Supercharge Your Innovation With Domain-Expert AI Agents!

Method for manufacturing alloy nodular cast iron roll of universal mill

A cast iron roll, universal rolling mill technology, applied in the direction of rolls, metal rolling, manufacturing tools, etc., can solve the problems of poor wear resistance of groove bottom and sides, poor wear resistance of rolls, and large difference in hardness between inside and outside of alloy ductile iron. The effect of simple process and low production cost

Active Publication Date: 2012-01-04
鞍钢轧辊有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Alloy ductile iron BD2 rolls of universal rolling mills used to generally use forged steel rolls, and the wear resistance of the rolls was poor.
In order to improve the wear resistance of the BD2 roll, alloy ductile iron material can be considered. However, the alloy ductile iron material has a large difference in hardness between the inside and the outside. Since the pass of the BD2 roll is relatively deep, the groove bottom and side of the roll with the pass pass are resistant to wear. Poor abrasiveness

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

[0021] The composition of the roll needs to meet the following requirements, in proportion by weight:

[0022] C 3.1~3.3, Si 0.5~1, Mn 0.3~0.4, P<0.1, S<0.03, Cr 0.1~0.3, Ni 2.0~2.4, Mo 0.2~0.4;

[0023] The steps of the heat treatment process are:

[0024] 1) Heating slowly before 200°C, the temperature rise rate is less than or equal to 30°C / h, and keep at 200-300°C for 10 hours;

[0025] 2) Slowly heat at a temperature rise rate of ≤30°C / h, and heat to 400-600°C for 10 hours;

[0026] 3) Slowly heat at a temperature rise rate of ≤30°C / h, and heat to 800-1000°C for 20 hours;

[0027] 4) Then carry out quenching treatment, lower the temperature to 300-400°C within 10 hours, and keep the temperature for 8 hours;

[0028] 5) Tempering is carried out again, and the temperature is raised to 450-650 ° C, and the temperature is kept for 30 hours;

[0029] 6) Cool down at a cooling rate of ≤30°C / h, and release from the furnace.

[0030] According to the manufacturing method of ...

Embodiment 2

[0032] The composition of the roll needs to meet the following requirements, in proportion by weight:

[0033] C 3.3~3.6, Si 1.0~1.5, Mn 0.4~0.7, P<0.1, S<0.03, Cr 0.3~0.5, Ni 2.4~3.0, Mo 0.4~0.6;

[0034] The steps of the heat treatment process are:

[0035] 1) Heating slowly before 200°C, the temperature rise rate is less than or equal to 30°C / h, and keep at 200-300°C for 8 hours;

[0036] 2) Slowly heat at a temperature rise rate of ≤30°C / h, and heat to 400-600°C for 8 hours;

[0037] 3) Slowly heat at a temperature rise rate of ≤30°C / h, and heat to 800-1000°C for 10 hours;

[0038] 4) Then carry out quenching treatment, lower the temperature to 300-400°C within 10 hours, and keep the temperature for 5 hours;

[0039] 5) Tempering is carried out again, and the temperature is raised to 450-650 ° C and kept for 20 hours;

[0040] 6) Cool down at a cooling rate of ≤30°C / h, and release from the furnace.

Embodiment 3

[0042] The composition of the roll needs to meet the following requirements, in proportion by weight:

[0043] C 3.5~3.6, Si 0.5~1.0, Mn 0.3~0.5, P<0.1, S<0.03, Cr 0.1~0.3, Ni 2.6~3.0, Mo 0.5~0.6;

[0044] The steps of the described heat treatment process are:

[0045] 1) Slowly heat before 200℃, the temperature rise rate is less than or equal to 30℃ / h, and keep at 200-300℃ for 12 hours;

[0046] 2) Slowly heat at a temperature rise rate of ≤30°C / h, and heat to 400-600°C for 12 hours;

[0047] 3) Slowly heat at a temperature rise rate of ≤30°C / h, and heat to 800-1000°C for 30 hours;

[0048] 4) Then carry out quenching treatment, lower the temperature to 300-400°C within 10 hours, and keep the temperature for 10 hours;

[0049] 5) Tempering is carried out again, and the temperature is raised to 450-650 ° C, and the temperature is kept for 40 hours;

[0050] 6) Cool down at a cooling rate of ≤30°C / h, and release from the furnace.

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

No PUM Login to View More

Abstract

The invention relates to a method for manufacturing an alloy nodular cast iron roll of a universal mill. The method comprises the following steps of smelting, spheroidizing and inacubating of molten iron, casting the rolls, cooling and unpacking, and pre-opening hole patterns, and adopts a heat treatment process after the pre-opening of the hole patterns, so that after the roll is subjected to high temperature austenization and homogenization and is quickly cooled, matrix structures of the slot bottom and lateral surfaces of the slotted roll are refined to meet the requirements of the slot bottom and the lateral surfaces of the roll on wear resistance. The method adopts the heat treatment process after the pre-opening of the hole patterns, so that after the roll is subjected to high temperature austenization and homogenization and is quickly cooled, matrix structures are refined, and the wear resistance of the slot bottom and the lateral surfaces of the roll is greatly improved.

Description

technical field [0001] The invention relates to a method for manufacturing a cast iron roll, in particular to a method for manufacturing an alloy ductile iron roll for a universal rolling mill. Background technique [0002] Universal rolling mill alloy ductile iron BD2 rolls were originally made of forged steel rolls, and the wear resistance of the rolls was poor. In order to improve the wear resistance of the BD2 roll, the alloy ductile iron material can be considered. However, the inner and outer hardness of the alloy ductile iron material has a large difference. Because the hole type of the BD2 roll is relatively deep, the groove bottom and sides of the hole type roll are resistant to resistance. Poor abrasiveness. SUMMARY OF THE INVENTION [0003] In order to overcome the defects of the prior art, the purpose of the present invention is to provide a method for manufacturing an alloy ductile iron roll for a universal rolling mill. The method adopts a heat treatment pro...

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): C21D9/38C22C37/10C21D5/00C21D1/25B21B27/02
Inventor 艾忠诚李凯杜立朝
Owner 鞍钢轧辊有限公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com