Method for forging 316LN stainless steel forge piece

A 316LN, 1.316LN technology, applied in the field of metallurgical forging technology, can solve the problems of corrosion resistance, low outgassing rate, difficult to achieve, etc., and achieve the effect of improving mechanical strength and reducing Ms point

Inactive Publication Date: 2016-10-26
ANHUI RUIJIE FORGING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 316LN is heat-resistant, corrosion-resistant and non-magnetic stainless steel; it has excellent corrosion resistance, low outgassing rate, non-magnetic, good weldability, high strength, plasticity and toughness, and can be used in the temperature range of -270 ~ 900 ° C Work, often used in the nuclear power industry, but the index of magnetic permeability ≤ 1.2 is always difficult to achieve

Method used

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Embodiment 1

[0011] The forging method of 316LN stainless steel forgings, it may further comprise the steps:

[0012] 1) The chemical composition of 316LN stainless steel is ≤0.03 for C, ≤0.75 for Si, ≤2.0 for Mn, ≤0.03 for S, ≤0.045 for P, 16.0-18.0 for Cr, 2.0-3.0 for Mo, and 10.0-14.0 for Ni , N is ≤0.25;

[0013] 2) Put 316LN stainless steel into the furnace, and the initial forging preheating temperature controls the melting point of 200-300°C. The melting point of 316LN stainless steel forging begins at 1000-1300°C, and the liquid phase transition begins to appear, and the γ bulk phase area is lower than the carbon steel phase area. Narrow, around 850-900 ° C, it begins to transform into austenite to make bars;

[0014] 3) Air cooling at 550°C after forging, hot furnace annealing, heat preservation at 770-790°C, slow cooling with the furnace to below 550°C, and air cooling after forging to eliminate residual internal stress after forging, and obtain fine granular pearlite structure,...

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Abstract

The invention discloses a method for forging a 316LN stainless steel forge piece. The method comprises the following steps of: enabling chemical components of 316LN stainless steel to satisfy the conditions that C is not greater than 0.03, Si is not greater than 0.75, Mn is not greater than 2.0, S is not greater than 0.03, P is not greater than 0.045, Cr is 16.0-18.0, Mo is 2.0-3.0, Hi is 10.0-14.0 and N is not greater than 0.25; placing the 316LN stainless steel into a smelting furnace, wherein an initial forging preheating temperature control melting point is 200-300 DEG C, the liquid phase change begins to occur when the initial forging melting point temperature of the 316LN stainless steel is at 1,000-1,300 DEG C, a gamma bulk phase region is narrower than a low-carbon steel phase region, the 316LN stainless steel begins to convert to austenite stainless steel at the temperature of 850-900 DEG C to be made into bar steel; after forging, air cooling the steel at 550 DEG C, annealing in a hot charging furnace, preserving heat at 770-790 DEG C, then slowly cooling below 550 DEG C along with the furnace, discharging and air cooling, eliminating the forged residual internal stress, obtaining fine granular pearlite structures, and providing structure preparation for final heat-treatment.

Description

technical field [0001] The invention relates to a metallurgical forging process, in particular to a free forging process for a GCr15 bearing ring. Background technique [0002] A nuclear power plant is a new type of power plant that uses the energy stored in the nucleus to generate electricity. The nuclear power plant can be roughly divided into two parts: one is a nuclear island that uses nuclear energy to produce steam, including reactor devices and primary loop systems; the other is a conventional island that uses steam to generate electricity. Including turbo generator system. Among them, my country is a veritable nuclear power. At present, the scale of nuclear power units in operation, construction and construction is the largest in the world. The demand for nuclear power products is large. However, due to the particularity of nuclear power products, the requirements for drawings are lower than ordinary standards (μ≤ 1.2) Magnetic permeability, for example, in some part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/30C22C38/02C22C38/04C22C38/44C22C38/58
CPCC21D1/30C22C38/001C22C38/02C22C38/04C22C38/44C22C38/58Y02P10/20
Inventor 吕美莲刘春超冯宝倪吕俊吕诚
Owner ANHUI RUIJIE FORGING
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