Economical type duplex stainless steel with phase change plastification effect

Abstract

The invention relates to an economic type duplex stainless steel with a phase change plastification effect, belonging to the technical field of steel and iron alloy materials. The economical type duplex stainless steel comprises the following components in percentage by weight: not more than 0.03 percent of C, not more than 0.03 percent of S, not more than 0.03 percent of P, 19.0-21.0 percent of Cr, 8-12 percent of Mn, 0.1-0.5 percent of Ni, 0.15-0.35 percent of N, not more than 1.0 percent of Si, 0.001-0.01 percent of B, 0.005-0.20 percent of rare earth Ce or Y and the balance of Fe. A conventional melting process method is adopted and comprehensive ingredients are melted, are poured and formed, and are subjected to solution treatment, thus obtaining the economical type duplex stainless steel with quite good phase change plastification effect and elongation.

Description

technical field

[0001] The invention relates to a duplex stainless steel with a particularly good elongation rate of the phase transformation plasticizing effect, which belongs to the technical field of iron and steel alloy materials. Background technique

[0002] Duplex stainless steels consist of austenite and ferrite. The main components of duplex stainless steel are chromium, nickel, and molybdenum. In order to reduce the cost and reduce the content of nickel in the steel, alloying elements such as nitrogen and manganese can be added. With the further continuous growth of domestic stainless steel production capacity and apparent consumption demand, the problems of chromium and molybdenum resources have surfaced and become increasingly prominent. At the same time, there are still contradictions between high strength and poor plasticity in the wide application of economical duplex stainless steel. Its difficulty in thermal processing and low elongation of the thin plate,...

Examples

Embodiment 1

[0010] In this embodiment, the composition and mass percentage of duplex stainless steel are as follows:

[0011] Cr 19.8%

[0012] Ni 0.3%

[0013] Mn 8.5%

[0014] C 0.026%

[0015] Rare earth Ce 0.10%

[0016] N 0.206%

[0017] S 0.004%

[0018] Si 0.5%

[0019] P 0.006%

[0020] B 0.001%

[0021] Fe balance

[0022] The traditional conventional smelting process method is adopted, and the rare earth master alloy is put in before casting. After comprehensive measurement calculation and batching melting, pouring molding, hot forging and cold rolling, and a certain solution treatment, a duplex stainless steel alloy material with TRIP effect is finally obtained, and the tensile fracture strength at room temperature of the material is greater than 850MPa , Yield strength greater than 500MPa, elongation at break greater than 55%.

Embodiment 2

[0024] In this embodiment, the composition and mass percentage of duplex stainless steel are as follows:

[0025] Cr 20.1%

[0026] Ni 0.3%

[0027] Mn 10.2%

[0028] C 0.028%

[0029] Rare earth Ce 0.10%

[0030] N 0.261%

[0031] Si 0.8%

[0032] S 0.002%

[0033] P 0.009%

[0034] B 0.002%

[0035] Fe balance

[0036] The traditional conventional smelting process method is adopted, and the rare earth master alloy is put in before casting. After comprehensive measurement calculation and batch melting, casting, hot forging, cold rolling, and appropriate solution treatment, a duplex stainless steel with TRIP effect is finally produced. Its room temperature tensile breaking strength is greater than 850MPa, and its yield strength is Greater than 500MPa, elongation at break greater than 65%.

Embodiment 3

[0038] In this embodiment, the composition and mass percentage of duplex stainless steel are as follows:

[0039] Cr 20.8%

[0040] Ni 0.3%

[0041] Mn 11.5%

[0042] C 0.021%

[0043] Rare earth Ce 0.10%

[0044] N 0.35%

[0045] Si 0.5%

[0046] S 0.003%

[0047] P 0.007%

[0048] B 0.0015%

[0049] Fe balance

[0050] The traditional conventional smelting process method is adopted, and the rare earth master alloy is put in before casting. After comprehensive measurement calculation and batching melting, pouring molding, hot forging and cold rolling, and then a certain solution treatment, the duplex stainless steel alloy material with TRIP effect is finally obtained, and its room temperature tensile breaking strength is greater than 900MPa, yielding The strength is greater than 500MPa, and the elongation at break is greater than 65%.

