive Publication Date: 2012-10-24
UNIV OF SCI & TECH BEIJING
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[0005] As we all know, austenitic manganese steel has poor forging process performance and difficult machining, which limits the use of high manganese steel to a certain extent
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[0030] Composition: C: 0.95%, Mn: 14.9%, Si: 0.38%; Nb: 0.012%; P≤0.007%; S≤0.0047; the rest is iron or unavoidable impurities.
[0031] Smelting: Vacuum smelting in an electromagnetic induction furnace, protected by argon gas, to obtain ingots that meet the composition requirements.
[0032] Forging: The forging temperature is slowly heated during the forging process, heating temperature: 1150-1200°C, holding time: 30min, starting forging temperature: 1200°C, final forging temperature: ≥900°C.
[0033] Rolling process: hot rolling heating temperature 1200°C, heat preservation for 1 hour, hot rolling on a 350 two-roll hot rolling mill to obtain a hot-rolled sheet with a thickness of about 6-7mm, and a total deformation of 80-90%. The rolling and final rolling temperatures are 1050°C and 900°C respectively, followed by water toughening treatment.
[0034] Water toughening treatment process: heat a 7mm thick hot-rolled steel plate to 1000°C, keep it warm for 15 minutes, and the...
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Abstract
A high-manganese non-magnetic steel containing niobium and a preparation method thereof belong to the technical field of non-magnetic steel production. Components of the high-manganese non-magnetic steel containing niobium comprises, by mass percent, 10 to 15 % of Mn, 0.8 to 1.2 % of C, 0.3 to 0.5 % of Si, less than 0.008 % of P, less than 0.005 % of S, 0.01 to 0.02 % of Nb, and the balance being Fe. The preparation method comprises steps of smelting, forging, hot rolling, water toughening, and water quenching after the hot-rolled plate is kept in a heating furnace for 15 minutes at 1000 DEG C. The method is advantageous in that the high manganese steel is pre-deformed by using a rolling method, thereby being capable of refining grain size and improving organization and performance, and a finished product has tensile strength of 900 to 1100 MPa, elongation percentage of 50 to 60%, Rockwell hardness of 15 to 22 HRC and magnetic permeability of less than 1.0002. According to the invention, the non-magnetic steel is superior in magnetic, mechanical and processing properties, and the method is simple in production, low in economic cost, and is applicable in the fields of mechanical production and transportation, such as nonmagnetic structural members and nonmagnetic molds used for magnetic shielding in large and medium-sized transformer oil tanks, train tracks, etc.
Description
Technical field [0001] The present invention belongs to the field of magnetic steel production technology, especially for a structural parts for making non -magnetic, high toughness, and high -intensity., Magnetic Selection Equipment Simplified, Iron Division, Special Swatering Electric Furnace Line and other structural parts. Background technique: [0002] Magnetic steel materials include the austenitic stainless steel and the Austenite High manganese without magnetic steel.The structural parts are not magnetic steel, and the Fe-C-Mn system is basically used to obtain a uniform Austeen tissue through water tough treatment. [0003] The use of magnetic steel is very wide. It is used in automatic control systems, precision instruments, telecommunications and motors, and many military fields. Especially the large nuclear fusion device and magnetic suspension super -speed linear motor train are used.Structural materials, magnetic steel is indispensable.The magnetic guidance rate of...
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