Low-magnetic steel grade 45G17YUZ for sheet and profile products

Designations

Welding steel 45. Practice

If work is carried out outside equipped workshops, then it is difficult to ensure strict adherence to the technology. In this case, you can use the following method:

1. Preparing parts for welding : cleaning, forming edges for welding seams.
2. Warming up parts using a gas (propane, acetylene) cutter or torch . To determine the temperature, you should use an infrared pyrometer; thermal pencils are also used, which begin to melt when certain values ​​are reached.
3. Welding is carried out as quickly as possible ; if necessary, the parts can be additionally heated during the process.
4. Upon completion of work, the product must be placed in a container with sand so that the cooling process occurs as slowly as possible.
5. If the part is too large and cannot be removed into the sand, then you can heat the welding area with a cutter or torch , gradually reducing the temperature.

In some cases, it is possible to use the “cold” welding method. For this, it is recommended to use a semiautomatic device or argon, since the heating zone in this case will be smaller than when using coated electrodes.

Welding is done as follows:

• elements of the product are assembled onto small tacks - 5-7 mm with a pitch of about 150 mm;
• The structure should be scalded with small seams , it is important not to let the metal get too hot;
• If possible, the seams should be placed unevenly on different sides of the product..

Important: this method cannot be used when welding critical structures.

When using the cold method, it is necessary to conduct a thorough visual inspection of the seams and check the strength of the joints, since the likelihood of cracks is high.

Description

Steel 45G17Yu3 is used : for the production of rolled sheets up to 60 mm inclusive and strip bulbs used in various metal structures and equipment in shipbuilding; long and shaped rolled products; forgings and stampings; light-loaded structures of ship hulls, ships and marine equipment products (sheet and profile parts of surface ship hulls, forgings welded into the hull, chains and chain devices, winches, capstans, axles, drums, bolts, nuts, studs, gears and worms for low-speed mechanisms , frames, casings, hatch covers, rescue devices, doors, cable hangers, pilot post spools (in a nitrided state, ballasts, ship engine housings); transformer parts.

Note

Low-magnetic steel of austenitic class. Magnetic permeability μ ≤ 1.01 gs/e. Cold forming, as well as mechanical cutting, slightly changes the magnetic permeability of steel, but the value of this characteristic after these technological operations does not exceed 1.01 gf/e, if the cold deformation does not exceed 50%. The magnetic field of products increases sharply in the presence of scale, which is ferromagnetic. Scale must be completely removed. Steel cannot be used for friction parts and parts operating in aggressive environments.

45G17Yu3 (Yu3, EI839)

• Products made of steel 45G17Yu3 (Yu3, EI839) in stock:
  Circle
• Sheet
• Square

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Steel 45G17Yu3 (Yu3, EI839) for shipbuilding, low-magnetic austenitic class

Steel 45G17Yu3 is used: for the production of rolled sheets up to 60 mm inclusive and strip bulbs used in various metal structures and equipment in shipbuilding; long and shaped rolled products; forgings and stampings; light-loaded structures of ship hulls, ships and marine equipment products (sheet and profile parts of surface ship hulls, forgings welded into the hull, chains and chain devices, winches, capstans, axles, drums, bolts, nuts, studs, gears and worms for low-speed mechanisms , frames, casings, hatch covers, rescue devices, doors, cable hangers, spool valves of pilot posts (in a nitrided state, ballasts, ship engine housings); transformer parts. Magnetic permeability μ ≤ 1.01 gf/e. Cold forming, and Also, mechanical processing by cutting slightly changes the magnetic permeability of steel, but the value of this characteristic after these technological operations does not exceed 1.01 gf/e, if the cold deformation does not exceed 50%. The magnetic field of products increases sharply in the presence of scale, which is ferromagnetic. The scale must be completely removed. Steel cannot be used for friction parts and parts operating in aggressive environments.

Specifications

Standards

Checking Welded Joints

In production, effective control methods are used: scanning of seams with x-rays or ultrasound. This allows you to detect most defects: lack of penetration, cracks, fistulas.

If possible, then weld test samples from 45 steel, cut the seams with a grinder and inspect them visually. There should not be:

• pores - small bubbles that significantly worsen the properties of the seam. A small number of pores is allowed;
• cracks - during the operation of the structure they can increase and cause destruction of the connection;
• fistulas - also affect the strength of the suture.

In cases where the product is intended to operate under loads, it is recommended to check the connections mechanically. To do this, the part is subjected to loads. For example, if a weld must withstand a load of 10 tons, the test should be carried out with a weight 30% higher - 13 tons.

Chemical composition

Fe is the basis.

Analogs of steels. Corrosion-resistant steel

Mechanical characteristics

45G17Yu3: circle, sheet, square, hexagon

Steel grade 45G17Yu3 is produced on the basis of C-Fe-Mn-Al alloying and has low magnetic permeability. This property allows this grade of steel to be used in electrical engineering, in particular in the manufacture of transformers. Characteristics of steel 45g17yu3

The austenitic structure of steel under normal temperature conditions does not change under deformation loads. The welding properties of the metal and its malleability to machining contribute to the widespread use of steel 45G17Yu3:

• in shipbuilding, for the manufacture of sheet and profile parts of hulls, as well as many other parts and mechanisms of ships, including ship engine housings;
• in the mining industry, for trays used in the transportation of minerals;
• in construction, as the use of various metal structures.

physical characteristics

Technological properties

Steel 45G

Structural alloy steel 45G

Brand 45G – purpose

Structural alloy manganese steel 45G is used for the manufacture of parts - driveshafts/crankshafts, anchor bolts, gear/spline shafts, gears, friction discs, brake levers, axles, connecting rods, and other products.

Steel 45G - domestic analogues

Material 45G - characteristics

Alloy structural steel

Brand 45G – technological features

Flock sensitivity

Machinability Ku

Tendency to temper brittleness

Steel 45G - chemical composition

Mass fraction of elements no more than, %:

Material 45G – mechanical properties

Depending on the cross-section of the workpiece

Quenching (water) 840 0 C. Tempering (air) 570 0 C

Hardness, MPa

Temperature of critical points, 0 C

Endurance limit, MPa

Brand 45G - exact and closest foreign analogues

Steel 45G – area of ​​application

Material grade 45G is used in mechanical engineering for the manufacture of high-strength parts.

Legend

Elongation at break

Short-term strength limit

Relative machinability factor

Proof of yield strength with 0.2% tolerance when loaded to plastic strain value

Torsional endurance limit (symmetrical cycle)

Endurance limit under compression-tension (symmetrical cycle)

number of deformation/stress cycles sustained by an object under load before fatigue failure/crack appears

You can buy 45G structural alloy steel in St. Petersburg by calling +. Specialists will place your order and advise you on the assortment, prices, and delivery conditions.

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