CN103509925A - Low-cost production process for increasing fault detection qualification rate of Q345R steel plates - Google Patents
Low-cost production process for increasing fault detection qualification rate of Q345R steel plates Download PDFInfo
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Abstract
The invention relates to a low-cost production process for increasing the fault detection qualification rate of Q345R steel plates. The process mainly comprises the following steps: performing molten iron feeding with the content of S less than or equal to 0.010%, performing converter tapping with the total oxygen content controlled to be less than or equal to 20 ppm, and performing LF refining with the content of S controlled to be less than or equal to 0.005%; when the steel plate thickness is more than or equal to 60 mm or the compression ratio is less than or equal to 10, performing on-line shearing and RH refining, wherein the degree of vacuum is less than or equal to 5.0 mbar, and the maintaining time is more than or equal to 12 min; when the product thickness is controlled to be 12-80 mm, controlling the fine rolling temperature to be 1020-870 DEG C and the finish rolling temperature to be 820-830 DEG C, and discharging and cooling after the self-tempering temperature is controlled to be 700-680 DEG C; when the product thickness is less than or equal to 60 mm and the discharge temperature is more than or equal to 350 DEG C, shearing after stacking for slow-cooling for 72 h. The production process achieves the purpose of increasing the fault detection qualification rate of Q345R steel plates with low cost through the procedures of scientific and reasonable distribution and control of sulfur, deep deoxidation, RH refining, steel plate stacking for slow-cooling and the like.
Description
Technical field
The present invention relates to a kind of production technique of steel plate of pressure vessel, is specifically a kind of low cost production thereof of the Q345R of lifting steel plate inspection qualification rate, belongs to field of metallurgy.
Background technology
Q345R steel is that yield strength is the ordinary low-alloy steel pressurized vessel personality board of 340MPa level, and it has good comprehensive mechanical property and processing performance, is that China's purposes is the widest, the maximum pressurized vessel steel plate special of consumption at present.Therefore, all there is to stricter requirement on its surface and internal soundness.But Q345R steel plate inspection disqualification rate is high, be all one of problem of the most often occurring of its production process all the time, through correlation detection, analyze discovery, cause the underproof major defect of Q345R steel plate inspection to have center segregation, centre burst and MnS to be mingled with etc.Therefore related production corporate boss will be by (1) strengthening refining means, further control the impurity contents such as phosphorus in molten steel, sulphur; (2) the proper extension soft blow time; (3) improve RH vacuum tightness and extend the pumpdown time; (4) strengthen arc alignment precision of continuous caster and improvement and depress effect, improve slab quality; (5) strengthen casting blank stacking slow cooling; (6) adopt high temperature to depress greatly, strengthen sex change infiltration; (7) steel plate rolls off the production line the measures such as stacking slow cooling to improve Q345R steel plate inspection qualification rate.
Chinese patent CN102002630A discloses a kind of " anti-HIC steels for pressure vessel use Q345R-Z35 special heavy plate and production method thereof ", and its production method of taking comprises the following steps: the technique such as molten iron KR desulfurization, converter smelting, LF are concise, VD vacuum outgas, die casting cast, Heating Steel Ingots, rolling, ACC are cooling, aligning, steel plate cooling in heap, normalizing thermal treatment; This invention by reasonable component design, Process Route, developed special thick steel heavy plate for pressure vessels, detected result shows, one-level flaw detection qualification rate, performance initial test qualification rate all reach 100%, in addition anti-lamellar tearing performance reaches Z35 rank, and anti-hydrogen induced cracking detected result is excellent; Weak point is to adopt die casting cast, and has increased normalizing heat treatment step, has both reduced production efficiency, has increased again production cost.
Summary of the invention
Technical problem to be solved by this invention is, a kind of low cost production thereof of the Q345R of lifting steel plate inspection qualification rate is provided, this technique, mainly by the technological measures such as control sulphur, deoxidation, RH refining and steel plate stacking slow cooling are distributed scientifically and rationally, reaches the object of the low-cost Q345R of lifting steel plate inspection qualification rate.
