Answer Posted / nitian

along with the thickness,diameter the dencity of the steel pipe is also required to calculate the weight of the pipe per meter followed by cost per kg.

What is a boring tool ?

1134

---

Discuss steam engines. What is its overall efficiency ?

992

---

Why we are doing post heating in alloy steel welding?

1092

---

What is Redlich Kwong equation?

1031

---

I currently use 17-7 PH stainless which is hardened to condition CH after forming. raw matl is .1.75"X .12" X .008". Its main usage after hardening is silicon wafer retainer where it's contantly cycled up and down to putin and remove wafer after 40-60 sec process at 400C temp. At this high temperature this part seemed to deform after a a couple of hundred wafer which is what it was designed for in the first place. THere is a proposal to go to a different material to increase lifeline of this part. My question is..... can 321 SST be a plugin replacement. I know this has a higher temp rating but how about its forming characteristics, will it have spring properties, and wont become brittle after prolonged exposure to 400C.

2389

---

Which pump is preferred for small discharge at high pressure?

1067

---

How much gold concentration should be in the organic phase (dbc) before reduction by oxalic acid solution? Is it effective on purity of gold in reduction step? Whatis the ratio of dbc to oxalic acid solution in this step?

1030

---

what is the hardness of ohns before heat treatment process and hardness of en series before heat treatment process

937

---

What is galvanising?

966

---

Give example of heterogeneous systems.

1015

---

What is the usgae of angle plate ?

1069

---

How can you separate gold from mercury?

1008

---

Define what is the strongest metal?

973

---

How one can differentiate between 304 & 316 grades of steel (physically)?

907

---

In welding, arc is too long due to ?

1029

---