Method for producing stainless steel-carbon steel extremely-thick heterogeneous composite plate

Abstract

The invention provides a method for producing a stainless steel-carbon steel extremely-thick heterogeneous composite plate. The method includes the steps that a multilayer stainless steel plate I is put into a caulking groove of a base layer carbon steel plate I, the surface, coated with a parting agent, of a multilayer stainless steel plate II is put onto the multilayer stainless steel plate I, and a base layer carbon steel plate II is stacked onto the multilayer stainless steel plate II and then fed into a vacuum chamber for vacuum pumping until the air pressure is smaller than or equal to 3*10<4>torr; after vacuum pumping is completed, spot welding is conducted along the four edges located between the base layer carbon steel plate I and the base layer carbon steel plate II, and continuous welding using a small current at first and then using a normal current is carried out; and heating is performed in a heating furnace to 500 DEG C after welding, the plates are rolled into a composite plate blank and then are subjected to hot rolling into the heterogeneous composite plate, carbon steel parts on the edge are removed, and then the two stainless steel plates are separated from the middle of the part coated with the parting agent. By the adoption of the method, a welding blank can be manufactured at a time, the processing cycle is shortened, production cost is reduced, bubbles generated in the later-period heating process are avoided, product quality is guaranteed, the rate of composite plate finished products is increased, and the produced heterogeneous composite plate meets the standard requirement of GB / T8165-2008.

Description

technical field [0001] The invention belongs to the technical field of composite plate production technology, and in particular relates to a method for producing a heterogeneous composite plate by compounding a 200-260 mm back-base carbon steel plate and a 20-35 mm thick clad stainless steel plate. Background technique [0002] Stainless steel composite plate is a composite steel plate made of carbon steel base layer and stainless steel clad layer. Its main feature is that carbon steel and stainless steel form a firm metallurgical bond. It is a material that has both the advantages of stainless steel and carbon steel. It has been Widely used in petroleum, chemical industry, salt industry, water conservancy, electric power and other industries. As a resource-saving product, it can greatly reduce the construction cost, realize the perfect combination of low cost and high performance, and have good economic and social benefits. [0003] At present, the production methods of st...

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Problems solved by technology

[0004] However, in the process of hot rolling the combined billet by the current vacuum rolling method, there is gas in the composite interface, which leads to a certain degree of oxidation at the composite interface, and the vacuum cannot generate an absolute vacuum, and residual gas remains between the composite interface and the two-layer stainless steel interface. There is a very small amount of gas, which expands in the hot rolling state and cannot be discharged, which seriously affects the bonding rate and bonding strength of the composite interface, resulting in a low yield of composite panels