The present invention solves the technical scheme of above technical problem:
A low cost production thereof that promotes Q345R steel plate inspection qualification rate, comprising: hot metal pre process procedures, bessemerize operation, LF refining procedure, RH refining procedure, continuous casting working procedure, strand cooling in heap, heating, high-pressure water descaling, rolling, ultrafast but cold, hot straightening, steel plate cooling in heap, shear surface examination, manually UT (Ultrasonic Testing); In described hot metal pre process procedures, the blast-melted blowing magnesium+lime powder of taking carries out pre-treatment, and fully skims after pre-treatment; In described continuous casting working procedure; continuous casting adopts full guard casting; it is characterized in that: by the technological measures such as control sulphur, deep deoxidation, RH refining and steel plate stacking slow cooling are distributed scientifically and rationally, reach the object of the low-cost Q345R of lifting steel plate inspection qualification rate, concrete steps are as follows:
In described hot metal pre process procedures, make converter enter S≤0.010% in stove molten iron;
Described bessemerizing in operation, adds 20kg aluminium block by every 100ppm oxygen after converter tapping and carries out deep deoxidation, guarantees that final total oxygen content TO is controlled at below 20ppm;
In described LF refining procedure, in converter tapping process, slag charge adds by 8-10kg steel per ton, controls sulphur content S≤0.005%;
In described RH refining procedure, when the strand in rolling process requires rolled sheet material thickness >=60mm or rolling compression ratio≤10 on-line shearing plate, this strand need to enter RH refining procedure, otherwise this part is omitted, the condition of RH refining procedure requires vacuum tightness≤5.0mbar, hold-time >=12min while being vacuum-treat;
In described continuous casting working procedure, constant pulling rate 0.9-1.0m/min;
Described rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1100～1200 ℃, single pass draft is controlled at more than 15%, optimizes intermediate blank design, when product thickness h is controlled at 12-80mm, workpiece thickness is controlled between 3.2h-1.6h, finish rolling start rolling temperature is controlled at 1020-870 ℃, and finishing temperature is controlled at 820-830 ℃, rolls off the production line cooling after red temperature is to 700-680 ℃;
In described steel plate heap cooling working procedure, the steel plate that is the following on-line shearing of 60mm for product thickness need to adopt steel plate cooling in heap, and temperature >=350 ℃ of now rolling off the production line, shear after stacking slow cooling 72h.
The technical scheme that the present invention further limits is:
Further, more than the required alloy of smelting process and slag charge all need fully toast 12h at the bakery of >=40 ℃.
Further, in LF refining procedure and RH refining procedure, treat, under the qualified prerequisite of thermometric sampling judgement, by pure calcium line 150-180m/ stove feeding, to feed silk and finish rear quiet stirring >=10min.
Further, all alloys and slag charge all need fully toast at the bakery of 40 ℃; In hot metal pre process procedures, make converter enter S:0.008% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 8kg steel per ton, controls sulphur content S:0.003%, and pure calcium line is according to the feeding of 150m/ stove, the quiet 12min that stirs after feeding; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling compression ratio≤10 on-line shearing plate, this strand need to enter RH refining procedure, when now the condition of RH refining procedure is vacuum-treat, require vacuum tightness 4.8mbar, hold-time 12min, otherwise this part is omitted, pure calcium line is according to 150m, stove feeding, the quiet 12min that stirs after feeding; In continuous casting working procedure, constant pulling rate 0.9m/min; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1100 ℃, single pass draft is controlled at 15%, optimizes intermediate blank design, when product thickness h is 20mm, workpiece thickness is controlled at 2.6h, finish rolling start rolling temperature is controlled at 960 ℃, and finishing temperature is controlled at 820 ℃, wait return red roll off the production line after to 700 ℃ cooling; Steel plate cooling in heap, roll off the production line 350 ℃ of temperature of the steel plate that is 23mm for product thickness.
