Standard & Heat-Resistant Grades (304 / 309 / 310) – Exotic Metals
LLP
These grades are defined by their chromium and nickel
content, optimized for either general corrosion or high-heat environments.
Mechanical Properties (Annealed)
| Property |
Grade 304 |
Grade 310 |
| Tensile Strength |
≥ 515 MPa |
≥ 515 MPa |
| Yield Strength |
≥ 205 MPa |
≥ 205 MPa |
| Hardness (Max) |
92 HRB |
95 HRB |
Molybdenum-Stabilized Grades (316 / 317 / 316Ti)
The addition of Molybdenum (2- 4%) provides essential
protection against pitting and crevice corrosion in chloride-rich environments (like
seawater).
Austenitic Stainless Steel Grades
- 316 (S31600): The marine-grade standard
- 317 / 317L (S31703): Contains higher molybdenum (3–4%) for aggressive chemical
environments involving pulping or acidic waste
- 316Ti (S31635): Titanium-stabilized version of 316. The titanium prevents
intergranular corrosion during welding and high-temperature exposure (425°C–815°C)
Stabilized High-Temp Grades (321 / 347)
Used specifically when components must operate in the
carbide precipitation range without losing corrosion resistance.
Stabilized Stainless Steel Grades
- 321 (S32100): Stabilized with Titanium. Commonly used for aircraft exhaust stacks
and manifolds
- 347 (S34700): Stabilized with Columbium (Niobium). Preferred over 321 for
high-temperature aqueous and pharmaceutical environments where knifeline corrosion
is a risk
Advanced High-Performance (Nitronic 50 / 60)
Nitronic Grades
- Nitronic 50 (S20910): Offers double the yield strength of 316 and better corrosion
resistance. It remains completely non-magnetic even after severe cold working
- Nitronic 60 (S21800): Specifically engineered for galling and wear resistance. It is
the industry standard for bridge pins, valve stems, and fasteners where
metal-on-metal friction occurs
Chemical Composition Comparison (%)
| Grade |
Cr |
Ni |
Mo |
Mn |
Other |
| 316Ti |
16.0–18.0 |
10.0–14.0 |
2.0–3.0 |
2.0 |
Ti: 5 × (C+N) |
| Nitronic 50 |
20.5–23.5 |
11.5–13.5 |
1.5–3.0 |
4.0–6.0 |
Nb, V, N |
| Nitronic 60 |
16.0–18.0 |
8.0–9.0 |
— |
7.0–9.0 |
Si: 3.5–4.5 |
