What are the differences in physical properties between 0Cr18Ni9 and 1Cr18Ni9?
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This post was last edited by A Dai A Mu on 2012-1-9 at 20:08. The chemical properties of 0Cr18Ni9 and 1Cr18Ni9 differ mainly in their carbon content; the carbon content in 1Cr18Ni9 is around 0.1%. What are the differences in their physical properties? In what occasions are they applicable respectively? This post was last edited by GUANGWEI8.26 on 2009-2-26 08:57.]
The difference in carbon content between 0Cr18Ni9 and 1Cr18Ni9 results in a certain difference in their corrosion resistance; furthermore, 1Cr18Ni9 has lower yield strength and elongation after fracture compared to 0Cr18Ni9. There should be no strict boundary between the two in terms of usage; it’s just that 0Cr18Ni9 requires more thorough decarburization during manufacturing, which results in higher costs.
The difference in carbon content between 0Cr18Ni9 and 1Cr18Ni9 results in differences in their corrosion resistance; the carbon content contributes to intergranular corrosion
Differences in physical properties between 0Cr18Ni9 and 1Cr18Ni9: Both 0Cr18Ni9 and 1Cr18Ni9 belong to low-carbon alloy steels; the carbon content in 0Cr18Ni9 is 0.07%, while that in 1Cr18Ni9 is 0.15%. The heat treatment method used for both austenitic steels is solution treatment, and their mechanical properties after heat treatment are the same. During the use of steel, their corrosion resistance varies due to differences in carbon content.
1Cr18Ni9 is a product that is being phased out, gradually being replaced by 0Cr18Ni9.
The main difference should be the toughness of the material, also known as its ductility.
1Cr18Ni9 has a higher carbon content, which gives it better high-temperature mechanical properties compared to 0Cr18Ni9; however, its weldability is inferior to that of 0Cr18Ni9, and this is the main reason why it is used as a substitute for 0Cr18Ni9.
Both 0Cr18Ni9 and 1Cr18Ni9 belong to low-carbon alloy steels; 0Cr18Ni9 has a lower carbon content than 1Cr18Ni9, which is why its mechanical properties are superior to those of 1Cr18Ni9. These days, in the design of many pressure vessels, if stainless steel is required, 0Cr18Ni9 is used. Used more often
0Cr18Ni9 steel belongs to the austenitic stainless acid-resistant steel; due to its low carbon content, it possesses good formability and oxidation resistance； It has strong corrosion resistance to oxidizing acids, and it also exhibits a certain degree of corrosion resistance to alkaline solutions as well as most organic and inorganic acids. The lower carbon content results in better intergranular corrosion resistance compared to 1Cr18Ni9 with a higher carbon content; however, it still exhibits a tendency to suffer from intergranular corrosion when operating in water and steam over long periods of time. 1Cr18Ni9 steel is one of the simpler austenitic stainless steels; it is equivalent to 12X18H9 in the former Soviet Union, 302 in the United States, and SUS302 in Japan. It has a high yield strength after cold working, but its elongation is slightly lower than that of 0Cr18Ni9. This steel exhibits good corrosion resistance, cold workability, and weldability, yet its resistance to intergranular corrosion is inferior to that of 0Cr18Ni9. Furthermore, 1Cr18Ni9 steel cannot be strengthened by heat treatment; after sensitization at 650°C or prolonged exposure to medium temperatures, it becomes susceptible to intergranular corrosion ； Although its weldability is good, it is inferior to 0Cr18Ni9.
Refer to GB4237-1992