Forging and thermal treatment technique for Cr12MoV steel

A kind of technology, forging ratio technology, applied in the technology field of forging technology field, can solve the problems such as cracks, can not eliminate large eutectic carbide, can not be used, etc.

Inactive Publication Date: 2017-01-11
瑞安市劲力机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In production, often because the traditional process cannot eliminate large eutectic carbides or severe network carbides, the molds made of this material will crack after being used for

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] Embodiment: be the technology of Cr12MoV steel for material, comprise following operation:

[0016] (1) A regenerative heating furnace with PLC four-point temperature control is selected. The heating process is 3 processes. First, it is heated to 550°C, and then the temperature is raised from 550°C to 850°C at a uniform speed, and the heating rate is maintained at 80-90°C / h. Insulate at 850°C for 8 hours, then heat up to 1100-1150°C;

[0017] (2) The initial forging temperature is 1100-1150°C, and the final forging temperature is 850-880°C;

[0018] (3) Quenching in an oil or salt bath to 1100-1150°C and holding for 15 minutes;

[0019] (4) cooling;

[0020] (5) Carry out 3-stage isothermal spheroidization at 720°C→740°C→720°C, each stage is 2h;

[0021] (6) Tempering at 220°C;

[0022] (7) Take it out of the oven and let it cool naturally in the air.

[0023] For the Cr12MoV steel, a six-sided piercing method is adopted, including three piers and three piercings, ...

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PUM

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Abstract

The invention discloses a forging and thermal treatment technique for Cr12MoV steel. The forging and thermal treatment technique specific for Cr12MoV steel comprises the following working procedures that a PLC four-point temperature-controlled regenerative heating furnace is selected and applied, and the heating process is divided into three stages, specifically, heating is carried out till the temperature is 550 DEG C firstly, the temperature is increased from 550 DEG C to 850 DEG C at a uniform speed, the temperature increasing speed is kept to be 80-90 DEG C per hour, the temperature is kept at 850 DEG C for eight hours, and then the temperature is increased to 1100-1150 DEG C; the initial forging temperature is 1100-1150 DEG C, and the final forging temperature is 850-880 DEG C; oil or salt bath quenching is carried out till the temperature is 1100-1150 DEG C, and the temperature is preserved for 15 min; cooling is carried out; three sections of isothermal spheroidizing at the temperatures of 720 DEG C, 740 DEG C and 720 DEG C separately are carried out, and each section lasts for two hours; tempering is carried out at the temperature of 220 DEG C; and the steel is discharged out of a furnace and placed in air for natural cooling. Processing molds for the technique can make carbide refined, edges and corners round and Austenite matrixes superfine, and high hardness and compressive strength are achieved.

Description

technical field [0001] The invention relates to a process in the technical field of forging, in particular to a forging process. Background technique [0002] Cr12MoV steel is a high-Gr micro-deformation cold work die steel widely used in my country. It belongs to ledeburite steel. The structure of eutectic carbide dendrites is very developed. These carbides are characterized by high melting point, hard and brittle, and extremely poor plasticity. The thermal conductivity of this steel is poor, and there are two contradictory factors at work in the forging process. On the one hand, the carbides are broken up by the blow of the forging hammer. If the final forging temperature is too low, the austenite is seriously deformed and Work hardening occurs, on the other hand, the forging temperature is high, the melting point of the eutectic carbide accumulation is low, the hammering is too strong, the forging temperature rises to make the local microscopic area of ​​the workpiece ris...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D1/18
CPCC21D8/005C21D1/18C21D2211/001C21D2211/004
Inventor 卢劲松
Owner 瑞安市劲力机械制造有限公司
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