CN104745780B - Production method for forging and thermally treating Cr12MoV steel - Google Patents

Production method for forging and thermally treating Cr12MoV steel Download PDF

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Publication number
CN104745780B
CN104745780B CN201510115105.6A CN201510115105A CN104745780B CN 104745780 B CN104745780 B CN 104745780B CN 201510115105 A CN201510115105 A CN 201510115105A CN 104745780 B CN104745780 B CN 104745780B
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drafts
blank
forging
temperature
pulling
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CN201510115105.6A
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CN104745780A (en
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董绍国
李旭
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辽宁金钢重型锻造有限公司
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Abstract

The invention relates to a production method for forging and thermally treating Cr12MoV steel. According to the production method, sectional heating is adopted and a heating speed is controlled, when a blank is charged, a temperature in a furnace is 300-400 DEG C, heat is insulated for 3-4h after the charging, then the temperature rises to 850-880 DEG C at a speed of 40-50 DEG C/h, heat is insulated for 3-4h, then the temperature rises to 1100-1130 DEG C at a speed of 60-80 DEG C/h, and heat is insulated for 4-5h; the blank is subjected to 5-6 times of axial repeated upsetting and drawing-out during a forging process; a rolling reduction is controlled according to the temperature of the blank, and normalizing and spheroidizing annealing treatments are carried out after the forging. The yield of the Cr12MoV steel forged pieces produced by the production method disclosed by the invention is increased to 90-100% from the original 40-50%; network carbides and band carbides are eliminated; the unevenness of eutectic carbides is improved to 1-2 levels from the original 5-6 levels, and the production costs of forged piece production enterprises and the procurement costs of using units for the forged pieces are reduced, therefore, waste for social resources and pollution for environment are also reduced.

Description

A kind of Cr12MoV steel forgings make and heat treatment production method

Technical field

The present invention relates to a kind of Cr12MoV steel forgings make and heat treatment production technology and technology field.More particularly to The heating of Cr12MoV steel forgings, forging and heat treatment after forging process.

Background technology

Cr12MoV steel belongs to ledeburite cold work die steel in high alloy through, is usually used in cold roll collars.Due to the steel contain it is higher Carbon and chromium, the product produced using traditional process for forging, it is easy to produce burning in heating process, forging Crack in journey and cause waste product.The internal soundness of forging product is also poor, easily residual net carbide or Cold Roll, altogether Brilliant Carbide Nonuniformity is more serious.

Patent CN1727502A discloses the forging method of Cr12MoV steel.Its shortcoming is:

1. when heating-up temperature reaches 1150~1300 DEG C, overheated or burning is also easy to produce, is easily produced in blank surface during forging Crackle causes waste product.

2. after forging, directly slow cooling, to 100 DEG C, does not carry out heat treatment after forging, and the elimination to net carbide is not thorough.

3. pair forging deformation amount is not controlled, and easily produces forge crack and causes waste product.

Patent CN101748251A discloses a kind of forging method of Cr12MoV cold work die steel modules.Its shortcoming is:

1., when heating-up temperature reaches 1190~1220 DEG C, it is overheated to be also easy to produce.

2. after forging, directly slow cooling, to 100 DEG C, does not carry out heat treatment after forging, and the elimination to net carbide is not thorough.

3. pair forging deformation amount is not controlled, and easily produces forge crack and causes waste product.

Forging yield rate is low, forging process is wayward, forging quality is unstable, increased forging manufacturing enterprise and forging Using the production cost of enterprise, the waste and the pollution to environment of a large amount of social resources is also result in.

The content of the invention

The technical problem to be solved is to overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of Cr12MoV steel forgings make and heat treatment production method, improve forging yield rate, eliminate netted or Cold Roll, improve eutectic Carbide Nonuniformity.

For achieving the above object, the present invention employs the following technical solutions realization:

A kind of Cr12MoV steel forgings make and heat treatment production method, using zone heating and control programming rate, forged Normalizing is carried out after drafts, forging are controlled by blank temperature in journey and spheroidizing is processed.Concrete operation step is:

(1) heating period:During blank shove charge, 300~400 DEG C of in-furnace temperature is incubated 3~4h after shove charge, then with 40~50 DEG C/speed of h is raised to 850~880 DEG C, and 3~4h is incubated, then 1100~1130 DEG C is raised to the speed of 60~80 DEG C/h, insulation 4 ~5h;

(2) forge the stage:5~6 axial direction jumping-up, pullings repeatedly are carried out to blank;

Blank periphery one time, drafts 10~20mm are touched before jumping-up first;

2~5 slow pressures of jumping-up time-division, each 50~100mm of drafts, upset ratio are 2~3;

