Hot-Dip Galvanized Steel Pipe – Q235B Threaded & Plain End

QIDAMT · GALVANIZED PIPE

Q235B welded pipe hot-dip galvanized with threaded or plain ends for plumbing, conduit, fencing and structural use.

Hot-dip galvanized steel pipe is made from Q235B electric resistance welded pipe and coated by hot-dip galvanizing. The zinc layer protects both the outside surface and the pipe bore, giving long service in water, conduit and outdoor applications. Threaded and coupled ends are available for quick, leak-free joints.

Key Advantages

Threaded Option

Threaded & coupled for fast assembly.

Inside & Outside Coating

Zinc protects bore and outer surface.

Pressure Tested

Hydro-tested for water service reliability.

Easy to Cut & Join

Standard plumbing methods apply.

Chemical Composition (Q235B Base)

Element	C	Mn	Si	P	S	Fe
Content %	0.12 – 0.20	0.30 – 0.70	≤ 0.30	≤ 0.045	≤ 0.045	Balance

Mechanical Properties

Yield strength: ≥ 235 MPa
Tensile strength: 370 – 500 MPa
Elongation (δ): ≥ 26 %
Zinc coating: 45 – 85 μm (≥ 275 g/m²)
Hydrostatic test: 3.0 – 7.0 MPa

Standard Sizes

Parameter	Range
Nominal size	DN15 – DN200 (1/2″ – 8″)
Outside diameter	21.3 – 219.1 mm
Wall thickness	2.0 – 6.0 mm
Length	6 m standard, cut to order
End finish	Threaded & coupled / plain end / grooved
Standard	GB/T 3091 / EN 10255 / ASTM A53 / ISO 1461

Applications

Galvanized steel pipe is used for water supply and sprinkler lines, electrical conduit, fencing and handrail posts, scaffolding, greenhouse heating lines, air compressor piping, oil and gas field surface lines, and general mechanical and structural applications. For square and round tube profiles see our pre-galvanized square tube and hot-dip galvanized round tube.