What's the Difference: AISI 904L VS 316L?
There are significant differences between 904l stainless steel and 316l stainless steel in terms of composition and physical properties such as corrosion resistance and temperature resistance. 904L stainless steel is composed of iron, chromium, nickel, molybdenum, copper, nitrogen and manganese, while 316L stainless steel is composed of iron, chromium, nickel and molybdenum. In terms of cost, 904L is more expensive than 316L due to its higher nickel and molybdenum content.
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Composition and Cost:
904L Stainless Steel:
Comprised of iron, chromium, nickel, molybdenum, copper, nitrogen, and manganese.
Higher levels of nickel and molybdenum contribute to superior corrosion resistance.
More expensive than 316L due to its elevated alloy content.
316L Stainless Steel:
Consists of iron, chromium, nickel, and molybdenum.
Lower alloy content results in a more cost-effective material.
Corrosion Resistance:
N08904 Stainless Steel:
Exceptional resistance to corrosion, stress-corrosion cracking, and pitting.
Ideal for high-stress applications such as chemical processing equipment.
S31603 Stainless Steel:
Offers good corrosion resistance but not as superior as 904L.
Commonly used in less aggressive environments like food processing equipment and marine settings.
Weldability:
EN 1.4539 Stainless Steel:
Less weldable compared to 316L.
High levels of chromium, nickel, and molybdenum may pose challenges in welding without causing hot cracking.
DIN 1.4404/1.4435 Stainless Steel:
Known for good weldability, making it a preferred choice for various welding applications.
Temperature Tolerance:
AISI 904L Stainless Steel:
Higher temperature tolerance than 316L.
Suitable for applications in high-temperature environments, such as oil refineries and nuclear power plants.
AISI 316L Stainless Steel:
Lower temperature tolerance compared to 904L.
Market Usage and Common Applications:
Alloy 904L Stainless Steel:
Despite superior properties, less commonly used than 316L.
More prevalent in applications requiring heightened corrosion resistance, such as chemical processing.
Alloy 316L Stainless Steel:
Widely used due to good weldability and cost-effectiveness.
Common applications include food processing equipment, chemical tanks, and marine environments.
Cost Considerations:
The price difference between 904L and 316L can vary based on market conditions.
The superior properties of 904L may justify its higher cost in applications where corrosion resistance is critical.
Magnetic Properties:
Both ss 904L and 316L are non-magnetic austenitic stainless steels.
Suitable for applications where magnetic materials are not desired.
Global Supply Capabilities: 904L and 316L Product Forms
Your material choice will dictate your sourcing strategy. HT PIPE stocks and manufactures both materials in full accordance with international standards, delivering complete material test reports (MTR) with every order.
Standard Industrial Supply: Grade 316L
For dependable, cost-effective infrastructure in standard environments, we provide:
ASTM A312 / A213 316L Seamless and Welded Stainless Steel Pipes.
ASME B16.5 316L Blind, Weld Neck, and Slip-On Flanges.
ASTM A240 316L Industrial Steel Plates and Sheets.
Premium Severe-Service Supply: Super-Austenitic 904L
For heavy chemical processing units, pulp/paper mills, and offshore utility lines, we supply:
ASTM A312 / UNS N08904 High-Performance 904L Stainless Steel Pipes.
ASTM A240 904L Corrosion-Resistant Plates for pressure vessels.
Custom Pre-Fabricated Pipe Spools executed in 904L alloy to minimize your on-site field assembly costs.
Final Procurement Verdict: Which Grade Suits Your Budget?
Procure AISI 316L if: Your operating medium involves fresh water, standard atmospheric conditions, food processing, or mild chemical handling, where its excellent weldability and affordable cost provide the best return on investment.
Upgrade to AISI 904L if: Your pipeline or vessel will directly handle warm seawater, aggressive chlorides, or mixed sulfuric/phosphoric acids, where replacing failed 316L systems would result in costly operational downtime.
Why Partner with HT PIPE?
With more than 15 years of industrial alloy exporting expertise, Zhengzhou Huitong Pipeline Equipment Co., Ltd. streamlines international logistics, verifies heat-number traceability, and ensures your exact project specifications are met without defect.
Request Your Commercial RFQ Today
Looking for pricing on custom dimensions, wall thicknesses, or specific pressure ratings? Get a rapid response from our technical export staff:
Email: market@htpipe.com
WhatsApp/WeChat: +86 193 3990 0201
Online Form:
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