Wire rod for cutting work

Patent metadata

Field	Value
Publication number	US-2020248291-A1
Application number	US-201816488687-A
Country	US
Kind code	A1
Filing date	Feb 27, 2018
Priority date	Feb 28, 2017
Publication date	Aug 6, 2020
Grant date	—

Abstract

Provided is a wire rod that has superior machinability by cutting regardless of the type of tool material and the type of lubricant and even in the case where no lubricant is used. A wire rod for cutting work comprises: a specific chemical composition; and Vickers hardness that satisfies the following expressions (1) and (2) in the case where an average aspect ratio of ferrite grains at a position of 1/4 of a diameter from a surface of the wire rod for cutting work is more than 2.8, and satisfies the following expressions (3) and (4) in the case where the average aspect ratio is 2.8 or less,
H ave ≤350   (1)

H σ ≤30   (2)

H ave ≤250   (3)

H σ ≤20   (4).

First claim

1 . A wire rod for cutting work, comprising:
a chemical composition containing C: 0.001 mass % to 0.150 mass %, Si: 0.010 mass % or less, Mn: 0.20 mass % to 2.00 mass %, P: 0.02 mass % to 0.15 mass %, S: 0.20 mass % to 0.50 mass %, N: 0.0300 mass % or less, and O: 0.0050 mass % to 0.0300 mass %, with the balance consisting of Fe and inevitable impurities; and Vickers hardness that satisfies the following expressions (1) and (2) in the case where an average aspect ratio of ferrite grains at a position of 1/4 of a diameter from a surface of the wire rod for cutting work is more than 2.8, and satisfies the following expressions (3) and (4) in the case where the average aspect ratio is 2.8 or less,
H ave ≤350   (1)

H σ ≤30   (2)

H ave ≤250   (3)

H 94 ≤20   (4)

where H ave is an average value in a circumferential direction of Vickers hardness at the position of 1/4 of the diameter from the surface, and H, is a standard deviation of Vickers hardness for 100 points at the position of 1/4 of the diameter from the surface.

2 . The wire rod for cutting work according to claim 1 , wherein the chemical composition further contains one or more selected from the group consisting of
Pb: 0.01 mass % to 0.50 mass %, Bi: 0.01 mass % to 0.50 mass %, Ca: 0.01 mass % or less, Se: 0.1 mass % or less, and Te: 0.1 mass % or less.

3 . The wire rod for cutting work according to claim 1 , wherein the chemical composition further contains one or more selected from the group consisting of
Cr: 3.0 mass % or less, Al: 0.010 mass % or less, Sb: 0.010 mass % or less, Sn: 0.010 mass % or less, Cu: 1.0 mass % or less, Ni: 1.0 mass % or less, and Mo: 1.0 mass % or less.

4 . The wire rod for cutting work according to claim 1 , wherein the chemical composition further contains one or more selected from the group consisting of
Nb: 0.050 mass % or less, Ti: 0.050 mass % or less, V: 0.050 mass % or less, Zr: 0.050 mass % or less, W: 0.050 mass % or less, Ta: 0.050 mass % or less, Y: 0.050 mass % or less, Hf: 0.050 mass % or less, and B: 0.050 mass % or less.

5 . The wire rod for cutting work according to claim 2 , wherein the chemical composition further contains one or more selected from the group consisting of
Cr: 3.0 mass % or less, Al: 0.010 mass % or less, Sb: 0.010 mass % or less, Sn: 0.010 mass % or less, Cu: 1.0 mass % or less, Ni: 1.0 mass % or less, and Mo: 1.0 mass % or less.

6 . The wire rod for cutting work according to claim 2 , wherein the chemical composition further contains one or more selected from the group consisting of
Nb: 0.050 mass % or less, Ti: 0.050 mass % or less, V: 0.050 mass % or less, Zr: 0.050 mass % or less, W: 0.050 mass % or less, Ta: 0.050 mass % or less, Y: 0.050 mass % or less, Hf: 0.050 mass % or less, and B: 0.050 mass % or less.

7 . The wire rod for cutting work according to claim 3 , wherein the chemical composition further contains one or more selected from the group consisting of
Nb: 0.050 mass % or less, Ti: 0.050 mass % or less, V: 0.050 mass % or less, Zr: 0.050 mass % or less, W: 0.050 mass % or less, Ta: 0.050 mass % or less, Y: 0.050 mass % or less, Hf: 0.050 mass % or less, and B: 0.050 mass % or less.

8 . The wire rod for cutting work according to claim 5 , wherein the chemical composition further contains one or more selected from the group consisting of
Nb: 0.050 mass % or less, Ti: 0.050 mass % or less, V: 0.050 mass % or less, Zr: 0.050 mass % or less, W: 0.050 mass % or less, Ta: 0.050 mass % or less, Y: 0.050 mass % or less, Hf: 0.050 mass % or less, and B: 0.050 mass % or less.

Assignees

• Jfe Steel Corp

Inventors

• Imanami Yuta
• Fukuoka Kazuaki
• Nishimura Kimihiro

Classifications

• C21D9/085

  Cooling or quenching · CPC title

• C22C38/04 Primary

  containing manganese · CPC title

• C22C38/42

  with copper · CPC title

• C22C38/008

  containing tin · CPC title

• C22C38/14

  containing titanium or zirconium · CPC title