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Manufacturing method of 1Cr11Ni2W2MoV heat-resistant steel forge piece for fastener

A technology of 1cr11ni2w2mov and a manufacturing method, which is applied in the field of heat-resistant steel production and manufacturing, can solve the problems that the deformation process control points are not elaborated in detail, and are prone to cracks, and achieve the effects of reducing production costs, improving effects and stable performance.

Active Publication Date: 2021-07-13
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The 1Cr11Ni2W2MoV heat-resistant steel billet for fasteners of Φ550mm produced by the method includes steps of smelting, electroslag remelting, forging, and annealing heat treatment.

[0046] The Φ730mm steel slab obtained by the method through smelting and electroslag remelting, the chemical composition of the steel slab 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 unavoidable impurities.

[0047] Forging: the forging of the present invention adopts two light and one heavy, direct elongation forming process. Two upsetting and two drawing (+FM method) are used to form a material, the starting forging temperature is 1100 ℃, and the final forging temperature is 900 ℃. Upsetting adopts upper and lower arc-shaped pallets, and upsetting adopts upper and lower 500mm flat anvil forging. The upsetting height is H 0 / 2(H 0 is the original height of the steel ingot), stretched to L 0 (L 0 is the original length ...

Embodiment 2

[0051] The 1Cr11Ni2W2MoV heat-resistant steel billet for Φ600mm fasteners produced by the method includes steps of smelting, electroslag remelting, forging, and annealing heat treatment.

[0052] The Φ730mm steel slab obtained by the method through smelting and electroslag remelting, the chemical composition of the steel slab 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 unavoidable impurities.

[0053] Forging: the forging of the present invention adopts two light and one heavy, direct elongation forming process. Two upsetting and two drawing (+FM method) are used to form a material, the starting forging temperature is 1150°C, and the final forging temperature is 950°C. Upsetting adopts upper and lower arc-shaped pallets, and upsetting adopts upper and lower 500mm flat anvil forging. The upsetting height is H 0 2 / 3(H 0 is the original height of the steel ingot), stretched to L 0 (L 0 is the original length of...

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PUM

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Abstract

The invention relates to a manufacturing method of a 1Cr11Ni2W2MoV heat-resistant steel forge piece for a fastener. The manufacturing method of the 1Cr11Ni2W2MoV heat-resistant steel forge piece for the fastener comprises a forging process which comprises the following steps of: a, heating a steel billet to 1100 to 1300 DEG C; b, upsetting the steel billet till the height H is larger than or equal to H0 / 2, then drawing out the steel billet till the length L is larger than or equal to L0, and returning the drawn-out steel billet to a furnace for heat preservation for 2 to 4 hours; c, discharging the returned steel billet out of the furnace, then upsetting the steel billet till H is larger than or equal to H0 / 2, then drawing out the steel billet till the length L is equal to L0, and retempering and conducting heat preservation for the drawn-out steel billet for 2 to 4 hours; and d, discharging the returned steel billet out of the furnace and then drawing out the steel billet to the length of a finished forge piece, wherein H0 is the original height of the steel billet, and L0 is the original length of the steel billet. According to the method, a two-upsetting and two-drawing (+ FM method) is adopted for forming, the forged steel billet does not have quality defects such as cracking, the flaw detection qualification rate reaches 95 percent or above, the brinell hardness value of the forge piece subjected to annealing heat treatment is smaller than or equal to 260, the steel billet performance is stable, and the requirements of steel billets for fasteners are met. The problem that existing martensitic stainless steel is prone to cracking in the forging process is solved.

Description

technical field [0001] The invention relates to a method for manufacturing 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 transferring loads, and its reliability is closely related to the safe and reliable operation of the entire equipment or structure. With the continuous improvement of the steam parameters of the steam turbine, the high-temperature bolts of the steam turbine are required to be made of materials with higher operating temperatures. Traditional superalloys have disadvantages such as high thermal expansion coefficient and high notch sensitivity, so they are not suitable for manufacturing high-temperature bolt materials for steam turbines. Considering factors such as mechanical properties and cost, the...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/26C21D6/00C21D8/00C21D9/00C22C33/04C22C38/02C22C38/04C22C38/44C22C38/46B21J1/06B21J5/08
CPCC21D1/18C21D6/004C21D6/005C21D6/008C21D1/26C21D8/005C21D9/0081C22C33/04C22C38/02C22C38/04C22C38/44C22C38/46B21J5/08B21J1/06
Inventor 涂露寒张军赵中清尹凤先
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD