440C vs.316L stainless steel : corrosion resistant
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If you are looking for a stainless steel grade with high corrosion resistance or hardness, you may be comparing 440C stainless steel and 316L stainless steel.Both are widely used in industrial and precision applications, but their chemical composition, mechanical performance, and corrosion resistance are very different.
Which stainless steel is more corrosion resistant, 440C or 316L?
316L stainless steel has significantly better corrosion resistance than 440C. This is because 316L is an austenitic stainless steel that contains molybdenum, which enhances its resistance to chlorides and acids, whereas 440C is a martensitic stainless steel with high carbon content that prioritizes hardness and wear resistance over corrosion resistance.
440C vs.316L stainless steel :Key differences
| Property | 440C Stainless Steel | 316L Stainless Steel |
|---|---|---|
| Type | Martensitic Stainless Steel | Austenitic Stainless Steel |
| UNS Number | S44004 | S31603 |
| Standard | ASTM A276 / AISI 440C | ASTM A240 / A276 / A312 |
| Microstructure | Hard, high-carbon martensitic | Non-magnetic austenitic |
| Main Features | High hardness and wear resistance | Superior corrosion resistance and weldability |
| Magnetism | Magnetic | Non-magnetic |
| Heat Treatment | Hardenable by heat treatment | Non-hardenable, strengthened by cold working |
| Typical Applications | Bearings, cutting tools, valves | Chemical, marine, and medical components |
440C vs.316L stainless steel : Chemical Composition Comparison
440C has much higher carbon and less nickel/molybdenum, giving it superior hardness but inferior corrosion resistance compared to 316L.
316L's low carbon and added molybdenum make it far more resistant to pitting and chloride attack, especially in marine and chemical environments.
| Element | 440C (%) | 316L (%) |
|---|---|---|
| Carbon (C) | 0.95 – 1.20 | ≤0.03 |
| Chromium (Cr) | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | ≤0.75 | 10.0 – 14.0 |
| Molybdenum (Mo) | - | 2.0 – 3.0 |
| Manganese (Mn) | ≤1.0 | ≤2.0 |
| Silicon (Si) | ≤1.0 | ≤1.0 |
| Sulfur (S) | ≤0.03 | ≤0.03 |
| Iron (Fe) | Balance | Balance |
440C vs.316L stainless steel : Mechanical Properties
| Property | 440C (Hardened) | 316L (Annealed) |
|---|---|---|
| Tensile Strength | 760–1,850 MPa | 485 MPa |
| Yield Strength | 450–1,400 MPa | 170 MPa |
| Elongation | 14–17% | 40% |
| Hardness (HRC) | 56–60 | ≤95 HB (~20 HRC) |
| Density | 7.74 g/cm³ | 8.00 g/cm³ |
Which stainless steel is harder, 440C or 316L?
440C stainless steel is significantly harder than 316L stainless steel. After heat treatment, 440C can achieve a hardness of around 58 to 62 HRC (Rockwell C), while 316L has a maximum hardness of about 95 HRB (Rockwell B). This makes 440C suitable for applications requiring high hardness and wear resistance, such as knives and bearings, while 316L is favored for its superior corrosion resistance in harsh environments.
Can 440C be used in marine environments?
Not recommended. 316L is a better choice for use in seawater or humid environments.
Which is more expensive, 440C or 316L stainless steel?
440C is generally more expensive per kilogram due to its high carbon content and complex heat treatment, while 316L offers lower lifecycle costs due to its longer corrosion resistance.
Price Range (2025 Estimate)
| Material | Price per kg (USD) | Price per ton (USD) |
|---|---|---|
| 440C Stainless Steel Plate/Bar | $5.5 – $7.8 per kg | $5,500 – $7,800 per ton |
| 316L Stainless Steel Plate/Sheet | $3.2 – $4.5 per kg | $3,200 – $4,500 per ton |
💡 Note: Prices vary depending on thickness, surface finish, and order quantity. Contact Gnee for updated stock and discount offers.Email: info@gneestainless.com
Why Choose Gnee as Your Stainless Steel Supplier
✅ Over 18 years of export experience to 80+ countries
✅ Certified by ISO, SGS, BV
✅ Global stock of 316L and 440C stainless steel plates and bars
✅ Custom processing services - cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7–15 days, supported by global logistics partners
📦 Packaging & Delivery
All stainless steel products are:
Packed in wooden pallets or crates
Covered with moisture-proof wrapping
Labeled with heat number, standard, and size
Shipped worldwide via sea, air, or express
| Specification | 440C | 316L |
|---|---|---|
| Standard | ASTM A276 / AISI 440C | ASTM A240 / A276 / A312 |
| Product Form | Plate, Bar, Rod, Sheet | Plate, Sheet, Pipe, Tube, Bar |
| Finish Options | Bright, Annealed, Ground | No.1, 2B, BA, Mirror, Pickled |
| Heat Treatment | Hardened & Tempered | Solution Annealed |
| Certification | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 |
| Processing Services | CNC Cutting, Grinding, Polishing | Shearing, Laser Cutting, Welding |
| Available Thickness | 1 mm – 100 mm | 0.5 mm – 100 mm |
| Width Range | Up to 2000 mm | Up to 2000 mm |
| Length Range | 1000 – 6000 mm | 1000 – 6000 mm |
