CN102418042B - Novel manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel - Google Patents

Novel manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel Download PDF

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CN102418042B
CN102418042B CN2011103625256A CN201110362525A CN102418042B CN 102418042 B CN102418042 B CN 102418042B CN 2011103625256 A CN2011103625256 A CN 2011103625256A CN 201110362525 A CN201110362525 A CN 201110362525A CN 102418042 B CN102418042 B CN 102418042B
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steel
ingot
forging
forges
temperature
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CN102418042A (en
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顾容
刘振天
杨清凯
王琳
汝亚彬
王海江
陈庆新
于丹
赵智刚
牟风
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抚顺特殊钢股份有限公司
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Abstract

The invention discloses a manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel, and the purpose is to solve the problems of quite severe ununiformity of large-section forging material eutectic carbides and the increase of defects of internal cracks and surface cracks during the forging process caused by segregation deterioration of cast structure carbides of large steel ingots. By using steel-making technical measures such as LF refining, VD degassing, aluminium wire feeding, and the like, the invention improves the molten steel cleanliness, the control of electroslag remelting output power, and the homogenization treatment before forging, and improves the segregation of eutectic carbides and the hot-working plasticity of steel; by controlling the forging heating numbers and various deformation amounts of large high-carbon high-chromium steel ingots, large granular carbides are crushed; the ununiformity of eutectic carbides is improved; crack defects during the forging process are prevented; and the produced high-carbon high-chromium steel large-section forging materials has ununiformity of eutectic carbides of up to grade 4-grade 6; the results of ultrasonic inspection are at good levels of E/e grade, D/d grade.

Description

Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the round steel manufacturing process

Technical field

The present invention relates to cold-work die steel and forge the round steel manufacture method, be specifically related to a kind of Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel and forge the round steel manufacturing process.

Background technology

The Alloy-steel mold steel can be divided into cold-work die steel, hot-work die steel and plastic die steel, and wherein cold-work die steel is mainly for the manufacture of at ambient temperature with the various moulds of metallic substance compression moulding; The kind of cold-work die is a lot, applied range, and its output value accounts for 1/3 left and right of the mould gross output value.According to the working conditions of mould and the batch of production product, cold-work die steel can be divided into by performance: high carbon and chromium Cr12Mo1V1, the Cr6WV etc. that carbon tool steel T8~T12 that hardening capacity is low etc., 9SiCr, the CrWMn etc. that hardening capacity is higher, the 6CrW2Si of high tenacity etc., high-hardenability high-wearing feature and quenching strain are little and the cold work die steel in high alloy through of powder metallurgy etc.

The high carbon and chromium cold-work die steel belongs to Ledeburitic steel, owing to containing the carbide forming elements such as a large amount of Cr, Mo, V in steel, solidify with During Eutectoid Decomposition in can form a large amount of eutectic carbidess, cause the thermoplasticity of steel poor, surface crack easily appears in forging the course of processing.Simultaneously, although can broken herring-bone form eutectic carbides through the forging deformation operation, be forged aspect effect, the distribution of carbides in heavy in section steel remains inhomogeneous; The inhomogeneous mechanical property that reduces steel when serious of the large particle carbide that exists in steel or distribution of carbides, and cause mould to occur the quality problems such as distortion, cracking in heat treatment process, and with the increase of forging material size, the irregularity of eutectic carbides is more serious.Therefore the irregularity of eutectic carbides is the important technology index of weighing high carbon and chromium cold-work die steel Quality level of actual product.

At present, the high carbon and chromium type cold-work die forging material size on the domestic and international market has increased to Φ 300mm~Φ 700mm, increases with forging the material dimensions, can only adopt more large-scale steel ingot and large forging and pressing processing ratio.And the as-cast structure carbide segregation of large-scale steel ingot is even more serious, as shown in Figure 1, greatly increases than the probability that produces implosion and surface crack defect in forging process in large forging and pressing processing.

Adopting special control method to reduce the segregation degree of carbide in the ingot casting process, and further reduce ununiformity and the flaw detection quality of carbide by hot-work, is the problem that present Special Steel Both At Home And Abroad material production needs to be resolved hurrily.

