High-broadening-rate drawing-out forging method for difficult-to-deform high-silicon alloy electroslag round ingot

Abstract

The invention discloses a high-broadening-rate drawing-out forging method for a difficult-to-deform high-silicon alloy electroslag round ingot. Direct forging and drawing-out forging with few forging heating numbers are achieved. A conventional free forging device, a flat anvil, a common forging tool and a small round ingot are adopted, under the condition of six forging heating numbers, deformation of each heating number and the heating temperature range are optimally matched, large rolling reduction and vertical face light pressing are controlled in a staged mode to be combined to promote broadening, straightness, chamfer forging angles, step length and the shape of an intermediate blank are controlled, and forging precision is improved. Deformation of the blank is gradually transferred from the surface layer to the core part, and the forging structure is improved through the high deformation rate; sufficient metal flowing is ensured, so that the blank obtains larger deformation in the width direction, and stable deformation with high broadening rate is realized; and the surface quality and thermoplasticity are improved by adopting a rolling mode in the key heating number. And the wide forging stock with good surface quality is obtained only in a drawing-out forging mode, and the broadening rate is remarkably increased by 10% or above.

Description

Technical Field

[0001] This invention belongs to the field of metal material forging technology, specifically relating to a high-width elongation forging method for high-silicon alloy electroslag round ingots that are difficult to deform. Background Technology

[0002] A high-silicon alloy, domestically equivalent to 022Cr14Ni16Si6MoCu, exhibits excellent corrosion resistance in strongly acidic media. It is widely used in core components of sulfuric acid and nitric acid production equipment, such as dry absorption towers, absorption tower linings, and acid separators, replacing traditional ceramic tile structures. This reduces weight by approximately 30% and lowers leakage rates by about 90%, offering high safety and economy. The market application prospects are promising, with a significant increase in demand for wide steel plates and increasingly stringent metallurgical quality requirements. To meet market demands for this high-silicon alloy wide steel plate (typically 1500 mm wide and 6000 mm long) and high metallurgical purity, the current production process primarily employs electroslag remelting of round ingots + round ingot forging and billet rolling. This requires forging billets to have a width of at least 1200 mm and good surface quality to match the rolling equipment for wide steel plate production. However, the alloy contains up to 6% silicon. Due to its low melting point and low specific gravity, silicon will cause severe dendrite segregation during the solidification of molten steel, which will promote the precipitation of brittle intermetallic phases such as σ phase at the grain boundaries. Furthermore, the melting point of the silicon-rich region is even lower (around 1220℃). At the same time, its alloy ratio is as high as 40% and it contains copper, which leads to poor thermoplasticity, high deformation resistance, and problems such as narrow hot working window and difficulty in deformation. Wide-width forging billets must be forged using small reduction, short step length, and multiple forging cycles, which significantly increases the difficulty of forging production and surface quality control. Current forging methods mainly include upsetting small ingots and direct drawing of large ingots. To reduce ingot segregation, upsetting with small ingots, using convex anvils, wedge anvils, or specialized widening dies, is preferred. However, during upsetting, the outer surface of the ingot is subjected to intense tensile stress. Given the poor thermoplasticity of this alloy, severe surface cracking is highly likely, making further forging impossible. This also results in more forging passes, a higher tendency to crack, and low production efficiency. While direct drawing of large ingots can achieve widths exceeding 1200mm, the severe segregation in large ingots necessitates longer homogenization processes and similar issues of multiple forging passes, cracking, and low production efficiency. Therefore, there is an urgent need to develop a high-width-ratio drawing forging method for difficult-to-deform high-silicon alloy electroslag remelting round ingots. Summary of the Invention

[0003] This invention discloses a high-width elongation forging method for high-silicon alloy electroslag round ingots that are difficult to deform. Under ordinary forging tooling conditions, a flat anvil and a small steel ingot of suitable size are used for direct elongation forging. Only a few forging passes are required to obtain a forging billet with ideal width and good surface quality.