[0051] This type of duplex stainless steel material has excellent plasticity and excellent corrosion resistance. It can be use...

technical field

[0001] The invention relates to a duplex stainless steel with a particularly good elongation rate of the phase transformation plasticizing effect, which belongs to the technical field of iron and steel alloy materials. Background technique

[0002] Duplex stainless steels consist of austenite and ferrite. The main components of duplex stainless steel are chromium, nickel, and molybdenum. In order to reduce the cost and reduce the content of nickel in the steel, alloying elements such as nitrogen and manganese can be added. With the further continuous growth of domestic stainless steel production capacity and apparent consumption demand, the problems of chromium and molybdenum resources have surfaced and become increasingly prominent. At the same time, there are still contradictions between high strength and poor plasticity in the wide application of economical duplex stainless steel. Its difficulty in thermal processing and low elongation of the thin plate,...

Examples

Embodiment 1

[0010] In this embodiment, the composition and mass percentage of duplex stainless steel are as follows:

[0011] Cr 19.8%

[0012] Ni 0.3%

[0013] Mn 8.5%

[0014] C 0.026%

[0015] Rare earth Ce 0.10%

[0016] N 0.206%

[0017] S 0.004%

[0018] Si 0.5%

[0019] P 0.006%

[0020] B 0.001%

[0021] Fe balance

[0022] The traditional conventional smelting process method is adopted, and the rare earth master alloy is put in before casting. After comprehensive measurement calculation and batching melting, pouring molding, hot forging and cold rolling, and a certain solution treatment, a duplex stainless steel alloy material with TRIP effect is finally obtained, and the tensile fracture strength at room temperature of the material is greater than 850MPa , Yield strength greater than 500MPa, elongation at break greater than 55%.

Embodiment 2

[0024] In this embodiment, the composition and mass percentage of duplex stainless steel are as follows:

[0025] Cr 20.1%

[0026] Ni 0.3%

[0027] Mn 10.2%

[0028] C 0.028%

[0029] Rare earth Ce 0.10%

[0030] N 0.261%

[0031] Si 0.8%

[0032] S 0.002%

[0033] P 0.009%

[0034] B 0.002%

[0035] Fe balance

[0036] The traditional conventional smelting process method is adopted, and the rare earth master alloy is put in before casting. After comprehensive measurement calculation and batch melting, casting, hot forging, cold rolling, and appropriate solution treatment, a duplex stainless steel with TRIP effect is finally produced. Its room temperature tensile breaking strength is greater than 850MPa, and its yield strength is Greater than 500MPa, elongation at break greater than 65%.

Embodiment 3

[0038] In this embodiment, the composition and mass percentage of duplex stainless steel are as follows:

[0039] Cr 20.8%

[0040] Ni 0.3%

[0041] Mn 11.5%

[0042] C 0.021%

[0043] Rare earth Ce 0.10%

[0044] N 0.35%

[0045] Si 0.5%

[0046] S 0.003%

[0047] P 0.007%

[0048] B 0.0015%

[0049] Fe balance

[0050] The traditional conventional smelting process method is adopted, and the rare earth master alloy is put in before casting. After comprehensive measurement calculation and batching melting, pouring molding, hot forging and cold rolling, and then a certain solution treatment, the duplex stainless steel alloy material with TRIP effect is finally obtained, and its room temperature tensile breaking strength is greater than 900MPa, yielding The strength is greater than 500MPa, and the elongation at break is greater than 65%.

[0051] This type of duplex stainless steel material has excellent plasticity and excellent corrosion resistance. It can be use...