Welding of low alloy structural steel
The company Electrocentury-steel offers at an affordable price from the manufacturer various sizes of rolled low-alloy structural steel for welding constructions. Supplier of guaranteed immediate delivery of products to the address specified by the consumer.
Properties of the considered steels influencing their weldability
Low carbon content offers a good weldability of this group of steels. Therefore, in the first place come the problems of quality connections:
uniform strength of the weld along the length;
the conformity of the mechanical characteristics of the weld are similar to the settings for the base metal;
the absence of welding defects;
The geometrical characteristics of the seam;
Minimizing time spent on the production of welding operations.
Low carbon structural steel lend themselves well to all types of steel welding: arc, gas, etc. note, However, that the strength characteristics of these steels is low, and to ensure the required efficiency of a welded structure it is necessary to increase its consumption of materials. Therefore, the chemical composition of these steels required the presence of such alloying elements, which, due to the formation during melting of solid solutions of carbides and nitrides, has improved strength characteristics. Such elements include manganese, chromium and silicon, and the addition of Nickel increases the ductility of steel, and allows you to save at a high level and the resistance to creep under sustained loads. Also in the composition of these steels is present in minor amounts (up to 0,25…0,3%) copper, which increases the resistance of welded structures of various corrosion processes. The heat resistance of steels increases the molybdenum and tungsten. Domestic standards provide for up to 30 steel grades, intended for the production of welded structures, almost all of them are interchangeable.
To buy at an affordable price from the manufacturer rolled low alloy structural steel for welding constructions the company offers Electrocentury-steel. Supplier guaranteed timely delivery to any destination specified by the customer.
Technological modes of welding and consumables
Most of the requirements for compliance with welding technology present heat resistant steel with the structure of granular perlite. The main ones are steel марок12МХ, 12KH1MF, 20KHMFL, which are widely used in the production of power plants. The presence of molybdenum and tungsten increases the resistance of such steels (indicators persist up to temperatures of 450…5000S), but increases the sensitivity to heat treatment. Overheating of steel, alloyed with molybdenum and tungsten is more prone to weld cracking, especially if used for welding of the forced modes, which is characterized by increase of the welding currents. Therefore, when welding such steels, use low currents and other parameters — arc length and voltage on it is to regulate a much narrower range.
For manual arc welding electrodes are used type Э38, E42 and Э46 having a superficial coating. Part of the electrodes included low carbon steel grade 08KP. For gas welding and welding in shielding gases (carbon dioxide, argon) used electrodes made of structural steel 08G2S type.
The company Electrocentury-steel offers to buy at affordable prices from the manufacturer rolled low carbon alloy steels for welded structures. Supplier guaranteed timely delivery of goods to the point specified by the client.