Hot Plastic Working Lubricant for 13% Cr Steel
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Solution Overview
Problem
Existing lubricants for hot working, particularly in steel pipe manufacturing, fail to adequately reduce friction and prevent sticking between guide shoes and steel materials, leading to damage and operational issues during the Mannesmann process, especially with hard-workable materials like 13% Cr steel.
Innovation Solution
A lubricant composition comprising 50-80% iron oxide, 20-50% sodium silicate, and 1-20% calcium oxide, with minimal impurities of zinc, lead, and copper oxides, used as an aqueous solution to enhance lubricating properties, feedability, and operability while maintaining corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional lubricants (metal oxide + powder-based anti-sticking material + binder) are used, then basic lubrication is provided, but friction reduction is insufficient for hard-workable materials like 13% Cr steel
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional binder-based formulations with an inorganic slurry system using water or water-soluble organic solvent as carrier, and using specific inorganic materials (iron oxide, calcium oxide, sodium silicate) in optimized proportions to achieve sufficient friction reduction for hard-workable 13% Cr steel while preventing sticking
Solution Approach 2:
The patent creates a composite lubricant system combining multiple inorganic materials (iron oxide as base, calcium oxide for reactivity, sodium silicate for adhesion) with water or water-soluble organic solvent carrier, forming a synergistic composition that provides both friction reduction and sticking prevention capabilities that individual materials cannot achieve alone
2Force
If lubricant composition is optimized for lubricating properties, then friction reduction improves, but feedability and operability may deteriorate
Solution Approach 1:
The patent optimizes the concentration ratios of inorganic materials and carrier fluid to achieve a balance where the slurry has sufficient viscosity for adhesion and friction reduction while maintaining adequate flow characteristics for feedability, and controls water content to prevent roll slipping during operation
3Force
If lubricant remains on product surface after working, then lubricating function is achieved, but corrosion resistance is weakened
Solution Approach 1:
The patent uses water or water-soluble organic solvents as carriers instead of oil-based or corrosive chemical carriers, creating a chemically inert or benign environment that does not promote corrosion on the steel product surface while still providing effective lubrication during the hot working process
Solution Approach 2:
The patent carefully selects and controls the chemical composition of the lubricant, using only corrosion-inert or corrosion-minimal materials (iron oxide, calcium oxide, sodium silicate, water) that leave a protective or neutral residue on the product surface rather than corrosive contaminants
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 lubricant effectively reduces friction, prevents sticking, ensures smooth feedability, and maintains corrosion resistance, making it suitable for hot plastic working processes, particularly in steel pipe manufacturing with Cr-containing steels.
Implementation Method 1
a lubricant for hot plastic working... which reduces the friction between the steel materials such as a billet and pipe to be worked and the guide shoes of a piercer, and preventing the sticking thereof
Data Source
AI summary
[OBJECTIVE] To provide a lubricant for hot plastic working which is excellent in lubricating properties, feedability and operability and will produce no adverse affects on the corrosion resistance of the products. [MEANS FOR SOLUTION] A lubricant for hot plastic working which is characterized in that the composition is comprised of, in an anhydrous condition, 50 to 80% by mass of iron oxide, 20 to 50% by mass of sodium silicate and 1 to 20% by mass of calcium oxide and that the total content of the impurities of zinc oxide, lead oxide and copper oxide is not higher than 5% by mass, where the content of the stabilizer is not counted.. This lubricant is suited for use in lubricating guide shoes in piercing-rolling of high-Cr steel species.