LIANYUNGANG DAPU METAL CO.LTD
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ASTM A276 / A484 STANDARDS

304 Stainless Steel
Flat Bar.

Premium SS304 flat stock available in Cold Drawn for high-precision applications or HRAP for robust industrial use. Engineered for durability and superior corrosion resistance.

Grade 304 / 304L
Thickness 1/8" - 1"
Process CD & HRAP
Get a Fast Quote Specifications Chart
Cold drawn 304 flat bar with sharp edges
Precision CD
HRAP 304 flat bar with matte finish
Industrial HRAP

The 304/304L Advantage

As the most versatile stainless steel grade, Type 304 provides excellent weldability and formability. Our flat bars are typically dual-certified as 304/304L, ensuring low carbon content for superior corrosion resistance after welding.

Key Specifications:
• ASTM A276 (Standard Spec)
• ASTM A484 (General Requirements)
• Non-Magnetic (Annealed state)
Cold Drawn (CD) High Precision

Processed at room temperature to achieve superior dimensional accuracy and a bright, smooth surface.

  • Sharp, defined 90-degree corners
  • Bright, reflective "metallic" finish
  • Tighter thickness & width tolerances
  • Increased tensile strength from cold working
Best for: Architectural trim, machinery parts, and decorative brackets.
HRAP Industrial Grade

Hot Rolled, Annealed, and Pickled. This process removes scale and restores corrosion resistance after rolling.

  • Slightly rounded "mill" edges
  • Dull, matte gray (pickled) finish
  • Economical choice for structural use
  • Stress-relieved via annealing
Best for: Support structures, industrial frames, and marine hardware.
Dimensional Data

Size & Weight Matrix

Theoretical weights for SS304 flat bars. Standard lengths available in 12' and 20' R/L.

Thickness (in) 1/2" Width 3/4" Width 1" Width 1-1/2" Width 2" Width 3" Width
1/8" (0.125) 0.213 lb/ft 0.319 lb/ft 0.425 lb/ft 0.638 lb/ft 0.850 lb/ft 1.275 lb/ft
3/16" (0.1875) 0.319 lb/ft 0.478 lb/ft 0.638 lb/ft 0.956 lb/ft 1.275 lb/ft 1.913 lb/ft
1/4" (0.250) 0.425 lb/ft 0.638 lb/ft 0.850 lb/ft 1.275 lb/ft 1.700 lb/ft 2.550 lb/ft
3/8" (0.375) 0.638 lb/ft 0.956 lb/ft 1.275 lb/ft 1.913 lb/ft 2.550 lb/ft 3.825 lb/ft
1/2" (0.500) 0.850 lb/ft 1.275 lb/ft 1.700 lb/ft 2.550 lb/ft 3.400 lb/ft 5.100 lb/ft

How to calculate?

Use this simple formula for custom stainless flat bar sizes:

Thickness × Width × 3.40 = Weight (lb/ft)
Precision Processing

Precision Cut-to-Length Solutions

Eliminate secondary operations at your facility. Our high-capacity sawing center delivers exact lengths with clean, industrial-grade finishes.

Automatic Band Sawing

Optimized for bundle cutting of 304 bars, ensuring consistent length across entire batches.

Surface Protection

Careful handling procedures to prevent marring on cold drawn (CD) finishes during the cutting process.

Ready-to-Ship Inventory

Rapid fulfillment on cut-to-size requests for standard 304 and 304L specifications.

Precision band saw cutting a stack of stainless steel bars
Tolerance: ± 0.0625" (1/16")
Versatile Utility

Where SS304 Flat Bar Performs

From high-hygiene food processing to modern urban architecture, the balance of strength and corrosion resistance makes 304 the go-to alloy for critical infrastructure.

Stainless steel flat bar used in modern staircase railing
Architecture

Ornamental Framework

Utilizing the sharp edges of Cold Drawn bars for modern handrails, luxury furniture frames, and high-end storefront trim.

Food grade processing table with stainless steel supports
Hygienic Engineering

Food & Medical Support

Dual-certified 304/304L flat bars are ideal for equipment stands and supports that require frequent chemical sanitization.

Heavy duty HRAP flat bar brackets in industrial setting
Infrastructure

Structural Brackets

HRAP bars provide the necessary structural integrity for tank reinforcement, cable tray supports, and marine-grade mounting hardware.

Knowledge Base

Technical Insights

In its fully annealed state, 304 stainless steel is non-magnetic. However, during the Cold Drawing process, the crystalline structure can undergo a partial transformation into martensite, which may cause the flat bar to exhibit a slight magnetic pull. This does not affect its corrosion resistance.
The "L" in 304L stands for "Low Carbon" (0.03% max vs 0.08%). This reduces the risk of carbide precipitation during welding, making 304L superior for heavy-gauge welded structures. Most of our inventory is dual-certified, meeting the requirements of both grades simultaneously.
Cold Drawn bars follow tighter tolerances (typically h11 or h12) for thickness and width, providing a "true-to-size" fit. HRAP bars follow ASTM A484 standards, which allow for slightly larger deviations and a "mill edge" rather than a precision sharp corner.
304 has good machinability but tends to work-harden. When drilling 304 flat bars, we recommend using cobalt drill bits with constant pressure and slow speeds. For high-volume machining projects, Cold Drawn bars are preferred due to their consistent grain structure.