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

Production method for low carbon high sulfur free-cutting steel with excellent sulfide modality

A technology of free-cutting steel and production method, which is applied in the field of free-cutting steel, can solve problems such as poor cutting performance, and achieve the effects of excellent cutting performance, cost saving and pollution reduction

Active Publication Date: 2014-08-06
ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD
View PDF5 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a production method of low-carbon and high-sulfur free-cutting steel with excellent sulfide form. By controlling the oxygen content in the steel, the continuous casting cooling process and the hot rolling heating process, the low-carbon and high-sulfur free-cutting steel in the prior art can be solved. The problem of poor cutting performance of cutting steel due to poor sulfide morphology

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
  • Production method for low carbon high sulfur free-cutting steel with excellent sulfide modality
  • Production method for low carbon high sulfur free-cutting steel with excellent sulfide modality
  • Production method for low carbon high sulfur free-cutting steel with excellent sulfide modality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of production method of the low-carbon high-sulfur free-cutting steel with excellent sulfide form provided by the present invention, its steps are:

[0036] (1) The carbon content at the end of the electric furnace is 0.05%, and the tapping temperature is 1625°C. The slag is used to tap the steel. During the tapping process, 230kg of silicon manganese, 1500kg of low-carbon ferromanganese, 1000kg of pyrite, and 180kg of phosphorite are added for alloying, and 700kg of special synthetic slag and 100kg of lime are added to make slag.

[0037] (2) The TFe content in the refining slag is 4%, and 80 meters of sulfur cored wire is fed into the furnace in the later stage of refining. Before tapping, the free oxygen content in the molten steel is 70ppm, and the temperature of the tapping molten steel is 1570°C.

[0038] (3) The continuous casting adopts special mold powder for free-cutting steel, the water flow rate of the crystallizer is 1800L / min, the secondary cooling...

Embodiment 2

[0041] A kind of production method of the low-carbon high-sulfur free-cutting steel with excellent sulfide form provided by the present invention, its steps are:

[0042] (1) The carbon content at the end of the electric furnace is 0.05%, and the tapping temperature is 1620°C. The slag is used to tap the steel. During the tapping process, 220kg of silicon-manganese, 1500kg of low-carbon ferromanganese, 1100kg of pyrite, and 200kg of phosphorite are added for alloying, and 700kg of special synthetic slag and 120kg of lime are added to make slag.

[0043] (2) The TFe content in the refining slag is 4%, and 100 meters of sulfur cored wire is fed into the furnace in the later stage of refining. Before tapping, the free oxygen content in the molten steel is 90ppm, and the temperature of the tapping molten steel is 1570°C.

[0044] (3) The continuous casting adopts special mold powder for free-cutting steel, the water flow rate of the crystallizer is 1750L / min, the secondary coolin...

Embodiment 3

[0047] A kind of production method of the low-carbon high-sulfur free-cutting steel with excellent sulfide form provided by the present invention, its steps are:

[0048] (1) The carbon content at the end of the electric furnace is 0.04%, and the tapping temperature is 1630°C. The slag is used to tap the steel. During the tapping process, 220kg of silicon manganese, 1500kg of low-carbon ferromanganese, 1000kg of pyrite, and 180kg of phosphorite are added for alloying, and 700kg of special synthetic slag and 100kg of lime are added to make slag.

[0049] (2) The TFe content in the refining slag is 4%, and 100 meters of sulfur cored wire is fed into the furnace in the later stage of refining. Before tapping, the free oxygen content in the molten steel is 60ppm, and the temperature of the tapping molten steel is 1570°C.

[0050] (3) The continuous casting adopts special mold powder for free-cutting steel, the water flow rate of the crystallizer is 1750L / min, the secondary coolin...

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
diameteraaaaaaaaaa
Brinell hardnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a production method for low carbon high sulfur free-cutting steel with excellent sulfide modality. Under the precondition that all the conventional production conditions are not changed and no other alloying element is added, measures are taken to control total oxygen content at 150-200 ppm, crystallizer water-carrying capacity at 1700-1900 L / min, second cooling zone specific water flow at 0.7-0.9 L / kg, heating furnace temperature at 1230-1280 DEG C, starting rolling temperature at 1100-1130 DEG C, finishing rolling temperature at 1050-1120 DEG C and the like, so as to solve the problem of low cutting performance of low carbon high sulfur free-cutting steel caused by poor sulfide modality in the prior art. Sulfide in free-cutting steel hot rolling steel wires produced by the invention has the characteristics that the mean diameter is greater than or equal to 3 Mu m, the unit area number is greater than or equal to 1000 / mm<2>, the area ratio is greater than or equal to 1.1 %, the sulfide with the length-width ratio greater than or equal to 10 is below 25 %.

Description

technical field [0001] The invention belongs to the field of free-cutting steel, and in particular relates to a production method of low-carbon and high-sulfur free-cutting steel with excellent sulfide form. Background technique [0002] As the degree of automation of machining parts increases, the requirements for cutting performance of processed materials are also increasing. Due to its good comprehensive mechanical properties, high processing efficiency and low processing cost, free-cutting steel is widely used in industries such as automobiles, home appliances, and instruments with a large amount of cutting processing and a high degree of automation. [0003] Sulfur-based free-cutting steel is the most widely used, accounting for 90% of the total free-cutting steel in my country. Sulfur is mainly distributed in free-cutting steel in the form of sulfide, and sulfide inclusions have a very important impact on cutting performance. During the cutting process, the sulfide a...

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 Applications(China)
IPC IPC(8): C22C38/60
Inventor 曹理强贺莹莹李鸿友麻晗
Owner ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD
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