Product Name: High-Precision Seamless Round Steel Tube (Hot Finished / Cold Drawn)

Overview

RUNYING manufactures high-precision seamless round steel tubes through hot piercing or cold drawing processes, serving as core materials for high-pressure hydraulic systems, precision transmission shafts, and critical mechanical components. Leveraging China's complete steel industry chain, we offer a full range of materials from standard carbon steel to advanced alloy steel. Our products strictly comply with international standards, including GB, ASTM, and DIN, and are exported globally for their superior strength, excellent dimensional accuracy, and reliable performance.

Core Material Specifications 

Technical Specifications

Process Type: Hot Finished Seamless (HFS), Cold Drawn Seamless (CDS), DOM Tube.

Size Range:

OD: 6mm - 457mm.

Wall Thickness: 1mm - 40mm.

Precision Grade:

Cold Drawn Tube: High precision, OD tolerance ±0.1mm, WT tolerance ±5%, excellent concentricity.

Hot Finished Tube: Commercial grade, tolerances per standards like ASME B36.10.

Surface Finish: Black, pickled, phosphated, bright, honed (Ra≤0.4μm).

Testing & Certification: Material Certificates per EN 10204 3.1 available. Support for third-party SGS/BV inspection. Hydrostatic, Eddy Current, and Ultrasonic testing are optional.

Key Advantages

1， Source Manufacturing with Dual Advantage: As a local Chinese manufacturer, we integrate the entire production chain from steelmaking to tubing, ensuring stable raw material supply and delivering exceptional quality at a competitive price.

2， Comprehensive Material Portfolio for Global Standards: We are experts in cross-referencing Chinese GB materials with international standards, offering clients the most cost-effective material solutions that seamlessly fit global engineering designs.

3， Strict Export-Oriented Quality Control: Dedicated QC lines for exports ensure every batch undergoes inspections stricter than domestic standards, guaranteeing defect-free delivery.

4， Value-Added Processing & Customization: We support cut-to-length, beveling, drilling, heat treatment (normalizing, Q&T), and special packaging (oiling, VCI paper, wooden crates) for a one-stop procurement solution.

Primary Applications

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Runying Steel Group Company occasionally has low/mild/high carbon discount steel products for sale at a low price. For details, please follow our public Facebook page (https://www.facebook.com/tangsteel) or contact our sales team.