Overview
Titanium grade 7 is a corrosion resistant alpha titanium alloy with similar mechanical properties to the commercially pure grades. It has a small palladium addition to improve corrosion resistance, particularly in mineral acids and strong brines. It is used mildly reducing or fluctuating conditions. At room temperature it is an alpha alloy. It transforms to beta phase at 913°C, and the alpha phase returns on cooling 890°C.
Titanium is reactive, with a very high affinity for oxygen, which forms a skin of very stable and highly adherent oxide. The skin gives excellent corrosion resistance, despite the reactivity of the metal. The oxide layer forms spontaneously and on exposure to the atmosphere. However, when new parent metal is exposed to anhydrous conditions or in the absence of air, rapid corrosion may occur. Care should also be taken if titanium is to operate in contact with hydrogen, as hydrogen embrittlement from hydride formation can increase strength, with loss of ductility.
Specification
STM B338-17e1 Standard Specification for Seamless and Welded Titanium and Titanium Alloy Tubes for Condensers and Heat Exchangers
| ASTM B338 Titanium Alloy Tubes Specification | ASTM B338 / ASTM B861 / ASTM B862 / ASME SB338 / ASME SB861 / ASME SB862 |
| ASTM B338 Titanium Alloy Tubes Grades | Grade 1 , Grade 2, Grade 3 , Grade 5 , Grade 7, Grade 8, Grade 9, Grade 11, Grade 12, Grade 23, UNS R50250, UNS R50400, UNS R56400, UNS R52400, UNS R56320, UNS R53400, Ti-6Al-4V, C-130AM, C-110M, Ti-4Al-3Mo-1V, Ti-6Al-2Sn-4Zr-2Mo, Ti-8Al-1Mo-1V, Ti-13V-11Cr-3Al, Ti-15V-3Cr-3Sn-3Al |
| ASTM B338 Titanium Alloy Tubes Type | Hot Rolled / Cold Drawn / Welded / ERW |
| ASTM B338 Titanium Alloy Tubes Outer Diameter Size | Seamless - 1/4"NB to 12"NB (Nominal Bore Size) Welded / ERW- 1"NB to 16"NB (Nominal Bore Size) |
| ASTM B338 Titanium Alloy Tubes Wall Thickness | Schedule 10 to Schedule 160 |
| ASTM B338 Titanium Alloy Tubes Length | 5 to 7 Meters, 09 to 13 Meters, Single Random Length, Double Random Length And Customize Size. |
| ASTM B338 Titanium Alloy Tubes Pipe Ends | Plain Ends / Beveled Ends |
| ASTM B338 Titanium Alloy Tubes Delivery Conditions | As Rolled, Cold Drawn, Hot Finish, Stress Relieved, Annealed, Hardened, Tempered |
| ASTM B338 Titanium Alloy Tubes Coating | Electropolish, Mechanical Polish, Satin Finish, Passivated |
| ASTM B338 Titanium Alloy Tubes Other Testing | ardness Test, Hydrostatic Test, Eddy Current test, Eddy Current, Tensile Test, Flattening, Flare Test, Annealed, Hydrostatic Test, Tempered, Stress Relieved etc. |
| ASTM B338 Titanium Alloy Tubes Dimension | All Pipes Is Manufactured and Inspected / Tested to the Relevant standards including ASTM And ASME |
| ASTM B338 Titanium Alloy Tubes Value Added Services | Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment |
| ASTM B338 Titanium Alloy Tubes Packaging | Loose / Bundle / Wooden Pallet / Wooden Box / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| ASTM B338 Titanium Alloy Tubes Shipment & Transportation | By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 45 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes |
| ASTM B338 Titanium Alloy Tubes Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC |
Chemical Composition
| Element | Chemical Composition % | ||||||||
| Grade 1 | Grade 2 | Grade 3 | Grade 5 | Grade 7 | Grade 9 | Grade 11 | Grade 12 | Grade 23 | |
| Nitrogen, max | 0.03 | 0.03 | 0.05 | 0.05 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Carbon, max | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 |
| Hydrogen, max | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.0125 |
| Iron, max | 0.20 | 0.30 | 0.30 | 0.40 | 0.30 | 0.25 | 0.20 | 0.30 | 0.25 |
| Oxygen, max | 0.18 | 0.25 | 0.35 | 0.20 | 0.25 | 0.15 | 0.18 | 0.25 | 0.13 |
| Aluminum | … | … | … | 5.5-6.75 | … | 2.5-3.5 | … | … | 5.5-6.5 |
| Vanadium | … | … | … | 3.5-4.5 | … | 2.0-3.0 | … | … | 3.5-4.5 |
| Tin | … | … | … | … | … | … | … | … | … |
| Ruthenium | … | … | … | … | … | … | … | … | … |
| Palladium | … | … | … | … | 0.12-0.25 | … | 0.12-0.25 | … | … |
| Molybdenum | … | … | … | … | … | … | … | 0.2-0.4 | … |
| Chromium | … | … | … | … | … | … | … | … | … |
| Nickel | … | … | … | … | … | … | … | 0.6-0.9 | … |
| Niobium | … | … | … | … | … | … | … | … | … |
| Ziconium | … | … | … | … | … | … | … | … | … |
| Silicon | … | … | … | … | … | … | … | … | … |
| Residuals, max each | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Residuals, max total | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Titanium | balance | balance | balance | balance | balance | balance | balance | balance | balance |
Mechanical Properties
ASTM B338 Tensile Strength of Titanium Tubes
Grade | Tensile Strength, min | Yield Strength (0.2% Offset) | Elongation 2 in. or 50 mm | |||||
min | max | |||||||
Ksi | (Mpa) | Ksi | (Mpa) | Ksi | (Mpa) | gage length min % | ||
Grade 1 | 35 | (240) | 25 | (170) | 45 | (310) | 24 | |
Grade 2 | 50 | (345) | 40 | (275) | 65 | (450) | 20 | |
Grade 3 | 65 | (450) | 55 | (380) | 80 | (550) | 18 | |
Grade 5 | 130 | (895) | 120 | (828) | … | … | 10 | |
Grade 7 | 50 | (345) | 40 | (275) | 65 | (450) | 20 | |
Grade 9 | 90 | (620) | 70 | (483) | 45 | … | 15 | |
Grade 11 | 35 | (240) | 25 | (170) | … | (310) | 24 | |
Grade 12 | 70 | (483) | 50 | (345) | … | … | 18 | |
Grade 23 | 120 | (828) | 110 | (759) | … | … | 10 | |
Applications
1. Anode/cathode/cell components
2. Chemical processing equipment
3. Air pollution control equipment
4. Pulp/paper bleaching/washing equipment
5. Hydrometallurgical extraction/electrowinning
6. Desalination, brine concentration/evaporation
