The present application provides an extra-thick Q500qE bridge steel plate and a production method therefor. The production method involves direct rolling of the slab after three-stage heating before rolling and three-stage cooling of the steel plate after rolling. This method can produce a Q500qE steel plate with a maximum thickness of 150 mm, which meets the Z35 level Z-direction tensile performance requirements and the nondestructive testing requirements of Grade II or above according to GB/T 2970-2016 standard. The production process is simple, efficient, and cost-effective.

A method for producing a sheet metal or strip and a sheet metal or strip produced using this method are described. For a comparatively high gloss level and a comparatively high durability, it is proposed for the sheet metal or strip made of an aluminum alloy of the EN AW-5xxx type to have a cold-rolled structure having a grain structure that is elongated in the rolling direction, with grains whose grain aspect ratio AI.sub.l=l.sub.l(0)/l.sub.l(90) is 10, more particularly 15, measured according to ASTM E112-13.

Disclosed is a skew rolling assembly suitable for large-size superalloy bars, including four rollers with completely identical shape and size, where the four rollers are all active rollers. In the production process, the four rollers play a role in promoting the forward flow of blank metal in a rolling direction, thus avoiding a rolling jamming phenomenon caused by the obstruction of guide plates to the forward flow of the blank in the rolling process of the prior art. The providing of the four rollers improves the rolling speed and increases the degree of deformation. Disclosed is a skew rolling method suitable for large-size superalloy bars. By utilizing the skew rolling assembly suitable for the large-size superalloy bars, and utilizing four rotating active rollers for the skew-rolling forming of bars, the rolling speed is improved, the problem that the cooperative rolling of two rollers and guide plates in the prior art is prone to the phenomenon of rolling jamming is avoided, the forming quality is guaranteed, the rolling production efficiency is improved, and the degree of deformation is increased.

The present invention provides a modeling and manufacturing method for a reversible plow point with the characteristics of a low resistance and being strong inside and hard outside. By means of performing parameter optimization, three-dimensional modeling and numerical simulation analysis on a curved surface of a plough point, parameters, i.e. a plowshare angle .sub.0, a plowshare surface angle , an included angle between a soil trace and a plowshare edge, and a soil lifting angle , at which the lowest working resistance is achieved, are determined, and composition optimization design and die forging-machining-carburization-quenching-tempering treatment are performed on a base material of the plough point, such that a new reversible plow point with the characteristics of a low operation resistance, high strength toughness of a core portion, and high wear resistance of a surface layer is obtained. The present invention can effectively solve the problems of wear, failure and resistance increase which easily occur due to a plough point being subjected to high-speed impact and wear from soil, sand, stones and root blocks for a long period of time during a service process, and the present invention is expected to be widely applied to the field of manufacturing of soil contact components of agricultural machinery.