GH1139, formerly known as GH139, is also known as 12Cr25Ni16Mn7NB, and its origin can be traced back to the 835 grade of the former Soviet Union. This austenitic steel, with its unique old-fashioned construction, exhibits impressive physical properties. Its density is as high as 7At 83 g cm, this data not only reveals its rugged nature, but also provides a solid foundation for its application in several fields. 
When we delve into its mechanical properties, the excellent quality of GH1139 is even more impressive. Whether hot-rolled or forged bars, their standard heat treatment ensures excellent performance over a temperature range of 20 to 900 °C. The tensile strength B MPa is up to 740MPa or even higher, while the yield strength is P02 MPa can also reach more than 345MPa. These values not only prove the strength of GH1139, but also reveal its excellent durability. 
In addition, the elongation δ5 % and shrinkage % of GH1139 also reach more than 45% and 20%, respectively, which means that it can exhibit excellent ductility and contraction when subjected to external forces, so as to effectively absorb and disperse the impact force. Its HB value is between 217 and 163, which further proves its excellent mechanical properties. 
GH1139 is quite similar to GH3030 alloy in terms of performance, but GH1139 is superior in some ways. Its excellent thermo-working plasticity, stable structure, and excellent welding properties make it widely used in many fields. Especially in the production of high-temperature bearing parts such as combustion chambers after stamping and welding, GH1139 has shown its unique advantages. GH1139 is also used in air ducts made of sheets, strips and profiles working under 800 950 and moderate stress.