Over 30 years of experience
About us
Founded in 1989

Union Steel Industry Co., Ltd as member of United Steel Industry Group, specialized in steel pipe and pipe fittings designing, manufacturing, stocking and exporting in China. As one of the leading manufacturer of steel pipe products in China, Union Steel Industry Co., Ltd are committed to providing one-stop service to customers around the world.


Union Steel Industry Co., Ltd has leading technology of steel pipe production and research at home and abroad, advanced and complete testing facilities. Adhering to our principle of“quality first, win-win cooperation”, we are confident to supply customers with high quality products at very competitive prices.

More Details
Welded Steel Pipe,Carbon Steel Pipe,Seamless Steel Pipe,Stainless Steel Pipe,Coated Steel Pipe,Oilfield Tubular Goods,Pipe Fittings
  • Welded Steel Pipe,Carbon Steel Pipe,Seamless Steel Pipe,Stainless Steel Pipe,Coated Steel Pipe,Oilfield Tubular Goods,Pipe Fittings

    5000+

    Employees
  • Welded Steel Pipe,Carbon Steel Pipe,Seamless Steel Pipe,Stainless Steel Pipe,Coated Steel Pipe,Oilfield Tubular Goods,Pipe Fittings

    3500+

    Equipment
  • Welded Steel Pipe,Carbon Steel Pipe,Seamless Steel Pipe,Stainless Steel Pipe,Coated Steel Pipe,Oilfield Tubular Goods,Pipe Fittings

    20+

    Production Lines
  • Welded Steel Pipe,Carbon Steel Pipe,Seamless Steel Pipe,Stainless Steel Pipe,Coated Steel Pipe,Oilfield Tubular Goods,Pipe Fittings

    450+

    Safety Tools

PRODUCT CATEGORY

Product Category

Carbon Steel Pipe

Carbon steel pipe is made from an alloy of iron and carbon. It’s a strong, durable material resistant to corrosion and oxidation. Because of its strength and ability to withstand stress, carbon steel pipe is used in a variety of heavy-duty industries like infrastructure, ships, distillers, chemical fertilizer equipment, and liquids, gases, solids transportation. Union Steel can offer SAWL/LSAW Steel Pipe, SSAH/SSAWSteel Pipe, EFW/ERW Steel Pipe, SMLS Steel Pipe and Hollow Section in standard size or as customer’s requirement.

Product: ERW,LSAW,SSAW
Application: Used for Oil/Gas/Water transmission,Machinery Manufacturing
Size: ERW:OD:21.3-610mm,WT:1.8-22mm
LSAW:OD:323.9-1820mm,WT:5-50mm
SSAW:OD:219.1-2540mm,WT:3.2-25.4mm
Pipe Standard: API 5L  PSL1/PSL2    Gr.A,Gr.B,X42,X46,X52,X56,X60,X65,X70
ASTM A53: GR.A, GR.B, ASTM A500 JIS G3466,ASTM A252  ASTM A178
AN/NZS 1163   AN/NZS 1074,EN10219-1        EN10217-1,S275, S275JR, S355JRH, S355J2H

carbon steel pipe,erw steel pipe,lasw steel pipe,ssaw steel pipe,smls steel pipe,hollow section

Product Category

Seamless steel pipe

Product:Seamless steel tube, Line pipe, Boiler tube,Large Diameter Steel Pipe,Precision Pipe Machining Tubes

Production range:
Hot-rolled seamless pipe: outer diameter: Φ32-Φ356mm, wall thickness: 3-50mm; maximum length: 50m
Hot-expanded seamless pipe: outer diameter: Φ32-Φ356mm, wall thickness: 8-50mm
Cold-rolled seamless pipe: outer diameter: Φ20-Φ273mm, wall thickness: 1-32mm
Cold-drawn seamless pipe: outer diameter: Φ20-Φ273mm, wall thickness: 1-26mm; maximum length: 50m

Seamless Steel Pipe, CS SMLS Pipe, Seamless Carbon Steel Pipe, Seamless Pipe,Seamless Carbon Steel Pipe,Carbon Steel Seamless Pipe

Product Category

Oilfield Tubular Goods

Oilfield tubular goods of Union Steel is a collection of seamless rolled products consisting of Tubing and Casing, Slotted Pipe, Drill Pipe and Drill Collar, Pup Joint and Coupling, which are useful in the oil and gas production activities. These OTCG products are manufactured according to the specifications set by API. OCTG can be either seamless or welded and are available in different sizes and lengths.

Tubing pipe size

OD:  1.050inch - 4-1/2 inch

Casing pipe size:

OD:  4-1/2inch - 20inch

Drill Pipe

API 5DP, 2-3/8’’~6-5/8’’, E75/X95/G105/S135.

