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ASTM A36 Q235B ERW Round Black Welded Carbon Iron Steel Tube/Pipes
ASTM A36 Q235B ERW Round Black Welded Carbon Iron Steel Tube/Pipes are high-performance structural Steel pipe crafted via Electric Resistance Welding (ERW) technology—ensuring tight weld seams, uniform wall thickness, and exceptional structural integrity. Made from premium low-carbon steel (ASTM A36/Q235B), the pipes boast excellent ductility, weldability, and mechanical strength (tensile strength: 400-550 MPa; yield strength: ≥235 MPa), making them ideal for load-bearing and general-purpose applications.
Compliant with international standards including ASTM A500, EN 10217-7, and GB/T 3091-2015, the pipes feature a blacck oxide finish that enhances corrosion resistance and surface hardness. Regular specifications cover outer diameters from 12.7mm to 325mm, wall thicknesses from 1.2mm to 12mm, and lengths from 6m to 12m—with full customization available for special diameters, thicknesses, and lengths to meet unique project requirements. The ERW process ensures consistent zinc layer adhesion (where applicable for enhanced corrosion protection) and eliminates structural defects, delivering reliability for both indoor and outdoor use.
● Proven Brand Strength: With over 20 years of professional steel pipe manufacturing experience, YTDR Group is a certified supplier for 600+ global clients, including top 50 construction firms and mechanical manufacturers in Europe, Asia, and North America.
● Advanced Production Advantages: Equipped with 15 automated ERW production lines and 3 smart quality inspection systems, we achieve a monthly output of 5,000+ tons and a production cycle of 7-10 days—30% faster than industry averages.
● Strict Quality Control: Every pipe undergoes 3 rounds of rigorous testing (ultrasonic weld inspection, mechanical property testing, corrosion resistance assessment) before delivery, maintaining a 0-defect rate for 8 consecutive years.
● Superior Cost-Efficiency: By optimizing raw material sourcing and production processes, YTDR’s pipes reduce customers’ total lifecycle costs by 15%-25% compared to competitors, with no compromise on quality.
● Comprehensive Service Support: We offer 24-hour quotation responses, free technical consulting, and on-site installation guidance. Our after-sales team resolves issues within 48 hours globally, supported by 5 regional warehouses for fast delivery.
YTDR’s unique edge lies in flexible customization (minimum order quantity of 5 tons) and one-stop solutions—from design optimization to logistics arrangement—tailored to meet both small-batch and large-scale procurement needs.
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Advantage Dimension |
Specific Details |
Customer Value |
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Brand Strength |
Over 20 years of professional steel pipe manufacturing experience; 600+ global cooperative customers (including top construction/mechanical enterprises in Europe, America and Asia) |
Relying on mature industry accumulation, cooperation is more reliable and supply chain risks are reduced |
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Production Advantages |
15 automated ERW production lines with a monthly output of 5,000+ tons; 7-10 day production cycle (30% faster than the industry average) |
Quickly respond to order demands, shorten project delivery cycles, and enhance customers' market competitiveness |
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Quality Control |
3 rounds of inspections before delivery (ultrasonic weld inspection, mechanical property testing, corrosion resistance assessment); 0 defect rate for 8 consecutive years |
Stable product quality reduces after-sales failures, and cuts down maintenance costs and potential safety hazards |
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Cost-Efficiency |
Optimized supply chain and production processes, total lifecycle cost 15%-25% lower than peers |
Directly reduce procurement and usage costs, and improve customers' profit margins |
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Service Guarantee |
24-hour quotation response, free technical consulting, 48-hour global after-sales problem resolution; fast delivery from 5 regional warehouses; flexible customization with a minimum order quantity of 5 tons |
One-stop service covers the entire procurement process, meets personalized needs, and ensures worry-free after-sales |
The service life of YTDR’s ASTM A36 Q235B ERW Round Black Welded Carbon Iron Steel Tubes varies by environment, outperforming ordinary uncoated steel pipes by 2-3 times:
● Rural/low-pollution indoor environments: 30+ years
● Urban/outdoor general environments: 20-25 years
● Coastal/high-salt fog environments: 15-18 years
● Industrial medium-corrosion environments: 12-15 years
This longevity stems from two core advantages: First, the high-quality Q235B/ASTM A36 low-carbon steel base material ensures excellent toughness and resistance to stress corrosion. Second, the black oxide finish (or optional hot-dip galvanizing with 85μm+ zinc layer) forms a dense physical-chemical barrier, preventing moisture and corrosive substances from contacting the steel substrate.
