Non-heat treated wire rod excellent in strength and cold workability and method for manufacturing same
A non-heat treatment and wire rod technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of affecting cold workability, increased sensitivity of non-metallic inclusions, etc., and achieve suppression of deformation resistance, excellent strength and cold forging characteristics Effect
Active Publication Date: 2018-08-03
浦项股份有限公司
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Problems solved by technology
[0006] Furthermore, the susceptibility of such non-metallic inclusions may be further increased when segregation of the central part causes matrix strengthening, thus affecting cold workability
Method used
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[0099] Hereinafter, an exemplary embodiment in the present disclosure will be described in more detail with reference to the following examples. However, the disclosure of such an embodiment is merely an example of implementing an exemplary embodiment in the present disclosure, and does not limit the present disclosure. This is because the scope of the present invention is determined based on the subject matter claimed in the appended claims and the modifications reasonably derived therefrom.
[0100] (Example)
[0101] A bloom having an alloy composition shown in Table 1 below was heated at 1250°C for 5 hours, and then rolled into a billet at a finish rolling temperature of 1150°C. Thereafter, the billet was heated at 1200° C. for 3 hours, and then hot-rolled to have a diameter of Φ25 mm, thereby producing a wire rod. At this time, the finish rolling temperature was continuously adjusted to 850° C., and the rolling ratio was continuously adjusted to 80%. Subsequently, the ...
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Abstract
Disclosed is a non-heat treated wire rod, comprising, as percentage by weight: C: 0.3-0.4%; Si: 0.05-0.3%; Mn: 0.8-1.8%; Cr: 0.5% or less; P: 0.02% or less; S: 0.02% or less; sol. Al: 0.01-0.05%; N: 0.01% or less; O: 0.0001-0.003%; at least one of Nb: 0.005-0.03% and V: 0.05-0.3%; and the balance being Fe and unavoidable impurities, wherein the non-heat treated wire rod includes ferrite and pearlite microstructures, and wherein the phase fraction of the pearlite satisfies the following relational expressions 1 and 2, and the average lamellar spacing of the pearlite satisfies the following relational expressions 3 and 4. [Relational expression 1] VP2 / VP1< / =1.4 [Relational expression 2] 50< / =(15VP1+VP2) / 16< / =70 [Relational expression 3] DL1 / DL2< / =1.4 [Relational expression 4] 0.1< / =(15DL1+DL2) / 16< / =0.3 (Wherein VP1 and VP2, respectively, mean, in the cross-section perpendicular to the longitudinal direction of the wire rod, a pearlite fraction (area%) in the region from the surface of the wire rod to the 3 / 8D position in the diameter (D) direction of the wire rod, and a pearlite fraction (area%) in the region from the 3 / 8D position in the direction of the diameter (D) of the wire rodto the center of the wire rod, and DL1 and DL2, respectively, mean, in the cross-section perpendicular to the longitudinal direction of the wire rod, the average lamellar spacing ([mu]m) of pearlitein the region from the surface of the wire rod to the 3 / 8D position in the diameter (D) direction of the wire rod, and the average lamellar spacing ([mu]m) of pearlite in the region from the 3 / 8D position in the direction of the diameter (D) of the wire rod to the center of the wire rod.)
Description
technical field [0001] The present disclosure relates to a non-heat-treated wire excellent in strength and cold workability and a manufacturing method thereof, and more particularly, to a non-heat-treated wire excellent in strength and cold workability and a manufacturing method thereof which can be suitably used as a material for machine parts. Background technique [0002] Since the cold working method has a remarkable effect on reducing heat treatment cost and providing excellent productivity when compared with the hot working method or mechanical cutting method, such cold working method is widely used to manufacture machine parts such as nuts and bolts. [0003] As described above, in order to manufacture mechanical parts using a cold working method, it is necessary that steel is excellent in cold workability, and more particularly, when cold working steel, deformation resistance must be low and ductility must be excellent. This is because when the deformation resistance...
Claims
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IPC IPC(8): C22C38/12C22C38/06C22C38/04C22C38/02C22C38/00C22C38/14C21D8/06
CPCC21D8/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D9/0075C21D2211/005C21D2211/009C21D2211/004C21D8/065C21D9/525C22C38/001C22C38/002C22C38/24C22C38/26C22C38/28C22C38/00C21D6/002C21D6/005C21D6/008
Inventor 文东俊李相润
Owner 浦项股份有限公司