CN105363981A - Method for forging formation of 16Cr3NiWMoVNbE forge piece - Google Patents

Abstract

The invention discloses a method for forging formation of a 16Cr3NiWMoVNbE forge piece. The method comprises the following steps: firstly, taking a 16Cr3NiWMoVNbE steel ingot in certain specification, and heating the steel ingot to reach a required temperature according to a certain heating curve; upsetting the steel ingot, wherein during upsetting, the press amount is 40 to 45 mm each time, after each time of pressing, pausing for 3s to 5s is performed; when the press amount reaches 200 to 250 mm, carrying out rolling drawing; upsetting to reach a required size; and then heating the steel ingot for 10 to 15 min to reach a temperature of 1070 DEG C to 1120 DEG C, and rolling for formation after upsetting and punching. Due to the adoption of the method, low magnitude clear crystal on the 16Cr3NiWMoVNbE steel ingot can be avoided, and meanwhile trace elements in alloy can also be homogenized. The method is used for forging formation of the 16Cr3NiWMoVNbE forge piece.

Description

The forging forming method of 16Cr3NiWMoVNbE forging

Technical field

The present invention relates to a kind of forging method, particularly relate to a kind of forging forming method of 16Cr3NiWMoVNbE forging.

Background technology

16Cr3NiWMoVNbE belongs to the higher gear structural alloy steel of alloying level, containing dystectic strong carbide element such as Cr, W, Mo, V in this alloy, in drawing process, easily form the carbide of high-melting-point, high rigidity, high diffusive degree, thus improve the heat resistance of alloy.And separate out at the intracrystalline of 16Cr3NiWMoVNbE alloy or crystal boundary due to a large amount of carbide, carbide is comparatively obvious to Grain boundary pinning effect, slow down grain growth trend.Simultaneously, this alloy has good quenching degree, higher tensile strength, higher toughness and plasticity, to quench, after lonneal process through carburizing, surface has very high hardness, and the intensity in heart portion, toughness and plasticity coordinate better, be widely used in the aviation gear part manufacturing high rotating speed, heavy load and compact conformation.

, easily there is the problem of the clear crystalline substance of low power in the forging process of 16Cr3NiWMoVNbE forging, adopts after Overheating Treatment, and its low power there is no improves effect.Therefore, need to provide a kind of reasonably manufacturing process, realize the shaping of 16Cr3NiWMoVNbE forging.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of forging forming method of 16Cr3NiWMoVNbE forging, realizes the shaping of 16Cr3NiWMoVNbE forging, improves the forming quality of this forging, avoids occurring the clear brilliant phenomenon of low power.

For solving the problems of the technologies described above, the forging forming method of 16Cr3NiWMoVNbE forging of the present invention, its technical scheme comprises the following steps:

Get the 16Cr3NiWMoVNbE steel ingot of certain specification, put into heating furnace and be heated to 350 DEG C ~ 450 DEG C insulations 3 hours; Again it is warming up to 1020 DEG C ~ 1050 DEG C with the speed of 90 DEG C ~ 100 DEG C, is incubated 3 hours; Again it is warming up to 1200 DEG C ~ 1250 DEG C with the speed of 70 DEG C ~ 80 DEG C, is incubated 3 hours.

By steel ingot vertically on the base plate of forcing press, the upper chopping block of driving pressure machine carries out jumping-up to steel ingot, and the volume under pressure of each jumping-up of upper chopping block is 40mm ~ 45mm, after having pressed down at every turn, and pause 3s ~ 5s; When volume under pressure reaches 200mm ~ 250mm, then carry out round as a ball pulling; Jumping-up is to required size again, obtains 16Cr3NiWMoVNbE steel billet;

Melted down by described steel billet and be heated to 1070 DEG C ~ 1120 DEG C, the heat time is 10min ~ 15min; After jumping-up, punching, roll forming.