Domestic high carbon and chromium type cold-work die forging material overall dimension specification on domestic market is only Φ 250mm, delivers goods according to the GB/T1299-2000 standard of alloy tool steels.The standard code diameter is greater than the steel of 120mm, the qualified rank of the irregularity of eutectic carbides generally is not more than 6 grades (or both sides of supply and demand agreements), and the quality level of steel can't satisfy for making large section, heavy loading, the complex-shaped large-scale cold-work die demand that can stand large impact power.

Adopt at present up and down flat anvil method to forge both at home and abroad in high carbon and chromium type cold-work die steel Large-scale Forging material is produced, the method is symmetric deformation, is convenient to control depress.Affected by material thermoplasticity, the pass deformation of high carbon and chromium type cold-work die steel easily produces tensile stress generally 3%~10%, after tensile stress surpasses material critical intensity, partly produces cracking along the large particle carbide wedge angle.

Summary of the invention

The objective of the invention is to disclose a kind of Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel and forge the round steel manufacturing process, worsen, cause the large section to forge the problem that implosion in the very serious and forging process of material the irregularity of eutectic carbides and surface crack defect increase with the as-cast structure carbide segregation that solves large-scale steel ingot.

For achieving the above object, the present invention takes following technical scheme:

⑴ the chemistry of steel becomes to control: C:1.4%~1.8%, Mn:0.40%~0.80%, S i:0.40%~0.80%, S :≤0.010%, P :≤0.030%, Cr:11.0%~13.0%, Mo:1.0%~1.5%, V:1.0%~1.5%, oxygen level≤20 * 10 -6, all the other are Fe; The part trade mark contains or W:0.6%~1.0%.

⑵ steel adopts EAF+LF+VD or EAF+LF+VD+ESR method to smelt, refining steel steel ingot: 4t~9t; Electroslag ingot: Φ 930mm~Φ 1100mm.

1. when adopting EAF+LF+VD explained hereafter 4t~9t steel ingot or Φ 700mm electrode bar, LF stove refining white slag method is fed aluminum steel after the VD stove is degassed, control Oxygen Content in Liquid Steel and be not more than 20 * 10 -6

2. in Φ 930mm and the large-scale ESR ingot smelting of Φ 1100mm, electrode base remelting power input is controlled at respectively 1350KW~1450KW and 1750KW~1850KW; The packing stage power input reduces gradually with the speed that is not more than 100kW/h.

⑶ large-scale steel ingot carries out High temperature diffusion before forging, diffusion temperature is 1170 ℃~1200 ℃, and press 4h~10h according to ingot shape and control diffusion time;

⑷ adopt many fire to forge, and is divided into three steps:

The first step, symmetric deformation forges: steel ingot is by 1140 ℃~1160 ℃ heating, and the soaking time of reburning is controlled by 1.5h-3.0h; Adopt the wide flat anvil in up and down that steel ingot is gently pressed, every time deflection of this operation is controlled by 3%~6%; Final forging temperature is not less than 850 ℃.

Second step, assymmetrical deformation forges: steel billet is by 1120 ℃~1140 ℃ heating, and the soaking time of reburning is controlled by 1.5h-3.0h; Adopt upper wide flat anvil, lower platform to forge to middle steel billet, every time deflection of this operation is controlled by 15%~30%; Final forging temperature is not less than 850 ℃.

In the 3rd step, finished product forges: adopt the finishing of circular hole swage block to be shaped forging stock, every time deflection of this operation is 5%~15%; Final forging temperature is not less than 850 ℃.

⑸ finished product material is forged the rear red annealing of sending, and temperature is 850 ℃~900 ℃.

