When it comes to knife manufacturing, choosing the right stainless steel grade plays a critical role in performance, durability, and cost. Two commonly discussed grades are 420 and 304 stainless steel — but they serve very different purposes.
In this article, we break down the key differences to help you choose the right material for your application.
1. Overview: 420 vs 304 Stainless Steel
420 Stainless Steel
Martensitic stainless steel
High carbon content
Can be hardened through heat treatment
Commonly used for blades and cutting tools
304 Stainless Steel
Austenitic stainless steel
Low carbon content
Excellent corrosion resistance
Widely used in kitchen equipment and food processing
In short:
420 is made for cutting — 304 is made for corrosion resistance.
2. Hardness & Edge Retention
One of the most important factors for knives is hardness.
420 stainless steel can be heat-treated to achieve high hardness, allowing it to hold a sharp edge longer.
304 stainless steel cannot be hardened, making it too soft for blade applications.
✅ Winner: 420 stainless steel
3. Corrosion Resistance
304 stainless steel offers excellent resistance to rust and corrosion, even in humid or acidic environments.
420 stainless steel has moderate corrosion resistance, but is more prone to rust if not properly maintained.
✅ Winner: 304 stainless steel
4. Strength & Durability
420 provides better wear resistance and mechanical strength after heat treatment.
304 is more ductile and formable, but lacks the strength required for cutting edges.
✅ Winner: 420 stainless steel (for knives)
5. Cost Consideration
420 stainless steel is generally more cost-effective for blade production.
304 stainless steel tends to be more expensive due to its higher nickel content.
For manufacturers, 420 offers better value for knife production.
6. Applications in the Knife Industry
420 Stainless Steel
Kitchen knives
Surgical instruments
Scissors and cutting tools
304 Stainless Steel
Knife handles
Food-grade equipment
Kitchen surfaces
7. Final Verdict: Which One Should You Choose?
If you're manufacturing knives:
Choose 420 stainless steel for blades due to its hardness and edge retention
Use 304 stainless steel for handles or non-cutting components where corrosion resistance matters most
The best solution is often a combination of both materials.
Why Choose DSM as Your Stainless Steel Supplier?
At DSM, we supply a wide range of stainless steel grades, including 420 and 304, tailored for manufacturing applications.
Consistent quality and certified materials
Custom processing: slitting, cut-to-length
Reliable supply for bulk orders (MOQ from 2 tons)
Fast delivery to support your production schedule
Get in Touch
Looking for the right stainless steel for your knife production?
Contact DSM today to get expert advice and a competitive quote.
