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ASME SB338 Grade 7 Seamless Round Titanium Pipe Welding for Condensers / Heat Exchangers

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ASME SB338 Grade 7 Seamless Round Titanium Pipe Welding for Condensers / Heat Exchangers

Country/Region china
City & Province shanghai shanghai
Categories Pig Iron

Product Details

ASME SB338 Grade 7 Seamless Round Tube Titanium Pipe Welding for Condensers / Heat Exchangers

 

Description

 

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.

 

Grade 7 is mechanically and physically equivalent to Grade 2, except with the addition of the interstitial element palladium, making it an alloy. Grade 7 possesses excellent weldability and fabricality, and is the most corrosion resistance of all titanium alloys. In fact, it is most resistant to corrosion in reducing acids.

Grade 7 is used in chemical processes and production equipment components.

 

Titanium Grade 7 has physical and mechanical properties equivalent to CP3 titanium or Grade 2. It has excellent welding and fabrication properties and is extremely resistant to corrosion especially from reducing acids.

 

Excellent Weldability Titanium


Excellent Fabricability


Physical Properties Equivalent to CP Grade 2


Mechanical Properties Equivalent to CP Grade 2


Most Resistant to Corrosion in Reducing Acids

 

Chemical Analysis of Titanium Grade 7:

 

C0.08 Max
N0.03 Max
O0.25Max
H0.015Max
Pd0.12 - 0.25
TiBal.
Fe0.30 Max

 

Mechnical Property:

 

 0.2% Proof StressTensile StrengthElongation
MPaMPa%
Annealed275-47534520

 

Titanium Grade 7 Specifications:

 

ExtrusionASME SB-363
ForgingsASME SB-381
Pipe

ASME SB-337


ASME SB-338

Round Bar/WireASME SB-348
Sheet/PlateASME SB-265
Tubes

ASME SB-337


ASME SB-338

 

Comparative Corrosion Rates:

 

Corrosive Medium
Concentration
%
Temp
°C
Corrosion Rate
mm/year
Grade 7Grade 2
Aluminium Chloride
10100<0.025<0.025
 251000.02550
Chlorine (wet)
Room<0.025<0.025
Citric Acid
50Boiling<0.0250.4
Hydrochloric Acid (HCI)
5Boiling0.18>10
Hydrochloric Acid (N2 Saturated)
31900.025>28
 51900.1>28
 101908.8>28
 1519040
Hydrochloric Acid (O2 Saturated)
31900.13>28
 51900.13>28
 101909.2>28
Sodium Chloride
Brine93<0.025
 10190<0.025
+ Acidified pH1.2
23(a)Boilingnil
Sulphuric Acid
5Boiling0.548
Sulphuric Acid (N2 Saturated)
11007
 11900.13
 510026.5
 51900.13
 101901.5
Formic Acid
50Boiling0.0753.6
Oxalic Acid
1Boiling1.1345
Phosphoric Acid
50701.810
 10Boiling3.211

 

 

 

 

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