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Roll forming method for Martensite stainless steel large-sized thin-wall ring part

A martensitic stainless steel, ring-shaped technology, applied in the direction of metal rolling, metal rolling, furnace type, etc., can solve problems such as affecting product quality

Active Publication Date: 2013-12-11
GUIZHOU ANDA AVIATION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional method (that is, the production method of "cutting → heating → billet → heating → forming → stack cooling") rolling 0Cr17Ni4Cu4Nb large thin-walled ring forgings will appear forging cracks in the sharp corners, outer diameters, etc., and the cracks are mostly saw. Mouth shape, the crack length is more than 50mm, and the depth is more than 10mm, which seriously affects the quality of the product

Method used

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  • Roll forming method for Martensite stainless steel large-sized thin-wall ring part
  • Roll forming method for Martensite stainless steel large-sized thin-wall ring part

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Embodiment Construction

[0015] The material grade of the martensitic stainless steel required to implement the present invention is 0Cr17Ni4Cu4Nb, and the main chemical element content (weight percentage) of the material is: C content ≤ 0.07, Mn content ≤ 1.00, Si content ≤ 1.00, Cr content 15.50-17.50, Ni 3.00-5.00, Cu 3.00-5.00, Nb 0.15-0.45, S ≤ 0.030, p ≤ 0.035, and the rest is Fe.

[0016] The rolling method of the large-scale thin-walled annular part of martensitic stainless steel described in this invention, its concrete steps are as follows:

[0017] 1. Cutting. Cut according to certain specifications.

[0018] 2. Car micro cracks. The micro-cracks existing on the 0Cr17Ni4Cu4Nb alloy bar are removed by turning, and the turning amount of each pass is 0.01mm-0.02mm, until no micro-cracks can be seen at all.

[0019] 3. Blank making. according to figure 1 For the curve shown, first heat to 850°C for preheating, the preheating and holding time is: the effective thickness of the bar × (0.6 ~ ...

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Abstract

The invention discloses a roll forming method for a Martensite stainless steel large-sized thin-wall ring part. The method comprises the following steps: 1, blanking, 2, turning micro-cracks, 3, heating, 4, blank forming, 5, melting down and heating, 6, performing stack cooling in a furnace, 7, turning micro-cracks, 8, heating, 9, performing roll forming, 10, melting down and heating, and 11, performing stack cooling in the furnace. According to the roll forming method for the Martensite stainless steel large-sized thin-wall ring part in which turning of micro-cracks before forging, melting down and heating after forging and stack cooling in the furnace are adopted, the Martensite stainless steel large-sized thin-wall ring part can be effectively prevented from being discarded due to cracks.

Description

technical field [0001] The invention relates to a plastic forming method, in particular to a rolling method of a martensitic stainless steel large thin-walled annular piece. Background technique [0002] The rolling forming of the ring is to heat the alloy material to the plastic temperature range and make the ring through continuous and uniform rolling deformation, that is, the ring blank is installed on the rolling machine for rolling to produce inner hole expansion and wall thickness. Continuous local plastic deformation with decreasing and increasing outer diameter. [0003] The forging temperature range of martensitic sinking stainless steel is very narrow. For example, the forging temperature range of martensitic stainless steel with material grade 0Cr17Ni4Cu4Nb is generally only 200 ° C to 300 ° C. The conventional method (that is, the production method of "cutting→heating→blank making→heating→forming→stack cooling") rolling 0Cr17Ni4Cu4Nb large thin-walled ring forgi...

Claims

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Application Information

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IPC IPC(8): B21B15/00C21D8/00C21D9/40
Inventor 徐东邱伟苏海邓远翔成陆祥雷静越邹善垚任腾飞
Owner GUIZHOU ANDA AVIATION FORGING