阅读说明：本技术 一种宽幅薄规格6Mo超级奥氏体不锈钢板的轧制方法 (Rolling method of wide and thin 6Mo super austenitic stainless steel plate ) 是由 靳淑静 党军 曾周燏 李东晖 于 2019-10-15 设计创作，主要内容包括：本发明公开了一种宽幅薄规格6Mo超级奥氏体不锈钢板的轧制方法,包括以下步骤：坯料厚度110mm～125mm,宽度1500mm以上,长度2550mm～2620mm；钢坯送至步进式加热炉,加热总时间按钢坯厚度以15～22min/cm控制,均热段温度1230～1270℃,均热段时间至少30min,出钢温度1240℃～1260℃；采用12+1道次,进行全横轧,压下率从第1道次的17%增加至第5道次的30%～40%,后逐渐减小,第11道次的压下率7%～9%,第12道次的压下率4%～6%,轧后空冷；固溶温度1160℃,保温20min,水冷。可使此类产品的成品宽度从现有技术的2000mm扩宽到2500mm。(The invention discloses a rolling method of a wide and thin 6Mo super austenitic stainless steel plate, which comprises the following steps: the thickness of the blank is 110 mm-125 mm, the width is more than 1500mm, and the length is 2550 mm-2620 mm; the steel billet is sent to a stepping heating furnace, the total heating time is controlled according to the thickness of the steel billet at 15-22 min/cm, the temperature of a soaking section is 1230-1270 ℃, the time of the soaking section is at least 30min, and the tapping temperature is 1240-1260 ℃; carrying out full-transverse rolling by adopting 12+1 passes, increasing the reduction rate from 17% of the 1 st pass to 30% -40% of the 5 th pass, then gradually reducing, and carrying out air cooling after rolling, wherein the reduction rate of the 11 th pass is 7% -9%, and the reduction rate of the 12 th pass is 4% -6%; the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out. The finished width of such products can be widened from 2000mm to 2500mm in the prior art.)

1. A rolling method of a wide and thin 6Mo super austenitic stainless steel plate is characterized by comprising the following steps:

preparing a blank: the thickness of the blank is required to be 110 mm-125 mm, the width is more than 1500mm, the length is 2550 mm-2620 mm, and the length of the blank meets the requirements of full cross rolling;

heating: the steel billet is sent to a stepping heating furnace to be heated, the total heating time is controlled according to the thickness of the steel billet at 15-22 min/cm, the temperature of a soaking section is 1230-1270 ℃, the time of the soaking section is at least 30min, and the tapping temperature is controlled at 1240-1260 ℃;

rolling: carrying out full-transverse rolling by adopting 12+1 passes, gradually increasing the reduction rate from 17% of the 1 st pass to 30% -40% of the 5 th pass, then gradually reducing the reduction rate, wherein the reduction rate of the 11 th pass is 7% -9%, the reduction rate of the 12 th pass is 4% -6%, and air cooling is carried out without watering after rolling;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

2. The rolling method of a wide and thin gauge 6Mo super austenitic stainless steel plate according to claim 1, characterized in that: the steel grade is 6Mo super austenitic stainless steel, the thickness range of a finished product is 8-10 mm, and the width range of the finished product is 2400-2500 mm.

3. The rolling method of a wide and thin gauge 6Mo super austenitic stainless steel plate according to claim 1, characterized in that: the rolling equipment is a 4700mm four-roller reversible rolling mill.

4. The rolling method of a wide and thin gauge 6Mo super austenitic stainless steel plate according to claim 1, characterized in that: the whole production process does not remove scale.

5. The rolling method of a wide and thin gauge 6Mo super austenitic stainless steel plate according to claim 1, characterized in that: and in the rolling process, fast-speed steel rolling is adopted, and the rolling speed is 1.5-2 m/s.

6. The rolling method of a wide and thin gauge 6Mo super austenitic stainless steel plate according to claim 1, characterized in that: in the rolling process, the steel throwing distance and the inter-pass interval are reduced as much as possible.

