Wear-Resistant Steel Composition for Balanced Strength and Processability
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Solution Overview
Problem
Existing wear-resistant steel products with ultra-high strength and hardness are difficult to process mechanically, posing challenges in manufacturing and application due to their harsh working conditions.
Innovation Solution
A high-strength, high-hardness reinforced wear-resistant steel with a balanced chemical composition of C, Si, Mn, Cr, and additional elements like Mo, Ni, and RE, which allows for improved processability and mechanical properties through plasticity-induced phase transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon content and alloying elements are increased to improve strength and hardness, then mechanical performance is improved, but processability deteriorates
Solution Approach 1:
The patent optimizes the chemical composition parameters by precisely controlling carbon content (0.22-0.33%) and alloying element ranges, achieving a balance between strength/hardness and processability. This parameter optimization allows the steel to have sufficient mechanical performance while remaining processable with conventional equipment.
Solution Approach 2:
The patent creates a composite microstructure consisting of martensite, bainite, and residual austenite phases through controlled composition and heat treatment. This multi-phase composite structure provides both high strength/hardness and improved processability compared to single-phase ultra-high strength steels.
2Reliability
If ultra-high strength and hardness are achieved, then wear resistance is improved, but mechanical processing becomes very difficult
Solution Approach 1:
The patent adjusts the hardness parameter to an optimized range (400-500 HBW) rather than pursuing extreme ultra-high hardness values. This parameter change maintains excellent wear resistance while enabling conventional mechanical processing operations such as cutting, drilling, and bending.
Solution Approach 2:
The patent achieves local quality enhancement by creating a multi-phase microstructure where hard martensite and bainite provide wear resistance, while residual austenite and optimized composition maintain overall processability. The distribution of phases at different scales provides both local hardness and global processability.
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 steel exhibits enhanced mechanical properties and wear resistance, making it more convenient to process and apply in harsh conditions while maintaining excellent toughness and thermal stability.
Implementation Method 1
In actual use, the high-strength, high-hardness reinforced wear-resistant steel is prone to plasticity-induced phase transformation, which can significantly improve the strength and hardness of the steel plate, thereby improving the wear resistance of the steel plate.
Data Source
AI summary
Disclosed in the present invention is high-strength and high-hardness reinforced wear-resistant steel, comprising Fe and inevitable impurities, and further comprising the following chemical elements in percentage by mass: C: 0.22-0.33%; Si: 0.10-1.00%; Mn: 0.50-1.80%; Cr: 0.80-2.30%; Al: 0.010-0.10%; RE: 0.01-0.10%; W: 0.01-1.0%; and at least one of MO: 0.01-0.80%, Ni: 0.01-1.00%, Nb: 0.005-0.080%, V: 0.01-0.20%, and Ti: 0.001-0.50%. In addition, further disclosed in the preset invention is a manufacturing method for the high-strength and high-hardness reinforced wear-resistant steel, comprising the steps of: (1) smelting and casting; (2) heating; (3) rolling; and (4) on-line quenching: wherein the cooling start temperature of primary cooling is (Ar3′+5)-(Ar3′+50)° C., M90<final cooling temperature<Bs, and the cooling speed is 2-15° C./s; and then performing air-cooling to room temperature.