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Mould material for high-strength forging and preparation method thereof

A mold material and high-strength technology, applied in the field of mold steel, can solve the problems of short life and cracks, and achieve the effect of prolonging the service life, strengthening the dispersion effect, and reducing the tendency of cracks.

Active Publication Date: 2015-07-01
MAANSHAN ZHIYUAN FORGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the fact that the performance requirements of forging blanks are getting higher and higher, and the mold materials and processing methods in the prior art have defects such as cracks and short life in the forging process, the present invention provides a mold for high-strength forging The material and its preparation method have no cracks in the mold after forging, the grain size is fine, and the service life is prolonged

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A mold material for high-strength forging, its constituent elements and weight percentages are: C: 0.36%; Si: 0.50%; P≤0.035%; S≤0.010%; Cr: 7.6%; Mo: 4.7%; V : 2.6%; the rest is Fe.

[0029] The preparation method of the mold material for high-strength forging, the steps are:

[0030] 1) The raw materials are prepared according to the formula of C: 0.36%; Si: 0.50%; P≤0.035%; S≤0.010%; Cr: 7.6%; Mo: 4.7%; V: 2.6%; the rest is Fe to prepare the blank;

[0031] 2) Smelting Φ300 electroslag ingot according to the formula, 342mm length of the 190KG blanking material is put into the furnace for heating, the first step is to forge along the direction of the steel ingot to 600*200*200mm; the second step is to forge the direction of the steel ingot to 400*250* 220mm; the third step is to forge the steel ingot in the same direction to 700*225*125mm; to obtain the forged blank;

[0032] 3) Preheat the forged blank obtained in step 2) to 500°C, keep it warm for 40 minutes, then...

Embodiment 2

[0036] Same as Example 1, the difference is that the constituent elements and weight percentage of the test material are: C: 0.37%; Si: 0.40%; P≤0.035%; S≤0.010%; Cr: 7.1%; Mo: 5.0%; V: 2.1%; the rest is Fe; 1) Smelting Φ300 electroslag ingot according to the formula; 2) Blanking 210KG about 378mm long into the furnace for heating, the first step is to forge 600*215*215mm along the direction of the steel ingot, the second step, Forging the steel ingot with the same direction to 400*250*250mm, the third step is to forge the steel ingot with the same direction to Φ308*280*280mm; get the blank after forging; step 3) Preheat the blank to 450°C, hold it for 55min, and then heat it to 850°C, keep warm for 60min; then heat to 1050°C, keep warm for 50min, control the heating rate at 30°C / min for quenching, the quenching is water quenching, the water quenching adopts the quenching agent in the patent No. 201310350402.X embodiment 2; step 4) In the process, the workpiece was heated to 4...

Embodiment 3

[0038]Same as Example 1, the difference is that the constituent elements and weight percentage of the test material are: C: 0.38%; Si: 0.30%; P≤0.035%; S≤0.010%; Cr: 6.8%; Mo: 5.4%; V: 1.8%; the rest is Fe; 1) smelting Φ300 electroslag ingot according to the formula, 2) blanking 160KG about 288mm long into the furnace for heating, the first step is to forge 600*225*150mm along the direction of the steel ingot, the second step, Forge the steel ingot with the same direction to 400*300*160mm, the third step is to forge the steel ingot with the same direction to 555*255*125mm; get the blank after forging; step 3) Preheat the blank to 450°C, keep it warm for 70min, and then heat it to 860 ℃, heat preservation 40min; Then be heated to 1030 ℃, heat preservation 60min, heating rate is controlled at 26 ℃ / min; Quenching is water quenching, and water quenching adopts the quenchant in the patent No. 201310350402.X embodiment 2; Step 4) will The workpiece was heated to 550°C, held for 180 ...

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Abstract

The invention discloses a mould material for high-strength forging and a preparation method thereof and belongs to the field of mould steel. The material for high-strength forging is composed of the following elements by weight percent: 0.36-0.38% of C, 0.30-0.50% of Si, less than or equal to 0.035% of P, less than or equal to 0.010% of S, 6.8-7.6% of Cr, 4.7-5.4% of Mo, 1.8-2.6% of V and the balance of Fe. The preparation method of the mould material comprises the following steps: (1) smelting an electroslag steel ingot according to the formula and forging a forging blank; (2) machining; (3) heating a workpiece to the temperature of 1030-1080 DEG C, and quenching; and (4) heating the workpiece to the temperature of 400-550 DEG C. By utilizing the second phase intensifying and dispersion strengthening, the cracking tendency is reduced, the forging process is benefited, furthermore the anti-fatigue performance is increased and the service life of the workpiece is prolonged.

Description

technical field [0001] The invention belongs to the field of die steel, and in particular relates to a die material for high-strength forging and a preparation method thereof. Background technique [0002] Die steel is a type of steel used to make molds such as cold stamping dies, hot forging dies, and die casting dies. The quality of the mold directly affects the quality of the pressure processing process, the precision output of the product and the production cost, while the quality and service life of the mold are mainly affected by the mold material itself and the heat treatment process in addition to the reasonable structural design and processing accuracy. [0003] Die steel can be roughly divided into three categories: cold-rolled die steel, hot-rolled die steel and plastic die steel. The most common ones are used for forging, stamping, cutting, die-casting, etc. Due to the different uses of various molds and complex working conditions, the steel for molds should hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C21D8/00
CPCC21D1/18C21D1/74C22C38/02C22C38/12C22C38/18
Inventor 张道恩
Owner MAANSHAN ZHIYUAN FORGING CO LTD
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