About Us

Engineering-Grade Seamless Tubes and Pipes Manufacturer

Wezhou Gang Zhen Hui Pipeline Project And Engineering Co.,Ltd is a professional manufacturer of seamless stainless steel pipe, duplex stainless steel pipe, super duplex pipe, and nickel alloy pipe based in Zhejiang Province, China.

With over 30 years of manufacturing experience(was built in 1985),GZH supplies corrosion-resistant seamless pipes for oil & gas, petrochemical, offshore, LNG and power generation industries worldwide.

Seamless Pipe Product Range
We manufacture a wide range of seamless pipe and tube products, including:

Austenitic Stainless Steel Pipe
304 / 304L / 304H/310S / 310H/316 / 316L / 316H / 316Ti/317L/321 / 321H / 347 / 347H

Super Austenitic Stainless Steel Pipe
904L/S30815 (253MA)/S31254 (254SMO)/S32654（654SMO）

Duplex & Super Duplex Stainless Steel Pipe
UNS S31803/UNS S32205 (Duplex 2205)/UNS S32750 (Super Duplex 2507), UNS S32760/UNS S32550

Nickel Alloy Pipe
UNS N08800 (Incoloy 800)/UNS N08810 (800H)/UNS N08825 (825)/UNS N06600 (600)UNS N06625 (625)/UNS N04400 (Monel 400)/Alloy C276/Alloy C22/Alloy B2.

Custom sizes and cut-to-length services are available according to project requirements.

Manufacturing Capability of Seamless Pipes
GZH operates a complete seamless pipe production system including:
· Piercing
· Cold drawing and cold rolling
· Bright annealing heat treatment
· Straightening and finishing

With more than 20 cold drawing and cold rolling production lines, our annual production capacity reaches approximately 25,000 tons.

We maintain regular stock of common grades such as 304L, 316L, 2205, 2507, 904L, 254SMO, 625 and C276 to ensure fast delivery for international customers.

Large Diameter Seamless Pipe Production (Up to 1016 mm) Our subsidiary,
specializes in large diameter seamless stainless steel pipe production.

· OD Range :6mm to 1016 mm
· Annual capacity :25,000 tons


This facility supports offshore and project-based requirements for heavy wall and large OD seamless pipes.