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AISI 4140  Technical Data EN19 AISI 4140 is a chromium molybdenum quality alloy steel. AISI 4140 is primarily supplied in the hardened and tempered condition to 18-22HRc range. AISI 4140 offers good ductility, shock resisting characteristics combined with resistancee to wear. AISI 4140 is suitable for a variety of applications in the oil and gas sector.     TYPICAL ANALYSIS C. Si. Mn. Cr. Mo. 0.40% 0.25% 0.850% 1.00% 0.20%       Yield (psi) UTS (psi) % Elongation %  Reduction of Area Hardness HRC Charpy room temperature (average of 3) min 80k min 100k min 20% min 40% 18-22 50J max 110k 13 27