Titanium Beta 21S(Grade 21)

  • Titanium Beta 21s Sheet
  • Titanium Beta 21s Foil

Product Details

Titanium Beta 21S(Grade 21) Introduction

The chemical content of Titanium Beta 21S(Grade 21) is Ti-15Mo-2.7Nb-3Al-0.2Si. It is a very stable β type titanium alloy. This alloy consists of more molybdenum instead of vanadium that can improve the performance of anti-oxidation and anti-corrosion greatly and it has good cold rolling and cold forming properties. This alloy can reach high strength after aging treatment with better properties of welding, high temperature anti-oxidation and anti-corrosion. So this alloy is an ideal material in aviation structure, such as airplane hydraulic system, fuel tank. Foils can be used as titanium-based composite material in chemical engineering and petroleum processing industry. But due to many β type stable elements such as Mo and Nb, Ti Grade 21 (Beta-21S) need to be processed three times by vacuumed consumable arc furnace melting.

Besides Ti Grade 21 (β-21S) sheet, Firmetal also can produce foil, wire, tube, rod and forging piece. Sheets mainly are for making medium-complex plane cold forming parts. It can realize different match of strength and plasticity to satisfy high structure benefits, reliability design.

Titanium Beta 21S(Grade 21) Chemical Composition(wt%)
Element Impurity ≤
Mo Al Nb Si Ti Fe O C N H Other Elements
Single Total
14.0-16.0 2.5-3.5 2.4-3.2 0.15-0.25 balance 0.40 0.17 0.05 0.05 0.015 0.10 0.40
Titanium Beta 21S(Grade 21) alloy properties of wire, bar and forging pieces
Products Condition δ or d/mm Room Temperature
σb/MPa σP0.2/MPa δ5/% ψ/% KIC/MPa·m1/2
≥
Wire Solution 4.0-6.0 825-1000 — ≥12 ≥35 —
Bar Solution
and Aging		 10-70 ≥1250 ≥1105 ≥8 ≥15 —
＞75-100 ≥1250 ≥1105 ≥8 ≥15 —
≥1250 ≥1105 ≥6 ≥10 —
— — — — ≥60
＞100-180 ≥1250 ≥1105 ≥6 ≥10 —
— — — — ≥60
Forge Solution
and Aging		 ≤100 ≥1250 ≥1105 ≥8 ≥15 —
≥1250 ≥1105 ≥6(Die Forge)
≥5(Free Forge)		 ≥10 —
— — — — ≥60

Titanium Beta 21S(Grade 21) Application

Compared with other titanium alloys, it has following advantages:
1. It still can keep strength, plasticity and good match under higher pressure.
2. Excellent cold and hot processing performance, cold deformation over 75%, intermediate annealing is not needed.
3. Good high temperature performance, can work at 550℃ permanent.
4. Good anti-oxidation properties that is 10 times better than industrial pure titanium.
5. This alloy is the first high strength alloy which can bear hydrothermal oil corrosion.
Due to these advantages of Beta-21S, it is used in engine compartment where possibly will be contaminated by hydrothermal oil pollution. In light of its high temperature property, it also can be made as parts in turbine engine temperature over 425℃. Based on its anti-oxidation, Ti Gr.21 can be made into high temperature pipe and pressure wire. In addition, beta 21S has fine welding performance, it can weld wherever fits for titanium alloys. Beta-21S has better thermal expansivity compatibility with composite material compared with aluminum. So Ti Beta-21S is a main base material for composite material.

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