A high-strength and high-toughness large martensitic stainless steel ring forging and its manufacturing method

A martensitic stainless steel, manufacturing method technology, applied in the direction of manufacturing tools, furnace types, engine components, etc., can solve the problems of unstable impact energy, cracking, etc., to shorten the production cycle and manufacturing costs, improve stability, and optimize chemistry The effect of ingredients

Active Publication Date: 2022-04-22
AVIC EXCELLENCE FORGING WUXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above problems, the present invention provides a high-strength and high-toughness large-scale martensitic stainless steel ring forging and its manufacturing met

Method used

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  • A high-strength and high-toughness large martensitic stainless steel ring forging and its manufacturing method
  • A high-strength and high-toughness large martensitic stainless steel ring forging and its manufacturing method
  • A high-strength and high-toughness large martensitic stainless steel ring forging and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A high-strength and high-toughness large-scale martensitic stainless steel ring forging, in terms of weight percentage, the chemical composition of the martensitic stainless steel includes C: 0.22%, Mn: 0.975%, P: 0.015%, S: 0.020%, Si: 0.001%, Cr: 15%, Mo: 0.10%, Ni: 2.5%, Cu: 0.10%, V: 0.005%, Nb: 0.025%, Ti: 0.020%, and the balance is Fe; at the same time, the gas composition meets : H: 1.5ppm, O: 40ppm, N: 200ppm.

[0052] The preparation method of the high-strength and high-toughness large-scale martensitic stainless steel ring forging is: it includes the following process steps,

[0053] Step 1, using the process of EAF+AOD to make the raw materials in the above parts by weight into steel ingots;

[0054] Step 2, forging the steel ingot to obtain a ring-shaped blank forging;

[0055] Step 3, then performing pre-forging heat treatment on the ring-shaped blank forging;

[0056] Step 4, performing mechanical rough machining and flaw detection on the ring forging t...

Embodiment 2

[0071] A high-strength and high-toughness large-scale martensitic stainless steel ring forging, in terms of weight percentage, the chemical composition of the martensitic stainless steel includes C: 0.14%, Mn: 1.5%, P: 0.030%, S: 0.010%, Si: 0.60%, Cr: 15.25%, Mo: 0.0020%, Ni: 2.25%, Cu: 0.001%, V: 0.05%, Nb: 0.010%, Ti: 0.0020%, and the balance is Fe; at the same time, the gas composition meets : H: 0.03ppm, O: 20ppm, N: 300ppm.

[0072] The preparation method of the high-strength and high-toughness large-scale martensitic stainless steel ring forging is: it includes the following process steps,

[0073] Step 1, using the process of EAF+AOD to make the raw materials in the above parts by weight into steel ingots;

[0074] Step 2, forging the steel ingot to obtain a ring-shaped blank forging;

[0075] Step 3, then performing pre-forging heat treatment on the ring-shaped blank forging;

[0076] Step 4, performing mechanical rough machining and flaw detection on the ring forg...

Embodiment 3

[0094] A high-strength and high-toughness large-scale martensitic stainless steel ring forging, in terms of weight percentage, the chemical composition of the martensitic stainless steel includes C: 0.18%, Mn: 0.45%, P: 0.002%, S: 0.003%, Si: 0.030%, Cr: 15.5%, Mo: 0.20%, Ni: 2.0%, Cu: 0.20%, V: 0.10%, Nb: 0.050%, Ti: 0.010%, and the balance is Fe; at the same time, the gas composition meets : H: 3ppm, O: 5ppm, N: 400ppm.

[0095] The preparation method of the high-strength and high-toughness large-scale martensitic stainless steel ring forging is: it includes the following process steps,

[0096] Step 1, using the process of EAF+AOD to make the raw materials in the above parts by weight into steel ingots;

[0097] Step 2, forging the steel ingot to obtain a ring-shaped blank forging;

[0098] Step 3, then performing pre-forging heat treatment on the ring-shaped blank forging;

[0099] Step 4, performing mechanical rough machining and flaw detection on the ring forging that...

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Abstract

The invention provides a high-strength and high-toughness large-scale martensitic stainless steel ring forging. In terms of weight percentage, the martensitic stainless steel includes C: 0.14-0.22%, Mn: 0.45-1.5%, and P: ≤0.030% , S: ≤0.020%, Si: ≤0.60%, Cr: 15~15.5%, Mo: ≤0.20%, Ni: 2.0~2.5%, Cu: ≤0.20%, V: ≤0.10%, Nb: ≤0.050% , Ti: ≤0.020%, and the balance is Fe; at the same time, the gas composition meets: H: ≤3ppm, O: ≤40ppm, N: 200-400ppm; the corresponding manufacturing method, the steel ingot is passed through the cold saw nozzle, the riser, the heat Cut the riser, then perform three upsetting and two pulling, horse frame reaming, ring rolling, preliminary heat treatment, rough turning, quenching and tempering, body sampling, physical and chemical testing, and processing according to the drawing. The invention can solve the problems that large-scale ring forgings produced by adopting the martensitic stainless steel X17CrNi16-2 are prone to cracking after forging and unstable impact energy.

Description

technical field [0001] The invention relates to the field of manufacturing martensitic stainless steel forgings, in particular to a high-strength and high-toughness large martensitic stainless steel ring forging and a manufacturing method thereof. Background technique [0002] Martensitic stainless steel X17CrNi16-2 is the material in the European standard EN10250-4, its QT800 mechanical properties meet the tensile strength: 800 ~ 950Mpa, yield strength: ≥600Mpa, elongation: ≥10%, impact energy (Akv) ≥20J , Widely used in aviation, hydropower, ships, petroleum, valves and machinery and other industrial fields. [0003] The X17CrNi16-2 material is a hard-to-deform steel, because its microstructure not only contains martensite, but also a small amount of ferrite, and if the initial forging temperature of this material is too high during thermal processing, it is not only prone to overheating, but also prone to deformation. Excessive delta ferrite is produced, which further re...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D1/26C21D6/00C21D8/00C21D9/40B21K1/76
CPCC22C38/04C22C38/02C22C38/002C22C38/44C22C38/42C22C38/46C22C38/48C22C38/50C22C38/001C21D9/40C21D6/004C21D6/005C21D6/008C21D1/26C21D8/005B21K1/761
Inventor 郭亮沈志远李少雨李松强邓伟吕洪良
Owner AVIC EXCELLENCE FORGING WUXI
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