Seamless steel pipe for impacter and manufacturing method thereof

Abstract

The invention discloses a seamless steel pipe for an impacter and a manufacturing method thereof. The seamless steel pipe comprises the following chemical components: 0.40 percent to 0.50 percent of C, less than or equal to 0.35 percent of Si, 0.50 percent to 0.80 percent of Mn, 1.00 percent to 2.00 percent of Ni, 0.20 percent to 0.40 percent of Mo, 0.80 percent to 1.10 percent of Cr, 0.10 percentto 0.20 percent of V, less than or equal to 0.015 percent of P and less than or equal to 0.005 percent of S. A continuous casting billet is controlled to enter a heating furnace at 500 to 800 DEG C and is heated to 1200 to 1280 DEG C so as to be rolled into a round pipe billet; hot cutting sizing is conducted at 700 to 950 DEG C, slow cooling is conducted to 500 DEG C or below, the round pipe billet is put into the heating furnace so as to be heated to 1240 to 1280 DEG C, perforating, rolling and sizing are conducted to reach the needed outer diameter and wall thickness, and a steel pipe is subjected to heat treatment. According to the seamless steel pipe for the impacter and the manufacturing method thereof provided by the invention, the yield strength of the steel pipe is larger than 1000 MPa, the tensile strength is larger than 1100 MPa, the percentage elongation after fracture is larger than 9 percent, the percentage reduction of area is larger than 46 percent, the U-shaped notchimpact energy is larger than 37 J, the hardness is larger than 31 HRC, and the fatigue performance reaches the impact fatigue life under 3 * 10 < 5 > times of cyclic loads.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel manufacturing, and mainly relates to a seamless steel pipe with excellent comprehensive performance for an impactor and a manufacturing method thereof. Background technique [0002] The main purpose of the rock drilling hammer is to match with the rock drilling machinery, and it is a tool for drilling and blasting holes in the rock or rock drilling and blasting construction. When working, the impactor transmits the impact power output by rock drilling machinery, withstands the high-frequency impact and torsional moment of 2600-3000 times per minute of the rock drill, and transmits more than 85-750J of impact energy in the form of impact stress waves. During the process, the inner water hole of the rock drilling hammer needs to deliver mineral water with a pressure of 0.4MPa to ensure dust removal and discharge of rock dust, and the outer surface of the hammer needs to be strongly abrasive ...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent with the publication number CN 106090451 A provides a method for manufacturing high-strength and high-wear-resistant steel pipes. However, due to the use of bimetallic clad steel plates to weld the pipes, there are many unstable factors in the quality and performance of the steel pipes. , especially the quality and performance of the composite re-welding interface of carbon steel and stainless steel is still a technical hidden danger that the industry has not overcome

Moreover, the manufacturing process of the invention is complex and costly, which is unfavorable for industrial popularization and application

Therefore, the product manufactured by this invention cannot replace the current and future rods for impactors

Images