Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A smelting method for producing ductile iron castings from scrap steel

A technology for iron castings and scrap steel, applied in the field of iron and steel casting, can solve the problems of large undercooling of molten iron, high hardness of castings, poor inking ability, etc., and achieve the effects of improving elongation, good quality and low cost

Active Publication Date: 2019-01-29
SICHUAN CHUANJIAN PIPES
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts the sequence of high-power high-temperature smelting scrap steel, recarburizer, and slag removal cycle to solve the problems of less spontaneous crystal nuclei, large supercooling degree of molten iron, poor inking ability and high hardness of castings when molten metal solidifies and crystallizes

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 smelting method for producing ductile iron castings from scrap steel
  • A smelting method for producing ductile iron castings from scrap steel
  • A smelting method for producing ductile iron castings from scrap steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] In December, it was proposed to further reduce the amount of pig iron, and to explore the quality of the scrap steel adding recarburizer ductile iron pipes. As of the 25th, the pig iron addition ratio was 26%, of which 9-14 days, a total of 14 shifts, the pig iron addition ≤ 25% There are 5 shifts; ≤20% has 5 shifts; ≤10% has 1 shift; no pig iron has 3 shifts. Spheroidization, metallography, strength, and hardness have basically no obvious changes, but the elongation increases with the increase in the proportion of scrap steel, and the results are shown below.

[0028] 1. Metallographic structure comparison

[0029] There is no difference from normal ingredients, the rate of 2 grades is 99%

[0030] 2. Comparison of mechanical properties

[0031] Table 3 Comparison of mechanical properties from January to December

[0032]

[0033] 3. Specific data will be added on December 9-16

[0034]

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
particle size distributionaaaaaaaaaa
particle sizeaaaaaaaaaa
particle size distributionaaaaaaaaaa
Login to View More

Abstract

The invention relates to the steel casting industry and particularly relates to a melting method for producing a nodular iron casting with waste steel. The melting method comprises processes of waste steel melting and spheroidizing; the waste steel melting process comprises the steps that plain carbon steel and a carburant are added into the furnace bottom, large-power high-temperature melting is performed, the plain carbon steel and the carburant are added while melting is performed, a crushing material and a briquetting material of automobile steel sheets are added in the later period of melting, deslagging is performed, a nucleating agent is added for melting after the recarburization process is completed, samples are taken and analyzed, the contents of C and Si are adjusted, and tapping is performed; and the spheroidizing process comprises the step that molten iron is subjected to magnesium spraying and spheroidizing. The melting method has the following advantages that the cost is low, quality is good, and less waste products are produced.

Description

technical field [0001] The invention relates to the technical field of iron and steel casting, in particular to a smelting method for producing ductile iron castings from scrap steel. Background technique [0002] At present, the foundry industry is facing the reality that the price of furnace materials is rising rapidly, especially the price of pig iron. As the price of steel continues to rise, the price of cast iron is also getting higher and higher. The high price of pig iron and the uneven quality not only increase the production cost of ductile iron pipes, but also greatly affect the quality. Therefore, it is imperative to explore new production processes to improve product quality and reduce production costs. [0003] Traditionally, when electric furnace is used to smelt scrap steel and add recarburizer to produce ductile iron, the product quality obtained is unstable, mainly due to the few spontaneous crystal nuclei during solidification and crystallization of molten...

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): C22C33/12C22C37/04C22C37/10
CPCC22C33/12C22C37/04C22C37/10
Inventor 李晓兵鲜其祥许顺刘杲
Owner SICHUAN CHUANJIAN PIPES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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