AISI/SAE 4340 Round Bars

Need an dependable alloy steel bar stock? AISI/SAE 4340 Round Bars on MetalMitra come in round, square and hex, ready for machining, forging and shaft work.

This range covers round, square, hex and flat sections in bright, black, peeled or forged condition, ready for machine shops and component makers.

AISI 4340 is a nickel-chromium-molybdenum steel with high strength and toughness in heat-treated condition. Controlled additions of chromium, molybdenum, nickel or vanadium give alloy steel higher strength, deeper hardenability, better toughness and stronger performance at elevated temperature.

Available forms & variants

• Round Bars — Bright, black, peeled or centreless-ground rounds.
• Hex & Square Bars — Hex and square sections for turned and machined parts.
• Flat Bars — Flats for fabrication and general engineering.
• Forged & Hollow Bars — Forged bars, rings and hollow bars made to order.

Performance highlights

• High-Temperature Strength — Chrome-moly chemistry keeps its strength when temperatures climb.
• Creep Resistance — Proven in long-term, high-temperature pressure service.
• Hardenability — Heat-treats well to dial in strength and toughness.
• Durability — Performs reliably under heavy mechanical loads.

Typical applications

• Power Plants
• Boilers
• Refineries
• Petrochemical
• Oil & Gas
• Heat Exchangers
• Automotive
• Engineering Components
• Pressure Vessels
• Heavy Machinery
• Fabrication
• General Engineering

Quality checks & certification

Every lot of AISI/SAE 4340 Round Bars sourced through MetalMitra can be inspected and documented to the governing standard and your purchase order.

• Diameter & straightness inspection
• Visual and surface inspection
• Grade verification against the order
• Chemical composition verification
• Mechanical property testing
• Hardness testing as applicable
• Ultrasonic testing as applicable
• EN 10204 3.1 Mill Test Certificate

Chemical & mechanical properties

Chemical composition and mechanical properties are supplied to the limits of the governing material standard. Actual heat values are reported on the mill test certificate shared with each consignment.

Why buy through MetalMitra

• Checked sellers only — Every supplier profile is screened by MetalMitra before it goes live.
• Faster sourcing — Post one requirement and receive competitive offers without chasing calls.
• Paperwork sorted — MTC 3.1, test reports and TPI arranged as your project demands.
• Global logistics — Seaworthy packing and dispatch to project sites across the world.

Ready to buy?

Send your size, grade, quantity and delivery location for AISI/SAE 4340 Round Bars, and matching suppliers on MetalMitra will come back with offers.

Technical note: Figures shown are indicative. Final acceptance should be based on the applicable standard, approved drawings and the MTC supplied with the material.