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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极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
