When engineers and procurement managers search for a reliable
hydraulic steel tube supplier, three things matter most: precision, surface quality, and certified performance. At
PipeCW China (Zhangjiagang Chewit International Co., Ltd.), we manufacture
cold drawn seamless steel tubes for hydraulic systems that meet the world's toughest standards — DIN 2391, EN 10305, ASTM, and GB.
Whether your application requires
black phosphated,
Cr6-free galvanized, or
bright annealed surface treatment, PipeCW delivers tubes built for high-pressure environments, long service life, and global export.
This guide covers everything you need to know — product types, specifications, surface treatments, industry applications, and why global buyers trust PipeCW for their
hydraulic steel tube requirements.
What Is Hydraulic Steel Tube? Definition, Types & Key Uses
Hydraulic steel tube is a precision-engineered pipe used to carry hydraulic fluid under high pressure within a mechanical system. Unlike standard pipes,
hydraulic tubes are manufactured with tight dimensional tolerances, smooth inner surfaces, and high-strength materials — making them critical components in fluid power systems.
Key Characteristics of Hydraulic Steel Tubes
• High pressure resistance — typically rated up to 500 bar
• Tight tolerances — outer diameter precision within ±0.05mm
• Smooth inner bore — Ra surface roughness as low as 0.2μm
• Seamless construction — no welds, reducing risk of failure under load
• Multiple surface options — phosphated, galvanized, or bright annealed
Main Types of Hydraulic Steel Tube
| Type |
Construction |
Best For |
| Seamless Steel Tube |
No weld seam |
High-pressure hydraulic lines |
| Cold Drawn Welded Tube |
Welded & cold drawn |
Medium-pressure applications |
| Stainless Steel Hydraulic Tube |
Corrosion-resistant alloy |
Marine, chemical, food industries |
| Alloy Steel Tube |
Carbon + alloying elements |
Heavy-duty machinery & cylinders |
Common uses include
hydraulic cylinders, fluid power lines,
cold drawn steel tube assemblies, automotive components, and
seamless steel pipe networks in construction and mining equipment.
Seamless vs Welded Hydraulic Steel Tube: Which One Do You Need?
Choosing between a
seamless steel tube and a welded tube is one of the most important decisions in hydraulic system design. Each has specific advantages depending on pressure requirements, budget, and application.
| Factor |
Seamless Hydraulic Tube |
Welded Hydraulic Tube |
| Pressure Rating |
Up to 500 bar |
Up to 300 bar |
| Surface Finish |
Smooth, uniform |
Good, post-drawn |
| Wall Uniformity |
Excellent |
Good |
| Cost |
Higher |
More economical |
| Best Application |
Cylinders, high-pressure lines |
Medium-pressure systems |
| Standard |
DIN 2391, EN 10305-1 |
EN 10305-2, EN 10305-3 |
Recommendation: Use
seamless hydraulic steel tube for applications above 250 bar, heavy-duty cylinders, or any system where wall integrity is critical. Choose
cold drawn welded tube for medium-pressure systems where cost efficiency is a priority.
Our Hydraulic Steel Tube Range: Carbon, Alloy & Stainless Options
PipeCW offers a complete range of
hydraulic steel tubes across three core material categories. Each is manufactured using advanced cold drawing technology at our facility in Zhangjiagang, Jiangsu Province, China.
1. Carbon Steel Hydraulic Tube
• Grades: E235 (St35), E355 (St52), SAE 1020
• Standard: DIN 2391, EN 10305-1
• Use: General hydraulic systems, automotive, agricultural equipment
• Surface: Bright annealed, phosphated, or galvanized
2. Alloy Steel Hydraulic Tube
• Grades: ST52, 4130, 4140 chromoly alloy
• Strength: Higher yield strength — ideal for extreme-pressure applications
• Use: Mining equipment, offshore drilling, heavy industrial machinery
• Feature: Pairs well with open die forging parts and forging small parts assemblies
3. Stainless Steel Hydraulic Tube
• Grades: 304, 316, 316L (1.4401 SUS316)
• Standard: ASTM A269, DIN 17455, EN 10217-7
• Use: Chemical plants, marine equipment, food processing
• Feature: Excellent corrosion resistance — outperforms standard stainless steel pipe in harsh environments
Black Phosphated Hydraulic Steel Tube – Corrosion Resistance for Harsh Environments
Black phosphating is a chemical surface treatment applied to
hydraulic steel tubes to enhance corrosion resistance, reduce friction, and improve paint adhesion. This treatment is widely preferred in automotive and heavy machinery applications.
