Thin-Walled Seamless Stainless Steel Tube for Motor Housing
Material Overview
A thin-walled seamless stainless steel tube is a precision-manufactured hollow stainless component with a very small wall thickness relative to its diameter. The seamless process removes weld seams, ensuring uniform properties, improved reliability, and excellent performance in high-precision applications such as electric motor housings.
Specifications
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Outer Diameter (OD): approx. 1.0 mm up to 100 mm (varies by supplier)
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Wall Thickness (WT): ultra-thin options from about 0.05 mm up to about 0.8 mm; regular thin-wall tubes may extend to several millimeters
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Surface Finish: bright annealed, polished, or smooth cold-drawn finish
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Manufacturing Process: cold-drawn or cold-rolled seamless tubing
Main Features
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Lightweight yet strong: Thin wall design reduces mass while maintaining structural integrity.
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Corrosion & temperature resistance: Stainless alloys provide excellent resistance to oxidation, corrosion, and thermal exposure.
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High dimensional precision: Seamless tubes offer tight tolerances, smooth internal/external surfaces, and excellent roundness.
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Reliable structural performance: No weld seam eliminates seam-related weaknesses, improving fatigue and mechanical reliability.
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Flexible customization: OD, WT, length, and finish can be tailored to suit different motor designs.
Our Advantages
1. Weight Reduction
Customers often need lighter housings to improve motor efficiency and reduce inertia.
Advantage: We supply ultra-thin seamless tubes with extremely low wall thickness while preserving mechanical strength.
2. Reliability Under Vibration and Load
Motors experience continuous vibration and cyclic loads.
Advantage: Seamless construction provides superior uniformity and fatigue performance with no weld seam failures.
3. Corrosion and Environmental Durability
Motor housings in humid or chemically exposed environments require corrosion-resistant materials.
Advantage: We offer 304, 316L, duplex, and super-duplex grades with excellent corrosion resistance.
4. Precision for Tight Fits
Motor assemblies require accurate dimensions, smooth surfaces, and low friction.
Advantage: Cold-drawn production ensures high dimensional accuracy and excellent inner/outer surface quality.
5. Customization Flexibility
Different motors require different sizes and finishes.
Advantage: Wide range of OD/WT options and customizable finishes support diverse engineering needs.
Chemical Composition
| Grade |
C (max) |
Cr |
Ni |
Mo |
Notes |
| 304 |
0.08% |
~18% |
~8% |
— |
Standard “18-8” stainless; widely used. |
| 304L |
0.03% |
~18% |
~8% |
— |
Low-carbon version; better corrosion resistance after forming. |
| 316 |
0.08% |
~17–18% |
~10–12% |
~2–3% |
Higher resistance to chlorides and harsh environments. |
| 316L |
0.03% |
~16–18% |
~10–12% |
~2–3% |
Preferred for corrosion resistance and weldability. |
| Duplex 2205 |
low |
~22% |
~5% |
~3% |
High strength and stress-corrosion resistance. |
Mechanical Properties
| Grade |
Tensile Strength (UTS) |
Yield Strength (YS) |
Notes |
| 304 (cold-worked) |
~500–650 MPa |
~200–300 MPa |
Good balance of strength and ductility. |
| 304L |
~480–550 MPa |
~170–220 MPa |
Lower carbon for corrosion resistance. |
| 316 (cold-worked) |
~500–650 MPa |
~200–300 MPa |
Strong and corrosion-resistant. |
| Duplex 2205 |
~700–900 MPa |
~450–600 MPa |
High strength for demanding conditions. |
| Super-Duplex 2507 |
~800–1000 MPa |
~500–650 MPa |
For very harsh environments requiring premium durability. |
Applicable Standards
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ASTM A312 – Seamless and welded austenitic stainless steel pipes
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ASTM A269 – Seamless and welded austenitic stainless steel tubing for general service
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EN 10216-5 – Stainless steel seamless tubes for pressure purposes
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JIS G3459 – Stainless steel pipes for corrosion-resistant service
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GB/T 14976 – Stainless steel seamless tubes for fluid transport
Application Fields
General Applications
Used in aerospace components, chemical processing, precision mechanics, medical equipment, instrumentation tubing, and structural lightweight systems.
Uses in Motor Housing
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Motor outer casing: Lightweight and strong shell for electric motors.
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Bearing support sleeves: High-precision inner surface ensures smooth bearing placement.
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Cooling jackets: Corrosion-resistant thin-wall tubes suitable for fluid-cooled electric motors.
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Structural reinforcements: Ideal for compact actuators and high-reliability assemblies requiring low mass and high rigidity.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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