RU54947U1 - PRODUCT FROM STRUCTURAL HIGH STRENGTH STEEL (OPTIONS) - Google Patents

Abstract

The utility model relates to ferrous metallurgy, namely to extended products from structural high-strength steel, which are intended for the manufacture of highly loaded parts working for torsion and bending under dynamic load, in particular, shafts for submersible pumps, electric motors, for gas separators used in the gas and oil industry . New in the product from structural high-strength steel of predominantly cylindrical extended form containing carbon, silicon manganese, chromium, nickel and molybdenum is that it is made of steel with components in the following proportions, in wt.%:

carbon 0.15 ÷ 0.45, sulfur up to 0.05, phosphorus up to 0.05, silicon 0.2 ÷ 1.0 manganese 0.2 ÷ 2.0 chromium 0.1 ÷ 2.0 nickel 0.1 ÷ 5.0 molybdenum + 3 tungsten 0.01 ÷ 0.9, iron and impurities the rest, subject to the following ratio: Ni + 1.2 · Cr + 1.5 · Mn≤9-0.6 · C, according to the second embodiment, the product is also manufactured, at least using the operation of hot deformation and depending on the content nickel is cooled from the temperature of the end of such a deformation, exceeding the critical temperature A _cl , at a speed of V≥0.37 + 1.45 / Ni, where V is the workpiece cooling rate, in ° C / s. The technical result is a product made of structural high-strength steel of predominantly cylindrical elongated shape, intended for the manufacture of highly loaded parts working for torsion and bending under dynamic load, with improved plastic properties, especially impact strength at high strength due to the homogeneous structure of the steel at an economical expense

alloying components, as well as in the case of increased requirements for the properties of steel due to optimal heat treatment conditions. 2 n.p. f-ly, 23 z.p. f-ly. twenty

Description

The utility model relates to ferrous metallurgy, namely to extended products from structural high-strength steel, which are intended for the manufacture of highly loaded parts working for torsion and bending under dynamic load, in particular, shafts for submersible pumps, electric motors, for gas separators used in the gas and oil industry .

Known air hardened steel with a low nickel content. Steel has the following composition, in wt.%:

carbon - 0.18-0.35, silicon - 1.3-1.75, manganese - 1.3-2.0, chromium - 0.65-2.1, nickel - 0.9-2.0, molybdenum - 0.2-0.35, iron - the rest. (see US No. 5094923 A, 03/10/1992)

The disadvantage of this steel composition is the lack of strength and toughness for the manufacture of highly loaded parts working on torsion and bending under dynamic load, in particular shafts.

High-strength steel of high hardness, a steel product and method of its application are also known from the prior art. Steel has the following composition, in wt.%:

carbon - 0.075-0.15, silicon - up to 1.0, manganese - 1.0-3.0, chromium - 2.0-5.0, nickel - 1.0-4.0,

with a minimum total content of manganese, chromium, nickel 6 wt.%, molybdenum 0.1-1.0, which can be replaced by a double amount of tungsten,

phosphorus - up to 0.015, sulfur - up to 0.02, iron - the rest.

(see EP 0909338 A1, 04/21/1999)

The disadvantage of this steel composition is the insufficient toughness for the manufacture of highly loaded parts working for torsion and bending under dynamic load, in particular shafts, as well as the non-optimal consumption of expensive alloying components.

Known steel, in order to save Nickel in which the composition of structural and stamped chromium-nickel-molybdenum steels containing 0.35-0.45% carbon, carbon may be included in large or smaller quantities, depending on the purpose of the steel. Steel also contains 0.17-0.37% silicon, 0.65-0.95% manganese, 0.75-1.05% chromium, 0.60-0.90% nickel and 0.15-0.25 % molybdenum (see SU 75320, 05/31/1949)

The disadvantage of this steel composition is the insufficient toughness for the manufacture of highly loaded parts working for torsion and bending under dynamic load, in particular shafts, as well as the possible unevenness of the steel structure due to insufficient uniformity of the steel structure.

