OK 74.78是一款適合焊接低溫應用所用高強度鋼的LMA焊條。其在溫度低至-40°C條件下具有優(yōu)良的缺口韌性。非常適合用于要求硬度達到約250 HV的強制成形焊接和軌道堆焊。OK 74.78極低的藥皮含水量非常適合無法進行預熱的應用。

Typical Tensile Properties

As welded
Elongation	Tensile Strength	Yield Strength	保護氣體	Stress Relieved Temperature	Stress Relieved Testing Time
24 %	650 MPa	600 MPa	ISO	-	-
Stress relieved
Elongation	Tensile Strength	Yield Strength	保護氣體	Stress Relieved Temperature	Stress Relieved Testing Time
-	-	-	AWS	620 °C	1 hr

夏比V型缺口沖擊性能

As welded
Impact Value	Testing Temperature	保護氣體	Stress Relieved Testing Temp	Stress Relieved Testing Time
90 J	-40 °C	ISO	-	-
70 J	-50 °C	ISO	-	-
Stress relieved
Impact Value	Testing Temperature	保護氣體	Stress Relieved Testing Temp	Stress Relieved Testing Time
-	-50 °C	AWS	620 °C	1 hr

焊縫金屬分析

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 %

熔敷數(shù)據(jù)

Fusion time per electrode at 90% I max	kg weld metal/kg electrodes	Number of electrodes/kg weld metal	安培	熔敷率	電壓 V	直徑
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