[0004] The specific technical solution is as follows: Based on the desired billet width and the actual available steel ingot size, a suitable small ingot shape is selected for forging. In this case, the required billet width is at least 1200mm, and a suitable small ingot shape is a Φ1100mm electroslag round ingot. The steel ingot needs to undergo homogenization treatment before forging, and is then removed from the furnace for forging. The forging and drawing process includes six passes, and the main operations and parameter ranges for each pass are as follows: First forging: Forging reduction is 20mm-40mm, step size is 200mm-300mm, rolling method is used to flatten the steel ingot surface, remove slag grooves and pits, and control the forging size to 1050mm-1070mm; the final forging temperature is not lower than 950℃, and the intermediate billet is immediately reheated after forging. Heating process: holding temperature is 1150℃-1200℃, and holding for 2-3 hours after thorough heating to restore thermoplasticity; the macroscopic morphology after forging is as follows. Figure 2 As shown; Second forging: The reduction is 40mm-50mm, the step size is 200mm-300mm, 2-3 passes for flat forging → 2-3 passes for flipping and forging → 2 passes for each 45° chamfer; the forging dimensions are 780mm-820mm thickness and 1060mm-1100mm width; the final forging temperature is not lower than 950℃, and the intermediate billet is immediately reheated after forging, using the same heating process as the first forging; the macroscopic morphology after forging is as follows. Figure 3 As shown; Third forging: The reduction is 50mm-70mm, the step size is 200mm-300mm, 1-2 passes for flat forging → 1-2 passes for flipping forging → 2 passes for each 30° chamfering step → clamping. Due to the increased width-to-thickness ratio of the intermediate billet, the chamfering angle is reduced to avoid forging offset torque damaging the equipment and affecting the forging effect. At this point, the size of the intermediate billet is suitable for clamping operation, which facilitates subsequent forging operations. The forged dimensions are 570mm-610mm thickness and 1120mm-1150mm width. The final forging temperature is not lower than 950℃. The intermediate billet reheating process is the same as the previous forging. The macroscopic morphology after forging is as follows: Figure 4 As shown.

[0005] Fourth forging: Planar reduction is 60mm-70mm, vertical reduction is 20mm-30mm, step length is 150mm-200mm; 1-2 passes for planar forging → 1-2 passes for flipping → 1 pass for vertical forging; Post-forging dimensions are 390mm-430mm thickness and 1180mm-1200mm width. At this stage, the width-to-thickness ratio of the intermediate billet is too large, and the chamfering forging method is no longer applicable; the final forging temperature is the same as the previous forging, and the intermediate billet reheating process is the same as the previous forging; the macroscopic morphology after forging is as follows. Figure 5 As shown.

[0006] Fifth forging: Planar reduction is 50mm-60mm, vertical reduction is 15mm-25mm, step length is 150mm-200mm; 1-2 passes for planar pressing → 1-2 passes for flipping pressing → 1 pass for vertical pressing, with light vertical pressing to achieve flatness and straighten lateral bends; post-forging dimensions are thickness 270mm-300mm and width 1220mm-1240mm; final forging temperature and reheating process are the same as previous forgings; post-forging macroscopic morphology is as follows. Figure 6 As shown.

[0007] Sixth forging: Planar reduction is 50mm-60mm, vertical reduction is 10mm-20mm, and step length is 100mm-150mm; 1-2 passes of planar pressing → 1-2 passes of flipping pressing → 1 pass of vertical pressing → shaping; final forging temperature not lower than 950℃, shaping temperature not lower than 900℃, to obtain a forged billet with good shape and surface quality; post-forging dimensions are 180mm-210mm thickness and 1230mm-1260mm width; post-forging macroscopic morphology as shown... Figure 7 As shown.

[0008] Invention point description: Using conventional free forging equipment and ordinary forging fixtures with a flat anvil, and with relatively small round ingots, under the conditions of six forging passes and forging deformation amounts that difficult-to-deform alloys can withstand, the heating process of the ingot and intermediate billet was optimized by controlling the forging sequence, deformation amount, step length, and intermediate billet shape and size in each pass. Measures such as staged control of reduction, step length, chamfering forging angle, reduction of forging contact area, and light pressure on the vertical surface were employed to assist in widening and promote lateral flow of metal to achieve a high widening ratio. Deformation was gradually transferred from the surface to the core, significantly improving the as-cast microstructure and achieving stable deformation with a high widening ratio. In the critical passes, rolling was used to improve surface quality and thermoplasticity, chamfering forging assisted widening, and the intermediate billet shape was controlled to promote widening. Using smaller ingots, elongation forging, and fewer forging passes, wide forged billets with good surface quality were obtained.

