Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

A test method for the solid-liquidus temperature of steel samples

A technology of liquidus temperature and test method, applied in the investigation stage/state change and other directions, can solve the problems of metal volatiles easily contaminating the differential scanning calorimeter bracket, unable to provide accurate reference values, unable to meet production needs, etc. Achieve the effect of simple and accurate test method, protection of samples, and low requirements for equipment hardware

Active Publication Date: 2022-04-19
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the applicable model / empirical formula, it is difficult to adapt to all steel types
At the same time, if the composition of new products differs greatly from that of mature products, accurate reference values ​​cannot be provided, and the calculation results of empirical formulas can no longer meet the actual production needs
Patent CN 103235001 B provides a method for measuring the solid-liquidus temperature of steel, but this method has high requirements for equipment hardware configuration, and needs to be equipped with a vacuum system, and the metal volatiles are easy to pollute after the sample is melted at high temperature Differential scanning Calorimeter holders (e.g. samples with aluminum components), causing losses

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A test method for the solid-liquidus temperature of steel samples
  • A test method for the solid-liquidus temperature of steel samples
  • A test method for the solid-liquidus temperature of steel samples

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Select SWRH82A wire rod as the test sample to test its solid-liquidus temperature. The steps are as follows:

[0032] (1) Cut out several 5mg granular samples;

[0033] (2) Clean the oxide skin and pollutants on the surface of the sample, and use a cleaning solution to clean it for 3 minutes at a temperature of 20-30°C to ensure that the oxide skin and pollutants on the surface of the sample are cleaned. The composition of the cleaning solution is as follows: 30-35mL of hydrochloric acid, 20-25mL of sulfuric acid, 12-14mL of ethanol, 0.2-0.3g of hexamethylenetetramine, 24-29mL of hydrogen peroxide, and 10-50mL of distilled water. Soak the cleaned sample in gasoline for 2 minutes, take it out and dry it to prevent the sample from rusting;

[0034] (3) Open the furnace of the differential scanning calorimeter to expose the bracket and the heat sink, install the residual oxygen elimination device into the upper end of the heat sink of the equipment, and spread the sponge zi...

Embodiment 2

[0039] To test the solid-liquidus temperature of W800 silicon steel sheet, the steps are as follows:

[0040] (1) Cut several 10mg granular samples;

[0041] (2) Clean the oxide skin and pollutants on the surface of the sample, and use a cleaning solution to clean it for 5 minutes at a temperature of 20-30°C to ensure that the oxide skin and pollutants on the surface of the sample are cleaned. The composition of the cleaning solution is as follows: 30-35mL of hydrochloric acid, 20-25mL of sulfuric acid, 12-14mL of ethanol, 0.2-0.3g of hexamethylenetetramine, 24-29mL of hydrogen peroxide, and 10-50mL of distilled water. Soak the cleaned sample in gasoline for 3 minutes, take it out and dry it to prevent the sample from rusting;

[0042] (3) Open the furnace chamber of the differential scanning calorimeter, expose the support and heat sink, take out the old zirconium sponge in the circular tray 2, and replace it with an appropriate amount of zirconium sponge;

[0043] (4) Wrap...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for testing the solid-liquidus temperature of a steel sample, which specifically includes the following steps: cleaning the sample with a cleaning solution, wrapping the cleaned sample with a tantalum sheet, preparing a heating process for a differential scanning calorimeter, and finally according to The national standard GB / T1425 analyzes the DSC curve, and the extrapolated starting point temperature of the first endothermic peak in the melting process is determined as the solidus temperature T i , determined as the liquidus temperature T by the last peak temperature in the melting process f . The test method provided by the invention has low requirements on equipment hardware, is simple and accurate, has high efficiency and low cost, and can meet the test requirements of the solid-liquidus temperature of steel samples in the technical field of metal materials.

Description

technical field [0001] The invention belongs to the technical field of thermal analysis of metal materials, in particular to a method for testing the solid-liquidus temperature of steel samples. Background technique [0002] In the current field of metal material research, when formulating a new product smelting process, the liquidus temperature is determined by calculation models or field experience formulas, and then compared with similar mature products to confirm that the liquidus temperature is the temperature that affects the entire smelting process It is an important process parameter for controlling and smelting quality of billets, and requires high accuracy. Due to the limitations of the applicable model / empirical formula, it is difficult to adapt to all steel types. At the same time, if the composition of the new product is quite different from that of the mature product, accurate reference values ​​cannot be provided, and the calculation results of the empirical ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/04
CPCG01N25/04
Inventor 岑风褚峰张继明
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com