Stainless Steel 317 Round Bar

Grade 317 is an austenitic chromium-nickel-molybdenum stainless steel. Its nominal molybdenum range is higher than that of conventional Grade 316, which can help improve resistance to pitting and crevice corrosion in certain chloride-bearing and chemical-process environments. It is not immune to chloride corrosion or stress-corrosion cracking.

SS 317 round bar is a solid cylindrical product used to make shafts, valve parts, fittings, fasteners and other machined components. The bar grade does not by itself determine suitability: service chemistry, temperature, stress, finish and fabrication method must also be considered.

Buyers often compare Grade 317 with SS 316 Round Bar for corrosion requirements or SS 317L Round Bar when lower carbon content is preferred for welded assemblies.

Grade 317 is selected for components in environments where corrosion performance is a major material-selection factor. Typical application categories include:

• Chemical processing: machined valve parts, pump components, fasteners and equipment fittings exposed to selected chemical media.
• Pulp and paper: components in process equipment where resistance to certain corrosive solutions is required.
• Heat exchangers: bar-machined supports and fittings where temperature, process fluid and design standards permit Grade 317.
• Marine-adjacent equipment: selected fasteners and hardware, subject to chloride exposure and crevice-corrosion assessment.
• Industrial fabrication: shafts, pins and general machined parts requiring stainless steel with higher molybdenum content.

For seawater immersion, highly concentrated chlorides or strongly reducing chemicals, separate corrosion testing or another alloy may be required. Grade 317 should not be assumed suitable solely because it is stainless steel.

Product form, finish and machining requirements affect the applicable tolerances and inspection criteria. The following forms are described in the original product information; availability for SS 317 should be confirmed before ordering.

Source-listed indicative size information: The original page references diameters of 5–500 mm, lengths up to 6 metres, and bright, black or polished finishes. These are not verified stock commitments and do not imply that every size or finish is supplied under each standard.

ASTM A276 and ASTM A479 are bar-related specifications commonly referenced for this grade. Confirm the exact edition, size limitations, processing condition and acceptance requirements on the purchase order.

The chromium, nickel and molybdenum combination contributes to the alloy's corrosion performance. The following figures are reproduced from the supplied source table for reference.

Values are indicative and must be checked against the exact applicable standard and edition. Maximum values should not be interpreted as fixed chemical contents. The material test certificate should give the actual heat analysis.

Strength and ductility depend on processing condition, bar size, test direction and the applicable standard. These values are retained from the original page and should not be treated as universal guaranteed minima.

Confirm whether each value is a required minimum, maximum or illustrative value for the ordered condition. For design, rely on the governing material specification and certified test results.

UNS S31700 is the primary designation used for the Grade 317 material discussed here. Cross-standard designations in the original page are shown for reference, not as automatic substitution approvals.

Correction: DIN/EN 1.4404 belongs to Grade 316L, not SS 317, so it has been removed from this page's SEO title. For an SS 317 order, confirm the required UNS designation and check all relevant chemistry and mechanical limits before accepting a cross-standard grade.

Related materials: SS 316 Round Bar, SS 317L Round Bar and SS 904L Round Bar. These grades are not direct substitutes without engineering review.

For a useful quotation, provide the required grade, diameter, bar length, total quantity, standard and edition, finish, delivery location and desired schedule. Add requirements for PMI, ultrasonic testing, heat traceability and third-party inspection if applicable.

Material identification may include heat number, grade and size according to the supply agreement; marking and certification requirements should be established before dispatch. Send your SS 317 requirement for a quotation.