[0009] The first forging is mainly used to smooth out slag grooves and pits on the surface of steel ingots. It uses appropriate reduction and step size for forging to break the surface cast structure, improve thermoplasticity, and make the head and tail dimensions of the steel ingot consistent. This lays the foundation for subsequent forging operations and obtaining good surface quality and shape. The final forging temperature should be reasonably controlled to avoid the problem of forging cracks caused by poor thermoplasticity due to excessively low temperature. The second forging process aims to deform the circular intermediate billet primarily in the upper and lower directions. It employs appropriate forging reduction and step size, along with matching chamfering at a suitable angle. This process helps to increase the width of the billet and reduces the width of the upper and lower planes, resulting in a cross-sectional shape that is narrow at the top and bottom and wide in the middle. This reduces the contact area between the upper and lower surfaces and the flat anvil during subsequent forging, thereby achieving a similar widening effect to convex anvil forging while reducing the lateral flow resistance of the metal and significantly improving the widening effect. Third forging: Using the intermediate billet shape obtained from the second forging, appropriate reduction and step size forging are adopted. By increasing the forging deformation in both the upper and lower directions, the width is promoted. Chamfering is then carried out at an appropriate angle to further increase the width, resulting in an intermediate billet shape similar to that of the second forging, which provides favorable conditions for subsequent high width elongation forging. Fourth step: In the upper and lower planes, a large drawing and pressing amount and a suitable step length are used to promote the forging and expansion deformation, and to shape the vertical surface forging to achieve the purpose of regular shape; Fifth step: Use a larger drawing and pressing amount and a smaller step size for rapid forging to avoid forging difficulties and surface cracking caused by the thinner intermediate billet cooling down quickly. The sixth step mainly involves using a larger drawing and reduction amount, small step size, and rapid forging to the target size. This avoids forging difficulties caused by thin billet size and relatively large deformation. Under the condition of ensuring the final forging temperature, it obtains the required size, shape, and good surface quality of the forging billet, and uses a larger reduction amount to refine the forging structure.

[0010] Compared with traditional processes, this invention has the following advantages: no additional tooling is required; a width ratio of more than 10% higher than that of ordinary forging can be obtained simply by flat anvil drawing forging; the equipment is highly versatile; the forging process is reduced from 10 forging passes to 6 forging passes, reducing energy consumption, increasing efficiency, and effectively reducing production costs; the process is simple and highly operable; the surface quality is good, the forging billet has a regular geometric shape, and the internal structure is uniform and dense; it is suitable for wide-width forging of high-silicon alloys and other difficult-to-deform steels with high deformation resistance, poor thermoplasticity, and easy cracking. Attached Figure Description

[0011] Figure 1 A schematic diagram of the process for high-width elongation forging of difficult-to-deform high-silicon alloy electroslag round ingots provided in an embodiment of the present invention; Figures 2 to 7 All images are macroscopic morphological images after each forging process. Figures 8 to 10 The images shown are macroscopic morphological images of Comparative Examples 1, 2, and 3 after forging. Detailed Implementation

[0012] The present invention will be described in detail with reference to the accompanying drawings and embodiments.

[0013] The process of high-width elongation forging of difficult-to-deform high-silicon alloy electroslag round ingots is as follows: Figure 1 As shown. Using Φ1100 mm electroslag round ingots as raw material, after homogenization treatment, the ingots are forged in a furnace. The forging process is completed in six passes. For ease of description and clarity, the formula for calculating the "average width spread" mentioned in the text is as follows: Average width spread = (width of the final forged billet - maximum dimension at the start of elongation forging) / (maximum dimension at the start of elongation forging - thickness of the final forged billet). The chamfer angle mentioned in the text refers to the angle of rotation of the trolley to the left or right when the large surface of the intermediate billet is perpendicular to the anvil and aligned. Example

[0014] First forging: 40mm reduction, 300mm step size, surface rolling, forging dimension 1060mm, final forging temperature 990℃, immediately reheated to 1170℃ and held for 2.5h; macroscopic morphology after forging as shown. Figure 2 As shown.

[0015] Second forging: 50mm reduction, 300mm step; 3 passes for flat forging → 2 passes for flipping and forging → 2 passes for each of the 45° chamfering passes → vertical shaping; final thickness 810 mm, width 1080 mm; final forging temperature 965℃; reheat to 1180℃ in the furnace, hold for 3 hours; final macroscopic morphology as shown. Figure 3 As shown.

