Carbon steel of ordinary quality GOST 380-88

Characteristics of steel grade St3Gps

St3Gps - Structural carbon steel of ordinary quality, welds well, welding is carried out without heating and without subsequent heat treatment, welding methods: manual arc welding, automatic submerged arc welding and gas protection, KTS, ESW. For thicknesses greater than 36 millimeters, heating and subsequent heat treatment are recommended; it is not prone to flake sensitivity, but there is a tendency to temper brittleness. Machinability by cutting in the hot-rolled state at НВ 124 and σв=410 MPa, Kυ hard alloy. = 1.8 and Kυ b.st. = 1.6, has found its application in the production of rolled sheets with a thickness of 10 to 36 mm for load-bearing elements of welded structures operating under variable loads in the temperature range from -40 to +425 degrees, thickness above 30 mm for welded structures operating with variable loads in temperature conditions from -20 to +425 degrees and for load-bearing elements of welded structures operating from -20 to 425 degrees, subject to order and delivery with guaranteed weldability. Forging is carried out at temperatures from 1250 to 800 0C, cooling is carried out in air. According to GOST 27772-88, steel St3Gps corresponds to steel for building structures S255 and S285.

Carbon steel of ordinary quality GOST 380-88

Application area.

Carbon steel of ordinary quality is intended for the production of hot-rolled products: long-rolled, shaped, thick-sheet, thin-sheet, wide-rolled and cold-rolled thin-sheet, as well as ingots, blooms, slabs, rounds, rolled and continuously cast billets, pipes, forgings and stampings, strips, wires, hardware and etc.

Classification.

Carbon steel of ordinary quality is produced in the following grades: St0, St1kp, St1ps, St1sp, St2kp, St2ps, St2sp, St3kp, St3ps, St3sp, St3Gps, St3Gsp, St4kp, St4sp, St4ps, St5ps, St5sp, St5Gps, St6ps, St6sp.

The letters St stand for steel.

The numbers 0,1, 2, 3, 4, 5, 6 are the conventional brand number depending on the chemical composition. Increasing the number means increasing carbon content and tensile strength.

The degree of deoxidation of steel is indicated by letters after the numbers:

kp – boiling;

ps – semi-calm;

sp – calm;

Interpretation of steel grade St3Gps

Decoding steel: Letter 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, the number 3 indicates the carbon content in the alloy is 0.14–0.22%. G - indicates the manganese content in steel is about 1%. The letters after the brand number indicate the degree of deoxidation: ps - semi-calm. Steels of the first group, such as St3sp, are supplied with guaranteed mechanical properties and are used mainly without heat treatment.

Application of steel grade C255

Builders distinguish 4 groups of building metal structures, classified according to the degree of their responsibility and the conditions of their operation. The most demanding is the first group, which includes welded structures forced to work in particularly difficult conditions, including those exposed to fairly large vibration, dynamic and moving loads. In this case, it is allowed to use only the steel grade C255 we are considering, as well as C285, C345 or C375.

The first group includes such structures as elements of bridge spans, power transmission line supports, crane beams, unloading and bunker overpasses, transport galleries, trusses, etc.

Supply St3Gps

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 .

Steel S255: chemical composition and GOST standards for rental

Carbon steel C255 (carbon share is about 0.2%) is produced in accordance with GOST 27772-88, which determines the following composition of the chemical elements of the steel alloy:

• Fe – about 97%
• C – up to 0.22%
• Mn – up to 0.65%
• Si – 0.15-0.3%
• Ni – up to 0.3%
• Cr – up to 0.3%
• Cu – up to 0.3%
• S – up to 0.05%
• P – up to 0.04%
• N – up to 0.012%

Hot rolled shaped steel C255:

• GOST 8509 – equal angle angle
• GOST 8510 – unequal corner
• GOST 8239, 26020 – I-beam
• GOST 8240 – channel
• GOST 19425 – I-beam and special channel

In addition, carbon steel 255 is used for the production of rolled products:

• GOST 19903 – sheet
• GOST 82 – universal broadband
• GOST 8568 – sheet metal with lentil and rhombic corrugation

Bent profiles are also made from steel of this grade: according to GOST 7511, 8278, 8281, 8282, 8283, 9234, etc.

Mechanical properties of steel St3Gps

Mechanical properties of steel St3Gps according to GOST 535-2005 regulations is sold in the form of hot-rolled steel with a cross-section of up to 10 mm, from 10 to 20 mm, from 20 to 40 mm, from over 40 mm to 100 mm, and also from more than 100 mm. Rolled thickness: 10-20 mm, yield strength: > 245 MPa, tensile strength: 370-490 MPa, relative elongation: > 26%, bending until the sides are parallel: d=1.5a. Rolled thickness: 20-40 mm, yield strength: > 235 MPa, tensile strength: 370-490 MPa, relative elongation: > 25%, bending until the sides are parallel: d=2.5a. Rolled thickness: 40-100 mm, yield strength: > 225 MPa, tensile strength: 370-490 MPa, relative elongation: > 23%, bending until the sides are parallel: d=2.5a. Rolled thickness: > 100 mm, yield strength: > 205 MPa, tensile strength: 370-490 MPa, relative elongation: > 23%, bending until the sides are parallel: d = 2.5a. Rolled thickness: < 10 mm, yield strength: > 235 MPa, tensile strength: 370-490 MPa, relative elongation: > 26%, bending until the sides are parallel: d = 2.5a Below are the data in a tabular version:

Prices for steel sheets

In APEX metal you can buy sheet steel 3 in sheets and rolls at a low price:

• for use in construction
• manufacturing of general purpose products, pipes, bent profiles

Depending on the purpose, steel sheet 3 is produced from grades with different chemical compositions and properties in accordance with GOST 380, GOST 19281, GOST 27772, TU.

• Thin-sheet and thick-sheet hot-rolled products are made from steel Z of ordinary quality with a chemical composition that must meet the requirements of GOST 380:

• Thick-sheet hot-rolled sheets of high strength steel 3 with a basic chemical composition in accordance with GOST 19281 are produced with regulated or controlled rolling with accelerated cooling to ensure the following strength classes:

• Hot-rolled sheets GOST 27772, intended for the manufacture of welded and other building structures:

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Impact strength of steel St3Gps

Construction steel grades - analogues and replacement

One of the important characteristics of construction rolled steel 3 is its resistance to brittle fracture. To confirm these properties, samples of steel sheets undergo impact bending tests at decreasing temperatures.

The level of resistance to brittle fracture of rolled sheets in accordance with GOST 27772 is guaranteed by the required value of impact strength (KCU - when tested for impact bending with a U concentrator). For steels smelted according to EN standards, this value is the fracture coefficient (KV).