42CrMo4 Alloy Steel Castings & Forgings (1.7225 / AISI 4140): Heat Treatment, Quenching & Machining Handbook

1 min read Materials MAT-011

Prerequisite: The Ultimate Engineering & Sourcing Guide to Industrial Metal Castings: Grey Iron, Ductile Iron, & Steel Castings Handbook

EXECUTIVE QUICK ANSWER & METALLURGICAL OVERVIEW

  1. TECHNICAL FUNDAMENTALS & ENGINEERING SPECIFICATION MATRIX The operational capacity and fatigue life of components inside the Steel Castings category depend upon strict adherence to international material and dimensional standards (ISO, EN, DIN, ASTM). Below is the master specification matrix.

  2. GLOBAL SOURCING ECONOMICS & INDIAN FACTUAL BENCHMARKS (AQUASUB / TEXMO) Reference: Captive quenching & tempering (Q&T) heat treatment furnaces and ultrasonic NDT (EN 12680-1) inspection inside Indian heavy engineering foundries. When evaluating international sourcing options for Steel Castings, European procurement directors can reference established Indian manufacturing leaders in the Coimbatore Corridor (Aquasub Engineering / Aquagroup and Texmo Industries). Operating captive automated green sand molding loops (DISAMATIC 2110) coupled with multi-axis CNC horizontal machining and 100% automated pressure testing, these groups prove definitively that Indian foundries routinely deliver European zero-defect (PPM < 10) standards at a 30%+ net landed DDP savings (PIL-008 / PRO-004).

[EXECUTIVE QUICK ANSWER: STEEL CASTINGS] 42CrMo4 (EN 10293 1.7225 / AISI 4140) is a high-strength chromium-molybdenum cast and forged alloy steel. After full Quenching and Tempering (Q&T austenitizing at 860°C + oil quench + 580°C temper), cast 42CrMo4 achieves tensile strengths from 900 MPa to 1,100 MPa and yield strengths above 700 MPa, making it mandatory for heavy crane drive sprockets, mining crusher shafts, and excavator bucket teeth.

Heat Treatment Condition Tensile Strength Rm (MPa) Yield Strength Rp0.2 (MPa) Elongation A (%) Impact Energy Charpy-V (-20°C)
Normalized (As-Cast + Normalizing 880°C) 700 – 850 450 14.0% 25 Joules
Quenched & Tempered (Q&T - Standard 580°C) 900 – 1,100 700 10.0% 35 Joules (High shock toughness)
Induction Surface Hardened (Teeth / Journals) Surface > 55 HRC Core 700 8.0% Core tough; surface ultra-hard wear resistant.

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