Firm high-temperature alloy easy welding and preparation method thereof

Abstract

The invention relates to the technical field of alloy materials, in particular to firm high-temperature alloy easy welding and a preparation method thereof. The technical scheme adopted by the invention is as follows: C: less than or equal to 0.06%; 0.35% to 0.60% of Si; mn: less than or equal to 0.80%; cr: 15.0 to 18.0%; al: 0.40% or less; s: less than or equal to 0.008%; less than or equal to 0.020% of P; less than or equal to 1.0% of Fe; 0.050% to 0.080% of La; 0.10% to 2.50% of Ce; less than or equal to 0.020% of N; o is less than or equal to 0.003%, Zr is 0.05-0.11%, and the balance is Co and inevitable impurities. The high-temperature alloy material has the advantages that different substances are added, so that the produced high-temperature alloy material has better performance, the content of impurities and the number of air holes can be effectively reduced when a strip is processed, and the toughness of the product is better.

Description

Technical Field

[0001] The invention relates to the technical field of alloy materials, and in particular to a strong high-temperature alloy that is easy to weld and a preparation method thereof. Background Art

[0002] The alloy can be formed and processed by traditional metal processing technology and is suitable for a variety of welding processes. However, in some structures with relatively large welding spaces, the welding efficiency is relatively low. If it is produced into a relatively large-sized welding wire, there are easily impurities and pores in the production process, which will not only affect the quality of welding, but also fail to meet the welding structure with relatively high requirements for welding firmness. The existing welding wire made of GH5188 alloy material has grain boundary defects, which will lead to a decrease in the fracture toughness of the alloy, making it more prone to cracking and fracture. When used for welding, the strength of the welding position is relatively poor. Summary of the invention

[0003] The purpose of the present invention is to provide a strong high-temperature alloy that is easy to weld and a preparation method thereof. By optimizing the composition of existing materials and adding different substances, the produced high-temperature alloy material can have better performance, and the content of impurities and the number of pores can be effectively avoided when processing strips, and the toughness of the product is better. When welding, the quality of the welding position can be higher, the fusion of the welding position can be tighter, the connection strength can be higher, cracking is not easy to occur during later use, and the safety during use is higher. It can meet the processing requirements of welding products with larger sizes. The strip processed by the preparation method has better overall density, higher welding fusion rate during later use, and higher material utilization rate during processing.

[0004] The technical solution of the present invention is as follows: A strong high temperature alloy is easy to weld, characterized by being composed of the following elements in percentage by weight: C: ≤0.06%; Si: 0.35-0.60%; Mn: ≤0.80%; Cr: 15.0~18.0%; AL: ≤0.40%; S: ≤0.008%; P: ≤0.020%; Fe: ≤1.0%; La: 0.050-0.080%; Ce: 0.10~2.50%; N: ≤0.020%; O: ≤0.003% Zr: 0.05-0.11%, the balance is Co and inevitable impurities.

[0005] Further, C: 0.06%; Si: 0.45%; Mn: 0.80%; Cr: 15.0%; AL: 0.20%; S: 0.007%; P: 0.020%; Fe: 1.0%; La: 0.050%; Ce: 0.15%; N: 0.020%; O: 0.003% Zr: 0.06%.

[0006] Further, C: 0.03%; Si: 0.38%; Mn: 0.20%; Cr: 18.0%; AL: 0.40%; S: 0.004%; P: 0.020%; Fe: 1.0%; La: 0.060%; Ce: 0.2%; N: 0.020%; O: 0.003% Zr: 0.07%.

[0007] Further, C: 0.02%; Si: 0.35%; Mn: 0.80%; Cr: 18.0%; AL: 0.10%; S: 0.006%; P: 0.010%; Fe: 1.0%; La: 0.050%; Ce: 0.10%; N: 0.010%; O: 0.003% Zr: 0.08%.

[0008] Further, C: 0.06%; Si: 0.55%; Mn: 0.80%; Cr: 16.5%; AL: 0.20%; S: 0.003%; P: 0.020%; Fe: 0.5%; La: 0.060%; Ce: 0.18%; N: 0.010%; O: 0.003% Zr: 0.09%.

