Name: China ERW Carbon Steel Pipe For Earthquake-Resistant Structures Manufacturers Suppliers Factory - Huayang Steel Pipe
Brand: Huayang
SKU: 303004674

Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of erw carbon steel pipe for earthquake-resistant structures in China. Welcome to buy discount erw carbon steel pipe for earthquake-resistant structures made in China here from our factory. Quality products and low price are available.

Product introduction

Product Description

ERW Carbon Steel Pipe For Earthquake‑Resistant Structures is a high‑quality electric‑resistance welded structural steel pipe specially engineered for seismic‑resistant building frames, seismic bracing systems, bridge seismic supports, industrial plant seismic structures, underground seismic‑safe pipelines and critical infrastructure. Manufactured strictly to international structural steel standards including EN10219, ASTM A500, GB/T 3091, it adopts low‑carbon high‑toughness steel grades and high‑frequency ERW welding technology. Featuring excellent ductility, high impact toughness, stable weld integrity, outstanding fatigue resistance and seismic energy‑absorbing capacity, this pipe can withstand repeated vibration, bending deformation and ground displacement during earthquakes. Widely used in high‑rise buildings, hospitals, schools, transportation hubs and key seismic‑grade projects, it provides reliable structural safety for earthquake‑prone regions worldwide.

Basic Product Specifications

Product Name: ERW Carbon Steel Pipe For Earthquake‑Resistant Structures

Executive Standard: EN10219‑1, ASTM A500 Grade B/C, GB/T 3091‑2015, ISO 3183

Manufacturing Process: ERW (Electric Resistance Welding), strip cold forming, high‑frequency continuous welding, weld annealing, stress‑relieved heat treatment, full‑line NDT inspection

Steel Grade: Q235B, Q355B, S275JR, S355JR, S355J2 (seismic‑optimized low‑carbon, fine‑grain grades)

Outer Diameter (OD): 21.3 mm – 820 mm, DN50‑DN800 customizable

Wall Thickness (WT): 4 mm – 25 mm, heavy‑wall up to 30 mm for high‑seismic‑risk areas

Standard Length: 6 m, 9 m, 12 m, custom fixed lengths up to 15 m

Delivery Condition: Normalized + stress‑relieved, fine‑grain treatment for high ductility

Surface Finish: Black bare steel with anti‑rust oil; hot‑dip galvanized, epoxy primer, weather‑resistant coating for outdoor seismic structures

Pipe End: Plain ends for structural connection; 30°‑45° beveled ends for field full‑penetration welding

Application: Seismic bracing for high‑rise buildings, bridge seismic supports, industrial plant seismic frames, hospital & school seismic structures, underground seismic‑safe pipelines, power station & transportation hub structural components

Grade & Process Explanation

Seismic‑Optimized Steel Grade Performance: Low‑carbon fine‑grain carbon steel grades are selected for seismic structural use, balancing high strength, good ductility and excellent low‑temperature toughness. Q355B / S355JR are mainstream grades with yield strength ≥355 MPa and high elongation, enabling plastic deformation and energy absorption under seismic load without brittle fracture. Strict low‑sulfur (≤0.025%) and low‑phosphorus control eliminates brittle zones, improving seismic reliability under cyclic vibration.

ERW Process Advantages for Seismic Structures: High‑frequency ERW welding produces continuous, uniform welds without filler metal. Post‑weld annealing and stress relief eliminate residual stress, ensuring weld mechanical properties match the base metal perfectly. The smooth inner/outer surface avoids stress concentration under seismic bending and torsion. Compared with LSAW and seamless pipes, ERW pipes offer stable quality, high dimensional precision and cost‑effectiveness for large‑scale seismic structural construction.

Earthquake‑Resistant Special Design: Optimized for cyclic seismic loads, ground motion and plastic deformation. Strict roundness and straightness control ensure uniform force distribution in structural frames. Optional anti‑corrosion and weather‑resistant coatings adapt to outdoor, coastal and underground seismic environments, maintaining long‑term structural stability for decades.

Dimensional Tolerance (Structural Seismic Standard)

Item	Tolerance
Outer Diameter	±0.8% of nominal OD
Wall Thickness	+12% / −10% of nominal WT
Out‑of‑Roundness	≤0.8% of outer diameter
Straightness	≤1.5 mm per meter
Length	+150 mm / −0 mm

Mechanical Properties (Seismic‑Critical Requirements)

Property	Q235B / S275JR	Q355B / S355JR
Minimum Yield Strength	≥235 MPa	≥355 MPa
Tensile Strength	375–500 MPa	470–630 MPa
Elongation	≥26%	≥21%
Charpy Impact (‑20 °C)	≥27 J	≥34 J
Cyclic Fatigue Test	Pass seismic‑grade cyclic load test	Pass seismic‑grade cyclic load test
Flattening / Bend Test	No cracks, no weld separation	No cracks, no weld separation

Note: Low‑temperature impact and fatigue tests are mandatory for high‑seismic‑zone projects to prevent brittle failure during earthquakes.

Chemical Composition (Max. %, Seismic‑Grade)

Element	C	Mn	P	S	Si
Q235B	≤0.20	≤1.40	≤0.025	≤0.025	≤0.35
Q355B	≤0.22	≤1.60	≤0.025	≤0.025	≤0.55

Residual elements: Cu ≤0.30%, Ni ≤0.30%, Cr ≤0.30%. Low‑carbon design improves ductility and seismic energy‑absorbing performance.

Manufacturing Process

Raw Material Inspection: Strict chemical & mechanical testing of seismic‑grade low‑carbon steel strips, fine‑grain quality verification.