Benefits of Black Phosphated Hydraulic Tube
• Excellent corrosion resistance in oily and humid environments
• Improves lubricity — reduces wear during assembly and operation
• Enhances adhesion for paints and coatings
• Maintains dimensional accuracy after surface treatment
• Compliant with automotive OEM specifications
At PipeCW, our black phosphating process follows strict quality protocols to ensure uniform coating thickness. This makes our
phosphated hydraulic steel tube a top choice for
hydraulic cylinder assemblies,
seamless steel pipe systems, and automotive hydraulic lines.
Galvanized Hydraulic Steel Tube – Cr6-Free Zinc Coating for Long-Term Protection
Our
galvanized hydraulic steel tube uses a Cr6-free zinc coating process — fully compliant with REACH and RoHS environmental regulations. This makes our
galvanized steel pipe safe for global export, especially to European and North American markets.
Why Choose Galvanized Hydraulic Steel Tube?
• Zinc coating up to 80μm for superior corrosion protection
• Service life of 20–50 years in industrial environments
• Cr6-free process — environmentally safe and regulation compliant
• Compatible with standard hydraulic fittings and connectors
• Available in pre-galvanized and hot-dip galvanized variants
Our
galvanized steel pipe range is ideal for outdoor hydraulic systems, agricultural machinery, and construction equipment that operates in moisture-heavy or chemically active environments.
Bright Annealed Hydraulic Steel Tube – Superior Surface Finish & Dimensional Accuracy
Bright annealing is a heat treatment process performed in a controlled, oxygen-free atmosphere. The result is a
hydraulic steel tube with a mirror-like internal and external surface — achieving Ra roughness values as low as 0.2μm.
Advantages of Bright Annealed Tubes
• Ra surface roughness as low as 0.2μm — ideal for honing and precision machining
• Improved mechanical properties — better ductility and fatigue resistance
• Clean surface — ready for immediate use without further processing
• Compatible with stainless steel tube and alloy steel tube grades
• Preferred for medical devices, instrumentation, and precision hydraulics
Hydraulic Steel Tube Specifications: OD 6mm–76mm, Wall Thickness 0.5mm–6mm
PipeCW manufactures
hydraulic steel tubes across a wide dimensional range to support both standard and custom applications. All products are manufactured to tight tolerances using precision cold drawing equipment.
| Specification |
Details |
| Outer Diameter (OD) |
6mm – 76mm |
| Wall Thickness |
0.5mm – 6mm |
| Length |
Up to 12 meters (custom cut available) |
| Dimensional Tolerance |
±0.05mm on OD (precision grade) |
| Surface Roughness (Ra) |
As low as 0.2μm (bright annealed) |
| Pressure Rating |
Up to 500 bar |
| Material Grades |
E235, E355, ST52, SAE1020, 304, 316, 316L |
| Surface Treatment |
Black phosphated, Cr6-free galvanized, bright annealed |
| Standards |
DIN 2391, EN 10305-1/2/3, ASTM A269, GB |
Custom sizes and specifications are available on request. Contact our team at sale@chewit.cn for a detailed quote.
International Standards We Follow: DIN 2391, EN 10305, ASTM & GB
Quality certification is not optional — it is the foundation of every
hydraulic steel tube we produce. PipeCW strictly follows international manufacturing and testing standards to ensure consistent, verifiable quality for global buyers.
• DIN 2391: German standard for seamless precision steel tubes — covers dimensions, tolerances, and mechanical properties
• EN 10305-1: European standard for seamless cold drawn tubes for hydraulic and pneumatic power systems
• EN 10305-2/3: Standards covering welded cold drawn tubes for hydraulic applications
• ASTM A269: American standard for seamless and welded austenitic stainless steel tubing
• GB Standards: Chinese national standards applicable to domestic and export markets
Every shipment from PipeCW is accompanied by a
material test report (MTR) and quality certificate. Our in-house inspection team uses full sets of measurement equipment to verify dimensions, surface quality, and mechanical performance before delivery.
