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Manufacturing method of 1cr11ni2w2mov heat-resistant steel forgings for fasteners
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A 1cr11ni2w2mov, manufacturing method technology, applied in the field of heat-resistant steel production and manufacturing, can solve the problems of deformation process control points not explained in detail, easy to produce cracks, etc., and achieve the effects of reducing production costs, improving effects, and stabilizing performance
Active Publication Date: 2022-05-24
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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Problems solved by technology
Therefore, martensitic stainless steel must obtain the desired structure through forging and achieve the ideal performance requirements after annealing to relieve stress. However, the existing martensitic stainless steel is mainly prone to cracks during the forging process.
And the existing technology only expounds the influence of the forging temperature and heat treatment temperature on the mechanical properties of the steel billet in the forging process, and does not elaborate on the specific upsetting and elongation process of the forged steel billet, as well as the control points in the deformation process
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Embodiment 1
[0045] The 1Cr11Ni2W2MoV heat-resistant steel billet for fasteners with a diameter of 550 mm produced by the method includes the steps of smelting, electroslag remelting, forging, and annealing heat treatment.
[0046] The method obtains a Φ730mm steel billet after smelting and electroslag remelting, and the chemical composition of the billet by weight is: C: 0.14, Si: 0.40, Mn: 0.35, Cr: 11.50, Ni: 1.55, W: 1.70, Mo : 0.40, V: 0.22 and the balance of Fe and inevitable impurities.
[0047] Forging: The forging of the present invention adopts two light and one heavy, and direct drawing and forming process. Using two upsetting and two drawing (+FM method) to form the material, the opening forging temperature is 1100 °C, and the final forging temperature is 900 °C. The upsetting adopts the upper and lower arc trays, and the drawing length adopts the upper and lower 500mm flat anvils for forging. The upsetting height is H 0 / 2(H 0 is the original height of the steel ingot), le...
Embodiment 2
[0051] The 1Cr11Ni2W2MoV heat-resistant steel billet for fasteners with a diameter of 600 mm produced by the method includes the steps of smelting, electroslag remelting, forging, and annealing heat treatment.
[0052] The method obtains a Φ730mm steel billet after smelting and electroslag remelting, and the chemical composition of the billet by weight is: C: 0.14, Si: 0.40, Mn: 0.35, Cr: 11.50, Ni: 1.55, W: 1.70, Mo : 0.40, V: 0.22 and the balance of Fe and inevitable impurities.
[0053] Forging: The forging of the present invention adopts two light and one heavy, and direct drawing and forming process. Using two upsetting and two drawing (+FM method) to form the material, the opening forging temperature is 1150 °C, and the final forging temperature is 950 °C. The upsetting adopts the upper and lower arc trays, and the drawing length adopts the upper and lower 500mm flat anvils for forging. The upsetting height is H 0 2 / 3(H 0 is the original height of the steel ingot), l...
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Abstract
The invention relates to a manufacturing method of 1Cr11Ni2W2MoV heat-resistant steel forgings for fasteners, which includes a forging process, the steps of which are: a. heating the billet to 1100 to 1300 °C; b. upsetting the billet to a height H≥H 0 / 2, and then extended to length L≥L 0 , return the drawn steel billet to the furnace for 2 to 4 hours; c, take the returned steel billet out of the furnace and upsetting until H≥H 0 / 2, and then extended to length L=L 0 , temper the drawn steel billet again for 2 to 4 hours; d, take the returned steel billet out of the furnace and then draw it to the length of the finished forging; where H 0 is the original height of billet, L 0 is the original length of the billet. This method adopts two upsetting and two drawing (+FM method) to form a material. The steel billet after forging has no quality defects such as cracks, and the qualified rate of flaw detection is over 95%. It is stable and meets the requirements of steel billets for fasteners. The method solves the problem that the existing martensitic stainless steel is prone to cracking in the forging process.
Description
technical field [0001] The invention relates to a manufacturing method of a 1Cr11Ni2W2MoV heat-resistant steel forging for fasteners, and belongs to the technical field of heat-resistant steel production and manufacture. Background technique [0002] Fasteners are called "the rice of industry" and are one of the most widely used basic parts. It is an important connection node for transmitting loads, and its reliability is closely related to the safe and reliable operation of the entire equipment or structure. With the continuous improvement of steam parameters of steam turbines, the high temperature bolts of steam turbines are required to be made of materials with higher operating temperatures. The traditional superalloy has the disadvantages of high thermal expansion coefficient and high notch sensitivity, and is not suitable for the manufacture of high temperature bolt materials for steam turbines. Considering factors such as mechanical properties and cost, the good 12% ...
Claims
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Application Information
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