阅读说明：本技术 一种提高桶业用钢加工性能的工艺 (Process for improving processability of steel for barrel industry ) 是由 陈克来 于 2021-08-09 设计创作，主要内容包括：本发明公开了一种提高桶业用钢加工性能的工艺,退火温度小于或等于750℃,通过炉台热电偶进行温度检测,超温小于10℃,炉温不超过850℃,通过炉台热电偶进行温度检测,超温小于20℃,开始冷却温度：内罩表面200℃,卷心温度380℃,冷却时间2-4小时,出炉温度160℃,到平整机温度不低于40℃；2、a：平整延伸率的优化设计：平整延伸率调整到了1.3%±0.1,屈服比为1.4-1.64,断后伸长率为47-54,屈服强度为200-220,抗拉强度为310-380；b、将拉矫张力加大到3500-4000KN；c、带钢头部自动涂油,涂油大小,头尾按0.7g/㎡控制,中部按0.6g/㎡控制；d、切除头尾超差长度部分,保证带钢厚度在控制范围内,满足厚度要求,边部按1.15-1.18mm控制,中间按1.16-1.18mm控制。(The invention discloses a process for improving the processing performance of steel for barrel industry, wherein the annealing temperature is less than or equal to 750 ℃, the temperature is detected by a furnace platform thermocouple, the overtemperature is less than 10 ℃, the furnace temperature is not more than 850 ℃, the temperature is detected by the furnace platform thermocouple, the overtemperature is less than 20 ℃, the cooling temperature is started: the surface of the inner cover is 200 ℃, the coiling core temperature is 380 ℃, the cooling time is 2-4 hours, the tapping temperature is 160 ℃, and the temperature of the inner cover to the temperature of the leveler is not lower than 40 ℃; 2. a: and (3) optimizing design of the leveling elongation: the leveling elongation is adjusted to be 1.3 +/-0.1, the yield ratio is 1.4-1.64, the elongation after fracture is 47-54, the yield strength is 200-; b. increasing the tension to 3500-4000 KN; c. automatically coating oil on the head of the strip steel, wherein the size of the coated oil is controlled according to 0.7g per square meter at the head and the tail, and 0.6g per square meter at the middle part; d. and cutting off the head-tail out-of-tolerance length part to ensure that the thickness of the strip steel is within a control range and meet the thickness requirement, wherein the edge part is controlled according to 1.15-1.18mm, and the middle part is controlled according to 1.16-1.18 mm.)

1. A process for improving the workability of steel for the barrel industry, comprising: 1. the optimized design of the annealing temperature of the steel is that the annealing temperature is less than or equal to 750 ℃, the temperature is detected through a furnace platform thermocouple, the overtemperature is less than 10 ℃, the furnace temperature is not more than 850 ℃, the temperature is detected through the furnace platform thermocouple, the overtemperature is less than 20 ℃, and the cooling temperature is started: the surface of the inner cover is 200 ℃, the coiling core temperature is 380 ℃, the cooling time is 2-4 hours, the tapping temperature is 160 ℃, and the temperature of the inner cover to the temperature of the leveler is not lower than 40 ℃; 2. a: and (3) optimizing design of the leveling elongation: the leveling elongation is adjusted to be 1.3 +/-0.1, the yield ratio is 1.4-1.64, the elongation after fracture is 47-54, the yield strength is 200-; b. increasing the tension to 3500-4000 KN; c. by changing an oil coating control mode, the head part of the strip steel is not coated with oil after the strip steel is divided in the early stage instead of being coated with oil after the strip steel is divided in the prior stage, the head part of the strip steel is automatically coated with oil, the size of the oil is coated, the head and the tail are controlled according to 0.7 g/square meter, and the middle part is controlled according to 0.6 g/square meter; d. and cutting off the head-tail out-of-tolerance length part to ensure that the thickness of the strip steel is within a control range and meet the thickness requirement, wherein the edge part is controlled according to 1.15-1.18mm, and the middle part is controlled according to 1.16-1.18 mm.

Technical Field

The invention relates to a process for improving the processing performance of steel for the barrel industry.

Background

The 200L steel barrel produced by Jiangjiang barrelling industry is mainly matched with and supplied to filling chemical TDI (toluene Diels in China) which belongs to dangerous chemicals, the barrel product is manufactured and processed into required barrel products by purchasing eight steel plate products, then processing and punch forming are carried out, and the required barrel products consist of a barrel cover, a barrel body and a barrel bottom, wherein the barrel cover and a welding line bear huge leakage risks, and according to the actual market demand, the chemical packaging barrel production at present of the company in the local area has about the production capacity of more than 120 thousands (the steel consumption is 1.5 ten thousand tons), and after later-period development, the annual output reaches more than 300 thousands (the steel consumption is more than 3 ten thousand tons).

The steel material of the barrel is of the SPCC (SPCC-HJ brand is specially customized by eight iron and steel companies limited in Xinjiang), the yield strength is 180-250 Mpa, the elongation is more than 35%, and the size requirement is as follows: barrel 1.0 × 920 × 1798mm (from the flat line of opening), barrel lid 1.2 × 1250mm (barrel cut circle phi 653, barrel lid punching press is phi 630mm), dimensional accuracy requirement: the thickness is +/-0.01 mm, the width is 0-2 mm, the on-site flattening rate of a user reaches 100% from the supply of a self-supply user, the actual use qualification rate can only reach about 60%, other products on the production site still have partial products which can not meet the national standard requirements due to uneven thickness and other reasons, most unqualified products are blocked on the production site, are judged or degraded and are manufactured into common barreled products, but individual products also have the defects of non-uniform thickness and steel internal organization performance, the processing and use requirements cannot be met, the measurement of the sampling part of a steel plate is qualified, but unqualified products can be generated in other areas, the defects of non-welding and non-tight edge covering can be caused in the using process of the user, and the risk of leakage of dangerous products in the transportation path can be generated.

Disclosure of Invention

The invention aims to provide a process for improving the processing performance of steel for the barrel industry, which carries out optimization design on key process parameters in the production process in a targeted manner, improves the qualification rate and achieves the aim that the unqualified rate of the untight edge covering of the barrel cover is reduced to within 5 percent from the previous 50 percent.

The technical scheme adopted by the invention is as follows: a process for improving the workability of steel for the barrel industry, comprising: 1. the optimized design of the annealing temperature of the steel is that the annealing temperature is less than or equal to 750 ℃, the temperature is detected through a furnace platform thermocouple, the overtemperature is less than 10 ℃, the furnace temperature is not more than 850 ℃, the temperature is detected through the furnace platform thermocouple, the overtemperature is less than 20 ℃, and the cooling temperature is started: the surface of the inner cover is 200 ℃, the coiling core temperature is 380 ℃, the cooling time is 2-4 hours, the tapping temperature is 160 ℃, and the temperature of the inner cover to the temperature of the leveler is not lower than 40 ℃; 2. a: and (3) optimizing design of the leveling elongation: the leveling elongation is adjusted to be 1.3 +/-0.1, the yield ratio is 1.4-1.64, the elongation after fracture is 47-54, the yield strength is 200-; b. increasing the tension to 3500-4000 KN; c. by changing an oil coating control mode, the head part of the strip steel is not coated with oil after the strip steel is divided in the early stage instead of being coated with oil after the strip steel is divided in the prior stage, the head part of the strip steel is automatically coated with oil, the size of the oil is coated, the head and the tail are controlled according to 0.7 g/square meter, and the middle part is controlled according to 0.6 g/square meter; d. and cutting off the head-tail out-of-tolerance length part to ensure that the thickness of the strip steel is within a control range and meet the thickness requirement, wherein the edge part is controlled according to 1.15-1.18mm, and the middle part is controlled according to 1.16-1.18 mm.

The processing and using performance of the steel plate depends on the change of the steel along with the annealing temperature in the annealing process, different organization structures and performances are obtained, after the steel plate is annealed, the yield platform is eliminated through flattening, the plate shape is improved, the processing performance of a machine set is improved, then the rewinding machine set is used for setting proper tension, and a certain amount of anti-rust oil is coated on the surface of the steel plate, so that the strip steel has good processing and using performance. The raw material used for manufacturing the barrel industry has good reprocessing performance including strength, hardness and the like on one hand, and has higher requirements on thickness control precision requirement, plate shape and the like on the other hand, and belongs to steel for special materials, the annealing aim is to put the steel into a heating furnace, grow crystal grains of the steel by heating, keep the temperature for a period of time after the temperature reaches a certain temperature, and then cool the steel to obtain the required organization structure and performance, because stress concentration, processing hardening and the like exist in the steel, a proper elongation can be set by adopting 4 percent of pressing down amount through a drawing machine, the processing hardening of the steel is eliminated, a yield platform is eliminated, the flatness of the strip steel is improved, the forming performance of the strip steel is improved, finally, the edge wave, middle wave and C, L-shaped bending can be partially eliminated through the bending and straightening of a drawing machine in a recoiling machine set, so that the flatness of the strip steel is improved, the processing performance is improved to a certain extent.

The steel annealing temperature optimization design: the optimized design of annealing and heat preservation of the SPCC steel mainly takes the principle of ensuring higher toughness and good stamping performance as the principle, and achieves the purposes of reducing the hardness of the steel, eliminating cold work hardening and improving the performance of the steel. In the specific design, the temperature control in the annealing process is re-optimized through testing and performance comparison, so that the qualification rate of the mechanical performance of the product stamping is further improved. In the optimized design of steel annealing heat preservation, in order to ensure the punching property of steel and improve the processing toughness of steel, the yield strength and the tensile strength of the steel are improved by optimally adjusting the annealing process, so that the steel has good reworkability in the processing and manufacturing process.

