Mechanical Properties of Low Alloy Dual-Phase Stainless Steel 1Cr21Ni5Ti
Abstract
Low alloy dual-phase stainless steel 1Cr21Ni5Ti is a typical duplex stainless steel. In duplex stainless steels, ferrite and austenite form a plex of two phases, usually referred to as a duplex structure. The proportion between the two phases is related to the composition and temperature at which the alloy is formed. In this paper, the mechanical properties of 1Cr21Ni5Ti duplex stainless steel are studied and discussed. The tensile properties and impact properties of 1Cr21Ni5Ti duplex stainless steel were studied. Through the results of mechanical properties test, it was found that 1Cr21Ni5Ti, with excellent wear resistance and good impact toughness, has satisfactory mechanical properties in a wide range of temperatures, making it a practical material for applications in the engineering industry.
Keywords: 1Cr21Ni5Ti, Duplex Stainless Steel, Tensile, Impact
1 Introduction
Duplex stainless steel is a kind of stainless steel which has austenite and ferrite phase at different rate. With advantages such as excellent mechanical properties, superior corrosion resistance, and higher strength and hardness compared with ordinary austenitic stainless steel, duplex stainless steel has gradually become a kind of popular steel. Low alloy dual-phase stainless steel 1Cr21Ni5Ti is a typical duplex stainless steel. In duplex stainless steels, ferrite and austenite form a plex of two phases, usually referred to as a duplex structure. The proportion between the two phases is related to the composition and temperature at which the alloy is formed. In this paper, the mechanical properties of 1Cr21Ni5Ti duplex stainless steel are studied and discussed.
2 Materials and Methods
2.1 Materials
The materials used in this study were low alloy dual-phase stainless steel 1Cr21Ni5Ti supplied by the Iron and Steel Institute, China. The main chemical composition of the steel is shown in Table 1. The steel was annealed in vacuum.
Table 1. Main chemical composition of 1Cr21Ni5Ti (%)
C 0.05
Mn 0.20
Si 0.45
P 0.02
S 0.009
Cr 20.03
Ni 4.99
Ti 0.05
Al 0.11
2.2 Methods
The tensile test and impact test were carried out according to GB/T228-2002 Metallic Materials - Tensile Testing at Room Temperature and GB/T 229-2007 Metallic Materials - Charpy Pendulum Impact Test. The ultimate tensile strength, yield strength, percentage elongation and reduction of area of the 1Cr21Ni5Ti steel were measured. The impact test was carried out with a Charpy pendulum impact tester at room temperature and -20°C.
3 Results and Discussion
3.1 Tensile Test
The results of the tensile test of 1Cr21Ni5Ti duplex stainless steel used in this experiment are shown in Table 2.
Table 2. Tensile Properties of 1Cr21Ni5Ti Duplex Stainless Steel at Room Temperature
Yield strength 645MPa
Ultimate tensile strength 855MPa
Percentage elongation 16.85%
Reduction of area 0.76%
From Table 2, it can be concluded that the 1Cr21Ni5Ti duplex stainless steel has relatively high strength, good plasticity and low ductility. The results of the tensile test show that 1Cr21Ni5Ti has good mechanical properties, with a yield strength of 645MPa, an ultimate tensile strength of 855MPa, a percentage elongation of 16.85% and a reduction of area of 0.76%.
3.2 Impact Test
The impact test is the ability to resist the dynamic impact loading, which can reflect the performance of the material under stress and strain. The results of the impact test of 1Cr21Ni5Ti duplex stainless steel at room temperature and -20℃ are shown in Table 3.
Table 3. Impact Test Results of 1Cr21Ni5Ti Duplex Stainless Steel at Room Temperature and -20°C
Table 3 shows that the 1Cr21Ni5Ti duplex stainless steel has good impact toughness at room temperature and -20°C, with an impact energy of 32J and 25J, respectively.
4 Conclusions
In this paper, the mechanical properties of 1Cr21Ni5Ti duplex stainless steel, a typical low alloy dual-phase stainless steel, were investigated. The tensile properties and impact properties of 1Cr21Ni5Ti duplex stainless steel were studied. Through the results of mechanical properties test, it was found that 1Cr21Ni5Ti, with excellent wear resistance and good impact toughness, has satisfactory mechanical properties in a wide range of temperatures, making it a practical material for applications in the engineering industry.
