True or False 23. The last two digits of the SAE designation of steel represent

Question

True or False 23. The last two digits of the SAE designation of steel represent the carbon content? 24. Hot Finish hardening technique allows for the steel to be more stable for machining True or False 25. The primary factors that control the weldability of metals are chemical composition, comp of filler metal and 26. The range of carbon content in tool steels is A) 1-3% B)0-3% 00.30-1% Dione of these 27. All metals, in addition to strengthening by alloying can be strengthen by 28. Manganese is what kind of steel? 29. The relative ease of shaping or forming metals is called 30. A term applied to metal peoducts that are brought to their final shape by a room temperature rolling process is 3). A material which is coemprised of atoms held together by a matrix of electrons is a 2. The smallest unit of matter, which can exist by itself and retain all the properties of the original substance, is called 33. Which of the following is a compound? A) Boron B) Ammonia C) Carbon D) Air 34. What is a metal? 35. Which of the following hardness designations conforms to consensus standards? A] 60 HRc B 315 Brinneli Harhess cpi Rockwell C DI 315 BH 36 The sum of the atomie weights of all atoms in a molecule is called the 37. What is the purpose of tempering after quench hardening? 38. In tool steels what is added to increase wear resistance? 39. Graph showing phase relationships that occur in a metal alloy as it cools from molten state A) Heat diagram B) IT diagram C) Phase diagram D) none of these A) Soft, ductile, magnetic B) Soft moderate strength, nonmagnetie C) Hard and britle cooling it by submersing it in a bath of oil is called 40. In the principal stable phases of steel the Austenite phase or hardening is to heat the material to a specific temperature & then 41. Part of the requirement f

Explanation / Answer

23) True

The last two digits in SAE indicate that the carbon concentration example SAE 1018 indicates non-modified carbon steel containing 0.18% of carbon.

24)True

25) Primary factors are

a) Chemical Composition

b)Filler metal

c)Welding speed

d) Cooling rate and

e)Shielding gases

26) Correct answer is either Option B or None of the above

Tool sgteel has carbon content between 0.5% and 1.5%, tool steels are manufactured under carefully controlled conditions to produce the required quality.

27) Along with Alloying we can uses Heat Treatment process like Work hardening to strengthen the metals

28)Hadfield steel

manganese steel or Hadfield steel, is a steel alloy containing an average of around 13% manganese.

29) Workability of formability

The ability of metal indicating the ease with which it can chnages its shape while in its solid state is called as workability of formability

As per Chegg Guidlines I have answered only first four parts of the Questions

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