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Ultrahigh strength steels

ultrahigh strength Steel

Ultrahigh Strength Steels


0.13-0.53 Carbon, 0.10-1.00 Manganese, 0.10-1.80 Silicon, 0.65-5.50 Chromium, 0.40-12,0 Nickel, 0.15-1.75 Molybdenum, 0.05-1.20 Vanadium, 4.25-14.50 Cobalt

Common Shapes

Ultra High Strength Steels are commonly available in

  • Sheets and Plates

  • Tubes and Pipes 

  • Forgings

  • Wire

  • Rods

  • Bars

  • Castings

(Not all alloys or tempers available in all shapes)


  • Minimum yield strength of 1380 MPa

  • Ductlie

  • Hardenable


  • Machinery components

  • Car body panels

  • Crankshafts

  • Con-rods

  • Landing gear

  • Airframe parts

  • Pressure vessels


Welding of Ultrahigh Strength Steels is generally completed via the GTAW process. For some grades, matching filler alloys are recommended.


Ultrahigh Strength Steels have average machinability, but forging is the preferred shape forming process.

Commonly Used Alloys

4130 | 4140 | 4340 | AMS 6434 | 300M

D-6(a), 6150 | 8640 | H11 Modified | H13

AF 1410(c) | HP-9-4-30(d) | AerMet 100

Integ Metals // Materials // Steel // Ultrahigh Strength Steel
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An Introduction

The family of Ultrahigh Strength Steels is yet another created for a specific property, namely the highest strength and, more specifically in this case, those which have a minimum yield strength of 1380 MPa. The range of Ultrahigh Strength steels is diverse and broad in terms of composition and characteristics, so you will find the details on this page rather truncated, but please conduct further reading into Medium Carbon Low Alloy Steel, Medium Alloy Air Hardening Steel, High Fracture Toughness Steel, TWIP, TRIP, Dual Phase and Maraging Steel for more information and guidance.

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