Martensitic stainless steel with high Mn content

A martensitic stainless steel, content technology, applied in the field of martensitic stainless steel, can solve the problems of increasing production cost and increasing the difficulty of production and manufacturing, and achieve the effect of outstanding corrosion resistance, excellent mechanical properties and reduced process flow

Active Publication Date: 2012-03-28
BAOSTEEL DESHENG STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the addition of Ti, Nb, B, W and other elements to this steel type, on the one hand, the production cost is increased, and on the other hand, the difficulty of manufacturing is increased.

Method used

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  • Martensitic stainless steel with high Mn content
  • Martensitic stainless steel with high Mn content

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Experimental program
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Embodiment 1

[0032] Table 1 Similar Patent Steel Composition Control Comparison (Wt%)

[0033] Patent No C Si mn P S Cr Ni Mo Cu Ti Nb CN1697889 0.03-0.1 ≤0.5 1-2.5 — — 10-15 — — — 0.01-0.5 0.01-1.0 Wo2007029626 0.05-0.1 0.1-1.0 0.2-2 ≤0.04 ≤0.01 11-14 0.5-2 1-2 0.5-2 ≤0.1 0.03-0.3 this invention 0.03-0.1 0.2-0.8 1.2-3.0 ≤0.03 ≤0.02 12-14

[0034] Patent No V Zr Al Ta f N CN1697889 0.01-0.5 0.01-1.0 — ≤0.5 ≤0.5 0.005-(Ti+V)×14 / 50+(Nb+Zr)×14 / 90 Wo2007029626 - - ≤0.1 0.01-0.025 this invention 0.008-0.03

[0035] Among them, the 13Cr martensitic stainless steel (WO2007029626) applied by "The Thomson Corporation" adds Ni, Mo, Cu and other elements to improve the plasticity and toughness of the 13Cr martensitic stainless steel, and at the same time, the hardenability is also improved. It uses Ni to expand the high-temperature austenite region, uses Mo...

Embodiment 2

[0040] According to the chemical composition range designed by the present invention, 5 furnaces of steel were smelted on the vacuum induction furnace, which we named as No. 1 furnace, No. 2 furnace, No. 3 furnace, No. 4 furnace, and No. 5 furnace respectively. The chemical composition is shown in Table 2.

[0041] All the 5 furnaces of molten steel were poured into small steel ingots, and the steel ingots were sand-cooled with molds, and demoulded after cooling to room temperature. After demoulding, the surface of the ingot is ground and forged, and finally heated to 1200°C and hot-rolled into a plate. Sample processing is carried out on the plate according to the requirements of the national standard. The steel was annealed at 760°C and quenched at 1000°C respectively, and its strength, hardness, plasticity and corrosion resistance were tested. The corrosion resistance test adopts the salt spray corrosion method, and the corrosion period is 120 hours. The test results are ...

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Abstract

The invention provides a martensitic stainless steel with high Mn content, which comprises the following chemical compositions in percentage by weight: 0.03-0.1% of C, 0.20-0.80% of Si, 1.2-3.0% of Mn, 12-14% of Cr, 0.008-0.03% of N, the balance Fe and unavoidable impurities. By improving Mn content in steel, adding proper amount of N and utilizing Mn and N to strengthen, the invention improves the strength and the rigidity of the martensitic stainless steel. Compared with other alloys, the cost of Mn is lower and the resource is richer. The low-carbon martensitic stainless steel after being strengthened by utilizing Mn and N only needs quenching heat treatment to obtain martensitic stainless steel materials with favorable strength, tenacity and corrosion resistance, and has more convenient use and superior performance compared with commonly used tempered martensitic stainless steel.

Description

technical field [0001] The invention relates to a martensitic stainless steel, in particular to a martensitic stainless steel with high Mn content, high strength, high hardness and high corrosion resistance. Background technique [0002] Martensitic stainless steel is generally used after quenching and tempering heat treatment. The purpose of tempering is to eliminate quenching stress and obtain a stable structure. However, when Cr13 type martensitic stainless steel is tempered at 375-590 °C, there is temper brittleness. After research, this temper brittleness is caused by local overaging of grain boundary carbides. Due to the disadvantages of brittleness, welding, etc., the use of traditional martensitic stainless steel is limited. Therefore, the development of cost-effective high-strength, high-hardness and high-corrosion martensitic stainless steel has become an urgent problem to be solved. [0003] The 13Cr martensitic stainless steel applied by the European "The Thoms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/18C21D1/18
Inventor 翟瑞银程晓波郑宏光常锷张昧茗
Owner BAOSTEEL DESHENG STAINLESS STEEL
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