Further, all alloys and slag charge all need fully toast at the bakery of 45 ℃; In hot metal pre process procedures, make converter enter S:0.009% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 9kg steel per ton, controls sulphur content S:0.004%, and pure calcium line is according to the feeding of 160m/ stove, the quiet 11min that stirs after feeding; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling compression ratio≤10 on-line shearing plate, this strand need to enter RH refining procedure, Steel Plate Vacuum requires vacuum tightness: 4.9mbar while processing, hold-time: 13min, pure calcium line is according to the feeding of 160m/ stove, the quiet 11min that stirs after feeding; In continuous casting working procedure, constant pulling rate 0.95m/min; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1150 ℃, single pass draft is controlled at 16.7%, optimizes intermediate blank design, when product thickness h is controlled at 45mm, workpiece thickness is controlled between 2.0h, finish rolling start rolling temperature is controlled at 890 ℃, and finishing temperature is controlled at 830 ℃, wait return red roll off the production line after to 680 ℃ cooling; Steel plate cooling in heap, roll off the production line 355 ℃ of temperature of the steel plate that is 35mm for product thickness.
Further, all alloys and slag charge all need fully toast at the bakery of 50 ℃; In hot metal pre process procedures, make converter enter S:0.010% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 10kg steel per ton, controls sulphur content S:0.005%, and pure calcium line is according to the feeding of 180m/ stove, the quiet 12min that stirs after feeding; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling compression ratio≤10 on-line shearing plate, this strand need to enter RH refining procedure, Steel Plate Vacuum requires vacuum tightness: 5.0mbar while processing, hold-time: 14min, pure calcium line is according to the feeding of 180m/ stove, the quiet 12min that stirs after feeding; In continuous casting working procedure, constant pulling rate 1.0m/min; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1200 ℃, single pass draft is controlled at 19.8%, optimizes intermediate blank design, when product thickness h is controlled at 55mm, workpiece thickness is controlled between 1.8h, finish rolling start rolling temperature is controlled at 870 ℃, and finishing temperature is controlled at 830 ℃, wait return red roll off the production line after to 680 ℃ cooling; Steel plate cooling in heap, roll off the production line 360 ℃ of temperature of the steel plate that is 50mm for product thickness.
In a word, the present invention, by the technological measures such as control sulphur, deep deoxidation, RH refining and steel plate stacking slow cooling are distributed scientifically and rationally, reaches extremely >=99% object of the low-cost Q345R of lifting steel plate inspection qualification rate.
Embodiment
embodiment 1
Nanjing Unite Steel Co., Ltd medium plate mill, May, Q345R; In converter operation, to entering stove molten iron, adopt blowing magnesium+lime powder technique to carry out pre-treatment, enter mean content of sulfur S=0.008% in stove molten iron, after pre-treatment, fully skim; In LF refining procedure, LF departures mean content of sulfur S=0.003%; RH processes, and steel plate steel rolling compression ratio is 1.4, shearing thickness 60mm, vacuum tightness 4.8mbar, hold-time 12min; In LF refining process, under composition and the qualified prerequisite of temperature, by pure calcium line 150m/ stove feeding, feeding silk, to finish the rear quiet time of stirring be 12min; At continuous casting working procedure, adopt total process protective casting, constant pulling rate 0.9m/min; Strengthen casting machine situation and check and safeguard, in be strict controlled in ± 3mm of arc deviation, in be controlled at ± 3mm of liquid fluctuating; Above (comprising B1.0, B0.5 and the C level) ratio of continuously cast bloom low multiple quality B1.0 is 93.33%; The all alloys of smelting process and slag charge all fully toast at the bakery of 40 ℃; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1100 ℃, single pass draft is controlled at 15%, optimizes intermediate blank design, when product thickness h is 20mm, workpiece thickness is controlled at 2.6h, finish rolling start rolling temperature is controlled at 960 ℃, and finishing temperature is controlled at 820 ℃, wait return red roll off the production line after to 700 ℃ cooling; At finishing procedure, for product thickness, at 23mm steel plate, after 350 ℃ of stacking slow cooling, after 72h, shear.
