Overview
316Ti (UNS S31635) is a titanium stabilised version of 316 molybdenum-bearing austenitic stainless steel. This 316 alloys are more resistant to general corrosion and pitting/crevice corrosion than the conventional chromium-nickel austenitic stainless steels such as 304. They also offer higher creep, stress-rupture and tensile strength at elevated temperature.
AISI 316Ti tube is identical to 316L but it is having very good mechanical properties and high-temperature properties. 316Ti tubes are containing titanium in small proportions. Titanium content is nearly 0.5%. The major benefit of these tubing is that it can efficiently handle high temperatures for a longer time without occurring the sensations. In these tubes, the resistance to corrosion is well-enhanced resistance to general corrosion especially against hydrochloric acid, formic acid, sulfuric acid, alkaline chlorides, etc.
The applications wherein the usability of these tubes are extensively seen are pharmaceuticals, specialty chemicals, petrochemicals, chemical industry, offshore oil drilling industry, pulp & paper industry, power generations, heat exchangers, condensers and many more.
Specification
ASTM A213/A213M-21a Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
| Specifications | ASTM A213 / ASME SA213 |
| Dimensions | ASTM, ASME and API |
| Range | 1/2"OD - 12"OD |
| Outside Diameter | 3.00 mm - 219.10 mm, 6.35 mm O.D to 114.3 mm O.D |
| Length | Single Random, Double Random & Required Length |
| Thickness | 0.40 mm - 12.70 mm, 0.8 mm to12.7 mm |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS |
| Type | Seamless |
| Form | Round Tube, Square Tube, Rectangular Tube |
| End | Plain End, Beveled End, Treaded |
Equivalent Grades for Stainless Steel TP 316Ti Seamless Tubes:
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 316Ti | 1.4571 | S31635 | SUS 316Ti | 320S31 | 08Ch17N13M2T | Z6CNDT17-123 | X6CrNiMoTi17-12-2 |
Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
| SS 316Ti | 0.08 max | 2.0 max | 0.75 max | 0.045 max | 0.030 max | 16.00 - 18.00 | 2.00 - 3.00 | 10.00 - 14.00 | 68.395 min |
Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1399 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
Physical Properties
Physical Properties (Room Temperature) | ||
Specific Heat (0-100°C) | 500 | J.kg-1.°K-1 |
Thermal Conductivity | 14.6 | W.m -1.°K-1 |
Thermal Expansion | 16.5 | mm/m/°C |
Modulus Elasticity | 193 | GPa |
Electrical Resistivity | 7.4 | μohm/cm |
Density | 7.99 | g/cm3 |
SS 316Ti Tube ASTM A213 Tolerances
| Specification | Allowable Outside Diameter Variation in mm | Allowable Wall Thickness Variation | Exact Length Tolerance in mm | Testing | ||||
| Nominal Diameter | Over | Under | %Over | %Under | Over | Under | ||
ASTM-A213 TP316Ti | Under 25.4 | .1016 | .1016 | +20 | -0 | 3.175 | 0 | Flattening Test |
| 25.4-38.1 incl | .1524 | .1524 | +22 | -0 | 3.175 | 0 | Tension Test | |
| 38.1-50.8 excl | .2032 | .2032 | +22 | -0 | 3.176 | 0 | Flare Test | |
| 50.8-63.5 excl | .254 | .254 | +2 | -0 | 4.46 | 0 | Hardness Test | |
| 63.5-76.2 excl | .316Ti8 | .316Ti8 | +22 | -0 | 4.76 | 0 | 100% Hydrostatic test | |
| 76.2-101.6 incl | .381 | .381 | +22 | -0 | 4.76 | 0 | Refer to ASTM A-450 | |
Applications
- 1. Food preparation equipment particularly in chloride environments.
- 2. Laboratory benches & equipment.
- 3. Coastal architectural panelling, railings & trim.
- 4. Boat fittings.
- 5. Chemical containers, including for transport.
- 6. Heat Exchangers.
- 7. Woven or welded screens for mining, quarrying & water filtration.
- 8. Threaded fasteners.
- 9. Springs.
