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ASME SA213 TP321 / GOST 9941 08Х18Н10Т / 12Х18Н10Т Stainless Steel Heat Exchanger Tubes are seamless hot-finished and cold-drawn austenitic stainless steel tubes engineered for heat exchangers, boilers, condensers and superheaters..
The tubes feature titanium-stabilized austenitic microstructure, ensuring excellent resistance to intergranular corrosion even under prolonged service temperature ranging from 427°C to 816°C. Outer diameter range: 5 ~ 273 mm; wall thickness: 0.5 ~ 22 mm; maximum manufacturing length up to 36 meters, with random length and cut-to-length production available upon request.
Chemical Composition & Material Technical Requirements
Mass Fraction of Elements for ASME SA213 TP321, %
Марка
C
Mn
P
S
Si
N
Cr
Ni
Ti
TP321
≤ 0,08
≤ 2,00
≤ 0,045
≤ 0,030
≤ 1,00
≤ 0,10
17,0 - 19,0
9,0 - 12,0
5(C+N) - 0,70
Comparison with steel grades 08Х18Н10Т and 12Х18Н10Т in accordance with GOST 5632-2014
Марка
C
Mn
P
S
Si
N
Cr
Ni
Ti
08Х18Н10Т
≤ 0,08
≤ 2,00
≤ 0,040
≤ 0,020
≤ 0,80
/
17,0 - 19,0
9,0 - 11,0
5C - 0,70
12Х18Н10Т
≤ 0,12
≤ 2,00
≤ 0,040
≤ 0,020
≤ 0,80
/
17,0 - 19,0
9,0 - 11,0
5C - 0,80
Mechanical Properties of ASME SA213 TP321
Tensile strength
Yield strength
Elongation in 2 inches or 50 mm
Hardness
≥ 515
≥ 205
≥ 35%
192 HBW / 200 HV / 90 HRB
Comparison with steel grades 08Х18Н10Т and 12Х18Н10Т per GOST 9941-2022 (GOST 9941-81)
Tensile strength
Yield strength
Elongation of 08Х18Н10Т
Elongation of 12Х18Н10Т
≥ 549
≥ 216 (Определяют по требованию заказчика)
≥ 37%
≥ 35%
Test Requirements
Tests shall be carried out in strict accordance with ASME SA213 and GOST 9941 specifications. Quality inspection is implemented at every production stage:
Type of Test
Standard
Parameters / Test Conditions
Hydrostatic Test
ASME SA213 / GOST 9941
Pressure ≥ 20 MPa, holding time no less than 5 seconds; no leakage or visible deformations permitted.
Eddy Current Testing (ET)
ASTM E309 / ASME SA213
Detection of longitudinal and transverse defects over the full tube length with a detection sensitivity of no less than 0.5 mm.
Intergranular Corrosion Test
ASTM G28 / GOST 6032-2017
Copper-sulfuric acid test; exposure duration of 24 hours; no cracks or delaminations allowed.
350°C High-temperature Tensile Test
GOST 9941
To be performed upon customer agreement.
Dimensional Inspection
ASME SA213 / GOST 9941
Square cut ends with burr removal; tubes with wall thickness above 5 mm to be machined with welding bevel.
Surface Roughness Measurement
Ra ≤ 0,8 μm
Polishing or bright finishing available on request for heat exchanger tubes with enhanced heat transfer requirements.
All tubes undergo 100% full-length non-destructive testing. Each batch is supplied with an EN 10204 3.1 / 3.2 inspection certificate stating the actual test results.
Application
ASME SA213 TP321 / GOST 9941 12Kh18N10T tubes are used for equipment operating within a temperature range of -196 °C to +600 °C (limited up to +350 °C under corrosive service media):
Oil & Gas Refining: Shell-and-tube heat exchangers, condensers and reboilers for process fluids containing hydrogen sulfide, chlorides and organic acids.
Chemical Industry: Reactors, process columns and piping for nitric acid, acetic acid, phosphoric acid and alkaline solutions.
Power Generation: Boiler superheaters, economizers and steam turbine condensers, including nuclear power plant facilities.
Upstream Oil & Gas Production: Piping systems and production equipment for hydrocarbon extraction and transportation in corrosive environments.
Food & Pharmaceutical Industry: Heat exchangers for pasteurization and sterilization processes.
Titanium Stabilization: Titanium content ≥ 5 × (C + N) % inhibits chromium carbide precipitation along grain boundaries, ensuring resistance to intergranular corrosion within the temperature range of 427–816 °C.
High-Temperature Strength: Retains mechanical properties at operating temperatures up to 600 °C (short-term service up to 800 °C) owing to its stable austenitic microstructure.
Low Surface Roughness: Optional surface finish Ra ≤ 0.8 μm minimizes flow resistance and scale deposition, enabling heat transfer coefficients to reach design-rated values.
Corrosion Resistance: Provides resistance to general and pitting corrosion across various media, including dilute acids, alkalis and salt solutions.
Customized Solutions:
Yuhong Group provides custom manufacturing services as follows:
Pre-assembled tube bundles fitted with tube sheets;
Non-standard sizes and custom constructions per customer drawings, minimum order quantity starting from 100 kg.
Frequently Asked Questions (FAQ)
What is the difference between TP321 and 12Х18Н10Т?
TP321 is the American equivalent grade (UNS S32100), with virtually identical chemical composition and mechanical properties. The primary differences lie in tolerance systems and inspection methodologies. Products from Yuhong Group comply with both standards concurrently to guarantee dual quality verification.
Are the tubes suitable for high-chloride environments?
For chloride-containing media operating above 60°C, molybdenum-alloyed grades such as TP316L are recommended. TP321 / 12Х18Н10Т performs optimally in low-to-medium chloride environments at service temperatures up to 350°C.
What type of heat treatment is applied?
The tubes are delivered in solution-annealed condition (heated at 1050–1100 °C, air or water quenched). Delivery without heat treatment is available upon special request and must be specified in the purchase order.
What is the maximum tube length you can produce?
Standard fixed lengths range from 3 m to 12 m. Custom orders can be manufactured up to 36 meters. For double-ended U-tubes, the maximum straight leg length is 12 meters with a minimum bend radius of 1.5×D.
Do you provide product certificates?
Each shipment is accompanied by an EN 10204 3.1 certificate (mill laboratory certification) or 3.2 certificate (independent third-party laboratory certification), complete with test reports for all inspections listed in the table of Section 3. The company holds an ISO 9001:2015 quality management system certificate and approval documentation for deliveries compliant with EAEU standards.
Is incoming inspection required at the customer’s manufacturing site?
It is recommended. Sampling incoming inspection is acceptable, since every tube has already undergone 100% non-destructive testing.
Contact
To receive a commercial quotation or technical consultation, please contact us:
E-mail: vladimir@steelseamlesspipe.com
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Trading Company,Seller
Year Established:
1990
Total Annual:
50M-75M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Holding Group equipments production base at Jiangsu Jiangyin City, Jinjiang City and Yancheng City. Total production area around 184000 square meters, main products : Heat Exchanger, Condenser, Pressure Vessel , Fired Heater, Economizer, Columns, Reactor.
... Yuhong Holding Group equipments production base at Jiangsu Jiangyin City, Jinjiang City and Yancheng City. Total production area around 184000 square meters, main products : Heat Exchanger, Condenser, Pressure Vessel , Fired Heater, Economizer, Columns, Reactor.
...
