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Austenitic heat-resistant steel without peeling on the surface and its manufacturing method

A technology for austenitic heat-resistant steel and a manufacturing method, applied in the field of austenitic heat-resistant steel and its manufacturing, can solve the problems of material scrap, scale defects, peeling defects, etc., so as to prevent surface peeling and improve high temperature Oxidation resistance, effect of reducing production cost

Active Publication Date: 2022-03-15
BAOSTEEL DESHENG STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the high nickel content makes the molten steel solidify in the full austenite solidification mode, and a large number of solidification microcracks are generated when the surface of the slab or ingot is solidified, and are oxidized along the microcrack channels during the subsequent heating process, resulting in Severe stripe defects appear on the surface, which is often referred to as peeling defects, such as figure 1 As shown, such defects often lead to the scrapping of entire batches of materials

Method used

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  • Austenitic heat-resistant steel without peeling on the surface and its manufacturing method
  • Austenitic heat-resistant steel without peeling on the surface and its manufacturing method
  • Austenitic heat-resistant steel without peeling on the surface and its manufacturing method

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Embodiment

[0044]Pour the molten steel smelted by the electric furnace and AOD furnace into the baked ladle, lift it to the refining process to fine-tune the composition, ensure that the chromium-nickel equivalent ratio (Cred / Nieq) is greater than 1.3, and ensure that the ladle temperature reaches When the required temperature is cast, it is hoisted to the continuous casting platform and cast into a slab with a thickness of 200mm. In order to ensure the surface quality of the continuous casting slab, try to ensure a stable casting speed, and slowly reduce the casting speed until the last 10 minutes. The chemical composition of the slab is shown in Table 1.

[0045] Send the cast slab to the walking beam heating furnace for heating, control the air-fuel ratio in the heating furnace to <9.8, and make the residual oxygen in the heating furnace <2%; After rolling and cold rolling, annealing and pickling, the finished product with the required target thickness is prepared. The key process pa...

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Abstract

A surface-free austenitic heat-resistant steel and a manufacturing method thereof, the chemical composition mass percent of the steel is: C: 0.03-0.08%, Si: 1.5-2.5%, 0<Mn≤2.0%, Cr: 19.0 ~21.0%, Ni: 11.0~13.0%, N: 0.04~0.08%, Mo: 0.6~1.2%, Zr: 0.001~0.01%, P≤0.040%, S≤0.03%, the rest is Fe and unavoidable impurities Elements, and need to meet: 30%≤(Cr+Ni)≤34%, 1.3≤(Creq / Nieq)≤1.8. The austenitic heat-resistant steel produced by the invention has good surface quality, no peeling defects, excellent oxidation resistance and good high-temperature strength, and the specific performance indicators are as follows: at 900°C: the oxidation rate is 0.1-0.5g / m 2 h, yield strength ≥ 69MPa, tensile strength ≥ 88MPa.

Description

technical field [0001] The invention relates to a surface-free austenitic heat-resistant steel and a manufacturing method thereof. Background technique [0002] Heat-resistant steels serving under high temperature conditions should have good high temperature oxidation resistance, high temperature strength, high temperature creep properties and good surface quality. [0003] Traditional heat-resistant steel has two common defects. The first is that there are many alloy elements, especially the chromium content is greater than 20%, the nickel content is greater than 20%, and the sum of chromium + nickel content is greater than 40%. The second is that there are many types of alloys. . These two common points lead to an extremely low yield when industrially producing heat-resistant steel. Because of the high alloy content, the fluidity of the molten steel is poor, and the inclusions are not easy to float, especially when the oxidizable element Ti or rare earth is contained, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/44C22C38/50C21D8/02
CPCC21D8/0226C21D8/0247C22C38/001C22C38/02C22C38/04C22C38/44C22C38/50C22C38/58C21D2211/001
Inventor 黄俊霞毕洪运李实魏文杰常锷
Owner BAOSTEEL DESHENG STAINLESS STEEL
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