Multi-Element Alloyed Steel Plate Wear Resistance
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Solution Overview
Problem
Current wear-resistant steels used in coal mining equipment, such as medium and low alloy martensite-bainite steels and high manganese steels, exhibit poor wear resistance and fatigue resistance under complex working conditions, including impact and abrasive wear, which affects their service life and performance in applications like ore crusher lining plates and scraper conveyor troughs.
Innovation Solution
A multi-component alloying steel with a chemical composition of C: 1.0-1.2%, Si: 0.6-1.0%, Mn: 8.0-10.0%, P <0.02%, S <0.02%, Cr: 1.5-2.5%, Mo: 0.2-0.5%, V: 0.6-1.0%, Nb: 0.02-0.06%, Ti: 0.01-0.1%, Al: 0.03-0.08%, and the rest Fe and unavoidable impurities, featuring a single austenitic structure, is developed. This steel undergoes steelmaking, continuous casting, heating, hot rolling, and heat treatment processes to achieve high strength and wear resistance, with specific temperature ranges and treatment conditions to refine crystal grains and form alloy carbides for enhanced strength and hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If medium and low alloy martensite-bainite steel is used, then the steel has relatively good impact toughness, but the wear resistance is obviously attenuated from the surface to the heart and fatigue stress cracking is easy to occur
Solution Approach 1:
The patent changes the chemical composition parameters by adding multi-element alloys (Cr, Mn, Mo, V, Ti, Nb, B) to transform the microstructure from martensite-bainite to predominantly martensite with refined grain structure, achieving both high impact toughness and wear resistance
Solution Approach 2:
The patent creates a composite microstructure by combining martensite phases with precipitated alloy carbides (Cr7C3, Mn3C, Mo2C, VC, TiC, NbC) distributed throughout the matrix, providing both toughness from the martensite and wear resistance from the hard carbide particles
2Reliability
If high manganese steel is used, then the steel shows special strengthening and wear resistant mechanisms under impact load, but the hardening coefficient is low and the degree of deformation hardening does not reach the ideal value
Solution Approach 1:
The patent combines high manganese content (10-14%) with other alloying elements to create a composite microstructure where martensite provides the base strength and precipitated carbides provide additional hardening, achieving higher deformation hardening capability than traditional high manganese steel
Solution Approach 2:
The patent creates local quality differences by distributing hard carbide particles throughout the martensite matrix, where the carbide-rich regions provide wear resistance and the martensite-rich regions provide toughness and deformation capacity
3Strength
If multi-component alloying with high carbon content is implemented, then the tensile strength and hardness are improved, but the impact toughness may be reduced
Solution Approach 1:
The patent optimizes the carbon content parameter (1.0-1.4%) and combines it with specific ratios of alloying elements to achieve a balance where the martensite matrix provides strength while the refined grain structure and precipitate distribution maintain toughness
Solution Approach 2:
The patent creates local quality variations through non-uniform distribution of alloy carbides, with harder carbide-rich regions providing wear resistance and tougher martensite-rich regions providing impact resistance, achieving both high strength and toughness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting hot-rolled steel plate exhibits tensile strengths over 900 MPa, yield strengths over 480 MPa, impact energies of >100 J at 25°C and 40-50 J at -40°C, and a Brinell hardness of 220-240 HB, with a wear rate less than 20×10^-6 mm^3/N·m under 200 N load sliding wear, significantly improving wear resistance and fatigue properties compared to existing steels.
Implementation Method 1
featuring a single austenitic structure
Implementation Method 2
refine crystal grains
Implementation Method 3
form alloy carbides for enhanced strength and hardness
Data Source
Figure 1~2
AI summary
This invention provides a manufacturing method of a multi-component alloying steel with high strength and high wear-resistance and a hot rolled plate thereof. The weight percentages of the chemical composition of the wear-resistant steel above is as follows: C: 1.0-1.2%, Si: 0.6-1.0%, Mn: 8.0-10.0%, P <0.02%, S <0.02%, Cr: 1.5-2.5%, Mo: 0.2-0.5%, V: 0.6-1.0%, Nb: 0.02-0.06%, Ti: 0.01-0.1%, Al: 0.03-0.08%, and the rest are Fe and unavoidable impurities. The manufacturing process of the hot rolled plate of the wear-resistant steel includes the steel making, continuous casting, heating, hot rolling and heat treatment.