7. The rolling method of a wide and thin gauge 6Mo super austenitic stainless steel plate according to claim 1, characterized by comprising the following steps:

preparing a blank: the blank has the thickness of 115mm, the width of 1600mm and the length of 2610 mm;

heating: the steel billet is sent to a stepping heating furnace to be heated, the total heating time is 235min, the temperature of a soaking section is 1253-1265 ℃, the time of the soaking section is 43min, and the tapping temperature is controlled at 1258 ℃;

rolling: carrying out full-transverse rolling by adopting a 12+ 1-pass 4700mm four-roller reversible rolling mill, wherein the rolling process is free from scale removal, the rolling speed is 1.5-2 m/s, the 1 st pass reduction rate is 17%, then the 1 st pass reduction rate is gradually increased to 35% of the 5 th pass reduction rate, then the 1 st pass reduction rate is gradually reduced until the 11 th pass reduction rate is 8%, the 12 th pass reduction rate is 5.4%, and the rolling process is air-cooled and is not watered;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

8. The rolling method of a wide and thin gauge 6Mo super austenitic stainless steel plate according to claim 1, characterized by comprising the following steps:

preparing a blank: the thickness of the blank is 120mm, the width is 1650mm, and the length is 2620 mm;

heating: conveying the steel billet to a stepping heating furnace for heating, wherein the total heating time is 252min, the temperature of a soaking section is 1258-1270 ℃, the time of the soaking section is 50min, and the tapping temperature is controlled at 1256 ℃;

rolling: carrying out full-transverse rolling by adopting a 12+ 1-pass 4700mm four-roller reversible rolling mill, wherein the rolling process is free from scale removal, the rolling speed is 1.5-2 m/s, the 1 st pass reduction rate is 17%, then the 1 st pass reduction rate is gradually increased to the 5 th pass reduction rate of 38%, then the 1 st pass reduction rate is gradually reduced until the 11 th pass reduction rate is 8%, the 12 th pass reduction rate is 5.2%, and the rolling process is air-cooled and is not watered;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

9. The rolling method of a wide and thin gauge 6Mo super austenitic stainless steel plate according to claim 1, characterized by comprising the following steps:

preparing a blank: the thickness of the blank is 125mm, the width is 1700mm, and the length is 2600 mm;

heating: the steel billet is sent to a stepping heating furnace to be heated, the total heating time is 237.5min, the temperature of a soaking section is 1251-1263 ℃, the time of the soaking section is 50min, and the tapping temperature is controlled at 1256 ℃;

rolling: carrying out full-transverse rolling by adopting a 12+ 1-pass 4700mm four-roller reversible rolling mill, wherein the rolling process is free from scale removal, the rolling speed is 1.5-2 m/s, the 1 st pass reduction rate is 17%, then the 1 st pass reduction rate is gradually increased to 35% of the 5 th pass reduction rate, then the 1 st pass reduction rate is gradually reduced until the 11 th pass reduction rate is 9%, the 12 th pass reduction rate is 5.6%, and air cooling and watering are not carried out after rolling;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

Technical Field

The invention relates to the technical field of stainless steel rolling, in particular to a rolling method of a wide and thin 6Mo super austenitic stainless steel plate.

Background

Because the service environment of materials in the fields of petroleum, chemical industry, electric power, military industry, ocean development and the like is extremely harsh, the traditional stainless steel cannot meet the use requirements of special industries and special function fields. The 6Mo super austenitic stainless steel has higher pitting corrosion resistance equivalent, can keep good corrosion resistance in severe environment, and is widely applied to the fields of flue gas desulfurization devices, chemical equipment, plate heat exchangers and the like. In recent years, with the limit of the content of sulfur oxides in ship exhaust gas by the international maritime convention, the demand of ship flue gas desulfurization devices is increased rapidly, and the market demand for 6Mo steel such as thin gauge N08367, S31254 and the like is also driven.

