Physical properties of 2507 duplex stainless steel at high temperature
ZHOU Shi-kai
HU Zhong
ZENG Jing
LÜ Ming
TIAN Chuan
WANG Rong
Abstract：In this paper,to control the defects such as surface depression and crack of continuous casting billet of 2507 duplex stainless steel,through comprehensive thermal analyzer,thermal expansion analyzer,laser ther-mal conductivity tester and thermal/mechanical simulation testing machine respectively,2507 duplex stainless steel were have done the comprehensive thermal analysis test,thermal expansion test,laser thermal conductivity test and high-temperature mechanical test were done.The results show that the solidus temperature of 2507 duplex stainless steel is 1 469.5℃,and the liquidus temperature is 1 446.2℃.When the temperature is between 100℃ and 750℃,the average linear expansion coefficient of 2507 stainless steel is 16.606 1×10-6 K-1,between 750℃ and 1 020℃ is 14.916 2×10-6 K-1,and between 1 020℃ and 1 400℃ is 20.475 1×10-6 K-1.During the cooling process,the average linear expansion coefficient is-22.690 3×10-6 K-1,the density of 2507 stainless steel decreases with the increase of temperature.The thermal diffusivity of 2507 stainless steel increases by 25％when the temperature increases from 650℃ to 1 150℃.The thermal conductivity increases with the increase of temperature,and it reaches the maximum value of 34 W/(m·K)at 1 000℃.When the temperature exceeds 1 200℃,the tensile strength is less than 20 MPa.When the temperature is 1 000～1 200℃,the reduction of area of the samples is more than 60％,and the plasticity is good,which belongs to the high-temperature plastic zone.
Keywords：duplex stainless steellinear expansion coefficientthermal expansionthermal conductivityhigh temperature properties
Publication Date：2023-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 48-53 )