[0016] Third pass: 55mm reduction, 250mm step length; 2 passes for flat pressing → 2 passes for flipping pressing → 2 passes for each 30° chamfering → vertical shaping; final thickness 590mm, width 1140mm; final forging temperature 950℃, after pressing, return to furnace and heat to 1180℃, hold for 3 hours; final macroscopic morphology as follows: Figure 4 As shown.

[0017] Fourth forging: 60 mm reduction on the flat surface, 20 mm reduction on the vertical surface, step length 200 mm; 2 passes on the flat surface → 1 pass on the flipped surface → 1 light pass on the vertical surface; final thickness 410 mm, width 1190 mm; final forging temperature 965℃, after pressing, return to the furnace and heat to 1180℃, hold for 2 hours; final macroscopic morphology as shown. Figure 4 As shown.

[0018] Fifth forging: 60 mm flat reduction, 15 mm vertical reduction, step size 150 mm; 1 flat pressing pass → 1 flip pressing pass → 1 light vertical pressing pass; forging thickness 290 mm, width 1230 mm; final forging temperature 960℃; reheat to 1170℃ in the furnace, hold for 2 hours; macroscopic morphology after forging as shown. Figure 6 As shown.

[0019] Sixth forging: 50 mm flat reduction, 20 mm vertical reduction, step size 100 mm; 1 flat pressing pass → 1 flip pressing pass → 1 light vertical pressing pass → shaping; final forging temperature 965 ℃, shaping temperature 920 ℃; forging thickness 190 mm, width 1250 mm; macroscopic morphology after forging as shown... Figure 7 As shown.

[0020] The forging billet produced by this process has a final width of 1250 mm, a smooth surface, no serious defects, and an average width expansion rate of 21.8%. Example

[0021] First forging: 35 mm reduction, 300 mm step, surface rolling, forging dimension 1070 mm, final forging temperature 975℃; immediately after forging, return to the furnace and reheat to 1160℃, hold for 2.5 h.

[0022] Second forging: 45 mm reduction, 300 mm step, 3 passes for flat surface pressing → 3 passes for flipping pressing → 2 passes for each 45° chamfering → vertical surface shaping; thickness after forging 800 mm, width 1090 mm; final forging temperature 960 ℃; reheat to 1160 ℃ in the furnace and hold for 2 hours.

[0023] Third forging: 60 mm reduction, 300 mm step, 2 passes for flat surface pressing → 1 pass for flipping pressing → 2 passes for each 30° chamfering → vertical surface shaping; thickness after forging: 620 mm, width: 1145 mm; final forging temperature: 950 ℃, after pressing with clamps, return to the furnace for heating, hold at 1180 ℃ for 3 hours.

[0024] Fourth forging: 70 mm flat reduction, 25 mm vertical reduction, 150 mm step length, 2 passes flat forging → 1 pass flipping forging → 1 pass light vertical forging; forging thickness 410 mm, width 1200 mm; final forging temperature 965 ℃, reheat to 1170 ℃ in the furnace, hold for 3 hours.

[0025] Fifth forging: 60 mm flat reduction, 20 mm vertical reduction, 150 mm step length, 1 flat pressing pass → 1 flip pressing pass → 1 light vertical pressing pass; forging thickness 290 mm, width 1235 mm; final forging temperature 970 ℃; reheat to 1180 ℃ in the furnace and hold for 2 h.

[0026] Sixth forging: 50 mm flat reduction, 20 mm vertical reduction, 150 mm step length, 1 flat pressing pass → 1 flip pressing pass → 1 light vertical pressing pass → shaping; final forging temperature 960℃, shaping temperature 910℃; forging thickness 190 mm, width 1255 mm.

[0027] The forging billet produced by this process has a final width of 1255 mm, a smooth surface, no serious defects, and an average width expansion rate of 21.0%. Example

[0028] First forging: 40 mm reduction, 200 mm step, surface rolling, forging dimension 1060 mm, final forging temperature 955℃; immediately after forging, return to the furnace and heat to 1190℃, hold for 2 hours.

[0029] Second forging: 45 mm reduction, 300 mm step, 3 passes for flat surface pressing → 3 passes for flipping pressing → 2 passes for each 45° chamfering → vertical surface shaping; after forging, the thickness is 790 mm and the width is 1070 mm, and the final forging temperature is 975 ℃; immediately after forging, return to the furnace and heat to 1190 ℃ for 2.5 h.