Various steel products are known, for example, stainless steel with high strength and ductility, which is used in the manufacture of cold-rolled tape, strip, sheet, high-strength wire and ropes, springs, medical instruments, cutting tools, fasteners, structural parts, etc. A high-strength corrosion-resistant product is made of steel with the following composition of components, wt.%: Carbon 0.15-0.45, chromium 12.0-16.5, nickel 3.0-5.0, iron - the rest, while the carbon content and nickel is in the following dependence: chromium = 25.7- (17.5 ° С18.0) carbon - (1.2 ° С1.4) nickel. (see, for example, RU 2061781 C1, 06/10/1996, 6 C 22 C 38/40).

The problem solved by the invention is the creation of a method of manufacturing a product from structural high-strength steel, as well as a steel product intended for the manufacture of highly loaded parts working for torsion and bending under dynamic load, which has an increased impact

viscosity, uniform structure, as well as optimally economical composition of alloying components.

The problem in part of the first version of the product from structural high-strength steel of predominantly cylindrical extended form containing carbon, silicon manganese, chromium, nickel and molybdenum is solved due to the fact that it is made of steel with components in the following proportions, in wt.%:

carbon 0.15 ÷ 0.45, sulfur up to 0.05, phosphorus up to 0.05, silicon 0.2 ÷ 1.0 manganese 0.2 ÷ 2.0 chromium 0.1 ÷ 2.0 nickel 0.1 ÷ 5.0 molybdenum + 3 tungsten 0.01 ÷ 0.9, iron and impurities the rest, subject to the following ratio: Ni + 1.2 · Cr + 1.5 · Mn≤9-0.6 · C, and the product is made using at least the hot deformation operation and, depending on the nickel content, it is cooled with the temperature of the end of such a deformation, exceeding the critical temperature A _cl , with a speed V≥0.37 + 1.45 / Ni, where V is the cooling rate of the workpieces, in ° C / s.

Before hot deformation, the steel billets can be heated in a heating furnace to a temperature exceeding at least the critical temperature A _cl .

The hot deformation operation can include flashing on a cross-helical rolling mill, as well as rolling hot workpieces on a rolling and / or reduction mill and / or longitudinal rolling mill to produce blanks of especially thick-walled pipes up to 10 m long with a diameter of 25 mm to 50 mm and an inner diameter of the hole from 6.0 mm to 10.0 mm.

After the operation of hot deformation and cooling of the steel billets, they can be additionally heated and maintained at a temperature exceeding at least the critical temperature A _cl , and the billet cooling operation

carried out after such additional heating. Moreover, additional heating of products with subsequent cooling can be carried out separately, for example, in another process.

The workpieces can be cooled in air, for example, in a rack refrigerator or using additional devices, for example, in an environment with increased cooling capacity.

After cooling the workpieces, they can be subjected to softening heat treatment by heating the workpieces to a temperature of (500 ÷ 750) ° C, holding for up to 10 hours, followed by cooling.

The product can be manufactured using the operation of cold reference or fault-free drawing, which is carried out after cooling the workpieces and / or after their softening heat treatment.

Billets may be subject to finish heat treatment and / or subject to dressing, turning and / or grinding of the surface.

Steel can be used with an additional content of at least one of the elements: niobium, vanadium, titanium, tantalum, calcium, barium in the range of 0.005 ÷ 1.0 wt.%.

Steel with an additional copper content in the amount of (0.01 ÷ 1.5) wt.% Can be used.

Steel can be used with at least one of the following additional components: cerium, rare earth metals, zirconium, yttrium, magnesium, arsenic, selenium, and each additional component is used in an amount of (0.001 ÷ 0.1) wt.%.

Steel with an additional lanthanum content in an amount of (0.005 ÷ 0.02) wt.% And / or cobalt in an amount of not more than 1.0 wt.% Can be used.

