OK 74.78伊萨焊材

OK 74.78是一款适合焊接低温应用所用高强度钢的LMA焊条。其在温度低至-40°C条件下具有优良的缺口韧性。非常适合用于要求硬度达到约250 HV的强制成形焊接和轨道堆焊。OK 74.78较低的药皮含水量非常适合无法进行预热的应用。Typical Tensile Properties
As welded
Elongation	Tensile Strength	Yield Strength	保护气体	Stress Relieved Temperature	Stress Relieved Testing Time
24 %	650 MPa	600 MPa	ISO	-	-
Stress relieved
Elongation	Tensile Strength	Yield Strength	保护气体	Stress Relieved Temperature	Stress Relieved Testing Time
-	-	-	AWS	620 °C	1 hr

夏比V型缺口冲击性能
As welded
Impact Value	Testing Temperature	保护气体	Stress Relieved Testing Temp	Stress Relieved Testing Time
90 J	-40 °C	ISO	-	-
70 J	-50 °C	ISO	-	-
Stress relieved
Impact Value	Testing Temperature	保护气体	Stress Relieved Testing Temp	Stress Relieved Testing Time
-	-50 °C	AWS	620 °C	1 hr

焊缝金属分析
Mn
Mn	Mo	C	Si	Ni	Cr
1.60 %	-	-	-	-	-
Mo
Mn	Mo	C	Si	Ni	Cr
-	0.35 %	-	-	-	-
C
Mn	Mo	C	Si	Ni	Cr
-	-	0.05 %	-	-	-
Si
Mn	Mo	C	Si	Ni	Cr
-	-	-	0.35 %	-	-
Ni
Mn	Mo	C	Si	Ni	Cr
-	-	-	-	0.03 %	-
Cr
Mn	Mo	C	Si	Ni	Cr
-	-	-	-	-	0.03 %

熔敷数据
Fusion time per electrode at 90% I max	kg weld metal/kg electrodes	Number of electrodes/kg weld metal	安培	熔敷率	电压 V	直径
55 sec	0.62 kg	73.0	75-100 A	0.90 kg/h	22 V	2.5 x 350 mm
86 sec	0.65 kg	32.0	105-140 A	1.30 kg/h	23 V	3.2 x 450 mm
97 sec	0.65 kg	20.5	140-190 A	1.80 kg/h	23 V	4.0 x 450 mm
100 sec	0.68 kg	14.0	190-260 A	2.60 kg/h	24 V	5.0 x 450 mm
103 sec	0.69 kg	10	240-340 A	3.6 kg/h	24 V	6.0 x 450 mm