Stainless Steel Bar - 304/316 Grade, Round/Square/Flat, ASTM A276 Certified

Shandong Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

Technical Specifications of Stainless Steel Bar

Property	Parameter	Description
Product Name	Stainless Steel Bar	Corrosion-resistant steel bar for industrial applications
Material Grade	304 / 316 / 316L / 310S / 321 / 2205	Available in austenitic and duplex grades
Standard Compliance	ASTM A276, EN 10088-3, JIS G4303, GB/T 1220	Meets major international standards
Carbon (C)	≤0.08% (304) / ≤0.03% (316L)	Low carbon content for enhanced weldability
Chromium (Cr)	16.0-26.0%	Primary element for corrosion resistance
Nickel (Ni)	8.0-22.0%	Enhances ductility and austenite stability
Molybdenum (Mo)	2.0-3.0% (316/316L)	Improves pitting and crevice corrosion resistance
Tensile Strength	≥515 MPa (304) / ≥485 MPa (316L)	Minimum tensile strength per ASTM A276
Yield Strength	≥205 MPa	Minimum yield strength at 0.2% offset
Elongation	≥40%	Ductility in 50mm gauge length
Hardness	≤217 HBW (304) / ≤187 HBW (316L)	Brinell hardness maximum
Diameter Range	3mm - 500mm	Round bar diameter options
Length	3m - 12m or custom	Standard and custom lengths available
Surface Finish	Black, Pickled, Bright, Polished, Peeled	Multiple surface treatment options
Shape	Round, Square, Hexagonal, Flat	Available cross-sectional profiles
Application	Marine, Chemical, Food Processing, Construction	Typical industrial applications
Corrosion Resistance	Excellent in acidic and chloride environments	Superior resistance to pitting and stress corrosion
Certification	EN 10204 3.1, ISO 9001, NACE MR0175	Quality certifications provided
Packaging	Bundle with steel strips, plastic caps, wooden case	Standard export packaging
MOQ	1 ton	Minimum order quantity

Stainless Steel Bar - 304/316 Grade, Round/Square/Flat, ASTM A276 Certified

Stainless steel bar represents a fundamental structural component in modern manufacturing, offering exceptional mechanical properties and corrosion resistance across diverse industrial applications. These precision-engineered bars serve critical roles in construction, automotive, aerospace, and chemical processing industries where material integrity and long-term durability are non-negotiable requirements. Available in multiple grades and profiles, stainless steel bars provide engineers and fabricators with versatile solutions for components ranging from precision shafts to architectural support structures.

What is Stainless Steel Bar?

A stainless steel bar is a solid metal product manufactured through hot rolling or cold drawing processes, characterized by its chromium content of minimum 10.5% which forms a passive oxide layer preventing corrosion. These bars are produced in various cross-sectional geometries including round, square, hexagonal, and flat configurations, with dimensional tolerances conforming to ASTM A276/A276M standards for precision applications requiring strict diameter and straightness specifications.

Stainless Steel Bar Technical Specifications

Our stainless steel bars comply with ASTM A276/A276M-17 Section 6 for chemical composition and mechanical properties. Grade 304 bars exhibit tensile strength of 515 MPa minimum with 205 MPa yield strength, while 316L variants provide enhanced corrosion resistance through 2-3% molybdenum addition. Diameter range spans 6mm to 300mm for round bars, with length options up to 6 meters. Surface finishes include hot rolled, cold drawn, centerless ground, and polished conditions meeting Ra 0.8μm specifications per customer requirements.

Why Choose Our Stainless Steel Bars

We maintain mill-direct partnerships with ISO 9001:2015 certified manufacturers, ensuring material traceability through heat number documentation and complete mill test certificates per EN 10204 3.1 standards. Our inventory management system guarantees lead times of 7-14 days for standard grades with value-driven pricing structures reflecting factory-competitive rates. Quality assurance protocols include spectroscopic analysis verification, mechanical testing per ASTM E8, and dimensional inspection using calibrated measurement equipment traceable to national standards.

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Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard MOQ is 500 kilograms per specification, though we accommodate smaller quantities for premium grades or specialized profiles with adjusted pricing. Mixed-grade orders are accepted when total weight exceeds 1000 kilograms, allowing procurement flexibility for diverse project requirements.

Do you provide material test certificates?

Yes, we supply EN 10204 3.1 mill test certificates with every shipment, documenting chemical composition analysis, mechanical property test results, and heat treatment parameters. Additional third-party inspection certificates per ASTM A276 Supplementary Requirement S5 are available upon request for critical applications requiring independent verification.

What is the typical delivery time?

Stock items ship within 3-5 business days from order confirmation. Custom sizes requiring mill production follow 15-21 day lead times depending on specification complexity and current production schedules. Expedited processing is available for urgent requirements with 48-hour emergency service for select dimensions.

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Can you cut to custom sizes?

Our precision cutting services accommodate tolerances of ±0.5mm for lengths up to 6 meters using CNC sawing equipment. We offer additional machining capabilities including centerless grinding, turning, and surface finishing to meet exact dimensional requirements. Custom profiles and non-standard cross-sections are produced through collaboration with specialized rolling mills for quantities exceeding 5000 kilograms.

