Stainless Steel Round Bar

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies stainless steel round bar for machining, shafts, fasteners, valves, pumps, pressure equipment, marine components and industrial fabrication.

Available production routes include hot rolling, forging, cold drawing, peeling, centerless grinding and polishing. Bars can be supplied in standard mill lengths or cut to the exact length required by the customer.

We supply commonly requested austenitic, martensitic, precipitation-hardening and duplex stainless steel grades, including:

• 303
• 304 and 304L
• 316 and 316L
• 321 and 347
• 410, 420 and 431
• 17-4PH
• Duplex 2205
• Super Duplex 2507

Each order can be reviewed according to the required grade, diameter, tolerance, surface condition, heat treatment, machining allowance and end application.

The final available diameter, tolerance and surface condition depend on the selected grade, production route and order quantity.

Stainless steel round bar is a solid cylindrical metal product manufactured by hot rolling, forging, cold drawing, peeling or grinding.

Compared with stainless steel pipe, round bar has a completely solid cross-section. It is commonly machined or fabricated into:

• Shafts
• Pins
• Bushings
• Bolts and fasteners
• Valve stems
• Pump shafts
• Couplings
• Flanges
• Fittings
• Rollers
• Machine components
• Marine hardware

The correct stainless steel grade should be selected according to corrosion conditions, mechanical loading, machining requirements, welding procedures, operating temperature and applicable design standards.

304 stainless steel round bar is a general-purpose austenitic stainless steel grade with good corrosion resistance, formability and fabrication performance.

Typical applications include:

• Food processing equipment
• General machinery
• Architectural components
• Water handling equipment
• Fasteners
• Shafts and pins
• Chemical equipment under moderate conditions

304 is suitable for many atmospheric and industrial environments, but it is not the preferred choice for severe chloride exposure.

304L has a lower carbon content than standard 304. The reduced carbon level helps limit chromium carbide precipitation during welding.

304L round bar is commonly selected for:

• Welded components
• Chemical equipment
• Food processing machinery
• Water treatment systems
• Fabricated structures
• Components requiring improved resistance to weld-related sensitization

XRF PMI can help identify the alloy family, but it cannot independently confirm the low-carbon difference between 304 and 304L. Carbon verification should be based on heat analysis, an EN 10204 3.1 certificate or suitable OES testing.

316 stainless steel contains molybdenum, providing improved resistance to pitting and crevice corrosion compared with 304 in many chloride-containing environments.

Typical applications include:

• Marine equipment
• Chemical processing components
• Pharmaceutical equipment
• Pumps and valves
• Coastal installations
• Heat exchanger components
• Food processing machinery

316 should not automatically be described as fully resistant to seawater. Warm, stagnant or highly concentrated chloride conditions may require duplex, super duplex or another corrosion-resistant alloy.

316L combines molybdenum alloying with a controlled low-carbon composition. It is widely used for machined and welded components requiring improved corrosion resistance.

Common applications include:

• Valve stems
• Pump shafts
• Pharmaceutical equipment
• Chemical processing systems
• Marine hardware
• Food processing equipment
• Water treatment components

For welded pressure components, the material standard, welding procedure, design code and post-weld requirements must be confirmed before ordering.

303 stainless steel is a free-machining austenitic grade developed for improved machining performance.

It is suitable for:

• CNC-machined parts
• Bushings
• Fittings
• Nuts and bolts
• Instrument components
• High-volume turned parts

The sulfur addition that improves machinability also reduces corrosion resistance and welding performance compared with 304. Grade 303 should therefore be selected carefully for corrosive or welded applications.

321 and 347 are stabilized austenitic stainless steels.

• 321 is stabilized with titanium.
• 347 is stabilized with niobium or columbium.

These grades are often selected for components exposed to elevated temperatures or welding conditions where resistance to sensitization is important.

Typical applications include:

• High-temperature equipment
• Exhaust components
• Refinery equipment
• Thermal processing systems
• Power generation components
• Welded industrial parts

The stabilized grade alone does not determine allowable operating temperature or pressure. The product standard, mechanical properties, heat treatment and applicable design code must also be reviewed.

410 is a martensitic stainless steel grade that can be heat treated to obtain higher strength and hardness than common austenitic grades.

Typical applications include:

• Valve components
• Pump shafts
• Fasteners
• Machine parts
• Industrial blades
• Wear-resistant components

Corrosion resistance is lower than 304 and 316. Final mechanical properties depend strongly on the heat-treatment condition.

420 stainless steel can achieve relatively high hardness after suitable heat treatment.

It is commonly used for:

• Cutting tools
• Surgical instruments
• Molds
• Shafts
• Wear components
• Mechanical parts
• Industrial knives

The customer should specify the required hardness, heat-treatment condition and machining allowance before production.

431 is a high-chromium, nickel-containing martensitic stainless steel with a combination of strength, toughness and corrosion resistance.

Typical applications include:

• Marine shafts
• Pump shafts
• Bolts
• Fasteners
• Aircraft components
• High-strength machine parts

Hardness and mechanical properties must be matched to the required heat-treatment condition.

