Hot-rolled round steel for tube penetrating and production method thereof

Abstract

The invention discloses a hot-rolled round steel for pipe threading. The chemical components are: C 0.10-0.17%, Si 0.10-0.50%, Mn 0.50-0.80%, P≤0.020%, S≤0.020%, Al 0.015~0.060%, Cr 0.30~0.50%, Mo≤0.05%, Ni≤0.20%, Cu≤0.20%, Pb≤0.020%, Sn≤0.015%, Ca≤0.006%, others are Fe and inevitable impurities. The invention also discloses a production method of hot-rolled round steel for pipe threading. On the premise of the existing process route, the invention adopts a specific smelting process and narrow composition control to produce finished round steel that meets the customer's subsequent steel rolling heat treatment requirements, and realizes stable production.

Description

technical field [0001] The invention relates to a ferrous metallurgical technology, in particular to a hot-rolled round steel for piercing pipes and a production method thereof. Background technique [0002] In 2016, my country's steel exports totaled 200 countries and regions, and neighboring countries and regions are still the main export destinations of my country's steel products, accounting for more than 60% of the total steel exports. At present, the Asian region is still the main region for my country's steel exports, with an export volume of more than 30 million tons per year, accounting for more than 50% of the total steel exports. [0003] Medium-carbon low-alloy steel is mainly used for hot-rolled piercing pipes. During subsequent rolling heat treatment, continuous casting slab cracks are prone to occur, which limits the application range of medium-carbon low-alloy steel. Contents of the invention [0004] The technical problem solved by the present invention i...

AI Technical Summary

Problems solved by technology

[0003] Medium-carbon low-alloy steel is mainly used for hot-rolled piercing pipes. During subsequent rolling heat treatment, continuous casting billet cracks are prone to occur, which limits the application range of medium-carbon low-alloy steel.