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Method capable of prolonging service life of welded steel balls
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A steel ball and life technology, applied in the field of heat treatment, can solve problems such as cracking and scrapping, and achieve the effect of prolonging the service life, good comprehensive mechanical properties, and avoiding scrapping
Inactive Publication Date: 2019-02-19
JIANGSU HUAHAI STEEL STRUCTURE CO LTD
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Abstract
Description
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Embodiment 1
[0020] The method for improving the service life of welded steel balls includes the following steps:
[0021] Step 1: Weld the two hemispheres into a complete steel ball 1 by means of submerged arc welding;
[0022] Step 2: Suspend a horizontal support 3 through the vertical telescopic rod 2, and install a steel ball 1 at both ends of the horizontal support 3;
[0023] Step 3: extend the vertical telescopic rod 2 downwards, place the steel ball 1 on the heating furnace 4 for heating, raise the temperature to 750°C, and keep it warm for 1 hour;
[0024] Step 4: Lower the temperature of steel ball 1 to 650°C, keep it warm for 20 minutes, and air-cool to room temperature;
[0025] Step 5: Perform low-temperature tempering on the steel ball 1, the low-temperature tempering temperature is 300° C., keep it warm for 4 hours, and air-cool to room temperature.
[0026] Step 6: After the heat treatment of the steel ball 1 at one end is completed, the vertical telescopic rod 2 is retra...
Embodiment 2
[0028] The method for improving the service life of welded steel balls includes the following steps:
[0029] Step 1: Weld the two hemispheres into a complete steel ball 1 by means of submerged arc welding;
[0030] Step 2: Suspend a horizontal support 3 through the vertical telescopic rod 2, and install a steel ball 1 at both ends of the horizontal support 3;
[0031] Step 3: Preheat the steel ball 1 twice, the first preheating temperature is 350°C, and the holding time is 0.5h; the second preheating temperature is 450°C, and the holding time is 20min; Stretch out, place the steel ball 1 on the heating furnace 4 to heat, raise the temperature to 750°C, and keep it warm for 0.5h;
[0032] Step 4: Lower the temperature of the steel ball 1 to 680°C, keep it warm for 25 minutes, and air-cool to room temperature;
[0033] Step 5: Perform low-temperature tempering on the steel ball 1, the low-temperature tempering temperature is 350°C, keep warm for 3.5 hours, and air-cool to roo...
Embodiment 3
[0036] The method for improving the service life of welded steel balls includes the following steps:
[0037] Step 1: Weld the two hemispheres into a complete steel ball 1 by means of submerged arc welding;
[0038] Step 2: Suspend a horizontal support 3 through the vertical telescopic rod 2, and install a steel ball 1 at both ends of the horizontal support 3;
[0039] Step 3: Preheat the steel ball 1 twice, the first preheating temperature is 400°C, and the holding time is 0.5h; the second preheating temperature is 550°C, and the holding time is 15min; then the vertical telescopic rod 2 Stretch out downwards, place the steel ball 1 on the heating furnace 4 to heat, raise the temperature to 700°C, and keep it warm for 0.5h;
[0040] Step 4: Lower the temperature of steel ball 1 to 650°C, keep it warm for 20 minutes, and air-cool to room temperature;
[0041] Step 5: Perform low-temperature tempering on the steel ball 1, the low-temperature tempering temperature is 350° C., k...
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Abstract
The invention discloses a method capable of prolonging the service life of welded steel balls. The method capable of prolonging the service life of the welded steel balls comprises the following stepsthat every two semi-balls are welded to form a complete steel ball by adopting a submerged-arc welding mode; a horizontal bracket is suspended through a perpendicular telescopic rod, and steel ballsare correspondingly mounted at the two ends of the horizontal bracket; the perpendicular telescopic rod extends out downwards, so that the steel balls are placed on a heating furnace for heating; andafter heating treatment is carried out on the steel ball at one end, the perpendicular telescopic rod retracts back to pull up the horizontal bracket and the horizontal bracket is enabled to rotate taking the axis of the perpendicular telescopic rod as a center, so that the steel ball at the other end is moved above the heating furnace, and the steel ball at the other end is treated after the horizontal bracket is reduced. The heating treatment enables products to warm up to the appropriate temperature, the hardness of the steel balls can be effectively improved, meanwhile, residual stress generated by welding is released, and the service life of the welded steel ball is prolonged; and good toughness and corrosion resistance performances can be obtained after low-temperature tempering, andfinally, the products can be enabled to obtain good comprehensive performances.
Description
technical field [0001] The invention relates to a heat treatment method, in particular to a method capable of improving the service life of welded steel balls, which belongs to the metalprocessing technology. Background technique [0002] Low carbon steel is widely used in various industries. It is often used to manufacture chains, rivets, bolts, shafts, etc. Because of its low strength, low hardness and softness, it is also called mild steel. The annealed structure of low carbon steel is ferrite and a small amount of pearlite, so it has the characteristics of low strength and hardness, good plasticity and toughness. [0003] Low-alloy high-strength structural steel is made by adding a small amount of alloying elements on the basis of low-carbon steel, which has good welding performance, plasticity, toughness and processability, high strength and low cold-brittle critical transition temperature. Its brand representation method is basically the same as that of carbon struct...
Claims
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Application Information
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