China Q235B Steel Pipes Manufacturer

Q235B steel pipes are among the most widely used basic steel pipe materials in engineering construction, fluid transportation, and structural manufacturing.

Tianjin Juming Steel Pipe Co., Ltd., based in the Daqiuzhuang Steel Industry Base in Tianjin, China, is a professional steel pipe supplier and manufacturer. We have long focused on the production, processing, and export supply of steel pipes, and can stably provide products with various forming processes, including straight seam welded pipes, spiral welded pipes, straight seam submerged arc welded pipes, and seamless steel pipes, to meet the needs of different industries and working conditions.

Our Durable Q235B steel pipes strictly adhere to domestic and international standards such as GB, API, ASTM, and ISO. We can also provide material analysis, mechanical property testing, non-destructive testing, and third-party inspection reports according to customer project requirements. Our products are suitable for municipal engineering, oil and gas transportation, piling engineering, mechanical structures, and export engineering projects.

Commonly Used Standards for Q235B Steel Pipes

Juming Steel Pipes can provide a long-term, stable supply of Quality Q235B steel pipes conforming to the following standards:

GB/T 9711 / GB/T 9711.1 / GB/T 9711.2

1. Steel pipes for oil and gas industry transportation

SY/T 5037-2000

2. Spiral submerged arc welded steel pipes for general fluid transportation

SY/T 5040-92

3. Spiral submerged arc welded steel pipes for piling

API 5L (PSL1 / PSL2)

4. Internationally recognized pipeline steel standards

ASTM A36 / ASTM A53 / ASTM A106 (customizable)

Production can be carried out according to a single standard based on project requirements, avoiding the risk of mixed standards.

Product Types and Production Scope

We can provide the following types of High-Performance Q235B steel pipes:

1. Spiral Steel Pipe

Outer Diameter: 219mm – 3120mm

Wall Thickness: 3mm – 25mm

Applications: Municipal pipe networks, water pipelines, piling projects, large-diameter structural pipes

2. Straight Seam Steel Pipe

Outer Diameter: 16″ – 64″

Wall Thickness: ≤50mm

Applications: Oil and gas pipelines, high-pressure transmission, heavy engineering

3. Straight Seam Welded Pipe

Outer Diameter: 1/8″ – 24″

Wall Thickness: ≤26.5mm

Applications: Mechanical structures, general fluid transportation

4. Seamless Steel Pipe

Outer Diameter: 1/8″ – 36″

Wall Thickness: 1.25mm – 50mm

Applications: High pressure, precision structures, critical components

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Straight Seam Welded Pipe

At JuMing, we specialize in high-quality straight seam welded pipes, also known as longitudinal welded pipes, manufactured with precision for a variety of industrial applications. As a trusted China manufacturer and supplier, we offer fast sample delivery in 2 days and bulk shipment in 15 days, along with custom sizing and full technical support. Our reliable supply chain ensures your projects are completed efficiently and with confidence.

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Specialty Shape and Custom Structural Steel Tubing

At JuMing, we specialize in specialty shape and custom structural steel tubing. As a trusted China manufacturer and supplier, we provide customized steel solutions for a wide range of industries, from machinery manufacturing to automotive parts and construction. With advanced production equipment, skilled engineering, and full technical support, we ensure every project benefits from precision, reliability, and fast delivery.

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Zinc Aluminium Magnesium Coating Steel Pipe

Juming specializes in manufacturing Zinc Aluminium Magnesium Coating Steel Pipes, perfectly balancing durability, corrosion resistance, and cost-effectiveness. As a trusted manufacturer and supplier in China, we offer custom sizes, rapid sample delivery within 2 days, and bulk shipments worldwide within 15 days. With our technical support and global logistics network, we ensure your projects are executed efficiently, saving you time, costs, and effort.

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Low Carbon Steel Solid Square Bar

At JuMing, we are passionate about providing top-quality Low carbon steel solid square bars designed to meet the needs of diverse industries. With years of experience and a deep commitment to innovation, we deliver high-strength, precision-crafted products. Our China-based manufacturing facility ensures we maintain strict quality controls from raw material procurement to final product delivery. Whether you're in construction, automotive, or heavy machinery, we are the trusted supplier that provides steel tubes that last.
We respond to shipping requests within 48 hours, and regular orders are shipped out within 24 hours. Urgent orders can be processed through an expedited channel.

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Zinc-Aluminium-Magnesium Square Pipe

JuMing is a trusted China steel pipe manufacturer and supplier, specializing in Zinc-Aluminium-Magnesium square pipe. With nearly ten years of industry experience, our factory delivers high-quality, customizable steel products with fast production (samples in 2 days, shipment in 15 days) and global delivery, supported by full technical and after-sales service to help your projects run efficiently.

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Carbon Steel Rectangular Tubing

Tianjin Juming Steel Pipe, as a professional manufacturer and supplier in China, produces standard-specification Carbon Steel Rectangular Tubing, covering mainstream applications such as building structures and machinery manufacturing. It uses high-quality carbon structural steel such as Q235B and Q355B and low alloy steel as raw materials, and is produced by automated forming units to ensure product dimensional consistency and structural stability.

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Production Process and Quality Control

Juming Steel Pipe strictly implements full-process quality control during the production of Quality Q235B Steel Pipes:

Raw Materials: Selected high-quality strip steel coils, steel plates, welding wire, and flux

Forming Process: Cold bending / Spiral forming / Straight seam pressing

Welding Methods:

Double-wire double-sided submerged arc welding

High-frequency resistance welding (ERW)

Weld Inspection:

Online UT ultrasonic testing (100% coverage)

X-ray re-inspection (critical areas)

Finished Product Inspection:

Hydraulic pressure test

Outer diameter, wall thickness, and ovality inspection

End face beveling precision machining

All data is recordable, traceable, and reportable.

Surface Treatment

Supports multiple anti-corrosion and surface treatment solutions:

Black pipe

3PE anti-corrosion

Epoxy coal tar

FBE fusion bonded epoxy

Rust-preventive oil / varnish

Customized according to customer requirements

Main Application Areas

Municipal water supply and drainage engineering

Oil and natural gas transmission pipelines

Industrial liquid and gas transmission

Pile foundation engineering, bridge engineering

Steel structures and mechanical structures

Overseas engineering project export

Why choose Juming Steel Pipe?

1. Tianjin source factory, not a trading company

2. Years of experience in exporting Q235B steel pipes

3. Full specifications, multiple processes, one-stop supply

4. Complete testing, supports third-party re-inspection

5. Familiar with overseas project standards, efficient communication

As a reliable Q235B Steel Pipes manufacturer and supplier in China, we have our own factory. If you want to buy high-quality Steel Pipes, please contact us.

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