Low alloyed steel powder

一种钢粉、预合金化的技术，应用在粉末锻造部件领域，能够解决降低压缩屈服强度和硬度等问题

Inactive Publication Date: 2010-12-22
HOGANAS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Reduction of copper and carbon content also results in reduced compressive yield strength and hardness

Method used

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  • Low alloyed steel powder
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preparation example Construction

[0026] Preparation of Iron-based Alloy Steel Powder

[0027] Steel powder is produced by water atomization of a steel melt containing specified amounts of alloying elements. The atomized powder was further subjected to reduction annealing as described in US Patent 6,027,544, which is hereby incorporated by reference. The particle size of the steel powder can be any size as long as it is compatible with pressing and sintering or powder forging methods. Examples of suitable particle sizes are available from AB, Sweden's known powder ABC100.30 has a particle size of about 10% by weight above 150 microns and about 20% by weight below 45 microns.

[0028] Content of steel powder

[0029] Chromium is used to strengthen the matrix by solution hardening. Chromium also improves the hardenability, oxidation resistance and wear resistance of the sintered body. However, a chromium content higher than 1.5% by weight reduces the compressibility of the steel powder and results in le...

Embodiment

[0055] Manufacture of various prealloyed iron-based steel powders by water atomization of steel melts. The resulting green powder was further annealed in a reducing atmosphere followed by gentle grinding to disintegrate the sintered powder mass. The powder particle size is below 150 microns. Table 1 shows the chemical composition of the different powders.

[0056] Table 1

[0057]

[0058] Table 1 shows the chemical compositions of Steel Powders A to J and References 1 to 3.

[0059] The resulting steel powders A to J were mixed with graphite 1651 from Asbury, USA according to the amount specified in Table 2 and 0.8% available from AB, Amide Wax PM Blend, Sweden. To some of this composition was added copper powder Cu-165 from A Cu Powder, USA according to the amounts specified in Table 2.

[0060] As a reference composition, based on the available AB, Iron powder AHC100.29 from Sweden and two iron-copper carbon compositions ref 1 and ref 2 were prepared according to...

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Abstract

A water atomised prealloyed iron-based steel powder which comprises by weight-%: 0.2-1.5 Cr, 0.05-0.4 V, 0.09 -0.6 Mn, less than 0.1 Mo, less than 0.1 Ni, less than 0.2 Cu, less than 0.1 C, less than 0.25 O, less than 0.5 of unavoidable impurities, the balance being iron.

Description

technical field [0001] The present invention relates to low alloyed iron-based powders and powder compositions containing the powders and other additives, and powder forged parts made from the powder compositions. The powder and powder composition are intended for the cost-effective manufacture of powder forged components, such as connecting rods. Background technique [0002] Metal products produced by pressing and sintering metal powder compositions are increasingly used in industry. Manufacture many different products in various shapes and thicknesses, with ever-increasing quality requirements while looking to keep costs down. Due to the compaction and sintering of iron powder compositions to obtain net-shape parts or near-net-shape parts that require only minimal machining to reach the final shape and a high degree of material utilization, this technology greatly outperforms conventional forming techniques for metal parts, For example molded or machined from bar stock ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02B22F3/12B22F3/17B22F9/08
CPCF16C2204/62B22F2998/10C22C33/0207B22F2003/248B22F2999/00C22C33/0264F16C7/02F16C2220/20B22F3/24B22F2201/30B22F3/1007B22F2201/01B22F9/082B22F1/12B22F1/09B22F1/10B22F3/02B22F3/17
Inventor S·本特松A·拉松
Owner HOGANAS AB
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