The present invention by adopt LF refining, VD degassed, feed the process for making measure such as aluminum steel and improved Cleanliness of Molten Steel, the processing that homogenizes to the control of esr output rating and before forging improves the hot-workability of eutectic carbides segregation and steel; And control by forging times and different distortion amount to large-scale high carbon and chromium steel ingot, crushing large particle carbide and improve the irregularity of eutectic carbides, prevent crack defect in forging process, the high-carbon high-chromium steel large section of production is forged the material the irregularity of eutectic carbides and is assessed as 4 grades~6 grades by the 4th grading figure in GB/T 14979 standards; Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies E/e level, D/d level good level.

The present invention improves the irregularity of eutectic carbides by above-mentioned process program, and the main technique measure is as follows:

1. optimization of Chemical Composition design

C in the high carbon and chromium cold-work die steel, Cr, Mo, V are carbides, contain 16%~18% carbide in the annealed state steel.On the basis that guarantees material property, by adjusting, control the content of above-mentioned element, can effectively control the content of carbide.As-cast structure after chemical composition is adjusted as shown in Figure 2, compared to Figure 1, the remarkable refinement of the carbide in the as-cast structure of steel.

2. the control of LF stove, the refining of VD stove and electroslag remelting process parameter

By the control to [FeO] content in the sub-basicity of LF slag and slag, reach the deoxidation effect of expection.

In esr process, the control of voltage and current can stable metal electrode melting speed, reduces microstructure segregation.

The control of the treatment process parameter that 3. homogenizes

Heating Steel Ingots to a little less than insulation for a long time at the temperature of solidus curve, can be eliminated dendritic segregation and regional segregation that ingot casting produces in process of setting, make composition and microstructure homogenization.By the cross matching to high carbon and chromium cold-work die steel as-cast structure High temperature diffusion temperature and time, determine that 1170 ℃~1200 ℃ are rational diffusion temperature, press 4h~10h diffusion time and control.

4. the control of open die forging processing parameter

In the pulling operation, by the adjustment of forging tools, realize the reasonable use of symmetric deformation and assymmetrical deformation technique; Guarantee the broken of as-cast structure and avoid tensile stress to cause to forge the material implosion, final pass is by controlling deflection to guarantee surface quality.

Compared with prior art, the present invention has following advantages:

Adopt the LF+VD refinery practice to control Cleanliness of Molten Steel, oxygen level is not more than 20 * 10 -6

Control large-scale ESR ingot remelt speed and filling velocity, reduce composition and carbide segregation;

Process by homogenizing and improve eutectic carbides segregation, raising as-cast structure thermoplasticity;

In employing, wide flat anvil, lower platform method aximal deformation value forge, and material internal defect defective is forged in compacting.

Description of drawings

Describe the present invention below in conjunction with the drawings and specific embodiments.

Fig. 1 is 1.2379 steel as-cast structure metallographs;

Fig. 2 is 1.2379 steel as-cast structure metallographs after chemical composition adjustment, control;

Fig. 3 is Φ 300mm electric furnace forging material the irregularity of eutectic carbides metallographic structure photo;

Fig. 4 is Φ 480mm electric furnace forging material the irregularity of eutectic carbides metallographic structure photo;

Fig. 5 is Φ 510mm electroslag forging material carbide metallographic structure photo;

Fig. 6 is Φ 700mm electroslag forging material carbide metallographic structure photo.

Embodiment

Implement according to technique scheme, following four preferred embodiments are provided.

Embodiment 1

The production form factor is Φ 300mm round steel.

Adopt the EAF+LF+VD method to smelt, the LF stove adopts 4.25 high basicity slags, and in bits, [FeO] content is 0.61%, and the white slag time is 35min; VD vacuum tightness≤1mbar keeps 15min, soft blow Ar gas 10min before cast, and cast 5t ingot shape, teeming temperature is 1471 ℃, the 5t ingot is red send lower step subsidiary factory.

The heat analysis of steel ingot chemical composition the results are shown in Table 1.

Table 1 chemical composition

Steel ingot is processed through high temperature homogenization, 1178 ℃ of Heating temperatures, soaking time 4h.

