The yield point of high tensile steel is the stress level at which the material begins to deform plastically, or permanently, without any increase in load. It is an important factor in determining the strength and ductility of the steel.
Generally, as temperature increases, the yield point of high tensile steel decreases. This is because at higher temperatures, the material becomes more ductile and is able to withstand higher levels of stress before deforming plastically.
The relationship between yield point and temperature in high tensile steel is described by the yield point temperature coefficient, which is the rate at which the yield point decreases with increasing temperature. This coefficient varies depending on the specific composition and heat treatment of the steel.
Yes, the yield point of high tensile steel can be increased at high temperatures through a process called precipitation hardening. This involves heating the steel to a specific temperature and then rapidly cooling it, which creates a fine dispersion of particles that increase the strength of the material.
No, the yield point temperature coefficient varies depending on the specific composition and heat treatment of the steel. Different types of high tensile steel may have different coefficients, which can affect their performance at different temperatures.