阅读说明：本技术 一种宽幅n06625镍基合金钢板的生产工艺 (Production process of wide N06625 nickel-based alloy steel plate ) 是由 靳淑静 顾丽 党军 李东晖 于 2021-01-04 设计创作，主要内容包括：本发明公开了一种宽幅N06625镍基合金钢板的生产工艺,涉及钢铁生产技术领域,包括以下步骤：坯料准备：坯料厚度要求在113～140mm之间,宽度在1500mm以上,长度在2550mm以上；加热：将钢坯送至步进式加热炉加热,加热总时间按钢坯厚度以16～22min/cm控制,均热段温度1200～1240℃,均热段时间至少30min,出钢温度控制在1220～1240℃；轧制：采用12+1道次,进行全横轧,压下率在第1～3道次为11%～19%,第4～8道次保持在19%,第9道次后逐渐降低,至第12道次时降低至10%,轧后不浇水。可生产出成品宽度不小于2500mm的N06625钢板,板形、精度达到国外同等水平。(The invention discloses a production process of a wide N06625 nickel-based alloy steel plate, which relates to the technical field of steel production and comprises the following steps: preparing a blank: the thickness of the blank is required to be 113-140 mm, the width is more than 1500mm, and the length is more than 2550 mm; 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 16-22 min/cm, the temperature of a soaking section is 1200-1240 ℃, the time of the soaking section is at least 30min, and the tapping temperature is controlled at 1220-1240 ℃; rolling: and (3) carrying out full-transverse rolling by adopting 12+1 passes, wherein the reduction rate is 11-19% in the 1 st-3 rd pass, the reduction rate is kept at 19% in the 4 th-8 th pass, the reduction rate is gradually reduced after the 9 th pass and is reduced to 10% in the 12 th pass, and watering is not carried out after rolling. The N06625 steel plate with the finished width not less than 2500mm can be produced, and the plate shape and the precision reach the same foreign level.)

1. A production process of a wide N06625 nickel-based alloy steel plate is characterized by comprising the following steps of: the method comprises the following steps:

preparing a blank: the thickness of the blank is required to be 113-140 mm, the width is more than 1500mm, and the length is more than 2550 mm;

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 16-22 min/cm, the temperature of a soaking section is 1200-1240 ℃, the time of the soaking section is at least 30min, and the tapping temperature is controlled at 1220-1240 ℃;

rolling: and (3) carrying out full-transverse rolling by adopting 12+1 passes, wherein the reduction rate is 11-19% in the 1 st-3 rd pass, the reduction rate is kept at 19% in the 4 th-8 th pass, the reduction rate is gradually reduced after the 9 th pass and is reduced to 10% in the 12 th pass, and watering is not carried out after rolling.

2. The process for producing a wide N06625 nickel-base alloy steel sheet as claimed in claim 1, wherein the process comprises the following steps: the thickness range of the finished product is 12-20 mm, and the width of the finished product is more than 2500 mm.

3. The process for producing a wide N06625 nickel-base alloy steel sheet as claimed in claim 1, wherein the process comprises the following steps: the rolling process does not remove scale.

4. The process for producing a wide N06625 nickel-base alloy steel sheet as claimed in claim 1, wherein the process comprises the following steps: the rolling process adopts fast-speed steel rolling, and the rolling speed is more than 1.5 m/s.

5. The process for producing a wide N06625 nickel-base alloy steel sheet as claimed in claim 1, wherein the process comprises the following steps: in the rolling process, the steel throwing distance and the inter-pass interval are reduced as much as possible.

6. The process for producing a wide N06625 nickel-base alloy steel sheet as claimed in claim 1, wherein the process comprises the following steps: the equipment adopted by the rolling is a 4700mm four-roller reversible rolling mill.

Technical Field

The invention relates to the technical field of steel production, in particular to a production process of a wide N06625 nickel-based alloy steel plate.

Background

The N06625 nickel-based alloy has excellent high-temperature strength, processability and corrosion resistance, and is widely applied to the fields of chemical industry, nuclear power plants, marine equipment, aircraft materials, heat treatment furnace materials, evaporators and the like. At present, high-quality N06625 alloy is difficult to smelt in China, and most of the high-quality N06625 alloy only depends on import. In addition, since the Ni content of the N06625 alloy is 58% or more, the alloy is expensive, and thus, the N06625 sheet is relatively inexperienced in producing the N06625 sheet in China.

The N06625 nickel-based alloy has high deformation resistance at high temperature, can reach 200 MPa even at 1200 ℃, has high rolling difficulty, and increases the production difficulty along with the increase of the width of a product. At present, the width of the nickel-based alloy plate N06625 on the market is mostly below 2000mm, and the maximum width can reach 2500mm, but the nickel-based alloy plate needs to be imported and has a delivery time as long as 6 months.

