ASTM A53 Gr.B S275JR STK400 Galvanized Round Pipe For Construction & Fluid Transportation

Excellent hot-dip galvanized coating, superior anti-corrosion & rust resistance for long service life
Medium tensile strength, stable mechanical property for fluid transmission and building frame projects
Uniform zinc layer, good weldability and bending performance for easy on-site processing
Standard dimension tolerance, smooth pipe surface without burrs
Wide size range, customizable cutting length to meet diverse engineering requirements

Product Overview

Our ASTM A53 Gr.B S275JR STK400 Galvanized Round Pipe is hot-dip galvanized carbon steel round tube. It adopts ASTM A53 Gr.B base material, equivalent to EN S275JR and JIS STK400 grade. The galvanized coating tightly bonds with steel substrate to prevent oxidation and corrosion in humid and outdoor environments. This medium strength galvanized round pipe is commonly applied in fluid transmission pipelines, building frames, greenhouse structures, fence frameworks and municipal engineering projects. We supply full size options, support cut-to-length service, strict inspection before shipment to guarantee consistent quality.

Galvanized Round Pipe

Chemical & Mechanical Property Snapshot

Item	ASTM A53 Gr.B / S275JR / STK400
Carbon (C)	≤0.30%
Manganese (Mn)	≤1.20%
Phosphorus (P)	≤0.045%
Sulfur (S)	≤0.050%
Yield Strength	≥245 MPa
Tensile Strength	415 – 540 MPa
Elongation	≥20%

Detailed Technical Specifications

Specification	Details
Product Name	Galvanized Round Pipe
Grade	ASTM A53 Gr.B, S275JR, STK400
Manufacturing Method	Hot Dip Galvanized Welded Steel Pipe
Zinc Coating Weight	85–120 g/m² (Customizable)
Outer Diameter	21.3mm – 219.1mm
Wall Thickness	2.0mm – 8.0mm
Length	3m, 6m, 12m or custom cut length
Surface	Hot dip galvanized, silver grey
MOQ	5 Tons
Production Lead Time	15–20 working days after deposit
Payment Term	T/T, L/C at sight
Inspection	Mill Test Certificate (MTC), Third-party inspection acceptable
Package	Bundled with steel strips, waterproof plastic cover

Dimension Table

DN	NPS	Outside Diameter (mm)	Sch40 Wall Thickness (mm)	Sch80 Wall Thickness (mm)
DN15	1/2″	21.3	2.75	3.73
DN20	3/4″	26.9	2.75	3.91
DN25	1″	33.7	3.25	4.55
DN32	1-1/4″	42.4	3.25	4.85
DN40	1-1/2″	48.3	3.50	5.08
DN50	2″	60.3	3.65	5.54
DN65	2-1/2″	73.0	5.16	7.01
DN80	3″	88.9	4.55	7.62
DN100	4″	114.3	4.50	8.56
DN125	5″	139.7	5.00	9.52
DN150	6″	168.3	4.50	11.13
DN200	8″	219.1	6.30	12.70
DN250	10″	273.0	6.30	12.70
DN300	12″	323.9	6.35	12.70
DN350	14″	355.6	7.94	12.70
DN400	16″	406.4	8.80	12.70
DN450	18″	457.2	10.00	17.20
DN500	20″	508.0	10.00	17.20
DN600	24″	609.6	Customized	Customized

Product Comparison Table

GB Grade	ASTM Grade	EN Grade	JIS Grade	Equivalent Feature
Q195	—	S195T	—	Low carbon, good ductility, suitable for greenhouses and light structures
Q215	—	—	—	Low carbon, excellent bending performance, suitable for fencing pipes
Q235B	ASTM A53 Gr.A	S235JR	STPG370	General purpose, widely used for water and fire pipelines
Q355B	ASTM A53 Gr.B	S355JR	STK490	High strength, suitable for heavy loads, guardrails, and steel structures
—	ASTM A53 Gr.B	S275JR	STK400	Medium strength, suitable for fluid transmission and building frames

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Fire Protection System Engineering

Low-Pressure Gas Transmission

Municipal Water Supply and Drainage Pipeline Network

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What does ASTM A53 Gr.B S275JR STK400 galvanized round pipe mean?

ASTM A53 Gr.B is the American standard grade, S275JR is EN European standard, STK400 is JIS Japanese standard. They are equivalent medium strength carbon steel base material for galvanized round pipe.

Is this hot dip galvanized pipe suitable for outdoor use?

Yes. Hot-dip galvanized layer provides reliable anti-rust performance, perfect for outdoor construction, fencing and fluid delivery projects.

What is your minimum order quantity?

MOQ is 5 tons. Mixed sizes within one order can be negotiated.

Can you cut the galvanized round pipe to custom length?

Yes, we support custom cutting service according to your project requirements.

Can you provide mill test certificate?

Yes, MTC will be provided together with goods. Third party inspection is available upon request.

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ASTM A53 Gr.B S275JR STK400 Galvanized Round Pipe For Construction & Fluid Transportation