316/316L Stainless Steel Round Bars

Corrosion Resistance: Excellent resistance to pitting and crevice corrosion in chloride-containing environments, seawater, and aggressive chemical media, thanks to 2–3% molybdenum content. The low carbon 316L version provides enhanced resistance to intergranular corrosion after welding.

Excellent Machinability: Good chip formation and surface finish characteristics for precision turning, milling, drilling, and threading operations. 316L offers improved machinability for complex parts.

Superior Weldability: 316L grade ensures low carbon content for superior weld performance, with reduced risk of intergranular corrosion in welded fabrications. Suitable for TIG, MIG, laser, and resistance welding.

High Mechanical Strength: Excellent tensile and yield strength with good ductility for shafting, fasteners, and structural applications requiring load-bearing capacity.

Precision Dimensional Tolerances: Tight diameter tolerances (h6, h7, h8, h9, h11) ensure consistent material for precision machining and automatic lathe operations.

Smooth Surface Quality: Available in black (hot-rolled), peeled (bright), turned, ground, and polished finishes for various manufacturing requirements.

Non-Magnetic Properties: 316/316L round bars exhibit low magnetic permeability in the annealed condition, suitable for sensitive instrumentation and electronic applications.

International Certifications: Round bars can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with ASME, ASTM, EN, and JIS standards.

Both 316 and 316L stainless steel round bars exhibit excellent corrosion resistance and mechanical properties. The lower carbon content in 316L minimizes carbide precipitation during welding, providing enhanced resistance to intergranular corrosion compared to standard 316, especially in welded fabrications and high-temperature service environments.

Heat Treatment Condition:
Both 316 and 316L stainless steel round bars are normally supplied in the annealed condition. Solution annealing at 1040–1080°C followed by rapid cooling (water quenching) restores full corrosion resistance, relieves internal stresses from rolling or forging, and ensures optimal ductility for further machining operations.

Delivery Condition Options:

l Black (Hot-Rolled): As-rolled with mill scale – for further processing

l Bright (Peeled/Turned): Smooth, oxide-free surface – for precision machining

l Centerless Ground: Precision ground to tight tolerances – for shafting and instrumentation

l Polished: Smooth mechanical finish – for decorative and sanitary applications

Precision Ground Tolerances (Centerless Ground):

Standard Lengths:

Random Lengths: 3000mm – 6000mm (hot-rolled)

Fixed Lengths: 3000mm, 4000mm, 5000mm, 6000mm

Custom lengths available upon request

Straightness Tolerances:

*Formula: Weight (kg/m) = Diameter² (mm) × 0.006165*

Raw Material Selection: High-quality 316/316L stainless steel billets from certified mills (Baosteel, TISCO, POSCO, Outokumpu) with certified chemical composition and traceability.

Heating: Billets heated to 1150–1250°C in reheating furnaces for hot rolling or forging.

Hot Rolling (HR): Heated billets passed through roughing and finishing stands to reduce diameter to required size (hot-rolled round bars). Multiple passes ensure consistent dimensions.

Cooling: Controlled cooling to prevent surface defects and ensure uniform microstructure.

Solution Annealing: Annealing at 1040–1080°C to restore corrosion resistance and ductility.

Pickling: Removal of oxide scale for bright finish (optional).

Straightening: Roller straightening to ensure straightness tolerance within 0.5mm per meter.

Peeling/Turning (Optional): Removal of surface defects and decarburized layer using peeling machine or lathe to produce bright finish with consistent diameter.

Cold Drawing (Optional): Hot-rolled bars drawn through carbide dies to achieve precise dimensions (h9 tolerance) and improved surface finish.

Centerless Grinding (Optional): Precision grinding using centerless grinder to achieve h6 tolerance and superior surface finish for shafting applications.

Cutting: Cut to specified lengths (random or fixed) using cold saws or band saws.

Inspection & Testing: Dimensional check, PMI, mechanical testing, surface inspection.

Marking & Packing: Each bundle tagged with grade, heat number, dimensions, and standard.

Chemical Analysis: Spectrometer verification or PMI (Positive Material Identification) for alloy elements (Cr 16-18%, Ni 10-14%, Mo 2-3%).

Mechanical Testing: Tensile strength, yield strength, elongation, reduction of area, hardness per ASTM A370.

Dimensional Inspection: Diameter, length, straightness, roundness using micrometers, calipers, and straightness gauges.

Surface Inspection: Visual check for surface defects, cracks, seams, laps, and decarburization.

Ultrasonic Testing (UT): Per ASTM A388 for internal flaw detection (upon request).

Eddy Current Testing (ECT): For surface defect detection on cold drawn bars.

