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{"title":"Duplex Stainless Steel Pipe, ASTM A790 , ASTM A928 , S31803 , S32750, S32760,","imgUrl":"https:\/\/img.chinax.com\/nimg\/1d\/46\/c18d1bb6c55b9e005664cc26fe29-200x200-1\/duplex_stainless_steel_pipe_2c_astm_a790_2c_astm_a928_2c_s31803_2c_s32750_2c_s32760_2c_s31254_2c_254mo_2c_253ma.jpg","attrs":{"Place of Origin":"China, USA, Korea, UE","Brand Name":"YUHONG","Certification":"ABS, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008","Minimum Order Quantity":"100KGS"}}
{"title":"Super Duplex Stainless Steel Pipes, EN 10216-5 1.4462 \/ 1.4410, UNS32760(1.4501)","imgUrl":"https:\/\/img.chinax.com\/nimg\/5a\/4a\/768d54c53c4dde90d67ea9632a0f-200x200-1\/super_duplex_stainless_steel_pipes_2c_en_10216_5_1_4462_2f_1_4410_2c_uns32760_281_4501_29_2c_pickled_26_annealed_2c_2c20ft.jpg","attrs":{"Place of Origin":"China, USA, Korea, UE","Brand Name":"YUHONG SPECIAL STEEL","Certification":"ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008","Minimum Order Quantity":"100KGS"}}
{"title":"Duplex Steel Pipes , Super Duplex Pipes, A789, A790 , A928 S31803(2205) S32750","imgUrl":"https:\/\/img.chinax.com\/nimg\/c6\/64\/6b128cc50c8e244b69695b7e081a-200x200-1\/duplex_steel_pipes_2c_super_duplex_pipes_2c_a789_2c_a790_2c_a928_s31803_282205_29_s32750_282507_29_s32760.jpg","attrs":{"Place of Origin":"China","Brand Name":"YUHONG","Certification":"ABS, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008","Minimum Order Quantity":"100KGS"}}
{"title":"ASTM A790 S32750 Super Duplex Steel Seamless Pipe Water Treatment Equipment","imgUrl":"https:\/\/img.chinax.com\/nimg\/4c\/20\/abd14e3e23feec7ec6c3993e7f39-200x200-1\/astm_a790_s32750_super_duplex_steel_seamless_pipe_water_treatment_equipment.jpg","attrs":{"Place of Origin":"China","Brand Name":"YUHONG","Certification":"ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008","Minimum Order Quantity":"500kgs"}}
{"title":"ASTM A790 UNS S32750\uff082507, 1.4410 ), Super Duplex Stainless Steel Pipes, PREN>40","imgUrl":"https:\/\/img.chinax.com\/nimg\/c9\/50\/d0a97184ab9bb4e0d66261e9eaf0-200x200-1\/astm_a790_uns_s32750_ef_bc_882507_2c_1_4410_29_2c_super_duplex_stainless_steel_pipes_2c_pren_3e40.jpg","attrs":{"Place of Origin":"China","Brand Name":"YUHONG","Certification":"ABS, BL, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015","Minimum Order Quantity":"100KGS"}}
{"title":"Duplex Stainless Steel Pipe ,SA789, SA790, SA928,DIN17456\/17458,EN10216-5 UNS","imgUrl":"https:\/\/img.chinax.com\/nimg\/ae\/20\/ba7e287d9b6c22b2cd6917c54c93-200x200-1\/duplex_stainless_steel_pipe_2csa789_2c_sa790_2c_sa928_2cdin17456_2f17458_2cen10216_5_uns_s31803_2cs32205_2cs32101_2cs32304_2cs3275.jpg","attrs":{"Place of Origin":"China,USA, Korea, UE","Brand Name":"YUHONG SPECIAL STEEL","Certification":"ABS, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008","Minimum Order Quantity":"100KGS"}}
ASTM A358 TP321 Class 1 EFW (Electric Fusion Welded) Stainless Steel Pipe is manufactured from stabilized austenitic stainless steel containing titanium additions to improve resistance to intergranular corrosion at elevated temperatures. The material is designed for high-temperature pressure service where long-term thermal stability and oxidation resistance are required.
