Welding Titanium Tube Grade 2
Specification : ASTM B861, B338, B388, B862 / ASME SB861, SB338, SB388, SB862
Pipe Range : ½"NB to 24"NB / SCH 10 – SCH XXS
Tubes Range: 1mm OD to 254mm OD / Thickness 0.1 to 20mm.
Type : Seamless / ERW / Welded / Fabricated Pipes
Form : Round, Square, Rectangular, Oval, Hydraulic Etc
Length : Single Random, Double Random & Required Length
End : Plain End, Beveled End, Treaded
Description
1. Overview
Grade 2 is the workhorse grade of commercially pure titanium (CP-2). Due to its excellent properties, titanium is widely used in aviation, aerospace, chemical industry, petroleum, metallurgy, light industry, electric power, seawater desalination, ships and daily-life appliances. Within the CP family, Grade 2 offers the best overall balance of corrosion resistance, formability, weldability and cost, which is why it is the most commonly specified titanium grade for industrial tubing.
2. Chemical Composition (per ASTM B862)
| Element | Content (%, max) |
|---|---|
| Nitrogen (N) | 0.03 |
| Carbon (C) | 0.08 |
| Hydrogen (H) | 0.015 |
| Iron (Fe) | 0.30 |
| Oxygen (O) | 0.25 |
| Titanium (Ti) | Balance |
3. Mechanical Properties (per ASTM B862)
| Property | Value |
|---|---|
| Tensile strength (UTS), min | 345 MPa (50 ksi) |
| 0.2% yield strength, min | 275 MPa (40 ksi) |
| Elongation, min | 20% (on 2 in or 50 mm) |
4. Specifications
- Standards: ASTM B862 / ASME SB862 (welded titanium pipe); ASTM B338 / B388 (welded titanium condenser and heat-exchanger tube); ASTM B861 / ASME SB861 covers the seamless equivalents for comparison
- Pipe range: ½" NB to 24" NB, SCH 10 to SCH XXS
- Tubes range: 1 mm to 254 mm outside diameter, wall thickness 0.1 to 20 mm
- Form: round, square, rectangular, oval, hydraulic, etc.
- Length: single random, double random and required length
- End: plain end, beveled end, threaded end
5. Manufacturing and Quality
Grade 2 welded tubes are produced from titanium strip that is roll-formed and longitudinally welded by gas tungsten arc welding (GTAW/TIG) under strict inert gas shielding, because molten titanium absorbs oxygen and nitrogen readily, which embrittles the weld. After welding the tube is sized and annealed or stress-relieved. The weld seam is verified by 100% eddy current or ultrasonic testing, and the finished tube is hydrostatically tested per ASTM B862.
6. Grade 1-5 Comparison (Corrected)
Grades 1 to 4 are commercially pure titanium - they contain no alloying elements and differ in strength, which is developed through controlled oxygen and iron content. Grade 5 is the Ti-6Al-4V alloy.
| Grade | Type | Typical composition | Key characteristics |
|---|---|---|---|
| Grade 1 | Commercially pure | 99.5% Ti (low O & Fe) | Maximum formability and corrosion resistance, lowest strength of the CP grades; chemical processing and medical use |
| Grade 2 | Commercially pure | 99.2% Ti (O ≤ 0.25) | Best overall balance of strength, weldability and corrosion resistance; the standard industrial grade |
| Grade 3 | Commercially pure | Ti with O ≤ 0.35 | Higher strength than Grade 2 with good corrosion resistance |
| Grade 4 | Commercially pure | Ti with O ≤ 0.40 | Highest strength of the CP grades; fasteners, medical and structural use |
| Grade 5 | α+β alloy | Ti-6Al-4V | Highest strength of the common grades; aerospace, medical and high-performance applications |
The original page described Grades 2-5 as containing alloying elements such as aluminum, manganese, silicon, vanadium, chromium, nickel, copper, tin and zirconium, and attributed aeroengine blade and compressor impeller service to pure titanium. Those statements are incorrect: only Grade 5 carries alloying additions (aluminum and vanadium), and rotating aeroengine parts are made of titanium alloys, not commercially pure titanium. The table above reflects the standard ASTM classification.
7. Applications
- Chemical heat exchangers and process piping
- Seawater desalination plants and offshore equipment
- Power-plant condensers and cooling systems
- Architectural and marine structures
- Food processing and general industrial equipment
About Us
GNEE was established in 2008 with 19 years of experience in foreign trade export. Our main products are titanium tubes, titanium rods, titanium wires, titanium foils, titanium sheets and parts of various specifications. We cooperate with many famous factories to provide you with large quantities of high quality metals and customized products. We have up to 200 employees and will continue to grow in the future. All of them are committed to providing you with better products and services. We are committed to providing you with the best products and services, and we will provide you with more favorable pricing and safe and fast transportation solutions.GENN is trustworthy. We look forward to working with you.
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