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[Stainless steel bearings] Why is there a small amount of magnetism?

Release time: 2019-09-06 11:01:45 Views: 373

          般来说,奥氏体是无磁或弱磁性,而马氏体或铁素体是带磁性的,由于冶炼或者锻压时成分偏析或热处理不当,会造成奥氏体不锈钢中含有少量马氏体或铁素体组织。 Generally speaking, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to component segregation or improper heat treatment during smelting or forging, a small amount of martensite will be contained in austenitic stainless steel. Body or ferrite. In this way, austenitic stainless steel will have weak magnetic properties. 上海御微轴承

          In addition, the austenitic stainless steel undergoes cold working, and the structure will also be transformed to martensite. The greater the degree of cold working deformation, the more martensite transformation, and the greater the magnetic properties of the steel. 6cm的钢管,无明显磁感,生产直径2cm的钢管,因冷弯变形较大磁感就明显一些,生产方矩形管因变形量比圆管大,特别是折角部分,变形更激烈磁性更明显,同样的原理,原本无磁性的304不锈钢板在制做水槽的冷拉伸工艺处理中,就有磁性的产生,在水槽中体现较明显的位置就是折角部位,也就是变形度最大的部位。 Like a batch of steel strips, the production of steel pipes with a diameter of 6cm has no obvious magnetic induction. For the production of steel pipes with a diameter of 2cm, the magnetic induction is obvious due to the large deformation of the cold bend. The square rectangular pipe has a larger deformation than the round pipe, especially In the corner, the deformation is more intense and the magnetic is more obvious. In the same principle, the original non-magnetic 304 stainless steel plate has magnetism in the cold drawing process of the sink. The obvious position in the sink is the corner. , That is, the part with the largest degree of deformation.

The materials of general stainless steel bearings are as follows;

SUS420(3Cr13) First, SUS420 (3Cr13)
  420 stainless steel is a martensitic stainless steel with certain wear resistance, corrosion resistance and high hardness. It is suitable for various types of bearings, precision machinery, electrical, equipment, instruments, meters, transportation tools, household appliances, etc. It is mostly used to manufacture parts that are resistant to atmospheric, water vapor, water and oxidizing acid corrosion. It is widely used in the bearing field.
SUS440(9Cr18) 、SUS440C(9Cr18Mo) Second, SUS440 (9Cr18), SUS440C (9Cr18Mo)
cr13钢高,所以强度,硬度比cr13钢高,其他性能与cr13相似,但焊接性差,耐蚀性和韧性都很强,在微小型轴承和轴承要转速较高领域使用特别广泛。 Martensitic stainless steel has higher carbon content than cr13 steel, so its strength and hardness are higher than cr13 steel. Other properties are similar to cr13, but it has poor weldability, corrosion resistance and toughness. The field is particularly widely used.
SUS630不锈钢 Third, SUS630 stainless steel
630 stainless steel is a martensitic precipitation hardening stainless steel. 630 stainless steel has good attenuation performance, strong resistance to corrosion fatigue and water droplets. Corrosion resistance is equivalent to 304 stainless steel, and its hardness is better than 304 stainless steel. It is suitable for food industry, offshore platform, paper industry, medical equipment, water washing equipment, environmental protection cleaning machinery, chemical machinery, and widely used in industries with high requirements for prevention.
SUS304(06Cr19Ni10/0Cr18Ni9) Fourth, SUS304 (06Cr19Ni10 / 0Cr18Ni9)
304 austenitic stainless steel has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good hot workability such as stamping and bending, no thermal external hardening phenomenon, non-magnetic 304 (weak magnetic after processing) stainless steel. Heat resistance, and widely used in making corrosion-resistant and moldable equipment and parts. At present, 304 stainless steel bearings are widely used in food processing machinery, chemical machinery, marine equipment, medical equipment, water washing equipment, environmental protection cleaning machinery, and are widely used in industries with high rust prevention.
SUS316(0Cr17Ni12Mo2) Fourth, SUS316 (0Cr17Ni12Mo2)
316 austenitic stainless steel has good plasticity, toughness, cold degeneration, good welding process performance, good appearance gloss of cold rolled products; due to the addition of Mo (2-3%), the corrosion resistance and especially the pitting resistance are particularly excellent. Bearings required for strong acid and alkali environments.

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Shanghai Yuwei Bearing Co., Ltd. (Headquarters)
Phone: 021-51099639
Fax: 021-51861291
Enterprise email: yw@gifudayo.com
Address: 2758 Songjin Road, Zhangyan Town, Jinshan District, Shanghai, China
Shaanxi Yuwei Bearing Manufacturing Co., Ltd.
Phone: 029-86696506
Fax: 029-89503160
Enterprise email: sales@gifudayo.com
Address: Qinhan New City Free Trade Zone, Xixian New District, Shaanxi Province
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