Engineering Machinery

In the engineering machinery industry, tubing is widely used in hydraulic systems, fluid transfer lines, cooling circuits, instrumentation systems, structural components, and equipment operating in corrosive or demanding environments.

TORICH supplies seamless stainless steel tubes, welded stainless steel tubes, precision tubing, instrumentation tubing, hydraulic tubing, and selected alloy steel tubes for construction equipment, mining machinery, lifting equipment, and heavy-duty industrial systems.

Whether you are looking for hydraulic line tubing, cooling system tubing, corrosion-resistant piping, or high-strength structural tubing, TORICH provides a complete solution.

Size Range:

TORICH supplies tubing for construction machinery and equipment in a wide range of sizes, with outside diameters from 3 mm to 630 mm and wall thicknesses from 0.5 mm to 55 mm.

Materials:

• Stainless steel: 304 / 304L / 316L / 321 / 2205 / 2507
• Heat Resistant Stainless Steel: 309S / 310S/ 409L / 439 / 441

Standards:

• ASTM A269 / ASTM A213 / ASTM A312 / ASTM A511 / ASTM A513 / ASTM A519
• EN 10216-5 / EN 10305-1 / EN 10305-2 / EN 10305-4
• DIN 2391 / DIN 2393
• JIS G3446 / JIS G3445

Engineering Machinery Stainless Steel Tube Applications

 

Hydraulic Control & Pressure Lines

Tube Solution: Seamless stainless steel hydraulic tubes and precision formed tube assemblies

Typical Grades: 304 / 316L / 316 / 2205 / 2507 

Size Range: OD: 6–60 mm | WT: 0.5–5 mm

Standards: ASTM A269 / ASTM A213 / EN 10216-5 / DIN 2391

Achievable Quality: Precision hydraulic tubes with OD tolerance up to ±0.05 mm, H8/H9 inner diameter accuracy available, and 100% eddy current testing.

Fuel Supply & Return Lines

Tube Solution: Small diameter seamless stainless steel tubes for fuel supply and return systems.

Typical Grades: 304 / 304L / 316L

Size Range: OD: 4–25 mm | WT: 0.5–3 mm

Standards: ASTM A269 / EN 10216-5 / DIN 2391

Achievable Quality: High-cleanliness fuel tubes with controlled dimensional accuracy up to ±0.05 mm, bright annealed surface finish.

Cooling System Tubing

Tube Solution: Stainless steel tube for engine cooling and hydraulic oil cooling circuits

Typical Grades: 304L / 316L / 321

Size Range: OD: 6–25 mm | WT: 0.5–2.0 mm

Standards: ASTM A269 / ASTM A213 / EN 10216-5

Achievable Quality: Thermal cycling resistance from -40°C to 200°C, ≥500 h salt spray resistance, and stable mechanical integrity under continuous coolant flow conditions.

Lubrication & Oil Distribution Lines

Tube Solution: Precision stainless steel tubes and coiled tubing.

Typical Grades: 304 / 304L / 316L

Size Range: OD: 4–20 mm | WT: 0.5–2 mm

Standards: ASTM A269 / ASTM A632 / EN 10305-1

Achievable Quality:Precision stainless steel lubrication tubes with H8/H9 inner diameter tolerance, Ra ≤0.8 μm internal surface finish, and excellent formability for vibration-resistant and space-limited piping applications.

Instrumentation & Sensor Lines

Tube Solution: Precision stainless steel instrumentation and capillary tube for sensing and control systems

Typical Grades: 304L / 316L

Size Range: OD: 3–25 mm | WT: 0.3–2.0 mm

Standards: ASTM A269 / ASTM A632 / EN ISO 1127

Achievable Quality: OD tolerance ±0.05 mm, WT tolerance ±0.03 mm, Ra ≤ 0.2 μm internal surface, and stable pressure transmission up to 600 bar with helium leak-tight performance.

Exhaust & Aftertreatment Tubes

Tube Solution: Heat-resistant stainless steel seamless and welded tubes

Typical Grades: 304 / 321 / 409L / 439 / 441

Size Range: OD: 15–100 mm | WT: 0.8–3 mm

Standards: ASTM A269 / ASTM A632 / EN ISO 1127

Achievable Quality: High-temperature stainless steel tubes with service capability up to 900°C, wall thickness tolerance controlled within ±10%.

