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

Carburizing bainite steel and manufacturing method thereof

A technology of carbon bainite steel and manufacturing method, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of poor toughness and plasticity, and achieve good toughness of the core and simple process , the effect of high surface hardness

Inactive Publication Date: 2011-11-16
WUHAN UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the disclosed carburized steel is strengthened with refined martensite structure, the surface structure is high carbon martensite, a small amount of retained austenite and carbide, and the surface carburized layer has high hardness, wear resistance and fatigue limit; The core structure is low carbon martensite or low carbon martensite and ferrite, the toughness and plasticity are not very good

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for manufacturing carburized bainitic steel. The chemical composition and content of the slab are: C is 0.08-0.12wt%, Si is 1.50-1.80wt%, Mn is 1.60-1.90wt%, Cr is 1.30-1.60wt%, Mo is 0.30-0.60wt%, Al is 0.05-0.60wt%, P<0.015wt%, S<0.010wt%, and the rest is Fe and unavoidable impurities. The sum of the contents of Si, Mn, Cr, Mo and Al in the slab is less than 6.00wt%.

[0018] After molten iron is made and refined, die casting, hot rolling, carburizing and heat treatment are carried out. Hot rolling is to heat the cast slab at 1200-1250°C for 2.0-3.0 hours, then roll it and cool it naturally; the process of carburizing and heat treatment is: first cool the cooled steel plate at 850-950°C Austenitizing for 0.4-0.6 hours; then surface carburizing at 800-900°C for 60.0-80.0 hours with nitrogen and methanol as the atmosphere, the volume content of nitrogen is 35-40%, and the volume content of methanol is 60-65 %; then keep it warm for 120.0-240.0 hours under th...

Embodiment 2

[0021] A method for manufacturing carburized bainitic steel. The chemical composition and content of the slab are: C is 0.08-0.12wt%, Si is 1.50-1.80wt%, Mn is 1.60-1.90wt%, Cr is 1.30-1.60wt%, Mo is 0.30-0.60wt%, Al is 0.60-1.20wt%, P<0.015wt%, S<0.010wt%, and the rest is Fe and unavoidable impurities. The sum of the contents of Si, Mn, Cr, Mo and Al in the slab is less than 6.00wt%.

[0022] After steelmaking and refining, scrap steel is subjected to die casting, hot rolling, carburizing and heat treatment. Hot rolling is to heat the cast slab at 1200-1250°C for 2.0-3.0 hours, then roll it and cool it naturally; the process of carburizing and heat treatment is: first cool the cooled steel plate at 850-950°C Austenitizing for 0.4-0.6 hours; then surface carburizing at 800-900°C for 60.0-80.0 hours with nitrogen and methanol as the atmosphere, the volume content of nitrogen is 35-40%, and the volume content of methanol is 60-65 %; then keep it warm for 2.0 hours to 4.0 hour...

Embodiment 3

[0025] A method for manufacturing carburized bainitic steel. The chemical composition and content of the slab are: C is 0.04-0.08wt%, Si is 1.20-1.50wt%, Mn is 1.90-2.20wt%, Cr is 1.00-1.30wt%, Mo is 0.10-0.30wt%, Al is 0.05-0.60wt%, P<0.015wt%, S<0.010wt%, and the rest is Fe and unavoidable impurities. The sum of the contents of Si, Mn, Cr, Mo and Al in the slab is less than 6.00wt%.

[0026] After molten iron is made and refined, die casting, hot rolling, carburizing and heat treatment are carried out. Hot rolling is to firstly heat the billet at 1150-1200°C for 2.0-3.0 hours, then roll it and cool it naturally; the process of carburizing and heat treatment is: first cool the cooled steel plate at 950-1050°C Austenitizing for 0.2-0.4 hours; then surface carburizing with nitrogen and methanol as the atmosphere at 700-800°C for 80.0-100.0 hours, the volume content of nitrogen is 40-45%, and the volume content of methanol is 55-60 %; then keep warm for 10.0-120.0 hours under...

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
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention relates to carburizing bainite steel and a manufacturing method thereof. The technical proposal is as follows: the casting billet comprises the chemical components with the contents as follows: 0.04-0.12wt% of C, 1.20-1.80wt% of Si, 1.60-2.20wt% of Mn, 1.00-1.60wt% of Cr, 0.10-0.60wt% of Mo, 0.05-1.20wt% of Al, P less than 0.015wt%, S less than 0.010wt% and the balance Fe and inevitable impurities. The method is characterized by carrying out hot rolling and cooling after steel making and refining; austenitizing the cooled steel plates at the temperature of 850-1050 DEG C for 0.2-0.6h; then case carburizing the steel plates at the temperature of 700-900 DEG C in the nitrogen methanol atmosphere for 60.0-100.0h; insulating the steel plates at the temperature of 200-500 DEG C in the nitrogen atmosphere for 10.0-240.0h or insulating the steel plates at the temperature of 200-500 DEG C in the nitrogen atmosphere and in the strong magnetic field of 8-12T for 1.0-4.0h and furnace-cooling the steel plates to the room temperature. The invention has the characteristics of high surface hardness and good core toughness.

Description

technical field [0001] The invention belongs to the technical field of bainite steel. In particular, it relates to a carburized bainite steel and a manufacturing method thereof. Background technique [0002] After carburizing and heat treatment of alloy steel, the carburized layer has high hardness, wear resistance, high bending strength and fatigue strength, while the core has high toughness and sufficient yield strength to prevent parts from being damaged due to The transition zone and the core are deformed and destroyed. [0003] At present, in the development of carburizing steel, in order to improve the strength and hardness, martensite is usually used as the main matrix structure, and various refinement methods and methods are used to obtain high toughness. Many beneficial explorations and developments have been carried out at home and abroad, and a number of research results and patented technologies have been formed. Analyzing the high-strength carburizing steel 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 Patents(China)
IPC IPC(8): C22C38/38C21D8/02C23C8/22C23F17/00
Inventor 吴开明胡锋
Owner WUHAN UNIV OF SCI & TECH
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