Stainless Steel 316 Round Bar | Stainless Steel 316L Round Bar

Stainless Steel 316 is a molybdenum-bearing austenitic stainless steel. The addition of 2–3% molybdenum is what sets it apart from the more common grade 304: molybdenum dramatically improves resistance to pitting and crevice corrosion in chloride-rich environments such as seawater, brines, and many process chemicals. This is why 316 is often called marine-grade stainless steel.

A 316 round bar is a solid, straight length of this alloy produced by hot rolling, forging, or cold finishing. It serves as raw stock for machining shafts, valve stems, fasteners, pump components, pins, and fabricated assemblies.

316L is the low-carbon variant of the same alloy. The “L” designates a maximum carbon content of 0.030% (versus 0.08% for standard 316). That lower carbon level suppresses chromium-carbide precipitation at grain boundaries during welding, a phenomenon called sensitization which makes the 316L round bar the preferred choice for welded and heavy-gauge fabrications.

Because both grades share nearly identical composition apart from carbon, mills frequently produce dual-certified 316/316L material that meets the requirements of both grades from a single heat. Jade Alloys stocks dual-certified bar wherever possible, giving fabricators maximum flexibility.

The two grades are close cousins, but the right choice depends on how the bar will be processed and where it will operate.

Rule of thumb: if the part will be welded and cannot be re-annealed afterward, specify 316L. If the part is machined from solid or operates at elevated temperature where creep strength matters, standard 316 is often the better fit. When in doubt, order dual-certified 316/316L and cover both requirements. Our technical team is happy to advise on grade selection for your specific application.

The composition is what gives 316/316L its corrosion resistance and weldability. The table below reflects the requirements of ASTM A276 for both grades.

Why the numbers matter: the 16–18% chromium forms the passive oxide film that makes the steel “stainless.” The 2–3% molybdenum extends that protection into chloride service. The 10–14% nickel stabilises the austenitic structure, delivering excellent toughness and formability. In 316L, the tightly controlled carbon prevents carbide precipitation that would otherwise deplete chromium at grain boundaries during welding.

The following values are typical minimums for solution-annealed 316/316L round bar in the as-supplied condition per ASTM A276.

Cold working raises strength and hardness while reducing ductility, so precision-ground and cold-drawn bars carry higher mechanical values than hot-rolled stock. If your drawing calls out a specific strength or hardness band, share it with us and we will confirm what condition meets it.

Buyers around the world specify 316/316L under different national standards. Use this cross-reference when matching an existing drawing or import specification.

For aerospace and defence work, note that AMS 5648 governs 316 and AMS 5653 covers 316L. We can supply against these aerospace material specifications where the order and documentation requirements are stated at enquiry stage.

Jade Alloys carries 316 stainless bar stock across the full commercial size range and in every common cross-section.

Standard mill lengths run 1–6 metres. We also provide production bar cutting to fixed lengths, which reduces machining waste and freight cost on export orders. Let us know your billet or blank length and we will pre-cut before dispatch.

Estimating bar weight helps you compare quotes on a per-kilogram basis and plan freight. The values below are theoretical weights for solid round bar at a density of 8.0 g/cm³. For any diameter not listed, or for square, hex, and flat sections, use our online metal weight calculator.

Weights are indicative. Actual weight varies slightly with tolerance band and finish. Confirm against your certified material for billing.

Dimensional accuracy and finish are governed by how the bar is processed. We supply to ISO h-tolerance and k-tolerance bands to suit machining and slip-fit requirements.

Typical Cold-Finished Tolerances

Common ISO bands supplied: h8, h9, h10, h11, h12, h13, k9, k10, k11, k12. State the band on your enquiry and we will confirm feasibility for the chosen diameter and finish.

Surface Finishes Offered

For instrumentation and hygienic applications, turned, ground and polished (TGP) bar delivers a smooth, dimensionally consistent surface straight off the shelf, minimising secondary machining.

The corrosion resistance and toughness of these bars make them a workhorse across demanding industries.

• Marine & offshore — propeller shafts, boat fittings, dock hardware, and desalination components rely on 316’s chloride resistance. This is the classic marine-grade application.
• Oil & gas — valve stems, pump shafts, wellhead components, and downhole tooling. 316/316L conforms to NACE MR0175 / ISO 15156 requirements when supplied in the correct hardness condition for sour service.
• Chemical & petrochemical — reactor internals, agitator shafts, and fasteners exposed to acids and process media where 304 would corrode.
• Pharmaceutical & food processing — 316L is the standard for hygienic equipment, mixing shafts, and CIP-compatible components thanks to its cleanability and weldability.
• Power generation — heat-exchanger tie rods, turbine components, and fasteners in condensate and cooling-water service.
• Architecture & infrastructure — balustrades, anchor bolts, and structural pins in coastal or de-icing-salt environments.
• Aerospace & defence — precision-machined parts to AMS 5648 / AMS 5653. 

Traceability is not optional in code-governed work, and our quality system reflects that. Every consignment of 316 stainless bar stock is supported by:

• EN 10204 3.1 mill test certificates traceable to the heat number
• Chemical composition reports confirming grade conformance
• Mechanical test reports — tensile, yield, elongation, hardness
• PMI (Positive Material Identification) on request to verify grade before dispatch
• Third-party inspection — Lloyd’s, BV, SGS, DNV, TÜV and similar, arranged at your instruction
• NDT and destructive test reports where the specification calls for them
• Testing through NABL-approved laboratories

We also provide dual certification (316/316L) and NACE MR0175 / ISO 15156 compliance statements where the order requires them. Full material documentation travels with the goods, so your incoming inspection and audit trail stay clean.

Explore our quality policy and certificates for more on our approach to assurance.

• Deep ready stock — 4 mm to 500 mm on the shelf in Mumbai, so small and large orders ship quickly.
• Genuine mill material — bars sourced from reputed mills of Japanese, European, and American origin, each with full traceability.
• Certified every time — EN 10204 3.1 MTCs, PMI, and third-party inspection as standard, not as an upcharge afterthought.
• Export expertise — we regularly supply the UAE, Saudi Arabia, Kuwait, Qatar, Singapore, Malaysia, the USA, Germany, and beyond, with documentation and packing tuned for smooth customs clearance.
• Technical support — real grade-selection advice from people who know the metallurgy, not a call-centre script.
• Competitive pricing — direct supply and honest per-kg quoting on your exact size and quantity.

We supply the same 316/316L quality as a stainless steel round bar manufacturer, a stainless steel bar exporter, and a stainless steel rod supplier — one point of contact for stock, cutting, certification, and shipping.

• SS 304 / 304L Round Bar  
• SS 317 / 317L Round Bar  
• SS 321 / 321H Round Bar 
• SS 347 / 347H Round Bar  
• SS 904L Round Bar  

New to bar products? Our guide on what a round bar is, its types and benefits is a useful primer.

As a government-recognised export house, Jade Alloys ships SS 316/316L round bars to project sites, stockists, and OEMs across five continents. Every consignment leaves our works with EN 10204 3.1 documentation, Certificate of Origin, and export-grade, ISPM 15-compliant packing tuned to the destination port and customs regime.