High temperature oxidation-resistant coated steel plate and hot stamping method thereof

Abstract

A high temperature oxidation-resistant coated steel plate includes a steel base material and a high temperature oxidation-resistant coating. The high temperature oxidation-resistant coating is formed by coating a high temperature oxidation-resistant paint onto the steel base material and baking in an oven. The high temperature oxidation-resistant paint includes a binder and a plurality of micron aluminum flakes. The binder has a three-dimensional molecular structure of Al—O. The micron aluminum flakes has a micron-sized thickness and a length ranging from 5 to 30 μm inclusive. The disclosure can enhance high temperature oxidation-resistant ability and hot stamping characteristics of the coated steel plate, and makes objects after hot stamping have good spot weldability and coating performance.

What is claimed is: 
     
         1 . A high temperature oxidation-resistant coated steel plate, comprising:
 a steel base material; and   a high temperature oxidation-resistant coating formed by coating a high temperature oxidation-resistant paint onto the steel base material and baking in an oven, wherein the high temperature oxidation-resistant paint comprises a binder and a plurality of micron aluminum flakes, the binder has a three-dimensional molecular structure of Al—O, and the micron aluminum flakes has a micron-sized thickness and a length ranging from 5 to 30 μm inclusive.   
     
     
         2 . The high temperature oxidation-resistant coated steel plate of  claim 1 , wherein the steel base material is a manganese-boron steel base material. 
     
     
         3 . The high temperature oxidation-resistant coated steel plate of  claim 1 , wherein the thickness of the high temperature oxidation-resistant coating is between 2 and 10 μm inclusive. 
     
     
         4 . The high temperature oxidation-resistant coated steel plate of  claim 1 , wherein the weight of the micron aluminum flakes is 5-30% of the total weight of the paint. 
     
     
         5 . The high temperature oxidation-resistant coated steel plate of  claim 1 , wherein the binder is made with a sol-gel method. 
     
     
         6 . The high temperature oxidation-resistant coated steel plate of  claim 1 , wherein the coating method of the high temperature oxidation-resistant paint is selected from one of the following: spraying, roller coating and dip coating. 
     
     
         7 . The high temperature oxidation-resistant coated steel plate of  claim 1 , wherein the baking temperature of the high temperature oxidation-resistant coating is between 120 and 300° C. inclusive. 
     
     
         8 . The high temperature oxidation-resistant coated steel plate of  claim 1 , wherein the baking time of the high temperature oxidation-resistant coating is between 36 and 90 seconds inclusive. 
     
     
         9 . A hot stamping method of the high temperature oxidation-resistant coated steel plate, comprising:
 (a) providing the high temperature oxidation-resistant coated steel plate as claimed in  claim 1 ;   (b) heating the high temperature oxidation-resistant coated steel plate to an austenitizing state; and   (c) transferring the high temperature oxidation-resistant coated steel plate to a mold for hot stamping, to form an object.   
     
     
         10 . The hot stamping method of  claim 9 , wherein a tensile strength of the high temperature oxidation-resistant coated steel plate of the step (a) is 500 to 600 MPa inclusive. 
     
     
         11 . The hot stamping method of  claim 9 , wherein the heating temperature of the step (b) is 870 to 950° C. inclusive. 
     
     
         12 . The hot stamping method of  claim 9 , wherein the heating time of the step (b) is 3 to 5 minutes inclusive. 
     
     
         13 . The hot stamping method of  claim 9 , wherein the step (c) further comprises performing pressure holding and quenching treatment on the object at a cooling rate greater than 27° C. Is, so as to make the object to have a uniform martensite organization. 
     
     
         14 . The hot stamping method of  claim 13 , wherein a tensile strength of the object is greater than 1400 MPa.