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CN-121992293-A - High-strength tubular pile steel die and processing and forming process thereof

CN121992293ACN 121992293 ACN121992293 ACN 121992293ACN-121992293-A

Abstract

The invention discloses a high-strength wear-resistant pipe pile steel die and a processing and forming process thereof, comprising the following steps: the composite material consists of the following components in percentage by weight: c: 0.28-0.38%, si: 0.30-0.60%, mn: 1.20-1.80%, cr: 0.80-1.50%, mo: 0.20-0.40%, ni: 0.30-0.80%, V: 0.05-0.15%, nb: 0.02-0.06%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, and the balance is Fe and unavoidable impurities. The steel mould prepared by the invention has excellent strength, toughness, wear resistance and thermal fatigue resistance, remarkably prolongs the service life, and is suitable for severe tubular pile production working conditions.

Inventors

  • SHI LIXIA

Assignees

  • 壹马高科技发展(江苏)有限公司

Dates

Publication Date
20260508
Application Date
20251230

Claims (8)

  1. 1. A high-strength wear-resistant tubular pile steel mould is characterized by comprising the following components in percentage by weight ：C：0.28~0.38%,Si：0.30~0.60%,Mn：1.20~1.80%,Cr：0.80~1.50%, Mo：0.20~0.40%, Ni：0.30~0.80%,V：0.05~0.15%,Nb：0.02~0.06%,P≤0.015%, S≤0.010%, and the balance of Fe and unavoidable impurities.
  2. 2. The high-strength wear-resistant pipe pile steel mould according to claim 1, which is characterized by comprising the following components, by weight, 0.28% of C, 0.30% of Si, 1.20% of Mn, 0.80% of Cr, 0.20% of Mo, 0.30% of Ni, 0.05% of V, 0.02% of Nb, 0.005% of P, 0.003% of S, and the balance of Fe and unavoidable impurities.
  3. 3. The high-strength wear-resistant pipe pile steel mould according to claim 1, which is characterized by comprising the following components, by weight, 0.33% of C, 0.45% of Si, 1.50% of Mn, 1.20% of Cr, 0.30% of Mo, 0.55% of Ni, 0.10% of V, 0.04% of Nb, 0.010% of P, 0.016% of S, and the balance of Fe and unavoidable impurities.
  4. 4. The high-strength wear-resistant pipe pile steel mould according to claim 1, which is characterized by comprising the following components, by weight, 0.38% of C, 0.60% of Si, 1.80% of Mn, 1.50% of Cr, 0.40% of Mo, 0.80% of Ni, 0.15% of V, 0.06% of Nb, 0.015% of P, 0.010% of S, and the balance of Fe and unavoidable impurities.
  5. 5. A process for preparing the high-strength wear-resistant pipe pile steel mould according to any one of claims 1 to 5, which is characterized by comprising the following steps: s1, smelting and casting, namely smelting in an electric furnace or a converter according to the proportion, and casting into steel ingots or continuously casting into billets after external refining and vacuum degassing; S2, forging and rolling, namely heating a steel ingot or a continuous casting blank to 1180-1250 ℃, carrying out multi-directional forging or rolling after heat preservation, and manufacturing a steel plate or a module, wherein the final forging and final rolling temperature is not lower than 900 ℃; s3, performing preliminary heat treatment, namely normalizing the formed workpiece at 900-940 ℃ and then air-cooling; S4, final heat treatment, comprising the following substeps: S41, quenching, namely heating a workpiece to 880-910 ℃ for austenitizing, preserving heat, adopting gradient temperature control quenching, quenching in a nitrate bath at 260-320 ℃ for 3-8 minutes, and then moving to a low-temperature salt bath at 140-180 ℃ for continuous cooling to room temperature; And S42, tempering, namely heating the quenched workpiece to 560-620 ℃, preserving heat for a sufficient time, and discharging and air cooling.
  6. 6. The process for forming the steel die for the high-strength wear-resistant pipe pile according to claim 5, wherein after tempering in the step S42, a stress relief tempering step is further included, the heating temperature is 480-520 ℃, and the heat preservation time is 1/3-1/2 of the final tempering heat preservation time.
  7. 7. The process for forming the high-strength wear-resistant tubular pile steel mould according to claim 5, wherein after finishing the final heat treatment, the surface strengthening treatment is performed on the inner wall working surface of the steel mould, the surface strengthening treatment is laser cladding or plasma spraying, and the cladding or spraying material is a cobalt-based or nickel-based tungsten carbide cermet layer.
  8. 8. The process for forming the high-strength abrasion-resistant tubular pile steel mould according to claim 5, wherein the mould segments of the split steel mould are required to be integrally forged in the step S2, are subjected to the treatment of the steps S3 and S4, are then divided along a preset parting plane by adopting a linear cutting or water jet cutting process, the parting plane is subjected to fine grinding after division, and are subjected to local overlaying welding by adopting a low-hydrogen welding rod to correct the size, and the stress relief tempering is required after overlaying welding.

