A859/A859M-04(2014) is a standard specification for pressure vessel plates, alloy steel, 5% and 5 1/2% nickel alloy steels. This specification covers requirements for low-carbon nickel alloy steel plates for use in pressure vessels.
The chemical composition of A859/A859M-04(2014) steel grade includes a maximum carbon content of 0.22%, manganese content ranging from 0.70 to 1.60%, phosphorus content of 0.025%, sulfur content of 0.010%, silicon content ranging from 0.10 to 0.35%, nickel content ranging from 5.00 to 5.50%, chromium content ranging from 0.40 to 0.70%, molybdenum content ranging from 0.05 to 0.15%, and vanadium content ranging from 0.03 to 0.08%. The steel is also required to undergo heat analysis and product analysis to ensure its chemical composition meets the specified requirements.
The mechanical properties of A859/A859M-04(2014) steel grade are also important. It has a minimum tensile strength of 75 ksi (515 MPa) and a minimum yield strength of 50 ksi (345 MPa). The steel undergoes various tests such as tension tests, Charpy V-notch impact tests, and notch toughness tests to determine its mechanical properties.
The importance of A859/A859M-04(2014) steel grade lies in its application in pressure vessels. This steel grade is specifically designed for use in low-temperature service, where high toughness and notch toughness properties are required. It is commonly used in industries such as oil and gas, chemical processing, and power generation, where pressure vessels are exposed to harsh operating conditions and low temperatures.
In summary, A859/A859M-04(2014) steel grade is a low-carbon nickel alloy steel that offers high toughness and notch toughness properties. Its chemical composition and mechanical properties make it suitable for use in pressure vessels operating under low-temperature conditions. This steel grade is widely used in industries that require reliable and durable pressure vessels.