Optimized design of processing technological parameters for leveling and rewinding steel for oil drum

After the flat elongation of the steel for the oil drum is designed and determined, the yield platform of the steel plate after recrystallization annealing is eliminated mainly by adopting 4 percent of reduction, the straightness is improved, discontinuous plastic deformation is eliminated, and a uniform and consistent surface is obtained. The quality precision and the thickness precision of the surface of the steel are improved by controlling proper tension and oil coating quantity, and the technological parameters of the steel, such as the flat elongation, the rewinding straightening tension, the oil coating quantity and the head-tail out-of-tolerance length, are reasonably controlled by the team of the invention through analysis and a large number of tests, so that the product yield is improved. The flat elongation is adjusted to 1.3% +/-0.1 on the premise of unchanged performance, and compared with the conventional elongation process, the yield ratio is (1.4-1.64), the elongation after fracture is (47-54), the yield strength is (200-. The invention team finds that slight double-side waves exist in the steel after being flattened through visual inspection, the effect is not obvious after the steel is rewound, the tension of the withdrawal and the correction is increased to 3500 plus 4000KN, the double-side waves which are not obvious and visible are not generated when the strip steel is observed manually, and the strip steel is very straight. By changing an oil coating control mode, the head part of the strip steel is not coated with oil after the strip steel is divided into the front part and the rear part, the head part of the strip steel is automatically coated with oil, the size of the oil coating is controlled according to 0.7 g/square meter, and the middle part is controlled according to 0.6 g/square meter, so that the control precision of the surface oil coating of the strip steel is greatly improved. And cutting off the head-tail out-of-tolerance length part to ensure that the thickness of the strip steel is within a control range and meet the thickness requirement, controlling the edge part according to 1.15-1.18mm and the middle part according to 1.16-1.18mm, and cutting 0.5 ton more than the head-tail out-of-tolerance in the early stage, thereby improving the thickness precision control by 0.1 mm.

The invention has the following effects:

1. the design of the parameters of the novel process system brings the most remarkable achievement that the structure and the performance of the steel for the oil drum are obviously improved and optimized, and the quality of the steel for the oil drum is improved. The steel for the oil drum produced by the new process system has uniform internal structure and stable performance, the using reject ratio is reduced to be within 4 percent from the original 40 percent, and through the application of the invention, the number of the steel for the oil drum is reduced from 40-90 to 5-20 without demoulding; the untight edge coverage is reduced from 60% to below 5%.

2. Through the design of the parameters of the novel process system, regular customer visits are made, the processing performance of the steel for the oil drum is greatly improved, and the performance use qualification rate of the steel for the oil drum is 100 percent through the performance experimental analysis of the steel plate.

3. The new process system parameter design of the invention improves the qualification rate of the steel for the Hejiang oil drum industry, reduces the complaint degree of users and reduces the odds rate of quality dissatisfaction;

4. the new process system is applied to actual production, the product reject ratio is reduced, the product quality loss is reduced, and the quality loss cost is reduced from the cost perspective; considering from the contract exchange rate, the contract exchange rate is realized, the phenomenon of contract losing or delay is avoided, the credit degree of a client to a production party is improved, and the honesty degree of a production unit is also improved.

Detailed Description

A process for improving the workability of steel for the barrel industry, comprising: 1. the optimized design of the annealing temperature of the steel is that the annealing temperature is less than or equal to 750 ℃, the temperature is detected through a furnace platform thermocouple, the overtemperature is less than 10 ℃, the furnace temperature is not more than 850 ℃, the temperature is detected through the furnace platform thermocouple, the overtemperature is less than 20 ℃, and the cooling temperature is started: the surface of the inner cover is 200 ℃, the coiling core temperature is 380 ℃, the cooling time is 3 hours, the tapping temperature is 160 ℃, and the temperature of the inner cover to the temperature of the leveler is not lower than 40 ℃; 2. a: and (3) optimizing design of the leveling elongation: the leveling elongation is adjusted to be 1.3 +/-0.1, the yield ratio is 1.4-1.64, the elongation after fracture is 47-54, the yield strength is 200-; b. increasing the tension to 3800 KN; c. by changing an oil coating control mode, the head part of the strip steel is not coated with oil after the strip steel is divided in the early stage instead of being coated with oil after the strip steel is divided in the prior stage, the head part of the strip steel is automatically coated with oil, the size of the oil is coated, the head and the tail are controlled according to 0.7 g/square meter, and the middle part is controlled according to 0.6 g/square meter; d. and cutting off the head-tail out-of-tolerance length part to ensure that the thickness of the strip steel is within a control range and meet the thickness requirement, wherein the edge part is controlled according to 1.15-1.18mm, and the middle part is controlled according to 1.16-1.18 mm.