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CN-121976027-A - Control method and system for copper embrittlement defect of corrosion-resistant steel and corrosion-resistant steel hot rolled plate

CN121976027ACN 121976027 ACN121976027 ACN 121976027ACN-121976027-A

Abstract

The application belongs to the technical field of pipeline materials, and particularly relates to a control method and system for copper embrittlement defects of corrosion-resistant steel and a corrosion-resistant steel hot rolled plate. The method comprises the steps of heating a copper-containing corrosion-resistant steel slab, wherein the heating comprises a preheating section, a first heating section, a second heating section and a soaking section, the temperature of the copper-containing corrosion-resistant steel slab at an outlet of the first heating section is controlled to be 920-1070 ℃, the steel burning temperature of the second heating section is controlled to be more than 1200 ℃ so that the heating rate of the copper-containing corrosion-resistant steel slab in the second heating section is more than or equal to 1.5 ℃ per second, the heating atmosphere is controlled to be a weak oxidizing atmosphere, the lambda value of the weak oxidizing atmosphere is 0.93-1.0, the total furnace time of the copper-containing corrosion-resistant steel slab is controlled to be less than or equal to 360min, the accumulated time of the copper-containing corrosion-resistant steel slab in the second heating section and the soaking section is controlled to be less than or equal to 80min, and the tapping temperature of the copper-containing corrosion-resistant steel slab is controlled to be less than 1210 ℃ or equal to 1280 ℃. The problem of copper embrittlement of the corrosion-resistant steel copper is solved.

Inventors

  • WU LIHUAN
  • PENG XUAN
  • HU JIFEI
  • TANG ZHONGJIE
  • CAO YONG
  • WANG LU
  • GAO KANG
  • LI HAIMING
  • XU WEI
  • LIU YUEPING
  • ZHAO JINYONG
  • LIU DONGWANG
  • YANG JINHUI
  • FU LIANG
  • LI HONGJUN

Assignees

  • 北京首钢股份有限公司

Dates

Publication Date
20260505
Application Date
20260126

Claims (10)

  1. 1. The method for controlling the copper embrittlement defect of the corrosion-resistant steel is characterized by comprising the following steps of: heating a copper-containing corrosion-resistant steel slab, wherein the heating comprises a preheating section, a first heating section, a second heating section and a soaking section; Controlling the temperature of the copper-containing corrosion-resistant steel slab at the outlet of the first heating section to be 920-1070 ℃; Controlling the steel burning temperature of the second heating section to be more than 1200 ℃ so that the temperature rising rate of the copper-containing corrosion-resistant steel plate blank in the second heating section is more than or equal to 1.5 ℃ per second; Controlling the heating atmosphere to be a weak oxidizing atmosphere, wherein the lambda value of the weak oxidizing atmosphere is 0.93-1.0; controlling the total time in the furnace of the copper-containing corrosion-resistant steel slab to be less than or equal to 360min, and controlling the accumulated time of the copper-containing corrosion-resistant steel slab in the second heating section and the soaking section to be less than or equal to 80min; controlling the tapping temperature of the copper-containing corrosion-resistant steel slab to be less than 1210 ℃ or more than or equal to 1280 ℃.
  2. 2. The method for controlling copper embrittlement of corrosion resistant steel according to claim 1, wherein the lambda target value of the weakly oxidizing atmosphere is 0.95 to 0.98.
  3. 3. The method for controlling copper embrittlement of corrosion resistant steel according to claim 1, wherein the chemical composition of the copper-containing corrosion resistant steel slab contains ：Cu 0.20%～0.35%,Ni≤0.15%,C≤0.12%,Si 0.20%～0.50%,Mn 0.30%～0.60%,P 0.06%～0.10%,S≤0.015%,Cr 0.20%～0.50%,Ti 0.02%～0.08%, the balance of Fe and unavoidable impurities in mass fraction.
  4. 4. A method of controlling copper embrittlement of corrosion resistant steel according to any one of claims 1 to 3, wherein the method further comprises: And in the scheduling stage, the heating plan of the copper-containing corrosion-resistant steel slab is isolated from the plan of other steel types with tapping temperature more than or equal to 1260 ℃ or in-furnace time more than or equal to 200 min.
  5. 5. The method for controlling copper embrittlement defects of corrosion resistant steel according to claim 4, wherein the isolation schedule is implemented by inserting a blank time or a transition steel grade schedule having an insert tapping temperature of 1250 ℃ or less and an in-furnace time of 180min or less between the heating schedule and the two schedules of the other steel grade schedule.
  6. 6. A hot-rolled corrosion-resistant steel sheet, characterized in that it is produced by the method for controlling copper embrittlement defects of corrosion-resistant steel according to any one of claims 1to 5, the surface copper embrittlement crack length of which is 5mm or less, and the crack density of which is 1 bar/m 2 or less.
  7. 7. The hot rolled corrosion resistant steel sheet as claimed in claim 6, wherein the chemical composition of the hot rolled corrosion resistant steel sheet has Ni content of 0.05% or less.
  8. 8. The hot rolled corrosion resistant steel sheet according to claim 6, wherein the thickness of the hot rolled corrosion resistant steel sheet is 1.5mm to 6.0mm, the yield strength is not less than 345MPa, the tensile strength is not less than 480MPa, and the elongation after break is not less than 22%.
  9. 9. A production system of a corrosion resistant steel hot rolled sheet, comprising: the heating furnace is sequentially provided with a preheating section, a first heating section, a second heating section and a soaking section along the travelling direction of the plate blank; The temperature detection unit is arranged at the first heating section outlet, the second heating section outlet and the soaking section outlet; the combustion control unit is used for independently adjusting the burner powers of the first heating section, the second heating section and the soaking section; An atmosphere control unit for adjusting a lambda value in the heating furnace; A controller in signal connection with the temperature detection unit, the combustion control unit and the atmosphere control unit, the controller being configured to perform the method of controlling the corrosion resistant steel copper embrittlement defect of any one of claims 1 to 5.
  10. 10. The corrosion resistant steel hot rolled sheet production system of claim 9, wherein the controller is further configured to: When detecting that the tapping temperature of the copper-containing corrosion-resistant steel slab is within a range of 1210-1279 ℃, the controller sends an alarm signal and automatically increases the burner power of the second heating section and/or the soaking section until the tapping temperature is less than 1210 ℃ or more than or equal to 1280 ℃.