Steel ingot adopts eight fire to forge, and being divided into is three steps: the first step symmetric deformation forges, and first three fire adopts the wide flat anvil in up and down that steel ingot is gently pressed, and pass deformation is 3.83%~4.9%, and final forging temperature is 855 ℃~860 ℃; The second step assymmetrical deformation forges, and the 4th fire to the seven fire adopt upper wide flat anvil, lower platform to forge, and pass deformation is 22.01%~29.79%, and final forging temperature is 854 ℃~865 ℃; The 3rd step finished product forges, and forging stock is adopted circular hole swage block finishing moulding, and pass deformation is 12.67%, and final forging temperature is 855 ℃.The finished product material is forged the rear red annealing of sending, and annealing temperature is 882 ℃.

Table 2 deflection statistics

Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies the E/e rank, and as shown in Figure 3, the irregularity of eutectic carbides is assessed as 4 grades by the 4th grading figure in GB/T 14979 standards.

Embodiment 2

The production form factor is Φ 480mm round steel.

Adopt the EAF+LF+VD method to smelt, the LF stove adopts 4.21 high basicity slags, and in bits, [FeO] content is about 0.63%, and the white slag time is 33min; VD vacuum tightness≤1mbar keeps 15min, soft blow Ar gas 10min before cast, and cast 9t ingot shape, teeming temperature is 1468 ℃, the 9t ingot is red send lower step subsidiary factory.

The heat analysis of steel ingot chemical composition the results are shown in Table 3.

Table 3 chemical composition

Steel ingot is processed through high temperature homogenization, 1177 ℃ of Heating temperatures, soaking time 6h.

Steel ingot adopts nine fire to forge, and being divided into is three steps: the first step symmetric deformation forges, and front four fire adopt the wide flat anvil in up and down that steel ingot is gently pressed, and pass deformation is 3.71%~5.28%, and final forging temperature is 853 ℃~861 ℃; The second step assymmetrical deformation forges, and the 4th fire to the eight fire adopt upper wide flat anvil, lower platform to forge, and pass deformation is 16.96%~21.86%, and final forging temperature is 851~862 ℃; The 3rd step finished product forges, and forging stock is adopted circular hole swage block finishing moulding, and pass deformation is 9.05%, and final forging temperature is 852.The finished product material is forged the rear red annealing of sending, and annealing temperature is 885.

Table 4 deflection statistics

Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies the D/d rank, and as shown in Figure 4, the irregularity of eutectic carbides is assessed as 6 grades by the 4th grading figure in GB/T 14979 standards.

Embodiment 3

The production form factor is Φ 510mm round steel.

Adopt the EAF+LF+VD method to smelt, the LF stove adopts 4.23 high basicity slags, and in bits, [FeO] content is about 0.62%, and the white slag time is 32min; VD vacuum tightness≤1mbar keeps 15min, soft blow Ar gas 10min before cast, and cast Φ 700mm circle electrode bar, teeming temperature is 1469 ℃, electrode bar is red send annealing, is annealed into 890 ℃.Adopt ternary slag system CaF during esr 2: Al 2O 3: MgO=65%:30%:5%, its remelting quantity of slag is 370kg, and the remelting voltage control is at 75V~82V, and melting current is controlled at 16000A~20000A, and the esr ingot shape is Φ 930mm ESR ingot, the ESR ingot temperature is sent lower step subsidiary factory.The electrode bar chemical composition analysis the results are shown in Table 5.

Table 5 chemical composition

Φ 930mm ESR ingot is processed through high temperature homogenization, 1182 ℃ of Heating temperatures, soaking time 8h.Steel ingot adopts seven fire to forge, and being divided into is three steps: the first step symmetric deformation forges, and first three fire adopts the wide flat anvil in up and down that steel ingot is gently pressed, and pass deformation is 4.36%~5.82%, and final forging temperature is 856 ℃~862 ℃; The second step assymmetrical deformation forges, and the 4th fire to the six fire adopt upper wide flat anvil, lower platform to forge, and pass deformation is 16.56%~20.76%, and final forging temperature is 861 ℃~869 ℃; The 3rd step finished product forges, and forging stock is adopted circular hole swage block finishing moulding, and pass deformation is 7.48%, and final forging temperature is 857 ℃.The finished product material is forged the rear red annealing of sending, and annealing temperature is 883 ℃.

