前言随着我国国防工业、石油化学工业的飞跃发展,在深冷设备和制冷工程上对低温用钢的需要量日益增加;对焊接材料的需要量也日益增加。国外在-100℃下用钢多为不锈钢,焊接材料也为不锈钢奥氏体焊条。近几年来,日本也在研制3.5～5.0％Ni低温钢,焊接材料也在研制含镍量3.5～5.0％的低镍焊条。但焊后要经过适当热处理。 Preface With the rapid development of China’s defense industry and petrochemical industry, the demand for cryogenic steel for cryogenic equipment and refrigeration engineering is on the rise. The demand for welding materials is also on the increase. Foreign at -100 ℃ mostly stainless steel, stainless steel welding materials are austenitic electrode. In recent years, Japan is also developing 3.5 ~ 5.0% Ni cryogenic steel, welding materials are also developed nickel nickel content of 3.5 ~ 5.0% of low nickel electrode. But after welding to go through appropriate heat treatment.