A notable case: A Southeast Asian customer used YTDR’s pipes for outdoor warehouse frames in 2012. After 12 years of exposure to high humidity and occasional salt spray, the pipes showed no signs of rust or structural deformation, still meeting operational safety standards.
YTDR Group’s ASTM A36 Q235B ERW round black welded carbon steel pipes are manufactured through a strictly controlled, automated process with 8 core stages, each accompanied by quality checkpoints to ensure precision and reliability:
Customize Your Iron Round Tubes: Grade, Shape, and Size
● Customization Options:
Custom-Shaped Square Steel Pipes – Tailored to Your Needs Yuantai Derun provides fully customizable quare steel pipes to match your unique shape specifications.
● Our standard shaping options include:
● Inner & outer right angles (sharp-cornered design)
● Inner & outer arc angles (rounded edges)
● Inner arc with outer straight edges
● Inner straight edges with outer arc
YTDR’s ASTM A36 Q235B ERW Round Black Welded Carbon Iron Steel Tubes are widely used across multiple industries, leveraging their strength, weldability, and cost-effectiveness:
● Construction Industry: Used for steel structure workshop columns, outdoor billboard brackets, building scaffolding, and bridge auxiliary structures. The pipes’ high load-bearing capacity and corrosion resistance adapt to long-term outdoor exposure.
● Mechanical Manufacturing: Applied in machine tool frames, conveyor support beams, agricultural machinery components, and equipment casings. Their uniform wall thickness ensures precise fitting and stable operation.
● Transportation Sector: Utilized for automobile chassis frames, trailer structural parts, and railway auxiliary facilities. The lightweight yet durable 特性 reduces fuel consumption while ensuring safety.
● Agriculture & Irrigation: Employed in farm greenhouse frames, irrigation pipeline systems, and livestock shed supports. The black oxide finish resists moisture and soil corrosion.
● Infrastructure Projects: Selected for urban water supply pipelines, subway station platform structures, and power transmission tower accessories. Compliant with international standards, they meet strict project quality requirements.
● American Standard (ASTM): Gr. A, B, C, etc.
● European Standard (EN): S235, S275, S355, S420, S460, etc.
● Japanese Standard (JIS): SS400, STKR400, STKR490, etc.
● Chinese Standard (GB): Q195, Q235, Q355, etc.
● Canadian Standard (CSA): 300W, 350W, etc.
Free Square Steel Pipe Samples For You
At Yuantai Derun, we take pride in delivering premium square steel pipes. To let you experience our excellence firsthand, we’re pleased to provide free samples (up to 20 cm in length), shipped directly to you via express air freight—with only the shipping cost on your end.
Why hesitate? Put our materials to the test and discover why Yuantai Derun stands out in quality and reliability. Request your sample today!
Yuantai Derun Square Steel Pipes – Quality Assured at Every Stage
From raw material sourcing to finished products, Yuantai Derun implements rigorous quality control at every step. We exclusively use traceable raw materials from reputable manufacturers, subjecting them to comprehensive inspections, including but not limited to:
● Dimensional & Visual Checks (appearance, size, straightness)
● Mechanical Testing (impact resistance, yield & tensile strength, hardness)
● Material Analysis (chemical composition, metallographic examination)
● Non-Destructive & Corrosion Testing (UT inspection, salt spray testing)
Contact us today to discuss your specific testing requirements—we ensure precision and reliability in every pipe.
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Product Description |
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Outer Diameter |
21-219 mm |
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Wall Thickness |
2.8-22 mm |
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Length |
1-24M according to client requirement |
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Tolerance |
±5%, ±10% as required |
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Brand |
Yuantai Derun Steel Pipe Manufacturing Group |
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Model |
hfw-yt-Q235 Q345 16Mn |
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Surface Treatment |
Galvanized Coating |
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Zinc Coating |
275g/m2 |
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Standards |
Hollow section: ASTM A500/A501,EN10219,EN10210 |
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Certificate |
CE,LEED,BV,PHD&EPD,BC1,EN10210/10219, ISO9000/14001/45001,DNV,ABS,JIS G3466 |
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Brand |
Yuantai Derun or OEM |
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MOQ |
2-5 Tons or No minimum order |
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Delivery Time |
7-30 days |
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Samples |
Free Samples Get Free Sample Now! |
