Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements. PRODUCT PARAMETERS As shown below, here are some tables helping you know more about basic high performance valve gate data: 1. Common base material and chemical composition Common base material and chemical composition�wt.%� Mat Type C Si Mn P S Cr Mo Ni Cu Nb Al Ti Co Fe 4130 0.28-0.33 0.15-0.35 0.4-0.6 �0.025 �0.025 0.8-1.1 0.15-0.25 �0.03 �0.03 Bal 4140 0.38-0.45 0.15-0.35 0.75-1.0 �0.025 �0.025 0.8-1.1 0.15-0.25 Bal 410 0.08-0.15 �1.0 �1.0 �0.025 �0.025 11.5-13.5 �0.75 Bal