Mechanical Engineering - Engineering Materials - Discussion
Discussion Forum : Engineering Materials - Section 2 (Q.No. 10)
10.
18-4-1 high speed steel contains
Discussion:
3 comments Page 1 of 1.
Amol Malode said:
8 years ago
HSS--TCV--18:4:1.
Cobalt HSS--TCCV--20:12:4:2.
Molybdenum HSS--TMCV--6:6:4:2.
Cobalt HSS--TCCV--20:12:4:2.
Molybdenum HSS--TMCV--6:6:4:2.
Sandeep.mule7 said:
9 years ago
VCT = 1 : 4 : 18.
Sagar said:
1 decade ago
High speed steel (HSS) : These are special alloy steel which are obtained by alloying tungsten, Chromium, Vanadium, Cobalt and molybdenum with steel.
HSS has high hot hardness, wear resistance and 3 to 4 times higher cutting speed as compare to carbon steel. Most commonly used HSS have following compositions.
A) 18-4-1 HSS i.e. 18% tungsten, 4% chromium, 1% vanadium with a carbon content of 0.6-0.7%. If vanadium is 2% it becomes 18-4-2 HSS.
B) Cobalt high speed steel: This is also referred to as super high speed steel. Cobalt is added 2 " 15%. The most common composition is tungsten 20%, 4% chromium, 2% vanadium and 12% cobalt.
C) Molybdenum high speed steel: It contains 6% tungsten, 6% molybdenum, 4% chromium and 2% vanadium.
HSS has high hot hardness, wear resistance and 3 to 4 times higher cutting speed as compare to carbon steel. Most commonly used HSS have following compositions.
A) 18-4-1 HSS i.e. 18% tungsten, 4% chromium, 1% vanadium with a carbon content of 0.6-0.7%. If vanadium is 2% it becomes 18-4-2 HSS.
B) Cobalt high speed steel: This is also referred to as super high speed steel. Cobalt is added 2 " 15%. The most common composition is tungsten 20%, 4% chromium, 2% vanadium and 12% cobalt.
C) Molybdenum high speed steel: It contains 6% tungsten, 6% molybdenum, 4% chromium and 2% vanadium.
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