Stainless Steel Seamless Pipe Manufacturer in China Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. has produced seamless pipe and tube since 1985 in austenitic, super austenitic, duplex and nickel alloy grades, supplied to more than 60 countries.
1985
25,000 t
60+
41
Manufacturing since
Annual capacity
Countries supplied
Certificates held
ASTM A312 | ASME SA-312 | EN 10216-5 | JIS G3459 | GB/T 14976 | ISO 9001 | PED | NORSOK M-650
www.xtd-ss.com
About XTD Stainless Steel Manufacturer of seamless stainless steel, duplex and nickel alloy pipe since 1985
XTD has worked in special steel since 1985. The head office is in Wenzhou, Zhejiang Province. Seamless pipe and tube are produced at the Songyang plant, opened in 2017, and at Fujian Tengqi Pipe Industry Technology, our wholly owned subsidiary since 2019. •
ISO 9001, ISO 14001 and ISO 45001 certified manufacturing
•
Full traceability from billet to delivery, with 100% PMI on every heat
•
Export packaging, documentation and logistics support
•
Regular stock of common grades for faster despatch
1985
25,000 t
390+
45,000 m²
Manufacturing since
Annual capacity
People employed
Facility area
Plant: two hot extrusion presses | four cold-pilger rolling mills | 20+ cold drawing and cold rolling lines | hydrogen bright annealing furnace | pickling and passivation line
www.xtd-ss.com
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd.
Stainless Steel Seamless Pipe Grades We Supply Austenitic, super austenitic, duplex, super duplex and nickel alloy seamless pipe and tube
Austenitic stainless
Super austenitic
Duplex and super duplex
Nickel alloys
304, 304L, 304H, 309, 310, 310S, 314, 316, 316L, 316LN, 316Ti, 317, 317L, 321, 321H, 347, 347H
904L, 254 SMO, 654 SMO, 253MA, 310MoLN. Chosen for acidic service, high chloride and chemical processing duty.
S31803, S32205, S32550, S32750, S32760 and S32707 hyper duplex for offshore, seawater and desalination lines.
Inconel 600, 601, 617, 625, 718; Incoloy 800, 825, 925; Hastelloy C276, C22, B2, C2000; Monel 400, K500; Nickel 200, 201; Alloy 20.
Also supplied as boiler, superheater, heat exchanger, condenser and U-tubes, heavy wall and high-pressure sections, and polished, brushed or mirror-finished tube.
www.xtd-ss.com
Seamless Pipe Size Range and End Finishes Every size below is produced in house, from thin-wall instrument tube to heavy wall large bore pipe.
6 – 1016 mm
Outside diameter
1 – 65 mm
Wall thickness
Up to 18 m
Length
End finishes Hot-finished pickled and passivated • cold-drawn bright • polished • brushed • mirror finish. Solution annealing, pickling and straightening complete every pipe. Common austenitic and duplex sizes are held in stock for short delivery. www.xtd-ss.com
Grades and International Standards Manufactured and tested to ASTM, ASME, EN, JIS, GB/T and GOST specifications
304 / 304L
316 / 316L
321 / 347
Standards compliance
General service, food grade, architectural
Chemical, marine, pharmaceutical
High temperature, stabilised grades
•
ASTM A312 / A213 / A269
•
ASME SA-312 / SA-213
•
EN 10216-5
310S Extreme heat, furnace parts
2205 / 2507
904L
•
JIS G3459 / G3463
•
GB/T 14976
Oil and gas, offshore, desalination
Acidic service, chemical processing
•
GOST 9941
Equivalents supplied on request: UNS S30400 / 1.4301 / SUS304 / 06Cr19Ni10 • UNS S31603 / 1.4404 / SUS316L • UNS S32205 / 1.4462. Custom sizes, lengths and end finishes are made to order.
Every order ships with EN 10204 3.1 or 3.2 material test certificates.
www.xtd-ss.com
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd.
