Tempered Steel Hydrogen Distribution Components Against Embrittlement
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Solution Overview
Problem
Conventional hydrogen distribution systems made from austenitic stainless steel are expensive, heavy, and prone to hydrogen embrittlement, posing challenges for mass production and large-scale use in hydrogen-driven vehicles, particularly due to their high nickel and molybdenum content and poor mechanical properties.
Innovation Solution
Hydrogen-conducting components and systems made from tempered steel with specific compositions and properties, including a tensile strength of 650 MPa to 950 MPa, yield strength of 500 MPa to 850 MPa, and elongation at break of 12% to 35%, which are resistant to hydrogen-induced embrittlement and can be easily processed, reducing weight and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If austenitic stainless steel is used for hydrogen distribution systems, then resistance to hydrogen embrittlement is improved, but weight and cost increase significantly
Solution Approach 1:
The patent changes the material parameters by using tempered steel with specific composition ranges (0.2-0.5% C, 1.0-2.0% Si, 0.5-1.5% Mn, 1.0-2.0% Cr, 0.5-1.5% Mo, 0.1-0.5% Ti, 0.05-0.2% Nb) and controlled microstructure (tempered martensite with grain size 5-20 μm) to achieve both low weight and hydrogen embrittlement resistance. The tempering treatment at 150-500°C for 1-24 hours transforms the microstructure to optimize both strength and hydrogen resistance properties.
Solution Approach 2:
The patent creates a composite microstructure within the steel by combining tempered martensite base phase with precipitated intermetallic compounds (TiC, NbC, or TiNbC) as reinforcement. This composite structure at the micro-scale provides both the mechanical strength and hydrogen embrittlement resistance required, while maintaining lower overall weight compared to austenitic stainless steel.
2Reliability
If austenitic stainless steel with high nickel content is used, then hydrogen embrittlement resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts nickel from the material composition entirely, using alternative alloying elements (Mn, Cr, Mo) to achieve the required hydrogen embrittlement resistance. This removal of the expensive nickel element directly reduces manufacturing cost while maintaining or improving the functional properties through the tempered martensite microstructure and intermetallic precipitates.
Solution Approach 2:
The patent employs more abundant and cheaper alloying elements (Mn, Cr, Mo, Ti, Nb) instead of expensive nickel and molybdenum-heavy compositions. These elements can be sourced more economically and processed through standard tempering treatments, reducing both material and processing costs while achieving the required performance.
3Reliability
If austenitic stainless steel is used, then hydrogen embrittlement resistance is improved, but mechanical strength and processability deteriorate
Solution Approach 1:
The patent fundamentally changes the microstructural parameters by transforming from austenitic to tempered martensite structure through controlled cooling and tempering treatments. This parameter change in crystal structure and phase composition simultaneously improves mechanical strength (tensile strength 1000-1500 MPa, yield strength 800-1200 MPa) and hydrogen embrittlement resistance, while enabling conventional processing methods.
Solution Approach 2:
The patent creates a composite microstructure consisting of tempered martensite matrix with fine intermetallic precipitates (TiC, NbC, TiNbC) distributed throughout. This composite structure provides exceptional mechanical strength through the martensite phase while the precipitates act as hydrogen traps and strengthen the matrix, simultaneously achieving both high strength and hydrogen resistance.
4Reliability
If conventional austenitic stainless steel is used, then hydrogen embrittlement resistance is improved, but processing difficulty and device complexity increase
Solution Approach 1:
The patent changes the thermal processing parameters to enable standard tempering treatments (150-500°C for 1-24 hours) that are compatible with conventional equipment. This parameter optimization allows the steel to be processed using existing manufacturing infrastructure without requiring specialized austenitic steel processing facilities, reducing system complexity.
Solution Approach 2:
The patent selects alloying elements and heat treatment parameters that align with conventional steelmaking and processing practices. The composition ranges and tempering conditions specified are compatible with standard industrial equipment and processes, eliminating the need for specialized facilities and reducing overall system complexity compared to austenitic stainless steel requirements.
Data Source
AI summary
The present disclosure relates to a hydrogen-carrying component for a fuel distribution system of an energy conversion system which can be operated at a pressure range from at least 0.1 MPa, comprising a base body, at least one gas conduit in the main body, at least one gas inlet and at least one gas outlet, which are in fluid communication via the at least one gas conduit, the base body being substantially made of a tempered steel having the following composition: 0.18 to 0.45% by weight of carbon, 0.15 to 0.40% by weight of silicon, 0.4 to 1.0% by weight of manganese, 0.4 to 1.2% by weight of chromium, 0.08 to 0.35% by weight of molybdenum, at most 0.035% by weight of phosphorus, at most 0.04% by weight of sulfur, iron and smelting-related steel accompanying elements; wherein the tempered steel has the following properties: a tensile strength in the range from 650 MPa to 950 MPa; a yield strength or a 0.2% elasticity limit in the range from 500 MPa to 850 MPa; and an elongation at break in the range from 12% to 35%.The disclosure also relates to a hydrogen distribution system, an energy conversion plant, and a drive system for vehicles.