QQ-S-786 – 300 Series Stainless Steel Bars, Wire, and Forgings
QQ-S-786 is a mil std that outlines requirements for corrosion-resistant stainless steel bars, wire, and forgings. The mil std outlines requirements for materials used in 300 series austenitic stainless steels, ensuring that these materials have a uniform chemical makeup, as well as uniform mechanical properties and quality, where parts need to perform under demanding conditions.
QQ-S-786 is a mil std used as a guide for manufacturers of materials such as 18-8 stainless steel, more commonly known today as Type 302 and Type 304 stainless steels.
Technical Overview
QQ-S-786 materials feature:
- Austenitic chromium-nickel stainless steel (18-8 composition)
- Non-magnetic in the annealed condition, with increasing magnetism after cold working
- Excellent corrosion resistance in chemical, marine, and industrial environments
- Cold-workable for enhanced mechanical properties such as tensile and yield strength
- Not hardenable by conventional heat treatment; strength is achieved via cold work
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.