Wire rod of high-speed railroad no-slag sleeper slab steel wire and production method thereof

A technology for high-speed railways and sleepers, which is applied in the manufacture of converters, etc., and can solve the problems of not meeting the requirements of sleeper steel wires and high strength

Inactive Publication Date: 2010-05-12
TIANJIN IRON & STEEL GRP
View PDF0 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Originally used as a wire rod for the production of sleeper wire, due to rea

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Blast furnace→top-bottom combined blown converter→LF refining furnace→150×150mm billet continuous casting→turning cooling bed→heating furnace→high wire rolling→Stelmo controlled cooling→inspection→warehousing.

[0039] (1) Furnace molten iron: Si=0.45%, P≤0.07%, S≤0.028%

[0040] (2) Converter smelting:

[0041] The smelted steel is 16MnVH, the top and bottom combined blowing converter adopts low pressure and large flow oxygen lance for oxygen supply, nitrogen / argon gas is blown at the bottom, the oxygen pressure is 0.8MPa, and the flow rate is 23000m 3 / h, remove P in the early and middle stages of slagging, and remove S in the middle and late stage of slagging; tapping [C]=0.10%, [P]=0.009%. Add 400kg of special synthetic slag into the ladle during tapping.

[0042] (3) LF refining

[0043] Composition control: [C] = 0.38%, [Si] = 1.62%, [Mn] = 0.82%, [S] = 0.008%; [B] = 0.0012% into the station oxygen a[O] = 12ppm; white residue Refining time is 18 minutes; feed ...

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 belongs to the technical field of steel and iron smelting technology, and particularly provides a high wire rod of a high-speed railroad no-slag sleeper slab steel wire and a production method thereof. The traditional single sleeper does not meet the requirements of high-speed railroad, and is upgraded into a sleeper slab. Aiming at the requirements for the wire rod of the high-speed train sleeper slab wire, the invention designs a special wire rod of a high-speed railroad no-slag sleeper slab steel wire and a manufacture method thereof. The wire rod comprises the following control components in percent by weight: 0.34-0.39% of C, 1.55-1.85% of Si, 0.75-1.00 % of Mn, 0.35-0.60 % of Cr, no more than 0.025% of P, no more than 0.025%of S, no less than 0.0008% of B and the balance of Fe. The production process of the wire rod comprises the following steps of: top-bottom blowing smelting by adopting high-quality concentrate and synthesizing of slag charge and wash during tapping; LF refining which adopts calcium carbide, carborundum and the like to form white slag; continuous casting protection pouring under the conditions that the degree of superheat is controlled in the range of 20-40 DEG C and the pulling rate is 1.9-2.8m/min; steel rolling under the conditions of controlling the tapping temperature of steel billet in the range of 950-1010 DEG C, cooling by the control of a water tank and the control of large amount wind during rolling and controlling the spinning temperature in the range of 840-860 DEG C.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting technology, and in particular provides a production and manufacturing method of a high-speed railway sleeper steel wire high wire rod. technical background [0002] Steel wires for railway sleepers are traditionally made of smooth and scored steel wires. With the development of railways, especially high-speed railways with a running speed of up to 350 kilometers, the original single sleeper is no longer suitable for high-speed railways. It has been upgraded to a 2.4m x 0.5m sleeper board, and the corresponding sleeper steel wire has also been increased from 7.0mm to More than 9.0 mm, the tensile strength is required to be more than 1420Mpa, and the elongation after breaking is L 100 ≥8%, the relaxation rate 1000h requires ≤2.5%, and puts forward higher requirements for fatigue life, and must do fatigue test and "hydrogen embrittlement" test, etc. Originally used as wire rod for s...

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): C22C38/34C21C1/02C21C5/35C21C7/06C21C7/072B22D11/115B22D11/18B22D11/22C21D8/06
Inventor 吴波孙国庆巩文旭
Owner TIANJIN IRON & STEEL GRP
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