[0030] Third heat: 60 mm reduction, 300 mm step, 2 passes for flat surface pressing → 1 pass for flipping pressing → 2 passes for each 30° chamfering → vertical surface shaping; after forging, the thickness is 610 mm and the width is 1125 mm, and the final forging temperature is 960 ℃; after pressing the clamp handle, return it to the furnace and heat it to 1180 ℃, and hold it for 2.5 h.

[0031] Fourth forging: 60 mm flat reduction, 30 mm vertical reduction, 200 mm step length, 2 passes flat forging → 1 pass flipping forging → 1 pass light vertical forging; forging thickness 430 mm, width 1195 mm, final forging temperature 960℃, press the clamp and then return to the furnace to heat to 1180℃, hold for 3 h.

[0032] Fifth forging: 60 mm flat reduction, 20 mm vertical reduction, 200 mm step length, 1 pass flat pressing → 1 pass flipping pressing → light pressing and straightening of vertical surface; thickness after forging is 310 mm, width is 1230 mm, final forging temperature is 965 ℃, reheat to 1175 ℃ and hold for 2.5 h.

[0033] Sixth forging: 60 mm flat reduction, 15 mm vertical reduction, 100 mm step length, 1 flat pressing pass → 1 flip pressing pass → light vertical pressing, straightening and side bending → shaping; final forging temperature 960 ℃, shaping temperature 905 ℃; forging thickness 190 mm, width 1260 mm.

[0034] The forging billet produced by this process has a final width of 1260 mm, a smooth surface, no serious defects, and an average width expansion rate of 23.0%.

[0035] Comparative Example 1 Small ingot upsetting rough forging: Using Φ930mm electroslag round ingots as raw materials, after homogenization treatment, the process of upsetting forging-ordinary flat anvil drawing forging is selected, and the process is completed in ten forging passes. The forging reduction is controlled between 20mm and 60mm, and the final forging temperature is controlled between 950℃ and 980℃.

[0036] Due to the use of upsetting technology and multiple forging passes, the surface suffered severe damage and cracking. The final thickness of the forged billet was 190 mm, and the width was 1210 mm, extending the forging time by approximately 40%. Figure 8 Macroscopic morphological observation shows that the forging surface produced by this method has severe cracks.

[0037] Comparative Example 2 Large ingot drawing and forging: Using Φ1235 mm electroslag round ingots as raw materials, after homogenization treatment, the process is carried out by ordinary flat anvil drawing forging, which is completed in ten forging passes. The forging reduction is controlled between 20 mm and 60 mm, and the final forging temperature is controlled between 950℃ and 980℃.

[0038] Due to the small forging reduction and insufficient lateral metal flow, the final forging billet thickness was only 200 mm, and the width only reached 1300 mm, with an average width spread of 11.1%, extending the forging time by approximately 40%. Figure 9 Macroscopic morphological observation shows that the surface cracks are severe in this method.

[0039] Comparative Example 3 Φ1100 ingot normal drawing and forging process: Φ1100 mm electroslag round ingots were used as raw materials, and were homogenized before forging. The forging process was carried out using ordinary flat anvil drawing, and was completed in six passes. The forging reduction was controlled between 30 mm and 70 mm, and the final forging temperature was controlled between 950℃ and 990℃.

[0040] Due to insufficient lateral metal flow, the final thickness of the forging was 200 mm, and the width only reached 1150 mm, with an average width spread of 10.3%, failing to reach a width of over 1200 mm. Figure 10 Macroscopic morphological observation and measurement show that the average width expansion rate of the elongation forging method is more than 10% lower than that of the embodiment of the present invention.

