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CN-121988618-A - Rolling and temperature control process for 04Cr16Ni5Mo stainless steel plate

CN121988618ACN 121988618 ACN121988618 ACN 121988618ACN-121988618-A

Abstract

The invention relates to the technical field of martensitic steel, in particular to a04 Cr16Ni5Mo stainless steel plate rolling and temperature control process, wherein a three-stage heating mode (the preheating rate is less than or equal to 4 ℃ per minute, the soaking rate is more than or equal to 2.5 h) and inert gas introduction are adopted in the process through a heating method, the low heat conduction characteristic of 04Cr16Ni5Mo is adapted, the temperature difference between a surface layer and a center is reduced, thermal stress cracks are avoided, the problem of insufficient adaptation of physical properties is solved, the differential temperature and the heat preservation time are set in the heat treatment provided by the invention, the various heat treatment requirements of the steel type are precisely matched, the problem of mismatch of the heat treatment process is solved, the defect is removed, the leveling and flatness control and the slow cooling control structure are realized in the whole process of the cooperative blank pretreatment, the quality of a finished product is further ensured, the corrosion source after rolling and the deformation after the heat treatment are avoided, and the corrosion resistance and the structural stability of the steel are improved.

Inventors

  • LU WENMIN
  • DONG WEI
  • Si Qizhe

Assignees

  • 江苏境合金属科技有限公司
  • 西北农林科技大学

Dates

Publication Date
20260508
Application Date
20260209

Claims (10)

  1. 1. A04 Cr16Ni5Mo stainless steel plate rolling and temperature control process is characterized by comprising the following steps: Heating the pretreated stainless steel blank at a heating rate of 0< heating rate less than or equal to 4 ℃ per minute, heating to 790-810 ℃ from room temperature, preheating, heating to 1190-1210 ℃ after preheating, and preserving heat for 30min to perform heating pretreatment, soaking in inert gas atmosphere for more than or equal to 2.5h after heating pretreatment, and cooling to 1140-1160 ℃ after soaking to obtain the stainless steel blank to be rolled; Carrying out multi-pass rough rolling and multi-pass finish rolling on the stainless steel blank to be rolled, wherein the finish rolling temperature is more than or equal to 950 ℃, the finish rolling temperature after finish rolling is 850-920 ℃, the reduction rate of each pass of rough rolling and finish rolling is 12-15%, and the reduction of the finish rolling pass is reduced to 8%, so as to obtain a rolled plate; Straightening the rolled plate, slowly cooling the straightened plate in an environment with the temperature of more than or equal to 550 ℃ for 10-12 hours, and naturally cooling the plate to room temperature after slow cooling; And (3) carrying out annealing treatment or quenching tempering heat treatment on the naturally cooled plate, wherein the annealing temperature is 600-650 ℃, the temperature of the plate with the thickness of 85mm is more than or equal to 3 hours, the temperature of the plate with the thickness of 115mm is more than or equal to 4 hours, the plate is naturally cooled to room temperature, the quenching temperature is 900-1050 ℃, the temperature of the plate with the thickness of 85mm is 1.5-2 hours, the temperature of the plate with the thickness of 115mm is 2-2.5 hours, the oil cooling or air cooling is carried out to 550-650 ℃, the temperature of the plate with the thickness of 85mm is 5.5-6 hours, the temperature of the plate with the thickness of 115mm is 7.5-8 hours, and the plate is naturally cooled to room temperature.
  2. 2. The process for rolling and controlling the temperature of the 04Cr16Ni5Mo stainless steel plate according to claim 1, wherein the thickness of the blank is more than or equal to 320mm.
  3. 3. The process for rolling and controlling the temperature of the 04Cr16Ni5Mo stainless steel plate according to claim 1, wherein the stainless steel blank is removed with surface oxide skin and pits, the thickness of the removed surface oxide skin is more than or equal to 2mm, and the depth of the removed pits is more than or equal to 2mm.
  4. 4. The 04Cr16Ni5Mo stainless steel plate rolling and temperature controlling process according to claim 1, wherein the straightening speed in the straightening treatment is 1.5m/min, and the flatness of the plate after the straightening treatment is 0-2 mm/m.
  5. 5. The process for rolling and controlling the temperature of the 04Cr16Ni5Mo stainless steel plate according to claim 1, wherein the temperature of the stainless steel blank to be rolled after rough rolling for a plurality of times is equal to or higher than 1050 ℃.
  6. 6. The process for rolling and controlling the temperature of the 04Cr16Ni5Mo stainless steel plate according to claim 1, wherein phosphorus is removed 1 time after rough rolling.
  7. 7. A04 Cr16Ni5Mo stainless steel plate is characterized in that the 04Cr16Ni5Mo stainless steel plate is manufactured by adopting the rolling and temperature control process of any one of claims 1-6.
  8. 8. The 04Cr16Ni5Mo stainless steel sheet according to claim 7, wherein the elastic modulus is not less than 200GPa, and the thermal conductivity is not less than 15W-m -1 ·K -1 .
  9. 9. The 04Cr16Ni5Mo stainless steel sheet according to claim 7, wherein the 04Cr16Ni5Mo stainless steel sheet after annealing treatment has a tensile strength of <1150MPa, a hardness HB <380, and the 04Cr16Ni5Mo stainless steel sheet after quenching and tempering heat treatment has a tensile strength of 760MPa to 1150MPa, a yield strength of >550MPa, an elongation of >10%, and an impact energy of >55J at 20 ℃.
  10. 10. The 04Cr16Ni5Mo stainless steel sheet according to claim 6, wherein the 04Cr16Ni5Mo stainless steel sheet is free from cracks and blisters after 100% flaw detection.

