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CN-121315028-B - Low-cost iron-nickel-based heat-resistant alloy and high-speed rolling method thereof

CN121315028BCN 121315028 BCN121315028 BCN 121315028BCN-121315028-B

Abstract

The invention relates to a low-cost iron-nickel-based heat-resistant alloy and a high-speed rolling method thereof, belongs to the technical field of special alloy manufacturing, and solves the technical problems of cracking, short service life of a knife edge, high energy consumption of subsequent solution treatment, low efficiency and the like caused by uneven temperature rise and cooling of materials in the conventional high-speed rolling of heat-resistant alloy. The method of the invention sequentially passes the heated heat-resistant alloy rolled blank through a rough rolling unit, a medium rolling unit and a finishing mill unit, at least two cooling devices are arranged at key positions of the middle and rear sections of the finishing mill unit, the wire is intermittently sprayed and cooled by using polyacrylamide aqueous solution containing alumina powder with specific granularity and proportion, and the finished wire directly enters a solution furnace for on-line solution treatment and water cooling. The method realizes the integrated production of the heat-resistant alloy wire with high efficiency, high quality and low energy consumption in the whole process from rolling to heat treatment, and the prepared wire has uniform structure and excellent performance and is particularly suitable for manufacturing the engine air valve.

Inventors

  • WANG LIMIN
  • CHEN GUN
  • JIA LEI
  • CHENG JIEFENG
  • LI QUAN
  • TANG ZHENGXIN
  • LI GEN
  • LIU HUASONG

Assignees

  • 钢铁研究总院有限公司

Dates

Publication Date
20260508
Application Date
20251203

Claims (8)

  1. 1. The high-speed rolling method of the low-cost iron-nickel-based heat-resistant alloy wire is characterized by comprising the following steps of: s1, heating, namely heating and preserving heat of a heat-resistant alloy rolled blank for 2-2.5 hours at 1140-1150 ℃; s2, high-speed continuous rolling and temperature control, namely rolling the heated rolled blank sequentially through a rough rolling mill, a medium rolling mill and a finish rolling mill group to finally obtain a finished product wire with the diameter of phi 5.0 mm-phi 10 mm; wherein, in the finish rolling process, at least one cooling device is respectively arranged in a deformation heat main accumulation area and a grain shaping key area of the finish rolling unit to perform intermittent jet cooling on the running wire, The cooling medium consists of a polyacrylamide aqueous solution and 10% -20% of alumina powder dispersed in the polyacrylamide aqueous solution, wherein the mass fraction of polyacrylamide in the polyacrylamide aqueous solution is 0.5% -2.0%, the granularity of the alumina powder is 0.20-0.50 mu m, and the purity of the alumina powder is 99.99%; S3, on-line solution quenching, namely, directly feeding the finished wire into a solution furnace for on-line solution treatment after spinning, wherein the solution temperature is 980-990 ℃, and the wire is directly water-cooled after heat preservation for 15-20 minutes.
  2. 2. The method according to claim 1, wherein in the step of S2 high-speed continuous rolling and temperature control, the temperature of the wire at the outlet of the intermediate rolling mill group is controlled to 1040 ℃ -1050 ℃, the rolling speed is 110-115 m/S, and the temperature of the wire at the outlet of the finishing mill group is controlled to 1030 ℃ -1040 ℃, and the rolling speed is 115-120 m/S.
  3. 3. The method according to claim 1, wherein in the step of S2 high-speed continuous rolling and temperature control, a high-speed flying shear is used at an inlet of a finishing mill group to cut or segment a rolled material, and a knife edge of the high-speed flying shear is made of martensitic heat-strength steel 1Cr16Ni2MoN.
  4. 4. The method according to claim 1, wherein the heat-resistant alloy comprises the chemical components of ：C:0.03～0.10％,Si:0.05～0.4％,Mn:0.10～0.60％,P:≤0.020％,S:≤0.020％,Cr:15.00～18.00％,Ni:24.0～30.0%,Al:0.80～2.00%,Ti:1.85～3.00%,Nb:0.30～1.30%,V:0.20～0.50%,% by mass of Fe and unavoidable impurities as the remainder.
  5. 5. A cooling medium for use in the method of any one of claims 1 to 4.
  6. 6. A heat resistant alloy prepared by the method of any one of claims 1 to 4.
  7. 7. The heat resistant alloy according to claim 6, wherein the heat resistant alloy has a metallographic structure of a uniform austenitic matrix and a grain size grade of ASTM 6-10.
  8. 8. An engine valve, characterized in that it is manufactured from the heat-resistant alloy according to claim 6 or 7 as a raw material.

