Q235B Galvanized Round Pipe | ASTM A53 Gr.A S235JR STPG370 Hot Dip Galvanized Steel Tube

Multi-standard equivalent grade: Q235B, ASTM A53 Gr.A, S235JR, STPG370 for global project matching
Good comprehensive performance, versatile for water delivery and fire protection piping systems
Uniform hot-dip galvanized coating, long-term rust resistance for indoor & outdoor applications
Excellent weldability and cutting performance, easy for on-site installation and connection
Complete size range, custom cut lengths, stable dimension tolerance

Product Overview

Our Q235B Galvanized Round Pipe is hot dip galvanized welded carbon steel pipe. The base grade Q235B is equivalent to ASTM A53 Gr.A (American standard), S235JR (EN European standard), and STPG370 (JIS Japanese standard). This general-purpose galvanized round pipe features balanced mechanical properties, and the hot-dip galvanized layer firmly bonds with the steel substrate to resist corrosion and oxidation. It is widely adopted for water pipelines, fire protection piping, municipal engineering, general structural frames and utility projects. We supply a full range of outer diameter and wall thickness options, support cut-to-length service, all pipes are inspected strictly before shipment with MTC provided.

Galvanized Round Pipe

Chemical & Mechanical Property Snapshot

Item	Q235B (ASTM A53 Gr.A / S235JR / STPG370)
Carbon (C)	≤0.22%
Manganese (Mn)	≤1.40%
Phosphorus (P)	≤0.045%
Sulfur (S)	≤0.050%
Yield Strength	≥235 MPa
Tensile Strength	370 – 500 MPa
Elongation	≥25%

Detailed Technical Specifications

Specification	Details
Product Name	Galvanized Round Pipe
Grade	Q235B, ASTM A53 Gr.A, S235JR, STPG370
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 finish
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, wrapped with waterproof plastic film

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 standards does Q235B galvanized round pipe comply with?

Q235B base material is equivalent to ASTM A53 Gr.A, EN S235JR and JIS STPG370. It meets multi-national standards to satisfy different country project requirements.

Can Q235B galvanized pipe be used for fire fighting pipelines?

Yes, it is a general-purpose galvanized pipe widely used for water supply and fire protection pipelines.

What is your minimum order quantity?

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

Can you cut the galvanized pipe to custom length?

Yes, custom cutting service is available according to your project drawing requirements.

Will you provide mill test certificate?

Yes, MTC will be provided along with goods. Third-party inspection can be arranged upon request.

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Q235B Galvanized Round Pipe | ASTM A53 Gr.A S235JR STPG370 Hot Dip Galvanized Steel Tube