Coupling

API 5CT, 1.9’’-20’’, K55/N80/L80/P110, STC/LTC /BTC

Standard

API 5CT H40, J55, K55, M65, L80-1, N80-1, N80Q, C90, P110, Q125

Tubing/Casing pipe end

P—plain-end, N—non-upset, with threaded and coupled, U—external-upset, with threaded and coupled, I—whole joint or other special threads / S—short round thread, L—long round thread, B—buttress thread

Drill Pipe

API SPEC 5DP E75, X95, G105, S135

Pipe Length

R1, R2, R3 or based on client’s requirements


oilfield tubular goods

Product Category

Alloy Steel Pipe

Nickel-Copper Alloy Pipe:Outer Diameter: 8-2500mm, (3/8"-100"),Wall Thickness: 0.3-150mm,(SCH10-XXS)

Alloy Steel Pipe:Outside Diameter:1/8'' ~ 26'';Wall Thickness: SCH 30, 30, 40, 60, 80, 120, 140, 160, XS, XXS, STD

Aluminum steel pipe:Outside Diameter: 1/2’’mm - 750mm;Thickness: ≥0.3mm

Titanium alloy pipe:Outer Diameter:6-2500mm, (3/8"-100");Thickness:0.3-150mm,(SCH10-XXS)

Ends :Plain End, Beveled End, Thread End

Standard & Grade: ASTM A333, A335 P5/P9/P11/P22/P91, ASTM C70600, ASTM B280, ASTM B360, ASTM B111,EN1057, EN12375, BS EN22451, DIN 17175, JIS G3458, JIS H3300,  ASME SB163,  AS1432

Usage:In Petroleum, Aerospace, Chemical, Power, Boilers, Military Industry

Alloy Steel Pipes

Product Category

Coated Steel Pipe

Coated steel pipe means the pipe that is by the processing after the corrosion, which can effectively prevent or slow the steel pipe occurs in the course of transport and chemical or electrochemical reaction corrosion phenomena. Coated steel pipe can effectively prevent or slow down the corrosion of steel pipes to extend service life and reduce operating costs pipe. Union Steel is a supplier that can offer Galvanized Steel Pipe, FBE Coated Pipe, Epoxy Coated Pipe, 3LPE/3PE Coated Pipe and Concrete Coated Pipe.

Bare pipe

SSAW

LSAW

ERW

SMLS

Production Range

OD:219mm-3120mm
WT: 3mm - 25mm

OD:16"-64"
WT: max 50mm

OD: 1/8"-24"
WT: max 26.5mm

OD: 1/8"-36"
WT: 1.25mm - 50mm

Length

Random Length   /   Fixed Length   /   SRL    /   DRL

Usage

Mechanical Tubing,Liquid Transport Steel Pipe,General structure, mechanical structure,Transport liquid, gas, oil

Coating Type

Galvanized Coating /Fusion bond Epoxy Coating/External Asphalt Enamel Coal Tar Epoxy /3PE /2PE/FBE/2FBE/3PP Varnish Coating
Bitumen Coating  / Black Oil Coating,Cement coated as per customer's requirement


coated steel pipe,galvanized steel pipe,fbe coated pipe,epoxy coated pipe,3lpe coated pipe,concrete coated pipe

Product Category

Stainless Steel Pipe

Stainless steel pipe is used for transporting liquids and gasses in a wide range of industries including mining, oil, natural gas, automotive, and aviation. Union Steel can provide Stainless Seamless Steel Pipe, Stainless Welded Steel Pipe, Stainless Steel Screen Pipe andStainless Hollow Sectionin standard sizes, or you can have it custom cut to your specifications.

ASTM

A312 TP 304 / 304L / 304H / 316 / 316L / 317 / 317L / 321 / 310 / 347 / 904L etc

Material

Duplex, Super Duplex, Monel, Nickel, Inconel, Hastelloy

Types

Round Seamless pipe, Square Seamless pipe, Rectangular Seamless pipe,Stainless Seamless Steel pipe,Stainless Steel Welded Pipe

Size

Upto 48” NB. (Seamless & Welded)

Wall Thickness

Sch. 5S to Sch. XXS

Steel Metal

Steel Coil,Steel Sheet,Steel Bar


stainless steel pipe,stainless seamless steel pipe,stainless welded steel pipe,stainless steel screen pipe,stainless hollow section

Product Category

Pipe Fittings

Pipe Fittings are defined as the piping components that help in pipe routing for directional changes, size changes, and branch connections. Union Steel is one of the top supplier of Flange, Elbow / Reducer / Tee / Cap / Bend and Valves, which are widely used in both the piping and plumbing industries.

Flange

1/2” - 120” ( DN 15 - DN 3000),Rating

150, 300, 400, 600, 900, 1500, 2500;

Elbow

Size Range

1/2” - 24” ( DN 21.3 - DN 610) for Seamless;26” - 96” ( DN 660 - DN 2438.4) for Welded.

