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6305

סגסוגת זו היא מודיפיקציה לפלדה 4140 אולם עם ריכוז מוליבדן גבוה ותוספת ונדיום. נמצאת בשימוש בטווח עמידות ksi 160-180 (המושג באמצעות טיפול תרמי של °C 594 ), היכן שחוזק גבוה הוא קריטי לדוגמא בצירים של מנועים.

Alloy Steels -> 6305

 

 

General Characteristics 

6305 VAC-ARC alloy steel is a modified 4140 steel with higher molybdenum and a vanadium addition. The alloy steel is generally used in the 160/180,000 psi tensile strength range obtained with an 1100°F temper where good toughness is critical, such as jet engine shafts. It is produced by the consumable electrode vacuum arc remelting process to provide optimum cleanliness and preferred ingot structure.

 

 

Typical chemical composition 

Weight % 

C 

Mn 

Si 

Cr 

Mo 

V 

Fe 

Typical Analysis 

0.44 

0.55 

0.25 

0.95 

0.50 

0.28 

Reminder 

 

 

Physical properties  

Characteristics 

 

English 

Metric 

Nominal density  

(68°F/20°C) 

 

0.283 lbs/in3 

7.84 g/cm3 

Specific heat  

(212 °F/100°C) 

 

0.11 BTU/lb - °F 

460 J/KG- °K 

Coefficient of thermal expansion 

0°F – 200°F 

-18°C – 93°C 

6.30 micro in/in- °F 

11.34 micro m/m- °K 

Thermal conductivity  

 

 

21.7 BTU/ft- hr - °F 

37.5 W/m - °K 

Alloy Steels -> 6305 -> Bar & Tube

 

Mechanical properties 

 

Longitudinal Properties 

Hardness 

 

Ultimate 

Yield 

Elongation  

Reduction of area 

Size Tested & Temperature 

KSI 

MPa 

KSI 

MPa 

% 

% 

13'' x 11'' 

Room Temp' 

162 

1117 

137 

945 

15 

55 

700°F (372°C) 

142 

979 

114 

786 

30 

76.6 

13'' x 11'' 

Room Temp' 

160 

1104 

136 

938 

15 

51.2 

700°F (372°C) 

141 

972 

116 

800 

30 

72.6 

3'' 

Room Temp' 

169 

1166 

136 

938 

18.1 

55.9 

700°F (372°C) 

145 

1000 

118 

813 

25.1 

77.4 

2 5/8'' 

Room Temp' 

164 

1131 

145 

1000 

17.9 

52.4 

700°F (372°C) 

142 

979 

116 

800 

24 

78.4 

2 5/8'' 

Room Temp' 

167 

1151 

140 

965 

18.7 

57.5 

700°F (372°C) 

144 

993 

112 

772 

23.4 

75.9 

2'' 

Room Temp' 

164 

1131 

139 

958 

16.2 

53.3 

700°F (372°C) 

139 

958 

111 

765 

22.3 

75.2 

 
 
 

Specifications

 

·       AMS – 6305, 6304 (Air melt)

·       Military Standards - MIL-S-24502

.

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