Drafts is determined according to the temperature of blank during pulling, pulling is than being 5~8;

1100 DEG C of 1050 DEG C≤blank temperature <, 10~20mm of drafts;

1050 DEG C of 950 DEG C≤blank temperature <, 30~50mm of drafts;

950 DEG C of 900 DEG C≤blank temperature <, 10~20mm of drafts;

Between 20~30%, final forging temperature is 900 DEG C~950 DEG C to deformation amount controlling of last fire time;

(3) heat treatment stages:Normalizing is carried out after forging and spheroidizing is processed;

After forging blank charging temperature be 300~350 DEG C, be raised to 890~910 DEG C with the speed of 40~60 DEG C/h, insulation 3~ Air cooling to 380~400 DEG C after 4h, is incubated 3~4h, then is raised to 850~870 DEG C with the speed of 50~60 DEG C/h, after 3~4h of insulation Air cooling to 720~740 DEG C, is as cold as 400 DEG C with the speed stove of 10~20 DEG C/h after 5~6h of insulation again, and then air cooling is to room temperature.

Compared with prior art, the invention has the beneficial effects as follows:

1. the temperature that mode of heating of the present invention can guarantee that the heating-up temperature uniformity of blank and make blank in heating process Degree stress tends to minimum, prevents blank from producing overheated or burning;

2. touch blank periphery the net carbide of blank surface can be smashed before jumping-up, prevent face crack; Determine that drafts can make the deformation comparison of blank uniform according to the temperature of blank when 2~5 slow pressures of jumping-up time-division and pulling, favorably In blank, the distribution of eutectic carbide is more uniform;The deflection of the axial jumping-up of control, pulling number of times and last fire time can Carbide in blank is constantly crashed to pieces, crystal grain it is more tiny;

3. heat treatment after forging can eliminate the remaining net carbide in forging, be in granular form carbide, tiny, uniform point Cloth.

The Cr12MoV steel forgings of present invention production, yield rate bring up to 90~100% by original 40~50%;Eliminate Net carbide and Cold Roll;The irregularity of eutectic carbides is improved as 1~2 grade by original 5~6 grades, reduces The production cost and forging of forging manufacturing enterprise using unit purchase cost, therefore decrease the waste to social resources and Pollution to environment.

Description of the drawings

Fig. 1 is one Cr12MoV steel ingot blank heating process curve figures of embodiment.

Fig. 2 is normalizing and annealing process curve chart after the forging of one Cr12MoV steel forgings of embodiment.

Fig. 3 is two Cr12MoV steel ingot blank heating process curve figures of embodiment.

Fig. 4 is normalizing and annealing process curve chart after the forging of two Cr12MoV steel forgings of embodiment.

Specific embodiment

With reference to embodiment, the present invention is further described:

The chemical composition (mass fraction %) of Cr12MoV is shown in Table one.

Table one:

Cr12MoV steel gas contents (ppm) is shown in Table two.

Table two:

[O] [H] ≤15 ≤1.5

A kind of Cr12MoV steel forgings make and heat treatment production method, using zone heating technique, axially repeatedly jumping-up, pull out Long technique, after being forged, normalizing and spheroidizing are processed.

Embodiment one

To forge external diameter as Φ 560mm, internal orifice dimension is Φ 240mm, as a example by thickness is for the cold roll collars of 280mm, specifically Operating procedure is:

(1) steel ingot is adopted for raw material, during shove charge, 300~400 DEG C of in-furnace temperature is incubated 4h after shove charge, then with 40~50 DEG C/speed of h is raised to 850~870 DEG C, 4h is incubated, then 1110~1130 DEG C is raised to the speed of 60~70 DEG C/h, be incubated 5h, Then come out of the stove forging.

(2) axially jumping-up, pulling repeatedly is carried out to blank;Blank periphery one time touched before jumping-up first, drafts 10~ 20mm。

During jumping-up, point 5 slow pressures, each 50~80mm of drafts, upset ratio is 2.3.When once pulling out, blank temperature Spend for 1080 DEG C, 10~20mm of drafts, pulling ratio are 1.5;During secondary jumping-up, points of 4 times slow pressures, each drafts 70~ 100mm.During secondary pulling, blank temperature is 1040 DEG C, 30~50mm of drafts, and pulling is than being 1.5;During three jumping-ups, divide 3 times Slow pressure, each 70~100mm of drafts.During three pullings, blank temperature is 1000 DEG C, 30~50mm of drafts, and pulling ratio is 2;Blank is divided into into 2 sections after three pullings, axially jumping-up, pulling repeatedly is carried out respectively to per section;

