1.Specialized for 10 years 2.Carbon,stainless and alloy steel 3.Certified by ISO,GL,ABS 4.Heat treatment:N+Q+T 5.MOQ for 1Pc 1.Features: Types of forged ring 34crnimo2.Stabdards: ASME,ASTM,GB,JIS,DIN3.Materials" carbon steel,stainless steel and alloy steel.4.Certificates: ISO,GL and ABS5.Min Order: for 1 pc6.Best Quality and competitive price! forged alloy steel ring 30crnimo8/34crnimo