Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of erw carbon steel pipe for precision machinery piping in China. Welcome to buy discount erw carbon steel pipe for precision machinery piping made in China here from our factory. Quality products and low price are available.
Product introduction
Product Description
ERW Carbon Steel Pipe For Precision Machinery Piping is a high-precision electric-resistance welded carbon steel pipe specially engineered for precision machinery hydraulic systems, lubrication pipelines, cooling circuits, instrument connecting pipes, and precision equipment fluid transmission. Manufactured strictly to international precision piping standards including ASTM A106, EN10217-1, GB/T 8163, it adopts high-purity carbon steel strips and advanced high-frequency ERW welding technology with precision forming. Featuring ultra-high dimensional accuracy, smooth inner surface, stable weld integrity, excellent pressure resistance and corrosion resistance, this pipe can deliver stable, leak-free fluid transmission for precision machinery, ensuring the normal operation of equipment components. Widely used in CNC machine tools, precision instrumentation, industrial robots, aerospace auxiliary equipment, and high-precision hydraulic/pneumatic systems, it provides reliable and high-precision piping solutions for precision machinery industries worldwide.
Basic Product Specifications
Product Name: ERW Carbon Steel Pipe For Precision Machinery Piping
Executive Standard: ASTM A106 Grade B/C, EN10217-1, GB/T 8163-2018, ISO 11960
Manufacturing Process: ERW (Electric Resistance Welding), precision strip cold forming, high-frequency continuous welding, weld annealing, stress-relieved heat treatment, full-line NDT inspection, inner surface polishing
Steel Grade: 10# Carbon Steel, 20# Carbon Steel, ASTM A106 Gr.B, ST35.8 (high-purity, low-impurity precision grades)
Outer Diameter (OD): 10mm – 159mm, DN10-DN150 customizable (focus on small-to-medium caliber for precision piping)
Wall Thickness (WT): 1.5mm – 10mm, precision wall thickness tolerance for stable fluid flow
Standard Length: 3m, 6m, 9m, custom fixed lengths up to 12m (matching precision machinery installation space)
Delivery Condition: Annealed + stress-relieved, pickled and passivated, inner surface polished for low fluid resistance
Surface Finish: Bright polished surface; pickled and passivated (anti-rust); galvanized, epoxy coating (for harsh precision equipment environments)
Pipe End: Precision beveled ends (for seamless welding with machinery components); plain ends with thread (for instrument connection); flanged ends (for hydraulic system connection)
Application: Precision machinery hydraulic pipelines, lubrication oil circuits, cooling water pipelines, instrument connecting pipes, CNC machine tool fluid pipelines, industrial robot auxiliary piping, aerospace precision equipment fluid transmission
Grade & Process Explanation
Precision-Grade Steel Performance: High-purity carbon steel grades (10#, 20#, A106 Gr.B) are selected for precision machinery piping, featuring low impurity content, uniform chemical composition, and excellent machinability. These grades have moderate strength (yield strength ≥245MPa for 20# steel) and good ductility, ensuring the pipe can withstand medium pressure in precision hydraulic/lubrication systems without deformation. Strict control of sulfur (≤0.030%) and phosphorus (≤0.035%) eliminates inclusions, avoiding fluid contamination and ensuring the smooth operation of precision machinery components.
ERW Process Advantages for Precision Piping: High-frequency ERW welding with precision forming technology produces continuous, uniform welds without filler metal, ensuring weld thickness and strength consistent with the base metal. Post-weld annealing and stress relief eliminate residual stress, preventing pipe deformation during precision machining and installation. The inner surface is polished to Ra≤1.6μm, reducing fluid resistance and avoiding oil residue, which is critical for precision hydraulic and lubrication systems. Compared with seamless pipes, ERW precision pipes offer higher dimensional accuracy, lower cost, and more stable quality for large-scale precision machinery production.
Precision Machinery Piping Design: Optimized for precision fluid transmission, with strict dimensional tolerance and roundness control to ensure seamless connection with precision machinery components (valves, pumps, instruments). The smooth inner surface prevents fluid turbulence and contamination, protecting sensitive machinery parts. Optional anti-corrosion treatments adapt to the oil, hydraulic fluid, and mild chemical environments of precision equipment, maintaining long-term stable performance and extending the service life of both the pipe and the machinery.
Dimensional Tolerance (Precision Piping Standard)
|
Item |
Tolerance |
|
Outer Diameter |
±0.3% of nominal OD (max ±0.5mm) |
|
Wall Thickness |
+8% / −5% of nominal WT (precision grade) |
|
Out‑of‑Roundness |
≤0.5% of outer diameter |
|
Straightness |
≤1.0 mm per meter |
|
Length |
+50 mm / −0 mm (precision cutting) |
Mechanical Properties (Precision Piping Requirements)
|
Property |
10# Carbon Steel |
20# / A106 Gr.B |
|
Minimum Yield Strength |
≥205 MPa |
≥245 MPa |
|
Tensile Strength |
335–475 MPa |
410–550 MPa |
|
Elongation |
≥31% |
≥25% |
|
Hardness (HB) |
≤137 |
≤156 |
|
Hydrostatic Test |
100% tested at 1.2× working pressure |
100% tested at 1.2× working pressure |
|
Inner Surface Roughness |
Ra≤1.6μm |
Ra≤1.6μm |
Note: Inner surface roughness and dimensional accuracy tests are mandatory for precision machinery piping to ensure smooth fluid transmission and avoid damaging sensitive machinery components. For high-pressure precision hydraulic systems, additional pressure fatigue tests are available.