Table 6 deflection statistics

Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies the E/e rank, and as shown in Figure 5, the irregularity of eutectic carbides is assessed as 5 grades by the 4th grading figure in GB/T 14979 standards.

Embodiment 4

The production form factor is Φ 700mm round steel.

Adopt the EAF+LF+VD method to smelt, the LF stove adopts 4.20 high basicity slags, and in bits, [FeO] content is about 0.64%, and the white slag time is 35min; VD vacuum tightness≤1mbar keeps 15min, soft blow Ar gas 10min before cast, and cast Φ 700mm circle electrode bar, teeming temperature is 1474 ℃, electrode bar is red send annealing, is annealed into 890 ℃.Adopt ternary slag system CaF during esr 2: Al 2O 3: MgO=65%:30%:5%, its remelting quantity of slag is 630kg, and the remelting voltage control is at 80V~100V, and melting current is controlled at 18000A~22000A, and the esr ingot shape is Φ 1100mm ESR ingot, the ESR ingot temperature is sent lower step subsidiary factory.

The Electro Slag Remelting Steel chemical composition analysis the results are shown in Table 7.

Table 7 chemical composition

Φ 1100mm ESR ingot is processed through high temperature homogenization, 1183 ℃ of Heating temperatures, soaking time 10h.Steel ingot adopts six fire to forge, and being divided into is three steps: the first step symmetric deformation forges, and first three fire adopts the wide flat anvil in up and down that steel ingot is gently pressed, and pass deformation is 3.65%~4.95%, and final forging temperature is 854 ℃~859 ℃; The second step assymmetrical deformation forges, and the 4th fire to the five fire adopt upper wide flat anvil, lower platform to forge, and pass deformation is 15.82%~16.95%, and final forging temperature is 858 ℃~865 ℃; The 3rd step finished product forges, and forging stock is adopted circular hole swage block finishing moulding, and pass deformation is 6.29%, and final forging temperature is 855 ℃.The finished product material is forged the rear red annealing of sending, and annealing temperature is 881 ℃.

Table 8 deflection statistics

Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies the D/d rank, as shown in Figure 6, is assessed as 6 grades as the figure the irregularity of eutectic carbides by the 4th grading figure in GB/T 14979 standards.

Subordinate list:

Table 1 the present invention forges the material chemical component table

The specification of table 2 various embodiments of the present invention, chemical component table

The fabrication process parameters table of table 3 various embodiments of the present invention

The physicochemical property assay data sheet of table 4 various embodiments of the present invention

Table 1 the present invention forges the material chemical component table

The specification of table 2 various embodiments of the present invention, chemical component table

The fabrication process parameters table of table 3 various embodiments of the present invention

The physicochemical property assay data sheet of table 4 various embodiments of the present invention

Claims (8)

1. Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the round steel manufacturing process, and it is characterized in that: described technique is as follows:
⑴ the chemical Composition Control of steel exists: C:1.4%~1.8%, Mn:0.30%~0.80%, Si:0.30%~0.80%, S :≤0.010%, P :≤0.030%, Cr:11.0%~13.0%, Mo:0.8%~1.4%, V:0.8%~1.4%, oxygen level≤20 * 10 -6, all the other are Fe;
⑵ steel adopts EAF+LF+VD or EAF+LF+VD+ESR method to smelt, refining steel steel ingot: 4t~9t; Electroslag ingot: Φ 930mm~Φ 1100mm;
1. when adopting EAF+LF+VD explained hereafter 4t~9t refining steel steel ingot or Φ 700mm electrode bar, LF stove refining white slag method is fed aluminum steel after the VD stove is degassed, control Oxygen Content in Liquid Steel and be not more than 20 * 10 -6
2. in Φ 930mm and the smelting of Φ 1100mm electroslag ingot, electrode bar remelting power input is controlled at respectively 1350kW~1450kW and 1750kW~1850kW; The packing stage power input reduces gradually with the speed that is not more than 100kW/h;
⑶ steel ingot carries out high temperature homogenization before forging processes, and Heating temperature is 1170 ℃~1200 ℃, and soaking time is pressed 4h~10h according to ingot shape and controlled;
⑷ adopt many fire to forge, and is divided into three steps:
The first step, symmetric deformation forges: steel ingot is by 1140 ℃~1160 ℃ heating, and the soaking time of reburning is controlled by 1.5h-3.0h; Adopt the wide flat anvil in up and down that steel ingot is gently pressed, every time deflection of this operation is controlled by 3%~6%; Final forging temperature is not less than 850 ℃;
Second step, assymmetrical deformation forges: steel billet is by 1120 ℃~1140 ℃ heating, and the soaking time of reburning is controlled by 1.5h-3.0h; Adopt upper wide flat anvil, lower platform to forge to middle steel billet, every time deflection of this operation is controlled by 15%~30%; Final forging temperature is not less than 850 ℃;
In the 3rd step, finished product forges: adopt the finishing of circular hole swage block to be shaped forging stock, every time deflection of this operation is 5%~15%; Final forging temperature is not less than 850 ℃;
⑸ finished product material is forged the rear red annealing of sending, and temperature is 850 ℃~900 ℃.
2. Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the forging round steel of round steel fabrication process according to claim 1, and it is characterized in that: the forging round steel the irregularity of eutectic carbides of described production is assessed as 4 grades~6 grades by the 4th grading figure in GB/T 14979 standards; Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies E/e level, D/d level.
3. Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the round steel manufacturing process according to claim 1, and it is characterized in that: described technique is as follows:
The production form factor is Φ 300mm round steel;
⑴ the chemical composition of steel (%) heat analysis: C:1.51, Mn:0.37, Si:0.42, S:0.008, P :≤0.021, Cr:11.92, Mo:0.89, V:0.83, oxygen level: 16 * 10 -6, all the other are Fe;
⑵ adopt the EAF+LF+VD method to smelt, and the LF stove adopts 4.25 high basicity slags, and in bits, [FeO] content is 0.61%, and the white slag time is 35min; VD vacuum tightness≤1mbar keeps 15min, soft blow Ar gas 10min before cast, and cast 5t ingot shape, teeming temperature is 1471 ℃, the 5t ingot is red send lower step subsidiary factory;
⑶ steel ingot is processed through high temperature homogenization, 1178 ℃ of Heating temperatures, soaking time 4h;
⑷ steel ingot adopts eight fire to forge, and being divided into is three steps:
The first step, symmetric deformation forges, and first three fire adopts the wide flat anvil in up and down that steel ingot is gently pressed, and pass deformation is 3.83%~4.9%, and final forging temperature is 855 ℃~860 ℃;
Second step, assymmetrical deformation forges, and the 4th fire to the seven fire adopt upper wide flat anvil, lower platform to forge, and pass deformation is 22.01%~29.79%, and final forging temperature is 854 ℃~865 ℃;
In the 3rd step, finished product forges: forging stock is adopted circular hole swage block finishing moulding, and pass deformation is 12.67%, and final forging temperature is 855 ℃;
⑸ finished product material is forged the rear red annealing of sending, and annealing temperature is 882 ℃.
4. Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the forging round steel of round steel fabrication process according to claim 3, and it is characterized in that: the forging round steel the irregularity of eutectic carbides of described production is assessed as 4 grades by the 4th grading figure in GB/T 14979 standards; Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies the E/e level.
5. Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the round steel manufacturing process according to claim 1, and it is characterized in that: described technique is as follows:
The production form factor is Φ 480mm round steel;
⑴ the chemical composition of steel (%) heat analysis: C:1.53, Mn:0.38, Si:0.40, S:0.005, P:0.022, Cr:12.01, Mo:0.91, V:0.84, oxygen level: 15 * 10 -6, all the other are Fe;
⑵ adopt the EAF+LF+VD method to smelt, and the LF stove adopts 4.21 high basicity slags, and in bits, [FeO] content is 0.63%, and the white slag time is 33min; VD vacuum tightness≤1mbar keeps 15min, soft blow Ar gas 10min before cast, and cast 9t ingot shape, teeming temperature is 1468 ℃, the 9t ingot is red send lower step subsidiary factory;
⑶ steel ingot is processed through high temperature homogenization, 1177 ℃ of Heating temperatures, soaking time 6h;
⑷ steel ingot adopts nine fire to forge, and being divided into is three steps:
The first step, symmetric deformation forges: front four fire adopt the wide flat anvil in up and down that steel ingot is gently pressed, and pass deformation is 3.71%~5.28%, and final forging temperature is 853 ℃~861 ℃;
Second step, assymmetrical deformation forges: the 5th fire to the eight fire adopt upper wide flat anvil, lower platform to forge, and pass deformation is 16.96%~21.86%, and final forging temperature is 851 ℃~862 ℃;
In the 3rd step, finished product forges: forging stock is adopted circular hole swage block finishing moulding, and pass deformation is 9.05%, and final forging temperature is 852 ℃;
⑸ finished product material is forged the rear red annealing of sending, and annealing temperature is 885 ℃.
6. Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the forging round steel of round steel fabrication process according to claim 5, and it is characterized in that: the forging round steel the irregularity of eutectic carbides of described production is assessed as 6 grades by the 4th grading figure in GB/T 14979 standards; Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies the D/d level.
7. Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the round steel manufacturing process according to claim 1, and it is characterized in that: described technique is as follows:
The production form factor is Φ 510mm round steel;
⑴ the electrode bar chemical composition (%) of steel is analyzed: C:1.56, Mn:0.37, Si:0.39, S:0.005, P :≤0.022, Cr:11.92, Mo:0.90, V:0.89, oxygen level: 19 * 10 -6, all the other are Fe;
⑵ adopt the EAF+LF+VD method to smelt, and the LF stove adopts 4.23 high basicity slags, and in bits, [FeO] content is 0.62%, and the white slag time is 32min; VD vacuum tightness≤1mbar keeps 15min, soft blow Ar gas 10min before cast, and cast Φ 700mm circle electrode bar, teeming temperature is 1469 ℃, electrode bar is red send annealing, is annealed into 890 ℃; Adopt ternary slag system CaF during esr 2: Al 2O 3: MgO=65%:30%:5%, its remelting quantity of slag is 370kg, and the remelting voltage control is at 75V~82V, and melting current is controlled at 16000A~20000A, and the esr ingot shape is Φ 930mm electroslag ingot, the electroslag ingot temperature is sent lower step subsidiary factory;
⑶ Φ 930mm ESR ingot is processed through high temperature homogenization, 1182 ℃ of Heating temperatures, soaking time 8h;
⑷ steel ingot adopts seven fire to forge, and being divided into is three steps:
The first step, symmetric deformation forges: first three fire adopts the wide flat anvil in up and down that steel ingot is gently pressed, and pass deformation is 4.36%~5.82%, and final forging temperature is 856 ℃~862 ℃;
Second step, assymmetrical deformation forges: the 4th fire to the six fire adopt upper wide flat anvil, lower platform to forge, and pass deformation is 16.56%~20.76%, and final forging temperature is 861 ℃~869 ℃;
In the 3rd step, finished product forges: forging stock is adopted circular hole swage block finishing moulding, and pass deformation is 7.48%, and final forging temperature is 857 ℃;
⑸ finished product material is forged the rear red annealing of sending, and annealing temperature is 883 ℃.
8. Φ 300mm~Φ 700mm high carbon and chromium cold-work die steel forges the forging round steel of round steel fabrication process according to claim 7, and it is characterized in that: the forging round steel the irregularity of eutectic carbides of described production is assessed as 5 grades by the 4th grading figure in GB/T 14979 standards; Finished product material after annealing is come out of the stove is by 3 groups of UT (Ultrasonic Testing) in SEP1921, and quality grade satisfies the E/e level.
CN2011103625256A 2011-11-16 2011-11-16 Novel manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel CN102418042B (en)

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