Claims

1. A method of high width spread elongation of a difficult-to-deform high-silicon alloy electroslag ingot by drawing and forging, characterized by, According to the width of the forging blank to be obtained, combined with the size of the actual available steel ingot, a suitable small ingot type is selected for forging; the width of the forging blank required in the case is at least 1200mm, and the suitable small ingot type is Φ1100mm electroslag round ingot; the steel ingot needs to be homogenized before forging, and is taken out of the furnace after homogenization treatment for forging; the total lengthening of the forging includes six heats, and the main operations and parameter ranges of each heat are as follows: The first heat: the forging reduction is 20mm-40mm, the step is 200mm-300mm, the rolling method is flat, the surface of the steel ingot is flattened, the slag groove and pit defects on the surface of the steel ingot are removed, and the forging size is controlled within 1050mm-1070mm; the final forging temperature is not less than 950℃, the intermediate blank is immediately reheated after forging, the temperature is 1150℃-1200℃, the temperature is maintained for 2h-3h after permeation, and the hot plasticity is recovered; The second heat: the reduction is 40mm-50mm, the step is 200mm-300mm, the flat surface is pressed 2-3 times → the surface is turned over and pressed 2-3 times → the 45° chamfer is pressed 2-3 times → the vertical surface is flattened; the size after forging is 780mm-820mm in thickness and 1060mm-1100mm in width; the final forging temperature is not less than 950℃, and the intermediate blank is immediately reheated after forging, and the heating process is the same as the first heat; The third heat: the reduction is 50mm-70mm, the step is 200mm-300mm; the operation sequence is the same as the second heat, due to the large width-thickness ratio of the intermediate blank, the chamfer angle is reduced to 30°, so as to avoid generating forging offset couple, damaging the equipment and affecting the forging effect; the size after forging is 570mm-610mm in thickness and 1120mm-1150mm in width; the final forging temperature is not less than 950℃, and the intermediate blank is reheated after pressing the jaws, and the reheating process is the same as the previous heat; The fourth heat: the flat surface reduction is 60mm-70mm, the vertical surface reduction is 20mm-30mm, and the step is 150mm-200mm; the flat surface is pressed 1-2 times → the surface is turned over and pressed 1-2 times → the vertical surface is lightly pressed; the size after forging is 390mm-430mm in thickness and 1180mm-1200mm in width, at this time the width-thickness ratio of the intermediate blank is too large, and the chamfer forging method is no longer applicable; the final forging temperature is the same as the previous heat, and the process is the same as the previous heat; The fifth heat: the flat surface reduction is 50mm-60mm, the vertical surface reduction is 15mm-25mm, and the step is 150mm-200mm; the flat surface is pressed 1-2 times → the surface is turned over and pressed 1-2 times → the vertical surface is lightly pressed and straightened; the size after forging is 270mm-300mm in thickness and 1220mm-1240mm in width; the final forging temperature and reheating process are the same as the previous heat; The sixth heat: the flat surface reduction is 50mm-60mm, the vertical surface reduction is 15mm-25mm, and the step is 100mm-150mm; the flat surface is pressed 1-2 times → the surface is turned over and pressed 1-2 times → the vertical surface is lightly pressed and straightened; the final forging temperature is not less than 950℃, and the shaping temperature is not less than 900℃; the size after forging is 180mm-210mm in thickness and 1230mm-1260mm in width.

2. The high-width-expansion lengthening forging method of the difficult-to-deform high-silicon alloy electroslag round ingot according to claim 1, characterized in that, First fire: reduction 40mm, step 300mm, rolling surface, size after forging 1060mm, final forging temperature 990℃, immediately after forging, heating to 1170℃ in the furnace, holding for 2.5h; Second fire: reduction 50mm, step 300mm; plane pressing 3 times → turning over pressing 2 times → 45° chamfering each 2 times → vertical surface shaping; thickness after forging 810mm, width 1080mm; final forging temperature 965℃; heating to 1180℃ in the furnace, holding for 3h; Third fire: reduction 55mm, step 250mm; plane pressing 2 times → turning over pressing 2 times → 30° chamfering each 2 times → vertical surface shaping; thickness after forging 590mm, width 1140mm; final forging temperature 950℃, after pressing the handle, heating to 1180℃ in the furnace, holding for 3h; Fourth fire: plane reduction 60mm, vertical surface reduction 20mm, step 200mm; plane pressing 2 times → turning over pressing 1 time → vertical surface light pressing 1 time; thickness after forging 410mm, width 1190mm; final forging temperature 965℃, after pressing the handle, heating to 1180℃ in the furnace, holding for 2h; Fifth fire: plane reduction 60mm, vertical surface reduction 15mm, step 150mm; plane pressing 1 time → turning over pressing 1 time → vertical surface light pressing 1 time; thickness after forging 290mm, width 1230mm; final forging temperature 960℃; heating to 1170℃ in the furnace, holding for 2h; Sixth fire: plane reduction 50mm, vertical surface reduction 20mm, step 100mm; plane pressing 1 time → turning over pressing 1 time → vertical surface light pressing 1 time → shaping; final forging temperature 965℃, shaping temperature 920℃; thickness after forging 190mm, width 1250mm; The final width of the process forging blank reaches 1250mm, the surface is flat, and there is no serious defect, and the average width expansion rate is 21.8%.