Blank after segmentation carry out four times it is upset when, points of 3 times slow pressures, each 50~80mm of drafts, during four pullings, base Material temperature degree is 1050 DEG C, 10~20mm of drafts.Pulling is than being 2.Five times it is upset when, points of 3 times slow pressures, each drafts 50~ 70mm, during five pullings, blank temperature is 1000 DEG C, 30~50mm of drafts, and pulling is than being 1.5;Six times it is upset when, points 2 times Slow pressure, each 50~80mm of drafts.Deformation amount controlling of last fire time between 20~30%, 900 DEG C of final forging temperature~ 950℃。

(3) normalizing is carried out after forging and spheroidizing is processed.After forging, blank charging temperature is 300~350 DEG C, with 40~60 DEG C/speed of h is raised to 890~910 DEG C, air cooling to 380~400 DEG C after insulation 4h is incubated 4h, then with the speed of 50~60 DEG C/h 850~870 DEG C are raised to, air cooling to 720~740 DEG C after insulation 4h is as cold as 400 with the speed stove of 10~20 DEG C/h after insulation 6h again DEG C, then air cooling is to room temperature.

Embodiment two

To forge external diameter as Φ 400mm, internal orifice dimension is Φ 140mm, as a example by thickness is for the cold roll collars of 265mm, specifically Operating procedure is:

(1) steel ingot is adopted for raw material, during shove charge, 300~400 DEG C of in-furnace temperature is incubated 3h after shove charge, then with 40~50 DEG C/speed of h is raised to 860~880 DEG C, 4h is incubated, then 1100~1130 DEG C is raised to the speed of 70~80 DEG C/h, be incubated 4h, Then come out of the stove forging.

(2) axially jumping-up, pulling repeatedly is carried out to blank;Blank periphery one time touched before jumping-up first, drafts 10~ 20mm。

During jumping-up, point 4 slow pressures, each 60~90mm of drafts, upset ratio is 2.When once pulling out, blank temperature For 1050 DEG C, 10~20mm of drafts, pulling ratio are 1.4;During secondary jumping-up, point 3 slow pressures, each 80~100mm of drafts. During secondary pulling, blank temperature is 1000 DEG C, 40~50mm of drafts, and pulling is than being 1.5;During three jumping-ups, point 3 slow pressures, 80~100mm of each drafts.During three pullings, blank temperature is 980 DEG C, 30~40mm of drafts, and pulling is than being 1.6;Three Blank is segmented after secondary pulling, carries out axially jumping-up, pulling repeatedly respectively to per section;

Blank after segmentation carry out four times it is upset when, points of 4 times slow pressures, each 60~80mm of drafts, during four pullings, base Material temperature degree is 1100 DEG C, 10~20mm of drafts.Pulling is than being 1.5.Five times it is upset when, points of 3 times slow pressures, each drafts 50~ 70mm, deformation amount controlling of last fire time between 25~30%, 900 DEG C~950 DEG C of final forging temperature.

(3) normalizing is carried out after forging and spheroidizing is processed.After forging, blank charging temperature is 300~350 DEG C, with 40~60 DEG C/speed of h is raised to 890~910 DEG C, air cooling to 380~400 DEG C after insulation 3h is incubated 3h, then with the speed of 50~60 DEG C/h 850~870 DEG C are raised to, air cooling to 720~740 DEG C after insulation 3h is as cold as 400 with the speed stove of 10~20 DEG C/h after insulation 5h again DEG C, then air cooling is to room temperature.

Described above is only the ultimate principle of the present invention, and not the present invention is imposed any restrictions, every right according to the present invention Which carries out equivalent variations and modification, within the category of the art of this patent protection scheme.

Claims (2)

