A method of manufacturing a stainless steel product

A technology of duplex stainless steel and products, applied in manufacturing tools, cleaning equipment for metal extrusion, metal extrusion, etc., can solve problems such as high tooling, fracture, wear, etc.

Inactive Publication Date: 2012-11-14
SANDVIK INTPROP AB
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Because of the special properties of duplex stainless steel wire, such as its high mechanical strength and its combination of austenite and ferrite, however it turns out that it is difficult to regulate the peeling process so that it can be included in the production route of duplex stainless steel wire
The ferritic phase tends to stick to the trimming dies while the austenitic phase is tough and hard which results in high tool wear and poor chip breakage

Method used

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  • A method of manufacturing a stainless steel product
  • A method of manufacturing a stainless steel product
  • A method of manufacturing a stainless steel product

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Embodiment Construction

[0010] The raw material for the process of making the inventive peeled duplex stainless steel wire product, hereinafter also referred to as peeled duplex stainless steel wire product, is duplex stainless steel wire with a diameter of 5.5-12 mm, which may be annealed or not. Annealing generally produces larger grain sizes and softer materials. However, the effect is negligible for duplex stainless steel wire and therefore both materials can be used.

[0011] Manufacturing method of the present invention comprises the following steps:

[0012] • The wire surface is preferably roughened by pickling in hydrochloric acid, especially if there is scale on the wire surface resulting from annealing. This can be combined with a stronger pickling using a salt bath furnace and a secondary pickling. However, as an alternative to pickling, mechanical roughening is also possible.

[0013] • Apply a washcoat, preferably sodium borate hydrate, on the wire surface.

[0014] ●Peel off the su...

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Abstract

The present invention relates to a method of manufacturing a duplex stainless steel wire product starting from wire rod, the method comprising the following steps: roughening the wire rod surface; applying a carrier coating on the wire rod surface; peeling the wire rod using a shaving die comprising cemented carbide; roughening the wire rod surface; applying a carrier coating on the wire rod surface; and drawing to final wire dimension. In the peeling step, the shaving die used has a rake face land angle eta which is 10-30 DEG , a rake angle gamma which is 10-25 DEG , a clearance angle alpha which is 3-10 DEG , a rake face land width w which is 0.1-0.5 mm, and an edge radius which is 0.02-0.08 mm. The duplex stainless steel wire product manufactured according to the method exhibits excellent fatigue resistance.

Description

technical field [0001] The present invention relates to a method of making a duplex stainless steel wire product. Background technique [0002] Duplex stainless steel alloys have a microstructure consisting of approximately 45 to 65% austenite and 35 to 55% ferrite. The duplex structure inhibits grain growth and thus the fine grain size contributes to the very high strength of duplex stainless steel alloys. Duplex stainless steel wire products are known to have excellent corrosion resistance and high mechanical strength combined with good fatigue resistance properties compared to austenitic stainless steel wire products and are therefore suitable for spring applications in eg seawater applications. [0003] The production line for duplex stainless steel wire products starts with wire rods, annealed or not, with a diameter of 5.5-1.2 mm. The wire is pickled in hydrochloric acid to remove scale, and a carrier, usually sodium hydrate, is applied to the wire surface to facilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23D79/12B21C43/00B21C37/04
CPCB21C43/00B21C37/045B23D79/12B21C37/04
Inventor 佩尔-奥洛夫·斯特兰德安德斯·瑟德曼
Owner SANDVIK INTPROP AB
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