17-4PH is a precipitation-hardening stainless steel grade offering high strength, good dimensional stability and moderate corrosion resistance.

Common supply conditions include:

• Condition A
• H900
• H1025
• H1075
• H1100
• H1150

Typical applications include:

• Aerospace components
• Valve stems
• Pump shafts
• Fasteners
• Oil and gas equipment
• High-strength machine parts

Condition A is normally supplied for further aging treatment and should not automatically be treated as the final service condition. The required aging condition and mechanical properties must be specified on the purchase order.

Duplex 2205 combines austenitic and ferritic microstructures. It provides higher strength than common 300-series stainless steels and improved resistance to chloride stress-corrosion cracking in many environments.

Typical applications include:

• Chemical processing equipment
• Desalination systems
• Marine components
• Pulp and paper equipment
• Oil and gas components
• Pressure equipment
• Shafts and fasteners

Welding and heat treatment must be controlled to maintain the required phase balance and corrosion performance.

Super Duplex 2507 is selected for more severe chloride-containing environments requiring high strength and improved resistance to pitting, crevice corrosion and stress-corrosion cracking.

Typical applications include:

• Offshore equipment
• Seawater handling systems
• Desalination plants
• Chemical processing
• Oil and gas production
• High-pressure piping components

For critical applications, customers should specify the required product standard, heat-treatment condition, corrosion testing, ferrite control, hardness limits and inspection documents.

Material selection should be based on actual operating conditions rather than grade name alone.

Hot-rolled stainless steel round bar is normally selected for larger diameters, general fabrication and applications requiring subsequent machining.

Characteristics include:

• Economical production route
• Suitable for larger diameters
• Visible mill scale or pickled surface
• Larger dimensional tolerance than ground bar
• Machining allowance normally required

Forged stainless steel bar is used for large diameters, heavy-duty parts and components requiring controlled mechanical properties.

Forged bars may be supplied with:

• Black forged surface
• Rough-machined surface
• Peeled surface
• UT inspection
• Heat-treatment records
• Custom machining allowance

Cold drawing improves dimensional control, surface appearance and straightness.

Cold-drawn stainless steel round bar is commonly used for:

• Precision machining
• Automatic lathes
• Fasteners
• Instrument parts
• Small shafts
• High-volume CNC components

Cold working may increase strength and hardness. The customer should confirm whether annealed or cold-worked properties are required.

Peeling removes surface scale and defects from hot-rolled or forged bar.

Advantages include:

• Cleaner metallic surface
• Improved dimensional consistency
• Reduced surface defects
• Controlled machining allowance
• Better preparation for grinding or machining

Centerless grinding provides tighter diameter tolerance, improved roundness and a smooth surface.

Typical applications include:

• Pump shafts
• Valve stems
• Hydraulic components
• Precision machine parts
• Bearing-related parts
• Automated machining lines

Requested tolerance classes such as h9, h10 or h11 must be confirmed according to diameter, grade and production condition.

Polished stainless round bar is available for decorative, hygienic and visible applications.

Available finishes may include:

• Mechanical polished
• Satin finish
• Fine-ground finish
• Bright polished
• Custom roughness after review

A polished visual appearance does not automatically mean the surface meets sanitary roughness requirements. Required Ra values and measurement methods must be clearly stated.

Stainless steel round bars can be supplied according to the following commonly requested standards:

ASTM A276 and ASTM A479 should not be treated as interchangeable without reviewing the intended application. Pressure equipment may require ASTM A479, additional testing or compliance with a specific design code.

Diameter tolerance can be supplied according to:

• ASTM A484
• EN standard tolerance classes
• h9, h10 or h11 requirements
• Customer drawings
• Machining allowance requirements

Before ordering precision round bar, please specify:

1. Nominal diameter
2. Required tolerance
3. Roundness requirement
4. Straightness requirement
5. Surface condition
6. Final machining process
7. Inspection method

“Tight tolerance" should not be used as the only purchase description. The exact numerical tolerance must be stated.

We can arrange processing according to the purchase order or drawing.

• Saw cutting
• Precision length cutting
• Chamfering
• End facing
• Centerless grinding
• Peeling
• Polishing
• Drilling
• Turning
• CNC machining
• Threading
• Heat treatment
• Marking and labeling

For machined parts, customers should send a drawing showing:

• Material grade
• Dimensions
• Tolerance
• Surface roughness
• Heat-treatment condition
• Thread standard
• Inspection requirements
• Annual quantity

Chemical composition is verified through the material certificate and, when required, additional testing.

XRF PMI is useful for identifying major alloying elements such as chromium, nickel and molybdenum.

However, handheld XRF generally cannot accurately measure carbon. Therefore, XRF PMI alone cannot independently distinguish:

• 304 from 304L
• 316 from 316L
• Standard carbon from low-carbon grades
• H-grade carbon requirements

Low-carbon and high-carbon grade confirmation should be based on:

• Original heat analysis
• EN 10204 3.1 material certificate
• Optical emission spectroscopy
• Laboratory chemical analysis

Inspection can be arranged according to the grade, standard and application.

