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304 Stainless Steel Strip | 0.03–3.0mm | High-Purity Grade

Publish Time: 2026-03-14 14:22:09

When it comes to 304 stainless steel strip, its durability and rust resistance are well-known. But do you know why its composition is so reliable? And how to choose the right thickness for different scenarios? We’ll break it down clearly here — whether you’re purchasing for business or personal use, you’ll be able to select the perfect option after reading this.

304 stainless steel strip has become a versatile "all-rounder" material thanks to its solid composition. Its core elements are chromium and nickel, a "golden combination" for rust resistance: chromium forms a dense oxide film on the surface, like an invisible protective coat that blocks moisture and acid-base corrosion; nickel enhances the material’s toughness and ductility, preventing it from breaking during stretching, compression, or bending.

304 Stainless Steel Strip | 0.03–3.0mm | High-Purity Grade(图1)

Core Specification Table

Item	Detailed Parameters
Thickness Range	0.03–3.0mm
Core Composition	Cr: 18.0%–20.0%, Ni: 8.0%–10.5%
Surface Finishes	2B (matte), BA (bright), brushed, 8K mirror
Mechanical Properties	Tensile strength ≥520MPa, elongation ≥40%
Corrosion Resistance	Salt spray test ≥48 hours without rust

High-quality 304 stainless steel strip also features strict impurity control: carbon content ≤0.08%, and harmful impurities like phosphorus and sulfur ≤0.045% — this prevents localized corrosion caused by excessive impurities. On the contrary, inferior products on the market often reduce nickel content and replace it with manganese. Although they look like 304, they will rust quickly. Therefore, always ask for a material certificate and verify the composition meets standards when purchasing.

Application Scenarios by Thickness

304 stainless steel strip has a wide thickness range, suitable for applications from precision electronics to large-scale equipment. Common usage scenarios are listed below:

Ultra-Thin Strip (0.03–0.1mm)Ideal for mobile phone shielding cases and smart watch straps. The 0.03mm ultra-thin strip can be laser-etched to create complex micro-holes, with an electromagnetic shielding effectiveness of ≥80dB — it’s commonly used as the signal shielding layer inside mobile phones.
Thin Strip (0.1–0.5mm)Widely used in power battery casings and medical surgical instruments. CATL’s battery casings adopt 0.15mm nickel-plated 304 strip, which has 5x better corrosion resistance than galvanized steel and reduces weight by 15%.
Medium-Thin Strip (0.5–1.5mm)The core material for home appliances and food machinery. Air conditioner radiators and refrigerator inner liners use 0.8mm 2B-finish strip, which ensures uniform heat conduction and oil resistance; food filling equipment uses 1.0mm FDA-certified strip, with a smooth surface that resists bacterial adhesion and is easy to clean.
Medium-Thick Strip (1.5–3.0mm)Essential for industrial equipment and building structural parts. New energy bus frames use 2.0mm high-strength 304 strip, with a tensile strength of ≥1100MPa — it reduces weight by 30% compared to traditional carbon steel and has a service life of up to 20 years. It’s also commonly used for equipment protective covers and chemical pipeline gaskets in workshops, thanks to its impact resistance and corrosion resistance.

Common Q&A

Q1: What is the difference between 304 and 304L stainless steel strip? How to choose?

A1: The core difference is carbon content: 304 has ≤0.08% carbon, while 304L has ≤0.03% carbon.

Choose 304L if the product requires welding (e.g., pipelines, equipment frames) — it prevents intergranular corrosion after welding.
Choose 304 for general scenarios — it offers better cost-effectiveness.

Q2: How to identify genuine 304 stainless steel strip?

A2: Three simple methods:

Ask for an SGS or spectral analysis report and check if the chromium and nickel content fall within the standard range.
Test with a magnet — genuine 304 is almost non-magnetic; strong magnetism indicates it’s likely 201 stainless steel passed off as 304.
Inspect the surface — scratch the outer layer; genuine 304 is silvery white throughout, with no delamination or blackening.

Q3: Can 304 stainless steel strip be used outdoors? Will it rust?

A3: Absolutely! It can withstand outdoor humid environments, passing the 48-hour salt spray test without rust. For coastal areas (high chloride ion content), it’s recommended to choose 316L (more corrosion-resistant) or apply nickel plating/painting to the surface to extend service life.

Q4: What are the different uses of 304 stainless steel strip with various surface finishes?

A4:

2B finish: Matte grayish-white, suitable for industrial equipment and pipelines — cost-effective.
BA finish: Bright and flat, commonly used for home appliance panels and decorative parts.
Brushed finish: Uniform texture, scratch-resistant — ideal for elevator panels and kitchen utensils.
8K mirror finish: High reflectivity, strong decorative effect, but prone to fingerprints — requires regular maintenance.

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