The wider such products, the fewer the number of welds, the more cost effective and the greater the safety. However, such stainless steel has high strength at high temperature, high deformation resistance and high rolling difficulty, so that it is difficult to make the stainless steel thin and wide and has good plate shape. Currently, the production of thin gauge 6Mo steel is usually performed by hot continuous rolling, but this also limits the width of the finished product. The main stream width of the 6Mo stainless steel plate with thin specification (less than 10 mm) on the market is less than 2m, and only a few foreign steel companies can achieve 2.4 m.

Disclosure of Invention

In order to solve the technical problems, the invention provides a rolling method of a wide and thin 6Mo super austenitic stainless steel plate, which comprises the following steps:

preparing a blank: the thickness of the blank is required to be 110 mm-125 mm, the width is more than 1500mm, the length is 2550 mm-2620 mm, and the length of the blank meets the requirements of full cross rolling;

heating: the steel billet is sent to a stepping heating furnace to be heated, the total heating time is controlled according to the thickness of the steel billet at 15-22 min/cm, the temperature of a soaking section is 1230-1270 ℃, the time of the soaking section is at least 30min, and the tapping temperature is controlled at 1240-1260 ℃;

rolling: the whole production process does not remove scale, 12+1 passes are adopted to carry out full transverse rolling, the reduction rate is gradually increased from 17 percent of the 1 st pass to 30-40 percent of the 5 th pass and then is gradually reduced, the reduction rate of the 11 th pass is 7-9 percent, the reduction rate of the 12 th pass is 4-6 percent, and air cooling and no watering are carried out after rolling;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

The technical scheme of the invention is further defined as follows:

in the rolling method of the wide and thin 6Mo super austenitic stainless steel plate, the steel type is 6Mo super austenitic stainless steel, the thickness range of a finished product is 8 mm-10 mm, and the width range of the finished product is 2400 mm-2500 mm.

The rolling equipment of the rolling method of the wide and thin 6Mo super austenitic stainless steel plate is a 4700mm four-roller reversible rolling mill.

The rolling method of the wide and thin 6Mo super austenitic stainless steel plate has no scale removal in the whole production process.

The rolling method of the wide and thin 6Mo super austenitic stainless steel plate comprises the steps of adopting fast-speed steel rolling in the rolling process, wherein the rolling speed is 1.5-2 m/s.

According to the rolling method of the wide and thin 6Mo super austenitic stainless steel plate, the steel throwing distance and the inter-pass interval are reduced as much as possible in the rolling process.

The rolling method of the wide and thin 6Mo super austenitic stainless steel plate comprises the following steps:

preparing a blank: the blank has the thickness of 115mm, the width of 1600mm and the length of 2610 mm;

heating: the steel billet is sent to a stepping heating furnace to be heated, the total heating time is 235min, the temperature of a soaking section is 1253-1265 ℃, the time of the soaking section is 43min, and the tapping temperature is controlled at 1258 ℃;

rolling: carrying out full-transverse rolling by adopting a 12+ 1-pass 4700mm four-roller reversible rolling mill, wherein the rolling process is free from scale removal, the rolling speed is 1.5-2 m/s, the 1 st pass reduction rate is 17%, then the 1 st pass reduction rate is gradually increased to 35% of the 5 th pass reduction rate, then the 1 st pass reduction rate is gradually reduced until the 11 th pass reduction rate is 8%, the 12 th pass reduction rate is 5.4%, and the rolling process is air-cooled and is not watered;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

