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Alloy Steel · Nickel-Chromium-Molybdenum Alloy Steel Bar

8640 Round Steel Bar

A medium-carbon alloy steel used for quenched-and-tempered components requiring strength, toughness, and fatigue resistance. Request Pricing

8640 Round Bar: Material Profile

8640 offers through-hardening capability and balanced mechanical properties for moderate and heavy sections.

Specify the annealed, normalized, or quenched-and-tempered condition along with hardness, tensile properties, straightness, and testing.

Purchase to the controlling ASTM, SAE, AMS, or customer specification. Section size, supply condition, mechanical properties, surface limits, testing, and heat/lot traceability can change the acceptable material and processing route.

Product form Round bar; other long-product forms by inquiry
Condition Hot rolled, cold finished, annealed, or heat treated as required
Quote details Specification, size, condition, quantity, testing, and delivery

Key Characteristics

  • Good through-hardening
  • High strength
  • Good toughness
  • Good fatigue resistance

Common Applications

  • Shafts and axles
  • Gears and couplings
  • Heavy-equipment parts
  • Forged industrial components

Specification Requirements

Identify the governing specification and revision, product form, section size, condition, mechanical properties, testing, and certification requirements. The purchase specification and material certification govern the order.

Request a Quote for 8640 Round Bar

The material field is prefilled with 8640 and remains editable. Add the specification, size, condition, quantity, processing, testing, required date, and ship-to location.

Premium Steel Sales
Ohio Bar & Metal Co. is the round bar division of Premium Steel Sales LLC.

Premium Steel Sales handles customer setup and invoicing. Flat-rolled carbon and coated steel can be quoted through the same sales contact.

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