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A kind of manufacturing method of 17crnimo6 forging

A manufacturing method and technology for forgings are applied in the field of manufacturing 17CrNiMo6 forgings, which can solve the problems of broken structure and large deformation, improve the tensile properties and elongation, control the depth of the carburized layer, and be beneficial to grain refinement.

Active Publication Date: 2022-07-29
JIANGYIN ZENKUNG FORGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of manufacturing method of 17CrNiMo6 forging, and it has the advantage that adopts high-temperature heat treatment method, avoids producing high-temperature ferrite, and cooperates multiple times of forging large deformation, broken structure, welding Combining internal porosity and casting defects, refining grain structure

Method used

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  • A kind of manufacturing method of 17crnimo6 forging
  • A kind of manufacturing method of 17crnimo6 forging
  • A kind of manufacturing method of 17crnimo6 forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A manufacturing method of 17CrNiMo6 forging, such as figure 1 shown, including the following steps:

[0035] Before forging, prepare the alloy rough billet, including the composition by mass percentage: C: 0.14-0.19; Si: 0.15-0.35; Mn: 0.40-0.60; P≤0.025; S≤0.025; Cr: 1.50-1.80; Ni : 1.40-1.75; Mo: 0.25-0.35; Cu≤0.12; AI≤0.015; the balance is Fe.

[0036] Step S1: the first fire forging, heating the forging blank to 1250°C and holding it for 4 hours, then the forging is hot-cut to the nozzle and riser, the nozzle removal is not less than 4%, and the riser removal is not less than 14%.

[0037] Step S2: the forgings are kept warm, the forgings are heated to 1250°C after being returned to the furnace, and the heat preservation time is ≥5h.

[0038] Step S3: second fire forging, upsetting the forging to a height of 0.5*outer diameter, after the forging is upsetting to the specified height, the press is maintained for 2-3 minutes, and then the eight-way drawing is carried...

Embodiment 2

[0045] The steps different from Example 1 are:

[0046] Step S1: The first fire forging, heating the forging blank to 1237°C and holding the temperature for 5 hours, then the forging is hot-cut to the nozzle and riser, the nozzle removal is not less than 4%, and the riser removal is not less than 14%.

[0047] Step S2: the forgings are kept warm, and the forgings are heated to 1237°C after being returned to the furnace, and the heat preservation time is ≥5h.

[0048] Step S4: the forgings are kept warm, the forgings are heated to 1237°C after being returned to the furnace, and the heat preservation time is ≥10h.

[0049] Step S6: the forging is kept warm, and the forging is kept at 1237°C after being returned to the furnace, and the heat preservation time is less than or equal to 5h.

[0050]Step S8: post-forging heat treatment, the forgings are cooled to 330°C on the surface of the forgings, then enter the furnace, heat up to 400°C for 4 hours, continue to heat up to 650°C f...

Embodiment 3

[0052] The steps different from Example 1 are:

[0053] Step S1: The first fire forging, heating the forging blank to 1260°C and holding it for 5 hours, then hot cutting the nozzle and riser of the forging, the nozzle removal is not less than 4%, and the riser removal is not less than 14%.

[0054] Step S2: the forgings are kept warm, the forgings are heated to 1260° C. and then kept warm for a holding time of ≥5h.

[0055] Step S4: the forgings are kept warm, the forgings are heated to 1260°C after being returned to the furnace, and the heat preservation time is ≥10h.

[0056] Step S6: the forging is kept warm, the forging is kept at 1260°C after being returned to the furnace, and the heat preservation time is less than or equal to 5h.

[0057] Step S8: post-forging heat treatment, the forgings are cooled to 340°C on the surface of the forgings, then enter the furnace, heat up to 420°C for 5 hours, continue to heat up to 670°C for 6 hours, continue to heat up to 970°C for 30...

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Abstract

The invention discloses a method for manufacturing a 17CrNiMo6 forging, the technical scheme of which includes the following steps: Step S1: first fire forging, heating the forging blank to 1235-1260 °C and then keeping it warm; ~1260℃ and then keep warm; Step S3: second fire forging, forging upsetting and Bafang long; Step S4: forging keep warm, forgings heated to 1235~1260℃ after heating; Step S5: third fire forging; Step S6: The forgings are kept warm, and the forgings are kept at 1235-1260°C after being returned to the furnace; Step S7: the fourth fire is formed, the forgings are formed by final forging, and the final forging temperature is ≥ 850°C; Furnace, heat up to 400°C±20°C for insulation, heat up to 650°C±20°C for insulation, heat up to 950°C±20°C for insulation, mist-cool to 580-630°C, turn air-cooled to 280-350°C, put into the furnace, and cool in the furnace Heat preservation at 300 °C, heat preservation at 660 °C ± 20 °C, cooling to below 400 °C, and air cooling.

Description

technical field [0001] The invention relates to the technical field of alloy structural steel processing, in particular to a manufacturing method of a 17CrNiMo6 forging. Background technique [0002] With the development of the times, the industrial level has gradually improved, and the requirements for alloy materials are also getting higher and higher. As a high-strength alloy steel, 17CrNiMo6 has good mechanical properties and toughness. It is widely used in In industrial and mining, shipbuilding, aerospace and other industrial fields, it is often used to prepare gear parts. The current common process in the industry: heating-forging-post-forging heat treatment-sampling-rough turning-inspection, specifically quenching at a temperature of about 820 °C and then tempering at a low temperature of 200 °C for 1-2 hours, but there are the following shortcomings: 1. There are many internal porosity and defects, and the qualified rate of product flaw detection is low; 2. The hard...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44B21J5/00C21D8/00
Inventor 戚振华徐建东马升翼袁震
Owner JIANGYIN ZENKUNG FORGING CO LTD
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