Here is a condensed English version of the FTD420 product description, reduced to approximately half the original length while retaining all key technical and commercial information.
Designed for automotive drivelines, construction machinery, and heavy equipment, the FTD420 is a precision forged shaft made from 42CrMo alloy steel (equivalent to AISI 4140, DIN 42CrMo4, SCM440). It offers an exceptional strength toughness balance, high fatigue resistance, and reliable load capacity, making it ideal for crankshafts, drive shafts, wind turbine main shafts, and oil drill connectors.
Configuration
Each FTD420 is customproduced to customer drawings. The standard supply includes:
– One piece forged shaft (solid, hollow, or with flanges/steps/splines/threads)
– Full material certificates and mechanical test reports
– NDT reports (UT + MT)
– Heat treatment records (quench/temper, optional induction hardening)
All products are processed from billet through forging, heat treatment, and machining to ensure dense microstructure and stable performance.
Material & Chemistry
Manufactured from electric arc + vacuum degassed 42CrMo, free from porosity and inclusions. Typical composition: C 0.38–0.43, Si 0.15–0.35, Mn 0.75–1.00, Cr 0.80–1.10, Mo 0.15–0.25, P/S ≤0.04. The steel offers high hardenability (up to Ø80 mm), no temper brittleness, and good low temperature impact toughness.
Mechanical Properties
After quenching and tempering (tempered sorbite structure):
– Tensile strength ≥1080 MPa
– Yield strength ≥930 MPa
– Hardness ≤217 HB (as supplied)
– Impact energy ≥63 J, elongation ≥12%
Optional induction hardening raises surface hardness to HRC 35–45 with customisable case depth.
Forging & Grain Refinement
Multi direction upsetting and drawing at 1150–1200°C (finish >850°C), forging ratio ≥4:1. This eliminates cast defects, refines grain to ASTM 6–10, and creates continuous metal flow lines that boost fatigue life.
Dimensional Tolerances
Precision machining holds critical dimensions to IT7 grade, straightness ≤0.2 mm/m, journal run out ≤0.005 mm, spline indexing error ≤0.01 mm, and diameter tolerance –0/+3 mm (as forged). This ensures precise fit with bearings and gears, reducing assembly costs.
Heat Treatment
Standard cycle: normalising (870–880°C, air cool), then oil quenching from 830–850°C, tempering at 480°C. Optional induction hardening (890–900°C, air cool, 65°C/s) and low temperature tempering are available. All parameters are tightly controlled for consistent microstructure.
Surface & Delivery
Available in black as forged, ground, or turned condition. Additional surface treatments (phosphating, chrome plating, etc.) can be supplied on request.
Quality & NDT
Each shaft is 100% inspected by UT (GB/T 6402, defect ≤Φ2 mm, depth ≥200 mm) and MT (JB/T 6061, crack sensitivity ≥0.01 mm). Batch sampling includes tensile, impact, and hardness tests. Raw materials are spectrometrically verified, and each forging receives three chemical analyses and UT checks before release.
Integration & Customisation
The FTD420 fits directly to gearboxes, drive axles, reducers, motors, and cranes; ends can be splined, flanged, or threaded. We offer full customisation: diameters Ø80–1200 mm, weights up to 50 t, lengths up to 30 m, solid or hollow, with complex geometries. Turnkey service from billet to finished part is available.
Market Advantages
Built on mature hot forging technology (open die and closed die), 42CrMo in the quenched tempered state provides high fatigue strength, low notch sensitivity, and excellent resistance to shock and alternating loads. Our core strengths: ≥1080 MPa tensile strength, extended fatigue life (>20 years in many applications), IT7 precision, full process traceability, and flexible non standard solutions. Widely used in automotive, construction, wind energy, and petrochemical sectors.
For drawings, CAD models, or application discussions, contact our engineering team. We support you from prototype to mass production.