embodiment 2
Nanjing Unite Steel Co., Ltd medium plate mill, June, Q345R; In converter operation, enter mean content of sulfur S=0.009% in stove molten iron, and fully skim after pre-treatment; At refining procedure, LF departures mean content of sulfur S=0.004%; RH processes, and steel plate steel rolling compression ratio is 1.5, shearing thickness 70mm, vacuum tightness 4.9mbar, hold-time 13min; LF(or LF-RH) in refining process under composition and the qualified prerequisite of temperature, by pure calcium line 160m/ stove feeding, feed silk and finish the rear quiet 11min of stirring; At continuous casting working procedure, adopt total process protective casting, constant pulling rate 0.95m/min; Strengthen casting machine situation and check and safeguard, in be strict controlled in ± 3mm of arc deviation, in be controlled at ± 3mm of liquid fluctuating; Above (comprising B1.0, B0.5 and the C level) ratio of continuously cast bloom low multiple quality B1.0 is 96%; The all alloys of smelting process and slag charge all fully toast at the bakery of 45 ℃; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1150 ℃, single pass draft is controlled at 16.7%, optimizes intermediate blank design, when product thickness h is controlled at 45mm, workpiece thickness is controlled between 2.0h, finish rolling start rolling temperature is controlled at 890 ℃, and finishing temperature is controlled at 830 ℃, wait return red roll off the production line after to 680 ℃ cooling; At finishing procedure, for product thickness, after rolling off the production line 355 ℃ of stacking slow cooling of temperature, shears after 72h steel plate between 35mm.
embodiment 3
Nanjing Unite Steel Co., Ltd medium plate mill July, Q345R; In converter operation, enter mean content of sulfur S=0.010% in stove molten iron, and fully skim after pre-treatment; At refining procedure, LF departures mean content of sulfur S=0.005%; RH processes, and steel plate steel rolling compression ratio is 1.4, shearing thickness 80mm, vacuum tightness 5.0mbar, hold-time 14min; LF(or LF-RH) in refining process under composition and the qualified prerequisite of temperature, by pure calcium line 180m/ stove feeding, feed silk and finish the rear quiet time 12min that stirs; At continuous casting working procedure, adopt total process protective casting, constant pulling rate 1.0m/min; Strengthen casting machine situation and check and safeguard, in be strict controlled in ± 3mm of arc deviation, in be controlled at ± 3mm of liquid fluctuating; Above (comprising B1.0, B0.5 and the C level) ratio of continuously cast bloom low multiple quality B1.0 is 96.33%; The all alloys of smelting process and slag charge all fully toast at the bakery of 50 ℃; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1200 ℃, single pass draft is controlled at 19.8%, optimizes intermediate blank design, when product thickness h is controlled at 55mm, workpiece thickness is controlled between 1.8h, finish rolling start rolling temperature is controlled at 870 ℃, and finishing temperature is controlled at 830 ℃, wait return red roll off the production line after to 680 ℃ cooling; At finishing procedure, for product thickness, after rolling off the production line 360 ℃ of stacking slow cooling of temperature, shears after 72h steel plate between 50mm.
