Seamless steel tube for manufacturing hollow core rod and production method

A technology of seamless steel pipe and hollow mandrel, applied in the direction of metal rolling, etc., can solve the problems of difficulty in manufacturing, and achieve the effects of wear resistance, fatigue resistance and corrosion resistance.

Active Publication Date: 2011-01-26
HENGYANG VALIN STEEL TUBE
View PDF6 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the large-diameter mandrels used are solid and forged, especially the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Seamless steel tube for manufacturing hollow core rod and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] A seamless steel pipe used to manufacture hollow mandrels, the grade is 30Cr3MoV, and the composition is in mass%, specifically: C: 0.32, Si: 0.55, Mn: 0.54, P: 0.010, S: 0.005, Cr: 3.24, Mo: 0.46, V: 0.24, Cu: 0.12, Ni0.07, and the rest are Fe and unavoidable impurities.

[0024] A method for producing seamless steel pipes for manufacturing hollow mandrels, which includes: tube billet blanking → ring furnace heating → Mann piercer piercing → pilger rolling mill pipe → cutting pilger head → walking furnace heating → Sizing machine sizing → heat treatment → straightening → sawing → internal and external surface treatment → manual inspection → ultrasonic eddy current automatic combined flaw detection → manual re-inspection → cleaning, marking, packaging → storage.

[0025] The specific steps are as follows:

[0026] A. Billet heating is divided into preheating, heating and soaking process. The preheating temperature depends on the furnace temperature, and the time is 5 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a seamless steel tube for manufacturing a hollow core rod and a production method. The seamless steel tube comprises the following components in percentage by mass: 0.28 to 0.33 percent of C, 0.45 to 0.65 percent of Si, 0.40 to 0.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.02 percent of S, 3.00 to 3.30 percent of Cr, 0.45 to 0.55 percent of Mo, 0.20 to 0.30 percent of V, less than or equal to 0.15 percent of Cu, less than or equal to 0.20 percent of Ni, and the balance of Fe and unavoidable impurities. The production method comprises the following steps of: blanking a tube blank, heating by using an annular furnace, punching by using a Mannesmann piercing mill, rolling the tube by using a pilger mill, cutting a pilger head, heating by using a walking beam furnace, sizing by using a sizing mill, performing heat treatment, straightening, sawing, performing internal and external surface treatment, performing manual inspection, performing ultrasonic wave and eddy current automatically combined flaw detection, performing manual reinspection, cleaning, identifying and packaging, and warehousing.

Description

technical field [0001] The invention belongs to the production field of seamless steel pipes in the metallurgical industry, and in particular relates to an alloyed high-strength, high-toughness quenched and tempered seamless steel pipe used for manufacturing a hollow mandrel and a production method thereof. Background technique [0002] The mandrel is one of the most important deformation tools of the pipe rolling mill. The mandrel and the roll work together to roll the perforated tube blank into seamless steel pipes of various sizes. The service conditions of the mandrel during the rolling process are very harsh. Its surface is subjected to compressive stress, frictional force, and alternating cold and heat stress. Therefore, the requirements for the performance of the mandrel are very high, and it needs to have high strength, high hardness, high toughness, wear resistance, fatigue resistance and corrosion resistance. At present, most of the large-diameter mandrels used ar...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22C38/24B21B23/00C21D8/10
Inventor 龙功名李阳华陈绍林冉旭张敏
Owner HENGYANG VALIN STEEL TUBE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap