Q195 Q235B Q355B ASTM A53 Gr.B EN S235JR ERW Carbon Steel Welded Pipe | GB/T 3091 EN 10219 Electric Resistance Welded Tube

High‑speed ERW electric resistance welding, consistent wall thickness, excellent dimensional accuracy
Multi‑grade combination covers general structural & low‑pressure fluid transport requirements
Cost‑effective, short production lead‑time for small and medium diameter steel pipe orders
Compliant with GB/T3091, ASTM A53, EN 10219 international standards for global project acceptance
Support cutting, beveling, threading, galvanizing, anti‑corrosion coating custom processing

Product Overview

Q195, Q235B, Q355B, ASTM A53 Gr.B and EN S235JR ERW Carbon Steel Welded Pipe are electric resistance welded tubes produced by high‑frequency ERW forming & welding process. Flat steel strip is continuously roll‑formed into circular shape, then welded by resistance heating without filler metal. After welding, pipe goes through sizing, straightening, weld seam annealing, non‑destructive weld inspection and hydrostatic pressure test.

Q195 features good ductility for light‑duty structures and cable conduits. Q235B / EN S235JR is the mainstream general‑purpose grade for scaffolding, building frames and potable water pipeline. Q355B delivers higher yield strength for heavy‑load structural applications. ASTM A53 Gr.B provides widely‑accepted international grade for export engineering projects.

This ERW pipe series is widely used for cable conduit sleeves, potable water supply, drainage systems, scaffolding frames, general steel structures, low‑pressure fluid conveyance and agricultural greenhouse framework.

Carbon Steel Welded Steel Pipe

Chemical & Mechanical Property Snapshot

Item	Q195 ERW	Q235B / S235JR ERW	Q355B ERW	ASTM A53 Gr.B ERW
Carbon(C)	≤0.12%	≤0.22%	≤0.20%	≤0.30%
Manganese(Mn)	0.30‑0.60%	0.30‑0.80%	1.00‑1.60%	≤1.20%
Silicon(Si)	≤0.30%	≤0.35%	≤0.50%	—
Sulfur(S)	≤0.045%	≤0.045%	≤0.040%	≤0.045%
Phosphorus(P)	≤0.045%	≤0.045%	≤0.040%	≤0.045%
Min Yield Strength(MPa)	195	235	355	240
Tensile Strength(MPa)	315‑430	375‑500	470‑630	≥415
Min Elongation	≥22%	≥21%	≥20%	≥20%
Bend / Weld Test	Pass	Pass	Pass	Pass
MOQ	5 Metric Tons	5 Metric Tons	5 Metric Tons	5 Metric Tons
Lead Time	15‑20 working days	15‑20 working days	15‑20 working days	15‑20 working days

Detailed Technical Specifications

Item	Details
Product Name	Q195 Q235B Q355B ASTM A53 Gr.B EN S235JR ERW Carbon Steel Welded Pipe
Welding Type	ERW (Electric Resistance Welded)
Applicable Standards	GB/T 3091, ASTM A53, EN 10219
Material Grades	Q195, Q235B, Q355B, ASTM A53 Gr.B, EN S235JR
Outer Diameter	12.7 mm ‑ 610 mm
Wall Thickness	0.8 mm ‑ 20 mm
Standard Length	6 m / 12 m, custom cut‑to‑length available
Pipe End	Plain end, bevel end, threaded end
Surface Option	Black bare, varnish, hot‑dip galvanized, 3PE anti‑corrosion
Inspection	Weld seam UT / ET, hydrostatic test, dimensional inspection
Documentation	Mill Test Certificate (MTC)
MOQ	5 Ton
Payment Terms	T/T, L/C at Sight
Delivery Time	15‑20 working days after receiving deposit
Package	Waterproof paper + galvanized steel strap + seaworthy export wooden pallet

Shape Table

Shape Type	Description	Applicable Pipe Type
Round / Circular Tube	Standard circular cross-section, most widely used	ERW, SSAW, LSAW Carbon Welded Pipe
Straight End	Plain ends, no threading, cut flat	ERW, SSAW, LSAW
Beveled End	30° / 37.5° welding bevel for butt welding	SSAW, LSAW (large-diameter pipeline)
Threaded End	Thread + coupling for connection	Small-size ERW pipe
Grooved End	Groove for mechanical coupling connection	Medium-size ERW pipe for fire & water systems
Cut to Fixed Length	6 m, 12 m, or custom fixed cut length	ERW / SSAW / LSAW

Dimension Table

Pipe Type	Outer Diameter Range	Wall Thickness Range	Standard Length	Tolerance
ERW Welded Pipe	12.7 mm–610 mm	0.8 mm–20 mm	6 m / 12 m	OD ±0.5%, WT ±10%
SSAW Spiral Welded Pipe	219 mm–3620 mm	5 mm–25.4 mm	6 m / 12 m or custom	OD ±1.0%, WT -5% to +12.5%
LSAW Longitudinal Welded Pipe	406 mm–1626 mm	6 mm–50 mm	6 m / 12 m or custom	OD ±0.75%, WT -5% to +10%

Product Comparison Table

Product Grade Group	Manufacturing Process	Main Standards	Size Range	Typical Applications	Selection Advantage
Q195 ERW	ERW Electric Resistance Welded	GB/T3091	OD12.7‑610mm WT0.8‑20mm	Cable conduit, light greenhouse frame	Low cost, excellent cold bending performance
Q235B / S235JR ERW	ERW Electric Resistance Welded	GB/T3091, EN10219	OD12.7‑610mm WT0.8‑20mm	Scaffolding, water supply, general building structure	Balanced strength & weldability, most popular general grade
Q355B ERW	ERW Electric Resistance Welded	GB/T3091, EN10219	OD12.7‑610mm WT0.8‑20mm	Heavy‑load structural frame, support column	High yield strength for heavy‑duty projects
ASTM A53 Gr.B ERW	ERW Electric Resistance Welded	ASTM A53	OD12.7‑610mm WT0.8‑20mm	International export construction & fluid piping	Fully comply with American standard for overseas tender

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Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What is ERW welded pipe used for?

ERW pipe is widely used for scaffolding, potable water supply, drainage, cable conduits, greenhouse frames and low‑pressure fluid transportation.

What is difference between Q235B and Q355B ERW pipe?

Q355B owns much higher yield strength, it is selected for heavy‑load structural components; Q235B is economical for general‑purpose construction.

Can you supply galvanized ERW steel pipe?

Yes, we can provide hot‑dip galvanizing, pre‑galvanized and other anti‑corrosion surface treatment.

What inspection will be carried out for ERW pipe?

Every pipe will do hydrostatic pressure test and weld seam non‑destructive test, MTC will be offered. Third‑party SGS / BV inspection is acceptable.

What is your MOQ for ERW welded pipe?

MOQ is 5 metric tons for standard sizes. Small trial order can be negotiated.

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Q195 Q235B Q355B ASTM A53 Gr.B EN S235JR ERW Carbon Steel Welded Pipe | GB/T 3091 EN 10219 Electric Resistance Welded Tube