JIS G 4109-1987 Chromium molybdenum steel for boilers and pressure vessels

JIS G 4109-1987 Chromium-Molybdenum Steel for Boilers and Pressure Vessels

This standard, JIS G 4109-1987, applies to chromium-molybdenum steel for boilers and pressure vessels. The standard specifies materials, mechanical properties, chemical composition, and other requirements for the manufacture of this steel type.

Chromium-molybdenum steel is used in applications that involve extreme temperatures, such as high pressure and corrosive environments. The steel is corrosion-resistant due to the chromium content and its ability to form a protective oxide layer on the surface. The molybdenum content increases the strength of the material and its ability to resist fatigue and heat-resistance.

The range of chromium-molybdenum steel covered by this standard covers materials for S1, S2, S3, and S4 grades, in addition to SB and SS grades. For each grade, the standard includes requirements for the maximum carbon content, manganese content, sulfur content, phophorus content, silicon content, chromium content, molybdenum content, copper content, niobium content, nickel content, vanadium content, titanium content, aluminum content, and nitrogen content.

The mechanical properties of the steel vary with each grade, and are specified in the standard. For example, the standard defines the minimum yields and tensile strength and the reduction in area, along with other properties. Corrosion and oxidation resistance is determined and requirements specific to welding and forming, as well as non-destructive and other tests are included.

The standard also includes rules for workmanship, packing, marking, and inspection requirements. In addition, it specifies sampling methods and acceptance criteria as well as testing methods and requirements for the acceptance of specimens.

Overall, this standard provides a comprehensive set of material requirements for the manufacture and use of chromium-molybdenum steel for boilers and pressure vessels. It defines the physical, chemical, mechanical, and other requirements that must be met by the steel to ensure reliable performance and safe operation.

JIS G 4109-1987 Chromium Molybdenum Steel for Boilers and Pressure Vessels is a pressure vessel steel standard developed by the Japanese Industrial Standard Committee, in which the properties and methods of inspection and acceptance of chromium molybdenum steels used for boilers and pressure vessels are prescribed.

Chromium molybdenum steels are metal alloys made up of chromium, molybdenum, iron, manganese, and carbon. These chromium molybdenum steels are used in components of high pressure such as a boiler or pressure vessel. They are split into two different grades, which are controlled by heat treatment processes: martensite and ferrite.

The martensite grade is designed for normal temperatures and pressures. While ferrite grade is for higher temperatures. The mechanical properties of these alloy steels are typically increased by heat treatment as well as adjustment of their chemical makeup.

The purpose of JIS G 4109-1987 Chromium Molybdenum Steel for Boilers and Pressure Vessels is to provide standards on the selection and manufacturing of chromium molybdenum steels as they are to be used in construction of boilers and pressure vessels. This standard outlines the chemical requirements, mechanical properties, and how the steel should be inspected and accepted.

Overall, JIS G 4109-1987 offers the most comprehensive and detailed information about the use of Chromium Molybdenum Steel for Boilers and Pressure Vessels. It is the perfect source for those who want to use this material for making boiler and pressure vessel components that can safely handle high pressure.