[0009] A method for preparing a strong high-temperature alloy that is easy to weld comprises the following steps: 1) vacuum smelting, charging in a furnace, the charging order being: 1 / 3 of deoxidized carbon → Ni plate → Cr → Co → W, 1 / 3 of degassing carbon → small materials are separately added to a hopper C → Mn → Ti → Al, the vacuum degree during the melting period is less than 8 Pa, 0.05% of Ni-Mg is added during refining, 0.05% of rare earth is added, Al and Ti are added in the later stage of refining to be melted evenly, the vacuum degree during the refining period is ≤5 Pa, and at least two high-temperature instantaneous refinings and one low-temperature long-time refining are used to raise the steel temperature to 1520°C / 1-2min, reduce the steel temperature to 1420℃ (just formed film and punched film state), then adjust the refining temperature to 1520℃, refining time ≥45min, add deoxidized carbon, take samples for alloying to adjust the chemical composition, refining and stirring evenly, adjust the steel tapping temperature to 1540℃, pour 38kg electrode, fully compensate for shrinkage in the later stage, cool for 20 minutes, and mark the furnace number and quantity after demolding; 2) Electroslag, cut off the head and tail and end shrinkage holes at both ends of the electrode rod, locally grind the surface defects, and weld more than 100kg / piece; electroslag slag system: CaF2: AL2O3: CaO: MgO = 60: 20: 10: 10, power system: voltage 50-55V, current 3000-4000A, electroslag 100kg electroslag ingot * 3 pieces; 3) Forging, ingot heating 1160-1180℃, set temperature 1170℃, start forging temperature ≥1140℃, final forging temperature ≥950℃. Tempering forging is more than 120 minutes, and the forging operation is controlled to prevent corner cracks. The forging specification is S=40*215*800-1100mm. The defects are removed by flaw detection, and the surface is polished to be bright without peeling and cracks. The surface is 100% visually inspected and penetrated and qualified before being transferred to the next process; 4) Hot rolling, heating to 1160℃-1180℃, holding for ≥60 minutes, starting rolling temperature ≥1140℃, final rolling ≥980℃, rolling specification S=3*220*L loose coil, steel strip air cooling; 5) Cold rolling and heat treatment, strip heat treatment temperature: 1140℃~1160℃, holding for ≥45 minutes, water cooling, alkali pickling and clean surface without oxide scale, black spots, surface cracks, grinding and polishing, cold rolling production adopts multiple cold rolling annealing for production, deformation control is based on the hardening degree of the material, bright annealing temperature: 1120℃.

[0010] Beneficial effects of the present invention: The present invention optimizes the composition of existing materials and adds different substances to produce high-temperature alloy materials with better performance. The content of impurities and the number of pores can be effectively avoided during strip processing, and the toughness of the product is better. When welding, the quality of the welding position can be higher, the fusion of the welding position can be tighter, the connection strength can be higher, cracking is not easy to occur during later use, and the safety during use is higher. It can meet the processing requirements of welding products with larger sizes. The strip processed by the preparation method has better overall density, higher welding fusion rate during later use, higher material utilization rate during processing, and the cost during production and processing can also be reduced. DETAILED DESCRIPTION