1. a kind of Cr12MoV steel forgings make and heat treatment production method, including the heating period, forging the stage, heat treatment stages, plus Hot stage zone heating simultaneously controls programming rate:During blank shove charge, 300~400 DEG C of in-furnace temperature is incubated 4h after shove charge, then with The speed of 40~50 DEG C/h is raised to 850~870 DEG C, is incubated 4h, then is raised to 1110~1130 DEG C with the speed of 60~70 DEG C/h, protects Warm 5h, forging of then coming out of the stove, it is characterised in that after controlling drafts, forging by blank temperature in forging process, carry out normalizing and ball Annealing is processed, and concrete operation step is:
The forging stage:
Axially jumping-up, pulling repeatedly is carried out to blank;Blank periphery one time, drafts 10~20mm are touched before jumping-up first;
During jumping-up, point 5 slow pressures, each 50~80mm of drafts, upset ratio is 2.3;
When once pulling out, blank temperature is 1080 DEG C, 10~20mm of drafts, and pulling is than being 1.5;
During secondary jumping-up, point 4 slow pressures, each 70~100mm of drafts;
During secondary pulling, blank temperature is 1040 DEG C, 30~50mm of drafts, and pulling is than being 1.5;
During three jumping-ups, point 3 slow pressures, each 70~100mm of drafts;During three pullings, blank temperature is 1000 DEG C, pressure 30~50mm of amount, pulling is than being 2;
Blank is divided into into 2 sections after three pullings, axially jumping-up, pulling repeatedly is carried out respectively to per section;
Blank after segmentation carry out four times it is upset when, points of 3 times slow pressures, each 50~80mm of drafts;
During four pullings, blank temperature is 1050 DEG C, 10~20mm of drafts, and pulling is than being 2;
Five times it is upset when, points of 3 times slow pressures, each 50~70mm of drafts,
During five pullings, blank temperature is 1000 DEG C, 30~50mm of drafts, and pulling is than being 1.5;
Six times it is upset when, points of 2 times slow pressures, each 50~80mm of drafts;
Deformation amount controlling of last fire time between 20~30%, 900 DEG C~950 DEG C of final forging temperature;
Heat treatment stages:
Normalizing is carried out after forging and spheroidizing is processed;After forging, blank charging temperature is 300~350 DEG C, with the speed of 40~60 DEG C/h Degree is raised to 890~910 DEG C, air cooling to 380~400 DEG C after insulation 4h, is incubated 4h, then is raised to 850 with the speed of 50~60 DEG C/h ~870 DEG C, air cooling to 720~740 DEG C after insulation 4h is as cold as 400 DEG C with the speed stove of 10~20 DEG C/h after insulation 6h, then again Air cooling is to room temperature.
2. a kind of Cr12MoV steel forgings make and heat treatment production method, including the heating period, forging the stage, heat treatment stages, plus Hot stage zone heating simultaneously controls programming rate:During shove charge, 300~400 DEG C of in-furnace temperature is incubated 3h after shove charge, then with 40~ The speed of 50 DEG C/h is raised to 860~880 DEG C, is incubated 4h, then is raised to 1100~1130 DEG C with the speed of 70~80 DEG C/h, is incubated 4h, forging of then coming out of the stove, it is characterised in that after controlling drafts, forging by blank temperature in forging process, carry out normalizing and nodularization Make annealing treatment, concrete operation step is:
The forging stage:
Axially jumping-up, pulling repeatedly is carried out to blank;Blank periphery one time, drafts 10~20mm are touched before jumping-up first;
During jumping-up, point 4 slow pressures, each 60~90mm of drafts, upset ratio is 2;
When once pulling out, blank temperature is 1050 DEG C, 10~20mm of drafts, and pulling is than being 1.4;
During secondary jumping-up, point 3 slow pressures, each 80~100mm of drafts;
During secondary pulling, blank temperature is 1000 DEG C, 40~50mm of drafts, and pulling is than being 1.5;
During three jumping-ups, point 3 slow pressures, each 80~100mm of drafts;
During three pullings, blank temperature is 980 DEG C, 30~40mm of drafts, and pulling is than being 1.6;
Blank is segmented after three pullings, carries out axially jumping-up, pulling repeatedly respectively to per section;
Blank after segmentation carry out four times it is upset when, points of 4 times slow pressures, each 60~80mm of drafts;
During four pullings, blank temperature is 1100 DEG C, 10~20mm of drafts, and pulling is than being 1.5;
Five times it is upset when, points of 3 times slow pressures, each 50~70mm of drafts;
Deformation amount controlling of last fire time between 25~30%, 900 DEG C~950 DEG C of final forging temperature;
Heat treatment stages:
Normalizing is carried out after forging and spheroidizing is processed;After forging, blank charging temperature is 300~350 DEG C, with the speed of 40~60 DEG C/h Degree is raised to 890~910 DEG C, air cooling to 380~400 DEG C after insulation 3h, is incubated 3h, then is raised to 850 with the speed of 50~60 DEG C/h ~870 DEG C, air cooling to 720~740 DEG C after insulation 3h is as cold as 400 DEG C with the speed stove of 10~20 DEG C/h after insulation 5h, then again Air cooling is to room temperature.
CN201510115105.6A 2015-03-17 2015-03-17 Production method for forging and thermally treating Cr12MoV steel CN104745780B (en)

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CN105950839A (en) * 2016-06-20 2016-09-21 安徽省瑞杰锻造有限责任公司 Cr12MoV spheroidizing annealing technology
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