Alloy Structural Steel Supplier ODM Alloy Structural Steel Supplier Stock

Alloy Structural Steel Supplier ODM Alloy Structural Steel Supplier Stock

1.
Structural alloy steel (structural alloy steel) refers to steel that is used as
mechanical parts and various engineering components and contains one or several
alloying elements in a certain amount.

2.
Alloy structural steel is generally divided into quenched and tempered
structural steel and case-hardened structural steel.
① The carbon content of quenched and tempered structural steel is generally
about 0.25% to 0.55%. For structural parts of a given cross-sectional size,
during the quenching and tempering treatment (quenching and tempering), if it
is quenched along the section, the mechanical properties It is good, but if
hardenability is not carried out and free ferrite appears in the
microstructure, the toughness decreases. For steels with a tendency to temper
brittleness, such as manganese steel, chromium steel, nickel-chromium steel,
etc., they should be cooled quickly after tempering. The quenching critical
diameter of this type of steel increases with the increase of grain size and
alloying element content. For example, 40Cr and 35SiMn steels are about 30 to
40 mm, while 40CrNiMo and 30CrNi2MoV steels are about 60 to 100 mm. Structural
parts such as shafts and connecting rods with large loads.
②Surface hardening structural steel is used to manufacture parts with hard and
wear-resistant surface and flexible core, such as gears, shafts, etc. In order
to make the toughness of the core of the part high, the carbon content in the
steel should be low, generally 0.12 to 0.25%, and there should be an
appropriate amount of alloying elements to ensure suitable hardenability.
Nitride steel also needs to add alloying elements (such as Al, Cr, Mo, etc.)
that are easy to form nitrides. Carburizing or carbonitriding steel, after
carburizing or carbonitriding at 850~950℃, quenched and used in low
temperature tempering (about 200℃). Nitrided steel is treated by nitriding
(480～580℃) and used directly without quenching and tempering.

3.Production Process
According to the steel grade and steel quality requirements, the smelting of
alloy structural steel can be carried out by oxygen top-blown converter, open
hearth, electric arc furnace; or by electroslag remelting and vacuum degassing.
The ingot can be cast by continuous casting or die casting. The ingot should be
slowly cooled or hot forged and rolled. When the ingot is heated, the
temperature should be uniform and there should be sufficient holding time to
improve segregation defects and avoid uneven deformation during forging and
rolling; the steel after forging and rolling is small in size, especially
carburizing with a carbon content of about 0.2%. Steel should be cooled rapidly
at temperatures above 600°C to avoid aggravating the banded structure; for
forgings with larger cross-sections, measures should be taken to eliminate
internal stress and white spots. Quenched and tempered steel should be quenched
into martensite structure as much as possible, and then tempered into sorbite
structure; in the carburizing process of carburized steel, the concentration
gradient of the carburizing layer should not be too large, so as to avoid
continuous network on the grain boundary of the carburizing layer. Carbide;
nitrided steel must first be heat treated to obtain the required properties,
and then final finishing can be used for nitriding. After nitriding treatment,
no processing is required except that the brittle "white layer" is ground and
removed.

4.
Songshun specialized in Special Steel for almost 20 years. We can supply mold
steel, high speed steel, alloy steel, free cutting steel and etc.Welcome your
contact 24 hours a day!!!
E-mail:jacklu@songshunsteel.com
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http://www.songshunsteel.com/
songshunsteel , 41404340

Minimum Order: 2 tons

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