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40CrNi2Mo, also known as 4340 steel, is a kind of low alloy ultra-high strength steel.Only steels with tensile strength greater than [TJC STEEL]1400MPa and yield strength greater than 1200MPa at room temperature are termed "ultra-high strength steels".4340 steel is a typical ultra high strength steel, which is obtained by heat treatment.
Standards: CHINA GB/T 3077-2015 40CrNi2Mo,A50400 GB/T 34484.2-2018 40CrNi2Mo GB/T 38809-2020 40CrNi2MoA GB/T 5216-2014 40CrNi2MoH USA ASTM A29-2005[TJC STEEL] ASTM A322-2007 4340,G43400 JAPAN JIS G4053-2003 SNCM439 GERMANY DIN EN 10263-4:2002 41NiCrMo7-3-2,1.6563 Chemical Composition(%): Grade A50400 4340 SNCM439 1.6563 C 0.38~0.43 0.38~0.43 0.36~0.43 0.38~0.44 Si 0.17~0.37 0.15~0.35 0.15~0.35 ≤0.30 Mn 0.60~0.80 0.60~0.80 0.60~0.90 0.60~0.90 P ≤0.030 ≤0.035 ≤0.030 ≤0.025 S ≤0.030 ≤0.040 ≤0.030 ≤0.025 Cr 0.70~0.90[TJC STEEL] 0.70~0.90 0.60~1.00 0.70~0.90 Ni 1.65~2.00 1.65~2.00 1.60~2.00 1.65~2.00 Mo 0.20~0.30 0.20~0.30 0.15~0.30 0.15~0.30 Cu ≤0.30 ≤0.35 ≤0.30 ≤0.25 Mechanical Property: QUENCHED FIRST TIME NORMALIZED AT 890℃,OIL QUENCHING SECOND TIME 850℃,OIL QUENCHING TEMPERED(AIR COOLING) 560~580℃ 220℃ TWICE OIL QUENCHING TENSILE STRENGTH MPa ≥1050 ≥1790 YIELD STRENGTH MPa ≥980 ≥1500 ELONGATION % ≥12 ≥6 REDUCTION OF AREA %[TJC STEEL] ≥45 ≥25 IMPACT TESTJ ≥48 -- TEMPERED HARDNESS ≤269HBW Performance Applications: 4340 steel after heat treatment, not only obtain ultra-high strength, but also have good plastic toughness, excellent fatigue performance, fracture toughness and stress corrosion resistance, good comprehensive mechanical [TJC STEEL]properties, so that it is often used in the industry as a tempering steel to manufacture bearings, gears and crankshafts, and in the aircraft structure has been widely used.Such as aircraft landing gear, helicopter rotor shaft and turbojet turbine shaft and other moving parts. Comments are closed.
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HENAN SCALE IMP&EXP CO.,LTD
ZHENGZHOU ZHIYUAN IMP&EXP CO.,LTD
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