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High-strength martensite PH stainless steel material and preparation method thereof

A precipitation hardening type, martensitic technology, applied in the field of stainless steel materials, can solve the problems of complex composition, high cost, strength and toughness to be improved, etc., to achieve the effect of simple composition and improved performance

Active Publication Date: 2016-11-09
SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent application number 201310276087.0, patent name: precipitation hardening martensitic stainless steel, steam turbine moving blade and steam turbine, discloses the martensitic stainless steel used as steam turbine moving blade, its mechanical properties at room temperature: tensile strength is 1500-1523MPa; Charpy The absorption energy is 40J-85J. Although its mechanical properties can basically meet the requirements of being used as steam turbine blades, the composition of the martensitic stainless steel material is relatively complicated, containing more than ten kinds of metal elements, and the cost is high. Moreover, its strength There is still a lot of room for improvement
Patent application number 201410717711.0, patent name: a rare earth type 0Cr17Ni4Cu4Nb martensitic precipitation hardening stainless steel and its preparation method, also discloses a martensitic stainless steel material, the patent still has the problem of relatively complex composition, its strength and toughness are also needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0022] The heat-resistant steel materials used for steam turbine blades were prepared by using different contents of elements. A total of 5 different formulations were used. The composition of each element is shown in Table 1. The balance in Table 1 is Fe, which is 100% in total. Table 1 Among them, all are mass percent content values; in each embodiment, the impurity content is: Si≤0.10 P≤0.010 S≤0.008;

[0023] The composition of various elements in the table 1 embodiment 1-5

[0024]

C

Cr

Ni

Mo

Al

Example 1

0.050

12.25

7.50

2.00

0.90

Example 2

0.040

13.25

8.50

2.50

1.35

Example 3

0.035

13.05

8.00

2.25

1.15

Example 4

0.020

12.75

7.85

2.15

0.95

Example 5

0.015

12.90

8.25

2.35

1.25

[0025] Include steps:

[0026] (1) Melt the required elements in a vacuum induction furnace at a melting temperature of 1560~1580°C; adjust the content of e...

Embodiment 6

[0039] Material Performance Testing

[0040] With the steel bar that embodiment 1-5 makes, carry out mechanical performance test, comprise room temperature lateral tensile test, room temperature longitudinal tensile test, the results are shown in Table 2 and Table 3 respectively

[0041] Table 2 Room temperature (25°C) transverse stretching:

[0042] parameter

[0043] Table 3 Longitudinal stretch at room temperature (25°C):

[0044] parameter

[0045] The results show that it has excellent strength and toughness properties.

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Abstract

The invention discloses a high-strength martensite PH stainless steel material, and belongs to the field of martensite stainless steel materials. The high-strength martensite PH stainless steel material is prepared from, by weight, 0.05% of C or less, 12.25%-13.25% of Cr, 7.50%-8.50% of Ni, 2.00%-2.50% of Mo, 0.90%-1.35% of Al and the balance Fe. The invention further discloses a preparation method of the stainless steel material. The components of the material are improved and simpler, a proper amount of Cr, Ni, Mo and Al is added, the novel preparation method is adopted, indoor temperature performance:tensile strength Rm is larger than or equal to 1,560 Mpa, and the yield strength Rp0.2 is larger than or equal to 1,460 Mpa; the transverse tensile elongation A is larger than or equal to 10.0%, the percentage reduction Z of area is larger than or equal to 45.0%, and the impulse test Aku is larger than or equal to 39 J; the longitudinal tensile elongation A is larger than or equal to 10.0%, the percentage reduction Z of area is larger than or equal to 35.0%, and the impulse test Aku is larger than or equal to 23 J; the performance of the martensite PH stainless steel material is obviously improved, and the needs of aerospace materials are met.

Description

technical field [0001] The invention relates to a stainless steel material, in particular to a high-strength martensitic precipitation-hardening stainless steel material and a preparation method thereof. Background technique [0002] Martensitic precipitation hardening stainless steel generally refers to a martensitic stainless steel with a carbon content of less than 0.1%, which is further strengthened by adding elements such as copper, molybdenum, titanium, and aluminum to precipitate carbides and intermetallic compounds. Martensitic precipitation hardening stainless steel plays an important role in the aviation and aerospace industry due to its high strength and toughness. [0003] In order to improve the strength and other properties of martensitic precipitation hardening stainless steel, a lot of research has been carried out in this field. Patent application number 201310276087.0, patent name: precipitation hardening martensitic stainless steel, steam turbine moving b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/06C22C33/04
CPCC22C33/04C22C38/06C22C38/44
Inventor 廖云虎雷德江丁勇黄志永刘永新张华国
Owner SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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