Heat treatment process for improving hardenability hardness of GCr15SiMn steel tail end
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A technology for end hardenability and hardness, which is applied in the heat treatment process of steel and the heat treatment process for improving the end hardenability and hardness of GCr15SiMn steel, can solve problems such as increasing the production cost of GCr15SiMn steel.
Active Publication Date: 2019-07-30
XINING SPECIAL STEEL +1
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Embodiment 1
[0032] Step1: Normalizing
[0033] Normalize the original steel, specifically:
[0034] Put the original steel into a box-type resistance furnace, normalize at a temperature of 930°C, keep it warm for 50 minutes after reaching the temperature, and cool it down to room temperature quickly by blowing air after it comes out of the furnace.
[0035] Step2: Standard blank sample at the end of machining
[0036] The normalized steel is machined into a Φ25mm terminal standard blank sample.
[0037] Step3: End quenching test
[0038] The end quenching test is carried out on the end standard blank sample of Φ25mm.
Embodiment 2
[0040] Under the condition of not adjusting the chemical composition of GCr15SiMn steel, the heat treatment process for improving the end hardenability hardness of GCr15SiMn steel provided by the present invention is specifically as follows:
[0042] The raw steel is machined into a Φ32mm heat-treated blank sample.
[0043] Considering the sample uniformity, grain size, decarburization, final end standard blank sample size and other factors during the subsequent normalizing and isothermal annealing treatment, we finally decided to machine the original steel into a heat-treated blank sample of Φ32mm.
[0044] Step2: Normalizing
[0045] Perform normalizing treatment on the heat-treated blank sample, specifically:
[0046] Put the heat-treated blank sample into a box-type resistance furnace. The normalizing temperature is 930 ° C. After reaching the temperature, it is kept for 50 minutes.
[0047] Due to the heat treatment...
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Abstract
The invention discloses a heat treatment process for improving the hardenability hardness of a GCr15SiMn steel tail end. The heat treatment process includes the following steps that original steel ismachined into heat treatment blank samples with Phi being 30-35 mm, and the heat treatment blank samples enter a furnace; a normalizing treatment temperature is 930 DEG C, and heat preserving is performed for 50 min after the temperature is achieved; after discharging, air blowing for fast cooling to a room temperature is performed; the samples after normalizing treatment enter the furnace again,temperature rises to 785+/-10 DEG C, heat preserving is performed for 6 h, then cooling is performed at a speed small than or equal to 20 DEG C/h to be 700+/-10 DEG C, and heat preserving is performedfor 2 h; then furnace cooling is performed till 650 DEG C is achieved, and finally discharging for air cooling is performed; and the samples after isothermal annealing treatment are machined into tail end standard blank samples with Phi being 25 mm, and the tail end standard blank samples with Phi being 25 mm are subjected to an end quenching test. The heat treatment process has the beneficial effects that under the condition that chemical components of the steel are not adjusted, the GCr15SiMn steel tail end hardenability hardness is improved, the production cost of GCr15SiMn steel is not increased, and certain advantages are achieved in the aspects of energy saving and cost lowering.
Description
technical field [0001] The invention relates to a heat treatment process for steel, in particular to a heat treatment process for increasing the hardenability hardness at the end of GCr15SiMn steel, and belongs to the technical field of metal heat treatment. Background technique [0002] GCr15SiMn steel is a high-carbon, high-chromium bearing steel with high compressive strength and fatigue limit, high hardness, good wear resistance and hardenability, and certain toughness. It is often used to manufacture wall thickness greater than 12mm, outer diameter Bearing rings not smaller than 250mm. [0003] In order to evaluate whether the quality of GCr15SiMn steel meets the standard requirements, it is necessary to test the end hardenability hardness of GCr15SiMn steel. Among them, the end hardenability hardness value of point J15 requires 58~64HRC, and the end hardenability hardness value of point J20 requires 42~55HRC. [0004] At present, the heat treatment process commonly u...
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