Stainless Steel 317L Round Bar

SS 317L round bar is the low-carbon form of grade 317 stainless steel. It is commonly identified as UNS S31703 and is a chromium-nickel-molybdenum austenitic alloy. Molybdenum contributes to resistance against pitting and crevice corrosion under suitable conditions, and the restricted carbon content helps reduce chromium-carbide precipitation associated with welding or thermal exposure.

Typical uses include machined components for chemical processing, pulp and paper equipment, pumps, valves and selected heat-exchanger assemblies. The material is not immune to corrosion: chloride concentration, temperature, crevices, applied stress and fabrication details all affect suitability.

For grade comparisons, see Stainless Steel 317 Round Bar, Stainless Steel 316L Round Bar and Stainless Steel 904L Round Bar.

SS 317L round bars are used where a combination of corrosion resistance, fabrication characteristics and machinable bar stock is required. Final material selection depends on operating temperature, chemical concentration and the applicable design code.

• Chemical processing: Pump shafts, valve parts, fasteners and machined components for selected corrosive process streams.
• Pulp and paper: Components for equipment exposed to certain bleaching and processing chemicals, subject to a service-specific corrosion assessment.
• Heat exchangers: Bar-stock components such as supports and fittings used in suitably specified exchanger assemblies.
• Pharmaceutical and food production: Machined components where cleaning processes, surface finish and hygiene requirements permit the grade.
• Water and coastal facilities: Selected corrosion-resistant hardware, with specific evaluation for seawater, stagnant conditions and crevice exposure.
• General engineering: Precision-machined shafts, connectors and fasteners when corrosion and mechanical requirements justify the alloy.

SS 317L is not automatically suitable for all seawater, sour-service or stress-corrosion environments. Check actual process conditions and the governing specification.

Bar forms and product finishes for SS 317L

To cope with the numerous requirements of commercial programs, we offer SS 317L Round Bars in multiple forms:

Reference size and supply information

All diameters, lengths, forms and finishes shown are enquiry references, not a live-stock guarantee. Confirm tolerance and supply condition for each diameter.

Reference chemical composition of UNS S31703

The original composition ranges below are retained as reference information. Check them against the agreed edition of the governing material standard and the supplied mill test certificate; actual heat chemistry must meet the ordered requirements.

All values are mass percent. The low-carbon grade is distinguished by its maximum carbon requirement; alloy limits must be checked for the applicable specification.

Reference mechanical properties

Original page reference values are shown below. They are not a guarantee for every size, bar condition or standard. Verify tensile requirements, test method and hardness limits against the purchase specification and MTC.

Mechanical values depend on product specification, size and supply condition. The stated reduction-of-area and hardness figures should not be treated as universal acceptance limits.

Related designations and product standards

UNS, EN and JIS designations are comparison references rather than proof of automatic interchangeability. Confirm chemical limits, mechanical requirements and product form before substitution.

For traceable industrial supply, confirm how the manufacturer identifies the grade, heat number, size, product standard and supply condition. Marking on short or finished pieces may differ from marking on full-length bars; any additional requirements should appear on the purchase order.

Ask for the required inspection certificate, such as EN 10204 Type 3.1 when specified, together with the material heat chemistry, applicable mechanical test results and any agreed supplementary tests. Certificates and test scope depend on the order.