• Visual inspection
• Diameter measurement
• Length inspection
• Straightness check
• Surface inspection
• Quantity and weight verification
• Heat number traceability
• Material certificate review

• Handheld PMI
• OES chemical analysis
• Ultrasonic testing
• Hardness testing
• Tensile testing
• Impact testing
• Intergranular corrosion testing
• Ferrite measurement
• Surface roughness measurement
• Third-party inspection

Testing requirements must be confirmed before production because test method, specimen orientation, acceptance criteria and sampling frequency can affect the quotation.

Mechanical properties depend on:

• Stainless steel grade
• Bar diameter
• Product standard
• Hot-rolled or cold-worked condition
• Solution-annealed condition
• Quenched and tempered condition
• Precipitation-hardening condition
• Test specimen orientation

A single generic strength value should not be applied to every bar diameter and condition.

For 410, 420, 431 and 17-4PH round bars, the required heat-treatment condition must be included in the purchase order.

• CNC-machined parts
• Bushings
• Pins
• Couplings
• Rollers
• Machine components
• Precision instruments

• Pump shafts
• Valve stems
• Valve components
• Seats
• Fasteners
• Pressure equipment parts

• Mixer shafts
• Processing machine parts
• Hygienic equipment components
• Filling machine parts
• Packaging equipment parts

• Marine fasteners
• Shafts
• Desalination equipment
• Water treatment components
• Pump and valve parts

Grade selection must reflect actual chloride concentration, temperature, flow condition and maintenance environment.

• Valve stems
• Fasteners
• Instrument components
• Chemical equipment
• Pressure equipment parts
• Offshore components

For sour-service applications, NACE or ISO 15156 compliance should only be claimed when the exact grade, condition, hardness and certification requirements have been confirmed.

• Railings
• Structural connectors
• Decorative rods
• Architectural components
• Support systems
• Custom metalwork

We supply austenitic, martensitic, precipitation-hardening and duplex stainless steel round bars for different industrial applications.

Diameter, length, surface condition, tolerance and machining services can be matched to drawings and procurement specifications.

Bars can be supplied with heat numbers and EN 10204 3.1 inspection documents for material verification.

We help customers compare corrosion resistance, machinability, welding requirements, heat-treatment condition and cost before confirming the order.

Round bars can be packed in bundles, waterproof wrapping, wooden cases or reinforced steel frames for international transportation.

Available packing methods include:

• Steel-strapped bundles
• Waterproof paper wrapping
• Plastic film protection
• Wooden cases
• Fumigated wooden cases
• Steel frames
• End protection
• Heat-number labels
• Custom shipping marks

Precision-ground and polished bars can be individually protected to reduce scratching and surface damage during transportation.

Packing should be selected according to:

• Bar diameter
• Bar length
• Surface condition
• Shipment weight
• Loading method
• Destination port
• Customer handling requirements

To receive an accurate quotation, please provide:

• Stainless steel grade
• Required standard
• Diameter
• Diameter tolerance
• Length
• Quantity or total weight
• Surface condition
• Heat-treatment condition
• Straightness requirement
• End processing
• Inspection document
• Additional testing
• Final application
• Destination port

For machined products, please attach a technical drawing in PDF, DWG or STEP format.

Common grades include 303, 304, 304L, 316, 316L, 321, 347, 410, 420, 431, 17-4PH, Duplex 2205 and Super Duplex 2507. Other grades can be reviewed according to the required standard.

Hot-rolled bar is generally more economical and suitable for larger diameters or subsequent machining. Cold-drawn bar offers better dimensional control, straightness and surface appearance.

Yes. Centerless-ground bars can be supplied with controlled diameter tolerance, roundness and straightness. The required numerical tolerance must be specified.

Yes. Saw cutting, precision cutting, chamfering, facing and machining can be arranged according to the drawing or purchase order.

Handheld XRF PMI can identify major alloying elements but normally cannot verify carbon content. Confirmation of 304L or 316L should rely on heat analysis, an EN 10204 3.1 certificate or suitable OES testing.

316L performs better than 304 in many chloride environments, but it is not immune to pitting or crevice corrosion. Warm, stagnant or highly concentrated seawater conditions may require Duplex 2205, Super Duplex 2507 or another alloy.

Yes, subject to diameter and production availability. The required aging condition and mechanical properties should be specified before ordering.

Third-party inspection can be arranged for chemical composition, dimensions, mechanical testing, UT, hardness, material traceability and packing verification.

Please specify the grade, diameter, tolerance, straightness, surface roughness, heat-treatment condition, final machining process and inspection requirements.

Stainless steel round bars can be supplied with EN 10204 3.1 inspection documents. Additional testing or third-party certification should be confirmed at the quotation stage.

Looking for stainless steel round bar for machining, pumps, valves, fasteners, pressure equipment or marine components?

Send us your required:

• Grade
• Standard
• Diameter
• Length
• Tolerance
• Surface
• Quantity
• Inspection requirements
• Destination port

Our team will review the technical requirements and provide a suitable material and processing proposal.

Shaanxi Shangyou Stainless Steel Co., Ltd.

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