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{"title":"ASME SB338 GR.7 \/ UNS R52400 Titanium Alloy Seamless Heat Exchanger Tube","imgUrl":"https:\/\/img.chinax.com\/nimg\/57\/cb\/013fcba50a7d7b427fbe8ef70a11-200x200-1\/asme_sb338_gr_7_2f_uns_r52400_titanium_alloy_seamless_heat_exchanger_tube.jpg","attrs":{"Brand Name":"YUHONG","Model Number":"ASME SB338 Gr.7 Seamless Tube","Certification":"ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015","Place of Origin":"China"}}
ASME SB338 UNS R50400 Seamless Titanium Tubes for Condensers and Heat Exchangers
Industry-recognized Grade 2 titanium tubing engineered for surface condensers, evaporators, and shell-and-tube heat exchangers where seawater, brine, or chloride-laden cooling media are specified.
Company Profile & Technical Authority
Yuhong Group Co., Ltd. specializes in the engineering and supply of heat exchangers, pressure vessels, and air-cooled equipment for power generation, chemical processing, and offshore applications. Our manufacturing scope encompasses complete tube bundles, U-bend tubes, finned tubes, and exchanger components including tubesheets, baffles, and channel heads.
Chemical Composition
Element
Weight % (max)
Element
Weight % (max)
Nitrogen (N)
0.03
Oxygen (O)
0.25
Carbon (C)
0.08
Hydrogen (H)
0.015
Iron (Fe)
0.30
Titanium (Ti)
Remainder
Complies with ASME SB338 Section II Part B requirements for Grade 2 (UNS R50400) material.
Manufacturing & Testing Requirements
Manufacturing Process: Cold-drawn seamless process performed in contamination-controlled environments. Titanium's high reactivity at elevated temperatures requires strict exclusion of carbon steel tooling contact, dedicated machining areas, and inert gas shielding during any thermal operations.
Mandatory Tests per ASME SB338:
Flattening test
Flaring (expansion) test
Hydrostatic or pneumatic pressure test
Eddy current or ultrasonic nondestructive examination
Quality Control Parameters: Outer diameter tolerance ±0.05mm; wall thickness tolerance ±0.03mm; H7-level tube hole tolerance for tubesheet fitment.
Complementary Fabrication Capabilities
Component
Material Grades Available
Fabrication Scope
Tubesheets
SB265 Gr.2 / SB265 Gr.12 / Clad Plate
Precision drilling to H7 tolerance; Ra ≤ 3.2 μm finish
Baffles / Supports
SB265 Gr.2
Laser-cut or waterjet; deburred and cleaned
Channel Heads
SB265 Gr.2 / Carbon Steel Lined
Code-stamped; design per ASME Section VIII Div.1
U-Bend Tubes
SB338 Gr.2
As-drawn or stress-relieved; in-line eddy current tested
Application Environments
Industry
Typical Equipment
Service Condition
Power Generation
Steam turbine condensers; cooling water heat exchangers
Seawater, brackish water, or treated cooling tower water
Corrosion immunity: Virtually immune to chloride stress corrosion cracking, pitting, and crevice corrosion across the pH range of seawater and brine environments.
Dropwise condensation: Low liquid wettability promotes dropwise condensation on tube surfaces, maintaining a continually renewed heat transfer surface.
Fouling resistance: Smooth surface finish reduces scale adhesion, extending cleaning intervals and sustaining heat transfer coefficients.
Material efficiency: Enhanced corrosion resistance permits thinner wall designs relative to copper alloys or stainless steels, improving thermal conductance.
Customization Scope: Tubes can be supplied in straight lengths or U-bend configurations; plain or low-fin surface profiles; beveled or plain ends; with full material test certificates (EN 10204 3.1/3.2).
Common Technical Inquiries
Q: What is the difference between Grade 2 and Grade 2H?
A: Grade 2H offers a guaranteed minimum ultimate tensile strength of 58 ksi (400 MPa) versus Grade 2's 50 ksi (345 MPa). Both share identical chemistry and may be certified under the standard specification.
Q: Can ASME SB338 Grade 2 tubes be used for ASME pressure vessel applications?
A: Yes. ASME Section VIII recognizes SB338 material. Grade 2H is explicitly intended for pressure vessel use.
Q: How does titanium compare with 90/10 Cu-Ni for seawater service?
A: Titanium provides practical immunity to seawater corrosion, eliminates velocity limitations, and withstands stagnant or low-flow conditions that accelerate copper alloy attack.
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