1. Dimensional & Geometric Customization

• We offer customization for non-standard sizes with an outer diameter (OD) of 3 mm–630 mm and a wall thickness (WT) of 0.5 mm–40 mm.
• The inner diameter tolerance for hydraulic cylinder tubes can be controlled within the H7–H9 range.
• We support the customization of special-shaped tubes, including elliptical, flat, polygonal, plum-blossom, trapezoidal, and asymmetrical cross-sections.
• Custom tube bending services are available, with a minimum bending radius of 1.5D–3D.

2. Internal Surface & Cleanliness Control

• Customizable inner surface roughness: Ra ≤ 1.6 μm (standard industrial grade); Ra ≤ 0.8 μm (hydraulic grade); Ra ≤ 0.4 μm (precision grade).
• Available processes include mechanical polishing, pickling and passivation, bright annealing, internal bore honing, and skiving and roller burnishing.
• Supports ISO 4406 cleanliness standards, as well as protective end caps or plugs for transport.

3. Material Customization

• Austenitic stainless steel: 304 / 304L / 316L / 321 (general hydraulic systems, corrosion-resistant fluid lines, welded assemblies)
• Ferritic stainless steel: 409L / 439 / 441 (exhaust systems and medium-to-high temperature applications)
• Duplex stainless steel: 2205 / 2507 (high-pressure hydraulic systems and harsh corrosive environments)
• Heat-resistant stainless steel: 310S (continuous high-temperature service)
• Nickel-based alloys: Inconel / Hastelloy (critical systems involving extreme corrosion and high temperatures)
• Chromium-molybdenum steel: 4130 / 4140 (ultra-high-pressure hydraulics and structural load-bearing applications)

4. Mechanical Strength & Pressure Rating

• Operating pressure: 100 – 1000+ bar (design dependent on specific application)
• Burst pressure: ≥ 2.5 – 4.0 × operating pressure
• Fatigue performance: 10⁵ – 10⁷ cycles (hydraulic impulse test)
• Cold-work strengthening: 10% – 60% increase in strength
• Heat treatment options: Annealing / Solution treatment / Stress relieving
• Hardness range: 80 HRB – 45 HRC (material dependent)
• Straightness control: ≤ 0.5 mm/m (precision grade)

5. Tube End & Connection Customization

• Precision cut / deburred / chamfered ends; flaring, expansion & reduction ends
• Threaded / welded / flanged interfaces (DIN, JIC, ORFS, SAE compatible)
• OEM custom interfaces, quick connectors & laser marking traceability

Our Certificate

 

 

IATF 16949:2016

ISO 9001:2015

Environmental Management System Certificate

 

Related products

 

Stainless Steel Honed Tube

Stainless Steel Cylinder Tube

1 Chromoly Tubing

FAQ

 

 

01.Do you support customized sizes?

Yes, we support fully customized dimensions for construction machinery tubing, with outer diameters from 3 to 630 mm, wall thickness from 0.5 to 40 mm, and tight tolerances within ±0.1 to ±0.5 mm depending on application requirements.

02.What applications do your stainless steel tubes serve in construction machinery?

Our stainless steel tubes are widely used in hydraulic systems, cooling circuits, fuel and lubrication lines, and exhaust systems, as well as for structural applications in excavators, loaders, cranes, and mining equipment.

03.What surface treatments are available for engineering machinery tubing?

We offer pickling, passivation, internal polishing up to Ra ≤ 0.4 μm, oil-free cleaning, and nitrogen-sealed packaging for contamination-sensitive hydraulic systems.

04.What materials are available?

We supply 304/316L/321 stainless steel, duplex (2205/2507), 409L/441, 310S, 17-4PH, and nickel alloys (Inconel/Hastelloy), etc.

05.What is the achievable precision level?

Dimensional tolerance can reach ±0.05 mm, and hydraulic ID precision up to H7–H12 depending on application.

06.Stainless steel pipes are prone to scratching and corrosion during long-distance sea transport; how do you package them?

We use export-grade protective packaging: each pipe is cleaned, fitted with end caps, wrapped for moisture protection, and securely bundled. Depending on the pipe dimensions and length, we then load them into reinforced crates or wooden cases.