The product can be made at least from one end with the formation of slots for subsequent connection, for example, with the shaft of a submersible pump.

The slots can be made straight or involute execution by cutting and / or plastic deformation.

The product may have a deviation from straightness of not more than 0.4 mm per linear meter of length.

The surface roughness of the product R _a can be no more than 2.5 μm at a base length of 0.8 mm.

The problem in part of the second version of the product from structural high-strength steel, mainly cylindrical, extended, containing carbon, silicon manganese, chromium, nickel and molybdenum is solved due to the fact that it is made of steel with components in the following proportions, in wt.%:

carbon 0.15 ÷ 0.45, silicon 0.2 ÷ 1.0, manganese 0.2 ÷ 2.0 chromium 0.1 ÷ 2.0 nickel 0.1 ÷ 5.0 molybdenum + 3 tungsten 0.01 ÷ 0.9, iron and impurities the rest, subject to the following ratio: Ni + 1.2 · Cr + 1.5 · Mn≤9-0.6 · C.

Steel can be used with an additional content of at least one of the elements: niobium, vanadium, titanium, tantalum, calcium, barium in the range of 0.005 ÷ 1.0 wt.%.

Steel with an additional copper content in the amount of (0.01 ÷ 1.5) wt.% Can be used.

Steel can be used with at least one of the following additional components: cerium, rare earth metals, zirconium, yttrium, magnesium, arsenic, selenium, and each additional component is used in an amount of (0.001 ÷ 0.1) wt.%.

Steel with an additional lanthanum content in an amount of (0.005 ÷ 0.02) wt.% And / or cobalt in an amount of not more than 1.0 wt.% Can be used.

The product can be made in the form of a predominantly cylindrical hollow shaft up to 10 m long.

The product can be made at least from one end with the formation of slots for subsequent connection, for example, with the shaft of a submersible pump.

The slots can be made straight or involute execution by cutting and / or plastic deformation.

The product may have a deviation from straightness of not more than 0.4 mm per linear meter of length, and the surface roughness R _a not more than 2.5 μm at a base length of 0.8 mm.

The technical result is to obtain products from structural high-strength steel, mainly cylindrical in length, designed for the manufacture of highly loaded parts working for torsion and bending under dynamic load, with improved plastic properties, especially impact strength at high strength due to the homogeneous structure of the steel at an economical consumption of alloying components. In the case of increased requirements for the properties of steel, especially toughness, such properties are achieved due to optimal heat treatment conditions.

Thus, the carbon content is typical for structural steel compositions used for the manufacture of high-strength products used in difficult conditions under load. The carbon content from 0.15 to 0.45 wt.% Classifies steel in the ferrite-pearlite class. The properties of this class of steel are widely corrected by the addition of alloying additives, since plastic ferrite occupies a significant part in the steel, and hard cementite in solution with ferrite occupies the other part. If the carbon content is less than 0.15 wt.%, To give the product high strength and hardness, a large number of expensive alloying components will be required, in the other case, when the carbon content in the steel composition is more than 0.45 wt.%, The toughness is uncorrected even by a significant alloying content additives aimed at increasing toughness, for example, such as nickel.

Manganese and silicon in the range from 0.2 wt.% To 1.0 wt.% Each are used as technological additives for the deoxidation of steel, and manganese in the range from 0.2 wt.% To 2.0 wt.% Is used not only for deoxidation, but also for improving the physical properties of steel, such as toughness and hardness. When the manganese content of more than 2.0 wt.% Unacceptably reduced toughness.

Sulfur and phosphorus as harmful impurities within the specified limits do not adversely affect the ductility of steel. In large doses, they reduce the ductility of steel, for example, sulfur can cause red brittleness of steel, and phosphorus the effect of cold brittleness.

Molybdenum and tungsten are introduced into steel within the specified limits in order to increase corrosion resistance, increase hardness, and also to prevent tempering brittleness of the 2nd kind, which is observed during slow cooling of steel during heat treatment at temperatures of about 500 ° C.

