Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of uncoated black hfw straight pipe 76-660mm bulk wholesale from mill in China. Welcome to buy discount uncoated black hfw straight pipe 76-660mm bulk wholesale from mill made in China here from our factory. Quality products and low price are available.
Product introduction
Product Overview
Our uncoated black HFW straight steel pipes are factory direct bulk wholesale structural tubes without surface coating treatment. The outer diameter ranges from 76mm to 660mm, manufactured via high-frequency induction welding technology to meet global construction, infrastructure and mechanical engineering bulk procurement demands.
The pipes retain natural black oxide surface formed during hot forming, no anti-rust paint, galvanizing or other coating processes, cutting extra coating cost for clients who conduct secondary surface treatment on site. Stable weld performance, precise dimensional accuracy and large daily production capacity support large-volume bulk orders from engineering contractors, steel distributors and project developers worldwide.
This series of black HFW straight pipes is widely matched with ASTM A500 Grade B, ASTM A53 Grade B and other mainstream structural steel standards, suitable for mass supply to domestic and overseas construction projects with flexible customization of wall thickness, length and pipe end processing.
Production Process
Hot Rolled Coil Slitting Low carbon hot rolled steel coils are slit into uniform strips with stable chemical composition controlled strictly according to designated material standards.
Continuous Cold Roll Forming Multi-pass rolling units shape steel strips into round tube blanks, ensuring consistent roundness and straightness of finished pipes.
High Frequency Welding (HFW) Non-contact high-frequency induction heating completes longitudinal straight seam welding. Narrow heat-affected zone delivers uniform weld strength without obvious welding stress.
Internal & External Weld Bead Trimming Protruding weld beads inside and outside pipes are fully removed for smooth tube surface and uniform wall thickness.
Online Sizing & Straightening Pipes pass sizing and straightening machines to control OD, wall thickness and linear straightness within standard tolerance range.
Full Inspection Every pipe is tested by eddy current non-destructive flaw detection and hydrostatic pressure test to eliminate internal welding defects.
Fixed/Random Length Cutting Cut to random lengths of 6m/12m or customized fixed lengths as bulk order requirements.
Natural Black Surface Finishing No additional coating process, only simple cleaning to keep original black oxide surface of steel pipe.
Batch Sampling Test Tensile, flattening, bending and chemical composition tests are carried out on sampled pipes before bulk delivery.
Technical Parameters
Executive Standard
Optional Standards: ASTM A500 Gr.B, ASTM A53 Gr.B Welding Process: HFW High Frequency Longitudinal Straight Welded Surface Status: Uncoated Black Original Surface Supply Mode: Factory Direct Bulk Wholesale
Dimension Range
Outer Diameter: 76mm – 660mm Wall Thickness: 2.0mm – 25.4mm, customized SCH wall thickness available for bulk orders Length Options: Standard random length 6m, 12m; customized fixed length 1.5m–18m Dimensional Tolerance: Meet standard OD, wall thickness, straightness and roundness tolerance requirements
Material Mechanical Performance (ASTM A500 Gr.B Reference)
Minimum Yield Strength: 290MPa Minimum Tensile Strength: 400MPa Minimum Elongation: 21%
Surface Feature
Uncoated black oxide surface without paint, oil, zinc or anti-corrosion coating; slight natural rust-proof oil can be added upon customer request.
Core Product Advantages
Factory Direct Bulk Supply Complete production line and large inventory support full container and bulk vessel wholesale orders, stable delivery cycle for mass project procurement.
Cost-Effective Uncoated Design No extra coating manufacturing cost, lower unit price for clients who perform painting, galvanizing, epoxy coating and other secondary processing by themselves.
Reliable HFW Weld Quality High-frequency straight weld owns high weld integrity, full-length NDT inspection guarantees zero hidden welding defects for heavy-load structural use.
Complete Size Specifications Full OD coverage 76–660mm covers most common structural pipe sizes, realizing one-stop bulk purchasing for distributors and engineering projects.
Strong Customization Capacity Support customized wall thickness, fixed cutting length, pipe end chamfering, burr removal and small batch trial orders before large wholesale cooperation.
Stable Raw Material Source Long-term cooperative steel mill raw material supply ensures consistent chemical composition and mechanical properties of each batch bulk goods.
Easy Secondary Treatment Smooth uncoated black surface features good adhesion for subsequent spray painting, powder coating, hot-dip galvanizing and anti-corrosion lining construction.
Main Application Fields
Large-scale construction steel frame bulk supporting structure
Municipal infrastructure, bridge support and guardrail engineering
Factory workshop, warehouse and logistics park steel structure projects
Mechanical equipment frame, agricultural facility support pipe
Overseas EPC engineering bulk steel pipe procurement
Steel trading distributors secondary processing and resale
Temporary construction support, scaffold and building foundation pipe
Packaging & Shipment for Bulk Wholesale
Packaging: Bundled by steel packing strips; plastic pipe caps installed at both ends to avoid foreign matter blocking pipe cavity.
Surface Protection: Only thin anti-rust oil can be added optionally; standard products keep uncoated black original surface.
Shipping Mode: Suitable for full container FCL shipment and bulk vessel bulk cargo transportation for super large wholesale orders.
Loading: Professional loading team to avoid pipe deformation and surface scratch during container or bulk ship loading.
Custom Packaging: Special bundled weight, mark printing and export standard packaging can be customized according to long-term wholesale clients' demands.
Factory Quality & Wholesale Service
Strict ISO production management system runs through all production procedures.
Full set of official mill test certificates (MTC), NDT inspection records and delivery reports provided with bulk shipment.
Accept third-party inspection such as SGS, BV before loading for large overseas wholesale orders.
Flexible MOQ: Support mixed-size bulk container orders and large-volume long-term framework supply contracts.
Professional foreign trade team provides one-stop service including quotation, production tracking, inspection arrangement and export document handling for wholesale clients.
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.
Certifications
API 2B
API 5L
GOST
ISO 9001
EN 10219
EN 10210
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