Softening heat treatment process of small-specification 22Si2MnCrNi2MoA rolled steel
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A small-sized, steel-rolled technology, applied in the field of metal heat treatment, can solve problems such as complicated procedures, high energy consumption, and poor effects, and achieve the effect of simple process and easy operation
Inactive Publication Date: 2019-12-10
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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Problems solved by technology
[0006] In order to overcome that the existing metal softening treatment process is not applicable to 22SiMnNi2CrMoA steel, and there are shortcomings such as complicated procedures, poor effect and high energy consumption, the technical problem to be solved by the present invention is: to provide a kind of softening treatment for 22Si2MnCrNi2MoA steel rolled products with simple process heat treatment method
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Embodiment 1
[0027] The softening heat treatment process of Ф85mm 22Si2MnCrNi2MoA steel includes the following steps:
[0028] (1) Rolled products: After the steel ingots are discharged from the furnace, they are transported to the rolling mill for continuous six-pass reversible rolling; the first rolling temperature is 1100°C, the deformation reduction rate of the ingot is 12%, and the second to fifth The rolling temperature of the pass is 1050℃, 1050℃, 1020℃, 1000℃, the deformation reduction rate of the steel ingot is 23%, the rolling temperature of the finished pass is between 930℃~880℃, and the deformation reduction rate of the steel ingot is 5%.
[0029] (2) Complete annealing, place the product of step 1 in an annealing furnace, heat it to 880°C at a heating rate of 100°C / h, keep it for 3 hours, turn off the fire, cool it to 200°C, take it out of the furnace, and cool it to room temperature in air.
[0030] (3) High-temperature tempering, place the product of step 2 in the tempering furnac...
Embodiment 2
[0032] The softening heat treatment process of Ф145mm 22Si2MnCrNi2MoA steel includes the following steps:
[0033] (1) Rolled products: After the steel ingots are released from the furnace, they are transported to the rolling mill for six consecutive reversible rolling passes; the rolling temperature of the first pass is 1100°C, the deformation reduction rate of the ingot is 10%, the second to fifth pass The rolling temperature of the pass is 1050℃, 1050℃, 1020℃, 1000℃, the deformation reduction rate of the steel ingot is 23%, the rolling temperature of the finished pass is between 930℃~880℃, and the deformation reduction rate of the steel ingot is 3%.
[0034] (2) For complete annealing, place the product of step 1 in an annealing furnace, heat it to 880°C at a heating rate of 100°C / h, keep it for 5 hours, turn off the fire, cool to 200°C with the furnace, and leave the furnace in air to room temperature.
[0035] (3) High temperature tempering, place the product of step 2 in the t...
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Abstract
The invention discloses a softening heat treatment process of small-specification 22Si2MnCrNi2MoA rolled steel, and belongs to the field of metal heat treatment. The softening heat treatment process comprises the following steps of a, rolling into products, steel ingots are conveyed to a rolling machine after being discharged, and at least six passes of reversible rolling are carried out continuously; b, full annealing, wherein the products in step a are placed in an annealing furnace and heated to 880+/-10 DEG C, heat preservation is carried out for 3-5 h, then the products is cooled to be lower than or equal to 200 DEG C along with the furnace, and finally the products are subjected to air cooling to reach room temperature; and c, high-temperature tempering, wherein the products in stepb are placed in a tempering furnace and heated to 720+/-10 DEG C, heat preservation is carried out for 20-25 h, then the products are cooled to be lower than or equal to 450 DEG C to be discharged, and the products are subjected to air cooling to reach the room temperature. According to the softening heat treatment process, by means of multi-pass reversible rolling, crystals of the structure are refined, then a softened structure with ferrite+pearlite+a little bainite as a matrix structure can be obtained through the full annealing procedure, and finally a tempered sorbate structure is obtained through the high-temperature tempering procedure; and the hardness value of the steel ranges from 235 HB to 250 HB after final high-temperature tempering, and machining requirements are completely met.
Description
Technical field [0001] The invention relates to the field of metal heat treatment, in particular to a softening heat treatment process for rolled steel of small size 22Si2MnCrNi2MoA. Background technique [0002] 22Si2MnCrNi2MoA is a low-carbon martensitic alloy steel. After rolling, air cooling can obtain a mixed structure of martensite + bainite, which is similar in composition to the Swedish steel number 22SiMnNi2CrMo. It is mainly used for the production of drill rods and drill tails. Because of its higher alloy content, the steel grade has higher strength and hardness after hot working deformation. In order to reduce the hardness and make it easy for cold deformation and mechanical processing, softening heat treatment is required. Traditional products are air-cooled after rolling, and the hardness is distributed between 278HB-297HB after high temperature annealing. The machining is difficult, and the tool wear during the machining process is serious, which increases tool con...
Claims
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Application Information
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