Description

Control method and system for copper embrittlement defect of corrosion-resistant steel and corrosion-resistant steel hot rolled plate Technical Field The application belongs to the technical field of hot rolled strip steel manufacturing, and particularly relates to a control method and system for copper embrittlement defects of corrosion-resistant steel and a corrosion-resistant steel hot rolled plate. Background Corrosion resistant steel improves atmospheric corrosion resistance by adding copper, but copper melting point is only 1083 ℃. Copper brittle cracks on the surface of the corrosion resistant steel are easy to induce in the hot rolling heating process. In addition, the prior art lacks a reproducible scheduling-heating coupling parameter system, has poor adaptability to complex scenes of multi-specification and multi-plan co-furnace production, causes frequent occurrence of copper embrittlement defects, reduces yield and increases subsequent grinding cost. Disclosure of Invention The application provides a control method and a control system for copper embrittlement defects of corrosion-resistant steel and a corrosion-resistant steel hot rolled plate, which aim to solve the technical problems of how to solve the problem of copper embrittlement cracks of corrosion-resistant steel with low cost. In a first aspect, an embodiment of the present application provides a method for controlling a copper embrittlement defect of corrosion resistant steel, including the steps of: heating a copper-containing corrosion-resistant steel slab, wherein the heating comprises a preheating section, a first heating section, a second heating section and a soaking section; Controlling the temperature of the copper-containing corrosion-resistant steel slab at the outlet of the first heating section to be 920-1070 ℃; Controlling the steel burning temperature of the second heating section to be more than 1200 ℃ so that the temperature rising rate of the copper-containing corrosion-resistant steel plate blank in the second heating section is more than or equal to 1.5 ℃ per second; Controlling the heating atmosphere to be a weak oxidizing atmosphere, wherein the lambda value of the weak oxidizing atmosphere is 0.93-1.0; controlling the total time in the furnace of the copper-containing corrosion-resistant steel slab to be less than or equal to 360min, and controlling the accumulated time of the copper-containing corrosion-resistant steel slab in the second heating section and the soaking section to be less than or equal to 80min; controlling the tapping temperature of the copper-containing corrosion-resistant steel slab to be less than 1210 ℃ or more than or equal to 1280 ℃. Optionally, the lambda target value of the weak oxidizing atmosphere is 0.95-0.98. Optionally, the chemical components of the copper-containing corrosion-resistant steel slab comprise ：Cu 0.20%～0.35%,Ni≤0.15%,C≤0.12%,Si 0.20%～0.50%,Mn 0.30%～0.60%,P 0.06%～0.10%,S≤0.015%,Cr 0.20%～0.50%,Ti 0.02%～0.08%, the balance of Fe and unavoidable impurities in mass fraction. Optionally, the method further comprises: And in the scheduling stage, the heating plan of the copper-containing corrosion-resistant steel slab is isolated from the plan of other steel types with tapping temperature more than or equal to 1260 ℃ or in-furnace time more than or equal to 200 min. Optionally, the isolation schedule is implemented by inserting an empty furnace time or a transition steel grade schedule with a tapping temperature of 1250 ℃ or less and an in-furnace time of 180min or less between the heating schedule and the two schedules of the other steel grade schedule. In a second aspect, an embodiment of the present application provides a hot-rolled corrosion-resistant steel sheet, which is produced by the method for controlling copper embrittlement defects of corrosion-resistant steel according to any one of the first aspects, wherein the surface copper embrittlement cracks of the hot-rolled corrosion-resistant steel sheet have a length of 5mm or less and a crack density of 1 strip/m 2 or less. Optionally, the Ni content in the chemical composition of the corrosion-resistant steel hot rolled plate is less than or equal to 0.05 percent. Optionally, the thickness of the corrosion-resistant steel hot rolled plate is 1.5 mm-6.0 mm, the yield strength is more than or equal to 345MPa, the tensile strength is more than or equal to 480MPa, and the elongation after fracture is more than or equal to 22%. In a third aspect, an embodiment of the present application provides a production system of a corrosion-resistant steel hot rolled sheet, including: the heating furnace is sequentially provided with a preheating section, a first heating section, a second heating section and a soaking section along the travelling direction of the plate blank; The temperature detection unit is arranged at the first heating section outlet, the second heating section outlet and the soaking section outlet; the combust