Diffusion Layer Coating for Tubular Gripping Components
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Solution Overview
Problem
Conventional gripping tools for corrosion-resistant alloy (CRA) tubulars face difficulties in penetrating the hard outer layer, leading to slippage and damage, and may transfer ferrous materials, causing corrosion.
Innovation Solution
The use of surface processing methods involving diffusion layers, such as carburizing, boronizing, and chromizing, to enhance the gripping tool's hardness and reduce slippage, while preventing ferrous material transfer, along with toothed gripping surfaces for uniform contact and improved wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional gripping tools are used on CRA tubulars, then the tool structure remains simple and cost-effective, but the tool cannot penetrate the hard outer layer, causing slippage and damage
Solution Approach 1:
The gripping tool undergoes preliminary surface treatment (carburizing, boronizing, chromizing) before use to enhance its gripping capability. This pre-treatment creates a hard outer layer that can effectively penetrate and grip the hard outer layer of CRA tubulars, preventing slippage and damage during operation.
Solution Approach 2:
The surface properties of the gripping tool are fundamentally changed through diffusion-based surface treatments. These processes alter the chemical composition and microstructure of the tool's surface, creating a hardened layer with significantly improved mechanical properties (higher hardness and wear resistance) while maintaining the ductility of the base material.
2Object-affected harmful factors
If conventional gripping tools are used, then manufacturing cost is low, but ferrous material transfer occurs causing corrosion of CRA tubulars
Solution Approach 1:
A non-ferrous diffusion layer (containing boron, chromium, or carbon) is created on the gripping tool surface to act as an intermediary barrier. This layer prevents direct contact between ferrous base material and the CRA tubular, eliminating galvanic corrosion while still providing effective gripping through its hard, wear-resistant properties.
Solution Approach 2:
The gripping tool becomes a composite structure with a ductile ferrous base material and a hard non-ferrous surface layer. This composite construction combines the advantages of both materials: the base provides toughness and ductility, while the surface layer provides corrosion resistance and gripping hardness.
3Strength
If the gripping tool surface is hardened to increase hardness, then gripping performance improves, but the tool may become too brittle and lose ductility
Solution Approach 1:
The gripping tool exhibits local quality differentiation: the surface layer is hardened to high hardness for effective gripping, while the base material remains ductile for overall structural integrity. This gradient in material properties is achieved through controlled diffusion processes that create a transition zone between the hard surface and softer core.
Solution Approach 2:
The surface hardening is performed as a preliminary treatment before the tool enters service. This allows the hard layer to be established while the base material retains its ductility, creating a tool that can withstand both the high stresses of gripping hard CRA tubulars and the impact loads encountered during operation.
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 treated gripping tools effectively penetrate and grip CRA tubulars with reduced slippage and corrosion risk, maintaining ductility and preventing ferrous material transfer, resulting in enhanced gripping performance and longer lifespan.
Implementation Method 1
surface processing methods involving diffusion layers, such as carburizing, boronizing, and chromizing
Implementation Method 2
surface processing methods involving diffusion layers, such as carburizing, boronizing, and chromizing
Implementation Method 3
surface processing methods involving diffusion layers, such as carburizing, boronizing, and chromizing
Implementation Method 4
surface processing methods involving diffusion layers, such as carburizing, boronizing, and chromizing
Implementation Method 5
The outer layer may be heat treated to achieve the desired hardness and mechanical properties
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A gripping tool includes a gripping element and at least one gripping surface formed on the gripping element. The at least one gripping surface includes a plurality of teeth extending from the gripping element an outer layer. A method to surface process a gripping surface of a gripping tool includes providing the gripping surface in an environment comprising a source of additive material and heating the gripping surface at a temperature and a time to diffuse the additive material a depth into the gripping surface to form a diffusion layer.