概述
42CrMo (GB/T 3077) is a medium-carbon, chromium-molybdenum alloy structural steel widely used for high-strength machine components requiring good toughness, hardenability, and wear resistance. With 0.38–0.45% carbon, 0.90–1.20% chromium, and 0.15–0.25% molybdenum, it responds well to quenching and tempering (Q&T), achieving tensile strengths of 980–1,200 MPa with good ductility. 42CrMo round bar is one of the most commonly specified alloy steel bars in Chinese mechanical engineering, serving as the domestic equivalent of AISI 4140 / 42CrMo4 (EN). It is supplied in spheroidize-annealed, normalized, or quenched-and-tempered condition for machining into shafts, gears, bolts, and pressure-bearing components.
描述（英文）
Vertex 42CrMo steel round bar is a medium-carbon chromium-molybdenum alloy structural steel conforming to GB/T 3077, equivalent to AISI 4140 / EN 42CrMo4 (1.7225) / JIS SCM440. With 0.38–0.45% carbon, 0.90–1.20% chromium, and 0.15–0.25% molybdenum, it delivers excellent hardenability, high tensile strength (980–1,200 MPa after quenching and tempering), good toughness, and superior wear resistance. The molybdenum addition effectively prevents temper embrittlement, making it suitable for high-stress applications. Available in hot-rolled, forged, peeled, and cold-drawn finishes, 42CrMo round bar is supplied in annealed, normalized, or quenched-and-tempered condition, with diameter ranges from 10 mm to 800 mm. It responds well to induction hardening, nitriding, and standard machining operations. Widely used in automotive, heavy machinery, oil & gas, power generation, and industrial fastener manufacturing for crankshafts, gears, drill collars, high-strength bolts (Grade 10.9/12.9), hydraulic cylinder rods, and pressure-bearing components. FAQ:
Q: What are the equivalent grades of 42CrMo?
A:42CrMo is equivalent to AISI 4140 (USA, UNS G41400), EN 42CrMo4 / 1.7225 (Europe), JIS SCM440 (Japan), BS 708M40 / En19 (UK), and DIN 1.7225 (Germany).
