Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASME SB338 GR7 UNS R52400 Ti Alloy Tube for Condenser Heat Exchanger
ASME SB338 is the standard specification for seamless and welded titanium and titanium alloy tubes or tubing which are intended for surface condensers, evaporators, and heat exchangers. It is identical with ASTM B338 except for some minor difference in product marking. There are 28 grades of titanium and titanium alloys for tubing purpose, among which Titanium Grade 2, Grade 7 and Grade 12 are most often seen in tubing applications.
Titanium Alloy Grade 7 has outstanding corrosion resistance and useful strength at low density. A small addition of palladium has been made to this alloy for a substantial increase in corrosion resistance.
What is the titanium alloy?
Titanium alloy refers to a variety of alloy metals made of titanium and other metals. Titanium is an important structural metal developed in the 1950s, titanium alloy has high strength, good corrosion resistance and high heat resistance. In the 1950s to 1960s, it was mainly the development of high-temperature titanium alloys for aeroengines and structural titanium alloys for the body.
A number of corrosion-resistant titanium alloys were developed in the 1970s, and since the 1980s, corrosion-resistant titanium alloys and high-strength titanium alloys have been further developed. Titanium alloy is mainly used in the production of aircraft engine compressor components, followed by rockets, missiles and high-speed aircraft structural parts
History of titanium development
Titanium is an important structural metal developed in the 1950s, and titanium alloy is widely used in various fields because of its high strength, good corrosion resistance and high heat resistance. Many countries in the world have realized the importance of titanium alloy materials, have carried out research and development on it, and have been practical applications.
According to relevant statistics, in 2012, the amount of titanium used in China's chemical industry reached 25,000 tons, which was reduced from 2011. This is the first time since 2009 that China's chemical titanium market has experienced negative growth. In recent years, the chemical industry has been the largest user of titanium processing materials, and its proportion in the total consumption of titanium materials has been maintained at more than 50%, accounting for as high as 55% in 2011. However, with the economic downturn, the chemical industry will not only significantly reduce the number of new projects, but also face industrial restructuring, the new production capacity of some products is controlled, and backward production capacity will be phased out. Affected by this, the shrinkage of the amount of titanium processing materials has become natural. Prior to this, some industry insiders predicted that the amount of titanium used in the chemical industry would peak between 2013 and 2015. According to the current market performance, the weakness of the overall economy in 2012 May make the decline period of chemical titanium earlier.
Chemical Composition Of GR7
| Element | Chemical Composition % |
| Grade 7 | |
| Nitrogen, max | 0.03 |
| Carbon, max | 0.08 |
| Hydrogen, max | 0.015 |
| Iron, max | 0.30 |
| Oxygen, max | 0.25 |
| Aluminum | … |
| Vanadium | … |
| Tin | … |
| Ruthenium | … |
| Palladium | 0.12-0.25 |
| Molybdenum | … |
| Chromium | … |
| Nickel | … |
| Niobium | … |
| Ziconium | … |
| Silicon | … |
| Residuals, max each | 0.1 |
| Residuals, max total | 0.4 |
| Titanium | balance |
Titanium Grade 7 Tubing Mechanical Properties
| Grade | Titanium Alloy Gr7 |
| Density | 0.163 lb/in3 |
| Tensile Strength | 50 |
| Yield Strength (0.2%Offset) | 40/65 |
| Elongation | 20% |
Titanium Grade 7 Tubing Physical Properties
| Beta Transus (F ± 25) | 1675 | ||||
| Coefficient of Thermal Expansion (10-6in./in./F) | 32-212 | 4.8 | |||
| 32-600 | 5.1 | ||||
| 32-1000 | 5.4 | ||||
| 32-1200 | 5.6 | ||||
| 32-1500 | 5.6 | ||||
| Density (lbs./cu. in.) | 0.163 | ||||
| Melting Point, Approx (F) | 3020 | ||||
| Electrical Resistivity at Room Temp. (Microhms cm) | 56 | ||||
| Modulus Elasticity - Tension (106 psi) | 14.9 | ||||
| Modulus Elasticity - Torsion (106 psi) | 6.5 | ||||
| Thermal Conductivity (Btu/hr/sq. ft./F/ft.) | 9.5 at Room Temperature | ||||
| Specific Heat (Btu/lb./F) at Room Temp. | 0.124 | ||||
| Weldability | Good | ||||
| Annealing Temp. (F) | Full | 1300°/30 Min. - 2 Hrs,; Air Cool | |||
| Stress Relief | 1000-1100°/30 Min.; Air Cool | ||||
| Forging* Temp. (F) | Blocking | 1600-1700° | |||
| Finishing | 1500-1600° | ||||
| Available Mill Products | Tube, Tubing | ||||
| Typical Application | For corrosion resistance in the chemical industry where media is mildly reducing or varies between oxidizing and reducing. | ||||
GR7 Material Equivalent
| STANDARD | WERKSTOFF NR. | UNS |
| Titanium Grade 7 | 3.7235 | R52400 |
Applications
-Chlorination systems
-Flue gas scrubbers
-Outlet ducting and stack liners for power plants, pulp and paper bleach plants, sulfur dioxide scrubbers, and weld overlay of less corrosion resistant metals
-Acid production and pickling systems
-Pharmaceutical industries use alloy fittings and tubing to avoid contamination caused by corrosion related failures
-Cellophane manufacturing
-Chlorination systems
