2000 MPa Bulletproof Steel Plate Composition and Heat Treatment
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Solution Overview
Problem
Existing bulletproof steel plates do not achieve high enough tensile strength and Brinell hardness, and they lack sufficient atmospheric corrosion resistance and thickness for effective bulletproofing and puncture resistance.
Innovation Solution
A bulletproof steel plate with specific chemical elements (0.35-0.45% C, 0.80-1.60% Si, 0.3-1.0% Mn, 0.02-0.06% Al, 0.3-1.2% Ni, 0.30-1.00% Cr, 0.20-0.80% Mo, 0.20-0.60% Cu, 0.01-0.05% Ti, 0.001-0.003% B, and balanced Fe and impurities) is manufactured through smelting, heating, rolling, quenching, and low-temperature tempering processes to achieve 2000 MPa tensile strength and 600 Brinell Hardness, with air cooling and controlled temperature processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bulletproof steel plates are used, then basic bulletproof function is provided, but tensile strength and Brinell hardness are insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition parameters (C: 0.35-0.45%, Si: 0.80-1.60%, Mn: 0.30-1.00%, etc.) and processing parameters (heating temperature 1130-1250°C, rolling temperature 950-1050°C, quenching temperature 880-930°C, tempering temperature 180-220°C) to achieve tensile strength ≥2000 MPa and Brinell hardness ≥600, resolving the contradiction between strength and reliability
Solution Approach 2:
The patent creates a composite material system by combining multiple alloying elements (C, Si, Mn, Ni, Cr, Mo, Cu, Ti, B) in specific proportions to form a tempered martensite microstructure, achieving superior mechanical properties that meet both high strength and bulletproof reliability requirements
2Reliability
If conventional bulletproof steel plates are used, then basic protection is provided, but atmospheric corrosion resistance is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by adding Cu (0.20-0.60%) for corrosion resistance while maintaining high strength elements, and optimizes the tempering temperature parameter (180-220°C) to achieve both atmospheric corrosion resistance and tensile strength ≥2000 MPa simultaneously
3Strength
If conventional bulletproof steel plates are used, then basic function is provided, but thickness is insufficient for effective bulletproofing and puncture resistance
Solution Approach 1:
The patent develops a composite steel material with tempered martensite microstructure and optimized alloy composition that achieves tensile strength ≥2000 MPa and Brinell hardness ≥600, enabling effective bulletproofing and puncture resistance at reduced thickness compared to conventional steel plates
Solution Approach 2:
The patent applies parameter changes in chemical composition (high C content 0.35-0.45% for strength) and processing parameters (controlled cooling rate, tempering temperature 180-220°C) to maximize strength-to-thickness ratio, achieving puncture resistance with thinner plates
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 plate achieves a high tensile strength of 2000 MPa, 600 Brinell Hardness, and excellent atmospheric corrosion resistance, meeting FB5 grade standards for bulletproofing and puncture resistance, with a thickness range of 6-22 mm for enhanced performance.
Implementation Method 1
heating at 1130-1250°C followed by rolling
Implementation Method 2
cooling the finish rolled steel plate at a cooling rate of 20°C/s to 460-560°C for coiling
Implementation Method 3
quenching, and low-temperature tempering processes to achieve 2000 MPa tensile strength and 600 Brinell Hardness
Implementation Method 4
low-temperature tempering processes to achieve 2000 MPa tensile strength and 600 Brinell Hardness
Data Source
AI summary
A bulletproof steel plate with a tensile strength of 2000 MPa grade and a Brinell Hardness of 600 grade and a manufacturing method thereof, characterized by that the chemical elements in mass percentage thereof being: 0.35-0.45% of C, 0.80-1.60% of Si, 0.3-1.0% of Mn, 0.02-0.06% of Al, 0.3-1.2% of Ni, 0.30-1.00% of Cr, 0.20-0.80% of Mo, 0.20-0.60% of Cu, 0.01-0.05% of Ti, 0.001-0.003% of B, and the balance being Fe and inevitable impurities. The tensile strength of the steel plate can reach a grade of 2000 MPa and its Brinell Hardness can reach a grade of 600.