Strip Cold Forming: Precision forming to ensure uniform wall thickness and high roundness for even stress distribution.

High‑Frequency ERW Welding: Continuous full‑penetration welding with intelligent temperature control for uniform weld quality.

Weld Annealing & Stress Relief: Eliminate residual stress, refine grain structure, enhance ductility and seismic resistance.

100% NDT Inspection: Ultrasonic testing for weld defects; RT/TOFD optional for critical seismic projects.

Mechanical Performance Verification: Mandatory low‑temperature impact, fatigue and bend tests for seismic compliance.

Surface Treatment: Anti‑rust oil or custom anti‑corrosion coating for long‑term structural service.

Finishing: End processing, standard marking for seismic structural identification.

Product Advantages

High Seismic Energy‑Absorbing Capacity: Excellent ductility and plastic deformation performance, resisting seismic vibration and ground displacement without sudden fracture.

Stable ERW Weld Quality: Stress‑relieved welds match base metal performance, no weak points under cyclic seismic loads.

Low‑Carbon Fine‑Grain Material: Optimized for seismic safety, avoiding brittle failure in earthquake‑prone regions.

Strict Seismic‑Grade Testing: Pass low‑temperature impact, fatigue and cyclic load tests for critical infrastructure approval.

Wide Size Range: Covers small‑diameter bracing to large‑diameter main structural pipes for diverse seismic projects.

Cost‑Effective & High Precision: ERW production efficiency, stable dimensional accuracy, suitable for large‑scale seismic construction.

Complete Quality Traceability: MTR reports, SGS/BV third‑party inspection available for seismic engineering acceptance.

Main Applications

Seismic bracing & frame structures for high‑rise buildings

Seismic support components for highway & railway bridges

Seismic‑resistant frames for hospitals, schools, public safety buildings

Industrial plant and factory seismic structural supports

Underground seismic‑safe pipelines and tunnel auxiliary structures

Power stations, data centers and transportation hub seismic components

Coastal and high‑risk seismic zone permanent infrastructure

Quality Inspection & Certification

Full dimensional inspection of OD, wall thickness, straightness and roundness

Tensile, bend, flattening, low‑temperature impact and fatigue tests

100% ultrasonic weld inspection, RT/TOFD optional for critical projects

Heat‑batch chemical composition analysis for seismic‑grade purity

Mill Test Report (MTR), third‑party seismic compliance inspection available

Packaging & Delivery

Packaging: Bundled with heavy‑duty steel strips, wrapped in anti‑collision waterproof cloth, steel end caps for protection

Marking: ERW, Earthquake‑Resistant Structure Pipe, steel grade, size, heat number, batch number

Trade Terms: FOB, CIF, CFR, DAP

Shipping Ports: Tianjin, Qingdao, Shanghai, Ningbo

Customization: Custom wall thickness, anti‑corrosion coating, length and pipe‑end forms supported

Contact Us

For quotation, stock availability, delivery schedule and customized seismic‑grade solutions of ERW Carbon Steel Pipe For Earthquake‑Resistant Structures, please contact our sales team. We provide seismic‑optimized ERW steel pipes and professional structural technical support for earthquake‑prone region construction projects worldwide.

About us

Hebei Huayang Steel Pipe Co., Ltd. was founded in 2005, with a registered capital of 500 million yuan. The company covers an area of more than 1,000 mu, with annual sales of 10 billion yuan, more than 600 employees and an annual productivity of 2.75 million tons. The company has 17 new automatic steel pipe production lines and 14 high-frequency production lines, with a diameter of 73-660 mm; Three double-sided submerged arc welded steel pipe production lines with diameters of 406.4-1422.4mm;; 24 hot tube expanding production lines, with a diameter of 230-820mm; Two anticorrosion steel pipe production lines with a diameter of 73-1626 mm; 2 automatic painting production lines. With 3 branches and 5 offices, the products are sold to various cities and exported to more than 80 countries such as Southeast Asia, Middle East, Europe and America.

Packaging, transportation and delivery

Packaging, transportation and delivery

At Hebei Huayang Steel Pipe Co., Ltd., we apply standardized and reliable packaging solutions for all our steel pipe products. Our pipes can be securely packed by hexagonal bundling or circular bundling according to product diameter, wall thickness and customer requirements. Each pipe end is protected with high‑strength plastic pipe caps to avoid collision damage, dust and moisture during transportation and storage. The whole bundle is firmly wrapped with durable woven bags to enhance stability and prevent scratches or deformation.

We support a complete range of transportation methods to satisfy global customers, including road transportation, railway transportation, sea freight and container shipping. Based on our strategic location in Cangzhou, Hebei Province, we enjoy convenient access to major ports such as Tianjin Port, which greatly improves logistics efficiency and reduces transportation costs.

For standard specifications and normal order quantities, the general delivery time is about 30 days after order confirmation and deposit receipt. For large‑scale orders, special sizes or customized processing requirements, our production and sales team will formulate a detailed production plan and provide an accurate delivery schedule accordingly to ensure on‑time supply and stable performance for projects and clients worldwide.

Strict quality control

1. During and after the production, experienced quality inspectors randomly check the products to ensure that each steel pipe is qualified for production and application.

2. A nationally recognized laboratory with CNAS certification and certification by French Classification Society.

3. Have CNOOC access certificate, KOC oil company access network, ADNOC Abu Dhabi oil company access network, Petrobras access network, etc.

4. Accept the inspection by the third party designated/paid by the buyer, such as SGS and BV.