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Roll forming method of large thin-walled ring parts of martensitic stainless steel
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A technology of martensitic stainless steel and ring parts, which is applied in the direction of metal rolling, metal rolling, furnace type, etc., and can solve problems affecting product quality, etc.
Active Publication Date: 2015-07-29
GUIZHOU ANDA AVIATION FORGING
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The conventional method (i.e. adopting the production method of "cutting→heating→blank making→heating→forming→stack cooling") rolling 0Cr17Ni4Cu4Nb large thin-walled ring forgings will have forging cracks in the sharp corners, outer diameter and other parts, 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
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[0019] The material grade of the martensitic stainless steel that needs to be used for implementing the present invention is 0Cr17Ni4Cu4Nb, and the main chemical element content (weight percentage) of this material is: containing C content≤0.07, containing Mn content≤1.00, containing Si content≤1.00, containing Cr 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.
[0020] 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:
[0021] 1. Cutting. Cut according to certain specifications.
[0022] 2. Car micro cracks. The micro-cracks existing on the 0Cr17Ni4Cu4Nb martensitic stainless steel bar are removed by turning, and the turning amount of each pass is 0.01mm to 0.02mm, until no micro-cracks can be seen at all.
[0023] 3. Blank making. according to figure 1 For the curve shown, first heat to 850°C for preheating, the pre...
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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 (i.e. adopting the production method of "cutting→heating→blank making→heating→forming→stack cooling") rolling 0Cr17Ni4Cu4Nb large thin-walled ring ...
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