Following table is the actual detected result of output steel in each embodiment:
Table 1 is the actual detected result of output steel in embodiment mono-to three;
And do not adopt the Q345R steel plate of previous explained hereafter, flaw detection qualification rate low (average qualification rate only 92.34%) and poor stability (be up to 98.94%, minimum is 88.35%); Adopt described in patent of the present invention after production technique, the Q345R flaw detection average qualification rate of producing is continually and steadily >=99%, and by the technological measures such as control sulphur, deep deoxidation, RH refining and steel plate stacking slow cooling are distributed scientifically and rationally, reached object cheaply, production technique provided by the invention has reached the object that promotes Q345R steel plate inspection qualification rate and reduce production costs.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (6)
1. a low cost production thereof that promotes Q345R steel plate inspection qualification rate, comprising: hot metal pre process procedures, bessemerize operation, LF refining procedure, RH refining procedure, continuous casting working procedure, strand cooling in heap, heating, high-pressure water descaling, rolling, ultrafast but cold, hot straightening, steel plate cooling in heap, shear surface examination, manually UT (Ultrasonic Testing); In described hot metal pre process procedures, the blast-melted blowing magnesium+lime powder of taking carries out pre-treatment, and fully skims after pre-treatment; In described continuous casting working procedure; continuous casting adopts full guard casting; it is characterized in that: by the technological measures such as control sulphur, deep deoxidation, RH refining and steel plate stacking slow cooling are distributed scientifically and rationally, reach the object of the low-cost Q345R of lifting steel plate inspection qualification rate, concrete steps are as follows:
In described hot metal pre process procedures, make converter enter S≤0.010% in stove molten iron;
Described bessemerizing in operation, adds 20kg aluminium block by every 100ppm oxygen after converter tapping and carries out deep deoxidation, guarantees that final total oxygen content TO is controlled at below 20ppm;
In described LF refining procedure, in converter tapping process, slag charge adds by 8-10kg steel per ton, controls sulphur content S≤0.005%;
In described RH refining procedure, when the strand in rolling process requires rolled sheet material thickness >=60mm or rolling compression ratio≤10 on-line shearing plate, this strand need to enter RH refining procedure, otherwise this part is omitted, the condition of RH refining procedure requires vacuum tightness≤5.0mbar, hold-time >=12min while being vacuum-treat;
In described continuous casting working procedure, constant pulling rate 0.9-1.0m/min;
Described rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1100～1200 ℃, single pass draft is controlled at more than 15%, optimizes intermediate blank design, when product thickness h is controlled at 12-80mm, workpiece thickness is controlled between 3.2h-1.6h, finish rolling start rolling temperature is controlled at 1020-870 ℃, and finishing temperature is controlled at 820-830 ℃, rolls off the production line cooling after red temperature is to 700-680 ℃;
In described steel plate heap cooling working procedure, the steel plate that is the following on-line shearing of 60mm for product thickness need to adopt steel plate cooling in heap, and temperature >=350 ℃ of now rolling off the production line, shear after stacking slow cooling 72h.
2. production technique according to claim 1, is characterized in that: more than the required alloy of smelting process and slag charge all need fully toast 12h at the bakery of >=40 ℃.
3. production technique according to claim 1, is characterized in that: in LF refining procedure and RH refining procedure, treat, under the qualified prerequisite of thermometric sampling judgement, by pure calcium line 150-180m/ stove feeding, to feed silk and finish rear quiet stirring >=10min.
4. production technique according to claim 1, is characterized in that: all alloys and slag charge all need fully toast at the bakery of 40 ℃; In hot metal pre process procedures, make converter enter S:0.008% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 8kg steel per ton, controls sulphur content S:0.003%, and pure calcium line is according to the feeding of 150m/ stove, the quiet 12min that stirs after feeding; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling compression ratio≤10 on-line shearing plate, this strand need to enter RH refining procedure, when now the condition of RH refining procedure is vacuum-treat, require vacuum tightness 4.8mbar, hold-time 12min, otherwise this part is omitted, pure calcium line is according to 150m, stove feeding, the quiet 12min that stirs after feeding; In continuous casting working procedure, constant pulling rate 0.9m/min; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1100 ℃, single pass draft is controlled at 15%, optimizes intermediate blank design, when product thickness h is 20mm, workpiece thickness is controlled at 2.6h, finish rolling start rolling temperature is controlled at 960 ℃, and finishing temperature is controlled at 820 ℃, wait return red roll off the production line after to 700 ℃ cooling; Steel plate cooling in heap, roll off the production line 350 ℃ of temperature of the steel plate that is 23mm for product thickness.
