Din black and phosphated hydraulic tube

The Din black and phosphated hydraulic tube from Shanghai Tianyang Steel Tube Co., Ltd is a cold-drawn seamless steel tube designed for high-pressure hydraulic systems. It complies with DIN 2391 standards for precision tubing, with outer diameters ranging from 10 mm to 50 mm and wall thicknesses between 1.0 mm and 4.0 mm. The surface finish is black annealed with a phosphate conversion coating, providing a matte black appearance and enhanced adhesion for downstream painting or sealing. The tube is manufactured from low-carbon steel grades such as St35.8 or St45.8, as defined in DIN 17100, ensuring consistent mechanical properties under pressure.

The phosphated surface is a standard industrial treatment for hydraulic tubing, offering moderate corrosion resistance and improved lubricity during assembly. The cold-drawn process yields tight dimensional tolerances, typically ±0.05 mm on diameter and ±10% on wall thickness, which are critical for fitting hydraulic fittings without leakage. Unlike electroplated or galvanized tubes, this finish does not flake under vibration, making it suitable for mobile machinery and heavy-duty equipment. The material is not stainless, but the phosphate layer provides sufficient protection in dry or indoor environments when paired with proper system filtration.

This tubing is commonly purchased by manufacturers of construction equipment, agricultural machinery, and industrial hydraulic presses. Buyers typically order in lengths of 5.8 meters or 6 meters, packed in bundles with anti-rust paper and steel strapping. Trade terms are commonly FOB Shanghai or CIF port of destination, with minimum order quantities usually starting at 1 metric ton. Lead times are typically 15 to 25 days after order confirmation, depending on stock availability and production scheduling.

Shanghai Tianyang Steel Tube Co., Ltd is a manufacturer based in Fengxian District, Shanghai, specializing in precision steel tubes for hydraulic and industrial applications. The company operates a cold-drawing and surface treatment facility and is listed as an imported supplier with harbor-tier trust verification, indicating verified export activity and compliance with shipping documentation. The listing confirms no direct information on years in operation, workforce size, or certifications such as ISO 9001, and no client names or project references are provided.

The supplier does not claim production capacity, revenue figures, or export volume. Their trust signals are limited to platform verification and an address in Shanghai, with no response rate or average reply time recorded. This suggests a focus on bulk export fulfillment rather than active sales engagement. Buyers should treat this as a production-based supplier with documented export history but limited public-facing operational details.