Stainless Steel Flat Bar
Stainless steel flat steel is a long strip of stainless steel with a rectangular cross-section. It is usually produced by hot rolling, cold rolling or cutting from stainless steel plates, strips or billets.
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Product Introduction

Stainless Steel Flat Bar is a versatile semi-finished product with rectangular cross-section, offering excellent strength, corrosion resistance, and aesthetic appeal for structural, fabrication, and decorative applications across industries. Available in a comprehensive range of grades including 304/304L, 316/316L, 430, 410, and duplex alloys, flat bars provide the fundamental building blocks for frames, supports, brackets, machinery components, and architectural features. Their balanced geometry combines the benefits of sheet metal's surface area with the structural integrity of solid bar stock, making them ideal for applications requiring both load-bearing capability and corrosion resistance.

Manufactured through hot rolling, cold drawing, or precision grinding processes, stainless steel flat bars are characterized by precise dimensional tolerances, straightness, and surface quality. They bridge the gap between plate products (too thick/heavy) and sheet metal (too thin), offering optimal material efficiency for medium-stress applications. From food processing equipment and chemical plant structures to architectural handrails and marine components, flat bars deliver reliable performance while maintaining the hygienic, easy-to-clean surfaces that make stainless steel indispensable in many industries.

Product parameters


Item / Parameter

Specification for Stainless Steel Flat Bar

Notes / Significance

Key Feature

The Versatile Structural and Fabrication Material. Rectangular cross-section provides optimal balance of strength, surface area, and material efficiency for medium-stress applications.

The fundamental building block for frames, supports, brackets, and structural components across industries.

Available Grades

Austenitic: 304/304L, 316/316L, 321, 347
Ferritic: 430, 409, 439, 444
Martensitic: 410, 420, 440C
Duplex: 2205, 2507
Precipitation Hardening: 17-4PH

Full range of stainless steel grades available to match application requirements.

Standard Dimensions

Thickness: 3mm - 100mm
Width: 10mm - 300mm
Length: Standard 6m, custom lengths up to 12m
Common Sizes: 25x3mm, 40x4mm, 50x5mm, 75x6mm, 100x10mm

Comprehensive size range covering most industrial needs.

Dimensional Tolerances

Thickness: ±0.1mm to ±0.5mm (depending on size)
Width: ±0.5mm to ±2.0mm
Straightness: 1-3mm per meter
Squareness: 90° ±0.5° to ±2°
Length: ±3mm to ±10mm

Precision manufacturing ensures consistent dimensions for fabrication.

Manufacturing Processes

Hot Rolling: At elevated temperatures, mill scale surface
Cold Drawing: Cold worked for precise dimensions, bright surface
Precision Grinding: Ground to exact tolerances, superior surface finish
Saw Cutting: From plate material, cost-effective for large sizes

Different processes for different quality and precision requirements.

Surface Finishes

No. 1: Hot rolled, annealed, pickled
No. 2D: Cold rolled, dull finish
No. 2B: Cold rolled, bright finish (most common)
No. 4: Brushed finish
BA: Bright annealed, mirror-like
Polished: Various polish grades (180-600 grit)
Bead Blasted: Matte appearance

Wide range of finishes for functional and aesthetic requirements.

Mechanical Properties

Varies by grade and temper condition
304 Annealed: Rm ≥515 MPa, Rp0.2 ≥205 MPa
304 1/2 Hard: Rm ≥1035 MPa, Rp0.2 ≥760 MPa
316 Annealed: Rm ≥515 MPa, Rp0.2 ≥205 MPa
430 Annealed: Rm ≥450 MPa, Rp0.2 ≥310 MPa

Properties can be tailored through cold working and heat treatment.

Edge Conditions

Square Edges: Standard 90° corners
Rounded Edges: Radius corners for safety
Beveled Edges: Angled for welding preparation
Full Rounded: All corners radiused
Deburred: Sharp edges removed

Edge conditions tailored to application safety and fabrication needs.

Corrosion Resistance

Varies by grade:
304/316: Excellent general corrosion resistance
430: Good for mild environments
Duplex: Superior chloride resistance
Precipitation Hardening: High strength with good corrosion resistance

Grade selection based on environmental exposure and requirements.

Fabrication Capabilities

Cutting: Sawing, shearing, plasma cutting, laser cutting
Bending: Cold bending, press braking, roll forming
Drilling/Tapping: Standard machining operations
Welding: All standard methods applicable
Forming: Good formability in annealed condition

Excellent fabricability for custom component manufacturing.

Key Standards

ASTM A276: Stainless Steel Bars (includes flats)
ASTM A479: Bars for Pressure Vessels
ASTM A484: General Requirements
EN 10088-3: Stainless Steel Bars
JIS G4303: Stainless Steel Bars
ASME SA479: Code Construction

Comprehensive standardization ensures quality and interchangeability.

Common Applications

• Structural Frames: Equipment frames, machinery bases, support structures
• Architectural: Handrails, guardrails, trim, decorative elements
• Food Processing: Equipment frames, conveyor supports, work surfaces
• Marine: Boat fittings, dock hardware, marine structures
• Chemical Processing: Tank supports, platform framing, equipment bases
• Transportation: Vehicle frames, trailer components, cargo securement
• Construction: Building supports, seismic bracing, architectural features

Versatile applications across virtually every industry sector.

Surface selection

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Packaging and transportation

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FACTORY SHOW

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FAQ

Q:What about your price? 
A:Our price is very competitive because we are a factory. Feel free to contact us if you are interested in our products. 

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase. 

Q:Does the product have quality inspection before loading? 
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we
accept the third party inspection absolutely. 

Q:How about the delivery time? 
A:Within 3-15 days after we confirm you requirement. 

Q:What is your terms of payment ?
A:T/T, L/C at sight, Cash, Western Union are all accepted if you have other payment,please contact me. 

Q: Do you provide samples? 
A:Yes,we could offer the sample for you to test but please pay freight fee.

Q:How do we trust your company? 
A:We are a specialized company focusing on global steel trading and supply chain services. Our mission is to provide high-quality, multi-specification, and one-stop steel products and solutions to customers worldwide.

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