Description
ASTM A519 Honed Tube for Hydraulic Cylinder
Material
This product is a high-precision, Honed Tube For Hydraulic Cylinder conforming to ASTM A519, specifically engineered for hydraulic cylinder applications. It utilizes cold-drawn and honed finishing techniques to deliver exceptional inner surface smoothness and tight dimensional tolerances.
Specifications
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Grades: ASTM A519 (SAE/AISI) 1026, 1020, 1045, 4130, 4140.
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Outer Diameter: range typically from approximately 4 mm to 426 mm.
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Wall Thickness: between 0.5 mm to 50 mm.
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Length: up to 12 m, often in single/double random lengths per customer needs.
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Delivery Conditions: Cold-drawn and honed, with surface finish options such as black, bright, SRB (Skived and Roller Burnished).
Chemical Composition
| Grade | C (%) | Mn (%) | P (max) (%) | S (max) (%) | Si (%) | Cr (%) | Mo (%) |
|---|---|---|---|---|---|---|---|
| 1026 | 0.22–0.28 | 0.60–0.90 | ≤0.04 | ≤0.05 | — | — | — |
| 1020 | 0.18–0.23 | 0.30–0.60 | ≤0.04 | ≤0.05 | — | — | — |
| 1045 | 0.43–0.50 | 0.60–0.90 | ≤0.04 | ≤0.05 | — | — | — |
| 4130 | 0.28–0.33 | 0.40–0.60 | ≤0.04 | ≤0.04 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 |
| 4140 | 0.38–0.43 | 0.75–1.00 | ≤0.04 | ≤0.04 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (50 mm) |
|---|---|---|---|
| 1026 | ≈ 490 | ≈ 415 | 15 % |
| 1020 | ≈ 420 | ≈ 350 | 15 % |
| 1045 | ≈ 600 | ≈ 450 | 12 % |
| 4130 | ≈ 670 | ≈ 435 | ~ 25 % |
| 4140 | ≈ 860 | ≈ 660 | ~ 25 % |
Main Characteristics
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Superior internal surface finish via honed and SRB processing—ideal for hydraulic tube barrels.
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Tight dimensional tolerances in ID/OD and wall—enhancing seal integrity and smooth piston movement.
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Range of mechanical properties: from general-purpose (1020/1026), to higher strength (1045), to heat-treatable, high-performance alloy options (4130/4140).
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4130/4140 offer excellent strength, toughness, and are well-suited for heat treatment to enhance hardness and wear resistance.
Applicable Standards
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ASTM A519 / ASME SA519 governs the seamless carbon and alloy steel mechanical tubing standard.
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Includes normalized, quenched & tempered, annealed, and stress-relieved conditions as part of the spec.
Application Domains
Used notably in:
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Hydraulic cylinders—serving as seamless honed barrels in excavators, forklifts, cranes, and other hydraulic machinery.
Breakdown by grade:
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1020/1026: suitable for moderate performance needs.
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1045: for increased strength requirements.
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4130/4140: recommended for high-stress, fatigue-prone environments where durability is essential.
