Stainless Steel DOM Round Tube for Hydraulic Cylinder

Material
The product is a DOM (Drawn‑Over‑Mandrel) stainless steel round tubing, cold‑drawn over a mandrel to ensure superior dimensional precision, smooth inner and outer surfaces, and enhanced weld strength. DOM refers to the manufacturing process, not the alloy. Common stainless grades for corrosion‑resistant hydraulic applications include 304L, 316L, and 17‑4PH for higher strength needs.

Specifications

• Manufacturing Process: Electric resistance welded tubing with internal flash removed, then drawn over mandrel for tight tolerances and smooth finish.

• Possible Materials:

  • 304L: Austenitic stainless, widely used, good general corrosion resistance.

  • 316L: Low‑carbon austenitic stainless with superior resistance to chlorides and reducing acids.

  • 17‑4PH: Precipitation‑hardened martensitic stainless, high strength and hardness.

• Typical Tube Sizes for Hydraulic Use: Inside diameters from approximately 1 in to 14 in, wall thicknesses from 1/8 in to 1 in, often honed for precision.

• Finish: Precisely honed inner diameter—with Ra roughness and tolerances suited for hydraulic cylinders.

Chemical Composition
Here is a comparison of nominal compositions for five representative stainless steel grades:

Mechanical Properties
Typical properties differ by grade and temper:

Key Features

• Exceptionally smooth internal surface and tight dimensional tolerances—ideal for hydraulic cylinder efficiency and sealing.

• High mechanical strength and fatigue resistance due to the DOM manufacturing process.

• Tailored corrosion resistance:

  • 304L for general applications;

  • 316L for environments with chlorides or acids;

  • 17‑4PH for high-strength requirements;

  • Zeron 100 and 904L for aggressive, highly corrosive conditions.

Standards

• 304L / 316L stainless tubing typically adheres to ASTM A269 (welded) and A511 (seamless).

• 17‑4PH (SAE Type 630, UNS S17400) follows aerospace or specialized specifications.

• Zeron 100 (UNS S32760) conforms to multiple standards, including ASTM A240, A182 (F55), A276, among others 

• 904L is a high-alloy stainless often referenced in corrosion-resistant applications; specific standards vary.

Applications
This DOM stainless steel tubing is ideal for hydraulic cylinders where precision, wear resistance, and corrosion protection are critical. Common application domains include marine, chemical, food & beverage, aerospace, oil & gas, and industrial hydraulics.

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