Description

Low-cost iron-nickel-based heat-resistant alloy and high-speed rolling method thereof Technical Field The invention relates to the technical field of special alloy manufacturing, in particular to a low-cost iron-nickel-based heat-resistant alloy and a high-speed rolling method thereof. Background Heat-resistant alloys, particularly iron-nickel-chromium-based austenitic heat-resistant alloys, have become core materials for manufacturing key high-temperature components such as high-performance engine intake and exhaust valves due to their excellent high-temperature strength, creep resistance and oxidation resistance. With the continuous improvement of the efficiency and the power requirements of the engine, the performance requirements of the air valve alloy are increasingly severe, and meanwhile, the reduction of the production cost of the air valve alloy is also a key for keeping competitiveness in the market. At present, the large-scale production of the heat-resistant alloy wires generally adopts a hot continuous rolling process. However, the prior art rolling technology faces a serious challenge for iron-nickel-chromium-based heat resistant alloys with high alloying element content and narrow hot working window. Firstly, the high-speed rolling adopted for realizing high-efficiency production can generate obvious deformation heat in the material, if insufficient cooling is adopted, the weakening and even cracking of internal crystal boundary are easily caused, and if the traditional water cooling is adopted for forced cooling, the temperature difference between the surface of the material and the core part is too large due to the fact that the cooling is too severe, and the cracking or surface defect can be also induced. For this reason, there are attempts to use cooling oil for mild cooling, but the cooling capacity thereof is often insufficient to suppress the material temperature rise under high-speed rolling, and the effect is limited. Secondly, when alloy blanks with high temperature and high strength are continuously sheared by a flying shear blade at the inlet of a finishing mill group in a high-speed rolling line, the common die steel blade (such as H13) is extremely fast in abrasion due to insufficient high-temperature hardness and oxidation resistance, frequent shutdown and replacement are required, the production continuity is seriously broken, and the overall efficiency is restricted. In addition, the rolled heat-resistant alloy is required to be subjected to solution treatment to optimize the structure, and the existing process generally adopts a single solution heat treatment furnace, so that the process has high energy consumption and long production period, and forms an important component of the production cost. The prior art lacks a comprehensive solution capable of systematically solving a series of interrelated problems of difficult temperature control, short service life of key parts and high energy consumption of subsequent heat treatment in the high-speed rolling process, which severely restricts the high-efficiency, high-quality and low-cost manufacturing of high-performance heat-resistant alloy wires. Disclosure of Invention In view of the above analysis, the present invention aims to provide a low-cost iron-nickel-based heat-resistant alloy and a high-speed rolling method thereof, which are used for at least solving one of the technical problems of difficult material internal temperature rise control, short service life of a flying shear nozzle, high energy consumption of post-rolling solution treatment and breakage in the process when the iron-nickel-chromium-based heat-resistant alloy is rolled at high speed in the prior art. On one hand, the embodiment of the invention provides a high-speed rolling method of a low-cost iron-nickel-based heat-resistant alloy wire, which comprises the following steps of: s1, heating, namely heating and preserving heat of a heat-resistant alloy rolled blank for 2-2.5 hours at 1140-1150 ℃; s2, high-speed continuous rolling and temperature control, namely rolling the heated rolled blank sequentially through a rough rolling mill, a medium rolling mill and a finish rolling mill group to finally obtain a finished product wire with the diameter of phi 5.0 mm-phi 10 mm; in the finish rolling process, intermittent spray cooling is carried out on the running wire, the cooling medium is polyacrylamide aqueous solution containing 10% -20% of alumina powder by mass fraction, and the granularity of the alumina powder is 0.20-0.50 mu m; S3, on-line solution quenching, namely, directly feeding the finished wire into a solution furnace for on-line solution treatment after spinning, wherein the solution temperature is 980-990 ℃, and the wire is directly water-cooled after heat preservation for 15-20 minutes. Further, in the step of S2 high-speed continuous rolling and temperature control, at least one cooling device is respectively arranged in a deformation heat