Quality Testing on Every Seamless Pipe 1
Chemical analysis Optical emission spectrometry on raw material and finished pipe, with 100% PMI on every heat.
2
Hydrostatic testing Pressure testing to the specified level to confirm structural integrity and leak tightness.
3
Non-destructive testing Eddy current, ultrasonic, radiographic, magnetic particle, dye penetrant and visual inspection.
4
Destructive testing Tensile, flattening, flaring, hardness and metallographic examination on sample coupons.
5
Dimensional checking Wall thickness, outside diameter, length, straightness and ovality on every production lot.
EN 10204 3.1 and 3.2 certificates as standard • third-party inspection on request • www.xtd-ss.com
Certifications and Approvals 41 certificates and approvals in force across quality, pressure equipment, marine and regional schemes
41 certificates and approvals held 13 patents CPCIF qualified supplier
Quality and HSE
Pressure equipment
ISO 9001:2015 ISO 14001:2015 ISO 45001:2018
PED 2014/68/EU AD 2000 W0 China Manufacture Licence of Special Equipment
Class societies
Offshore and CIS
ABS Bureau Veritas DNV Lloyd's Register CCS
NORSOK M-650 CU-TR 032 (EAC) GOST
Class society approvals from ABS, Bureau Veritas, DNV and Lloyd's Register were completed in 2025, and NORSOK M-650 with CU-TR 032 in 2024, so XTD pipe qualifies for offshore, marine and CIS project supply.
www.xtd-ss.com
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd.
Industries That Use Our Stainless Steel Pipes Seamless pipe and tube specified where corrosion, pressure or temperature leaves no margin
Oil and gas
Petrochemical
LNG
Desalination
Downhole tubing, flow lines and highpressure transmission
Process piping, heat exchangers and reactor systems
Cryogenic transfer lines and liquefaction trains
Duplex and super duplex seawater and RO circuits
Marine and shipbuilding
Nuclear and defence
Mining and minerals
Power generation
Seawater systems, ballast and offshore module piping
Steam and instrumentation lines to tight tolerance
Slurry, acid and leach circuit piping
Boiler tubes, superheaters and steam lines
Seven application sectors are published on xtd-ss.com, with power generation supplied through boiler and superheater tube.
www.xtd-ss.com
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd.
Why Buyers Choose XTD Seamless Pipe A manufacturer with its own mills, its own stock and its own test house
A mill, not a trader
Sizes others skip
Two plants, two hot extrusion presses and more than 20 cold drawing and pilger lines, so pricing comes direct.
Up to 1016 mm outside diameter and 65 mm wall, including heavy wall sections and S32707 hyper duplex.
Stock on standard grades
Technical support
Common austenitic and duplex sizes are kept in stock, so repeat orders ship on a short lead time.
Engineers assist with grade selection, specification matching and application guidance before you order.
40+
60+
25,000 t
390+
Years manufacturing
Countries supplied
Produced each year
People employed
www.xtd-ss.com
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd.
Contact the Seamless Pipe Manufacturer Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. HEAD OFFICE
WORKS
TELEPHONE
EMAIL AND WHATSAPP
Room 302, Building 1, Longlian Mansion,
No. 209 Ruiyang Avenue, Xiping Street,
+86-577-88877003 +86-577-88877015
sales@xtd-ss.com info@xtd-ss.com
Longwan District, Wenzhou City, Zhejiang Province, China
Songyang County, Lishui City, Zhejiang Province 323400, China
+86-577-88877019 Fax +86-577-86635318
WhatsApp +86 137 7779 5658 Monday to Saturday
Request a quotation Send the grade, size, wall thickness, quantity and application. You receive a price, the available size range and a full technical data sheet. Most enquiries are answered within 24 hours, and bulk or long-term supply agreements are welcome.
Visit the website
www.xtd-ss.com
Stainless steel seamless pipes and tubes • 304, 316, 321, 310S, 904L, duplex, super duplex and nickel alloy • ASTM A312, A213, A269 • OD 6 to 1016 mm • www.xtd-ss.com