Reducer

Size Range

1/2″ to 24″

Tee

Size Range

1/2” - 24” ( DN 21.3 - DN 610) for Seamless;26” - 72” ( DN 660 - DN 1828.8) for Welded.

Material

Carbon Steel ASTM A234 WPB,Alloy Steel ASTM A234 WP1, WP5, WP9, WP11, WP22,Stainless Steel ASTM A403 304/316

Type

Seamless / Welded


pipe fittings,plumbing fittings,flange,elbow,reducer,tee,cap,bend,valves

Product Category

Structural steel

H Section:Size:100*50-700*300mm;Web Thickness:5-16mm;Web Width:50--300mm;Flange Thickness:4.5-23mm;Flange Width:50-400mm;Length:1-12m or as customer request 

Channel Steel:Dimensions :50*37*4.5-400*104*14.5;75*40*3.8*7-152*76*6.4*9 ;140*60*7*10-200*75*8.5*11.5;Length:6m, 9m, 12m etc

Steel I Beam:Length: 1-12m, meet your requirements;Height : 100mm-320mm;Width : 37mm-132mm or as customer's request;Thickness:4.5mm-11.5mm

Steel Sheet Pile:Type: Z Type, U Type, Cold Formed, Hot Rolled;Standard: JIS A 5523 : 2012,JIS A 5528 : 2012,BS EN 10248-1 : 1996,BS EN 10248-2 : 1996,ASTM A572M/A572-12,ASTM A6/A6M-12

Steel Sheet Pile,Interlocking Sheet Pile,H Beam, I Beam, U Beam

Product Category

Value Added Products

Value added product has been enhanced with additional qualities that make it worth a higher price than the raw materials used to make it. It may be made more convenient, more attractive, more palatable, or easier to use than its raw ingredients. Union Steel can offer you Finned Tube, Pin Tube, Screen Pipe, Piling Pipe and Steel Sheet Pile.
value added products,finned tube,pin tube,screen pipe,piling pipe,steel sheet pile

Product Category

Steel Plate

Carbon steel Plate:Thickness:0.1mm-5000mm,etc  Width : 0.5mm-2.5m,etc Length: 1m-12m,or customized

Stainless Steel Plate:Thickness:0.01~200mm  ;Width:1000mm to 3500mm,etc   Length:2000mm to 6000mm,etc  

Aluminum Steel Plate:Thickness: 0.20mm - 500mm Width: 1000mm to 3800mm etc Length:1000mm - 12000mm

Carbon steel Plate,Mild Steel Sheet,Cold rolled steel plate ,Hot Rolled Carbon Steel Plate,High Carbon Steel Sheet

Product Category

Hollow Section

Square Steel Tube:Size: OD: 10*10-1000*1000mm
Rectangular Tube:OD: 20mm*10mm ~ 400mm*300mm
Surface:Bare/Painted/Light Oiled/Galvanized/Zinc Coating/Primering/Powder Coat




Square Hollow Section, SHS, Rectangular Hollow Section, RHS, Carbon Steel Square Tube, Carbon Steel Rectangular Tube

Our workshop

PROJECTS

Union Steel is committed to providing one-stop service for steel pipe products to customers around the world. Many years of large scale project experience in various fields.

LATEST NEWS

Details about GOST 20295 SSAW steel pipes

2025-06-09

GOST 20295 SSAW steel pipes,GOST 20295 spiral welded pipes
  • 06-06

    2025

    Overview of X46 SSAW steel pipe

    X46 spiral welded pipe is a high-strength, low-alloy steel pipe produced in accordance with API 5L X46 specifications. Known for its excellent mechanical properties and reliability, it is commonly used in oil and gas transmission, structural foundations, and water conveyance systems. The spiral submerged arc welding (SSAW) technique enhances its strength, flexibility, and cost-efficiency, making it suitable for high-pressure and long-distance pipeline projects. Here's an overview of X46 SSAW steel pipe.
  • 06-04

    2025

    The complete guide for X42 SSAW steel pipe

    X42 SSAW (Spiral Submerged Arc Welded) steel pipe is a high-strength, low-alloy pipeline product manufactured in accordance with API 5L X42 standards, which owns excellent mechanical properties and structural performance, making it an ideal choice for oil and gas transmission, water transportation, and foundation piling. Here is a complete guide for X42 SSAW steel pipe.
  • 06-03

    2025

    DIN 17175 seamless steel pipes for high-temperature applications

    DIN 17175 steel pipes are specifically designed for use in elevated temperature environments. Union Steel supplies a range of steel grades under this standard, including St35.8, St45.8, 15Mo3, 13CrMo44, and 10CrMo910. These seamless pipes are manufactured from carbon and low-alloy steels known for their strength and resistance to high pressure and temperature conditions. Here's an overview of DIN 17175 seamless steel pipes for high-temperature applications.
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