Pressure Rating & Mechanical Properties of Our Hydraulic Steel Tubes
Understanding the mechanical properties of your
hydraulic steel tube is critical for system safety and reliability. Below are the key mechanical values for our most popular grades.
| Grade |
Yield Strength (MPa) |
Tensile Strength (MPa) |
Max Pressure (bar) |
Elongation (%) |
| E235 (St35) |
≥235 |
340–480 |
Up to 250 |
≥25 |
| E355 (St52) |
≥355 |
490–630 |
Up to 400 |
≥22 |
| ST52 Alloy |
≥355 |
500–650 |
Up to 500 |
≥20 |
| 316L Stainless |
≥170 |
485 min |
Up to 350 |
≥40 |
All tubes undergo hydraulic pressure testing, dimensional inspection, and surface quality checks before shipment. Third-party inspection (SGS, BV, TUV) is available on request.
Industries We Serve: Construction, Automotive, Agriculture & Heavy Machinery
PipeCW
hydraulic steel tubes power critical systems across a wide range of global industries. Our
seamless steel tube,
cold drawn steel tube, and
alloy steel tube products are trusted by engineers and procurement teams worldwide.
• Construction & Civil Engineering: Excavators, cranes, concrete pumps, and hydraulic jacks
• Automotive Manufacturing: Shock absorbers, steering systems, brake lines, and engine components
• Agricultural Equipment: Tractors, harvesters, spraying machines, and irrigation systems
• Oil & Gas: Offshore drilling, pipeline control systems, and subsea hydraulics
• Mining: Drilling rigs, hydraulic loaders, and rock-breaking equipment
• Marine & Shipbuilding: Deck machinery, steering gear, and hydraulic cranes
• Industrial Machinery: Presses, injection molding machines, and robotics
Hydraulic Steel Tube for Excavators, Loaders, Cylinders & Fluid Power Systems
Heavy equipment demands
hydraulic steel tubes that perform reliably under constant pressure, vibration, and temperature changes. PipeCW specializes in tubes for these demanding applications.
Hydraulic Cylinder Tube (SKTM13C Grade)
Our
hydraulic cylinder tube is manufactured using SKTM13C steel — a high-carbon chromium steel optimized for honing and cylinder bore applications. Key features include:
• Excellent inner surface hardness — ideal for piston movement
• Honed bore surface — Ra 0.2–0.4μm for smooth piston operation
• High-pressure tolerance — engineered for heavy-duty excavators and loaders
• Compatible with hydraulic seals and standard cylinder components
These tubes integrate directly into excavator arms, loader booms, and agricultural cylinder assemblies — reducing maintenance cycles and extending system life. They complement our range of
forging small parts,
open die forging parts, and
closed die forging parts for complete fluid power system solutions.
Why Buy Hydraulic Steel Tube from PipeCW China? 10+ Years of Manufacturing Excellence
Sourcing
hydraulic steel tubes from China offers significant cost advantages — but only when you partner with a manufacturer that delivers consistent quality, on-time shipment, and transparent certification. PipeCW has been doing exactly that for over a decade.
What Makes PipeCW Different?
• Advanced Cold Drawing Technology: Our production line uses precision cold drawing to achieve dimensional accuracy within microns.
• Full In-House Quality Inspection: We test every batch — dimensional checks, pressure testing, surface roughness measurement, and mechanical property verification.
• Certified Standards Compliance: All products comply with DIN 2391, EN 10305, ASTM, and GB standards with full MTRs.
• Wide Product Range: From seamless steel tube and stainless steel pipe to
aluminum tube, CNG tube, telescopic pipe, and aluminum telescopic pole — we are a one-stop supplier.
• Custom Manufacturing: We accept custom OD, wall thickness, length, grade, and surface treatment requirements with low MOQ.
• Global Export Experience: We ship to Europe, North America, Southeast Asia, and the Middle East. Our English-speaking team ensures smooth communication and documentation.
• Eco-Friendly Processes: Our Cr6-free galvanizing and responsible manufacturing comply with REACH, RoHS, and global environmental standards.
