Rolling method of dual-phase stainless steel hot continuous rolled coil

Abstract

The invention relates to a rolling method of a dual-phase stainless steel hot continuous rolled coil, which comprises the following steps: I, grinding a casting blank, i.e. grinding the outer surfaceof the casting blank without macroscopic defects on the surface after the grinding; II, heating, i.e. heating with hot furnace temperature of 1200-1280 DEG C and furnace halting time of 180mm thick casting blank of 220-260min and 200 thick casting blank of 240-280min; III, rough rolling, i.e. placing the casting blank with the temperature is 1100-1150 DEG C before the rolling into a reversible type rolling mill to be rolled into a plate blank finished product with the thickness of 34-40mm; IV, finish rolling, i.e. placing the plate blank to a finishing mill group to be rolled with final rolling temperature higher than or equal to 950 DEG C into a coil finished product with the thickness of 4-12mm; V, rolling, i.e. placing the coil into a laminar flow to be cooled after the finish rolling,and ensuring rolling temperature to be 750-800 DEG C; VI, performing heat treatment on the coil, i.e. placing the coil into a continuous type heating furnace to be subjected to the heat treatment withheat treatment plate temperature of 1020-1100 DEG C, and water-cooling the coil after the coil is taken out of the continuous type heating furnace, wherein the temperature of the coil is generally lower than or equal to 100 DEG C after the coil is cooled; and VII, acid-washing the coil. The rolling method of the dual-phase stainless steel hot continuous rolled coil prevents the detects of the edge cracking, the decoiling and the fracture of the hot continuous rolled coil.

Description

technical field [0001] The invention relates to a rolling method of duplex stainless steel hot continuous rolling coils, in particular to a rolling method of S31803 duplex stainless steel hot continuous rolling coils. Background technique [0002] In S31803 duplex stainless steel, austenite and ferrite coexist in the room temperature structure, and the general ratio is close to 1:1. This type of steel has high strength (its yield strength is generally twice that of austenitic stainless steel), good resistance Cl - It has outstanding advantages such as pitting corrosion resistance, stress corrosion resistance and welding performance, and is widely used in petrochemical, salt production, hydraulic engineering, shipbuilding, civil and other fields. Compared with ordinary austenitic stainless steel and super austenitic stainless steel, the content of Ni in the steel is significantly reduced, and the manufacturing cost is reduced. It is a resource-saving steel type. [0003] At...

AI Technical Summary

Problems solved by technology

However, if the general hot continuous rolling process is used for production, it is easy to produce defects such as coil edge cracking and uncoiling breakage, and the pass rate is very low.