High-temperature and low-temperature resisting ferrite material for cold heading bolt and production technology of high-temperature and low-temperature resisting ferrite material

Abstract

The invention provides a high-temperature and low-temperature resisting ferrite material for a cold heading bolt and a production technology of the high-temperature and low-temperature resisting ferrite material. The high-temperature and low-temperature resisting ferrite material comprises following components including, by mass percent, 0.17 wt%-0.25 wt% of C, 0.40 wt%-0.80 wt% of Mn, larger than0 and smaller than or equal to 0.4 wt% of Si, larger than 0 and smaller than or equal to 0.025 wt% of P, larger than 0 and smaller than or equal to 0.025 wt% of S, 1.20 wt%-1.50 wt% of Cr, larger than 0 and smaller than or equal to 0.60 wt% of Ni, 0.55 wt%-0.80 wt% of Mo, larger than 0 and smaller than or equal to 0.030 wt% of Al, larger than 0 and smaller than or equal to 0.030 wt% of V and thebalance Fe and inevitable impurities. The ferrite material has high plasticity indexes, elongation rate and percentage reduction of area, during cold plastic deformation, the material deformation resistance is small, the machining hardening rate is low, the material yield ratio is low, and hardness is proper.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a high and low temperature resistant ferrite material for cold heading bolts and a production process thereof. Background technique [0002] Ferritic stainless steel is favored by researchers and the industry because of its good formability, excellent stress corrosion resistance and high temperature oxidation resistance, and low cost; and ferritic stainless steel has a suitable thermal conductivity and thermal expansion coefficient. Suitable for heat exchange and heat cycle occasions. [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 strength, non-metallic inclusions, surface defects, and poor decarburization conditions. In order to remove surfa...

AI Technical Summary

Problems solved by technology

However, the high temperature resistant ferritic stainless steel and its manufacturing method provided by this patent still have the risk of fracture during subsequent processing