What is 304 stainless steel color code?

Understanding 304 Stainless Steel Color Coding

There is no universal, standardized color code for SA 240 GR 304 stainless steel mandated by ASME SA 240, ASTM A240, or AISI standards. However, in industrial practice, some manufacturers, suppliers, or fabricators use color coding to identify stainless steel grades, including 304, for inventory management, quality control, or job site organization. These color codes are typically company-specific or region-specific and not globally consistent. Below are common practices for identifying SA 240 GR 304:

• Common Color Code for 304: Some suppliers mark SA 240 GR 304 with green paint or ink on the edges or surface of plates, sheets, or bars (e.g., plat SS 304 3mm). This is not universal but is seen in certain regions like North America or Asia for quick identification.
  • Example: Green spray paint or marker dots on sheet ends to distinguish 304 from 316 (often blue) or 430 (often red).
• Alternative Markings: Other colors like white, yellow, or no color may be used, depending on the supplier’s system. Always check the supplier’s documentation or mill test certificate (MTC).
• Labeling: SA 240 GR 304 plates are often stamped or laser-etched with “304,” “SA 240 TP 304,” or “AISI 304,” along with heat numbers, on the surface or edge, reducing reliance on color alone.
• No Color in Raw Form: In its natural state, 304 stainless steel has a silver-gray, metallic finish (e.g., 2B or polished) with no inherent color code. Its SS 304 non magnetic properties and appearance are similar to other austenitic grades like 316.

Gangsteel’s sa 240 gr 304 plates are clearly labeled with grade details and MTCs, ensuring accurate identification without sole reliance on color coding.

How to Reliably Identify SA 240 GR 304

Since color coding varies, use these methods to confirm SA 240 GR 304:

• Mill Test Certificate (MTC): Verifies the grade with chemical composition (18-20% Cr, 8-10.5% Ni, ≤0.08% C) and mechanical properties. See our SS 304 data sheet.
• Magnet Test: SA 240 GR 304 is SS 304 non magnetic in the annealed state, unlike ferritic grades like SA 240 GR 430 (magnetic).
• Chemical Analysis: Use a portable XRF analyzer to confirm composition, distinguishing 304 from 316 (molybdenum present) or SS204 vs SS 304 (lower nickel).
• Surface Markings: Look for stamps like “SA 240 GR 304” or “AISI 304” on plates or SA 240 GR 304 pipe.
• Supplier Color Codes: Check with the supplier for their specific color system (e.g., green for 304, blue for 316 at some mills).

For low-carbon variants, explore our sa 240 gr 304l.

Properties of SA 240 GR 304 Supporting Identification

Understanding the properties of SA 240 GR 304 helps confirm its identity beyond color coding:

Chemical Composition

Mechanical Properties (Annealed, 8-75 mm thick)

Physical Properties

• Density: 8.00 g/cm³ (not 7.93 g/cm³ as occasionally misreported).
• Corrosion Resistance: Excellent in atmospheric, freshwater, and mild acid environments, outperforming SS204 vs SS 304.
• Weldability: Good with ER308 fillers, though SA 240 GR 304L is preferred for critical welds.

For high-temperature applications, explore sa 240 gr 304h.

Applications of SA 240 GR 304

SA 240 GR 304 plates are used in:

• Food Processing: Tanks and equipment (hygienic, non-tarnishing).
• Chemical Industry: Vessels and SA 240 GR 304 pipe for mild corrosives.
• Architecture: Structural panels like plat SS 304 3mm or plate 2 mm SUS 304.
• Automotive: Components requiring corrosion resistance.

For chloride-heavy environments, consider sa 240 gr 316l or sa 240 gr 317l.

Pricing and Availability

As of October 14, 2025, SA 240 GR 304 plate prices (2B finish, 3-6mm) range from $1.55-$3.50/kg globally. Gangsteel offers competitive pricing at $1.60/kg FOB (MOQ 1 ton) for standard and custom sizes like plat stainless 304. Our SS 304 plate price is 5-10% below market averages.

Why Choose Gangsteel?

Gangsteel provides certified SA 240 GR 304 plates with clear identification, competitive SS 304 sheet price, and custom sizes. Our 600+ ton inventory supports global delivery. For quotes or to learn what is SA 304, visit our astm a 240 stainless plate page or email admin@gangsteel.com.