Characteristics:  ( 1 ) The product is 1.25Cr0.5Mo Cr-Mo steel MIG welding wire. ( 2 ) It’s used to weld similar content alloy steel, such as boiler pipe, high pressure vessel, oil refining equipment ,etc. Precautions: ( 1 ) Adequately clear the oil,rust,moisture,dust and other debris of the welded parts. ( 2 ) The hardening capacity of molten metal is strong in air-cool,it need preheat before welding and heat treatment after welding. ( 3 ) Preheat and interpass temperature in 135~165℃,heat treatment after welding in 675~705℃.