Company: Zhangjiagang Chewit International Co., Ltd.
Location: Shuangshan Road, Jingang Town, Zhangjiagang City, Jiangsu Province, China
Email: sale@chewit.cn
Phone: +86-512-58335585
Custom Hydraulic Steel Tube Orders – Any Size, Any Surface, Low MOQ
Not all hydraulic applications are the same — and neither are our customers' needs. PipeCW accepts fully custom
hydraulic steel tube orders with flexible specifications and competitive pricing.
What You Can Customize
• Outer Diameter (OD): 6mm to 76mm (non-standard sizes available)
• Wall Thickness: 0.5mm to 6mm — specify exact tolerance class
• Material Grade: E235, E355, ST52, SAE1020, 316L, 304, or alloy grades
• Surface Treatment: Black phosphated, Cr6-free galvanized, bright annealed, or bare
• Length: Standard 6m or 12m, or cut-to-length on request
• End Treatment: Plain cut, beveled, or threaded ends
• Certification: With or without third-party inspection (SGS, BV, TUV)
We support OEM and ODM projects from concept to delivery. Whether you need
cold drawn steel tube for a hydraulic cylinder prototype or a full production run of
seamless steel pipe for export — PipeCW delivers with speed and reliability.
Frequently Asked Questions About Hydraulic Steel Tube (FAQ)
Q1: What is the difference between hydraulic steel tube and hydraulic hose?
Hydraulic steel tube is a rigid metal pipe with tight dimensional tolerances — used in fixed, high-pressure systems.
Hydraulic hose is flexible and used where movement is required. Steel tubes offer better pressure ratings, longer life, and lower long-term cost in stable installations.
Q2: What surface treatment is best for hydraulic steel tubes?
It depends on the environment. Use
black phosphating for oily or indoor environments. Choose
Cr6-free galvanizing for outdoor or humid conditions. Select
bright annealing when you need maximum precision and cleanliness.
Q3: What standards does PipeCW hydraulic steel tube comply with?
Our tubes comply with
DIN 2391,
EN 10305-1/2/3,
ASTM A269, and Chinese
GB standards. Full material test reports (MTRs) and certificates of conformance are provided with every shipment.
Q4: What is the minimum order quantity (MOQ)?
PipeCW offers
low MOQ options for most standard products. Custom sizes and special grades may have higher minimum quantities. Contact us at sale@chewit.cn to discuss your specific requirements.
Q5: Can PipeCW supply both seamless and welded hydraulic tubes?
Yes. We supply
seamless steel tube (for high-pressure applications) and
cold drawn welded tube (for medium-pressure systems). Both options are available in carbon, alloy, and stainless steel grades.
Q6: Does PipeCW supply other related products?
Yes. In addition to
hydraulic steel tube, PipeCW supplies:
stainless steel pipe,
galvanized steel pipe,
aluminum alloy pipe,
aluminum tube,
anodized aluminum tube,
telescopic pipe,
aluminum telescopic pole,
aluminum tent pole,
CNG tube, and precision
forging small parts — all from one manufacturer.
Q7: How do I get a quote for hydraulic steel tubes?
Send your specifications (OD, wall thickness, material grade, surface treatment, quantity, and destination) to
sale@chewit.cn or call
+86-512-58335585. Our team responds within 24 hours with a competitive quotation.
Conclusion
Hydraulic steel tube is the backbone of modern fluid power systems — and choosing the right manufacturer determines system reliability, safety, and long-term cost. PipeCW delivers precision
seamless steel tube,
cold drawn steel tube, and
stainless steel tube solutions that meet global standards, ship on time, and come with full certification.
Whether you need
black phosphated hydraulic tubes for automotive lines,
galvanized steel pipe for outdoor hydraulics, or
bright annealed stainless steel tube for precision instrumentation — PipeCW has the product, the capacity, and the experience to deliver.
Contact PipeCW today at
sale@chewit.cn or visit
www.pipecw.com to request a free quote and product samples.
+86 18962244644
SHUANGSHAN ROAD, JINGANG TOWN, ZHANGJIAGANG CITY, JIANGSU PROVINCE, CHINA
sale@chewit.cn