The rolling method of the wide and thin 6Mo super austenitic stainless steel plate comprises the following steps:

preparing a blank: the thickness of the blank is 120mm, the width is 1650mm, and the length is 2620 mm;

heating: conveying the steel billet to a stepping heating furnace for heating, wherein the total heating time is 252min, the temperature of a soaking section is 1258-1270 ℃, the time of the soaking section is 50min, and the tapping temperature is controlled at 1256 ℃;

rolling: carrying out full-transverse rolling by adopting a 12+ 1-pass 4700mm four-roller reversible rolling mill, wherein the rolling process is free from scale removal, the rolling speed is 1.5-2 m/s, the 1 st pass reduction rate is 17%, then the 1 st pass reduction rate is gradually increased to the 5 th pass reduction rate of 38%, then the 1 st pass reduction rate is gradually reduced until the 11 th pass reduction rate is 8%, the 12 th pass reduction rate is 5.2%, and the rolling process is air-cooled and is not watered;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

The rolling method of the wide and thin 6Mo super austenitic stainless steel plate comprises the following steps:

preparing a blank: the thickness of the blank is 125mm, the width is 1700mm, and the length is 2600 mm;

heating: the steel billet is sent to a stepping heating furnace to be heated, the total heating time is 237.5min, the temperature of a soaking section is 1251-1263 ℃, the time of the soaking section is 50min, and the tapping temperature is controlled at 1256 ℃;

rolling: carrying out full-transverse rolling by adopting a 12+ 1-pass 4700mm four-roller reversible rolling mill, wherein the rolling process is free from scale removal, the rolling speed is 1.5-2 m/s, the 1 st pass reduction rate is 17%, then the 1 st pass reduction rate is gradually increased to 35% of the 5 th pass reduction rate, then the 1 st pass reduction rate is gradually reduced until the 11 th pass reduction rate is 9%, the 12 th pass reduction rate is 5.6%, and air cooling and watering are not carried out after rolling;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

The invention has the beneficial effects that:

(1) the invention provides a rolling scheme of a wide and thin 6Mo super austenitic stainless steel by using a medium plate mill, and the 6Mo super austenitic stainless steel with the thickness range of 8-10 mm and the width range of 2400-2500 mm can be produced by adopting the rolling method, so that the width of the finished product of the product can be widened from 2000mm to 2500mm in the prior art;

(2) the invention can reduce the number of welding lines when the product is used, reduce the cost, increase the safety and prolong the service life;

(3) the product prepared by the method has high production difficulty and high added value, so that high economic benefit can be created;

(4) the invention saves rolling time and reduces temperature drop by various modes, if the length of the blank can be rolled completely, the steel plate does not need to turn; the surface of the stainless steel has little oxide skin, and no scale is produced in the rolling process; adopting fast-speed steel rolling and the like; meanwhile, the design of the rolling pass reduction rate can ensure the thickness precision and the plate shape to the maximum extent through multiple times of simulation verification.

Detailed Description

A rolling method of a wide and thin 6Mo super austenitic stainless steel plate comprises the following steps:

preparing a blank: the thickness of the blank is required to be 110 mm-125 mm, the width is more than 1500mm, the length is 2550 mm-2620 mm, and the length of the blank meets the requirements of full cross rolling;

heating: the steel billet is sent to a stepping heating furnace to be heated, the total heating time is controlled according to the thickness of the steel billet at 15-22 min/cm, the temperature of a soaking section is 1230-1270 ℃, the time of the soaking section is at least 30min, and the tapping temperature is controlled at 1240-1260 ℃;

rolling: the whole production process does not remove scale, 12+1 passes are adopted, a 4700mm four-roller reversible rolling mill is adopted for full transverse rolling, the reduction rate is gradually increased from 17 percent of the 1 st pass to 30 to 40 percent of the 5 th pass and then gradually reduced, the reduction rate of the 11 th pass is 7 to 9 percent, the reduction rate of the 12 th pass is 4 to 6 percent, the fast-speed steel rolling is adopted, and the steel is cooled in air and is not watered;

and (3) heat treatment: the solid solution temperature is 1160 ℃, the temperature is kept for 20min, and the water cooling is carried out.

The thickness range of the finished product is 8 mm-10 mm, and the width range of the finished product is 2400 mm-2500 mm.