Natural Color Stainless Steel Plate No4 Surface Finish ASTM SA240M 304L 316L 321 for Industrial Applications
2026/08/12
We are proud to introduce our comprehensive range of natural color stainless steel plates with premium No.4 surface finish, fully compliant with ASTM SA240M standards. Available across multiple grades including 304L, 316L, 321, 304, 201, 202, and 316Ti, these plates are engineered to meet the most demanding requirements across food processing, medical, construction, chemical, automotive, and marine industries worldwide.
At the core of our offering is 304L stainless steel, a versatile low-carbon variant prized for its exceptional weldability and resistance to intergranular corrosion. With a carbon content of ≤0.03%, 304L effectively minimizes carbide precipitation during welding, making it the preferred choice for applications where post-weld annealing is impractical. Its austenitic structure, composed of 18-20% chromium and 8-12% nickel, ensures stable corrosion resistance and outstanding formability across a broad range of environments.
| Property | 304L Specification |
|---|---|
| Tensile Strength | 515 — 564 MPa (75,000 — 81,800 psi) |
| Yield Strength (0.2% offset) | ≥170 MPa (24,660 psi) |
| Elongation | ≥40% — enabling deep drawing and complex forming |
| Hardness | HB ≤187, HRB ≤90 |
| Density | 8.03 g/cm³ (0.289 lbs/in³) |
| Thermal Conductivity | 16.2 — 16.3 W/m·K at 100°C |
| Magnetic Permeability | Nearly non-magnetic in annealed state |
Our No.4 surface finish provides a refined matte appearance with light polishing, making it the ideal choice for architectural trim and industrial applications where aesthetics and functionality converge. We also offer a complete range of additional finishes to suit every application:
- 2B — Smooth, reflective finish for general industrial purposes
- BA (Bright Annealed) — Mirror-like surface for decorative and high-visibility applications
- No.4 — Matte finish with consistent linear grain, ideal for architectural trim and food equipment
- HL (Hairline) — Brushed texture offering enhanced scratch resistance and ease of cleaning
- Embossed — Textured surfaces for anti-slip grip and decorative aesthetics
| Grade | Key Advantage | Recommended Applications |
|---|---|---|
| 304L | Superior weldability, general corrosion resistance | Food & beverage, medical, construction |
| 316L | Enhanced chloride resistance (2-3% Mo) | Marine, chemical processing, coastal structures |
| 321 | Titanium-stabilized for high-temperature service | Aerospace, heat exchangers, exhaust systems |
| 316Ti | Titanium-stabilized variant of 316 | High-temperature corrosive environments |
| 201 / 202 | Cost-effective, lower nickel content | Interior decoration, light industrial use |
Our plates are optimized for a wide range of fabrication processes. TIG (Tungsten Inert Gas) welding is the preferred technique, offering precise heat control and superior bead quality — especially when paired with pulsed current to minimize residual stress. We recommend using 308L or 309L filler materials to perfectly match the low-carbon content and maintain corrosion resistance at weld joints. While post-weld annealing is generally unnecessary, treatment at 1050-1100°C followed by rapid cooling can restore full ductility after heavy cold working when required.
For customers seeking the optimal balance of performance and value, 304L presents a compelling case. While 316L (with 2-3% molybdenum) delivers superior chloride resistance, 304L is 15-30% more affordable and perfectly suited for cost-sensitive projects where extreme durability is not essential. With market prices ranging from $15,300 to $24,000 per metric ton (2025 pricing), 304L remains the most widely specified stainless steel grade across global industries.
| Feature | 430 Stainless Steel | 304 Stainless Steel |
|---|---|---|
| Material Type | Ferritic (magnetic) | Austenitic (non-magnetic) |
| Chromium Content | 16-18% | 18-20% |
| Nickel Content | ≤0.75% | 8-10% |
| Corrosion Resistance | Good (dry environments) | Excellent (chloride environments) |
| Price Comparison | Benchmark (100%) | ~1.6x (superior value) |
Our stainless steel plates are widely stocked with standard dimensions ranging from 1,000mm to 2,000mm in width and 2,000mm to 6,000mm in length, with custom cutting services available to precise specifications. Combined with an established global supply chain and a standard lead time of 15 to 30 days after deposit receipt, we ensure your projects remain on schedule regardless of scale.
With over 10 years of experience in the international steel industry, we have earned a reputation for consistent quality, competitive pricing, and dependable service. Our offerings include OEM/ODM services, free samples for regular sizes (buyer covers freight), and flexible payment terms — 100% T/T advance, 30% T/T with balance against documents, or 30% T/T advance with balance by L/C at sight. Factory visits are warmly welcomed, and our professional sales team is ready to provide tailored support from initial inquiry through final delivery.
Contact us today to discuss your stainless steel plate requirements or request a competitive quotation.
