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AISI 4145  Technical Data AISI 4145 is a chromium molybdenum quality alloy steel specification. As a high tensile steel grade AISI 4145 is primarily supplied in the hardened and tempered condition to 30-36HRc range to AISI 4145H modified. With a slightly higher carbon content AISI 4145 is similar to AISI 4140 in that it offers good ductility, shock resisting characteristics combined with resistancee to wear. AISI 4145 is suitable for a variety of applications in the oil and gas sector. This material can be supplied to AISI steel standards. TYPICAL ANALYSIS C. Si. Mn. Cr. Mo. 0.45% 0.25% 0.85% 1.10% 0.25%        AISI 4145 30-36HRc Typical Mechanical Properties    Yield (psi) UTS (psi) % Elongation %  Reduction of Area Hardness HRC Charpy room temperature (average of 3) min 110k min 135k min 14% min 40% 30-36 54J Available section