[0011] The content by weight percentage is: C: ≤0.06%; Si: 0.35-0.60%; Mn: ≤0.80%; Cr: 15.0~18.0%; AL: ≤0.40%; S: ≤0.008%; P: ≤0.020%; Fe: ≤1.0%; La: 0.050-0.080%; Ce: 0.10~2.50%; N: ≤0.020%; O: ≤0.003% Zr: 0.05-0.11%, the balance is Co and unavoidable impurities, prepare materials. Processing is carried out according to the following steps: 1) Vacuum smelting, charging in the furnace, charging order: deoxidized carbon 1 / 3→Ni plate→Cr→Co→W, degassing carbon 1 / 3→small materials are added to the hopper separately C→Mn→Ti→AL, the vacuum degree during the melting period is less than 8Pa, refining adds Ni-Mg0.05%, rare earth 0.05%, Al and Ti are added in the later stage of refining to melt evenly, the vacuum degree during the refining period is ≤5Pa, and at least two high-temperature instantaneous refining and one low-temperature long-time refining are used to raise the steel temperature to 1520℃ / 1-2min , reduce the steel temperature to 1420℃ (just formed the film and punched the film state), then adjust the refining temperature to 1520℃, the refining time ≥45min, add deoxidized carbon, take samples for alloying to adjust the chemical composition, refining and stirring evenly, adjust the steel tapping temperature to 1540℃, pour 38kg electrode and fully compensate for shrinkage in the later stage, cool for 20 minutes and mark the furnace number after demolding; 2) Electroslag, cut off the head and tail and end shrinkage holes at both ends of the electrode rod, locally grind the surface defects, and weld more than 100kg / piece; electroslag slag system: CaF2: AL2O3: CaO: MgO = 60: 20: 10: 10, power system: voltage 50-55V, current 3000-4000A, electroslag 100kg electroslag ingot * 3 pieces; 3) Forging, ingot heating 1160-1180℃, set temperature 1170℃, start forging temperature ≥1140℃, final forging temperature ≥950℃. Tempering forging is more than 120 minutes, and the forging operation is controlled to prevent corner cracks. The forging specification is S=40*215*800-1100mm. The defects are removed by flaw detection, and the surface is polished to be bright without warping and cracks. The surface is 100% visually inspected and penetrated and qualified before being transferred to the next process; 4) Hot rolling, heating to 1160℃-1180℃, keeping warm for ≥60 minutes, rolling temperature ≥1140℃, final rolling ≥980℃, rolling specification S=3*220*L loose coil, The steel strip is air-cooled; 5) Cold rolling and heat treatment, the strip heat treatment temperature is: 1140℃~1160℃, insulation ≥45 minutes, water cooling, alkali pickling and pickling, the surface is free of oxide scale, black spots, surface cracks, grinding and polishing, cold rolling production adopts multiple cold rolling annealing for production, the deformation control is based on the hardening degree of the material, bright annealing temperature: 1120℃, finished product specifications: S=2.3*200mm, quantity 100kg; S=0.25*200mm, quantity 100kg.The present invention optimizes the composition of existing materials and adds different substances to produce high-temperature alloy materials with better performance. The content of impurities and the number of pores can be effectively avoided during strip processing, and the toughness of the product is better. When welding, the quality of the welding position can be higher, the fusion of the welding position can be tighter, the connection strength can be higher, cracking is not easy to occur during later use, and the safety during use is higher. It can meet the processing requirements of welding products with larger sizes. The strip processed by the preparation method has better overall density, higher welding fusion rate during later use, and higher material utilization rate during processing.

[0012] Preferably, C: 0.06%; Si: 0.45%; Mn: 0.80%; Cr: 15.0%; AL: 0.20%; S: 0.007%; P: 0.020%; Fe: 1.0%; La: 0.050%; Ce: 0.15%; N: 0.020%; O: 0.003% Zr: 0.06%, can make the surface welding fusion rate of the processed products higher when they are used later.

[0013] Preferably, C: 0.03%; Si: 0.38%; Mn: 0.20%; Cr: 18.0%; AL: 0.40%; S: 0.004%; P: 0.020%; Fe: 1.0%; La: 0.060%; Ce: 0.2%; N: 0.020%; O: 0.003% Zr: 0.07%. When used for welding, the overall corrosion and rust resistance of the welding position is better, the service life of the welding position is longer, the durability is more reliable, and the bearing capacity is stronger.

[0014] Preferably, C: 0.02%; Si: 0.35%; Mn: 0.80%; Cr: 18.0%; AL: 0.10%; S: 0.006%; P: 0.010%; Fe: 1.0%; La: 0.050%; Ce: 0.10%; N: 0.010%; O: 0.003% Zr: 0.08%.

[0015] Preferably, C: 0.06%; Si: 0.55%; Mn: 0.80%; Cr: 16.5%; AL: 0.20%; S: 0.003%; P: 0.020%; Fe: 0.5%; La: 0.060%; Ce: 0.18%; N: 0.010%; O: 0.003% Zr: 0.09%, which is more convenient in making mix proportions and the material cost in production is relatively lower.

[0016] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements or substitutions can be made without departing from the principles of the present invention. These improvements or substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A strong high temperature alloy easy to weld, characterized by: It is composed of the following elements, with the percentage by weight being: C：≤0.06%； Si: 0.35-0.60%; Mn: ≤0.80%; Cr ：15.0～18.0%； AL: ≤0.40%; S ：≤0.008%； P ：≤0.020%； Fe: ≤1.0%; La: 0.050-0.080%; Ce: 0.10~2.50%; N: ≤0.020%； O: ≤0.003%； Zr: 0.05-0.11%, the balance is Co and inevitable impurities.

