Multi-layer rolled composite board and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-2022410533-A1
Application number	US-202017780124-A
Country	US
Kind code	A1
Filing date	Nov 25, 2020
Priority date	Nov 27, 2019
Publication date	Dec 29, 2022
Grant date	—

Abstract

Disclosed is a multi-layer rolled composite board, comprising a transition layer provided between two adjacent composite layers, wherein the transition layer is an anisotropic steel sheet. Also disclosed is a manufacturing method for the multi-layer rolled composite board, the method comprising the following steps: (1) providing a transition layer between adjacent composite layers to assemble a blank, and creating a vacuum between the layers; and (2) performing composite rolling, comprising: heating the blank to 1100-1260° C. and maintaining the temperature for 0.6 h or above, then performing hot rolling at a temperature of Ar3 or above, with the final rolling temperature being controlled to be higher than 820° C., cooling at a speed of 30-100° C./s after rolling, and then coiling, with the coiling temperature being controlled to be 20-750° C. The multi-layer rolled composite board of the present invention can be greatly transformed according to different compositions and processes so as to achieve different strength grades ranging from 150 MPa to 1700 MPa, thereby providing the basis for different specific mechanical properties for the whole steel sheet.

First claim

1 . A multilayer rolled clad plate, characterized in that it comprises a transition layer between two adjacent cladding layers, wherein the transition layer is an anisotropic thin steel plate.

2 . The multilayer rolled clad plate according to claim 1 , wherein the anisotropic thin steel plate is a cold rolled steel plate or a hot rolled acid-pickled steel plate.

3 . The multilayer rolled clad plate according to claim 1 , wherein the anisotropic thin steel plate has an orientation degree that satisfies: 1.25≥AI≥1.05 before assembling a blank.

4 . The multilayer rolled clad plate according to claim 1 , wherein the transition layer comprises one or more layers.

5 . The multilayer rolled clad plate according to claim 1 , wherein the thickness of each layer of the anisotropic thin steel plate is less than 5% of the total thickness of the multilayer rolled clad plate.

6 . The multilayer rolled clad plate according to claim 1 , wherein the multilayer rolled clad plate comprises a substrate layer, a transition layer located on one or both sides of the substrate layer, and a cladding material layer located on the outside of the transition layer, wherein the thickness of the substrate layer is 0.5-4.0 mm and the thickness of each cladding material layer is in the range of 0.05-0.4 mm.

7 . The multilayer rolled clad plate according to claim 1 , wherein the multilayer rolled clad plate has a metallic or non-metallic plating layer on at least one surface.

8 . The multilayer rolled clad plate according to claim 1 , wherein the anisotropic thin steel plate comprises the following chemical elements in weight percentages: C: 0.01-0.10%; Si: 0.01-0.5%; Mn: 0.5-2.5%; Al: 0.01-0.06%; Ti≤0.06%; Cr≤0.50%; Mo≤0.30%; and a balance of Fe and unavoidable impurities.

9 . The multilayer rolled clad plate according to claim 1 , wherein the anisotropic thin steel plate comprises a substrate layer, a transition layer and a cladding material layer, wherein the C content of the transition layer is between that of the substrate layer and the cladding material layer.

10 . A manufacturing method for the multilayer rolled clad plate according to claim 1 , wherein the manufacturing method comprises the following steps:
(1) providing a transition layer between adjacent cladding layers for assembling a blank, and vacuumizing between layers; (2) clad rolling: wherein the blank is heated to 1100-1260° C. and held for 0.5 hours or more, then hot-rolled at a temperature of Ar3 or more, wherein a final rolling temperature is controlled to be greater than 820° C., and after rolling, the blank is cooled at a rate of 30-100° C./s, and then coiled, and wherein the coiling temperature is controlled to be 20-750° C.

11 . The manufacturing method according to claim 10 , wherein the method further comprises Step (3) of cold rolling.

12 . The manufacturing method according to claim 11 , wherein the method further comprises Step (4) of annealing: wherein the plate is soaked at a soaking temperature of 700-880° C., and then cooled at a rate of 3-20° C./s to a rapid cooling starting temperature of 600-780° C., and then cooled at a rate of 20-1000° C./s to 150-550° C.

13 . The manufacturing method according to claim 12 , wherein the method further comprises Step (5) of tempering: wherein a tempering temperature is 150-550° C., and a tempering time is 100 s-400 s.

14 . The manufacturing method according to claim 10 , wherein the method further comprises a step of leveling.

15 . The multilayer rolled clad plate according to claim 1 , wherein the thickness of each layer of the anisotropic thin steel plate is 0.5 to 10.0 mm.

16 . The manufacturing method according to claim 10 , wherein the anisotropic thin steel plate is a cold rolled steel plate or a hot rolled acid-pickled steel plate.

17 . The manufacturing method according to claim 10 , wherein
the anisotropic thin steel plate has an orientation degree that satisfies: 1.25≥Al≥1.05 before assembling a blank; or the thickness of each layer of the anisotropic thin steel plate is less than 5% of the total thickness of the multilayer rolled clad plate; or the anisotropic thin steel plate comprises the following chemical elements in weight percentages: C: 0.01-0.10%; Si: 0.01-0.5%; Mn: 0.5-2.5%; Al: 0.01-0.06%; Ti≤0.06%; Cr≤0.50%; Mo≤0.30%; and a balance of Fe and unavoidable impurities; or the anisotropic thin steel plate comprises a substrate layer, a transition layer and a cladding material layer, wherein the C content of the transition layer is between that of the substrate layer and the cladding material layer.

18 . The manufacturing method according to claim 10 , wherein the transition layer comprises one or more layers.

19 . The manufacturing method according to claim 10 , wherein
the multilayer rolled clad plate comprises a substrate layer, a transition layer located on one or both sides of the substrate layer, and a cladding material layer located on the outside of the transition layer, wherein the thickness of the substrate layer is 0.5-4.0 mm and the thickness of each cladding material layer is in the range of 0.05-0.4 mm; or the multilayer rolled clad plate has a metallic or non-metallic plating layer on at least one surface.

20 . The manufacturing method according to claim 10 , wherein the thickness of each layer of the anisotropic thin steel plate is 1 to 3 mm.

Assignees

• Baoshan Iron & Steel

Inventors

• Xue Peng
• Zhu Xiaodong
• Yan Bo
• Jiao Sihai

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C21D2211/008

  Martensite · CPC title

• C21D8/0247

  characterised by the heat treatment · CPC title

• C22C38/38

  with more than 1.5% by weight of manganese · CPC title

• B32B37/1018

  using only vacuum · CPC title