Product

Grade

Specification （mm）

Use

Executive Standard

Welded Steel Pipe

Longitudinal Electric Welded Pipe

Q195、Q235A、Q235B、Q355B

Φ20×2.0～Φ610×20.0

Building structures, guardrails, Brackets, low-pressure fluid Transportation

GB/T 13793

Spiral Welded Pipe

L245、L290、L360、L415

Φ219×6～Φ3000×25

Water Conservancy Projects and structural supports

GB/T 9711、SY/T 5037

Seamless Steel Pipe

Structural Seamless Steel Pipe

10#、20#、45#、Q355B

Φ10×1.5～Φ530×40

Mechanical structures, vehicle chassis, Shafting, and Brackets.

GB/T 8162

Fluid Conveyance Seamless Steel Pipe

20#、Q345B、L245

Φ10×1.5～Φ530×40

Medium and Low-Pressure Transportation of Water, Gas, and Oil.

GB/T 8163

High-Pressure Boiler Seamless Steel Pipe

20G、15CrMoG、12Cr1MoVG

Φ16×2.5～Φ530×80

Power Plant boilers, high-pressure vessels, superheaters

GB 5310

Hydraulic Prop Seamless Steel Pipe

27SiMn

Φ70×10～Φ300×40

Hydraulic Supports for Coal Mines and Hydraulic Cylinders.

GB/T 17396

Cold-Drawn Precision Seamless Steel Pipe

10#、20#、45#

Φ6×1～Φ120×10

Precision instruments, air cylinders, hydraulic systems

GB/T 3639

Square & Rectangular Tube

Welded Square Tube

Q235B、Q355B

□30×30×2.0～□400×400×20

Building frameworks, steel structures, display racks, guardrails

GB/T 6728

Welded Rectangular Tube

Q235B、Q355B

▭50×30×2.0～▭500×300×20

Factory building columns, door/window frames, machinery bases

GB/T 6728

Cold-Formed Square & Rectangular Tube

Q235B、Q355B

□20×20×1.5～□200×200×8

Lightweight structures, Architectural Decoration, furniture

GB/T 6725

Galvanized Steel Pipe

Hot-Dip Galvanized Steel Pipe

Q235A、Q235B

DN15～DN600

Water and Gas Transportation, Construction Scaffolding, and Guardrails.

GB/T 3091

Hot-Dip Galvanized Square & Rectangular Tube

Q235B、Q355B

□40×40×2.0～□200×200×6

Outdoor structures, Fences, Advertising Racks, sunrooms

GB/T 6728

Stainless Steel Pipe

Stainless Steel Welded Pipe

304、316、316L

Φ10×1.0～Φ2000×10

Food machinery, decorative tubes, fluid Transportation

GB/T 12771

Stainless Steel Seamless Pipe

304、316、321

Φ6×1.0～Φ325×30

Chemical equipment, heat exchangers, high-pressure environments

GB/T 14976

Stainless Steel Square & Rectangular Tube

304、316

□10×10×0.8～□150×150×6

Decorative structures, handrails, Showcases, doors/windows

GB/T 6728

Alloy Steel Pipe

Low-Temperature Alloy Steel Pipe

16MnDG、09Mn2VDG

Φ25×3.0～Φ426×40

Low-temperature equipment, liquefied gas storage tanks

GB/T 18984

Corrosion-Resistant Alloy Steel Pipe

15CrMo、12Cr1MoV

Φ25×3.0～Φ426×40

High-temperature & high-pressure environments, petrochemical equipment

GB 9948、GB 5310

Ductile Iron Pipe

Straight Pipe

K9

DN80～DN2600

Used in municipal water supply, drainage,and gas pressure piping systems. Features high pressure resistance, corrosion resistance, and long service life.

GB/T 13295、GB/T 26081、ISO 2531

Jacking Pipe (Pipe Jacking)

K9、K10

DN600～DN2600

Suitable for trenchless construction (pipe jacking method) to cross roads, railways, and rivers, featuring a reinforced pipe structure.

GB/T 13295、GB/T 26081、T/CFA 02010202.4

Microtunneling Pipe

K9

DN300～DN1000

Suitable for small-diameter, short-distance trenchless construction. Fast construction speed with minimal surface disruption.

GB/T 13295、GB/T 26081、T/CFA 02010202.4

Fittings

QT 400-18、QT 500-7

Customized as required

Ductile iron fittings including Crosses, Reducers, Elbows, Sleeves, Sludge Discharge Pipes, and Tees; used for pipe connection, redirection, diameter reduction, and branching.

GB/T 13295、ISO 2531