Molybdenum containing stainless steel welding rod steel and preparing method thereof

A technology of stainless steel and welding rod steel, which is applied in the direction of electric furnace, furnace, process efficiency improvement, etc. It can solve the problems of poor high-temperature plasticity, low yield, and poor surface quality of materials, achieve good drawing performance, overcome easy overacid, The effect of increasing stability

Active Publication Date: 2019-05-31
宝钢特钢长材有限公司
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Problems solved by technology

However, when the content of molybdenum is high, the high temperature plasticity of the material is poor, the thermal deformation temperature range is narrow, and the plasticity drops sharply when the temperature is lower than 1000 ° C. The processing is very difficult. There are few domestic and foreign manufacturers. Small rolling mills roll wire rods with small coil weight, low yield and poor surface quality

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  • Molybdenum containing stainless steel welding rod steel and preparing method thereof
  • Molybdenum containing stainless steel welding rod steel and preparing method thereof
  • Molybdenum containing stainless steel welding rod steel and preparing method thereof

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Embodiment Construction

[0026] Design principle of the present invention is as follows:

[0027] When the content of molybdenum is high, it is easy to produce 6 intermediate phases in austenitic stainless steel. 6 phases are a brittle and hard secondary phase. Chromium and molybdenum can improve the precipitation behavior of 6 phases at high temperatures, which is unfavorable to the mechanical properties of stainless steel. The influence of plasticity and toughness will decrease. Generally, the ferrite content of 309 is between 8% and 12%, and the ferrite content of 309Mo reaches about 25% (see figure 1 ), in the process of thermal deformation, the austenite and ferrite phases have obvious differences in strength due to the difference in lattice structure and solid solution elements. During thermal deformation, stress concentration is formed at the phase boundary between the two phases and cracks are likely to occur. The thermoplasticity of this steel is poor, and the deformation temperature range i...

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Abstract

The invention discloses molybdenum containing stainless steel welding rod steel. The molybdenum containing stainless steel welding rod steel comprises, by weight percent, smaller than or equal to 0.03% of C, 0.45%-0.65% of Si, 1.5%-2.5% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.002% of S, 13.0%-14.0% of Ni, 23.0%-25.0% of Cr, 2.0%-3.0% of Mo, smaller than or equal to 0.5% of Cu, smaller than or equal to 0.07% of N and the balance iron and inevitable impurities. The invention further discloses a preparing method of the molybdenum containing stainless steel welding rod steel. Through the component optimization design and technology improvement, 309 Mo stainless steel welding rod steel which is qualified in quality and stable can be produced in batches, wherein the ferrite content is high (25%).

Description

technical field [0001] The invention relates to welding rod steel technology, more specifically to a molybdenum-containing stainless steel welding rod steel and a preparation method thereof. Background technique [0002] 309Mo is a high-end stainless steel welding material. It is mainly used for welding the same type of stainless steel containers, composite plates, dissimilar steels, etc. that are resistant to sulfuric acid medium corrosion. It is a high content of molybdenum added to ordinary 309 stainless steel welding. The higher the molybdenum content, the higher the ferrite of the steel grade, which can ensure the formation of a certain amount of δ ferrite in the weld structure during welding. In addition, the delta ferrite in the weld structure is distributed in the grain boundaries of austenite grains, which can block the grain boundary channels and reduce grain boundary corrosion. It is a stainless steel welding material with excellent welding performance . However...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/42C22C38/44C22C38/58C22C33/04C21C5/52C21D8/06
CPCY02P10/20
Inventor 臧震周灿栋敖影王和宝沈宗燕邵健翔
Owner 宝钢特钢长材有限公司
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