Produced according to ASTM A358 / ASME SA358 specifications, TP321 EFW pipe is widely used in petrochemical plants, refinery units, power generation facilities, heat recovery systems, and process piping exposed to temperatures ranging from 425°C to 900°C. The electric fusion welding process enables the production of large-diameter pipes while maintaining structural integrity and dimensional consistency.
Technical Specifications
Item
Specification
Standard
ASTM A358 / ASME SA358
Material Grade
TP321 / UNS S32100
Pipe Type
Electric Fusion Welded (EFW)
Class
Class 1
Manufacturing Process
Electric Fusion Welding
Outside Diameter
1/8" – 64" NB
Wall Thickness
SCH 5S – SCH XXS
Length
Random Length / Fixed Length
Inspection
UT, RT, HT, PMI Available
Surface Finish
Pickled, Passivated
Certification
EN10204 3.1 / Third Party Inspection
Product Advantages
Why Choose TP321 EFW Stainless Steel Pipe?
High Temperature Stability
Titanium stabilization minimizes carbide precipitation and improves resistance to intergranular corrosion after prolonged exposure to elevated temperatures.
Suitable for Large Diameter Fabrication
The EFW manufacturing process allows production of large-diameter pipes up to 64 inches while maintaining weld quality and dimensional accuracy.
Corrosion Resistance
The chromium-nickel stainless steel composition provides reliable resistance to oxidation and process media in petrochemical environments.
Inspection Available
UT, RT, HT, PMI and third-party inspection can be provided according to project requirements.
Main Features of UNS S32750 Super Duplex Stainless Steel
UNS S32750 has excellent corrosion resistance in a wide variety of corrosive chemicals
Outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C
High strength compared to austenitic and 22%Cr duplex stainless steels
Excellent ductility and impact strength at both ambient and sub-zero temperatures
High resistance to abrasion, erosion and cavitation erosion
Excellent resistance to stress corrosion cracking in chloride containing environments
UNS S32750 is listed in NACE MR 01 75 for sour service
ASME Approval for Pressure Vessel application
Duplex Stainless Steel Pipe Application:
Chemical processing, Transport and Storage.
Oil and gas exploration and offshore rigs.
Oil and gas refining.
Marine environments.
Pollution control equipment.
Pulp and paper manufacturing
Chemical process Plant
Chemical Composition of A358 TP321
Grade
C
max
Si
max
Mn
max
P
max
S
max
Cr
Ni
Mo
N
UNS S32750
0.030
0.8
1.2
0.030
0.015
24.0-26.0
6.0-8.0
3.0-5.0
0.24-0.32
UNS S31803
0.030
1.0
2.0
0.020
0.020
21.0-23.0
4.5-6.5
2.5-3.5
0.08-0.20
UNS S31500
0.030
1.0
1.2-2.0
0.030
0.030
18.0-19.0
4.5-5.5
2.5-3.5
0.05-0.10
Physical Properties of A358 TP321
Grade
Y.S.MPa min
T.S.Mpa min
Elongation %
Hardness HRC
UNS S32750
550
800
15
20
UNS S31803
450
620
25
20
UNS S31500
440
630
30
20
Frequently Asked Questions
1. What is the difference between TP321 and TP304?
TP321 contains titanium stabilizing elements that improve resistance to intergranular corrosion under high-temperature service conditions.
2. What does Class 1 mean in ASTM A358?
Class 1 pipes are welded using filler metal without subsequent radiographic examination requirements specified for higher classes.
3. What industries use TP321 EFW pipes?
Petrochemical, refinery, power generation, heat exchanger manufacturing, and thermal processing industries.
4. Can TP321 EFW pipes be supplied with third-party inspection?
Yes. BV, SGS, TUV, DNV and other third-party inspections are commonly available.
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...
