Axle from a seamless tube for railroad vehicles, and a process for manufacturing an axle from a seamless steel tube for railroad vehicles

摘要

The present invention relates to an axle forged from seamless tubes, with a chemical composition suitable to guarantee high fatigue strength, improved yield strength and tensile strength, and having reduced weight for use on railroad vehicles. The present invention further relates to a process of manufacturing the axle forged from seamless steel tube with high fatigue strength, improved yield strength and tensile strength, and having reduced weight for use on railroad vehicles, which is produced from pig iron or scrap, casting, reheating furnace, perforation of billets, elongation of perforated billets, hollow finishing, forging and finish machining, which includes a supporting and centering chamfer at the inner edge of the inspection bore of the end and smooth recess in the entrance of the threaded bores.

主权项

1. A process for manufacturing an axle having varying thickness and forged from seamless steel tube for railroad vehicles, wherein the process comprises the following steps:
(1) melting a metal alloy material, generating the metallic steel alloy material, the generated metallic steel alloy material comprising 0.32 to 0.42% by weight of carbon and 1.10 to 1.70% by weight of manganese; (2) casting the molten material, forming ingoted products; (3) reheating for perforation of the ingoted products in a reheating furnace; (4) after the reheating step, perforating the ingoted products; (5) elongating the perforated products, forming hollow blooms; (6) finishing the hollows, transforming them into seamless tubes; and (7) after steps (1)-(6), forging the seamless tubes, transforming them into axles having varying thickness for railroad vehicles and properties of a minimum yield strength of 520 MPa, a minimum tensile strength of 750 MPa, and a minimum elongation of 16%.