2. A strong high temperature alloy easy to weld according to claim 1, characterized in that: C：0.06%； Si: 0.45%; Mn: 0.80%; Cr ：15.0%； AL: 0.20%; S ：0.007%； P ：0.020%； Fe: 1.0%; La: 0.050%; Ce: 0.15%; N: 0.020%； O: 0.003% Zr： 0.06%。 3. The strong high temperature alloy easy to weld according to claim 1, characterized in that: C：0.03%； Si: 0.38%; Mn: 0.20%; Cr ：18.0%； AL: 0.40%; S ：0.004%； P ：0.020%； Fe: 1.0%; La: 0.060%; Ce: 0.2%; N: 0.020%； O: 0.003% Zr： 0.07%。 4. The strong high temperature alloy easy to weld according to claim 1, characterized in that: C：0.02%； Si: 0.35%; Mn: 0.80%; Cr ：18.0%； AL: 0.10%; S ：0.006%； P ：0.010%； Fe: 1.0%; La: 0.050%; Ce: 0.10%; N: 0.010%； O: 0.003% Zr： 0.08%。 5. The strong high temperature alloy easy to weld according to claim 1, characterized in that: C：0.06%； Si: 0.55%; Mn: 0.80%; Cr ：16.5%； AL: 0.20%; S ：0.003%； P ：0.020%； Fe: 0.5%; La: 0.060%; Ce: 0.18%; N: 0.010%； O: 0.003% Zr： 0.09%。 6. The method for preparing a strong high-temperature alloy that is easy to weld according to claim 1, comprising the following steps: 1) Vacuum smelting, charging in the furnace, charging order: deoxidized carbon 1 / 3 → Ni plate → Cr → Co → W, degassing carbon 1 / 3 → small materials are added to the hopper separately C → Mn → Ti → Al, the vacuum degree during the melting period is less than 8Pa, Ni-Mg 0.05% is added for refining, rare earth 0.05% is added, Al and Ti are added in the later stage of refining and melted evenly, the vacuum degree during the refining period is ≤5Pa, and at least two high-temperature instantaneous refining and one low-temperature long refining are used. The steel temperature is raised to 1520℃ / 1-2min, and the steel temperature is lowered to 1 420℃ (just formed the film and punched the film) low temperature, then adjust the refining temperature to 1520℃, refining time ≥45min, add deoxidized carbon, take samples for alloying to adjust the chemical composition, refining and stirring evenly, adjust the steel tapping temperature to 1540℃, pour 38kg electrode and fully compensate for shrinkage in the later stage, cool for 20 minutes and mark the furnace number before demolding; 2) Electroslag, cut off the head and tail and end shrinkage holes at both ends of the electrode rod, locally grind the surface defects, and weld more than 100kg / piece; electroslag slag system: CaF2: AL2O3: CaO: MgO = 60: 20: 10: 10, power system: voltage 50-55V, current 3000-4000A, electroslag 100kg electroslag ingot * 3 pieces; 3) Forging, ingot heating 1160-1180℃, set temperature 1170℃, start forging temperature ≥1140℃, final forging temperature ≥950℃. Tempering forging is more than 120 minutes, and the forging operation is controlled to prevent corner cracks. The forging specification is S=40*215*800-1100mm. The defects are removed by flaw detection, and the surface is polished and bright without warping and cracks. The surface is 100% visually inspected and penetrated and qualified before being transferred to the next process; 4) Hot rolling, heating to 1160℃-1180℃, holding for ≥60 minutes, starting rolling temperature ≥1140℃, final rolling ≥980℃, rolling specification S=3*220*L loose coil, and the steel strip is air-cooled; 5) Cold rolling and heat treatment, strip heat treatment temperature: 1140℃~1160℃, holding for ≥45 minutes, water cooling, alkali pickling and pickling, the surface is clean without oxide scale, black spots, surface cracks, grinding and polishing, cold rolling production adopts multiple cold rolling annealing for production, deformation control is based on the hardening degree of the material, bright annealing temperature: 1120℃.