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A method for grain refinement of austenitic stainless steel forgings

A technology for austenitic stainless steel and grain refinement, applied in the field of grain refinement of austenitic stainless steel forgings, can solve the problem of uneven grain size, achieve uniform grain size, fine grain size, and reduce secondary heating Effect

Active Publication Date: 2019-10-29
无锡市法兰锻造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention provides a method for refining the grains of austenitic stainless steel forgings. By adjusting the parameters of forging and heat treatment, the grains are refined by combining dynamic recrystallization and static recrystallization, which solves the problems caused by the traditional rapid cooling method. The problem of uneven grain size, while effectively improving the quality of austenitic stainless steel

Method used

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  • A method for grain refinement of austenitic stainless steel forgings
  • A method for grain refinement of austenitic stainless steel forgings
  • A method for grain refinement of austenitic stainless steel forgings

Examples

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Effect test

Embodiment 1

[0034] A method for refining the grains of an austenitic stainless steel forging, comprising the following steps:

[0035] S1. Forging:

[0036] Use a 3000-ton hydraulic press to forge 3 tons of F304L stainless steel ingots. The initial forging temperature is 1000°C, and the final forging temperature is 720°C; the deformation rate is 0.01S -1 , the total forging ratio is 3.1, and the last forging ratio is 50% of the total forging ratio;

[0037] S2, heat treatment

[0038] The forged piece obtained in step S1 is heat-treated at 1000° C., the holding time is 1.0 min / mm, and water-cooled after the holding time, to obtain an austenitic stainless steel forging. The prepared austenitic stainless steel forgings were inspected according to the C method in the GB / T4334 standard, and the intergranular corrosion of the austenitic stainless steel forgings was qualified.

Embodiment 2

[0040] A method for refining the grains of an austenitic stainless steel forging, comprising the following steps:

[0041] S1. Forging:

[0042] Use 3000 tons of hydraulic press to forge 1 ton of F304L stainless steel ingot, the initial forging temperature is 1200 ℃, the final forging temperature is 850 ℃; the deformation rate is 0.045S -1 , the total forging ratio is 8, and the last forging ratio is 35% of the total forging ratio;

[0043] S2, heat treatment

[0044] The forged piece obtained in step S1 is heat-treated at 1200° C., the holding time is 2.0 min / mm, and water-cooled after the holding time, to obtain an austenitic stainless steel forging. The prepared austenitic stainless steel forgings were inspected according to the C method in the GB / T4334 standard, and the intergranular corrosion of the austenitic stainless steel forgings was qualified.

Embodiment 3

[0046] A method for refining the grains of an austenitic stainless steel forging, comprising the following steps:

[0047] S1. Forging:

[0048] Use 3000 tons of hydraulic press to forge 2 tons of F304L stainless steel ingots, the initial forging temperature is 1050 ℃, the final forging temperature is 760 ℃; the deformation rate is 0.044S -1 , the total forging ratio is 4, and the last forging ratio is 20% of the total forging ratio;

[0049] S2, heat treatment

[0050] The forged piece obtained in step S1 is heat treated at 1150° C., the holding time is 1.2 min / mm, and water cooled after the holding time, to obtain an austenitic stainless steel forging. The prepared austenitic stainless steel forgings were inspected according to the C method in the GB / T4334 standard, and the intergranular corrosion of the austenitic stainless steel forgings was qualified.

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Abstract

The invention discloses a method for refining grains of austenitic stainless steel forged pieces. The method comprises the following steps of S1, forging and S2, heat treatment, wherein in the step S1, stainless steel ingots are forged, the initial forging temperature for forging is 1,000-1200 DEG C, the final forging temperature is 720-850 DEG C, the deformation rate is 0.01-0.45S<-1>, the totalforging ratio is not less than 3, and the forging ratio of the last fire is not less than 20% of the total forging ratio; and in the step S2, the forged pieces obtained in the step S1 are subjected toheat treatment at 1000-1200 DEG C for 1.0-2.0 min / mm to obtain the austenitic stainless steel forged pieces. Compared with the prior art, the austenite stainless steel forged pieces have more uniformand finer grain and good intergranular corrosion resistance, the tensile strength, the yield strength and the impact work of the austenite stainless steel forged pieces are increased at the same time, and the comprehensive performance of the austenite stainless steel forged pieces is improved.

Description

technical field [0001] The invention belongs to the technical field of forging and heat treatment, and in particular relates to a method for refining grains of an austenitic stainless steel forging. Background technique [0002] Austenitic stainless steel is a solid solution of carbon in γ-Fe, non-magnetic, has high toughness and plasticity, and has very good corrosion resistance. Due to its unique corrosion resistance and ease of processing, austenitic stainless steel has been widely used in petroleum, chemical, medical, environmental protection, food and other industries. [0003] During the formation process of austenitic stainless steel castings, problems such as shrinkage cavity shrinkage, segregation, pores, microcracks, and non-metallic inclusions will occur, which seriously reduce the performance of castings and bring great harm to daily production. Even after post-heat treatment such as complete annealing, these defects will not be completely eliminated. [0004] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00
Inventor 李刚亮石宏亮吴金波邹琪
Owner 无锡市法兰锻造有限公司
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