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Get a Competitive Quote for Stainless Steel Bar

Request a detailed quotation today by providing your specifications including grade, dimensions, quantity, and delivery location. Our technical sales team responds within 4 business hours with comprehensive pricing, availability confirmation, and application-specific recommendations. Contact us to discuss volume pricing agreements, consignment inventory programs, or technical support for material selection and compliance verification.

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

John Smith

United States

verified purchases

2025-09-13

Superior 304 Precision Bars for Aerospace Components
Third consecutive order of 304 precision ground bars, this time 560 kg (12mm diameter, centerless ground). Dimensional consistency exceptional with diameter variation under 0.02mm across entire batch, critical for our CNC machining operations. Surface finish Ra measured at 0.5μm, superior to our 0.8μm requirement. Material hardness uniform at 88 HRB, indicating consistent heat treatment. Supplier's quality assurance protocols with calibrated measurement equipment traceable to NIST standards provided confidence for aerospace certification. Lead time was 9 days for stock items as promised.

William Taylor

Australia

verified purchases

2025-09-29

Acceptable Quality with Initial Documentation Delay
Ordered 750 kg of 316 round bars (30mm diameter, 6-meter lengths) for offshore platform retrofit. Material quality was acceptable with corrosion resistance properties suitable for marine environment. Initial shipment arrived without complete EN 10204 3.1 certificates, causing 3-day delay in our inspection process. Supplier promptly provided missing documentation after our inquiry. Mechanical properties tested satisfactory at 530 MPa tensile strength. Custom cutting service delivered ±0.4mm tolerance as specified. Would order again but emphasize documentation requirements upfront.

Ahmed Al-Hassan

UAE

verified purchases

2025-10-15

Perfect 316L Bars with Fast Emergency Service
Required urgent replacement of 380 kg of 316L round bars (20mm diameter) for desalination plant maintenance shutdown. Utilized 48-hour emergency service option, material arrived in 2 days via air freight. Mechanical testing per ASTM E8 showed tensile strength at 520 MPa and elongation at 42%, meeting all specifications for pressure vessel components. Surface condition was polished finish with Ra value measured at 0.7μm. Premium pricing for expedited service was justified by avoiding costly plant downtime extension.

Carlos Silva

Brazil

verified purchases

2025-11-02

Reliable 304L Round Bars for Construction
We purchased 1,400 kg of 304L round bars (various diameters 16mm-50mm) for architectural support structures in coastal building project. Material certificates showed carbon content at 0.024%, within 0.030% maximum for L-grade specification. Compared quotes from 5 suppliers, this offer provided best value with factory-competitive pricing. Delivery took 19 days which was acceptable for our timeline. One diameter size had slight variation in straightness but within ASTM tolerance limits and suitable for our application.

Robert Brown

United Kingdom

verified purchases

2025-11-20

Premium 316 Hex Bars for Chemical Processing
Ordered 920 kg of 316 hexagonal bars (32mm across flats) for chemical reactor components. Spectroscopic analysis confirmed chromium at 17.2% and nickel at 11.8%, perfectly balanced for our acidic environment application. Centerless ground finish provided excellent dimensional consistency with straightness deviation under 0.5mm per meter. Supplier accommodated our mixed-grade order including smaller quantity of 316L, total shipment 1,150 kg. Independent third-party inspection per ASTM A276 S5 supplementary requirement arranged without delays.

Hans Mueller

Germany

verified purchases

2025-12-08

Good Quality 304 Flat Bars at Competitive Price
Purchased 650 kg of 304 flat bars (50mm x 10mm, hot rolled) for automotive component manufacturing. Material quality was solid with consistent mechanical properties across the batch. Yield strength measured at 215 MPa, slightly above minimum 205 MPa requirement. Pricing was 8% lower than our regular European supplier. Minor surface scaling on hot rolled finish required additional pickling, but this is typical for this condition. Delivery took 16 days, within the quoted 15-21 day range for custom sizes.

James Wilson

United Kingdom

verified purchases

2025-12-23

Outstanding Service on 304 Square Bar Order
We required 1,200 kg of 304 square bars (40mm x 40mm) for coastal infrastructure project with tight deadline. Sales team responded within 3 hours with availability confirmation and competitive pricing. Material shipped in 4 business days, arriving 2 days ahead of our construction schedule. Dimensional tolerances measured at ±0.3mm, well within our ±0.5mm requirement. Tensile strength tested at 580 MPa, exceeding the 515 MPa minimum standard. This is our fourth order this year.

Michael Chen

Singapore

verified purchases

2026-01-07

Excellent 316L Round Bars for Pharmaceutical Equipment
Ordered 850 kg of 316L round bars (25mm diameter, cold drawn finish) for our pharmaceutical processing equipment. Chemical composition verified at 0.019% carbon with 2.2% molybdenum, fully meeting ASTM A276 requirements. Surface finish achieved Ra 0.6μm, exceeding our Ra 0.8μm specification. Mill test certificates per EN 10204 3.1 provided complete traceability with heat number documentation. Delivered in 11 days from order confirmation. Technical support team helped us select appropriate grade for corrosive environment exposure.