Production method for thick Z-direction wind power steel

Abstract

The invention discloses a production method for thick Z-direction wind power steel, which comprises the following steps of: 1, firstly adjusting the formula of steelmaking components in percentage by weight: 0.14wt.% of C, 0.36wt.% of Si, 1.30wt.% of Mn, 0.014wt.% of P, 0.007wt.% of S, 0.016wt.% of V, 0.018wt.% of Nb, 0.033wt.% of Als, 0.022wt.% of Ti, 0.002wt.% of Ca and the balance iron and impurities; and 2, after a qualified blank with the thickness being 250 mm, the width being 1800 mm and the length being 3.8 m is smelted through steelmaking according to the alloy element design requirement, performing primary rolling on the blank to be an intermediate blank with the thickness being 110 mm through a roughing mill, and then rolling the intermediate blank into a finished wind power steel plate with the thickness being 50 mm through a finishing mill. The method mainly controls the contents of sulfur and phosphorus in the components, designs a medium plate rolling process, in the step 3, normalizing treatment is conducted at the temperature of 900 DEG C for 1.6 hours in a furnace, discharged steel plates are subjected to stacking, preserving heat and slowly cooling at the temperature of 400 DEG C for 36 hours through a slow cooling box, hydrogen in the steel can be discharged outwards in a diffusion manner, and therefore, the mechanical property is further optimized.

Description

Technical field [0001] The present invention relates to a production method of thick specification Z to wind electric steel. Background technique [0002] During the rolling process, as the plate thickness increases, the thickness direction compression ratio is reduced, and the mechanical properties of the steel sheet in three directions are different: the performance in the rolling direction is preferably, it is slightly poor in the direction of the rolling direction. Time along the thickness direction. For thick steel plates, local hierarchical phenomena is often difficult to avoid. The layering is mainly defective from sulfur, phosphorus segregation and non-metallic inclusion in steel, which will affect the mechanical properties of steel. According to the national standard, the steel sheet is X, Y, and the width is Z-direction in the direction of the rolling length and the width, respectively. With the improvement of structural steel technical requirements, the thicker the ste...

AI Technical Summary

Problems solved by technology

In the T-joint during the welding process, the steel plate bears a large Z-direction tensile stress. If the steel plate has poor lamellar tear resistance, lamellar tearing may occur in these parts, causing serious accidents

However, from smelting to rolling of Z-direction steel, different iron and steel factories have their own different composition formulations and rolling processes. After analyzing relevant data, it is found that the use of alloy elements in Z-direction steel is generally high, resulting in high production costs. User costs also increase accordingly

Images