Intergranular Corrosion Test: ASTM A262 Practice E for 316L (upon request).

Ferrite Content: Not applicable for austenitic grades.

Third-Party Inspection: SGS, BV, DNV, TUV, LR, ABS available upon customer request.

Shafts & Axles: Pump shafts, motor shafts, agitator shafts, propeller shafts, marine drive shafts, conveyor rollers, idler shafts, fan shafts, mixer shafts, auger shafts.

Fasteners: Bolts, screws, studs, nuts, threaded rods, anchor bolts, eye bolts, U-bolts, set screws, machine screws, socket head cap screws for marine and chemical service.

Valve Components: Valve stems, valve balls, valve seats, valve spindles, bonnet studs, actuator shafts, trim components, gate valve wedges, globe valve discs.

Pump Components: Pump shafts, impeller shafts, pump studs, pump bolts, wear rings, bushings, thrust collars, lantern rings.

Precision Machined Parts: Turned components, CNC machined parts, instrument components, sensor housings, connector pins, spacers, sleeves, bushings, collars.

Marine Hardware: Boat shafting, propeller shafts, rudder stocks, marine fittings, deck hardware, winch drums, mooring cleats, capstan shafts, steering components.

Chemical Equipment: Agitator shafts, mixer shafts, reactor components, heat exchanger tie rods, column internals, distillation tray supports.

Food Processing Machinery: Mixer shafts, cutter shafts, auger shafts, conveyor rollers, guide rails, food contact components, dough hooks, blender shafts.

Pharmaceutical Equipment: Cleanroom components, instrument shafts, precision rollers, guide pins, alignment dowels, tablet press components.

Instrumentation: Sensor shafts, gauge components, precision pins, dowel pins, alignment shafts, measurement probes, thermowell stems.

1. What is the difference between 316 and 316L stainless steel round bars?
The main difference is carbon content. 316L has lower carbon (≤0.03% vs ≤0.08%), which prevents carbide precipitation during welding and provides better resistance to intergranular corrosion. For welded components, 316L is typically preferred.

2. What is the maximum diameter available for 316/316L round bars?
Standard diameters up to 300mm. Larger diameters up to 500mm are available upon request with extended lead time.

3. What surface finish is best for precision machining?
Bright (peeled) or centerless ground finish is recommended for precision machining. These finishes provide consistent diameter tolerances (h9 or h6) and smooth surface finish (Ra 0.2-1.6μm), reducing tool wear and improving part quality.

4. Can 316 round bars be used for hydraulic cylinder applications?
Yes, with centerless ground finish (h6 tolerance) and polished surface, 316/316L round bars are suitable for hydraulic cylinder rods and piston rods in corrosive environments.

5. Do you provide material test reports (MTR) and certification?
Yes, every shipment includes EN 10204 Type 3.1 MTR with chemical analysis and mechanical properties. Third-party inspection (SGS, BV, DNV, ABS, TUV) available upon request.

6. Are 316/316L round bars suitable for marine shafts?
Yes, 316/316L round bars offer excellent resistance to seawater corrosion and are widely used for boat shafts, propeller shafts, and marine hardware. ABS/DNV/LR certifications available.

7. What is the standard length for 316/316L round bars?
Standard random lengths are 3000mm-6000mm. Fixed lengths of 3000mm, 4000mm, 5000mm, and 6000mm are available. Custom lengths can be cut to order.

Complete Diameter Range: From 6mm to 300mm – all standard sizes in stock

Multiple Surface Finishes: Black, peeled, turned, cold drawn, ground, polished – all available

Precision Tolerances: h6, h7, h8, h9, h11 – meet your machining requirements

Full Traceability: Heat number on each bundle – traceable to original mill certificate

Marine Certified: ABS, BV, DNV, LR, GL certifications available

Large Inventory: Over 5,000 tons in stock – ready for immediate dispatch

Custom Cutting: Cut to exact lengths per order

Testing Available: UT, PMI, mechanical testing, corrosion testing – all available

Global Delivery: Exported to over 50 countries with reliable logistics support

Website: www.womicstainless.com

E-mail: info@womicstainless.com

Tel / WhatsApp / WeChat:

Victor: +86 15575100681

Jack: +86 18390957568

Womic Steel – Your reliable partner for high‑quality stainless steel products, precision machined components, and custom solutions for corrosion‑resistant applications.

Stock Examples (316L Stainless Steel Round Bars – Bright Peeled Finish – Precision Grade):

Stock Examples (316L Stainless Steel Round Bars – Centerless Ground Finish – High Precision):

Stock Examples (316 Stainless Steel Round Bars – Cold Drawn Finish – Fastener Grade):

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