High-temperature-resistant ferritic stainless steel for cold heading fastener nut and production process thereof

Abstract

The invention provides high-temperature-resistant ferritic stainless steel for a cold heading fastener nut and a production process thereof. The high-temperature-resistant ferritic stainless steel iscomposed of the following components including, by weight, larger than 0 and smaller than or equal to 0.06% of C, larger than 0 and smaller than or equal to 1.0% of Mn, larger than 0 and smaller thanor equal to 1.0% of Si, larger than 0 and smaller than or equal to 0.045% of P, larger than 0 and smaller than or equal to 0.04% of S, 10.5%-11.75% of Cr, larger than 0 and smaller than or equal to 0.5% of Ni, 0.25%-0.75% of Nb and 84.89%-86.61% of Fe. According to the high-temperature-resistant ferritic stainless steel, a product cannot deform and can be used for cold heading materials through heat treatment hardening under continuous working of a 500 DEG C high temperature area, and the high plasticity index, elongation and the area reduction rate are achieved. During cold plastic deformation, the deformation resistance of the materials is small, the work hardening rate is low, and the yield ratio of the materials is small, and the hardness is appropriate.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a high-temperature-resistant ferritic stainless steel for cold heading fastener nuts and a production process thereof. Background technique [0002] The cold heading process is one of the few new processes for non-cutting metal pressure processing. It is a processing method that uses the plastic deformation of metal under the action of external force, and with the help of molds, redistributes and transfers the metal volume to form the required parts or blanks. The cold heading process is most suitable for the production of standard fasteners such as bolts, screws, nuts, rivets, and pins. [0003] High-temperature-resistant ferrite materials need materials that will not deform and can be used for cold extrusion under continuous operation in the high-temperature region of 700 °C. [0004] At present, similar materials in China have high surface strengt...

AI Technical Summary

Problems solved by technology

However, the stainless steel provided by this patent has a Ni content as high as 11.00-13.00wt%, and continuous operation in the high temperature region of 600°C will affect the processing effect