Austenitic Stainless Steel Precision Bar – 304L / 316L / 321

• 3 mainstream austenitic precision solid bars: 304L, 316L, 321, fully produced to ASTM A276 bar specification
• Ultra-low carbon L-grade (304L / 316L) eliminates welding intergranular sensitization risk
• 316L added molybdenum for outstanding chloride pitting & seawater corrosion resistance
• Titanium stabilized 321 prevents chromium carbide precipitation under long high-temperature cycling
• All grades non-magnetic after solution annealing, excellent ductility for precision CNC machining
• Hot rolled / cold drawn precision stock, tight diameter tolerance, smooth uniform surface
• Custom round/square/hex shape, full cutting, turning, threading per CAD/PDF drawings
• Multi-scenario matching for food, marine, chemical, high-temperature furnace equipment blanks

This series austenitic stainless precision bars are manufactured by hot rolling + cold drawing precision forming, followed by standardized solution annealing & water quenching to obtain uniform single-phase austenite microstructure. Three targeted grades cover diversified industrial corrosion & temperature demands:

304L low-carbon general grade is cost-effective for common welded equipment in freshwater & atmospheric environments; Moly-alloyed 316L is the standard marine & pharmaceutical material with superior chloride resistance; Ti-stabilized 321 is specially designed for long-term high-temperature cyclic working conditions without post-weld heat treatment. Precision bar has tight dimensional tolerance and low surface roughness, directly used as raw stock for shafts, bolts, valve cores, equipment supports and mechanical fittings, widely supplied to food machinery, seawater desalination, chemical pipelines, furnace and aerospace industries.

Ultra-low carbon version of standard 304 stainless steel, carbon ≤0.03% restricts chromium carbide precipitation after welding. Good atmospheric & freshwater corrosion resistance, cost competitive, ideal general welded structural parts, food equipment and low-corrosion mechanical blanks.

Molybdenum containing low-carbon austenitic steel. Moly greatly improves pitting & crevice corrosion resistance in brine, seawater and dilute acids; low carbon guarantees weld stability, the first choice for marine, pharmaceutical and chloride-containing industrial equipment.

Titanium stabilized heat-resistant stainless steel. Ti element combines free carbon to avoid intergranular corrosion under 430–870℃ thermal cycling; stable oxidation resistance at high temperature, perfect furnace exhaust, heat exchanger and high-temperature welded components.

• Austenitic Stainless: 304, 304L, 316, 316L, 321, 347, 310S, 904L, 254SMo
• Duplex Stainless: 2205, 2507, S32750, F51, F55
• Ferritic Stainless: 409, 430, 439, 444
• Martensitic Stainless: 410, 420, 431, 440C
• PH Stainless: 17-4PH, 15-5PH, 17-7PH
• Nickel Alloys: Monel400/K500, Incoloy825, Inconel600/625, Hastelloy C276
• Alloy & Carbon Steel: A105, 4140, F22, F91, A516 Gr.70

304L cost-effective general welded material; 316L marine/chloride resistant; 321 high-temperature stabilized for cyclic heating service, one-stop grade selection.

304L & 316L limit carbon below 0.03%, avoid intergranular corrosion after heavy welding, no post-weld annealing required.

Titanium captures free carbon, no sensitization under repeated high-temperature heating, reliable for furnace & exhaust long-term service.

Cold drawn precision bar achieves tight diameter tolerance, smooth surface, reduce secondary grinding workload for precision parts.

All grades non-magnetic, excellent ductility for turning, milling, threading, stamping and all complex precision machining.

• 304L: Food machinery shafts, pharmaceutical frame bars, freshwater pipeline fittings, architectural welded structural blanks
• 316L: Seawater pump spindles, marine valve stems, desalination equipment bolts, chemical acid resistant fittings
• 321: Furnace roller bars, engine exhaust shafts, heat exchanger core rods, high-temperature reactor fasteners
• General: Precision machinery pins, hydraulic valve cores, instrument hardware, sanitary grade connecting rods

We provide integrated hot rolling & cold drawn precision bar production, full CNC custom processing per customer CAD drawings:

• Fixed-length cutting, facing, centering, external turning & chamfering
• Precision threading, spline machining, cylindrical grinding, mirror polishing
• Solution annealing / bright drawing custom heat treatment service
• Pickling, passivation, electropolishing surface finishing

We supply 304L / 316L / 321 precision round/square/hex stainless bars for food, marine, chemical & furnace global industrial clients.

• 100% UT surface & internal rolling defect inspection
• Full batch tensile, yield & hardness mechanical testing per heat lot
• Micrometer precision diameter & straightness tolerance control
• Spectrometer full chemical composition verification
• Metallographic austenite microstructure inspection

Mill Test Certificate EN 10204 3.1 can be issued and delivered with shipment documents before delivery.

- Inner: Individual plastic tube sleeve + waterproof anti-rust film wrap

- Outer: Reinforced fumigated wooden pallet with separation strips to prevent scratch & bending

- Custom heavy-duty export packaging for large-diameter bars available upon request

Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on diameter, shape, length, order quantity and custom machining demands.