MIL-S-7720 - 300 Series Stainless Steel Bars, Wire, and Forgings
MIL-S-7720 deals with corrosion-resistant 18-8 stainless steel bars, wire, and forging stock for use in the manufacture of aircraft parts. The specification was initially MIL-S-7720A (Amendment 2), dated July 26, 1974, but has been revised and referenced by SAE AMS-S-7720 for standardization.
This specification deals with the 300 series of austenitic stainless steels, providing high resistance to corrosion, durability, and high strength for parts exposed to severe environmental conditions.
Technical Overview
MIL-S-7720 stainless steel is primarily Type 302 and Type 304 equivalents, which are:
- Austenitic chromium-nickel stainless steels
- Non-magnetic in annealed condition
- Cold-workable to increase strength and hardness
- Highly corrosion-resistant, suitable for aerospace and industrial environments
What is 302 Stainless Steel ?
302 Stainless Steel is a chromium-nickel austenitic metal that is famous for its corrosion resistance, strength, and ductility. It is used in both annealed and cold-worked conditions, making it an extremely useful metal for numerous forming operations.
302 STAINLESS STEEL SPECIFICATIONS
SHEET SOLUTION HEAT TREATED
Optimized for formability and corrosion resistance through heat treatment.
BARS & FORGINGS
High-strength bars and forgings for precision-machined parts.
FEDERAL & MILITARY SHEET SPECIFICATIONS
Standards ensuring reliability in defense and aerospace use.
OIL & GAS
Corrosion-resistant grades for sour service and harsh environments.
Certified Material for Critical Service
Fighter Jet Metals supplies 302 Stainless Steel certified for aerospace and defense use, fully traceable with Mill Test Reports (MTRs) and compliance to industry standards including AMS, ASTM, and NACE.
Typical specifications include:
- Sheet / Strip: AMS 5515, AMS 5516, AMS 5903, AMS 5904, AMS 5905, AMS 5906
- Bars & Forgings: AMS 5636, AMS 5637, AMS 5688
- Federal Specifications: AMS-QQ-S-763, AMS-QQ-S-766, MIL-S-5059, MIL-S-7720
Each lot conforms to NACE MR0103 / MR0175 for sour service where applicable, ensuring corrosion resistance in oil and gas environments.