Description

High-strength tubular pile steel die and processing and forming process thereof Technical Field The invention belongs to the field of tubular pile steel moulds, and particularly relates to a high-strength tubular pile steel mould and a processing and forming process thereof. Background The pipe pile is used as an important basic building material, and in the production process, the steel mould needs to bear severe scouring of concrete slurry, alternating temperature stress and mechanical abrasion in the demoulding process, and the working condition is extremely severe. The traditional tubular pile steel mould is mostly made of medium carbon steel or common alloy steel, and the wear resistance, the toughness and the thermal fatigue resistance of the traditional tubular pile steel mould are often difficult to be simultaneously considered. The conventional heat treatment process is easy to cause uneven properties of the core part and the surface of the die or generate larger tissue stress, and the problems of early abrasion, surface cracking, brittle fracture and the like easily occur in use, so that the production efficiency and the service life of the die are seriously influenced. Therefore, the novel tubular pile steel die and the processing and forming process which are scientific in component design and optimized in heat treatment process, can obtain high and uniform comprehensive mechanical properties, and particularly have high surface wear resistance and good core toughness, so that the service life is remarkably prolonged, and have important practical significance. Disclosure of Invention In view of the above, the invention aims to provide a high-strength tubular pile steel die and a processing and forming process. Solves the problems of early abrasion, cracking and short service life caused by insufficient wear resistance, toughness and thermal fatigue resistance of the traditional tubular pile steel die, and improves the comprehensive performance by optimizing the alloy components, gradient temperature control quenching and other processes. In order to solve the technical problems, the invention discloses a novel tubular pile steel die and a processing and forming process, wherein the novel tubular pile steel die comprises ：C：0.28~0.38%,Si：0.30~0.60%,Mn：1.20~1.80%,Cr：0.80~1.50%, Mo：0.20~0.40%, Ni：0.30~0.80%,V：0.05~0.15%,Nb：0.02~0.06%,P≤0.015%, S≤0.010%, weight percent of Fe and unavoidable impurities. According to an embodiment of the present invention, the composition comprises, by weight, 0.28% of C, 0.30% of Si, 1.20% of Mn, 0.80% of Cr, 0.20% of Mo, 0.30% of Ni, 0.05% of V, 0.02% of Nb, 0.005% of P, 0.003% of S, and the balance of Fe and unavoidable impurities. According to an embodiment of the present invention, the composition comprises, by weight, 0.33% of C, 0.45% of Si, 1.50% of Mn, 1.20% of Cr, 0.30% of Mo, 0.55% of Ni, 0.10% of V, 0.04% of Nb, 0.010% of P, 0.016% of S, and the balance of Fe and unavoidable impurities. According to an embodiment of the present invention, the composition comprises, by weight, 0.38% of C, 0.60% of Si, 1.80% of Mn, 1.50% of Cr, 0.40% of Mo, 0.80% of Ni, 0.15% of V, 0.06% of Nb, 0.015% of P, 0.010% of S, and the balance of Fe and unavoidable impurities. According to an embodiment of the present invention, the process for forming the alloy for the steel die of the high-strength wear-resistant pipe pile includes the following steps: s1, smelting and casting, namely smelting in an electric furnace or a converter according to a proportion, and casting into steel ingots or continuously casting into billets after external refining and vacuum degassing; S2, forging and rolling, namely heating a steel ingot or a continuous casting blank to 1180-1250 ℃, carrying out multi-directional forging or rolling after heat preservation, and manufacturing a steel plate or a module, wherein the final forging and final rolling temperature is not lower than 900 ℃; s3, performing preliminary heat treatment, namely normalizing the formed workpiece at 900-940 ℃ and then air-cooling; S4, final heat treatment, comprising the following substeps: S41, quenching, namely heating a workpiece to 880-910 ℃ for austenitizing, preserving heat, adopting gradient temperature control quenching, quenching in a nitrate bath at 260-320 ℃ for 3-8 minutes, and then moving to a low-temperature salt bath at 140-180 ℃ for continuous cooling to room temperature; And S42, tempering, namely heating the quenched workpiece to 560-620 ℃, preserving heat for a sufficient time, and discharging and air cooling. According to an embodiment of the present invention, after tempering in the step S42, a stress relief tempering step is further included, the heating temperature is 480-520 ℃, and the heat preservation time is 1/3-1/2 of the final tempering heat preservation time. According to an embodiment of the present invention, after the final heat treatment is completed, the surface strengthening treatment is performed