Method for forging 316LN stainless steel forge piece

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...

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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