Pezzi fusi e forgiati in acciaio legato 42CrMo4 (1.7225 / AISI 4140): manuale su trattamento termico, tempra e lavorazione meccanica
RISPOSTA RAPIDA ESECUTIVA E PANORAMICA METALLURGICA
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.GLOBAL SOURCING ECONOMICS & INDIAN FACTUAL BENCHMARKS (
Aqua Group / 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 (Aqua Group 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&Taustenitizing 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.
| Condizione di trattamento termico | Resistenza alla trazione Rm (MPa) | Limite di snervamento Rp0.2 (MPa) | Allungamento A (%) | Impact Energy Charpy-V (-20°C) |
|---|---|---|---|---|
Normalized (As-Cast + Normalizing 880°C) |
700 – 850 | 450 | 14,0% | 25 Joule |
Quenched & Tempered (Q&T - Standard 580°C) |
900 – 1.100 | 700 | 10,0% | 35 Joules (High shock toughness) |
Induction Surface Hardened (Teeth / Journals) |
Superficie > 55 HRC | Nucleo 700 | 8,0% | Nucleo duro; superficie ultradura resistente all'usura. |