Chemical Composition (Max. %, Precision-Grade Carbon Steel)
|
Element |
C |
Mn |
P |
S |
Si |
|
10# Carbon Steel |
≤0.12 |
≤0.60 |
≤0.035 |
≤0.035 |
≤0.35 |
|
20# / A106 Gr.B |
≤0.23 |
≤1.00 |
≤0.030 |
≤0.030 |
≤0.35 |
Residual elements: Cu ≤0.20%, Ni ≤0.30%, Cr ≤0.30%. High-purity composition control avoids impurity precipitation, preventing fluid contamination and ensuring the reliability of precision machinery fluid systems.
Manufacturing Process
Raw Material Inspection: Strict chemical & mechanical testing of high-purity carbon steel strips, impurity content verification, and surface quality inspection to meet precision piping requirements.
Precision Strip Cold Forming: High-precision forming rolls ensure uniform wall thickness, high roundness, and consistent dimensional accuracy, laying the foundation for precision piping performance.
High-Frequency ERW Welding: Continuous full-penetration welding with intelligent temperature and pressure control, ensuring weld uniformity and no internal defects.
Weld Annealing & Stress Relief: Eliminate residual stress, refine grain structure, enhance pipe ductility and machinability, avoiding deformation during installation.
Inner Surface Polishing: Precision polishing of the inner surface to Ra≤1.6μm, reducing fluid resistance and avoiding oil residue and contamination.
100% NDT Inspection: Ultrasonic testing for weld defects; visual inspection for surface quality; dimensional accuracy testing for each pipe.
Surface Treatment: Pickling and passivation for anti-rust; optional bright polishing, galvanizing, or epoxy coating to adapt to different precision machinery environments.
Finishing: Precision cutting to fixed lengths, pipe end processing (beveled/threaded/flanged), standard marking for precision identification.
Product Advantages
Ultra-High Dimensional Precision: Strict tolerance control for outer diameter, wall thickness, and roundness, ensuring seamless connection with precision machinery components.
Smooth Inner Surface: Polished inner surface (Ra≤1.6μm) reduces fluid resistance, avoids contamination, and protects sensitive machinery parts.
Stable ERW Weld Quality: Weld strength consistent with base metal, no internal defects, ensuring leak-free fluid transmission for precision systems.
High-Purity Material: Low-impurity carbon steel grades, avoiding fluid contamination and ensuring the normal operation of precision machinery.
Excellent Machinability: Good ductility and low hardness, easy to cut, thread, and weld, adapting to precision machinery installation requirements.
Cost-Effective & Efficient Production: ERW process with high precision and production efficiency, suitable for large-scale precision machinery piping supply.
Complete Quality Traceability: MTR reports, SGS/BV third-party inspection available, meeting precision machinery industry quality standards.
Main Applications
CNC machine tool hydraulic and lubrication pipelines
Precision instrumentation connecting pipes and fluid circuits
Industrial robot auxiliary piping (hydraulic, pneumatic)
Aerospace auxiliary equipment precision fluid pipelines
High-precision hydraulic and pneumatic system piping
Precision testing equipment fluid transmission pipes
Medical precision equipment auxiliary piping (non-corrosive medium)
Quality Inspection & Certification
Full dimensional inspection of OD, wall thickness, straightness, roundness, and length (100% inspection for precision grade)
Tensile, bend, hardness, and hydrostatic pressure tests to ensure mechanical performance
100% ultrasonic weld inspection, inner surface roughness testing (Ra≤1.6μm)
Heat-batch chemical composition analysis for high-purity verification
Mill Test Report (MTR), third-party precision inspection (SGS/BV) available for industry acceptance
Packaging & Delivery
Packaging: Individual packaging with anti-scratch film, bundled with soft steel strips, wrapped in waterproof cloth, plastic end caps for protection (preventing inner surface scratches and contamination)
Marking: ERW, Precision Machinery Piping, steel grade, size, inner surface roughness, heat number, batch number
Trade Terms: FOB, CIF, CFR, DAP
Shipping Ports: Tianjin, Qingdao, Shanghai, Ningbo
Customization: Custom size (OD/WT), inner surface roughness, pipe end form, and surface treatment supported to match specific precision machinery requirements
Contact Us
For quotation, stock availability, delivery schedule and customized precision solutions of ERW Carbon Steel Pipe For Precision Machinery Piping, please contact our sales team. We provide high-precision ERW carbon steel pipes and professional technical support for precision machinery fluid systems, ensuring the stable and efficient operation of your precision equipment.
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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