Description

Rolling and temperature control process for 04Cr16Ni5Mo stainless steel plate Technical Field The invention relates to the technical field of stainless steel rolling methods, in particular to a 04Cr16Ni5Mo stainless steel plate rolling and temperature control process. Background As a martensitic steel, 04Cr16Ni5Mo stainless steel is favored in the field of hydroelectric engineering and the like due to its excellent mechanical properties and corrosion resistance, and is often manufactured into thick plates of 85mm, 115mm and the like. Currently, the main stainless steel rolling process (the core flow of which comprises blank pretreatment, heating, rolling, straightening, cooling, heat treatment and detection) is mainly designed for common austenitic or ferritic steel types. However, the existing general flow cannot be specially optimized for the martensitic characteristics of 04Cr16Ni5Mo stainless steel, which restricts the further improvement and stabilization of the performance of the thick plate product to a certain extent. The 04Cr16Ni5Mo stainless steel prepared by adopting a stainless steel rolling process designed for common austenitic or ferritic steel has the obvious process defects of thermal stress crack, poor mechanical property, easy generation of corrosion source after rolling, deformation after heat treatment and insufficient corrosion resistance and structural stability. Therefore, it is necessary to solve the problems of thermal stress cracks and poor mechanical properties of the 04Cr16Ni5Mo stainless steel prepared by the prior art, and to improve the corrosion resistance and structural stability of the 04Cr16Ni5Mo stainless steel. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a 04Cr16Ni5Mo stainless steel plate rolling and temperature controlling process, which solves the problems of thermal stress cracks and poor mechanical properties of the prepared 04Cr16Ni5Mo stainless steel and improves the corrosion resistance and structural stability of the 04Cr16Ni5Mo stainless steel. In order to solve the technical problems, the invention provides an implementation scheme for rolling and controlling the temperature of a 04Cr16Ni5Mo stainless steel plate, which comprises the following steps: Heating the pretreated stainless steel blank at a heating rate of less than or equal to 4 ℃ per minute at a temperature of 0 ℃ per minute, heating to 790-810 ℃ from room temperature, preheating, heating to 1190-1210 ℃ after pretreatment, and heating for 30min, soaking for more than or equal to 2.5h at the temperature of the heating pretreatment in the atmosphere of inert gas after the heating treatment, and cooling to 1140-1160 ℃ after soaking to obtain the stainless steel blank to be rolled; carrying out multi-pass rough rolling and multi-pass finish rolling on the stainless steel blank to be rolled, wherein the finish rolling temperature is more than or equal to 950 ℃, the finish rolling temperature after finish rolling is 850-920 ℃, the reduction rate of each pass of rough rolling and finish rolling is 12-15%, and the reduction of the finish rolling pass is reduced to 8%, so as to obtain a rolled plate; Straightening the rolled plate, slowly cooling the straightened plate in an environment with the temperature of more than or equal to 550 ℃ for 10-12 hours, and naturally cooling the plate to room temperature after slow cooling; And (3) carrying out annealing treatment or quenching tempering heat treatment on the naturally cooled plate, wherein the annealing temperature is 600-650 ℃, the temperature of the plate with the thickness of 85mm is more than or equal to 3 hours, the temperature of the plate with the thickness of 115mm is more than or equal to 4 hours, (naturally cooling to room temperature) and air or furnace cooling, the quenching temperature is 900-1050 ℃, the temperature of the plate with the thickness of 85mm is 1.5-2 hours, the temperature of the plate with the thickness of 115mm is 2-2.5 hours, the oil cooling or air cooling is carried out to 550-650 ℃, the tempering heating is carried out, the temperature of the plate with the thickness of 85mm is 5.5-6 hours, the temperature of the plate with the thickness of 115mm is 7.5-8 hours, and the plate with the thickness of 115mm is naturally cooled to room temperature. When the quenching temperature is 950-1050 ℃, the plate with the thickness of 85mm is insulated for 2 hours, the plate with the thickness of 115mm is insulated for 2.5 hours, after oil cooling or air cooling, the plate with the thickness of 85mm is tempered and heated at 590-620 ℃, the plate with the thickness of 85mm is insulated for 6 hours, the plate with the thickness of 115mm is insulated for 8 hours, and quenching and tempering heat treatment under the condition of QT760 is carried out; When the quenching temperature is 950-1050 ℃, the temperature of the plate with the thickness of 85mm is kept for 2 hours, the temperatur