5. production technique according to claim 1, is characterized in that: all alloys and slag charge all need fully toast at the bakery of 45 ℃; In hot metal pre process procedures, make converter enter S:0.009% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 9kg steel per ton, controls sulphur content S:0.004%, and pure calcium line is according to the feeding of 160m/ stove, the quiet 11min that stirs after feeding; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling compression ratio≤10 on-line shearing plate, this strand need to enter RH refining procedure, Steel Plate Vacuum requires vacuum tightness: 4.9mbar while processing, hold-time: 13min, pure calcium line is according to the feeding of 160m/ stove, the quiet 11min that stirs after feeding; In continuous casting working procedure, constant pulling rate 0.95m/min; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1150 ℃, single pass draft is controlled at 16.7%, optimizes intermediate blank design, when product thickness h is controlled at 45mm, workpiece thickness is controlled between 2.0h, finish rolling start rolling temperature is controlled at 890 ℃, and finishing temperature is controlled at 830 ℃, wait return red roll off the production line after to 680 ℃ cooling; Steel plate cooling in heap, roll off the production line 355 ℃ of temperature of the steel plate that is 35mm for product thickness.
6. production technique according to claim 1, is characterized in that: all alloys and slag charge all need fully toast at the bakery of 50 ℃; In hot metal pre process procedures, make converter enter S:0.010% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 10kg steel per ton, controls sulphur content S:0.005%, and pure calcium line is according to the feeding of 180m/ stove, the quiet 12min that stirs after feeding; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling compression ratio≤10 on-line shearing plate, this strand need to enter RH refining procedure, Steel Plate Vacuum requires vacuum tightness: 5.0mbar while processing, hold-time: 14min, pure calcium line is according to the feeding of 180m/ stove, the quiet 12min that stirs after feeding; In continuous casting working procedure, constant pulling rate 1.0m/min; Rolling process is divided into roughing and finish rolling two stage rolling, rough rolling step takes high temperature to depress greatly operation, roughing start rolling temperature is controlled at 1200 ℃, single pass draft is controlled at 19.8%, optimizes intermediate blank design, when product thickness h is controlled at 55mm, workpiece thickness is controlled between 1.8h, finish rolling start rolling temperature is controlled at 870 ℃, and finishing temperature is controlled at 830 ℃, wait return red roll off the production line after to 680 ℃ cooling; Steel plate cooling in heap, roll off the production line 360 ℃ of temperature of the steel plate that is 50mm for product thickness.
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| CN110846585A (en) * | 2019-10-28 | 2020-02-28 | 南京钢铁股份有限公司 | Q345C steel plate for railway bogie and manufacturing method thereof |
| CN115369302A (en) * | 2022-08-03 | 2022-11-22 | 新疆八一钢铁股份有限公司 | Production method of Q235-T steel plate for papermaking roller |
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| CN108330431A (en) * | 2018-03-09 | 2018-07-27 | 泰州市大明不锈钢有限公司 | A kind of stainless-steel sheet production technology |
| CN110846585A (en) * | 2019-10-28 | 2020-02-28 | 南京钢铁股份有限公司 | Q345C steel plate for railway bogie and manufacturing method thereof |
| CN110846585B (en) * | 2019-10-28 | 2021-09-17 | 南京钢铁股份有限公司 | Q345C steel plate for railway bogie and manufacturing method thereof |
| CN115369302A (en) * | 2022-08-03 | 2022-11-22 | 新疆八一钢铁股份有限公司 | Production method of Q235-T steel plate for papermaking roller |
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