In this sense, the effect of molybdenum and tungsten is equivalent. However, the introduction of molybdenum and tungsten affects the toughness and a molybdenum content of + 3 * tungsten of more than 0.9 wt.% Significantly reduces the plastic properties of steel, primarily impact strength.

Tungsten, due to the larger size of the atom, introduces a greater distortion into the crystal lattice of iron compared with molybdenum. This allows you to increase the strength properties of steel and from this point of view, the use of tungsten is preferable.

On the other hand, tungsten and molybdenum are expensive elements, and since alloying tungsten steel requires three times more than molybdenum, the use of tungsten for alloying can lead to a significant increase in the cost of steel.

Chrome and nickel within the specified limits along with an increase in the hardness of steel increase the toughness.

Manganese, chromium and nickel in the doses determined in the steel composition separately from each other increase the plastic properties of steel, however, on the upper limit of their content, on the contrary, they reduce toughness. Thus, the calculated regularity Ni + 1.2 · Cr + 1.5 · Mn≤9, which limits the total content of these components in order to achieve maximum toughness as a property of steel playing a special role in products subjected to dynamic loads, was confirmed experimentally. The coefficients of the components characterize the degree of negative impact caused by the plastic properties of steel, the corresponding component at the upper limit of its content.

Additional theoretical studies showed that even in the limit limited by the above ratio, the total content of manganese, chromium and nickel can be reduced depending on the carbon content in steel, since at their upper limit the plastic properties of steel practically do not change, and on an industrial scale, savings of even half a percent Nickel, for example, significantly reduces production costs. Thus, experimental studies yielded a result justifying an additional limitation of the total content of manganese, chromium and nickel depending on the carbon content in steel: Ni + 1.2 · Cr + 1.5 · Mn≤9-0.6 · С, where the coefficient at carbon - empirically selected as a result of additional research.

In the case of increased requirements for the properties of steel, the required level of mechanical properties of the steel product is ensured by the specified heat treatment modes.

The plastic properties of ferritic-pearlitic steel significantly increase the so-called improvement. Typically, this is an operation involving quenching or normalization followed by tempering. As a result, the high plastic properties of the steel are obtained due to the uniform martensitic structure of the steel throughout the product. This is achieved by the specified heat treatment modes. A special role in imparting high plastic characteristics to steel, for example, impact strength, along with the addition of certain alloying additives, is played by the cooling process after quenching-normalization. Depending on the nickel content for the specified steel composition, in order to give the steel a uniform structure, it is necessary to limit the lower limit of the workpiece cooling rate. After experimental study, this limitation was expressed in the inequality V≥0.37 + 1.45 / Ni, where V is the workpiece cooling rate, in ° C / s, and Ni is the nickel content in steel, in wt.%. Using the specified ratio, it is possible to determine the permissible values of the parameters for cooling the workpieces depending on the nickel content in the steel composition.

The cooling rate according to the formula is calculated to cool the workpiece in the range from the temperature of the end of the hot deformation to a temperature of (350 ÷ 450) ° С. There is no need to regulate the cooling rate at lower temperatures, because separation of intermediate structures such as bainite, perlite

will already be prevented. In the event of unexpected cooling of the workpieces after hot deformation with unacceptable cooling rate parameters, additional heating and cooling of the workpieces with cooling rate parameters that have acceptable values is possible.

The proposed dependence of the workpiece cooling rate on the nickel content in steel provides a uniform martensite structure. In this case, the steel acquires high plastic properties and toughness.

At a cooling rate lower than that calculated by the formula, a mixed structure of martensite, bainite, and even perlite will appear in the workpiece. An inhomogeneous structure leads to a decrease in the plastic properties of steel and impact strength, especially after softening heat treatment.

Thus, the proposed product from high strength structural steel, as well as a method of manufacturing products from such steel provide the claimed technical result.

Example No. 1.

Steel is smelted in the main electric arc furnace. The steel was casted into 4.05 t ingots. The ingots were rolled at the BLUMING mill for 200 mm square billets, and then at a large section mill for round billets with a diameter of 60 mm. The billets are heated in an induction furnace and sewn on a cross-helical rolling mill, and then rolled on a rolling mill to produce extra-thick-walled pipes with a diameter of 30 mm, an inner diameter of holes of 8.5 mm and a length of 5400 mm.

Workpieces are subject to softening heat treatment in the following mode:

- heating and holding the blanks at a temperature of 680 ° C for 4 hours, followed by cooling in air.

After dressing, turning and grinding of the surface on the finished products, the mechanical properties were determined.

Testing of mechanical properties was carried out according to GOST 1497-43, impact strength according to GOST 9454-78.

The chemical composition of steel products, smelted with a different content of components, the results of mechanical properties tests are shown in tables 1, 2.

Table 1 The chemical composition of steel Option Chem. structure one 2 3 four 5 6 7 8 9 10 carbon 0.15 0.20 0.15 0.25 0.30 0.30 0.40 0.40 0.45 0.45 sulfur 0,07 0.02 0.01 0.02 0.01 0.02 0.02 0.01 0.02 0.02 phosphorus 0.08 0,03 0.01 0,03 0.02 0.02 0.01 0.01 0,03 0.01 silicon 0.2 0.5 0.2 0.5 0.2 0.5 0.2 0.3 0.6 0.4 manganese 1,5 2.0 1,5 1,0 1,5 1,0 1,0 1,5 1,0 1.8 chromium 2.0 2.0 1,5 1,0 2.0 1,0 1,0 1,5 1,0 1,5 nickel 4.0 5,0 1,0 3.0 4.0 3,5 2.0 4.8 0.2 4.3 Ni + 1.2 · Cr + l, 5 · Mn≤9-0.6 · С + - + + + + + - + - molybdenum + 3 tungsten 0.02 0.2 0.02 0.4 1,5 0.2 0.5 0.5 0.8 0.5

table 2 Mechanical and corrosive properties of steel Option Properties one 2 3 four 5 6 7 8 9 10 Yield strength, kg / mm ² 60 60 70 65 60 70 65 60 65 60 Temporary tensile strength, kg / mm ² 80 85 95 85 80 95 85 80 85 85 Relative extension, % 12 13 eighteen fifteen 12 eighteen fifteen 12 fifteen 13 Relative narrowing,% fifty fifty 60 55 fifty 60 55 fifty 55 fifty Impact strength, J / cm ² 6.0 6.0 8.0 7.0 6.0 8.0 7.0 6.0 7.0 6.0

Options 3, 4, 6, 7, 9 correspond to a utility model. Options 3, 6 are optimal. Option 1 does not satisfy this utility model due to the high content of harmful impurities, namely sulfur and phosphorus. Options 2, 8, 10 do not satisfy this utility model, since it has a total amount of manganese, chromium, and nickel exceeding a given limit. Option 5 does not satisfy this invention, as it has a high content of molybdenum and tungsten.

Example No. 2.

Steel is smelted in the main electric arc furnace. The steel was casted into 4.05 t ingots. The ingots were rolled at the BLUMING mill for 200 mm square billets, and then at a large section mill for round billets with a diameter of 60 mm. The billets are heated in an induction furnace and sewn on a cross-helical rolling mill, and then rolled on a rolling mill to produce extra-thick-walled pipes with a diameter of 30 mm with an inner diameter of holes of 8.5 mm and a length of 5400 mm, then the billets are cooled in a rack refrigerator.

Then the workpieces are additionally heated and maintained at a temperature of 750 ° C, and then cooled after additional heating with a water-air mixture using spraying devices with a cooling rate of V ° C / s.

After cooling, the workpieces were subjected to softening heat treatment in the following mode:

- heating and holding the pipes at a temperature of 680 ° C for 4 hours, followed by cooling in air.

After dressing, turning and grinding of the surface on the finished products, the mechanical properties were determined.

Testing of mechanical properties was carried out according to GOST 1497-43, impact strength according to GOST 9454-78.

The chemical composition of steel products, smelted with a different content of components, the results of mechanical properties and corrosion tests are shown in tables 3, 4.

Table 3 The chemical composition of steel. Option Chem. structure one 2 3 four 5 6 carbon 0.15 0.25 0.30 0.35 0.40 0.45 silicon 0.7 0.5 0.2 0.3 0.4 0.4 manganese 0.3 0.3 1,0 1,5 1,5 2.0 chromium 0.5 0.5 1,0 1,5 1,5 2.0 nickel 0.1 0.1 1,0 2.0 3.0 4.0 The inequality Ni + 1.2 · Cr + 1.5 · Mn≤9-0.6 · С + + + + + - molybdenum + 3 tungsten 0.02 0.2 0.2 0.5 1,5 0.5 V, ° C / s 10 fourteen twenty fifty 75 one hundred The calculated value of V, ° C / s ≥14.87 ≥14.87 ≥1.82 ≥1.10 ≥0.85 ≥0.73

Table 4 Mechanical and corrosive properties of steel Option Properties one 2 3 four 5 6 Yield strength, kg / mm ² 65 70 73 75 70 70 Temporary tensile strength, kg / mm ² 85 90 92 95 90 90 Relative extension, % fourteen 16 17 eighteen 17 17 Relative narrowing,% 52 54 55 56 54 55 Impact strength, j / cm 7.0 8.0 8.0 9.0 7.0 8.0

Options 3, 4 correspond to the utility model. Option 4 is optimal. Options 1, 2 do not satisfy this utility model, since the cooling rate is lower than that calculated by the formula, a mixed structure of martensite, bainite, and even perlite is present in the blanks. An inhomogeneous structure leads to a decrease in the plastic properties of steel and impact strength, especially after softening heat treatment. Option 5 does not satisfy this utility model, as it has a high content of molybdenum and tungsten. Option 6 does not satisfy this utility model, since it has a total amount of manganese, chromium and nickel exceeding the limit specified in the invention.

Claims (25)

1. The product is made of structural high-strength steel of predominantly cylindrical extended form containing carbon, silicon manganese, chromium, nickel and molybdenum characterized in that it is made of steel with components in the following proportions, wt.%: Carbon 0.15-0.45 Sulfur up to 0.05 Phosphorus up to 0.05 Silicon 0.2 ÷ 1.0 Manganese 0.2 ÷ 2.0 Chromium 0.1 ÷ 2.0 Nickel 0.1 ÷ 5.0 Molybdenum + 3Tungsten 0.01 ÷ 0.9 Iron and impurities Rest subject to the following ratio: Ni + 1.2 · Cr + 1.5 · Mn≤9-0.6 · C, and the product is manufactured using at least the hot deformation operation and, depending on the nickel content, is cooled from the temperature of the end such deformation, exceeding the critical temperature A _cl , with a speed V≥0.37 + 1.45 / Ni, where V is the cooling rate of the workpieces, ° C / s. 2. The product according to claim 1, characterized in that before hot deformation is heated in a heating furnace to a temperature exceeding at least the critical temperature A _cl . 3. The product according to claim 1, characterized in that the hot deformation operation includes firmware on a cross-helical rolling mill, as well as hot rolling on a rolling and / or reduction mill and / or longitudinal rolling mill to obtain especially thick-walled pipes up to 10 m in diameter from 25 to 50 mm and an inner diameter of the hole from 6.0 to 10.0 mm. 4. The product according to claim 1, characterized in that after the operation of hot deformation and cooling of the product, it is additionally heated and maintained at a temperature exceeding at least the critical temperature A _cl , and the cooling operation is carried out after such additional heating. 5. The product according to claims 1 and 4, characterized in that it is cooled in air, for example, on a rack refrigerator or using additional devices, for example, in an environment with increased cooling capacity. 6. The product according to claim 1, characterized in that after cooling it is subjected to softening heat treatment by heating the workpieces to a temperature of 500 ÷ 750 ° C, holding for up to 10 hours, followed by cooling. 7. The product according to claim 1, characterized in that it is manufactured using the operation of cold mandrel or safety drawing, which is carried out after cooling the workpieces and / or after their softening heat treatment. 8. The product according to claim 1, characterized in that the workpieces are subject to finish heat treatment and / or are subject to dressing, turning and / or grinding of the surface. 9. The product according to claim 1, characterized in that the steel used has an additional content of at least one of the elements: niobium, vanadium, titanium, tantalum, calcium, barium in the range of 0.005 ÷ 1.0 wt.%. 10. The product according to claim 1, characterized in that used steel with an additional copper content in an amount of 0.01 ÷ 1.5 wt.%. 11. The product according to claim 1, characterized in that the steel used is at least one of the following additional components: cerium, rare earth metals, zirconium, yttrium, magnesium, arsenic, selenium, and each additional component is contained in the product in an amount 0.001 ÷ 0.1 wt.%. 12. The product according to claim 1, characterized in that steel with an additional content of lanthanum in an amount of 0.005 ÷ 0.02 wt.% And / or cobalt in an amount of not more than 1.0 wt.% Is used. 13. The product according to claim 1, characterized in that the product is made at least from one end with the formation of slots for subsequent connection, for example, with the shaft of a submersible pump. 14. The product according to item 13, wherein the slots are made straight-line or involute execution by cutting and / or plastic deformation. 15. The product according to claim 1, characterized in that it has a deviation from straightness of not more than 0.4 mm per linear meter of length, and the roughness of its surface R _a not more than 2.5 μm at a base length of 0.8 mm. 16. The product according to claim 4, characterized in that the additional heating of the products, followed by cooling, is carried out separately, for example, in another process. 17. The product is made of structural high-strength steel, mainly of a cylindrical extended form, containing carbon, silicon manganese, chromium, nickel and molybdenum, characterized in that it is made of steel with components in the following proportions, wt.%: Carbon 0.15 ÷ 0.45 Silicon 0.2 ÷ 1.0 Manganese 0.2 ÷ 2.0 Chromium 0.1 ÷ 2.0 Nickel 0.1 ÷ 5.0 Molybdenum + 3Tungsten 0.01 ÷ 0.9 Iron and impurities Rest subject to the following ratio: Ni + 1.2 · Cr + 1.5 · Mn≤9-0.6 · C. 18. The product according to p. 17, characterized in that the steel is used with an additional content of at least one of the elements: niobium, vanadium, titanium, tantalum, calcium, barium in the range of 0.005 ÷ 1.0 wt.%. 19. The product according to 17, characterized in that the steel used is with an additional copper content in an amount of 0.01 ÷ 1.5 wt.%. 20. The product according to claim 17, characterized in that the steel is used with at least one of the following additional components: cerium, rare earth metals, zirconium, yttrium, magnesium, arsenic, selenium, and each additional component is contained in the product in an amount 0.001 ÷ 0.1 wt.%. 21. The product according to claim 17, characterized in that steel with an additional content of lanthanum in an amount of 0.005 ÷ 0.02 wt.% And / or cobalt in an amount of not more than 1.0 wt.% Is used. 22. The product according to claim 17, characterized in that it is made in the form of a predominantly cylindrical hollow shaft up to 10 m long. 23. The product according to 17, characterized in that the product is made at least from one end with the formation of slots for subsequent connection, for example, with the shaft of a submersible pump. 24. The product according to item 23, wherein the slots are made straight-line or involute execution by cutting and / or plastic deformation. 25. The product according to 17, characterized in that it has a deviation from straightness of not more than 0.4 mm per linear meter of length, and the roughness of its surface R _a not more than 2.5 μm at a base length of 0.8 mm.