Disclosure of Invention

Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a production process of a wide N06625 nickel-based alloy steel plate, which comprises the following steps:

preparing a blank: the thickness of the blank is required to be 113-140 mm, the width is more than 1500mm, and the length is more than 2550 mm;

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 16-22 min/cm, the temperature of a soaking section is 1200-1240 ℃, the time of the soaking section is at least 30min, and the tapping temperature is controlled at 1220-1240 ℃;

rolling: and (3) carrying out full-transverse rolling by adopting 12+1 passes, wherein the reduction rate is 11-19% in the 1 st-3 rd pass, the reduction rate is kept at 19% in the 4 th-8 th pass, the reduction rate is gradually reduced after the 9 th pass and is reduced to 10% in the 12 th pass, and watering is not carried out after rolling.

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

according to the production process of the wide N06625 nickel-based alloy steel plate, the thickness range of a finished product is 12-20 mm, and the width of the finished product is more than 2500 mm.

The production process of the wide N06625 nickel-based alloy steel plate has no scale removal in the rolling process.

The production process of the wide N06625 nickel-based alloy steel plate comprises the rolling process of adopting fast-speed steel rolling, wherein the rolling speed is more than 1.5 m/s.

The production process of the wide N06625 nickel-based alloy steel plate comprises the step of rolling, wherein the steel throwing distance and the inter-pass interval are reduced as much as possible.

In the production process of the wide N06625 nickel-based alloy steel plate, the rolling equipment is a 4700mm four-roller reversible rolling mill.

The invention has the beneficial effects that: the nickel-based alloy N06625 has high heat deformation resistance, so the production difficulty is high. The invention uses 4700mm four-roller reversible mill, the maximum rolling force can reach 120000 kN, and simultaneously, the invention is provided with a CVC device, and the shape can be accurately controlled. Because the temperature is reduced and a larger rolling force is needed, in order to reduce the temperature drop in the rolling process, the blank length can be subjected to full-transverse rolling when the blank specification is designed, the steel plate does not need to turn, meanwhile, the surface oxide scale of the nickel-based alloy is extremely little, the scaling and the closing and purging are not needed in the rolling process, and the fast-speed steel rolling is adopted. The rolling schedule is reasonably designed, and the warping of the steel plate is reduced. The width of the produced product is not less than 2500mm and is 2000mm higher than the main stream width in the market, so that the number of welding seams of the product in use can be reduced, the cost is reduced, the safety is improved, and the service life is prolonged.

Detailed Description

The embodiment provides a production process of a wide N06625 nickel-based alloy steel plate, which selects an N06625 steel type with the blank size of 120mm multiplied by 1579mm multiplied by 2649mm, and comprises the following chemical components in percentage by weight: c: 0.016%, Mn: 0.121%, Cr: 20.87%, Mo: 8.02%, Co: 0.035%, W: 0.195%, Fe: 4.22 percent, and the balance being Ni. The length of the blank meets the requirements of full cross rolling, and the steel turning time and the head warping risk are reduced. The planned rolling finished product size is 12.5mm × 2550mm × 7000mm, and the production process specifically comprises the following steps:

and (3) after the appearance size of the blank is inspected to be qualified, the blank is sent into a stepping heating furnace to be heated, the furnace time is 207min, the soaking section temperature is 1227-1235 ℃, the soaking time is 40min, and the tapping temperature is 1230 ℃. In order to reduce the temperature drop, the high-pressure water tank does not descale, and the high-pressure water tank does not descale in the rolling process, but the purging is started. The rolling is carried out by adopting a full transverse rolling mode and using a 4700mm four-roller reversible rolling mill, the finishing rolling temperature is 903 ℃, and watering is not carried out after rolling. The rolling process is carried out for 12+1 passes, wherein the reduction rate of the 1 st pass is 12.9%, the reduction rate of the 2 nd pass is 15.3%, the reduction rate of the 3 rd pass is 18%, the reduction rates of the 4 th to 8 th passes are 19-22%, the reduction rate of the 9 th pass is 17.2%, the reduction rates of the 10 th to 11 th passes are 13-14%, and the reduction rate of the 12 th pass is 11.3%. The rolling speed in the whole process is 1.5-4.5 m/s. Straightening is carried out after rolling, and the steel is put off line in sections, so that the effective size of the steel is 12.71mm multiplied by 2600mm multiplied by 7130 mm.

Therefore, the N06625 steel plate with the thickness of more than or equal to 12mm and the width of about 2500mm is produced, and has good plate shape and obvious specification advantages.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.