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Non-heat treated rolled steel and drawn wire rod with excellent toughness, and method for manufacturing the same

A non-heat treatment, toughness technology, applied in the field of preparing the rolled steel and the drawn steel wire rod, rolled steel and a drawn steel wire rod, can solve problems such as uneconomical, achieve excellent toughness and cold forgeability, and save the heating step Effect

Active Publication Date: 2012-05-23
POSCO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above mentioned process is not economical due to the use of expensive Cr

Method used

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  • Non-heat treated rolled steel and drawn wire rod with excellent toughness, and method for manufacturing the same
  • Non-heat treated rolled steel and drawn wire rod with excellent toughness, and method for manufacturing the same
  • Non-heat treated rolled steel and drawn wire rod with excellent toughness, and method for manufacturing the same

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Experimental program
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Effect test

Embodiment

[0064] Rolled steels were prepared from steel Nos. 1-9 described in Table 1 below under the manufacturing conditions described in Table 2 below. No. 1-3 steel, No. 8 and No. 9 steel do not satisfy the composition and composition range controlled according to the present invention. No. 4-7 steel meets the components and composition ranges controlled according to the present invention.

[0065] In addition, Table 1 shows A for each type of steel e3 (° C.), and the tensile strength and V-impact toughness of the rolled steel produced according to the preparation conditions were measured, and then shown in Table 2 below.

[0066] And, SEM photographs of the microstructures of Inventive Example 1, Comparative Example 1, and Comparative Example 7 are shown in the drawings.

[0067] Table 1

[0068] steel model

C (weight%)

Si(wt%)

Mn(weight%)

P (weight%)

S (weight%)

Ae 3 (℃)

No. 1 steel

0.14

0.11

1.9

0.031

0.023 ...

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Abstract

There is provided a rolled steel with excellent toughness, a drawn wire rod prepared by drawing the rolled steel, and a method for manufacturing the same, in which even if a heating step is omitted, the toughness of the steel can be improved by securing a de-generated pearlite structure in an internal structure of the rolled steel by controlling a content of Mn among components and cooling conditions, and then preventing C diffusion. The rolled steel according to the present invention includes C: 0.15 to 0.30 %, Si: 0.1 to 0.2 %, Mn: 1.8 to 3.0 %, P: 0.035 % or less, S: 0.040 % or less, the remainder Fe, and other inevitable impurites, as a percentage of weight, in which the microstucture of the rolled steel is composed of ferrite and pearlite including cementite with 150 nm or less of thickness.

Description

technical field [0001] The present invention relates to a rolled steel and a drawn wire rod used as structural steel, and more particularly to a rolled steel and a drawn wire rod having excellent toughness in which even heating is omitted step, a degenerate pearlite structure can also be obtained in the microstructure of the rolled and drawn steel wire rods by controlling the manganese content and its cooling conditions. In addition, the invention relates to a method of producing the rolled steel and the drawn steel wire. Background technique [0002] Most structural steels are quenched and tempered steels obtained by reheating, quenching, and tempering after hot working to increase toughness and strength. In contrast, non-heat-treated steel is steel that has not undergone heat treatment after hot working, that is, a steel that can obtain toughness and strength similar in properties to those of the material to be heated (heat-treated). Steels that are usable without heat t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/06
CPCC22C38/02C21D2211/009C22C38/04C21D2211/005C21D8/021C21D8/0263C21D8/06
Inventor 李侑焕金东炫李相润H-N·金朴龙植
Owner POSCO CO LTD
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