Unlock instant, AI-driven research and patent intelligence for your innovation.

Structure micronization pretreatment process of medium-carbon chrome molybdenum vanadium hot work die steel

A technology of hot work die steel and medium carbon chromium molybdenum, which is applied in the field of hot work die steel production to achieve the effect of reducing stress and deformation, improving the effect of grain refinement and improving the segregation of banded structure

Active Publication Date: 2014-12-03
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current conventional pretreatment method is that the workpiece is heated to 850-900°C with the furnace and kept for 1+1min / mm, then cooled with the furnace to 750±20°C and kept for 2+1min / mm, and finally cooled to 500°C with the furnace and air-cooled. Improvement of band segregation and dissolution of hypoeutectic carbides and secondary network carbides has no apparent effect

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 microstructure pretreatment process for medium-carbon chromium-molybdenum-vanadium-based hot work die steel. The model is 1.2343 die-casting die. The size specification is 250mm (thickness) × 710mm (width) × 2500mm (length). Heating in the furnace, heating at 80°C / h to 830°C and then holding for 40s / mm, at the end of the holding, the temperature is raised to 980°C with full power, and after holding at 70s / mm, it is quickly cooled until the final return temperature of the workpiece surface does not exceed 400°C.

[0018] Then heat the workpiece at 60°C / h to 680°C and keep it warm for 100s / mm. After the heat preservation is over, heat it at 80°C / h to 780°C and then keep it warm for 140s / mm. Cool it with the furnace at a speed of 30°C / h to 680°C and then keep it warm. 140s / mm, and finally cooled with the furnace at 50°C / h to 500°C and air-cooled.

[0019] According to the North American Die Casting Association High Quality Die Steel and Die Casting Die Heat Treatment Acc...

Embodiment 2

[0021] A microstructure pretreatment process for medium-carbon chromium-molybdenum-vanadium series hot work die steel, the model is 1.2344 stop mandrel for continuous rolling mill, φ300mm×10500mm, the workpiece is heated in a trolley-type gas furnace at 100℃ After heating up to 840°C / h for 30s / mm, heat up to 1030°C with full power at the end of the heat preservation, and then quickly cool down to the final temperature of the workpiece surface does not exceed 400°C after holding the heat at 80s / mm.

[0022] Then heat the workpiece at 50°C / h to 660°C and keep it for 90s / mm. After the heat preservation is over, heat it at 80°C / h to 760°C and keep it for 150s / mm. Cool it with the furnace at a speed of 25°C / h to 660°C and then hold it. 150s / mm, and finally cooled with the furnace at 40°C / h to 500°C and air-cooled.

[0023] According to the NADCA#207-2006 spectrum of the North American Die Casting Association’s high-quality mold steel and die-casting mold heat treatment acceptance s...

Embodiment 3

[0025] A microstructure pretreatment process for medium carbon chromium molybdenum vanadium series hot work die steel, the model is 1.2367 copper extrusion die, the specification is φ400mm×5000mm, the workpiece is heated in a trolley-type gas furnace, and the temperature is raised at 60°C / h Keep warm for 30s / mm after reaching 850°C, heat up to 1050°C with full power at the end of the hold, and then cool quickly until the final return temperature of the workpiece surface does not exceed 400°C after holding at 80s / mm.

[0026] Then heat the workpiece at 60°C / h to 660°C and keep it warm for 100s / mm. After the heat preservation is over, heat it at 100°C / h to 760°C and then keep it warm for 150s / mm. Cool it with the furnace at a speed of 30°C / h to 660°C and then keep it warm. 150s / mm, and finally cooled with the furnace at 50°C / h to 500°C and air-cooled.

[0027] According to the NADCA#207-2006 diagram of the North American Die Casting Association’s high-quality die steel and die-c...

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 structure micronization pretreatment process of a medium-carbon chrome molybdenum vanadium hot work die steel. The process comprises the following specific steps: (A) high-temperature solution treatment: a workpiece is heated up to the temperature of 800-850 DEG C with the speed not higher than 100 DEG C / h; the temperature of 800-850 DEG C is kept for 30-40 s / mm; after the temperature keeping is finished, the workpiece is heated up to the temperature of 950-1050 DEG C with full power for homogenizing; and after the temperature of 950-1050 DEG C is kept for 60-80 s / mm, the workpiece is quickly cooled to the final return temperature of the workpiece surface not higher than 400 DEG C; and (B) aging and spheroidizing: after the workpiece is heated up to the temperature of 600-700 DEG C with the speed of 50-80 DEG C / h, the temperature of 600-700 DEG C is kept for 90-100 s / mm; after the temperature keeping is finished, the temperature is raised to 760-820 DEG C with the speed of 80-100 DEG C / h, the temperature of 760-820 DEG C is kept for 140-150 s / mm; the workpiece is cooled to the temperature of 600-700 DEG C along with a furnace by the speed of 20-30 DEG C / h; the temperature of 600-700 DEG C is kept for 140-150 s / mm; and finally, the workpiece is cooled to the temperature of 500 DEG C along with the furnace by the speed of 30-50 DEG C / h, and is discharged from the furnace for air cooling. The structure micronization pretreatment process of the medium-carbon chrome molybdenum vanadium hot work die steel, provided by the invention, improves the banded structure segregation, reduces the numbers of hypo eutectic carbides and network carbides, and obtains fine and uniform spheroidizing annealing structures.

Description

technical field [0001] The invention belongs to the technical field of hot work die steel production, and relates to a microstructure pretreatment process for medium carbon chromium molybdenum vanadium series hot work die steel. Background technique [0002] Hot work die steel is mainly used to manufacture dies for hot forming metals in high temperature state, such as hot extrusion dies, die casting dies, hot shear dies, etc. This kind of mold is not only affected by complex stress but also affected by temperature changes during work. Its working conditions are poor, its failure forms are complicated, and its comprehensive performance requirements are high. Therefore, in order to meet the requirements of working conditions, mold materials are required to have excellent mechanical properties and serviceability such as good thermal fatigue resistance, wear resistance, red hardness, high toughness and plasticity, small thermal expansion and good thermal conductivity. . Th...

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): C21D6/00
Inventor 周许王兴旺孙振环陈俸军宛农
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD