Steel 25 structural carbon steel

Characteristics of steel grade 25

Steel 25 is a structural high-quality carbon steel, weldable without restrictions. Welding is carried out without heating and without subsequent heat treatment, methods: manual arc welding, automatic submerged arc welding and gas protection, CTS, ESW.

Use in industry after normalization or without heat treatment for the production of axles, shafts, couplings, pawls, forks, levers, washers, rollers, flanges, tees. Fasteners for boilers and pipelines of thermal power plants, steam, gas and hydraulic turbines are made from it. After chemical-thermal treatment, it is used for the manufacture of gears, screws, bushings, pawls, friction discs, fingers, cam rollers, pushers and other parts that require high surface hardness with low core strength. Not prone to flake sensitivity, no tendency to temper brittleness. Cutting machinability in the hot-rolled state at HB 156 and δB = 460-500 MPa, K υ solid. spl=1.5 and Kυ b.st=1.26. Forging is carried out at temperatures from 1280 to 750 0C, cooling in air. A large assortment of rolled products is produced from steel 25, taking into account the special features of steel grade 25. Forgings from this grade of steel can be made of strength categories only 175, 195, 215, 245 with a forging thickness from 100 to 300 mm. To obtain forgings with a higher strength category, it is necessary to use a different steel. In the production of forgings, blooms or ingots of steel, rolled or forged billets, or billets cast on a continuous casting line and other types of rolled products are used.

Description

Steel 25L is used : for the manufacture of castings for rolling mill beds, pulleys, traverses, pistons, axle boxes, cylinder covers, floor plates, frames of roller tables and trolleys, molds, bearing housings, parts of welded cast structures and other parts operating at temperatures from -40 up to +450 °C under pressure; castings of parts for gas turbines and axial compressors operating at temperatures from -40 to +350 °C; castings of the 2nd and 3rd groups of pipeline fittings parts with a working medium temperature from -30 to +450 °C without limiting the nominal operating pressure; castings of parts of mining and metallurgical equipment; parts of stationary steam turbines operating at temperatures up to 425 °C; cast centers of wheel pairs of locomotives and motor cars of electric trains and diesel trains of 1520 mm gauge railways in the UHL climate design; castings of equipment parts (fittings) for nuclear power plants, heat supply stations, combined heat and power plants, experimental and research nuclear reactors and installations; centrifugally cast pipes used as components in the equipment of the metallurgical, mechanical engineering, glass, ceramic, mining and processing petrochemical industries, as well as intended for the manufacture of blanks and parts used in the composition of products in the aviation and nuclear industries.

Note

Pearlitic grade steel. It is allowed to use castings of pipeline fittings parts made of steel grade 25L up to an operating temperature of minus 40 °C, subject to heat treatment in the hardening plus tempering or normalizing plus tempering mode with impact strength testing KCU-40≥200 kJ/m2 (2.0 kgf m /cm2).

Supply steel 25

Supplied in the form of long products, including shaped steel according to the regulations of GOST 2590-88 Hot-rolled round steel , GOST 2591-88 Hot-rolled square steel , GOST 8239-89 Hot-rolled steel I-beams , GOST 19771-93 Equal-flange bent steel angles, GOST 19772 -93 Bent steel angles, unequal flanges , GOST 8278-83 Bent steel channels, equal flanges , GOST 8281-80 , unequal , GOST 8283-93 steel trough equal flange profiles , GOST 380-94 Carbon steel of ordinary quality , GOST 85 09-93 Steel corners hot-rolled equal flange , GOST 8510-86 rolled steel angles unequal-flanged , GOST 8240-97 Hot-rolled steel channels , GOST 535-88 Rolled bars and shaped carbon steel of ordinary quality , GOST 2879-88 Rolled hot-rolled hexagonal steel, GOST 19903-2015 Hot rolled sheet products , GOST 19904-90 Cold-rolled sheets , GOST 16523-97 Rolled thin sheets of high-quality and ordinary quality carbon steel for general purpose, GOST 503-81 Cold-rolled low-carbon steel strip, GOST 103-76 Hot-rolled steel strip , GOST 82-70 Hot-rolled steel Wide-band universal, GOST 3282-74 Wire Steel low-carbon general purposes , GOST 17305-71 Carbon structural steel wires, GOST 10705-80 steel power steel pipes , GOST 10706-76 Pipes steel eight-dimensional , GOST 3262-75 Pipes steel water and gap-pipes .

Interpretation of steel grade St6sp

Decoding of steel: The letter at the beginning indicates a group of steel which defines the criteria for the ultimate strength for the chemical composition; if there is no letter, then such steel belongs to group A, and is supplied to consumers based on mechanical properties (such steel may have a high sulfur or phosphorus content). Letters St. indicate that the steel is of ordinary quality, although most steels are high quality. The numbers from 0 to 6 are the conventional brand number depending on the chemical composition and mechanical properties. Typically, the higher the number, the more carbon and the greater the strength. In our case, 6 indicates the carbon content in the alloy is 0.38–0.49%. The letters after the brand number indicate the degree of deoxidation: cn - calm. In terms of price, calm steels have become more expensive than semi-calm and boiling steels. Mild steel is steel obtained as a result of deoxidation. It is obtained by deoxidation with aluminum, manganese and silicon. The level of oxygen in it is so reduced that during metal processing no reaction occurs between carbon and oxygen, and the presence of non-metallic slags and their inclusion is reduced to a minimum. Calm steel has a dense structure and good mechanical properties. It is less prone to negative reactions to welding heat and to aging. The features of a homogeneous microstructure give the alloy maximum corrosion resistance and ductility.

Mechanical properties of rolled steel 25

Buy 6PS steel in Moscow and the Moscow region

6PS steel is widely used in various fields of industry, used in mechanical engineering, involved in the manufacturing industry, covers a wide range of construction, shipbuilding, and is partially used in aircraft production and many other areas of industry. There are a large number of steel grades, a huge part of the alloys are made to order, and those steel grades that are in great demand are partially stored for regular customers. The Metalpro company carries out wholesale and retail sales on the territory of the Russian Federation; 6PS steel is partly in our warehouse in the form of rolled metal products, and partly we ship directly from the metallurgical plant. With constant demand, we are ready to offer mutually beneficial cooperation, delivery directly from the factory by carriage standards, as well as by motor vehicles. You can buy 6PS steel in Moscow and the Moscow region at a favorable price from the Metallpro Trading Company under a mutually beneficial contract for a long partnership period.

Mechanical properties of forgings steel 25

Mechanical properties of steel 25 at elevated temperatures

Price for steel 6PS

The favorable price for 6PS steel grade is explained by the presence of a competitive environment, low markups and loading from leading metallurgical plants directly, sometimes bypassing storage at transshipment points. Metalpro company bears full responsibility for the chemical composition of the supplied products and guarantees the quality of delivery. The cost of 6PS steel in warehouses in Moscow and the Moscow region is determined by the costs of warehousing and logistics. The Metallpro Company can also supply 6PS steel directly from the metallurgical plant, which gives our partners an advantage to consistently save money and develop their business in a broad format.

The price for 6PS steel is determined personally with each company, monthly needs are individually negotiated and the form of payment is discussed. Warehouse services for custom-made items and logistics to the production site also form the cost of 6PS steel. The Metalpro company maintains an open dialogue personally with each of its clients; each transaction is accompanied by a personal manager from the production stage to the delivery of rolled metal to the customer. Full control at any stage from payment to delivery to the customer’s site gives the latter a complete picture.

Mechanical properties of steel 25 at normal temperature

Physical properties of steel 25

Calculated properties: steel density is 7840 kg/m3

Chemical composition

Fe is the basis. According to GOST 977-88, the mass fraction of S and P content is indicated for group 1 of castings made of base steel. The content of sulfur and phosphorus in castings of groups 2 and 3, in acid and basic open-hearth steel - see table 4a in GOST 977-88. According to OST 5R.9285-95, in the case of using steel smelted in main electric furnaces as cold-resistant (technical order conditions or drawing requirements), the content of sulfur and phosphorus should be no more than 0.020% each. By agreement between the manufacturer and the developer of OST 5R.9285-95 (TsNII Prometey), the content of sulfur and phosphorus is allowed up to 0.030% each. According to TU 5.961-11151-92 for castings of classes 1 and 2, the mass fraction of cobalt in steel should not exceed 0.20%, and for castings located in the direct irradiation zone - 0.15%.

Hardness of steel grade 25

Designations

Foreign analogues steel 25

• Structural steel
• Tool steel