Cast steel for construction equipment bucket parts and parts for construction equipment bucket comprising the same

Patent metadata

Field	Value
Publication number	US-9896823-B2
Application number	US-201414483727-A
Country	US
Kind code	B2
Filing date	Sep 11, 2014
Priority date	Dec 26, 2013
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The present disclosure relates to a cast steel for construction equipment bucket parts and parts for a construction equipment bucket manufactured by using the same, and the cast steel includes 0.27 to 0.34 wt % of carbon (C), 1.2 to 1.8 wt % of chromium (Cr), 0.8 to 1.7 wt % of silicon (Si), 1.0 to 1.4 wt % of manganese (Mn), 0.2 to 0.4 wt % of molybdenum (Mo), 0.2 to 0.4 wt % of nickel (Ni), and a balance of iron and impurities.

First claim

What is claimed is:

1. A cast steel for use with a construction equipment bucket part, comprising greater than 0.30 and less than or equal to 0.34 wt % of carbon (C), 1.2 to 1.8 wt % of chromium (Cr), 0.8 to 1.7 wt % of silicon (Si), 1.0 to 1.4 wt % of manganese (Mn), 0.2 to 0.4 wt % of molybdenum (Mo), 0.2 to 0.4 wt % of nickel (Ni), and a balance of iron and impurities, and
comprising MC carbide and at least one carbide selected from M 7 C 3 carbide, M 3 C 2 carbide and M 23 C 6 carbide in a structure thereof,
wherein the MC carbide is comprised in an amount of 15 to 45 vol % based on a total 100 vol % of the entire carbides.

2. The cast steel of claim 1 , wherein the MC carbide is comprised in crystal particles of the cast steel, and at least one carbide selected from the M 7 C 3 carbide, the M 3 C 2 carbide and the M 23 C 6 carbide is comprised at a boundary of the crystal particles of the cast steel.

3. The cast steel of claim 1 , wherein a total content of the chromium (Cr), silicon (Si) and manganese (Mn) is 4.1 to 4.9 wt %.

4. The cast steel of claim 1 , further comprising 0.01 to 0.03 wt % of vanadium (V).

5. A part for use with a construction equipment bucket obtained by subjecting the cast steel of claim 1 to post-treatment.

6. The part of claim 5 , wherein the part is a tooth, a tooth adapter, a shroud or a cutter.

7. The part of claim 5 , wherein the MC carbide is comprised in crystal particles of the cast steel, and at least one carbide selected from the M 7 C 3 carbide, the M 3 C 2 carbide and the M 23 C 6 carbide is comprised at a boundary of the crystal particles of the cast steel.

8. The part of claim 5 , wherein a total content of the chromium (Cr), silicon (Si) and manganese (Mn) is 4.1 to 4.9 wt %.

9. The part of claim 5 , further comprising 0.01 to 0.03 wt % of vanadium (V).

10. A cast steel for use with a construction equipment bucket part, comprising greater than 0.30 and less than or equal to 0.34 wt % of carbon (C), 1.2 to 1.8 wt % of chromium (Cr), 0.8 to 1.7 wt % of silicon (Si), 1.0 to 1.4 wt % of manganese (Mn), 0.2 to 0.4 wt % of molybdenum (Mo), 0.2 to 0.4 wt % of nickel (Ni), and a balance of iron and impurities, and
comprising MC carbide and at least one carbide selected from M 7 C 3 carbide, M 3 C 2 carbide and M 23 C 6 carbide in a structure thereof,
wherein when a cut surface after cutting of the cast steel is analyzed by an image analyzer, a ratio (b/a) of an area (b) of the MC carbide to an area (a) of the entire carbide is 0.1 to 0.65 at the cut surface, and
wherein the MC carbide is comprised in crystal particles of the cast steel, and at least one carbide selected from the M 7 C 3 carbide, the M 3 C 2 carbide and the M 23 C 6 carbide is comprised at a boundary of the crystal particles of the cast steel.

11. A part for use with a construction equipment bucket obtained by subjecting the cast steel of claim 10 to post-treatment.

12. The part of claim 11 , wherein the part is a tooth, a tooth adapter, a shroud or a cutter.

Assignees

• Doosan Infracore Co Ltd
• Doosan Infracor Co Ltd

Inventors

• Lee Choung Rae
• An Sang Min
• Shim Young Ji
• Song Seok Won
• Shim Dong Seob

Classifications

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• C22C38/46

  with vanadium · CPC title

• C22C38/02

  containing silicon · CPC title

• C22C38/34 Primary

  with more than 1.5% by weight of silicon · CPC title

• C21D9/0068

  for particular articles not mentioned below · CPC title