SAE1045/St52/4140 Honed Seamless Steel Tube for Hydraulic Cylinders

SAE1045/St52/4140 Honed Seamless Steel Tube is a precision-engineered product specifically manufactured for hydraulic cylinder barrel applications. Unlike standard ASTM A106 Gr B Seamless Carbon Steel Pipe designed for high-temperature fluid transmission, this honed tube features a mirror-finished internal surface achieved through precision honing process.

Product Parameters

Inner diameter range: 30mm to 500mm . Regular sizes include 40mm, 50mm, 60mm, 80mm, 100mm, 120mm, 140mm, 160mm, 180mm, 200mm, 220mm, 250mm, 280mm, 300mm, 350mm, 400mm, 450mm, and 500mm . Wall thickness: 5mm to 40mm . Common thicknesses: 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 25mm, 30mm, 35mm, and 40mm . Length: 3 meters to 12 meters standard, with custom lengths up to 16 meters available . Processing technique: Cold drawn seamless followed by honing or skiving and roller burnishing . Execution standards: DIN 2391, EN 10305, ASTM A519, and GB/T 8713 . Packaging: Seaworthy bundles with anti-rust oil coating, plastic caps on both ends, waterproof wrapping, and steel strip reinforcement . Surface treatment: Honed internal surface with Ra 0.2-0.4 micron roughness, external surface can be bare, oiled, or as requested .

Chemical Composition (Typical %)

SAE1045: Carbon 0.42-0.50, Manganese 0.60-0.90, Phosphorus ≤0.035, Sulfur ≤0.035, Silicon 0.15-0.35 . St52: Carbon ≤0.22, Manganese ≤1.60, Phosphorus ≤0.025, Sulfur ≤0.025, Silicon ≤0.55 . 4140: Carbon 0.38-0.45, Manganese 0.75-1.00, Phosphorus ≤0.025, Sulfur ≤0.025, Silicon 0.15-0.35, Chromium 0.80-1.10, Molybdenum 0.15-0.25 .

Physical Properties

SAE1045: Tensile Strength 600-800 MPa, Yield Strength ≥375 MPa, Elongation ≥15 percent . St52: Tensile Strength 580-780 MPa, Yield Strength ≥470 MPa, Elongation ≥15 percent . 4140: Tensile Strength 700-900 MPa, Yield Strength ≥520 MPa, Elongation ≥12 percent . Internal diameter tolerance: H8 to H9 precision . Surface roughness: Ra 0.2-0.4 micron . Straightness: ≤1mm per 1000mm .

Product Applications

Hydraulic cylinder barrels for construction machinery, excavators, and cranes . Pneumatic cylinders for industrial automation equipment . Telescopic cylinders for dump trucks and lifting platforms . This precision honed tube provides the smooth internal surface required for reliable piston seal performance, while the ASTM A106 Gr B Seamless Carbon Steel Pipe mentioned earlier continues to serve different applications in high-temperature pressure systems.