Non-heat treated wire rod having excellent drawability and impact toughness and method for manufacturing same
AssigneePosco
InventorsDong-Jun Mun, In-Gyu Park, Se-Hong Min
Life of this patent
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Abstract
Provided are a non-heat treated wire rod having high drawability and impact toughness, and a method for manufacturing the non-heat treated wire rod. The non-heat treated wire rod includes, by wt %, C: 0.02% to 0.30%, Si: 0.05% to 0.8%, Mn: 0.5% to 2.0%, Cr: 1.0% or less, P: 0.03% or less, S: 0.03% or less, sol.Al: 0.01% to 0.07%, N: from greater than 0.01% to 0.02%, Nb: 0.1% or less, V: 0.5% or less, and Ti: 0.1% or less, and a balance of Fe and inevitable impurities, wherein the non-heat treated wire rod has a microstructure including ferrite and pearlite.
Claims6
A non-heat treated wire rod, the non-heat treated wire rod comprising, by wt %, C:
- 0.02% to 0.30%, Si:
- 0.05% to 0.8%, Mn:
- 0.5% to 2.0%, Cr:
- 1.0% or less, P:
- 0.03% or less, S:
- 0.03% or less, sol.Al:
- 0.01% to 0.07%, N:
- from greater than 0.01% to 0.02%, Nb:
- 0.1% or less, V:
- 0.5% or less, and Ti:
- 0.1% or less, and a balance of Fe and inevitable impurities,
- wherein the non-heat treated wire rod has a microstructure comprising ferrite and pearlite, and
- the ferrite and the pearlite alternate with each other and are continuous or discontinuous in a direction parallel to a rolling direction of the non-heat treated wire rod such that the non-heat treated wire rod has a banded structure formed by ferrite bands and pearlite bands,
- wherein the ferrite has an average grain size of 10 m in a C cross-section perpendicular to the rolling direction, and
- wherein when a 30% to 60% drawing process is performed on the non-heat treated wire rod, the non-heat treated wire rod has an average room-temperature impact toughness of 100 J or more.
A non-heat treated wire rod, the non-heat treated wire rod comprising, by wt %, C:
- 0.02% to 0.30%, Si:
- 0.05% to 0.8%, Mn:
- 0.5% to 2.0%, Cr:
- 1.0% or less, P:
- 0.03% or less, S:
- 0.03% or less, sol.Al:
- 0.01% to 0.07%, N:
- from greater than 0.01% to 0.02%, Nb:
- 0.1% or less, V:
- 0.5% or less, and Ti:
- 0.1% or less, and a balance of Fe and inevitable impurities,
- wherein the non-heat treated wire rod has a microstructure comprising ferrite and pearlite,
- the ferrite comprises a plurality of ferrite bands continuously or discontinuously formed in a direction parallel to a rolling direction of the non-heat treated wire rod with predetermined intervals therebetween, and
- the pearlite comprises a plurality of pearlite bands continuously or discontinuously formed on inner or outer sides of the ferrite bands in the direction parallel to the rolling direction of the non-heat treated wire rod,
- wherein the ferrite has an average grain size of 10 m in a C cross-section perpendicular to the rolling direction, and
- wherein when a 30% to 60% drawing process is performed on the non-heat treated wire rod, the non-heat treated wire rod has an average room-temperature impact toughness of 100 J or more.
Dependencies are inferred from the claim text.