Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for producing quenched and tempered wear-resistant steel plate NM400 with thickness of 30 mm or less by using online waste heat

A wear-resistant steel plate, quenching and tempering technology, applied in the field of wear-resistant steel production, can solve the problems of energy saving and emission reduction in the iron and steel industry, poor impact deformation resistance of wear-resistant steel, high energy consumption, etc., to shorten the delivery cycle and reduce quenching. process, the effect of reducing production costs

Pending Publication Date: 2022-05-13
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires special quenching equipment, the process is cumbersome, the production cost is high, and the energy consumption is large, which is not conducive to the iron and steel industry to achieve the goal of energy saving and emission reduction.
Moreover, the wear-resistant steel produced by this method also has the problem of poor impact deformation resistance. Therefore, there is an urgent need for a production method that is more environmentally friendly and energy-saving and can maintain the excellent mechanical properties of NM400 wear-resistant steel plates

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
  • Method for producing quenched and tempered wear-resistant steel plate NM400 with thickness of 30 mm or less by using online waste heat
  • Method for producing quenched and tempered wear-resistant steel plate NM400 with thickness of 30 mm or less by using online waste heat
  • Method for producing quenched and tempered wear-resistant steel plate NM400 with thickness of 30 mm or less by using online waste heat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The chemical composition of a quenched and tempered wear-resistant steel plate NM400 with a thickness of 30mm is calculated by mass percentage: C: 0.23%, Si: 0.55%, Mn: 1.42%, P: 0.01%, S: 0.004%, Mo: 0.4%, Cr: 0.88%, Al: 0.024%, B: 0.0024%, Ti: 0.017%, and the balance is Fe and unavoidable impurities. Such as figure 1 As shown, the metallographic structure of the steel plate is tempered martensite, the grain distribution is uniform, and no mixed crystals and segregation appear.

[0026] The production method of the quenched and tempered wear-resistant steel plate NM400 with a thickness of 30 mm above is as follows:

[0027] (1) In the converter smelting process, the high-quality molten iron is desulfurized by the KR method, and medium-carbon ferromanganese is added during the converter smelting process. The control endpoint P≤0.015%, Als (acid-soluble aluminum): 0.04%; the slag-stopping cone is used , Slag stopper for double slag stop tapping, slag thickness: 40mm, a...

Embodiment 2

[0038] Such as figure 2 As shown, the chemical composition of a quenched and tempered wear-resistant steel plate NM400 with a thickness of 18mm is calculated by mass percentage: C: 0.23%, Si: 0.54%, Mn: 1.43%, P: 0.012%, S: 0.003%, Mo: 0.41%, Cr: 0.86%, Al: 0.025%, B: 0.0021%, Ti: 0.016%, and the balance is Fe and unavoidable impurities. Such as figure 2 As shown, the metallographic structure of the steel plate is tempered martensite, the grain distribution is uniform, and no mixed crystals and segregation appear.

[0039] The production method of the quenched and tempered wear-resistant steel plate NM400 with a thickness of 18 mm above is as follows:

[0040] (1) In the converter smelting process, the high-quality molten iron that enters the furnace is desulfurized by the KR method. During the converter smelting process, medium-carbon ferromanganese is added, and the control end point is P≤0.015%, Als (acid-soluble aluminum): 0.03%; slag blocking cone is used , Slag stop...

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

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
elongationaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for producing a wear-resistant steel plate NM400 which is 30 mm in thickness and is quenched and tempered by using on-line waste heat. The on-line waste heat is used for carrying out on-line quenching on a medium-thickness plate production line by using waste heat after rolling and carrying out tempering by using an off-line heat treatment furnace, the tempering temperature is 450-500 DEG C, and the tempering time is 1.8 Tmin (T is the thickness of the steel plate). According to the method, on-line waste heat quenching is used for replacing the process that the steel plate is heated to an austenite area from the room temperature in an off-line heat treatment furnace and then quenched, and the heat treatment cost for producing the quenched and tempered wear-resistant steel plate is greatly reduced. Through the design of chemical components, the martensite structure is obtained by cooling to below 400 DEG C at the cooling rate of 10-15 DEG C / s. The NM400 steel grade comprises the following chemical components in percentage by mass: 0.22 to 0.26 percent of C, 0.4 to 0.6 percent of Si, 1.3 to 1.55 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.007 percent of S, 0.3 to 0.45 percent of Mo, 0.8 to 0.95 percent of Cr, 0.01 to 0.035 percent of Al, 0.001 to 0.005 percent of B, less than or equal to 0.04 percent of Ti and the balance of Fe and inevitable impurities.

Description

technical field [0001] The invention relates to the technical field of wear-resistant steel production, in particular to a method for producing quenched and tempered wear-resistant steel plates NM400 with a thickness of less than 30 mm by using online waste heat. Background technique [0002] NM400 is a high-strength wear-resistant steel plate with fairly high mechanical strength. Its mechanical properties are 3 to 5 times that of ordinary low-alloy steel plates. production cost. It is mainly used for the processing and manufacturing of wear-resistant and vulnerable parts for mines and various construction machinery. [0003] At present, the production of NM400 steel in the industry generally adopts off-line production, that is, after the steel plate is rolled, quenching and tempering are completed in the heat treatment process. This method requires special quenching equipment, the process is cumbersome, the production cost is high, and the energy consumption is large, whi...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04B22D11/00C21C1/02C21C7/00C21C7/06C21C7/064C21D8/02
CPCC22C33/04C21C1/02C21C7/064C21C7/06C21C7/0056C21C7/0006B22D11/00C21D8/0205C21D8/0226C21D8/0263C21D2211/008
Inventor 郭营利姜军王嘉景伟德刘国良陈开锋李晓燕李金泽董建军贾为峰于鹏
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products