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

4Cr13 plastic die steel and preparation method thereof

A plastic mold steel, 4cr13 technology, applied in the field of plastic mold steel, can solve the problems of high hardness and difficult cutting process, and achieve the effect of improving cutting performance, reducing hardness and good internal quality

Active Publication Date: 2018-12-18
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
View PDF16 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide 4Cr13 plastic mold steel and its preparation method, to solve the problem that the existing 4Cr13 plastic mold steel has high hardness before pre-hardening, which leads to the difficulty of subsequent cutting and processing

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
  • 4Cr13 plastic die steel and preparation method thereof
  • 4Cr13 plastic die steel and preparation method thereof
  • 4Cr13 plastic die steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] Further, the present invention also provides a method for preparing the 4Cr13 plastic mold steel, which includes the following steps: smelting molten steel with the chemical composition, casting, forging, annealing heat treatment, and pre-hardening treatment.

[0026] The preferred process conditions for the annealing heat treatment step are as follows: first, heat preservation at 780° C. to 820° C. for 8 to 12 hours, and then cool to below 400° C. at a cooling rate of ≤30° C. / h.

[0027] Insulation at 780°C to 820°C for 8 to 12 hours can fully spheroidize or granulate carbides. The investigation shows that too low temperature or too short holding time will lead to insufficient spheroidization of carbides, and too high temperature or too long holding time will cause carbides to aggregate and grow.

[0028] Cooling to below 400°C at a cooling rate of ≤30°C / h can avoid the reduction of strength and toughness due to the presence of retained austenite.

[0029] The preferr...

Embodiment 1

[0033] The preparation of embodiment 1 present invention 4Cr13 plastic mold steel

[0034] Using LF electric arc furnace smelting + electroslag remelting to form Φ880mm electroslag ingot, its chemical composition is shown in Table 1, after forging at 850℃~1200℃ to form a plastic mold steel plate with a thickness of 100mm and a width of 610mm, and then annealing heat treatment + pre-heating Hardening heat treatment.

[0035] Among them, the annealing heat treatment process is: first, heat preservation at 800°C for 10 hours; then cool to 350°C at a cooling rate of 25°C / h, and then cool naturally to room temperature.

[0036] The pre-hardening treatment process is as follows: first heat preservation at 850°C for 8 hours, then cool to 400°C; then heat to 720°C and temper for 22 hours, then cool to 400°C at a cooling rate of 25°C / h, and finally take out the furnace and air cool.

[0037] The metallographic structure of 4Cr13 plastic mold steel produced by this method is martensite...

Embodiment 2

[0039] Embodiment 2 The preparation of 4Cr13 plastic mold steel of the present invention

[0040] Using LF electric arc furnace smelting + VD vacuum degassing, and then pouring into 3.2 tons of flat ingot, its chemical composition is shown in Table 1, after forging at 850 ℃ ~ 1200 ℃ into a plastic mold steel plate with a thickness of 150mm and a width of 610mm, and then annealed Heat treatment + pre-hardening heat treatment.

[0041] Among them, the annealing heat treatment process is: first, heat preservation at 800°C for 12 hours; then cool to 350°C at a cooling rate of 25°C / h, and then cool naturally to room temperature.

[0042] The pre-hardening treatment process is as follows: first, heat preservation at 850°C for 10 hours, then cool to 400°C; then heat to 720°C and temper for 24 hours, then cool to 400°C at a cooling rate of 25°C / h, and finally take out the furnace and air cool.

[0043] The metallographic structure of 4Cr13 plastic mold steel produced by this method i...

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
Thicknessaaaaaaaaaa
Widthaaaaaaaaaa
Login to View More

Abstract

The invention relates to 4Cr13 plastic die steel and a preparation method thereof to solve the problems that existing 4Cr13 plastic die steel is high in hardness before pre-hardening, and therefore sequential cutting machining difficulty is huge, and belongs to the technical field of plastic die steel. According to the technical scheme, the 4Cr13 plastic die steel comprises, by mass, 0.01-0.10% ofMo, and Cr content / C content is no less than 33.5. The pre-hardening plastic die steel fabricated by Mo microalloying+Cr / C controlling has good internal quality, and the cutting machining performanceof the annealing state is improved significantly. According to hardness detecting results, annealing state hardness of the plastic die steel is no more than 200HBW. Compared with the existing 4Cr13 steel, the annealing state hardness is lowered significantly. Hardness after pre-hardening is 30-36 HRC, and the hardness difference to the existing 4Cr13 steel after pre-hardening is not huge.

Description

technical field [0001] The invention relates to 4Cr13 plastic mold steel and a preparation method thereof, belonging to the technical field of plastic mold steel. Background technique [0002] According to the main failure modes (wear, fracture and deformation) and working conditions of plastic molds, the main requirements for performance can be summarized as: necessary wear resistance; easy cutting; good polishing and etching; good thermal conductivity and small thermal expansion; Corrosion resistance, etc. After the plastic mold is forged and rolled into flat material, the hardness of the steel can be reduced by the annealing process to improve the subsequent cutting performance. [0003] 4Cr13 plastic mold steel belongs to the medium-carbon high-chromium corrosion-resistant steel in pre-hardened plastic mold steel. The GB / T 1299-2014 tool and mold steel standard stipulates its chemical composition: carbon 0.36% ~ 0.45%, silicon ≤ 0.60% , manganese ≤ 0.80%, chromium 12.0...

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
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/06C21D1/26C21D1/18
CPCC21D1/18C21D1/26C21D2211/004C21D2211/008C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 王洪利杜思敏
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST 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