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gb t 3077 50crni steel chemical element-Wholesale Steel The standard applies to alloy structural steel bar 250mm . GB/T 3077 Grade 20CrMo Annealed - Chromium See where GB/T 3077 Grade 20CrMo Annealed falls on the material property chart for Density against Elastic modulus in your materials selection and design process. Our Ashby charts are interactive with more technical data upon clicking.20CrNi Steel Chemical composition, Metal Properties 20CrNi. China GBT 20CrNi China structural steel and alloy steel and 20CrNi Mechanical Properties, Chemical Element, Cross Reference, Datasheet.