YP100MPa steel plate and manufacture method thereof

Abstract

The invention relates to a YP100MPa steel plate and a manufacture method thereof. According to the method, a rolling process is optimized by adopting the metallurgy technical approaches of using an extreme low C-extreme low Si-extreme low Mn-high Als-low N-(Nb+Ti) microalloying-B treatment component system, properly improving the content of acid insoluble Als, microalloying (Ti+Nb), controlling Ti / Nb to be of between 0.50 and 1.00, controlling Ti / N to be larger than or equal to 8.0, Als / N to be larger than or equal to 10, (0.13Nb+0.25Ti) to be larger than or equal to 1.05C and (P+S) / B to be less than or equal to 95, and the like; the microscopic structure of the finished steel plate is single-phase ferrite, the grain size of the ferrite is uniform, and the average grain size is between 50microns and 100 microns; solid soluble C and N interstitial atoms in steel are eliminated, titanium / niobium carbonitride particles and AlN particles are thick and are uniformly distributed, and the ferrite grain boundary is strengthened by microB treatment; and by means of the manufacture method, the YP100MPA obtains extreme low yield strength (YP:80-120MPa), favorable room temperature plastic deformation capability (uniform elongation reaches more than 55 percent), low cycle fatigue resistance and low processing hardening rate and is particularly suitable for being used as a quake-proof damper of a large steel structure.

Description

technical field [0001] The present invention relates to the manufacture of low yield point steel plate, especially YP100MPa steel plate and its manufacturing method, which is based on extremely low C-extremely low Si-extremely low Mn-high Als-low N-(Nb+Ti) microalloying-B Yield strength 80-120MPa, elongation δ are obtained in the processed component system 5 ≥55%, very low yield point steel plate with excellent low temperature impact toughness and resistance to cyclic strain hardening. Background technique [0002] As we all know, carbon structural steel is one of the most important engineering structural materials, widely used in shipbuilding, bridge structure, pressure vessel, building structure, automobile industry, railway transportation and machinery manufacturing. The performance of carbon structural steel depends on its chemical composition and the process system of the manufacturing process. Among them, strength, toughness, elongation and weldability are the most im...

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Problems solved by technology

[0006] The purpose of the present invention is to design the YP100MPa steel plate and its manufacturing method. By combining the combination design of the microalloy elements of the steel plate and the controlled rolling process, the steel plate has an extremely low yield point and excellent room temperature cyclic deformation ability, and the steel plate also has excellent Low-temperature impact toughness, and successfully solved the problems of discontinuous yielding and low-cycle fatigue resistance of carbon structural steel

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