Rolling and preparation method of magnesium alloy sheet

Patent metadata

Field	Value
Publication number	US-11534806-B2
Application number	US-201615780476-A
Country	US
Kind code	B2
Filing date	Dec 6, 2016
Priority date	Dec 14, 2015
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

The present disclosure provides a high-efficient rolling process for magnesium alloy sheet. Parameters of the rolling process are: the rolling speed of each rolling pass is 10-50 m/min, the rolling reduction of each rolling pass is controlled to be 40-90%, and both the preheating temperature before rolling and the rolling temperature of each rolling pass are 250-450° C. The present disclosure also provides a preparation method for magnesium alloy sheet, comprising: 1) preparing rolling billets; 2) high-efficient hot rolling; and 3) performing annealing. The rolling process can improve the mechanical performance especially, the strength and ductility of the sheet.

First claim

The invention claimed is:

1. A rolling process for magnesium alloy sheets,
wherein billets are rolled in a rough rolling step and a high-efficiency hot rolling step, and wherein,
in the rough rolling step, a reduction of each pass is 10-30%, and a rolling speed of each pass is 10 m/min to 45 m/min, and
in the high-efficiency hot rolling step, a rolling speed in each rolling pass is 10-50 m/min, rolling reduction in each rolling pass is 40-90%, the billets are preheated 1-15 min before rolling in each rolling pass, and the temperature of the preheating before rolling and a temperature of rolling in each rolling pass are controlled to be 250-450° C.

2. A method for producing magnesium alloy sheets, comprising the following steps of:
1) preparing rolled magnesium alloy billets by a rough rolling, wherein a reduction of each pass is controlled to be 10-30% and a rolling speed of each pass is controlled to be 10 m/min to 45 m/min,
2) effectively hot-rolling the rolled magnesium alloy billets to at least a target level, wherein rolling speed in each rolling pass is 10-50 m/min, rolling reduction in each rolling pass is controlled to be 40-90%, and the rolled magnesium alloy billets are preheated 1-15 min before rolling in each rolling pass, and a temperature of the preheating before rolling and a temperature of rolling in each rolling pass are controlled to be 250-450° C., and
3) annealing at an annealing temperature of 150-400° C. and annealing time of 10-300 s.

3. The method according to claim 2 , wherein in the step 1), the step of preparing the rolled magnesium alloy billets comprises smelting and casting an ingot, homogenization treatment, sawing the ingot and rough rolling the ingot.

4. The method according to claim 3 , wherein in the step 1), the rolled magnesium alloy billets are preheated before each pass of rough rolling, and preheating temperature and rolling temperature in each pass of rough rolling are controlled to be 250-450° C.

5. The method according to claim 2 , wherein in the step 1), the step of preparing the rolled magnesium alloy billets is prepared by a twin-roll casting method.

Assignees

• Baoshan Iron & Steel

Inventors

• Xu Shiwei
• Tang Weineng
• Nie Jianfeng
• Bian Mingzhe
• Jiang Haomin
• Zhang Pijun

Classifications

• C21D8/02

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

• B21B3/00 Primary

  Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences {; Rolling of aluminium, copper, zinc or other non-ferrous metals}(altering special metallurgical properties of alloys, other than structure consolidation or mechanical properties resulting therefrom C21D, C22F) · CPC title

• B21B1/227

  Surface roughening or texturing · CPC title

• B21B1/22 Primary

  for rolling {plates, strips,} bands or sheets of indefinite length (B21B1/42 takes precedence) · CPC title

• C22F1/06

  of magnesium or alloys based thereon · CPC title