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Engineering Materials

Engineering Materials
Maximum percentage of carbon in austenite is

0.017
0.008
0.0026
0.00025

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Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 65
RC 80
RC 57
RC 48

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Engineering Materials
1841 high speed steel contains

None of these
Vanadium 18%, chromium 1% and tungsten 4%
Vanadium 4%, chromium 18% and tungsten 1%
Vanadium 1%, chromium 4% and tungsten 18%

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Engineering Materials
Gamma-iron occurs between the temperature ranges of

900°C to 1400°C
600°C to 900°C
1400°C to 1530°C
400°C to 600°C

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Engineering Materials
Tensile strength of steel can be safely increased by

Adding small quantities of copper
Adding carbon up to 6.3%
Adding carbon up to 0.83%
Adding carbon up to 2.8%

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Engineering Materials
The presence of hydrogen in steel causes

Improved Weldability
Reduced neutron absorption cross-section
Embrittlement
Corrosion resistance

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