High-carbon seamless hot-finished black steel tube 159x40 is a massive, ultra-thick-walled hollow section engineered for supreme structural performance and extreme durability. Manufactured from high-quality carbon steel grade 45 (C45E) through the hot rolling of solid cylindrical billets, this pipe provides a monolithic, weldless structure with high uniform density. With an outer diameter of 159 mm and a reinforced 40.0 mm wall, it is designed to handle extreme mechanical stresses and high-torque operational loads.

The product is certified under EN 10216-1 for pressure pipelines and EN 10210-2 for structural sections (3.1 + CE certified), providing the highest safety standards. Due to the high carbon content in Steel 45, this profile offers significant surface hardness and mechanical toughness. It is primarily used as a premium mechanical billet in the machinery sector for machining heavy rollers, geared rings, shafts, and bushings that require extreme precision and strength. The seamless construction ensures predictable material performance during heat treatment (hardening) and eliminates any risk of weld joint failure.

The untreated black surface is suitable for industrial painting or specialized hardening processes. We offer prompt self-pickup from regional logistics centers in Europe, Poland, and Bulgaria. Wholesale terms apply for orders starting from 1 ton. Our metal centers provide professional band-saw cutting services to meet your specific length requirements. Contact our technical department for a detailed commercial quotation and technical support for this high-strength profile.