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Forging production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar

A technology of martensitic stainless steel and high-nitrogen martensite, applied in metal processing equipment, etc., can solve problems such as uneven structure, dependence on imports, poor thermoplasticity, etc., to reduce internal stress damage, reduce forging difficulty, and reduce structural defects Effect

Active Publication Date: 2021-03-16
DEQING TIANMA BEARING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

30Cr15MoN high-nitrogen martensitic stainless steel is a commonly used material for high-precision and cutting-edge national defense construction in my country, but its production technology has been controlled by foreign countries, basically relying on imports, costing a lot, and facing the risk of embargo at any time, so the domestic production of this steel is realized is especially necessary
[0003]30Cr15MoN steel, as a high nitrogen steel, has poor thermoplasticity and is prone to cracking and uneven structure during the forging process. Although the domestic high nitrogen steel forging process There is also some research, but it is still in its infancy and cannot solve the problem well
Considering the temperature control, this method has improved the cracking phenomenon, but its applicability is limited. This patent is designed for ring forgings. If it is to produce bars, it is necessary to add an elongation process. The existing stainless steel bar production The general method is repeated upsetting and elongation, and the elongation adopts square elongation or disordered elongation. In this way, high nitrogen steel bars are produced. Even if the temperature control is optimized, the repeated upsetting and elongation process will easily make the internal stress distribution of the steel Unevenness can also lead to cracking of steel, and it can easily lead to uneven structure and affect the mechanical properties of steel. Therefore, the yield and qualification rate of steel are not high, and forging fires are many times, energy consumption is large, and production efficiency is low.

Method used

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  • Forging production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar
  • Forging production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar
  • Forging production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar

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Embodiment 1

[0029] This embodiment is a preferred embodiment, which provides a forging production process for 30Cr15MoN high nitrogen martensitic stainless steel rods. The 30Cr15MoN high nitrogen martensitic stainless steel includes the following components by mass percentage: C 0.30%, Si0. 65%, Mn 0.45%, P 0.013%, S 0.002%, Cr 15.1%, Ni 0.26%, Mo 1.0%, Cu 0.06%, N 0.38%, the balance is iron and unavoidable impurities; the forging production process described Include the following steps:

[0030] S1. Electroslag remelting: Fill nitrogen until the space pressure reaches above 11Bar, and conduct electroslag remelting on 30Cr15MoN high-nitrogen martensitic stainless steel blanks in the high-pressure nitrogen atmosphere to obtain ￠440mm 30Cr15MoN high-nitrogen martensite Stainless steel round ingot;

[0031] S2. Heating: Preheat the round steel ingot to 700°C first, then keep it warm for 2 hours, heat it to 1220°C at a heating rate not exceeding 80°C / h, and then keep the steel ingot warm for...

Embodiment 2

[0036]A forging production process for 30Cr15MoN high-nitrogen martensitic stainless steel rods, the 30Cr15MoN high-nitrogen martensitic stainless steel includes the following components by mass percentage: C 0.28%, Si 0.30%, Mn 0.30%, P 0.009% , S0.002%, Cr 14.5%, Ni 0.18%, Mo 0.95%, Cu 0.06%, N 0.35%, Al 0.009%, the balance is iron and unavoidable impurities; the forging production process includes the following steps:

[0037] S1. Electroslag remelting: Fill nitrogen until the space pressure reaches above 11Bar, and conduct electroslag remelting on 30Cr15MoN high-nitrogen martensitic stainless steel blanks in the high-pressure nitrogen atmosphere to obtain ￠440mm 30Cr15MoN high-nitrogen martensite Stainless steel round ingot;

[0038] S2. Heating: Preheat the round steel ingot to 700°C first, then keep it warm for 2 hours, heat it to 1100°C at a heating rate not exceeding 80°C / h, and then keep the steel ingot warm for 3 hours;

[0039] S3. Forging preparation: Grinding the...

Embodiment 3

[0043] A forging production process for 30Cr15MoN high-nitrogen martensitic stainless steel rods, the 30Cr15MoN high-nitrogen martensitic stainless steel includes the following components by mass percentage: C 0.34%, Si 0.80%, Mn 0.60%, P 0.02% , S0.01%, Cr 16%, Ni 0.25%, Mo 1.1%, Cu 0.18%, N 0.44%, Al 0.032%, Ti 0.003%, O 0.0020%, the balance is iron and unavoidable impurities; The forging production process includes the following steps:

[0044] S1. Electroslag remelting: Fill nitrogen until the space pressure reaches above 11Bar. In the high-pressure nitrogen atmosphere, the 30Cr15MoN high-nitrogen martensitic stainless steel billet is subjected to electroslag remelting treatment to obtain ￠640mm 30Cr15MoN high-nitrogen martensite Stainless steel round ingot;

[0045] S2. Heating: Preheat the round steel ingot to 700°C first, then keep it warm for 2.5 hours, heat it to 1220°C at a heating rate not exceeding 80°C / h, and then keep the steel ingot warm for 5 hours;

[0046] ...

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Abstract

The invention belongs to the technical field of metal pressure machining processes, and particularly discloses a forging production process of a 30Cr15MoN high-nitrogen martensitic stainless steel bar, which comprises the steps of electroslag remelting, heating, forging preparation, forging and red annealing. According to the method, the problems that 30Cr15MoN steel in an existing forging processis prone to cracking and uneven in structure are effectively solved by combining the optimized forging mode that drawing is directly conducted without upsetting and an eight-edge four-method is adopted for drawing with strict temperature control, meanwhile, the forging heating number is reduced, and the production efficiency is improved; The steel bar forged through the method is excellent in performance in all aspects and can meet the material requirements of high-precision sharp-end projects.

Description

technical field [0001] The invention belongs to the technical field of metal pressure processing technology, and in particular relates to a forging production technology of 30Cr15MoN high-nitrogen martensitic stainless steel rods. Background technique [0002] 30Cr15MoN steel is a high-nitrogen martensitic stainless steel with high strength and hardness, good corrosion resistance, wear resistance and toughness. Because of its excellent performance, it is preferentially used in large aircraft, fighter jets, and aerospace fields. 30Cr15MoN high-nitrogen martensitic stainless steel is a commonly used material for high-precision and cutting-edge national defense construction in my country, but its production technology has been controlled by foreign countries, basically relying on imports, costing a lot, and facing the risk of embargo at any time, so the domestic production of this steel is realized is especially necessary. [0003] As a high nitrogen steel, 30Cr15MoN steel has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06B21J5/06C21D8/06C22B9/18C22C38/00C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/28C22C38/42C22C38/44C22C38/50
CPCB21J1/06B21J5/06C22C38/02C22C38/04C22C38/22C22C38/001C22C38/28C22C38/20C22C38/44C22C38/50C22C38/42C22C38/06C22B9/18C21D8/065C21D2211/008
Inventor 蒋鹏
Owner DEQING TIANMA BEARING CO LTD
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