Defence
Defence work combines demanding service environments with documentation and inspection regimes that exceed commercial practice. Naval applications bring seawater exposure, land systems bring abrasion and impact, and both require certified material traceable to heat with third-party inspection where specified.
What gets specified in defence
Ordered by how commonly they are called for in this sector.
- UNS S31803 / S32205 / S32550 / S32750 / S32760Duplex / Super DuplexPREN 41
Roughly equal austenite and ferrite. Around twice the yield strength of 316L.
- UNS S31600 / S31603316 / 316LPREN 25
304 plus 2–3% molybdenum. The standard answer to chlorides and mild acids.
- UNS S1740017-4 PHPREN 20
Martensitic PH grade. Machine soft, then age to tensile strengths above 1300 MPa.
- UNS S40900 / S41000 / S43000400 SeriesPREN 17
Ferritic and martensitic chromium grades. Magnetic, nickel-free, hardenable.
- UNS N06600Inconel 600
Nickel-chromium-iron alloy. Resists oxidation and chloride SCC to high temperature.
Applications
04- Naval piping and seawater systems
- Ordnance and weapon components
- Armoured vehicle hardware
- Precision machined assemblies
Governing standards
03- ASTM A276
- ASTM A564
- MIL-S-16216
Verification available
10- Spectrometer
- Chemical Testing Laboratory
- Positive Material Identification (PMI)
- Spectro Test
- Tensile Testing Machine
- Hardness Testing Machine
- Portable Hardness Tester
- Flattening Test
- Reverse-Bend Test
- Hydrostatic Test Machine
What defence buys
Other industries
Supplying into defence?
Send the specification and service conditions. We will confirm the grade, the availability and the documentation you will need.