3. The high width expansion rate elongation forging method of the difficult deformation high-silicon alloy electroslag round ingot according to claim 1, characterized in that, First fire: reduction 35mm, step 300mm, rolling surface, size after forging 1070mm, final forging temperature 975℃; immediately after forging, heating to 1160℃ in the furnace, holding for 2.5h; Second fire: reduction 45mm, step 300mm, plane pressing 3 times → turning over pressing 3 times → 45° chamfering each 2 times → vertical surface shaping; thickness after forging 800mm, width 1090mm; final forging temperature 960℃; heating to 1160℃ in the furnace, holding for 2h; Third fire: reduction 60mm, step 300mm, plane pressing 2 times → turning over pressing 1 time → 30° chamfering each 2 times → vertical surface shaping; thickness after forging 620mm, width 1145mm; final forging temperature 950℃, after pressing the handle, heating in the furnace, 1180℃ holding for 3h; Fourth fire: plane reduction 70mm, vertical surface reduction 25mm, step 150mm, plane pressing 2 times → turning over pressing 1 time → vertical surface light pressing 1 time; thickness after forging 410mm, width 1200mm; final forging temperature 965℃, heating to 1170℃ in the furnace, holding for 3h; Fifth fire: plane reduction 60 mm, vertical surface reduction 20 mm, step length 150 mm, plane pressure 1 time → turn over pressure 1 time → vertical surface light pressure 1 time; thickness after forging 290 mm, width 1235 mm; final forging temperature 970℃; heating to 1180℃ in the furnace, holding for 2h; Sixth fire: plane reduction 50 mm, vertical surface reduction 20 mm, step length 150 mm, plane pressure 1 time → turn over pressure 1 time → vertical surface light pressure 1 time → shaping; final forging temperature 960℃, shaping temperature 910℃; thickness after forging 190 mm, width 1255 mm; The final width of the forged billet reaches 1255 mm, the surface is smooth, and there is no serious defect, and the average width expansion rate is 21.0%.

4. The high-silicon alloy electric slag round ingot high-width expansion rate elongation forging method according to claim 1, characterized in that, First fire: reduction 40 mm, step length 200 mm, rolling surface, size after forging 1060 mm, final forging temperature 955℃; immediately after forging, heating to 1190℃ in the furnace, holding for 2h; Second fire: reduction 45 mm, step length 300 mm, plane pressure 3 times → turn over pressure 3 times → 45° chamfering each 2 times → vertical surface shaping; thickness after forging 790 mm, width 1070 mm, final forging temperature 975℃; immediately after forging, heating to 1190℃ in the furnace, holding for 2.5h; Third fire: reduction 60 mm, step length 300 mm, plane pressure 2 times → turn over pressure 1 time → 30° chamfering each 2 times → vertical surface shaping; thickness after forging 610 mm, width 1125 mm, final forging temperature 960℃; after pressing the handle, heating to 1180℃ in the furnace, holding for 2.5h; Fourth fire: plane reduction 60 mm, vertical surface reduction 30 mm, step length 200 mm, plane pressure 2 times → turn over pressure 1 time → vertical surface light pressure 1 time; thickness after forging 430 mm, width 1195 mm, final forging temperature 960℃, after pressing the handle, heating to 1180℃ in the furnace, holding for 3h; Fifth fire: plane reduction 60 mm, vertical surface reduction 20 mm, step length 200 mm, plane pressure 1 time → turn over pressure 1 time → vertical surface light pressure, straightening; thickness after forging 310 mm, width 1230 mm, final forging temperature 965℃, heating to 1175℃ in the furnace, holding for 2.5h; Sixth fire: plane reduction 60 mm, vertical surface reduction 15 mm, step length 100 mm, plane pressure 1 time → turn over pressure 1 time → vertical surface light pressure, straightening and side bending → shaping; final forging temperature 960℃, shaping temperature 905℃; thickness after forging 190 mm, width 1260 mm; The final width of the forged billet reaches 1260 mm, the surface is smooth, and there is no serious defect, and the average width expansion rate is 23.0%.

Images