Compared with prior art, beneficial effect of the present invention is as follows:

The forging forming method of 16Cr3NiWMoVNbE forging of the present invention, by improving heat time and temperature retention time before forging, what complete steel ingot changes forging, not only avoid 16Cr3NiWMoVNbE forging and occurs the clear crystalline substance of low power, also allows micro-homogenising in alloy simultaneously.Changing in forging process by controlling volume under pressure, make 16Cr3NiWMoVNbE at high temperature discharge stress in time, residual a large amount of residual stress after avoiding forging, and affect the quality of forging.

This forging appearance and size is complete after testing.

There is not the clear crystalline substance of low power in this forging after testing.

The room temperature tensile properties of this forging after testing, its tensile strength is 1396Mpa (being greater than the 1270Mpa of instructions for use), yield strength when its percentage elongation is 0.2% is 1210Mpa (being greater than the 1130Mpa of instructions for use), and elongation after fracture was 12.5% (being greater than 10% of instructions for use).

Above-mentioned testing result shows, adopts this 16Cr3NiWMoVNbE forging property indices all to meet the requirements.

Detailed description of the invention

Implement the forging forming method of 16Cr3NiWMoVNbE forging of the present invention, need to provide the equipment such as forge furnace, forcing press, looping mill, heat-treatment furnace, manipulator.Illustrate embodiments of the present invention below:

The chemical composition of this steel alloy is as follows:

Alloying element	C	Mn	Si	Cr	Ni	Mo	W	V	Nb	S	P
												Percentage composition	0.193	0.64	0.83	2.76	1.26	0.48	1.19	0.43	0.14	0.00015	0.012

The step of this method is as follows:

Get the 16Cr3NiWMoVNbE steel ingot of certain specification, put into heating furnace and be heated to 350 DEG C ~ 450 DEG C insulations 3 hours; Again it is warming up to 1020 DEG C ~ 1050 DEG C with the speed of 90 DEG C ~ 100 DEG C, is incubated 3 hours; Again it is warming up to 1200 DEG C ~ 1250 DEG C with the speed of 70 DEG C ~ 80 DEG C, is incubated 3 hours.

By steel ingot vertically on the base plate of forcing press, the upper chopping block of driving pressure machine carries out jumping-up to steel ingot, and the volume under pressure of each jumping-up of upper chopping block is 40mm ~ 45mm, after having pressed down at every turn, and pause 3s ~ 5s; When volume under pressure reaches 200mm ~ 250mm, then carry out round as a ball pulling; Jumping-up is to required size again, obtains 16Cr3NiWMoVNbE steel billet.

Melted down by described steel billet and be heated to 1070 DEG C ~ 1120 DEG C, the heat time is 10min ~ 15min; After jumping-up, punching, roll forming.

Claims (1)

1. a forging forming method for 16Cr3NiWMoVNbE forging, is characterized in that, comprises the following steps:

Get the 16Cr3NiWMoVNbE steel ingot of certain specification, put into heating furnace and be heated to 350 DEG C ~ 450 DEG C insulations 3 hours; Again it is warming up to 1020 DEG C ~ 1050 DEG C with the speed of 90 DEG C ~ 100 DEG C, is incubated 3 hours; Again it is warming up to 1200 DEG C ~ 1250 DEG C with the speed of 70 DEG C ~ 80 DEG C, is incubated 3 hours.

By steel ingot vertically on the base plate of forcing press, the upper chopping block of driving pressure machine carries out jumping-up to steel ingot, and the volume under pressure of each jumping-up of upper chopping block is 40mm ~ 45mm, after having pressed down at every turn, and pause 3s ~ 5s; When volume under pressure reaches 200mm ~ 250mm, then carry out round as a ball pulling; Jumping-up is to required size again, obtains 16Cr3NiWMoVNbE steel billet;

Melted down by described steel billet and be heated to 1070 DEG C ~ 1120 DEG C, the heat time is 10min ~ 15min; After jumping-up, punching, roll forming.