Bearing steel steel series development status at home and abroad

The quality of bearing steel is the most demanding of all the alloy steel and steel grade of inspection items at most. The world recognized the level of bearing steel is a sign of a national level of metallurgy. Along with the rapid development of science and technology, the bearing steel use condition is bad, very demanding of the bearing is proposed. Due to different working environment, working conditions of bearing, in addition to a large number of production of high carbon chromium bearing steel, also developed the carburizing bearing steel, medium carbon steel bearing, stainless bearing steel, high temperature bearing steel and other steel series. High carbon chromium bearing steel is a representative of the bearing steel, steel grade, states have dedicated to technical standards. For example, ISO/FDIS683 - 17, the high carbon chromium bearing steel steel grade: are there cr6, 100, 100 crmnsi4 - 1100 crmnsi6 - 4100 crmnsi6 - 6、100CrMo7、100CrMo7- 3、100CrMo7- 4、100CrMnMoSi8- 4 - 6. In the United States ASTM A295 high carbon chromium bearing steel include: 52100, 5195, UNSK19526, 1070 m, 5160. In addition, the United States for high hardenability of high carbon chromium bearing steel, has a special standard ASTM A485, which include steel grade: Grade1 ~ Grade4 and crmnsi4-100 4100 crmnsi6 - 4100 crmnsi6 - 6、100CrMo7、100CrMo7- 3、100CrMo7- 4、100CrMnMoSi8- 4 - 6. China's high carbon chromium bearing steel ( GB / T18254 - 2002). Including the types of steel are: GCr15, GCr15SiMn, GCr4, GCr15SiMo, GCr18Mo. Carburizing bearing steel surface after carburizing treatment with high hardness and high wear resistance, good toughness and heart is still, can bear larger impact. The highest use temperature of this kind of steel is generally under 200 ℃. This kind of steel production in the United States accounts for about 30% of total production of the bearing steel in China accounts for only about 3%. ISO / FDIS683 - 17, the underlying carburizing bearing steel steel grade 20 cr3,, 20 cr4, 20 mncr4 - 2、17MnCr5、19MnCr5、15CrMo4、20CrMo4、20MnCrMo4- 2、20NiCrMo2、20NiCrMo7、18CrNiMo7- 6、16NiCrMo16- 5. In the United States ASTM A534 carburizing steel standard, in addition to covering the ISO/FDIS683 - 17 all steel grade, include 4118 h, 4320 h, 4620 h, 4720 h, 4817 h, 4820 h, 5120 h, 8617 h, 8620 h and 9310 h. Chinese standard GB/T3203 - carburizing bearing steel Steel grade are: of the 82 G20CrMo, G20CrNiMo, G20CrNi2Mo, G20Cr2Ni4, G10CrNi3Mo, G20Cr2Mn2Mo. G20CrMo steel after carburizing, quenching, tempering, surface layer with high hardness and wear resistance, bearing material basic requirements. The core hardness is arriving, good toughness, suitable for making parts by impact load. Also has high heat intensity. Its 4118 h phase approximation with the United States. G20CrNiMo steel after carburizing and carbonitriding has obvious superior to the contact fatigue life of GCr15 steel, the surface wear resistance close to GCr15 steel. Heart have enough toughness. The steel has good hardenability. It is making good impact resistance load bearing steel, it is close to 8620 h in the United States. Sclerosing G20CrNi2Mo steel with medium surface, it is higher than G20CrNiMo steel has better hardenability and the comprehensive mechanical properties. Applicable to the production of railway train rolling bearing ring, also can produce automobile gear. It is close to 4320 h in the United States. G20Cr2Ni4 table after carburizing steel