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High-Strength & Fatigue-Resistant Alloy Steel

Technical Metallurgy & Processing Capabilities: Alloy Steel

Alloy steels are formulated with critical alloying elements including Chromium, Molybdenum, Nickel, and Vanadium to achieve superior deep through-hardenability, torsional endurance, and elevated fatigue limits. ER Industries forges and CNC machines AISI 4140, 4340, EN24, and H13 for high-load aerospace, automotive powertrain, mining, and military transmission systems.

Certified Material Grades & Equivalents Processed

AISI 4140 / 42CrMo4 (Chrome-Moly)
AISI 4340 / 36CrNiMo4 (Nickel-Chrome-Moly)
EN24 / BS 970 817M40
AISI 8620 (Case-Hardening Gear Steel)
H13 / DIN 1.2344 (Hot-Work Tool Steel)
52100 / 100Cr6 (Bearing Steel)

Key Mechanical & Physical Engineering Properties

Mechanical Parameter Engineering Value / Test Metric
Tensile Strength 850 – 1400 MPa (120,000 – 200,000 psi)
Yield Strength 680 – 1250 MPa
Hardness Range HRC 28 to HRC 60 (Custom heat-treated)
Fatigue Limit Extremely high cyclic torsional endurance
Low-Temp Impact Charpy V-Notch > 42J @ -40°C
Heat Treatment Austenitized at 845°C, Oil Quenched, Tempered

International Manufacturing & Testing Standards

ASTM A29 / A29M ASTM A322 AMS 6415 (Aerospace 4340) DIN EN 10083-3 API 6A Material Class AA–FF

Manufacturing Processes Available for This Material

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100% NDA Protection • Ingot Heat Code Certification
Primary Application Sectors
Aerospace Landing Gear Linkages High-RPM Automotive Pinions & Yokes Defense Armored Drive Shafts Downhole Drilling Drill String Bits High-Pressure Hydraulic Cylinders
Alloy Steel
Melt Certified Stock
Alloy Steel Production Line

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