Hot-rolled Large-diameter Thick-wall Seamless Steel Pipes
Products Description
Eliminating the weak points of welded pipes, our products possess dense and uniform metallographic structure, ultra-high structural strength and outstanding impact resistance. They are the preferred base materials for core load-bearing, hydraulic transmission and structural connecting parts of excavators, cranes, loaders, hydraulic supports and other heavy-duty construction machinery, perfectly adapting to high-load, high-impact, high-low temperature and high-frequency reciprocating working scenarios.
Core Product Advantages
1. Integral Hot-rolled Forming, Stable and Safe Structure
Integrally forged by hot rolling without welding seams or splicing risks, the pipes completely avoid common defects of welded pipes such as cracking, pressure leakage and deformation. With uniform wall thickness, smooth inner and outer walls and high overall rigidity, they can withstand long-term high pressure, heavy load and alternating load, effectively eliminate equipment operation failures, and greatly improve the overall stability and safety of construction machinery.
2. Superior Mechanical Properties for Harsh Conditions
Optimized by precise heat treatment technology, the pipes deliver excellent tensile strength, yield strength and low-temperature toughness, with outstanding impact performance at -40℃, adapting to complex field environments such as extreme cold, high temperature, dust and humidity. Featuring excellent fatigue resistance, bending resistance and extrusion resistance, the pipes remain undeformed under cold bending and uncollapsed under pressure, resisting instantaneous impact and continuous heavy pressure during equipment operation, with a far longer service life than ordinary pipes.
3. High Dimensional Accuracy for Deep Processing & Assembly
Equipped with automatic hot rolling production lines and precision shaping technology, the pipes have minimal errors in outer diameter, wall thickness, roundness and straightness with strictly controlled dimensional tolerance. The smooth inner wall is suitable for honing, rolling and other deep processing. It can be directly processed into core components such as hydraulic cylinder barrels and high-pressure sleeves, featuring high assembly fitting degree and excellent sealing performance, fully meeting the precision assembly requirements of construction machinery.
4. Complete Material Grades & Customization Support
We stock mainstream engineering-grade materials including 20#, 45#, 16Mn, 27SiMn, 40Cr and 42CrMo, covering the full steel grade range of 460-960MPa. Customization of non-standard sizes with large diameter and extra thick wall is available. Secondary processing services such as cutting, quenching and tempering, surface quenching, polishing and finish machining are supported, providing one-stop customized solutions for diverse material demands of heavy-duty construction machinery.
Main Applications
Widely used in the manufacturing of core components of various construction machinery, including excavators, truck cranes, crawler cranes, loaders, concrete pump trucks, hydraulic supports, aerial work platforms and heavy hydraulic equipment. Typical applications include hydraulic cylinder barrels, high-pressure hydraulic pipelines, equipment outriggers, boom connecting pipes, load-bearing sleeves, hollow transmission shafts, large mechanical bushings and pile driving equipment structural parts.
Quality Assurance
We implement standardized whole-process quality control from raw material screening, hot rolling forming, heat treatment, precision finishing to finished product inspection. Each batch of products undergoes strict testing procedures including ultrasonic flaw detection, hydraulic pressure test, mechanical property test and dimensional accuracy verification to ensure zero defective products. It fully meets the high-standard material requirements for high-end construction machinery equipment manufacturing, supporting bulk supply, customized processing and third-party quality inspection.
